JP2005273689A - Liquid filled type vibration isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid filled type vibration isolation device achieving low dynamic spring constant at higher frequency range. <P>SOLUTION: This device is provided with a first fitting 1 and a cylindrical second fitting 2, a vibration isolation base body 3 which consists of rubber like elastic material connecting the first fitting 1 and the second fitting 2, a diaphragm 9 attached to the second fitting 2 to form a liquid filled chamber 8 between the vibration isolation base body 3, a partition body 12 partitioning the liquid filled chamber 9 to a first liquid chamber 11A on the vibration isolation base body 3 side and a second liquid chamber 11B on the diaphragm 9 side and an orifice 25 communicating the first liquid chamber 11A and the second liquid chamber 11B are provided. The partition body 12 consists of an elastic partition film 15 and a pair of grid members 33, 34 connected each other and regulating displacement of the elastic partition film 15 from both sides. The partition body 12 is elastically supported by the second fitting 2 via a elastic body 29 between an inner circumference part of the second fitting 2 and one of grid members 33, 34 on at least one end. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 body relates to a liquid-filled vibration isolator comprising an elastic partition film and a pair of interconnected lattice members that restrict the amount of displacement of the elastic partition film from both sides thereof.

  The liquid filled type vibration damping device is provided, for example, between an automobile engine and a body frame. When vibration with a small amplitude occurs, the liquid does not flow through the orifice between the first liquid chamber and the second liquid chamber, and the internal pressure (hydraulic pressure) of the first liquid chamber is the elastic partition membrane of the partition body. As a result, the elastic partition membrane is reciprocally deformed to absorb the internal pressure of the first liquid chamber and attenuate the vibration with a small amplitude. When large-amplitude vibration occurs and the internal pressure of the first liquid chamber reaches a predetermined value, the reciprocating deformation of the elastic partition membrane is restricted, and the liquid flows through the orifice and between the two liquid chambers. The vibration of large amplitude is attenuated by the liquid flow effect.

Conventionally, in the above-described liquid-filled vibration isolator, the pair of lattice members that support the elastic partition film are fixed to the inner peripheral portion of the second fixture [see Patent Document 1].
JP-A-6-221368

  According to the above conventional configuration, when vibration with a high frequency of, for example, about 100 Hz to 300 Hz is input, the elastic partition membrane can resonate to reduce the dynamic spring of the device, but the elastic partition membrane is reciprocally deformed. Because of the structure that only does this, when higher frequency vibrations are input, the displacement resistance of the elastic partition film is increased, and a low dynamic spring cannot be achieved.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a liquid-filled vibration isolator capable of achieving a low dynamic spring in a higher frequency range.

The present invention is characterized in that a first mounting tool, a cylindrical second mounting tool, a vibration isolating base made of a rubber-like elastic material connecting them, and a vibration isolating base mounted on the second mounting tool, A diaphragm for forming a liquid sealing chamber therebetween, a partition for partitioning the liquid sealing chamber into a first liquid chamber on the vibration isolation base side and a second liquid chamber on the diaphragm side, the first liquid chamber and the second liquid chamber An orifice for communicating the liquid chamber,
The partition body is a liquid-filled vibration isolator comprising an elastic partition membrane and a pair of mutually connected lattice members that regulate the amount of displacement of the elastic partition membrane from both sides thereof,
An elastic body is interposed between the inner peripheral portion of the second fixture and at least one lattice member, and the partition body is elastically supported by the second fixture.

  According to this configuration, the following effects can be achieved.

  When vibration with a small amplitude occurs, the liquid does not flow through the orifice between the first liquid chamber and the second liquid chamber, and the internal pressure (fluid pressure) of the first liquid chamber is transmitted to the elastic partition film, and the elastic partition film. Reciprocates in the axial direction with respect to the lattice member, absorbs the internal pressure of the first liquid chamber, and attenuates the vibration with a small amplitude. That is, as an example, when vibration with a high frequency of about 100 Hz to 300 Hz is input, the elastic partition membrane resonates as shown in FIG. FIG. 6 is a curve showing the relationship between the dynamic spring constant and the frequency, and shows a case where the elastic partition membrane resonates around 250 Hz and the dynamic spring constant decreases (point A in FIG. 6).

  And since the said partition is supported through the elastic body by the 2nd fixture, when the vibration of the higher high frequency of about 500 Hz-800 Hz more than that inputs it with respect to a 2nd fixture The partition body can be reciprocated to resonate, whereby a low dynamic spring can be achieved. FIG. 6 shows a case where the partition body resonates near 650 Hz and the dynamic spring constant decreases (point B in FIG. 6). The broken line in FIG. 6 shows the curve of the structure in which the lattice member is fixed to the inner periphery of the second fixture. In the structure in which the lattice member is fixed to the inner peripheral portion of the second fixture, the dynamic spring constant is increased.

  When a large amplitude vibration occurs and the internal pressure of the first liquid chamber reaches a predetermined value, the displacement of the partition (and the elastic partition film constituting the partition) is limited, and the liquid flows between the two liquid chambers through the orifice. To do. The vibration of large amplitude is attenuated by the liquid flow effect.

  In the present invention, a ring-shaped orifice forming member that forms the orifice between the inner periphery of the second fixture is provided on the inner periphery of the second fixture, and the at least one side lattice The member may be configured to be supported and connected to the inner peripheral portion of the orifice forming member via the elastic body.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid enclosure type vibration isolator which can achieve low dynamic spring in a higher high frequency range was able to be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a liquid-filled vibration isolator. This vibration isolator is a plate-like first mounting bracket 1 that is attached to an automobile engine via an upper mounting bolt 6 and a cylindrical shape that is attached to a vehicle body frame below the engine via a lower mounting bolt 6. The second mounting bracket 2 and an anti-vibration base 3 made of a rubber-like elastic material that connects them are provided.

