Driving structure between front and rear wheels of a vehicle

1) Field of the Invention

The invention herein relates to a driving structure between front and rear wheels of a vehicle, more especially, a driving structure, through the link-up of the steel cable, makes the synchronous driving of the front and rear wheels to increase the turning torsion of the mobile body.

2) Description of the Prior Art

The rear wheel of the conventional bicycle, the beach mobile or the motorcycle, due to the structural design, can only be turned by the link of the foot pedal or the engine and the front wheel turns freely. Therefore, when climbing a slope or running on the muddy road, the mobile body often fails in proceeding because of the skidding of the rear wheel. Although the present automobile is equipped with the so-called synchronous driving design for the front and the rear wheels, the four-wheeled automobile uses the different link-up method and structure. Therefore, the driving mechanism used for the automobile is not suitable for the mobiles such as the bicycles and that imperfection makes the light mobiles lack practical value. This kind of shortcoming has been criticized by and troubled the manufacturers and the consumers for a long time. Therefore, it is necessary to provide a driving structure between the front and rear wheels capable of specifically increasing the effect and enhancing the practical value of the product.

The primary objective of the invention herein is to provide a driving structure between the front and rear wheels which comprises two wheel naves, or hubs, with gear disks, sleeves, rolls and axle cores mounted thereon and arresting members of polygonal crown supporting ribs on the circumference disposed between the axle cores and the rolls so as to mount two wheel hubs on the turning axles of the front and the rear wheels of the bicycle, the beach mobile or the motorcycle. Two bevel gears pivotally jointed to the gear disks and connected by the steel cables achieve the effect of making the front and the rear wheels drive synchronously to increase the torsion of the mobile by the push of the rolls and through the link-up of the steel cables and the bevel gears by the turning of the rear wheel.

To enable a further understanding of the main features and innovation of the invention herein, the brief description of the drawings below is followed by detailed description of the preferred embodiment.

FIG. 1 is a pictorial isometric drawing of the invention herein.

FIG. 2 is a cross-sectional drawing of the wheel nave structure of the invention herein.

FIG. 3 is an cross-sectional drawing of the link-up embodiment of the wheel naves of the invention herein in application.

FIG. 4 is a side view of the application of the invention herein.

FIG. 5 is a schematic drawing of the link-up embodiment of the invention herein.

Referring to FIGS. 1, 2 , & 3 , the invention herein mainly comprises of two hubs ( 1 ) with gear disks ( 11 ) thereon and covering wheel nave sleeves ( 12 ) and having roll housing rings ( 13 ) with several round slots ( 131 ) mounted inside the sleeves ( 12 ) to locate the same amount of pushing rolls ( 14 ) into the round slots ( 131 ).

An arresting member ( 15 ) is jointed to the axle core ( 16 ), wherein the circumference of the said arresting member ( 15 ) has spaced apart crown supporting ribs ( 151 ) and in the same amount as the rolls ( 14 ). The crown supporting ribs ( 151 ) project in gradually increasing height from the circumference of the arresting member ( 15 ) defining the enlarging gaps ( 17 ) between the rolls ( 14 ) and the arresting member ( 15 ).

Two bevel gears ( 2 ) Pivotally engage the gear disks ( 11 ) and are joined to two cubical fastening blocks ( 21 ) and connected by steel cable ( 22 ).

Through the assembly of the members mentioned above, the two wheel hubs ( 1 ) are mounted respectively on the front and the rear wheels of the bicycle, the beach mobile or the motorcycle; when the rear wheel turns (as the pedals of the bicycle are turned), the arresting member ( 15 ) crowns urge the rolls ( 14 ) against the wheel sleeves ( 1 2 ) to drive the gear disk ( 11 ) and turn the gear disk ( 11 ) of the front wheel via the link-up of the bevel gears ( 2 ). Therefore, the roll ( 14 ) pushes against the arresting member ( 15 ) and the sleeve ( 12 ) to drive the axle core ( 16 ) to make the front and the rear wheels drive synchronously to increase the turning torsion. When the arresting member ( 15 ) of the rear wheel is not turning (as when the pedals of the bicycle are not turning), the rolls ( 14 ) separates from the sleeve ( 12 ) to make the front and the rear wheels turn freely.

Referring to FIGS. 4 & 5, the invention herein can be applied to the general bicycle, beach mobile or the motorcycle. As shown in FIG. 4, when applied to the bicycle ( 3 ), two wheel hubs ( 1 ) are mounted respectively on the turning axles of the front and the rear wheels ( 31 , 32 ) and engage the bevel gears ( 2 ) connected by the steel cable ( 22 ). When the bicycle ( 3 ) is pedaled to move, through the link-up of the bevel gears, the front and rear wheels ( 31 , 32 ) drive synchronously so as to increase the turning torsion. Therefore, if the mobile is stuck in the mud or climbing a slope, the ground grabbing force can be enhanced to enable the mobile to run more smoothly and with more energy-saving.

In summation of the foregoing, the invention herein, using the wheel hubs mounted with the rolls, the arresting members and the gear disks to combine with the bevel gears and the link-up steel cables to construct the link between the front and the rear wheels increases the linking torsion of the mobile.