JP4646995B2 - Liquid-filled vibration isolator - Google Patents

Description

The present invention includes a first fixture, a cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and a vibration isolating base attached to the second fixture. A diaphragm for forming a liquid sealing chamber, a partition for partitioning the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side, the first liquid chamber and the second liquid chamber And an orifice for communicating
The partition includes an elastic partition membrane, a first lattice member that regulates a displacement amount of the elastic partition membrane from the outer side of one surface of the elastic partition membrane, and an outer side of the other surface of the elastic partition membrane. The present invention relates to a liquid-filled vibration isolator comprising a second lattice member that regulates the amount of displacement of the elastic partition membrane from the side.

The liquid-filled vibration isolator is provided, for example, between a vehicle transmission and a vehicle body member, or between an engine and a vehicle body frame. When a large amplitude vibration occurs due to the unevenness of the traveling road surface, the liquid flows between the two liquid chambers through the orifice, and the vibration is attenuated by the liquid flow effect. On the other hand, when vibration with a small amplitude occurs, liquid does not flow between both liquid chambers, and the elastic partition film is reciprocally deformed (or reciprocally displaced) to attenuate the vibration.

In this type of liquid-filled vibration isolator, abnormal noise is likely to occur when the elastic partition film collides with the lattice member. Therefore, as disclosed in Patent Document 1, a liquid-sealed vibration isolator has been developed in which a plurality of convex portions are distributed on both sides of an elastic partition film at equal angles in the circumferential direction. In this liquid-filled vibration isolator, if the convex portion is small, it is difficult to form the convex portion, and the durability of the convex portion is lowered. In addition, the convex portion is formed to be slightly large.

French Patent Publication No. 2647590

According to the above conventional configuration, since the convex portion is large, it is difficult to softly collide with the lattice member, and abnormal noise cannot be sufficiently reduced. When the convex portion is made small, the above-described problems occur, and a liquid-filled vibration isolator capable of reducing abnormal noise has been desired.

An object of the present invention is to provide a liquid-filled vibration isolator capable of sufficiently reducing abnormal noise.

According to a first aspect of the present invention, in the liquid-filled vibration isolator described at the beginning, rib groups are respectively provided on both sides of the elastic partition film, and the rib group is formed with respect to the axis of the elastic partition film. And a plurality of annular first ribs positioned concentrically, and a plurality of second ribs positioned radially with respect to the shaft core, the second rib being between a pair of adjacent first ribs. A plurality of each, and are distributed over the circumference of the elastic partition membrane around the axis of the elastic partition membrane, and the plurality of first ribs are arranged at equal intervals in the radial direction of the elastic partition membrane, The first ribs are disposed on the axial center side and the outer peripheral edge side of the elastic partition membrane, respectively, and a predetermined number of the first ribs are disposed in the radial intermediate portion of the elastic partition membrane, and the plurality of first ribs are Arranged at equal intervals in the radial direction of the elastic partition membrane, The plurality of second ribs are equally arranged around the axis of the elastic partition membrane at the same angle, and the plurality of second ribs adjacent in the radial direction of the elastic partition membrane are the elastic partition membranes. Both ends of the plurality of second ribs displaced in the circumferential direction of the elastic partition membrane are connected to the pair of first ribs on both sides thereof, and the radial direction of the elastic partition membrane A gap that is surrounded by the pair of adjacent first ribs and the pair of second ribs adjacent in the circumferential direction of the elastic partition membrane and is adjacent in the radial direction of the elastic partition membrane is positioned in the circumferential direction of the elastic partition membrane The first rib and the second rib are configured so as to be softly collided by the gap when the elastic partition film collides with the first lattice member and the second lattice member. is there.

According to this configuration, the rib groups project from both surfaces of the elastic partition film, and the rib groups include the plurality of annular first ribs concentrically positioned with respect to the axis of the elastic partition film and the shaft core. Therefore, even if each rib is thin, the rib group can be formed into a strong structure, and durability can be improved. That is, the first rib and the second rib can be thinly formed, and when the elastic partition film collides with the lattice member with vibration, the first rib and the second rib can easily absorb the impact. As a result, the elastic partition film can be softly collided with the lattice member.

