Blade rubber and vehicle wiper device

The present invention relates to a blade rubber and a vehicle wiper device.

Conventionally, a wiper blade for a vehicle wiper device includes a lever member and a blade rubber having an elongate shape. The blade rubber includes a basal portion, which is gripped by the lever member and a wiping portion, which extends downward from the basal portion to wipe a wiped surface.

A common blade rubber includes a neck portion located between a basal portion and a wiping portion. In an unloaded state, the neck portion extends in a downward hanging direction perpendicular to a width direction. During a wiping operation, the neck portion bends so that the wiping portion inclines downward and toward an opposite side of a travelling direction. The wiping portion slidably contacts a wiped surface in an inclined posture and wipes the wiped surface. When this blade rubber is in a reversing operation, the wiping portion changes its extending direction to cross over the downward hanging direction so that the wiping portion extends toward a different side, while the blade rubber rapidly moves upward and downward. This generates an impact noise, i.e., a reversing operation noise.

For example, Japanese Laid-Open Patent Publication 2001-322535 discloses a wiping portion, which includes a hollow portion extending in a longitudinal direction and projecting portions, which project toward two opposite sides in a width direction. This structure is directed to prevent a generation of the reversing operation noise.

However, the blade rubber described above increases rigidity in the wiping portion in an up/down direction, and is not likely to be deformed elastically in the up/down direction. This may lower the ability of the blade rubber to follow a curved wiped surface and lower the wiping ability.

The objective of the present invention is to provide a blade rubber and a vehicle wiper device capable of reducing a reversing operation noise while maintaining the wiping ability.

To achieve the foregoing objective, a blade rubber having an elongate shape and extending along a longitudinal direction includes a basal portion and a wiping portion. The basal portion is retained by a rubber holder. The wiping portion extends downward from the basal portion. The wiping portion slidably contacts and wipes a wiped surface along a width direction. The wiping portion has a cross-sectional shape, which inclines with respect to a downward hanging direction when the blade rubber is in an unloaded state. The cross-sectional shape is a shape of a cross-sectional surface of the wiping portion. The cross-sectional surface extends along a direction perpendicular to the longitudinal direction. The downward hanging direction is a direction, which extends along a direction perpendicular to the longitudinal direction and the width direction.

The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:

FIG. 1 is a side elevation view of a vehicle wiper according to one embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of the vehicle wiper in FIG. 1 ;

FIG. 3 is a schematic view for explaining a method of manufacturing a blade rubber in FIG. 2 ;

FIGS. 4A and 4B are schematic views for explaining an operation of a forward moving operation of the vehicle wiper in FIG. 2 ;

FIGS. 5A and 5B are schematic views for explaining an operation of a backward moving operation of the vehicle wiper in FIG. 2 ;

FIG. 6 is a schematic view showing a blade rubber in another example as viewed in a longitudinal direction;

FIG. 7 is a schematic view showing a blade rubber in another example as viewed in a longitudinal direction;

FIG. 8 is a schematic view showing a blade rubber in another example as viewed in a longitudinal direction;

FIG. 9 is a schematic view showing a blade rubber in another example as viewed in a longitudinal direction;

FIG. 10 is a schematic view showing a blade rubber in another example as viewed in a longitudinal direction;

FIG. 11 is a schematic view for explaining a method for manufacturing a blade rubber in another example;

FIG. 12A is a perspective view showing a wiper arm in another example;

FIG. 12B is a schematic view of a wiper blade in another example;

FIG. 13 is a cross-sectional view of a vehicle wiper in another example;

FIG. 14 is a cross-sectional view of a vehicle wiper in another example;

FIG. 15 is a cross-sectional view of a vehicle wiper in another example;

FIG. 16 is a cross-sectional view of a vehicle wiper in another example;

FIG. 17 is a cross-sectional view of a vehicle wiper in another example; and

FIG. 18 is a cross-sectional view of a vehicle wiper in another example.

Hereafter, discussion will be made on one embodiment of a vehicle wiper device according to FIGS. 1 to 5 .

As shown in FIG. 1 , a vehicle wiper of a vehicle wiper device includes a wiper arm 1 and a wiper blade 2 , which connects with the wiper arm 1 . As shown in FIG. 4 , the vehicle wiper device according to this embodiment is used to wipe rain drops or the like on a front windshield G serving as a wiped surface of a vehicle. A stop position of the vehicle wiper device is set at a lower end of the front windshield G. The vehicle wiper device extends substantially along a lower side of the front windshield G when positioned at the stop position.

The wiper arm 1 includes an arm head 3 , a retainer 4 and an arm piece 5 . The arm head 3 has a basal end fixed with a pivot shaft (not shown), which is pivotally moved by a wiper motor (not shown) in back and forth within a predetermined angle range. The retainer 4 connects with a distal end of the arm head 3 to be pivotally moved. The retainer 4 has a distal end, which is biased by a biasing mechanism towards the front windshield G. The distal end of the retainer 4 is fixed with the arm piece 5 . The wiper blade 2 is connected with a distal end part of the arm piece 5 to be pivotally moved.

