JPH0515632Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an actuator mounting structure of a variable damping force type hydraulic shock absorber.

BACKGROUND ART As a hydraulic shock absorber used in an automobile suspension, a so-called variable damping force hydraulic shock absorber, which can adjust the damping force of the hydraulic shock absorber according to the driving conditions of the automobile, is known. (e.g. Jitsukaiaki)
61-66240).

This is because when the piston, which divides the cylinder of the hydraulic shock absorber body filled with hydraulic fluid into two liquid chambers, moves inside the cylinder, the hydraulic fluid flows through the damping force generation mechanism provided in the piston. A damping force is generated by displacing and circulating between each liquid chamber. On the other hand, there are two
A variable damping force mechanism is provided that forms a bypass passage between the two fluid chambers, and the adjuster of this variable damping force mechanism is driven by an actuator attached to the vehicle body mounting portion of the piston rod via a substantially U-shaped bracket. The damping force generated by the hydraulic shock absorber is adjusted by adjusting the bypass amount of the working fluid that exchanges between the fluid chambers.

Problems to be Solved by the Invention However, in conventional variable damping force hydraulic shock absorbers, the extension stroke (the piston rod extends, the piston moves upward in the cylinder, and the hydraulic shock absorber A damping force is generated by the hydraulic fluid during the pressure stroke (the piston rod is compressed, the piston moves downward in the cylinder, and the vertical length of the hydraulic shock absorber is shortened). This produces operating noise that passes through the damping force variable mechanism. Moreover, the actuator bracket is formed into a substantially U-shape and is placed on the inside of the vehicle. As a result, there is a problem in that the operating noise is transmitted through the piston rod and is propagated into the vehicle interior from the open space of the bracket.

Means for Solving the Problems In order to solve these problems, the present invention provides a bracket in which a flange is formed on the outside of the upper opening periphery of a bottomed cylinder, and a covered cylinder superimposed under the bracket. The lower inner cylinder formed on the body and the outer cylinder for mounting on the vehicle body side formed on the cylindrical body with both ends open are joined together with an insulator rubber, and the inner edge of the insulator rubber is connected to the flange of the bracket. A through hole is formed in the overlapping portion of the bracket and the lower inner cylinder, and a piston rod of a variable damping force type hydraulic shock absorber is passed through this through hole. It is fastened to the overlapping part of the bracket and the lower inner cylinder, and the output shaft of the actuator for variable damping force is fitted to the control rod for variable damping force in this piston rod so as to be able to rotate synchronously, and this actuator is connected to the above-mentioned bracket. The insulator rubber is overlaid onto the extended portion of the insulator rubber wrapped around above the flange of the insulator, and is screwed to the flange of the bracket, the upper opening of the bracket is sealed with the actuator, and the bracket and actuator form a sealed space. has been formed.

Operation During the extension stroke and pressure stroke of the variable damping force type hydraulic shock absorber, the operating sound of the hydraulic fluid passing through the damping force generation mechanism and the damping force variable mechanism is transmitted to the piston rod of the variable damping force type hydraulic shock absorber. After propagation, the air tries to propagate into the vehicle interior through the sealed space formed by the bracket and actuator, but during the propagation process from this sealed space into the vehicle interior, the actuator, bracket, and insulator rubber are It is significantly damped by the extension of the insulator rubber. Moreover, since the extending portion of the insulator rubber is interposed between the actuator and the flange of the bracket, the sealing performance of the sealed space is extremely high. Therefore, the above operating noise is blocked in the sealed space,
Airborne propagation of operating noise into the vehicle interior is prevented.

Furthermore, since a sealed space is formed between the bracket and the actuator, a lid is not required to form the sealed space.

Moreover, the connecting portion between the bracket and the piston rod of the variable damping force type hydraulic shock absorber, and the connecting portion between the output shaft of the actuator and the control rod of the variable damping force mechanism can be housed in the sealed space.

Embodiments First Embodiment FIG. 1 shows the structure of an actuator mounting part of a variable damping force hydraulic shock absorber according to a first embodiment.

In Fig. 1, a variable damping force hydraulic shock absorber 1
is equipped with a cylinder 2 filled with hydraulic fluid. A piston 5 that defines the interior of the cylinder 2 into two liquid chambers 3 and 4 is housed in the cylinder 2 so as to be movable up and down. The piston 5 is provided with a damping force generating mechanism 6 that generates a damping force when the piston 5 moves within the cylinder 2.

The damping force generating mechanism 6 includes a plurality of passages 6a that are arranged in the piston 5 at intervals in the circumferential direction and penetrate in the vertical direction, and at least one of the plurality of passages 6a that are provided on the upper surface of the piston 5. A slit 6b that communicates with the liquid chamber 3; a slit 6c that is provided on the lower surface of the piston 5 and allows at least one other of the plurality of passages 6a to communicate with the liquid chamber 4; The piston 5 includes an expansion side valve body 6d that covers the passages 6a, and a pressure side valve body 6e that is arranged on the upper surface of the piston 5 and covers the plurality of passages 6a. The plurality of passages 6a are communicated with each other by an orifice (not shown).