If the plurality of second radial ribs are long, the rigidity of the rib group becomes too strong, and the first rib and the second rib may not easily absorb the impact. However, in the configuration of claim 1, the second rib is Since a plurality of the first ribs are arranged between each pair of adjacent first ribs, the second ribs can be shortened, and the rigidity of the rib group can be suppressed from becoming too strong. Ribs easily absorb shocks.

Since the plurality of second ribs are distributed over the entire circumference of the elastic partition film around the axis of the elastic partition film, the impact can be absorbed almost uniformly over the entire surface of the elastic partition film.
The first ribs are disposed on the axial center side and the outer peripheral edge side of the elastic partition membrane, respectively, and a predetermined number of the first ribs are disposed in the radial intermediate portion of the elastic partition membrane.
According to this configuration, the first rib can be dispersed from the axial core side to the outer peripheral edge side of the elastic partition membrane, and the rigidity of the rib group can be easily set to an appropriate strength. The second rib easily absorbs the impact.
The plurality of first ribs are arranged at equal intervals in the radial direction of the elastic partition membrane, and the plurality of second ribs are arranged uniformly around the axis of the elastic partition membrane at the same angle. Yes.
According to this configuration, the rigidity of the rib group can be easily set to a desired strength, and the first rib and the second rib can easily absorb the impact. Moreover, it becomes easy to absorb an impact uniformly over the whole surface of an elastic partition film.
If the second ribs adjacent to each other in the radial direction of the elastic partition membrane are connected in a straight line, there is a possibility that the rigidity of the rib group becomes excessively strong. However, according to the configuration of claim 1, the adjacent second ribs are Since the position is displaced in the circumferential direction of the elastic partition film, the rigidity of the rib group can be suppressed from becoming too strong, and the first rib and the second rib can easily absorb the impact.

According to the present invention, there is a gap between the pair of first ribs adjacent in the radial direction of the elastic partition membrane and the pair of second ribs adjacent in the circumferential direction of the elastic partition membrane and adjacent in the radial direction of the elastic partition membrane. Since the elastic partition membrane is displaced in the circumferential direction, when the elastic partition membrane collides with the lattice member due to vibration, the first rib and the second rib easily absorb the impact, and the elastic partition membrane is latticed. Since it can be made to softly collide with a member, a liquid filled type vibration isolator capable of sufficiently reducing abnormal noise can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a liquid-filled vibration isolator for an FR vehicle. This liquid-filled vibration isolator includes a first fixture 1 that is attached to a transmission via a mounting bracket 14, a cylindrical second fixture 2 that is attached to a member on the vehicle body side, and a rubber-like elasticity that connects them. And an anti-vibration base 3 made of a material.

The first fixture 1 is formed in a columnar shape having a flange-like stoppered portion 32, and the upper end portion thereof is connected to the mounting bracket 14. The second fixture 2 includes a cylindrical metal fitting 4 on which the vibration isolating base 3 is vulcanized, a cylindrical bottom metal fitting 5, and a cylindrical stopper metal fitting 7 that covers the vibration isolating base 3 and the stopper portion 32. Become. These three members are positioned concentrically, and the flanges on one end side in the axial direction are caulked and fixed integrally.

The stopper fitting 7 regulates the amount of displacement between the first fixture 1 and the second fixture 2. A mounting surface portion 10 as a connecting portion for a member on the vehicle body side is formed on the bottom portion of the stopper metal member 7 so as to protrude, and a plurality of mounting bolts 6 are press-fitted and fixed to the mounting surface portion 10.

The anti-vibration base 3 is formed in a truncated cone shape having a hollow bottom side, and its upper end surface is vulcanized and bonded to the first mounting bracket 1 and its lower end portion is vulcanized and bonded to the inner peripheral surface portion of the cylindrical bracket 4.

A diaphragm 9 that forms a liquid enclosure chamber 8 is attached to the bottom metal 5 between the bottom surface of the vibration isolator base 3 and a liquid is enclosed in the liquid enclosure chamber 8. Further, a regulating plate 28 that regulates the flow of the liquid in the liquid enclosure 8 is fixed to the lower end portion of the first fixture 1 with a mounting bolt 29. The diaphragm 9 is made of a rubber film.