The wiper blade 2 includes a lever assembly 9 serving as a rubber holder. The lever assembly 9 includes a primary lever 6 , one pair of secondary levers 7 and two pairs of yokes 8 . The primary lever 6 connects with the wiper arm 1 (arm piece 5 ) to be pivotally moved. The secondary levers 7 connect with two opposite ends of the primary lever 6 , respectively, to be pivotally moved. The yokes 8 connect with two opposite ends of each of the secondary lever 7 , respectively, to be pivotally moved. Each yoke 8 includes gripping portions 8 a arranged at two opposite ends of the yoke 8 .

As shown in FIGS. 1 and 2 , the wiper blade 2 includes a blade rubber 10 , which has an elongate shape and a pair of backings 11 . A plurality of gripping portions 8 a grip the blade rubber 10 at a plurality of portions (eight portions in this embodiment) in a longitudinal direction. The pair of backings 11 are attached to the blade rubber 10 .

The blade rubber 10 includes a basal portion 10 a and a wiping portion 10 b . The basal portion 10 a is gripped by the gripping portions 8 a . The wiping portion 10 b extends downward (extends toward the front windshield G when mounted on the vehicle) from the basal portion 10 a . The wiping portion 10 b slidably contacts and wipes the front windshield G along a width direction (directions along forward and backward moving operations in FIG. 2 ).

FIG. 2 shows a cross-section of the vehicle wiper that is perpendicular to the longitudinal direction. The basal portion 10 a is formed with backing accommodation grooves 10 c and gripped grooves 10 d , which extend along the longitudinal direction. The backing accommodation groove 10 c is arranged at a part of the basal portion 10 a that is located at a center in an up/down direction and located at two opposite ends in the width direction of the basal portion 10 a . Each gripped groove 10 d is arranged at a portion located below each of the backing accommodation grooves 10 c arranged at two opposite ends of the basal portion 10 a in the width direction. The backing accommodation groove 10 c accommodates the backing 11 , which is made of a metal and applies rigidity and elasticity to the blade rubber 10 . A distal end of the gripping portion 8 a fits in the gripped groove 10 d . The gripping portion 8 a grips the basal portion 10 a and the backing 11 .

As shown in FIG. 2 , the wiping portion 10 b has an elongate plate shape extending along the longitudinal direction of the blade rubber 10 . The wiping portion 10 b has a cross-sectional shape, which inclines with respect to a downward hanging direction (downward direction in FIG. 2 ) when the blade rubber 10 is in an unloaded state. The cross-sectional shape refers to a shape of a cross-section of the wiping portion 10 b that extends in a direction perpendicular to the longitudinal direction. The downward hanging direction refers to a direction extending along a direction perpendicular to the longitudinal direction and the width direction. In one embodiment of the present invention, the downward hanging direction is a same direction as the above-described up/down direction.

In other words, an inclination direction of the wiping portion 10 b inclines with respect to the downward hanging direction when the blade rubber 10 is in the unloaded state. The inclination direction of the wiping portion 10 b refers to an extending direction of the wiping portion 10 b , which extends from a contacting position between the front windshield G and the wiping portion 10 b toward the basal portion 10 a.

The wiping portion 10 b is configured so that the inclination direction of the wiping portion 10 b does not cross over the downward hanging direction during a wiping operation of the wiper arm 1 that includes a reversing operation according to the pivotal movement of the wiper arm 1 in back and forth. In other words, the extending direction of the wiping portion 10 b is maintained to direct one side so that the extending direction does not cross over the downward hanging direction to incline toward the other side. That is, an inclination angle between the extending direction and the inclination direction of is set to be between 0° to 90° during the wiping operation of the wiping portion 10 b that includes a reversing operation. This configuration is determined, for example, by actually carrying out the wiping operation on the front windshield G, which is in a normal state on which a large object is not adhered, or by a calculation taking into consideration a biasing force (a pushing force) by the biasing mechanism and a friction resistance.

The wiping portion 10 b inclines to extend downward and toward the opposite side of a starting direction (a rightward direction in FIG. 2 ) of the blade rubber 42 from the stop position at the time of starting the wiping. The wiping portion 10 b according to this embodiment projects from an end part of the basal portion 10 a that is located at the starting direction side (a right side in FIG. 2 ) of the basal portion 10 a.

The wiping portion 10 b includes a distal end inclined portion 10 e , which is arranged at a lower end part of the wiping portion 10 b . An inclination direction of the distal end inclined portion 10 e is closer to the downward hanging direction (a downward direction in FIG. 2 ) than the inclination direction of an upper part of the wiping portion 10 b . In other words, an angle formed between the inclination direction of the distal end inclined portion 10 e and the downward hanging direction is smaller than an angle formed between the inclination direction of the upper part of the wiping portion 10 b and the downward hanging direction. The distal end inclined portion 10 e inclines so that an angle (θ2), which is less than 45° is formed between the inclination direction of the distal end inclined portion 10 e and the downward hanging direction (the downward direction in FIG. 2 ) in the unloaded state. The upper part of the wiping portion 10 b with respect to the distal end inclined portion 10 e inclines so that an angle, which is greater than or equal to 45° is formed between the inclination direction of the upper part of the wiping portion 10 b and the downward hanging direction (the downward direction in FIG. 2 ) in the unloaded state.

