JPS6065928A - Liquid sealed vibrationproof device - Google Patents

Abstract

PURPOSE:To smoothly move a partition plate and thereby effectively absorb high frequency vibration while preventing scutting and abnormal sound from being generated by supporting a circumferential edge part of the partition plate between two fluid chambers on a cylinder wall connecting the both fluid chambers with each other via an elastic member. CONSTITUTION:A lower half part of a bottom plate 4 in a thick rubber elastic wall 1 serving to form the chamber wall of a first fluid chamber a is formed into a bent part 41, and a solenoid 5 is housed in said bent part 41. A thin rubber elastic wall 6 serving to form the chamber wall of a second fluid chamber B is provided in an internal cylinder formed by the bent part 41 so as to vertically divide said cylinder. A magnetic partition plate 7 is provided so as to partition the both fluid chambers A, B in the cylinder wall 42 of the bottom plate 4. In this case, an elastic rubber sheet 8 is joinned with an outer said sheet 8 is put between caulking parts of a side plate 3 and the bottom plate 4 via a ring plate 81.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a vibration isolating device for use in a vehicle engine mount, which includes a first fluid chamber made of a thick rubber elastic wall separated by a partition plate provided with a throttle hole, and a first fluid chamber made of a thick rubber elastic wall and a thin wall It has a second fluid chamber made of a rubber elastic wall, and when the first fluid chamber is deformed due to vibration, the enclosed liquid flows through the aperture hole of the partition plate, causing the J dragon to flow. This invention relates to a liquid-filled vibration isolator that has a vibration damping effect.

This type of liquid-filled vibration isolator has an excellent damping effect by attenuating low-frequency, large-amplitude vibrations such as cranking vibrations that occur when starting an engine by flowing sealing fluid through the throttle hole. It is something.

Incidentally, it is preferable that the vibration isolator for a vehicle has a so-called vibration isolating effect that absorbs vibrations and prevents transmission of high-frequency, small-amplitude vibrations higher than idling vibrations.

In addition, when a vehicle is running, in addition to the above-mentioned small-amplitude vibrations, large-amplitude shake vibrations occur due to road surface irregularities, etc., and the above-mentioned vibration isolator acts as a vibration-dampener against small-amplitude vibrations, and also acts as a damper for cranking vibrations. Similarly, it is preferable to have a damping effect to damp vibrations.

Therefore, conventionally, the above-mentioned sacrificial plate is made freely movable within a predetermined range, and the first plate deforms due to engine vibration.
Some devices are designed to absorb high-frequency, small-amplitude vibrations by relaxing the internal pressure of the fluid chamber, but the above-mentioned partition plates change their posture when they are moved, making smooth movement difficult, or when they are inserted. There was a risk that the cylindrical wall connecting the first and second partition chambers placed therein would come into contact and cause galling or abnormal noise.

The present invention has been made in view of these problems, and allows the movable partition plate to move smoothly while maintaining a predetermined posture, thereby effectively absorbing high-frequency vibrations and preventing galling and abnormal noise. It is an object of the present invention to provide a liquid-filled vibration isolator that does not cause vibrations and is also easy to assemble.

That is, the liquid-filled vibration isolator of the present invention has a structure in which the peripheral edge of the partition plate is supported by a deformable elastic member on the cylindrical wall connecting the first and second fluid chambers.

Therefore, the partition plate can smoothly move within a predetermined range in a direction to relieve the internal pressure of the first fluid chamber that deforms due to engine vibration.

-3- The present invention will be explained below with reference to illustrated embodiments.

In FIGS. 1 and 2, an upper plate 2 with a cross-sectional shape is embedded and fixed in the center of a thick rubber elastic wall 1 without the chamber wall of the first fluid chamber A, and a side plate is provided on the outer periphery. 3 is the joint.

A cylindrical bottom plate 4 is disposed below the side plate 3 to receive it, and both are connected at their lower and upper ends by caulking. The lower half of the bottom plate 4 is bent inward to have a U-shaped cross section, and the bent portion 41 houses an annular electromagnetic coil 5.

Furthermore, a thin rubber elastic wall 6 forming a chamber wall of the second fluid chamber B is provided in the inner cylinder formed by the bent portion 41 so as to divide the inner cylinder into upper and lower parts.

A partition plate 7 made of a magnetic material is disposed within the cylindrical wall 42 of the bottom plate 4 to partition both the fluid chambers A1B. A rubber elastic sheet 8 having a predetermined elasticity is bonded to the partition plate 7 along its outer periphery.
The outer circumferential edge of is clamped and fixed to the caulked portions of the side plate 3 and the bottom plate 4 via a ring plate 81 provided thereon. Thereby, the partition plate 7-4- can maintain a horizontal state without swinging from side to side, and can freely move in the vertical direction. The rubber elastic sheet 8 is provided with slits 82 at a plurality of locations to allow fluid to flow freely. Further, a stopper 11 is provided above the partition plate 7 to protrude from the cylindrical wall 42 of the bottom plate 4 in order to restrict its movement.