The partition body 12 that partitions the liquid sealing chamber 8 into the first liquid chamber 11A on the vibration-isolating base 3 side and the second liquid chamber 11B on the diaphragm side is sandwiched and fixed between the bottom portion of the bottom metal fitting 5 and the bottom portion of the cylindrical metal fitting 4. It is.

The partition 12 includes a disk-shaped elastic partition film 15 made of a rubber film, and a cylindrical member 16 that accommodates the elastic partition film 15 and is received by a lattice wall 18 (corresponding to a first lattice member) between inner peripheral surfaces. And a lattice disc-shaped partition membrane displacement regulating member 17 (corresponding to the second lattice member) covering the opening on the upper end side of the cylindrical member 16. The lattice wall 18 restricts the amount of displacement of the elastic partition film 15 from the outer side of one surface of the elastic partition film 15, and the partition film displacement restricting member 17 operates from the outer side of the other surface of the elastic partition film 15. The amount of displacement of the elastic partition film 15 is regulated.

An orifice 25 that allows the first liquid chamber 11 </ b> A and the second liquid chamber 11 </ b> B to communicate with each other is formed between the outer peripheral surface of the cylindrical member 16 and the inner peripheral surface of the bottom metal 5. As shown in FIGS. 2, 3, 4 (b), and 4 (b), the orifice channel has two rounds around the axis O of the cylindrical member 16, and the upper one round orifice channel. It consists of R1 and an orifice channel R2 for one round on the lower side. These are partitioned by an orifice forming wall 22.

The upper first orifice flow path R1 communicates with the opening 19 (see FIG. 5) of the partition membrane displacement regulating member 17 via the notch 55, and the lower orifice flow path R2 is the opening 58 on the lower end side of the cylindrical member 16. It communicates with the second liquid chamber 11B via the (see FIGS. 1 and 4B).

As shown in FIGS. 5 and 6, the partition membrane displacement regulating member 17 includes a cylindrical portion 20 on the outer peripheral side, which is fitted on the upper end portion of the cylindrical member 16, and on the stepped portion 57 of the vibration isolation base 3 from above. It is accepted.

The lattice hole 54 of the partition membrane displacement regulating member 17 includes a center side lattice hole 54D and a plurality of lattice holes 54A, 54B, 54C arranged in three rows in the circumferential direction of the partition membrane displacement regulating member 17. The number of the lattice holes 54A in the inner row and the number of the lattice holes 54B in the middle row is four, and the number of the lattice holes 54C in the outer row is eight. Has been placed. The opening 19 is disposed on the outer peripheral edge side.

The lattice hole 54 of the lattice wall 18 also includes a lattice hole 54D on the center side and a plurality of lattice holes 54A, 54B, 54C arranged in parallel in three rows in the circumferential direction of the lattice wall 18. The pattern (number, shape, position of the lattice wall 18 around the axis O, etc.) is the same pattern as the partition film displacement regulating member 17 side.

As shown in FIGS. 7, 8, and 9, rib groups 50 having the same pattern project from both surfaces of the elastic partition film 15. The rib group 50 includes a plurality of annular first ribs 51 positioned concentrically with the axis O of the elastic partition film 15 and a plurality of second ribs 52 positioned radially with respect to the axis O. Consists of. The height dimension and rib width of each rib 51, 52 are set to be the same.

Among the plurality of first ribs 51, the first rib 51 having the smallest diameter is disposed on the axis O side of the elastic partition film 15, and the first rib 51 having the largest diameter is disposed on the outer peripheral edge side of the elastic partition film 15. Has been. A plurality of other first ribs 51 are arranged at regular intervals in the radial direction between the two (intermediate portion). Specifically, all the first ribs 51 are arranged at equal intervals in the radial direction of the elastic partition film 15.

A plurality of the second ribs 52 are distributed around the axis O of the elastic partition film 15 around the entire circumference of the elastic partition film 15, and a plurality of the second ribs 52 are arranged between the adjacent pair of first ribs 51. Are connected to the pair of first ribs 51 on both sides thereof.

A plurality of second ribs 52 adjacent to each other in the radial direction of the elastic partition film 15 are displaced in the circumferential direction of the elastic partition film 15. A plurality of second ribs 52 between a pair of adjacent first ribs 51 are equally arranged around the axis O of the elastic partition film 15 at the same angle.