The wiping portion 10 b includes a distal end portion. In this embodiment, the distal end inclined portion 10 e corresponds to the distal end portion. The distal end portion has a width, which become narrower toward the front windshield G. This width is defined by a first surface 10 m , which is located at a preceding side of the wiping portion 10 b in a traveling direction during the forward moving operation, and a second surface 10 n , which is located at a preceding side of the wiping portion 10 b in a traveling direction during the backward moving operation. As shown in FIG. 4A , during the forward moving operation, a first angle θz is formed between the first surface 10 m and a part of the front windshield G that is located at a preceding side in a traveling direction with respect to the wiping portion 10 b . As shown in FIG. 5A , during the backward moving operation, a second angle θz is formed between the second surface 10 n and a part of the front windshield G that is located at a preceding side in a traveling direction with respect to the wiping portion 10 b . The first angle θz is substantially the same as the second angle θz. The angle θz is a contacting angle of the distal end of the wiping portion 10 b with respect to the part of the front windshield G in the traveling direction.

As shown in FIG. 2 , when viewing the wiping portion 10 b in the longitudinal direction, an angle θ1, which is less than 90°, is formed between two opposite side surfaces of the distal end part of the wiping portion 10 b . An angle θ2 is formed between the downward hanging direction and the first surface 10 m , which is located at a forward moving operation side (right side in FIG. 2 ). An angle θ3 is formed between the downward hanging direction and the second surface 10 n , which is located at a backward moving operation side (left side in FIG. 2 ). The angle θ2 is smaller than the angle θ3 in the unloaded state. That is, the wiping portion 10 b tilts larger during the forward moving operation than when the blade rubber 10 is in the unloaded state so that the inclination angle with respect to the downward hanging direction increases. In other words, the angle θ2 increases while the angle θ3 decreases. This moves the basal portion 10 a downward. The wiping portion 10 b rises by a small amount during the backward moving operation so that the inclination direction approaches the downward hanging direction. In other words, the angle θ2 decreases while the angle θ3 increases. This moves the basal portion 10 a upward.

Taking into consideration with the above, the angle θ2 and the angle θ3 are set so that the angle θz is constant between the front windshield G and a part of the distal end of the wiping portion 10 b that is located at the preceding side in the traveling direction both during the forward moving operation and during the backward moving operation. This setting is determined, for example, by actually carrying out the wiping operation on the front windshield G, which is in a normal state on which a large object is not adhered, or by a calculation taking into consideration a biasing force (a pushing force) by the biasing mechanism and a friction resistance.

As shown in FIG. 3 , the blade rubber 10 is manufactured by a press forming using a lower die 21 and an upper die 22 . The press forming is carried out to manufacture a pressed part, which has a shape in which two distal ends of two wiping portions 10 b of two blade rubbers 10 have been connected to each other. Subsequently, the pressed part is cut into two parts along a chain double-dashed line shown in FIG. 3 so that the angle θ1 is formed.

Next, operation of the vehicle wiper device configured as discussed above will be explained.

When the wiper motor is initiated, the wiper blade 2 located at the stop position (lower end of the front windshield G) starts the forward and backward moving operations. The wiping portion 10 b tilts further with respect to the downward hanging direction so that the basal portion 10 a moves downward by a small amount. In this state, the distal end of the wiping portion 10 b slidably contacts the front windshield G to wipe the front windshield G.

As shown in FIG. 4A , during the forward moving operation, a small object X, such as bird droppings may be adhered on the front windshield G, for example. When the wiping portion 10 b travels over the small object X, the distal end of the wiping portion 10 b moves so as to be pulled obliquely upward and toward the basal portion. Accordingly, as shown in FIG. 4B , the distal end of the wiping portion 10 b slides on and easily travels over the object X.

When the wiper blade 2 reaches the reversing position, the wiper blade 2 reverses the moving direction and starts the backward moving operation. The wiping portion 10 b rises by a small amount so as to approach the downward hanging direction. This moves the basal portion 10 a upward by a small amount. In this state, the distal end of the wiping portion 10 b slidably contacts the front windshield G to wipe the front windshield G.

As shown in FIG. 5A , during the backward moving operation, when the wiping portion 10 b contacts the object X, the distal end of the wiping portion 10 b is pushed and moves obliquely upward and toward the basal portion side. As shown in FIG. 5B , when the distal end of the wiping portion 10 b collides with the object X, a reacting force, which is generated by the collision, is received by the basal portion located at obliquely upward position. Accordingly, the distal end of the wiping portion 10 b can scrape and remove the object X.

Next, characteristic advantages according to the above discussed embodiment are described.