Piston rod 7 with piston 5 attached
A variable damping force mechanism 8 is provided on the lower end side of the damping force variable mechanism 8.
The damping force variable mechanism 8 includes a bypass passage 9 bored inside the piston rod 7 and communicating the two liquid chambers 3 and 4 by bypassing the damping force generating mechanism 6. A regulator 10 is accommodated in the bypass passage 9. The regulator 10 has a bypass passage 9
A plurality of orifices 11 with different hole diameters are formed to select the amount of bypass liquid to pass through. A control rod 12 within the piston rod 7 is connected to the upper end of the regulator 10. An output shaft 13a of an actuator 13 for variable damping force is fitted into the upper end of the control rod 12 for synchronous rotation. Therefore, the damping force variable mechanism 8 is
The regulator 10 is driven by the actuator 13 to select the amount of bypass of the hydraulic fluid.

Further, the variable damping force type hydraulic shock absorber 1
It is attached via an Atsupa mount insulator 20. The Atsupa mount insulator 20 includes a bracket 21 that is a cylinder with a bottom, a lower inner cylinder 22 that is a covered cylinder that is superimposed and coupled under the bottom wall of the bracket 21, and a vehicle body that is a cylinder that is open at both upper and lower ends. It is composed of an outer cylinder 23 for side attachment, and an insulator rubber 24 that connects the outer cylinder 23, the lower inner cylinder 22, and the bracket 21 together.

An annular flange 25 is provided on the periphery of the upper opening of the bracket 21 and extends horizontally outward in the radial direction. A plurality of female screw holes 26 are formed in the flange 25 . The female screw hole 26 corresponds in position to the screw insertion hole 13c formed in the lower flange 13b of the actuator 13.

A rod insertion hole 27 is formed in the overlapping portion of the bracket 21 and the lower inner cylinder 22.

The upper inner edge of the insulator rubber 24 extends around and above the flange 25 of the bracket 21. The extending portion 28 of the insulator rubber 24 covers the entire flange 25.

A flange 29 extending horizontally outward in the radial direction is provided on the outside of the periphery of the upper opening of the outer cylinder 23 . The flange 29 has bolts 30 under the vehicle body 14,
It is fixed with a nut 31.

Also, the reduced diameter part 7a at the top of the piston rod 7 is passed through the rod insertion hole 27 of the upper mount insulator 20, and the nut 32 is inserted into the male threaded part 7b of the reduced diameter part 7a that protrudes from the bottom wall of the bracket 21. By tightening, the piston rod 7 of the variable damping force type hydraulic shock absorber 1 is fastened to the overlapping portion of the bracket 21 and the lower inner cylinder 22 of the upper mount insulator 20.

The actuator 13 is attached to the bracket 21 so as to seal the upper opening of the bracket 21, with the output shaft 13a of the actuator 13 fitted to the control rod 12 so as to be able to rotate synchronously. In other words, the lower flange 13b of the actuator 13 is connected to the flange 2 of the bracket 21.
5 overlap the extending portion 28 of the insulator rubber 24 that has been turned upward, and insert the screw 33 into the flange 25 through the screw insertion hole 13c of the lower flange 13b.
The actuator 13 is attached to the bracket 21 by being fastened to the female screw hole 26 of the bracket 21. Actuator 1 is attached to this bracket 21.
3 is fixed with the screw 33, the upper end opening of the bracket 21 is sealed with the actuator 13, and the bracket 21 and the actuator 1 are
3, a sealed space 34 is formed.

According to this first embodiment, when the damping force variable hydraulic shock absorber 1 is attached to the vehicle body 14 via the Atsupa mount insulator 20, the damping force generating mechanism 6 and the damping force variable mechanism The operating sound generated by the piston rod 8 attempts to propagate into the vehicle interior through the sealed space 35, but in the process of propagating from the sealed space 34 into the vehicle interior, the actuator 13, the bracket 21, and the insulator rubber are 2
4 and the extended portion 28 of the insulator rubber 24 are subjected to a significant damping effect. Further, the extending portion 28 of the insulator rubber 24 is connected to the actuator 13.
is compressed while maintaining its elastic force by the fastening force of the screw 33 attached to the bracket 21, and the actuator 1 is in close contact with the lower flange 13b of the actuator 13 and the flange 25 of the bracket 21.
3 and the flange 25 of the bracket 21. Therefore, the sealing performance of the sealed space 34 becomes extremely high. Then,
The operating noise generated by the damping force generation mechanism 6 and the damping force variable mechanism 8 is blocked in the sealed space, and is prevented from air propagating into the vehicle interior.

Further, according to the first embodiment, when the actuator 13 is installed between the flanges 25 of the bracket 21, the extending portion 28 of the insulator rubber 14 is attached to the lower flange 13b of the actuator 13.
and the flange 25 of the bracket 21, so that the actuator 13 can be attached to the bracket 21.
There is no need to use a separate sound insulating member such as a rubber sheet when installing the product, improving work efficiency during assembly and preventing missing parts due to forgetting to insert the product.