With the above configuration, when the elastic partition film 15 collides with the lattice wall 18 or the partition film displacement regulating member 17 due to vibration, the first rib 51 and the second rib 52 easily absorb the impact, and the elastic partition film 15. Can be made to softly collide with the lattice wall 18 or the partition film displacement regulating member 17.

[Another embodiment]
[1] The pattern of the rib group 50 of the elastic partition film 15 is not limited to the above embodiment. For example, the number of second ribs 52 between a pair of adjacent first ribs 51 may be different from the number of second ribs 52 between another pair of adjacent first ribs 51. That is, as shown in FIG. 10, the number of the second ribs 52 between the pair of adjacent first ribs 51 is different between the radially outer side and the inner side with respect to the substantially central first rib 51A. The number of the second ribs 52 on the radially outer side (the number of the second ribs 52 between the pair of adjacent first ribs 51) is the number of the second ribs 52 on the radially inner side (the adjacent ones). The number of the second ribs 52 between the pair of matching first ribs 51 may be set larger.

[2] The deformation amount of the elastic partition membrane 15 is also included in the “displacement amount of the elastic partition membrane” in the claims.

[3] The present invention can also be applied to, for example, a liquid-filled vibration isolator provided between the engine and the vehicle body frame.

Vertical view of liquid-filled vibration isolator Plan view of cylindrical member Longitudinal front view of cylindrical member (A) is a side view of the cylindrical member, (B) is a front view of the cylindrical member. Plan view of partition membrane displacement regulating member Front view of partition membrane displacement regulating member Top view of elastic partition membrane Cross section of elastic partition membrane Enlarged cross-sectional view of essential parts of elastic partition membrane Plan view of elastic partition membrane of another embodiment

DESCRIPTION OF SYMBOLS 1 1st fixture 2 2nd fixture 3 Anti-vibration base | substrate 8 Liquid enclosure 9 Diaphragm 11A 1st liquid chamber 11B 2nd liquid chamber 12 Partition 15 Elastic partition film 17 2nd grid member 18 1st grid member 25 Orifice 50 Rib group 51 First rib 52 Second rib O Axle of elastic partition membrane

Claims (1)

A liquid enclosure is provided between the first fixture, the cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and the vibration isolating base attached to the second fixture. Forming a diaphragm, a partition body for partitioning the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side, and an orifice for communicating the first liquid chamber and the second liquid chamber And
The partition includes an elastic partition membrane, a first lattice member that regulates a displacement amount of the elastic partition membrane from the outer side of one surface of the elastic partition membrane, and an outer side of the other surface of the elastic partition membrane. A liquid-filled vibration isolator comprising a second lattice member that regulates the amount of displacement of the elastic partition membrane from the side,
Rib groups project from both sides of the elastic partition membrane,
The rib group includes a plurality of annular first ribs positioned concentrically with respect to the axis of the elastic partition membrane, and a plurality of second ribs positioned radially with respect to the axis.
A plurality of the second ribs are arranged around the axis of the elastic partition film over the entire circumference of the elastic partition film, and each of the plurality of first ribs is arranged between a pair of adjacent first ribs. Arranged at equal intervals in the radial direction of the elastic partition membrane,
The first ribs are disposed on the axial center side and the outer peripheral edge side of the elastic partition membrane, respectively, and a predetermined number of the first ribs are disposed in a radial intermediate portion of the elastic partition membrane,
The plurality of first ribs are arranged at equal intervals in the radial direction of the elastic partition membrane, and the plurality of second ribs are arranged uniformly at the same angle around the axis of the elastic partition membrane,
The plurality of second ribs adjacent in the radial direction of the elastic partition membrane are displaced in the circumferential direction of the elastic partition membrane,
Both ends of the plurality of second ribs displaced in the circumferential direction of the elastic partition membrane are connected to the pair of first ribs on both sides thereof, and the pair of first ribs adjacent in the radial direction of the elastic partition membrane; A gap that is surrounded by a pair of the second ribs adjacent in the circumferential direction of the elastic partition membrane and is adjacent in the radial direction of the elastic partition membrane is displaced in the circumferential direction of the elastic partition membrane,
When the elastic partition membrane collides with the first lattice member and the second lattice member, the first rib and the second rib are configured to be able to collide with each other softly by the gap. Anti-vibration device.

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