(1) The wiping portion 10 b has the cross-sectional shape, which inclines with respect to the downward hanging direction when the blade rubber 10 is in an unloaded state. In addition, the wiping portion 10 b of the present embodiment is configured so that the inclination direction of the wiping portion 10 b does not cross over the downward hanging direction during the wiping operation that includes the reversing operation. That is, both during the forward moving operation and during the backward moving operation, the inclination direction of the wiping portion 10 b is maintained to direct one side so that the inclination direction does not cross over the downward hanging direction to incline toward the other side. This prevents the blade rubber 10 from abruptly moving upward and downward and reduces the reversing operation noise, which generates at this time. During the reversing operation, the present invention only causes generation of any one of the upward and downward moving operations, but does not cause generation of both the upward and downward moving operations due to the reversing of the inclined posture as in conventional structure. Thus, it is possible to obtain an effect of reducing the reversing operation noise more concretely.

In addition, the wiping portion 10 b inclines with respect to the downward hanging direction. This reduces the rigidity in the up/down direction, and facilitates a resilient deformation in the up/down direction (in other words, curvature deformation in the longitudinal direction). Accordingly, the present invention improves ability to follow the curved wiped surface, and maintains the wiping ability.

(2) The wiping portion 10 b includes the distal end inclined portion 10 e arranged on the lower end of the wiping portion 10 b . The inclination direction of the distal end inclined portion 10 e is closer to the downward hanging direction than the inclination direction of the upper part of the wiping portion 10 b . Accordingly, the angle between the distal end of the wiping portion 10 b and the front windshield G in the traveling direction (the contacting angle of the wiping portion 10 b with respect to the front windshield G) can be optimized while facilitating an elastic deformation in the up/down direction. This reduces sliding resistance and improves wiping ability. Specifically, assuming that a wiping portion inclines largely with respect to the downward hanging direction when the wiping portion does not include a distal end inclined portion, such a configuration facilitates the elastic deformation of the wiping portion in the up/down direction while making an angle between the distal end of the wiping portion and the wiped surface in the traveling direction be smaller than an optimize angle. This increases the sliding resistance, while deteriorating wiping ability. The structure of the present invention overcomes these disadvantages.

(3) The wiping portion 10 b includes the distal end portion. The distal end portion has a width, which become narrower toward the front windshield. The width is defined by the first surface 10 m , which is located at the preceding side of the wiping portion 10 b in the traveling direction during the forward moving operation, and the second surface 10 n , which is located at the preceding side of the wiping portion 10 b in the traveling direction during the backward moving operation. During the forward moving operation, the first angle θz is formed between the first surface 10 m and the part of the front windshield G that is located at the preceding side in the traveling direction with respect to the wiping portion 10 b . During the backward moving operation, the second angle θz is formed between the second surface 10 n and the part of the front windshield G that is located at the preceding side in the traveling direction with respect to the wiping portion 10 b . The first angle θz is substantially the same as the second angle θz. Accordingly, similar wiping ability can be obtained during the frontward moving operation and during the backward moving operation.

(4) The wiping portion 10 b inclines to extend downward and toward the opposite side of the starting direction at the time of starting the wiping. This allows for a starting operation to be smooth as compared to a structure in which the wiping portion 10 b inclines to extend toward the starting direction at the time of starting the wiping. For example, assuming that the wiping portion 10 b inclines to extend toward a direction opposite to that in the above-described configuration, and weak adhesion is generated between the distal end of the wiping portion 10 b located at the stop position and the front windshield G. In this case, the wiper blade starts to move so as to push the distal end of the wiping portion 10 b . If the applied force is insufficient to release the adhesion, the wiping portion 10 b may incline toward the opposite direction or may not start to move smoothly. In contrast, in the above-described structure, the distal end of the wiping portion 10 b starts to move so as to be pulled. Accordingly, the present invention prevents the wiping portion 10 b from being inclined toward the opposite direction and allows for a smooth starting.

The above-described embodiment may be changed as follows.

The blade rubber 10 may be changed to a blade rubber having other structure. That is, the wiping portion only has to have a cross-sectional shape that inclines with respect to the downward hanging direction when the blade rubber is in the unloaded state.

For example, as shown in FIG. 6 , the basal portion 10 a may have a restriction projection 10 g that restricts the wiping portion 10 f from resiliently deforming upward from a predetermined position.

For example, as shown in FIG. 7 , the wiping portion 10 b may project from a center of the basal portion 10 a in the width direction.

For example, as shown in FIG. 8 , the wiping portion 10 h may not have the distal end inclined portion 10 e described in the above-described embodiment.

For example, as shown in FIG. 9 , the wiping portion 10 i may have a bending portion 10 j located at an intermediate part of the wiping portion 10 i . The bending portion 10 j changes an inclination direction of the wiping portion 10 i.

For example, the wiping portion 10 b in the embodiment may be changed to a wiping portion 10 k as shown in FIG. 10 . A basal portion 10 a includes an opposite side end portion that faces toward an opposite side (left side in FIG. 10 ) of the starting direction at the time of starting the wiping. The wiping portion 10 k projects from the opposite side end portion and extends toward the opposite side of the starting direction. The vehicle wiper device configured as described above is arranged in a stop position, which is set at the lower end of the front windshield G. In this configuration, the wiping portion 10 k is capable of flowing air stream during vehicle running (see arrows of chain double-dashed lines in FIG. 10 ) smoothly upward and rearward in a vehicle. This reduces an operation resistance during the backward moving operation, for example. In addition, the air stream during vehicle running is changed to a pushing force that directly pushes the blade rubber 10 . This suppresses the wiping portion 10 k from rising off the front windshield G and improves the wiping ability.