  The second mounting bracket 2 includes a cylindrical metal fitting 4 having a circular cross section on which the vibration-proof base 3 is vulcanized and a bottom metal fitting 5 having a circular cross section. The anti-vibration base 3 is formed in a truncated cone shape, and the upper end surface thereof is vulcanized and bonded to the first mounting bracket 1 and the lower end portion thereof is vulcanized and bonded to the upper end opening portion of the tubular bracket 4 that extends upward. An upper constricted hollow portion is formed on the lower surface portion of the vibration isolating substrate 3, and a rubber film 7 covering the inner peripheral surface of the cylindrical metal fitting 4 is connected to the lower end portion of the vibration isolating substrate 3.

  A partial spherical diaphragm 9 made of a rubber film that forms a liquid sealing chamber 8 is attached to the second mounting bracket 2 between the lower surface of the vibration isolating base 3 and the liquid is sealed in the liquid sealing chamber 8. The diaphragm 9 is covered with the bottom metal fitting 5. And the partition body 12 which divides the liquid enclosure chamber 8 into the 1st liquid chamber 11A by the side of the vibration proof base 3 and the 2nd liquid chamber 11B by the side of the diaphragm 9, and the orifice which connects the 1st liquid chamber 11A and the 2nd liquid chamber 11B 25 is formed. As shown in FIGS. 2 to 5, the circular ring-shaped orifice forming member 30 is accommodated and fitted in the inner peripheral portion of the cylindrical metal fitting 4, and the lower support disc 14 and the lower ends of the vibration-isolating base 3 It is clamped and fixed to the side step portion 57 in the vertical direction. The orifice 25 is formed between the orifice forming groove 28 formed on the outer periphery of the orifice forming member 30 and the rubber film 7.

  The partition 12 includes a disk-shaped elastic partition film 15 (made of rubber) and a pair of upper and lower interconnected lattice members 33 and 34 that restrict the displacement of the elastic partition film 15 from both sides. One lattice member 34 (hereinafter referred to as “lower lattice member 34”) includes a seat 22 (see FIG. 2) as an accommodation recess for accommodating the elastic partition film 15, and the other lattice member 33 (hereinafter referred to as “upper lattice member 34”). It is fitted from the lower side into the cylindrical portion 20 formed on the lattice member 33 ").

  The outer periphery of the upper lattice member 33 is connected to the inner periphery of the orifice forming member 30 via a rubber-like elastic body 29. This rubber-like elastic body 29 is vulcanized and bonded to the outer peripheral portion of the upper lattice member 33 and the inner peripheral portion of the orifice forming member 30 over the entire periphery. That is, the rubber-like elastic body 29 is interposed between the inner peripheral portion of the second fixture 2 and the upper lattice member 33, and the partition 12 is elastically supported by the second fixture 2.

  As shown in FIGS. 3 and 4, both lattice members 33 and 34 each include a center hole 54 </ b> A and a plurality of arc-shaped lattice holes 54 </ b> B arranged in a plurality of rows in the circumferential direction. The lattice holes 54A, 54B of the upper lattice member 33 and the lattice holes 54A, 54B of the lower lattice member 34 are located at the same position and overlap when viewed in the axial direction (plan view) of the lattice members 33, 34. ing.

  The orifice 25 makes two rounds around the axis of the partition 12, communicates with the first liquid chamber 11 </ b> A through the notch 19, and communicates with the second liquid chamber 11 </ b> B through the opening 58 of the support disk 14. Yes. As shown in FIG. 1, the outer peripheral portion of the support disk 14, the mounting plate 10 on the outer peripheral portion side of the diaphragm 9, the flange 4 </ b> C on the lower end side of the cylindrical metal fitting 4, and the flange 5 </ b> C on the upper end side of the bottom metal fitting 5 Are fixed together by caulking.

[Another embodiment]
The present invention can also be applied to a liquid-filled vibration isolator provided between the transmission and the vehicle body frame.

Longitudinal section of liquid-filled vibration isolator Exploded longitudinal sectional view of partitions etc. Longitudinal sectional view of partitions, etc. Plan view of partitions etc. Front view of partitions, etc. Diagram showing the relationship between dynamic spring constant and frequency

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st fixture 2 2nd fixture 3 Anti-vibration base | substrate 8 Liquid enclosure chamber 9 Diaphragm 11A 1st liquid chamber 11B 2nd liquid chamber 12 Partition body 15 Elastic partition film 25 Orifice 29 Rubber-like elastic body 33 Grid member 34 Grid member

Claims (2)

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 body is a liquid-filled vibration isolator comprising an elastic partition membrane and a pair of mutually connected lattice members that regulate the amount of displacement of the elastic partition membrane from both sides thereof,
A liquid-filled vibration isolator in which an elastic body is interposed between an inner peripheral portion of the second fixture and at least one lattice member, and the partition is elastically supported by the second fixture.   A ring-shaped orifice forming member that forms the orifice between the inner periphery of the second fixture is provided on the inner periphery of the second fixture, and the lattice member on at least one side forms the orifice. The liquid-filled vibration isolator according to claim 1, wherein the liquid-filled vibration isolator is supported and connected to an inner peripheral portion of the member via the elastic body.

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