In a liquid-sealed type vibration isolator having a first orifice flow channel 56 and a second orifice flow channel 60 , a valve member 66 formed of a rubber elastomeric membrane for opening and closing the second orifice flow channel 60 is provided on a partitioning member 40 so as to be orthogonal to the direction of flow in the second orifice flow channel. The valve member is held at the outer peripheral portion thereof by a wall surface of a valve housing chamber 68 , and includes inside the outer peripheral portion thereof a membrane portion 66 B which is subjected to the flexural deformation by the liquid flow in the second orifice flow channel to close openings 60 C and 60 D of the second orifice flow channel. Communicating holes 76 which bring the second orifice flow channel into communication are provided at positions not overlapped with the opening of the membrane portion 66 B. Accordingly, the switching of characteristics is enabled with an inexpensive structure.

Claims

19 · 1 independent · depth 4

19 granted claims

›1.independentA liquid-sealed type vibration isolator comprising:na first fixture to be fixed to one of a vibration source side and a support side;a second fixture …+18

A liquid-sealed type vibration isolator comprising:na first fixture to be fixed to one of a vibration source side and a support side;a second fixture to be fixed to the other one of the vibration source side and the support side;a vibration-isolating base member made of an elastomer interposed between the first fixture and the second fixture;a main liquid chamber having liquid sealed therein and a chamber wall thereof defined partly of the vibration-isolating base member;at least one auxiliary liquid chamber having liquid sealed therein and a chamber wall thereof defined partly of a diaphragm formed of an elastomeric membrane;a first orifice flow channel configured to communicate the main liquid chamber and the at least one auxiliary liquid chamber;a second orifice flow channel tuned to a higher frequency range than the first orifice flow channel and configured to communicate any two of the main liquid chamber and the at least one auxiliary liquid chamber;a partitioning member configured to partition the main liquid chamber and the at least one auxiliary liquid chamber and formed with the second orifice flow channel; anda valve member formed of an elastomeric membrane for opening and closing the second orifice flow channel,wherein the partitioning member includes a valve housing chamber configured to house and hold the valve member in a part of the second orifice flow channel so as to be orthogonal to the direction of flow in the flow channel,the valve member is held at an outer peripheral portion thereof between wall surfaces of the valve housing chamber, and includes inside the outer peripheral portion thereof a flexible membrane portion configured to be subjected to flexural deformation by the liquid flow in the second orifice flow channel and thereby close an opening of the second orifice flow channel to the valve housing chamber provided in the partitioning member, andthe membrane portion includes a communication hole configured to bring the second orifice flow channel into communication at a position not being overlapped with the opening of the partitioning member to open the second orifice flow channel in a state in which the membrane portion is apart from the opening.

›2.↳ 1The liquid-sealed type vibration isolator according to claim 1, wherein the membrane portion includes a projection provided on a membrane surface ther…d2+2

›5.↳ 1The liquid-sealed type vibration isolator according to claim 1, wherein an annular projecting portion is provided on a peripheral edge portion of the …d2+2

›8.↳ 1The liquid-sealed type vibration isolator according to claim 1, wherein the second orifice flow channel is provided so as to communicate the main liqu…d2

›9.↳ 1The liquid-sealed type vibration isolator according to claim 1, wherein the at least one auxiliary liquid chamber comprises a first auxiliary liquid c…d2+2

›12.↳ 1The liquid-sealed type vibration isolator according to claim 1, wherein the opening of the partitioning member opposing a membrane surface of at least…d2+2

›15.↳ 1The liquid-sealed type vibration isolator according to claim 1, wherein the rigidity of the membrane portion is set to be non-uniform over a circumfer…d2+2

›18.↳ 1The liquid-sealed type vibration isolator according to claim 1, wherein flexural deformation restricting projections configured to restrict the flexur…d2

›19.↳ 1The liquid-sealed type vibration isolator according to claim 1, wherein the outer peripheral portion of the valve member is formed to be thicker than …d2

Classifications

2 codes

IPC · International Patent Classification

Section F — Mechanical engineering; lighting; heating; weapons

F16F13/00

USPC · US Patent Classification

267/140.13

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File wrapper

Pendency

4.9 y

1,803 days filing → grant

Office actions

non-final + final

Responses

no RCE

Examiner

Christopher Schwartz

art unit 3657 · TC 3600

Law firm

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Citations: 60 back · 0 forward

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Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20110210488 A1	1 Sep 2011

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