The stop position of the vehicle wiper device is not limited to the position at the lower end of the front windshield G. In a symmetrical twin wiper device, the stop position may be set at an upper reversing position located along a vehicle pillar. In this configuration, the air stream during vehicle running flows from a front of the vehicle toward two opposite ends of the front windshield in the width direction. Accordingly, this reduces the operation resistance during the backward moving operation and suppresses the wiping portion from rising off the front windshield G.

In the above-described embodiment, the distal end part of the wiping portion 10 b has a width, which becomes narrower toward the front windshield G. The angle θz is formed between the first surface 10 m and the front windshield G. The angle θz is formed between the second surface 10 n and the front windshield G. The angle θz is constant both during the forward moving operation and during the backward moving operation. The distal end part of the wiping portion 10 b may have a shape, which is not configured as described above. For example, as shown in FIG. 6 , the distal end portion has a shape that is obtained by cutting the distal end portion along a surface perpendicular to the two opposite side surfaces of the distal end portion.

In the above-described embodiment, the wiping portion 10 b inclines to extend downward and toward the opposite side of the starting direction at the time of starting the wiping. The wiping portion 10 b may extend in an opposite direction of the direction in the embodiment. That is, the wiping portion 10 b may incline to extend downwards and towards the starting direction side.

In the above-described embodiment, the blade rubber 10 is manufactured by the press forming using the lower die 21 and the upper die 22 . The embodiment is not limited to this. The blade rubber 10 may be manufactured by another method.

For example, as shown in FIG. 11 , the blade rubber 10 may be manufactured by an extrusion using a die 31 . Specifically, an extruded part, which has a shape in which two distal ends of two wiping portions 10 b of two blade rubbers 10 have been connected to each other, is manufactured. Subsequently, the extruded part is cut into two parts along a chain double-dashed line shown in FIG. 11 so that the blade rubbers 10 are formed.

In the above-described embodiment, the rubber holder corresponds to the lever assembly 9 , which includes the primary lever 6 , the secondary lever 7 , and the yoke 8 . The embodiment is not limited to this. For example, the rubber holder may be a lever-less type, which does not have a lever. A rubber holder of the lever-less type only grips a longitudinal central part of the blade rubber 10 . That is, the present invention may be applied to a so-called flat type wiper blade. In addition, in the above-described embodiment, the pair of backings 11 is received in the backing accommodation groove 10 c of the basal portion 10 a . The embodiment is not limited to this. For example, the basal portion 10 a may not have the backing accommodation groove 10 c . In this case, one backing may be arranged along a top surface of a basal portion and the rubber holder may grip the basal portion and the backing together. In addition, one backing may be received in and retained by a soft rubber holder.

Modified examples as discussed above are shown in FIG. 12A to 14 .

As shown in FIG. 12A , a wiper arm 1 includes an arm side connecting portion 1 a located at a distal end of the wiper arm 1 . As shown in FIG. 12B , a connector 50 is arranged at a center of a blade rubber 42 in the longitudinal direction and connects with the arm side connecting portion 1 a . The wiper arm 1 connects with the connector 50 through a pivot shaft portion 50 a to be pivotally moved.

In this example, the rubber holder includes a pair of cases 43 . The cases 43 are arranged at two opposite sides of the connector 50 in the longitudinal direction so that the connector 50 is located therebetween. Each case 43 is formed of soft resin material. Caps 51 are arranged respectively at two opposite ends of the rubber holder in the longitudinal direction, which includes two cases 43 , in other words, arranged respectively at two opposite ends of a rubber receiving portion 43 f.

As shown in FIG. 13 , the case 43 includes a backing receiving portion 43 e and a rubber receiving portion 43 f . The backing receiving portion 43 e receives and retains one backing 41 therein. The rubber receiving portion 43 f is located at a part of the case 43 closer to the front windshield G than the backing receiving portion 43 e and extends along the longitudinal direction. The backing 41 having a plate shape is received so that a plate surface extends parallel with the width direction (the direction along the forward and backward moving operations), which extends substantially along the front windshield G. The backing 41 extends along the longitudinal direction of the wiper blade 2 so as to apply spring resilience to the blade rubber 42 .

The rubber receiving portion 43 f receives and retains (grips) substantially entire part of the basal portion 42 a of the blade rubber 42 in the longitudinal direction. The rubber receiving portion 43 f includes a longitudinal slit 43 g , which extends along the longitudinal direction and opens toward the front windshield G. As shown in FIG. 12B , the caps 51 are arranged respectively at two opposite ends of the rubber holder in the longitudinal direction, which includes two cases 43 , in other words, arranged respectively at two opposite ends of the rubber receiving portion 43 f.

The case 43 includes a pair of gripping portions 43 a located at a lower portion (lower portion in FIGS. 13 and 14 ) of the case 43 . The gripping portions 43 a project inward in the width direction, respectively, and grip the basal portion 42 a . An outer surface of each of the gripping portions 43 a in the width direction forms a width extending surface 43 b . The width extending surface 43 b extends outward in the width direction and away from the wiped surface (above in FIGS. 13 and 14 ). A center L1 between the gripping portions 43 a in the width direction coincides with a center L2 of the backing 41 in the width direction.