The partition plate 7 is provided with a cover member 9 having a large number of passages 91 formed on the upper surface of the central portion thereof. The cover member 9 is inserted into several holes at the lower end of the partition plate 7 and fixed by caulking. Inside the cover member 9 is a circular float 10.
A throttle hole 101 is provided in the center of the float 10 that projects upward. In addition, the partition plate 7
has a large number of through holes 71 at positions corresponding to the floats 10.
is formed.

The engine is mounted and fixed on the upper plate 2 by bolts 21 provided upright on the upper plate 2. The bolt 21 is also fitted with a stopper plate 12. The stopper plate 12 has a pair of opposite sides bent downward into a shape, and the bent portion 1
21 comes into contact with the bent portion 31 formed at the upper end -5- of the side plate 3, thereby restricting the amount of downward movement of the upper plate 2 due to engine vibration. The rotation of the stopper plate 12 is made rigid by a pin 22 provided on the upper plate 2.

The entire device is fixed to the vehicle body by inserting bolts into punch holes 33.44 formed in radially symmetrically extending flanges 32.43 of the side plates 3 and the bottom plate 4 so as to coincide with each other.

In the vibration isolating device having the above structure, when the engine is started, the electromagnetic coil 5 is energized to attract and fix the partition plate 7 thereto. If a large amplitude vibration due to cranking is input here, the float 10 whose vertical movement range is regulated by the cover member 9 and the partition plate 7 cannot alleviate the internal pressure change in the first fluid chamber A. The sealing fluid flows through the throttle hole 101 at high speed and is subjected to a large flow resistance, thereby quickly damping vibrations.

During idling, the electromagnetic coil 5 is de-energized.

As a result, the partition plate 7 moves up and down to alleviate the internal pressure change in the first fluid chamber, and as a result, the idling vibration is quickly absorbed. During this vertical movement, the partition plate 7 is supported by the rubber elastic sheet 8 on the cylindrical wall of the bottom plate 4, so that it always maintains a horizontal state without swinging from side to side. Therefore, the partition plate 7 operates smoothly without the outer periphery touching the cylindrical wall 42 of the bottom plate 4 and causing noise or galling.

When the vehicle is running, the electromagnetic coil 5 is energized again to fix the partition plate 7. Since the engine vibration during high speed rotation is much smaller than when idling, float 10 with a small travel distance is used.
Also, the internal pressure change in the first fluid chamber A is sufficiently alleviated,
Vibrations are absorbed.

Large-amplitude vibrations such as shakes that occur during running are quickly damped by flowing sealing fluid through the throttle hole 101 in the same manner as at the time of starting.

As described above, the liquid-filled vibration isolator of the present invention can effectively prevent the transmission of vibration from the low engine speed range to the high engine speed range.In particular, the peripheral edge of the partition plate 7 is covered with a rubber elastic sheet By supporting the partition plate 7 on the cylindrical wall 42 of the bottom plate 4 by means 8, the movement of the partition plate 7 during idling can be made smooth and vibrations can be effectively absorbed.

Furthermore, the device of the present invention has excellent assemblability.

That is, the thick rubber elastic wall 1, the top plate 2, and the side plate 3 form one set, the bottom plate 4, the electromagnetic coil 5, and the thin rubber elastic wall 6 form one set, and the partition plate 7 and the rubber elastic sheet 8 , the cover member 9 and the float 10 are assembled in advance as a set, and when the side plate 3 and the bottom plate 4 are caulked together, the outer periphery of the elastic sheet 8 is clamped to the caulked portion at the same time, and the device can be easily assembled. can be assembled, and the partition plate 7 can also be accurately positioned at this time.

Further, the stopper plate 12 only needs to be placed on the upper plate 2 by inserting the bolts 21 therein before placing the engine thereon.

As described above, the vibration isolating device of the present invention effectively prevents the transmission of engine vibration in all driving conditions of the vehicle, improves the comfort and driving performance of the vehicle, and is easy to assemble. It also has excellent properties.

-8-

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of the device, a sectional view taken along line II in FIG. 2, and FIG. 2 is a plan view of the device viewed from above. 1...Thick rubber elastic wall 42...
・Cylinder wall 5... Electromagnetic coil 6... Thin rubber elastic wall 7...
Partition plate 8 Elastic member 101 Throttle hole A First fluid chamber B・Second fluid chamber-9- 11th! I

Claims (1)

[Claims] The first chamber wall is a thick rubber elastic wall that supports the engine.
a second fluid chamber having a thin rubber elastic wall as a chamber wall, and a cylindrical wall that connects the two fluid chambers so as to partition the two fluid chambers, and a sealing fluid is provided between the two fluid chambers. In a liquid-filled vibration damping device, the peripheral edge of the partition plate is supported on the cylindrical wall by a deformable elastic member, and the liquid-filled vibration isolator is equipped with a partition plate having a restricting hole that allows the flow of water with high resistance. A liquid-filled vibration isolator characterized in that it is movable within a predetermined range in a direction to relieve the internal pressure of a deforming first fluid chamber.