JPH039540Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> The disclosed technology is applicable to automobile bodies, engines,
Alternatively, it belongs to the technical field of vibration isolators installed at joints with power transmission devices and the like.

<Summary of the gist> In this invention, a rubber-like elastic body is interposed between the body and the seat, and the rubber-like elastic body is
This invention relates to a vibration isolator for a vehicle, which is provided with a partition wall that forms a damper liquid chamber for sealing damper liquid and has an orifice in the damper liquid chamber. A communicating pin is inserted into the damper liquid chamber, and an engaging flange is provided at the communicating end of the communicating pin, and the partition wall is formed of a rubber-like elastic material, and the partition wall has a connection pin between the body and the seat. This invention relates to a vibration isolator for a vehicle, which is provided with a communication port that is set to engage and seal with the engagement flange in response to displacement.

<Prior Art> As is well known, a vibration isolator is installed at the joints between the body and the chassis of an automobile, and the vibration isolator damps and absorbs various vibrations applied to the body and the chassis. is being used.

Conventionally, this type of vibration isolator has been constructed by interposing an elastic body such as rubber at a joint between the body and the chassis, and absorbing vibrations by the elastic body, or
It was supposed to be attenuated.

Specifically, as shown in FIGS. 5 and 6, an inner cylinder 1 provided on one side of the body or the chassis
An elastic rubber 3 such as natural rubber or styrene-butadiene rubber is interposed between the inner cylinder 1 and the elastic rubber 3, and the elastic rubber 3 and the outer cylinder 2. are fixed to each other by means such as vulcanization adhesive, and the shear force of the elastic rubber 3 is applied to vertical vibrations, and the compressive force and tensile force of the elastic rubber 3 is applied to horizontal vibrations. They were each supported and attenuated and absorbed.

Generally, in order to improve the vibration absorption effect of this type of vibration isolator, it is conceivable to reduce the spring constant of the elastic body used.

However, when the spring constant of the elastic body is reduced, it is effective against high-frequency or medium-frequency vibrations during general driving, but it is effective against low-frequency vibrations such as when starting, driving on rough ground, and changing gears. In response to vibrations, the amount of displacement due to the deformation of the elastic body itself becomes large, which tends to increase the shaking of the vehicle during driving, resulting in poor handling stability and ride comfort.

Conventionally, in order to suppress large swings of the vehicle, a rubber-like elastic body is interposed between the body and the seat, and a stopper is provided that engages with a set amount of relative displacement between the body and the seat. , many vibration isolators have been adopted that regulate the vibration stroke to a predetermined value.

<Problems to be solved by the invention> However, the above-mentioned conventional vibration isolating device that combines a rubber-like elastic body with a small spring constant and a stopper does not smoothly damp and absorb high-frequency and medium-frequency vibrations. However, when low-frequency vibrations, especially large loads such as when the vehicle starts, are instantaneously applied, the installed stopper hits the stopper hard and not only generates noise and vibration, but also causes vibration-proofing. There was a possibility that the equipment itself would malfunction.

Therefore, in order to deal with this problem in recent years,
Combining a rubber-like elastic body with a small spring constant and a damper device as disclosed in Publication No. 168034,
A vibration isolating device has also been developed in which high-frequency or medium-frequency vibrations are absorbed by a rubber-like elastic body, and low-frequency vibrations are attenuated by a damper device.

However, in the vibration isolating device disclosed in Japanese Utility Model Application Publication No. 59-168034, in order to improve the damping effect in the damper device portion, the hole diameter of the orifice portion must be reduced; In this case, there was a drawback that the orifice part was easily clogged.

The purpose of this invention is to solve the problems of the vehicle vibration isolator based on the above-mentioned conventional technology as a technical problem to be solved.
In addition to covering a wide vibration range from high frequencies to low frequencies, the damping force is gradually increased to perform soft vibration damping when a large instantaneous load is applied, improving vehicle handling stability. ,
It is also an object of the present invention to provide an excellent vehicle vibration isolator that improves comfort and benefits the field of vibration technology application in the automobile industry.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is based on the above-mentioned claims for utility model registration, is to provide a damper between the body and the seat in order to solve the above-mentioned problem. A rubber-like elastic body forming a liquid chamber is interposed, a communicating pin communicating with the damper liquid chamber is attached to either the body or the chassis, an engaging flange is provided at the tip of the pin, and the damper liquid A partition wall formed of a rubber-like elastic body and having an orifice is provided in the room, and the partition wall further includes a communication port that engages with the engagement flange and is sealed when the body and the chassis are displaced by a set amount. When high-frequency and medium-frequency vibrations are applied, they are absorbed by the rubber-like elastic body forming the damper liquid chamber, and when low-frequency vibrations and large shocks are applied, the engaging flange at the tip of the communicating pin absorbs them. blocks the communication port in the partition wall, and the sealed damper liquid flows to the other chamber side through the orifice.At the same time, the orifice moves in the direction opposite to the flow direction of the damper liquid due to the deformation of the partition wall, and As a result, technical measures have been taken to increase the relative flow overvelocity with respect to the orifice and dampen vibrations by the strong damping force that increases accordingly.