The blade rubber 42 includes a basal portion 42 a and a wiping portion 42 b , which extends downward (i.e., toward the front windshield G when assembled in the vehicle) from the basal portion 42 a . That is, the wiping portion 42 b connects with a part of the basal portion 42 a that is located in the rubber receiving portion 43 f through the longitudinal slit 43 g . The wiping portion 42 b slidably contacts the front windshield G to wipe the front windshield G along the width direction (left/right direction in FIG. 14 ). The wiping portion 42 b of the blade rubber 42 extends so as to incline with respect to the downward hanging direction (downward direction in FIG. 13 ) perpendicular to the width direction.

The basal portion 42 a includes a pair of gripped groove 42 c , which are located at two opposite sides of the basal portion 42 a in the width direction and extend along the longitudinal direction. The gripped groove 42 c receives a distal end part of the gripping portion 43 a so that the basal portion 42 a is gripped by the gripping portion 43 a . This assembling is made by moving the blade rubber 42 and the case 43 relative to each other in the longitudinal direction while inserting the gripping portion 43 a into the gripped groove 42 c . The caps 51 arranged at two opposite sides of the cases 43 in the longitudinal direction prevent the blade rubber 42 from moving in the longitudinal direction with respect to the rubber receiving portion 43 f.

As shown in FIG. 13 , the wiping portion 42 b has a cross-sectional shape that inclines with respect to the downward hanging direction (downward in FIG. 13 ) perpendicular to the width direction (a direction substantially along the front windshield G, or left/right direction in FIG. 13 ) when the blade rubber 42 is in the unloaded state.

Specifically, the basal portion 42 a includes a supporting and contacting portion 42 d , which contacts and is supported by the width extending surface 43 b located at an opposite side of the starting direction at the time of starting the wiping. The wiping portion 42 b extends from the supporting and contacting portion 42 d . The wiping portion 42 b extends downward and toward the opposite side of the starting direction at the time of starting the wiping.

The wiping portion 42 b includes a lowest portion and a resin member 45 , which connects with the lowest portion. At least the basal portion 42 a in the wiping portion 42 b is formed by a resilient member 44 . The resin member 45 is harder than the resilient member 44 . The resin member 45 is formed from a material, which is in the same series as the resilient member 44 and has compatibility with the resilient member 44 . The compatibility means the nature by which equal to or more than two substances have affinity to each other to form solution or compound.

Specifically, in this example, the basal portion 42 a and a part of the wiping portion 42 b other than the lowest portion (resin member 45 ) is formed by the resilient member 44 . The resilient member 44 is formed from thermoplastic elastomer polyester (TPEE), for example.

The resin member 45 is formed from polyethylene terephthalate (PET), which is in ester series, for example. Accordingly, the resin member 45 is harder than the resilient member 44 . It is preferable that the resin member 45 has a low friction coefficient. That is, when applying constant load to the resin member 45 and the resilient member 44 , the resin member 45 has a deformation amount, which is smaller than that of the resilient member 44 . The resin member 45 is in the same series as the resilient member 44 and has compatibility with the resilient member 44 .

The resin member 45 has a cross-sectional area, which is determined based on the insertion force when assembling the case 43 with the blade rubber 42 , and the tensile strength of the resin member 45 . That is, the cross-sectional area of the resin member 45 is determined so that a value obtained by multiplying the tensile strength of the resin member 45 by the cross-sectional of the resin member 45 is larger than the insertion force when assembling. This prevents the resin member 45 from being divided into parts in the longitudinal direction when assembling.

The cross-sectional shape of the resin member 45 includes two side surfaces, which are parallel to each other and arranged in the width direction of the resin member 45 , a distal surface, which extends so as to form right angles with the two side surfaces, and corners formed by the two side surfaces and the distal surface. The corner of the resin member 45 contacts the front windshield G.

The basal portion 42 a and the case 43 include inclination surfaces 42 e , 43 c , which are arranged at the opposite side of the starting direction at the time of stating the wiping. The inclination surfaces 42 e , 43 c extend obliquely upward (opposite side of the downward hanging direction, upward in FIGS. 13 and 14 ) in the cross-section, which is perpendicular to the longitudinal direction. That is, the inclination surfaces 42 e , 43 c extend toward the starting direction and incline by a rising slope. The inclination surfaces 42 e , 43 c continue to each other without having a step difference. The inclination surfaces 42 e , 43 c are formed entirely at portions of the blade rubber 42 and the case 43 that are arranged at the opposite side of the starting direction at the time of starting the wiping. That is, the blade rubber 42 includes the inclination surface 42 e , which is formed continuously on the basal portion 42 a (supporting and contacting portion 42 d ) and on the wiping portion 42 b . “The inclination surfaces 42 e , 43 c continue to each other without having a step” means that the inclination surfaces 42 e , 43 c do not includes a portion, which does not incline upward (upward in FIGS. 13 and 14 ) and toward the starting direction. The inclination surfaces 42 e , 43 , which do not include the step differences, are not limited to flat surfaces. The inclination surfaces 42 e , 43 c are curved in this example.

