JPH0756314B2 - Anti-vibration device - Google Patents

Description

Description: [Industrial application] The present invention relates to a vibration damping device that is interposed between a vibration generating portion and a vibration receiving portion to absorb and attenuate vibration.

[Background Art and Matters to be Solved] A vibration isolation device is used in which a liquid is injected into a hollow body made of an elastic material, and the liquid is divided into a plurality of small liquid chambers via a restriction passage. In this vibration isolator, the liquid is moved between the liquid chamber and the other liquid chamber by the vibration applied to the one liquid chamber, and the vibration is absorbed by the resistance generated in the limiting passage.

However, in such a vibration isolator, the limiting passage is clogged during high frequency vibration and the dynamic magnification increases, so that the vibration absorption characteristics at high frequencies are low. Therefore, when this vibration isolator is used as an engine mount, Will cause the ride quality of the car to deteriorate.

For this reason, conventionally, there has been proposed an anti-vibration device in which a diaphragm that divides the liquid chamber is provided with a vibration plate capable of microvibration (as an example, Japanese Utility Model Laid-Open No. 57-170071). In this vibration isolator, the volume of the liquid chamber can be changed by the vibration of the diaphragm even after the restriction passage is clogged at the time of high frequency vibration, and the dynamic magnification is reduced.

However, even the vibration isolator having such a vibration plate has a problem that the dynamic magnification increases at the time of vibration with a large amplitude and the vibration absorption characteristic deteriorates.

For this reason, the applicant has already proposed an anti-vibration device that does not increase the dynamic magnification at low frequencies when vibrating with a large amplitude (Japanese Patent Application No. 59-187360).

In consideration of these facts, the present invention does not increase the dynamic magnification at a low frequency when a large-amplitude vibration is generated even if the vibration isolator has a restricted passage, and the elastic partitioning member used for the vibration isolator can be attached. The purpose is to obtain a reliable anti-vibration device.

[Outline and Action of the Invention] The present invention is a vibration damping device which is interposed between a vibration generating part and a vibration receiving part and in which a hollow chamber mainly composed of a hollow body made of an elastic material is used as a liquid chamber. A first mounting member connected to a part of the vibration absorbing body and connected to either one of the vibration generating part and the vibration receiving part, and a vibration generating part and a vibration receiving part connected to another part of the vibration absorbing body. A second mounting member connected to the other of the two parts, the first mounting member and the second mounting member.
Rigidly connected to one of the mounting members and elastically connected to the other of the first mounting member and the second mounting member via a part of the hollow body. A partition plate that divides the chamber into a plurality of small liquid chambers, a restriction passageway that connects the small liquid chambers by forming a passage wall surface by at least the partition plate, and the center of the portion of the partition plate that faces the liquid chambers And an elastic partition member that closes the opening by increasing the mounting area by making the mounting portion mounted near the inner peripheral portion of the opening into a bent shape.

Therefore, in the present invention, in order to partition the liquid chamber, the elastic partition member suppresses the volume change when the internal pressure of one of the liquid chambers increases even when the restriction passage is clogged, thereby reducing the dynamic magnification. The elastic partition member is securely mounted by the bent mounting portion to cope with a large load and avoid stress concentration.

[Embodiment of the Invention] FIG. 1 shows a vibration isolator according to a first embodiment of the present invention, which is an embodiment applied to an engine mount of an automobile.

A bolt 12 is fixed to the lower central part of the base plate 10 so as to be fixed to the body of an automobile (not shown). A flange 14 is integrally formed on an upper end portion of a cylindrical portion 10A that is erected from the periphery of the base plate 10, and a partition plate 16 is fixed. A diaphragm 18 is sandwiched and fixed between the partition plate 16 and the flange 14,
An air chamber is provided between the diaphragm 18 and the base plate 10.

Further, the lower end of the cylindrical rubber 20 that mainly constitutes the vibration absorber is vulcanized and adhered to the upper portion of the partition plate 16. A top plate 22 is vulcanized and adhered to an upper end portion of the rubber 20, and a bolt 24 protruding from the top plate 22 is used for fixing an engine (not shown).

A liquid is filled in a hollow portion formed by the top plate 22, the rubber 20, and the diaphragm 18 to form a liquid chamber 26.