<Embodiment - Configuration> Next, one embodiment of this invention will be described based on FIG. 1 as follows.

Incidentally, the same parts as those in the conventional mode shown in FIGS. 5 and 6 will be described with the same reference numerals.

4 is a vibration isolator for a vehicle according to this invention, and shows an aspect of the vehicle at a differential suspension portion of a four-wheel independent suspension system.

Reference numeral 5 denotes a member connected to a differential carrier (not shown), and the member 5 has an annular hole communicating in the vertical direction, and a joining flange 6 is provided at the inner edge of the hole. At the same time, a cylindrical holder 7 is welded and fixed to the inside of the joining flange 6.

Furthermore, the holder 7 is threadedly fitted to a casing 8, which has a threaded groove on its inner surface and a threaded outer peripheral surface.

Furthermore, the casing 8 consists of a cylindrical part 9 that is screwed into the holder 7, and an end plate 10 that is closely fixed to the lower end of the cylindrical part 9. On the inner surface of the cylindrical part 9, cylindrical adhesive plates 11, 11 are provided. installed,
A rubber film 12 is attached to the upper surface of the end plate 10.

Further, an integral elastic rubber 13 serving as a partition wall is vulcanized and bonded to the inner peripheral surface of the lower adhesive plate 11, and a metal communication port 14 is vulcanized and bonded in the center of the elastic rubber 13. At the same time, a metal cylinder 25 serving as an orifice is similarly vulcanized and bonded to the setting portion.

The elastic rubber 13 serving as the partition wall is curved in a concave manner on both upper and lower surfaces, and the spring constant near the center is set to be sufficiently small.
In addition, the communication port 14 in the center of the elastic rubber 13
An upper flange 15 extending in the inner diameter direction is integrally molded on the upper end of the cylindrical portion to form a reduced diameter opening at the upper end of the cylinder, and a lower flange 16 extending in the inner radial direction is screwed onto the lower end of the cylinder. It is fixed and the lower end has a reduced diameter opening similar to the upper end.

On the other hand, 17 is the body, and on the underside,
The communicating pin 19 is supported and fixed via the bolt 18, and a stopper rubber 20 corresponding to the setting portion of the member 5 is vulcanized and bonded to the communicating pin 19.
Elastic rubber 3' as a vibration absorber is placed on the outer periphery of the
is glued, and its outer periphery is attached to the plate 11'
is glued to.

Note that, like the elastic rubber 13 serving as the damper liquid chamber, the upper and lower surfaces of the elastic rubber 3' are appropriately curved in a concave shape, and the spring constant near the center thereof is set to be sufficiently small. There is.

Furthermore, an engagement flange 21 covered with a rubber film is screwed onto the tip of the communication pin 19 and interposed between the upper flange 15 and the lower flange 16 of the communication port 14 .

Further, a damper liquid 22 such as silicone oil and a set amount of air 23 are sealed inside the sealed space surrounded by the casing 8 and the elastic rubber 3'.
It forms a damper liquid chamber.

<Embodiment - Effect> When a vehicle equipped with the above-mentioned vibration isolating device 4 is driven, the body 17 and the chassis (member 5) of the vehicle may be affected by the traveling speed, road conditions, etc. Relative vibration occurs in all vibration regions.

When a vehicle runs at medium to high speeds, vibrations in the high-frequency and medium-frequency ranges occur between the body and the chassis.
The elastic rubber 3' interposed between the body and the casing 8 on the member 5 side absorbs vibration energy by its internal friction through its small spring constant, so that the minute vibration between the body and the seat is Relative motion is suppressed, allowing comfortable and quiet driving.

Also, when the vehicle is running at low speed or on rough terrain,
When changing a shift, etc., vibrations in the low frequency range occur between the body and the chassis, but in this case,
The communicating pin 19 on the body 17 side swings vertically or horizontally, and when swinging vertically, the engaging flange 21 at the tip of the communicating pin 19 is provided on the elastic rubber 13 as a damper liquid chamber. The elastic rubber 13 is engaged with the upper flange 15 or the lower flange 16 of the communication port 14 to close the opening and deform the elastic rubber 13, thereby generating a pressure difference in the damper liquid chamber and directing the damper liquid 22 to the orifice. At the same time, the metal cylinder 25 is moved relative to the flow direction, and vibration damping is achieved with its large flow resistance.On the other hand, when swinging in the horizontal direction, The outer side of the engagement flange 21 of the communication pin 19 engages with the inner wall of the communication port 14, and the elastic force of the elastic rubber 13 serving as a partition wall damps and absorbs vibrations.