The case 43 has an upper portion. The upper portion includes a convex part 43 d arranged at the opposite side of the wiping direction. The convex part 43 d increases a surface area of the inclination surface 43 c.

The basal portion 42 a of the blade rubber 42 includes an impact absorbing portion 42 f . For example, when releasing a lock back state of the vehicle wiper, the case 43 is brought into contact with the front windshield G and receives an impact (force) from the front windshield G. The impact is greater than a normal biasing force, which is generated by the biasing mechanism to push for the wiping portion 42 b so as to keep contact with the front windshield G. The impact acts on the case 43 in a direction same as a direction of the biasing force from the biasing mechanism. The impact absorbing portion 42 f is arranged at a part of the blade rubber 42 that contacts the front windshield G at a time after the wiping portion 42 b contacts the front windshield G during the releasing of the lock back state. In this example, a part of the basal portion 42 a of the blade rubber 42 forms the impact absorbing portion 42 f . That is, during the releasing of the lock back state, the wiping portion 42 b primarily collides with the front windshield G. In this case, since the wiping portion 42 b inclines, the wiping portion 42 b is likely to fail to absorb the impact only by the wiping portion 42 b . Failure of absorbing the impact leads to incline and move the case 43 toward the front windshield G. This is likely to bring the case 43 into contact with the front windshield G. The impact absorbing portion 42 f is arranged at the portion, which is likely to contact the front windshield G at this time.

The wiping portion 42 b includes a basal portion formed with a cooling hole 42 g , which extends along the longitudinal direction. The cooling hole 42 g functions to sufficiently cool the blade rubber 42 during formation of the blade rubber 42 . The blade rubber may not have the cooling hole 42 g.

The above modified example has characteristic advantages as discussed below in addition to the advantages same as in the above embodiment.

The wiping portion 42 b includes the lowest portion, which connects with the resin member 45 . The resin member 45 is harder than the resilient member 44 , which forms the basal portion 42 a . Accordingly, when the blade rubber 42 is pushed toward and contacts the front windshield G, the blade rubber 42 can contact the front windshield G by a short length in the width direction. This reduces the friction force to be generated during the wiping. In addition, the resin member 45 has a compatibility with the resilient member 44 . This improves the coupling force between the two members as compared to a blade rubber, which includes two members (e.g., natural rubber and polyethylene) coupled to each other by two color extrusion or the like without considering material properties between two members. Accordingly, the present invention allows for the two members so as not likely to be separated from each other, and to increases durability of the blade rubber 42 .

The case 43 and the basal portion 42 a include the inclination surface 42 e , 43 c , which are arranged at the opposite side of the starting direction at the time of starting the wiping with respect to the case 43 and the basal portion 42 a . The inclination surface 42 e , 43 c incline by a rising slope toward the starting direction in the cross-section, which is perpendicular to the longitudinal direction. The inclination surfaces 42 e , 43 c continue to each other without having a step difference. Accordingly, when the wiper blade is arranged so as to extend generally along the lower end of the front windshield G, the inclination surface 42 e , 43 c are capable of flowing air stream during vehicle running smoothly upward and rearward in the vehicle. This reduces operation resistance during the backward moving operation, for example. In addition, the air stream during vehicle running is changed to a pushing force directing toward the front windshield G (downward). This suppresses the case 43 and the blade rubber 42 from rising off the front windshield G and improves wiping ability.

The inclination surface 42 e , 43 c are arranged at the entire portions of the case 43 and the blade rubber 42 that are arranged at the opposite side of the starting direction at the time of starting the wiping with respect to the case 43 and the basal portion 42 a . Accordingly, when the wiper blade is arranged so as to extend generally along the lower end of the front windshield G, the inclination surface 42 e , 43 c are capable of flowing air stream during vehicle running smoothly upward and rearward in the vehicle. This reduces an operation resistance during the backward moving operation, for example. In addition, the air stream during vehicle running is changed to a pushing force directing toward the front windshield G (downward). This suppresses the case 43 and the blade rubber 42 from rising off the front windshield G and improves the wiping ability.

The case 43 has the upper portion. The upper portion includes the convex part 43 d arranged at the opposite side of the starting direction. Accordingly, the convex part 43 d increases the surface area of the inclination surface 43 c . In addition, the convex part 43 d suppresses the negative pressure from being generated in the upper part of the case 43 . This further suppresses the case 43 and the blade rubber 42 from rising off the front windshield G. That is, when the wiper blade is arranged so as to extend generally along the lower end of the front windshield and when the case 43 does not include the convex part 43 d , air stream (separated flow) which flows to separate from the inclination surface is generated at this portion so as to generate the negative pressure at this portion. The negative pressure generates the force, which acts to raise the case 43 . Since the convex part 43 d is formed, the negative pressure is suppressed to generate. Accordingly, this configuration further suppresses the case 43 and the blade rubber 42 from rising off the front windshield G and further improves the wiping ability.