As shown in FIG. 2, the partition plate 16 is provided with a circular hole 28 at the center thereof, and the upper end of a sleeve 30 is integrally connected to the periphery of the circular hole 28. The outer peripheral portion of the elastic partition member 32 is vulcanized and adhered to the inner peripheral portion of the sleeve 30. The elastic partition member 32 has a disk shape and is preferably made of an elastic body such as rubber which can be bent by a certain amount.

Here, a part of the inner peripheral surface of the sleeve 30 is a bent portion 33 protruding in a ring shape in the inner diameter reducing direction. Therefore, the elastic partition member 32 whose outer peripheral surface is attached to the bent portion 33 has the bent portion 33.
It has a large contact area with and has great strength. It is preferable that the elastic partition member 32 be gradually separated from the bent portion 33 and gradually become thinner toward the central portion.

Thus, the partition plate 16 partitions the liquid chamber 26 together with the elastic partition member 32 into an upper liquid chamber 26A and a lower liquid chamber 26B.

A contact plate 34 is fixed to the lower portion of the partition plate 16. A cylindrical sleeve 36 is integrally projected from the inner peripheral portion of the contact plate 34 and fixed to the outer periphery of the sleeve 30. Abutment plate
A rectangular concave groove 38 is formed in the connecting portion between the sleeve 34 and the sleeve 36 over approximately the two-thirds circumference of the sleeve 36. For this reason, an orifice 40, which is a restricted passage, is provided between the partition chamber 16, the sleeve 30 and the contact plate 34, and the sleeve 36. The orifice 40 has a circular hole 42 formed at the partition plate 16 at one end, The upper liquid chamber 26 is provided with a circular hole 44 whose end is formed at the bottom of the groove 38.
A is communicated with the lower liquid chamber 26B.

Next, the operation of this embodiment will be described.

If the base plate 10 is fixed to the vehicle body of an automobile (not shown) through the bolts 12, and the engine is mounted on the top plate 22 and the bolts 24 are fixed, the assembly is completed.

The engine vibration is absorbed by the internal friction generated in the rubber 20, but when the vibration frequency is low, the vibration is generated by the resistance of the liquid flowing through the orifice 40 in the upper liquid chamber 26A and the lower liquid chamber 26B. Be absorbed.

When the vibration frequency is high, the orifice 40 becomes clogged, but the elastic partition member 32 bends by a predetermined amount and moves toward the upper liquid chamber 26A or the lower liquid chamber 26B to absorb the pressure increase. Vibration can be absorbed by.

Further, in this embodiment, since the elastic partition member 32 is used, the liquid chamber after the orifice 40 is clogged.
The volume elasticity of 26A (the reciprocal of the changed volume of the upper liquid chamber 26A when the internal pressure of the upper liquid chamber 26A is increased by a unit internal pressure) can be kept low, and the dynamic magnification is 2 or less even with large amplitude vibration. It is possible to

Even when the elastic partition member 32 is deformed as described above, since the elastic partition member 32 is vulcanized and bonded to the sleeve 30 over a wide area via the bent portion 33, a large stress is concentrated on the mounting portion to the sleeve 30. The durability can be improved.

FIG. 3 shows a vibration damping device according to a second embodiment of the present invention.

In this embodiment, after the inner peripheral edge of the partition plate 16 is once bent in the axial direction, it is bent in the axial direction of the circular hole 28,
This bent portion is a semicircular bent portion 46 having a cross-sectional shape and a downward concave shape.

On the other hand, the sleeve 45 abutting against the inner circumference of the sleeve 36
The upper end portion of this corresponds to this semi-circular bent portion 46, and is a semi-circular bent portion 48 that is concave upward.

Further, the elastic partition member 32 has a thicker outer peripheral portion than the central portion, and the outer peripheral portion is a bulging portion 32A having a circular cross section.

Therefore, if the elastic partition member 32 is vulcanized and adhered to the semicircular bent portions 46 and 48, the elastic partition member 32 is securely attached to the partition plate 16 and the sleeve 45, and the elastic partition member 32 is attached to the orifice 40. A part of it is blocked.

Therefore, also in this embodiment, the elastic partition member 32 is firmly attached as in the above-described embodiment, and the same effect can be obtained.

Next, FIG. 4 shows a vibration isolator according to a third embodiment of the present invention.

In this embodiment, unlike the above-mentioned embodiments, the sleeve 30 is projected upward from the partition plate 16, the upper end of the sleeve 30 is bent in the axial direction, and the tip is bent at a right angle to stand upright. It is 51.

