US 5,501,433 AGranted

Liquid sealing and vibration isolator

AssigneeYamashita Rubber Kabushiki Kaisha

InventorKazutoshi Satori

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Abstract

A vibration isolator includes a substantially sealed space within a housing 4 forming a liquid chamber by partitioning the sealed space with a diaphragm 5. The liquid chamber is further partitioned into first and second chambers 7 and 8 by a rubber partition wall 6. An orifice passage 9 is arranged to communicate between these two chambers 7 and 8. The rubber partition wall 6 is provided at its intermediate portion with a membrane portion 11, a part of which is adapted to serve as a stopper portion 12. When the membrane portion 11 is bent and deformed downwardly, the stopper portion 12 is pushed, at its front end, on a partition wall supporting member 14 for deformation. The repulsion force of the stopper portion 12 by the deformation varies non-linearly in response to the deformation of the membrane portion 11 and as a result, the spring characteristic of the membrane portion 11 also becomes non-linear.

Claims40

Dependent claims

A liquid sealing and vibration isolating apparatus comprising:

a first connecting member attached to at least one of a body and a vibrating member;
a second connecting member attached to at least one of the other of the body and the vibrating member;
an elastic body provided between the first and second connecting members;
a liquid chamber provided between the elastic body and a wall portion formed by either of the first and second connecting member;
a partition wall for dividing the liquid chamber into two chambers;
and
an orifice for communicating between the two liquid chambers divided by the partition wall;
wherein the partition wall is provided with a membrane portion allowing elastic deformation corresponding to an input vibration and with a stopper portion integrally formed with the membrane portion and adapted to abut against an immovable portion when the membrane portion is elastically deformed, said stopper portion being formed at a periphery of the membrane portion and projecting continuously in a circumferential direction thereof and further including an immovable portion positioned adjacent to said stopper portion and being disposed to be substantially perpendicular to the projecting direction of said stopper portion.

5 more elements

A liquid sealing and vibration isolating apparatus comprising:

a first connecting member attached to at least one of a body and a vibrating member;
a second connecting member attached to the other of the body and the vibrating member;
an elastic body provided between the first and second connecting members;
a liquid chamber provided between the elastic body and a wall portion formed by either of the first and second connecting member;
a partition wall for dividing the liquid chamber into two chambers;
and
an orifice for communicating between the two liquid chambers divided by the partition wall;
wherein the partition wall is provided with a membrane portion allowing elastic deformation corresponding to an input vibration and with a stopper portion integrally formed with the membrane portion and adapted to abut against an immovable portion when the membrane portion is elastically deformed, said membrane portion and said orifice portion being formed independent of each other, and a partition wall being formed by connecting the membrane portion with the orifice and further including a groove positioned between the orifice portion and the membrane portion, and the orifice portion is adapted to come into engagement with a partition wall supporting member of generally U-shaped cross section which is provided with an inner wall to be inserted into the groove.

5 more elements

A liquid sealing and vibration isolating apparatus comprising:

a first connecting member attached to at least one of a body and a vibrating member;
a second connecting member attached to the other of the body and the vibrating member;
an elastic body provided between the first and second connecting members;
a liquid chamber provided between the elastic body and a wall portion formed by either of the first and second connecting member;
a partition wall for dividing the liquid chamber into two chambers;
and
an orifice for communicating between the two liquid chambers divided by the partition wall;
wherein the partition wall is provided with a membrane portion allowing elastic deformation corresponding to an input vibration and with a stopper portion integrally formed with the membrane portion and adapted to abut against an immovable portion when the membrane portion is elastically deformed, said partition wall is provided with a membrane portion and an orifice portion integrally formed therewith, and further including a groove positioned between the orifice portion and the membrane portion, and the orifice portion is adapted to come into engagement with a partition wall supporting member of generally U-shaped cross section which is provided with an inner wall to be inserted into the groove.

5 more elements

Dependencies are inferred from the claim text.