When releasing the lock back state of the vehicle wiper, the wiping portion 42 b receives the force that is greater than the biasing force generated from the biasing mechanism so as to bring the wiping portion 42 b into contact with the front windshield G. In the above configuration, the impact absorbing portion 42 f is arranged at the part of the blade rubber 42 that contacts the front windshield G at the time after the wiping portion 42 b contacts the front windshield G during the releasing of the lock back state. This suppresses the impact acting on the front windshield G. That is, when releasing the lock back state of the vehicle wiper, the rubber holder receives the force that is greater than the biasing force generated by the biasing mechanism and along the direction same as the biasing force generated by the biasing mechanism. At this time, the impact cannot be absorbed only by the wiping portion 42 b due to the inclination of the wiping portion 42 b . This inclines the case 43 so that the case 43 is likely to collide with the front windshield G. The case 43 , which is harder than the resilient member 44 is prevented from colliding the front windshield G. This suppresses the impact acting on the front windshield G. In addition, the impact absorbing portion 42 f is formed with the blade rubber 42 (resilient member 44 ) as a single member. Accordingly, the impact which acts on the front windshield G is suppressed by using elasticity of the blade rubber 42 without adding any other component.

The above example (see FIGS. 13 and 14 ) may be changed as shown in FIG. 15 . In the above example, the center L1 between the gripping portions 43 a in the width direction coincides with the center L2 of the backing 41 in the width direction. The center L1 between the gripping portions 43 a in the width direction may be located at a position moved toward the opposite side of the starting direction at the time of starting the wiping from the center L2 of the backing 41 in the width direction. When the center L1 between the gripping portions 43 a in the width direction is moved toward the wiping portion 42 b as discussed above, material for the blade rubber 42 , which is consumable can be reduced. In this example, the center L1 in the width direction is set at a position moved toward the starting direction at the time of starting the wiping from a center of an assembly including the blade rubber 42 and the case 43 in the width direction. In this example, the cooling hole 42 g is eliminated. In FIG. 15 , same reference numerals are applied to same or similar parts as in the above example (see FIGS. 13 and 14 ) and a detailed explanation is omitted.

The above example (see FIGS. 13 and 14 ) may be changed as shown in FIG. 16 . In the above example, the pair of the gripping portions 43 a are symmetrically arranged in the width direction with respect to the center L2 of the backing 41 in the width direction (or with respect to the downward hanging direction). However, the pair of the gripping portions 43 a may be symmetrically arranged with respect to a center line L3, which inclines from the center L2. This configuration can reduce the material for the blade rubber 42 , which is consumable. In FIG. 16 , same reference numerals are applied to same or similar parts as in the above example (see FIGS. 13 and 14 ) and a detailed explanation is omitted.

As shown in FIG. 17 , a center line L3 and a center line L4 may be parallel to each other. Specifically, the center line L3 may be parallel to the center line L4 of the wiping portion 42 b , which is in the state of being pushed toward and contacted with the front windshield G. This configuration can reduce the material for the blade rubber 42 , which is consumable. In FIG. 17 , same reference numerals are applied to same or similar parts as in the above example (see FIGS. 13 and 14 ) and a detailed explanation is omitted.

In the above example, the case 43 and the blade rubber 42 , which includes the resin member 45 are separately formed, and the blade rubber 42 is assembled to the case 43 . However, the present invention is not limited to this. The blade rubber 42 and the case 43 may be integrally formed by multicolor extrusion or the like. This allows for the case 43 to retain the blade rubber 42 .

As shown in FIG. 18 , a vehicle wiper device may be arranged on a rear windshield RG serving as a wiped surface. In this configuration, inclination surfaces 42 e , 43 c incline with respect to a vertical direction so as to extend from the rear windshield RG by a descending slope when the blade rubber 42 and the case 43 are positioned at a stop position. This configuration effectively prevents accumulation of trash such as dead leaves in the blade rubber 42 and the case 43 .

In the above examples (see FIGS. 13 to 18 ), the resin member 45 and the resilient member 44 are described respectively as polyethylene terephthalate (PET) and thermoplastic elastomer polyester (TPEE) of ester series. These materials may be changed, but compatibility is required. For example, the resin member 45 in the above example may be changed to polyester of ester series.

For example, the resin member 45 may be polypropylene (PP), polyethylene (PE) and polyphenylene ether (PPE) of olefin series. The resilient member 44 may be ethylene-propylene-diene terpolymer (EPDM), nitrile rubber (NBR) and ethylene-propylene rubber (EPM) of olefin series.

For example, the resin member 45 may be polystyrene (PS) of styrene series. The resilient member 44 may be styrene-butadiene rubber (SBR), epoxy resin (EP), epoxy acrylate (EPA), ethylbenzene (EB), cis-1,4 polybutadiene rubber (BR), isoprene rubber (IR), hydrogenation (styrene)-butadiene rubber and hydrogenation polyisobutylene of styrene series.

For example, the resin member 45 may be silicone (resin). The resilient member 44 may be silicone (elastomer). For example, the resin member 45 may be polytetrafluoroethylene (PTFE). The resilient member 44 may be fluoro-rubber.