Further, the outer periphery of the contact plate 34 is fixed to the partition plate 16, and
An orifice 40 is formed between 30 and this contact plate.
The shaft center of 34 is closed by a lid 53. The lid member 53 has a plurality of small holes 55 formed therethrough.

The vicinity of the outer peripheral portion of the elastic partition member 32 is vulcanized and adhered to the bent portion 51, and the central portion of the elastic partition member 32 is separated from the lid member 53, and this lid member 53 is deformed in the direction of the lower liquid chamber 26B. The movement amount is limited by contacting with.

Therefore, in this embodiment, the elastic partition member 32 is limited in the amount of movement in the downward direction by the lid member 53, and is bonded to the bent portion 51 over a large area when it is moved in the upward direction. Has a large mounting strength.

A part of the outer periphery of the elastic partition member 32 is inserted between the inner side of the sleeve 30 and the outer periphery of the contact plate 34, so that the contact plate 34 and the sleeve
It closes between 30 and.

Next, FIG. 5 shows a fourth embodiment of the present invention.

In this embodiment, the bent portion 51 of the third embodiment is a bent portion 57 which is inverted in a semicircular shape in cross section, and the elastic partition member 32 is fixed more firmly than in the embodiment. Therefore, this embodiment is suitable for the case where the inner peripheral portion of the contact plate 34 does not have the lid member 53 as in the above-mentioned embodiment, and the elastic partition member 32 directly faces the lower liquid chamber 26B.

[Advantages of the Invention] As described above, in the vibration damping device according to the present invention, the first attachment member connected to a part of the vibration absorbing main body and connected to one of the vibration generating portion and the vibration receiving portion, and the vibration absorbing main body. A second mounting member that is connected to the other part of the vibration generating portion and the vibration receiving portion, and is rigidly connected to one of the first mounting member and the second mounting member. And a partition plate that is elastically connected to the other of the first mounting member and the second mounting member via a part of the hollow body and divides the liquid chamber into a plurality of small liquid chambers, and at least a partition wall. A limiting wall that connects the small liquid chambers by forming a passage wall surface by the plate, an opening formed in the center of a portion of the partition plate facing the liquid chamber, and a mounting portion mounted near the inner peripheral portion of the opening. An elastic partition member that increases the mounting area as a bent shape and closes the opening, Therefore, the dynamic spring constant at the time of large-amplitude vibration can be reduced, and there is an excellent effect that durability can be improved without concentrating a large stress on the elastic partition member.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a vibration isolator according to the present invention, and FIG. 2 is an exploded perspective view showing components for forming the orifice of FIG. 1 (a partition member 32 is not shown), FIG. 3 is a sectional view showing a second embodiment of the present invention, FIG. 4 is a sectional view showing a third embodiment of the present invention, and FIG. 5 is a sectional view showing a fourth embodiment of the present invention. 16 ... Partition plate, 20 ... Rubber, 26 ... Liquid chamber, 26A ... Upper liquid chamber, 26B ... Lower liquid chamber, 28 ... Circular hole, 30 ... Sleeve, 32 ... Elastic partition member, 32A …… Bulging part, 33, 51, 57 …… Bending part, 40 …… Olyphus, 46,48 …… Semi-circular bending part.

Claims (1)

[Claims] 1. A vibration generator and a vibration receiver, which are interposed between the vibration generator and the vibration receiver.
A vibration-isolating device, in which a hollow chamber mainly composed of a hollow body made of an elastic material is filled with a liquid chamber, and is connected to a part of the vibration-absorbing main body and is connected to either one of a vibration generating part and a vibration receiving part. A first mounting member, a second mounting member connected to the other part of the vibration-absorbing main body and connected to the other of the vibration generating part and the vibration receiving part, the first mounting member and the first mounting member Rigidly connected to one of the two mounting members and elastically connected to the other of the first mounting member and the second mounting member via a part of the hollow body, A partition plate that divides the liquid chamber into a plurality of small liquid chambers; a restriction passageway that connects at least the small liquid chambers by forming a passage wall surface by at least the partition plate; and a portion of the partition plate that faces the liquid chambers. An opening formed in the center and attached near the inner circumference of the opening. That increases the mounting area of the mounting portion as a bent shape, vibration damping device is characterized in that and an elastic partition member closing the opening.