Furthermore, since a predetermined amount of air 23 is sealed in the upper part of the damper liquid chamber, it is possible to expand and contract the volume of the damper liquid chamber. liquid 22
Vibration damping is achieved by the metal cylinder and the metal cylinder.

Further, when a large load is applied between the body and the seat, the stopper rubber 20 bonded to the lower surface of the body 17 engages with a set portion on the upper surface of the member 5, thereby supporting and regulating vibration. Ru.

Further, since the holder 7 and the casing 8 are screwed together, smooth replacement work is possible when replacing parts.

<Other Embodiments> The embodiment of this invention is of course not limited to the above-mentioned embodiments, and as shown in FIGS. 2 and 3, the engagement flange 21' at the tip of the communicating pin 19 It is formed into a rectangular shape, and a rectangular hole 24, which is slightly larger than the engagement flange 21', is formed on the lower surface of the communication port 14', so that the engagement flange 21' can be easily inserted from the lower surface of the communication port 14' when the engagement flange 21' is installed.
A mode in which it can be fixed by screwing, or a mode in which the communication port 14'' is interposed between the tip of the communication pin 19' and the engagement flange 21'' as shown in FIG. 4, etc. Various aspects of this can be adopted.

<Effects of the invention> As described above, according to this invention, it is possible to reliably absorb or attenuate various vibrations in a wide range from high frequencies to low frequencies, and at the same time This enables soft and smooth damping absorption even when a large load is applied to the vehicle, and has the excellent effect of improving the handling stability and comfort of the vehicle.

That is, a rubber-like elastic body that forms a damper fluid chamber is interposed between the body and the chassis, and a communicating pin that communicates with the damper fluid chamber is attached to either the body or the chassis, and the tip of the pin an engaging flange is provided in the damper liquid chamber, and a partition wall formed of a rubber-like elastic body and having an orifice is provided in the damper liquid chamber.
Furthermore, by providing a communication port on the partition wall that engages and seals with the engagement flange when the body and the chassis are displaced by a set amount, the damper The rubber-like elastic body that forms the liquid chamber absorbs the liquid, and when low-frequency vibrations or large shocks are applied, the engaging flange at the tip of the communication pin closes the communication port on the partition wall and drains the sealed damper liquid. At the same time as the flow is caused to flow to the other chamber side through the orifice, the orifice is displaced in a direction relative to the flow direction of the damper liquid due to the deformation of the partition wall, and as a result, the relative flow overvelocity of the damper liquid with respect to the orifice is increased. The damping force that increases accordingly has the excellent effect of enabling smooth and reliable vibration damping.

Furthermore, even when a stopper is interposed between the body and the chassis to restrict large vehicle vibrations, the damper action increases or decreases as appropriate in response to the relative displacement speed between the body and the chassis. An excellent effect is achieved in that the stopper does not collide violently and noise and vibrations from being generated due to the stopper collision can be prevented.

Furthermore, the damper action can be adjusted by increasing or decreasing the displacement width of the orifice part of the partition wall, without expanding or contracting the orifice hole diameter, which has the excellent effect of eliminating the fear of clogging due to orifice hole diameter reduction. It is played.

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams of embodiments of this invention. Figure 1 is a sectional view of one embodiment, Figure 2 is a partial sectional view of another embodiment, and Figure 3 corresponds to Figure 2. 4 is a partial sectional view of another embodiment, 5th and 6th
The figures are explanatory diagrams of the conventional mode, with FIG. 5 being a longitudinal sectional view and FIG. 6 being a cross-sectional view taken from FIG. 5. 17... Body, 5... Seat, 3'... Rubber-like elastic body, 25... Orifice, 13... Partition wall, 4... Vibration isolator, 18... Communication pin, 21...
...Engagement flange, 14...Communication port.

Claims (1)

[Scope of utility model registration request] In a vehicle vibration isolator in which a rubber-like elastic body interposed between a body and a seat forms a damper liquid chamber, and a partition wall having an orifice in the formed damper liquid chamber is provided, the damper liquid chamber A communicating pin protruding from the body and the chassis is provided with an engaging flange at its tip, while the partition wall is formed of a rubber-like elastic material and is connected to the engaging flange on the partition wall. A vehicle vibration isolator characterized by being provided with a communication port that can be freely connected and closed.