Second Embodiment FIG. 2 shows a vehicle body side mounting device for a variable damping force type hydraulic shock absorber according to a second embodiment. This second
In the embodiment, the same parts as in the first embodiment are given the same reference numerals.

In FIG. 2, the outer edge located on the lower side of the insulator rubber 24 is connected to the flange 2 of the outer cylinder 23.
It is extended around 9. The extending portion 35 of the insulator rubber 24 covers the lower end surface of the outer tube 23, the outer surface of the outer tube 23, the lower surface of the flange 29, the outer peripheral end of the flange 29, and the head of the screw 33. The outer edge located on the upper side of the insulator rubber 24 and the extension portion 35 have protrusions 36, 3 that protrude from the upper surface of the flange 29 of the outer cylinder 23.
7 is provided. When attaching the Atsupa mount insulator 20 to the vehicle body 14, the protrusions 36 and 37 come into close contact with the lower surface of the vehicle body 14 to improve sealing between the vehicle body 14 and the Atsupa mount insulator 20. At the same time, it is possible to prevent tire road noise and the like from entering the vehicle interior.

In the first and second embodiments, in order to manufacture the upper mount insulator 20, the bracket 21, the lower inner cylinder 22, and the outer cylinder 23 are molded by a method such as press molding. The bracket 21 and the lower inner cylinder 22 are vertically connected together by welding or the like. In addition, the insulator rubber 24 is attached to the extension portion 2 by a method such as rubber molding.
8 or the extended portions 28 and 35 are unvulcanized. And insulator rubber 24
The above-mentioned integrated bracket 21 and lower inner cylinder 22
and insulator rubber 24.
The extended portion 28 of the insulator rubber 24 is placed over the flange 25 of the bracket 21, and the outer cylinder 2 is placed on the outside of the insulator rubber 24.
3, and the extending portion 35 of the insulator rubber 24 is placed over the flange 29 of the outer cylinder 23. The thus-combined product is placed in a mold, and the insulator rubber 24 is vulcanized and molded. Through this vulcanization molding, the insulator rubber 24 is given appropriate elasticity, and the insulator rubber 24 is
4 is integrally baked on the bracket 21, lower inner cylinder 22, and outer cylinder 23. The bracket 21, lower inner cylinder 22 and outer cylinder 23 of this insulator rubber 24
At the time of baking, an adhesive may be placed between the respective contact surfaces, and the bracket 21, lower inner cylinder 22, outer cylinder 23, and insulator rubber 24 may be integrally bonded with this adhesive.

Effects of the invention As described above, according to the invention, a sealed space is formed by an actuator for variable damping force and a bracket for attaching this actuator to a variable damping force type hydraulic shock absorber. The insulator rubber extends above the bracket's flange and is screwed onto the bracket's flange. In particular, the operating noise of the hydraulic fluid that passes through the damping force generation mechanism and variable damping force mechanism propagates to the piston rod of the variable damping force type hydraulic shock absorber, and then, in the process of propagating from the sealed space into the passenger compartment, the sound of the hydraulic fluid passes through the actuator and bracket. The insulator rubber and the extended portion of the insulator rubber are significantly damped. Moreover,
Since the extending portion of the insulator rubber is interposed between the actuator and the flange of the bracket, the sealing performance of the sealed space is extremely high. Therefore, the operating sound is reliably blocked in the sealed space and is not emitted into the vehicle interior. Therefore, the quietness in the vehicle interior can be improved.

Furthermore, according to the present invention, since the inner edge of the insulator rubber is extended around the flange of the bracket, the extended portion of the insulator rubber can be used when the actuator is attached to the bracket. It is interposed between the actuator and the flange of the bracket. Therefore, when attaching the actuator to the bracket, there is no need to interpose a separate sound insulating member, which improves work efficiency during assembly and prevents missing parts due to forgetting to insert the actuator.

Further, according to the present invention, since the sealed space is formed by the actuator and the bracket,
A lid is not required to form the sealed space, and the structure is simple and costs can be reduced.

Furthermore, according to the present invention, in the sealed space,
The bracket, the connection part between the bracket and the piston rod of the variable damping force hydraulic shock absorber, and the connection part between the output shaft of the actuator and the control rod of the variable damping force mechanism can be stored, reducing the overall size. It is possible to increase the bulk.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing the first embodiment, and FIG. 2 is a sectional view showing essential parts of the second embodiment. DESCRIPTION OF SYMBOLS 1... Variable damping force hydraulic shock absorber, 6... Damping force generation mechanism, 7... Piston rod, 8... Variable damping force mechanism, 12... Control rod, 13...
Actuator, 13a... Output shaft, 21... Bracket, 22... Lower inner cylinder, 23... Outer cylinder, 2
4...Insulator, 25...Flange, 28
... Extension part, 33 ... Screw, 34 ... Sealed space.

Claims (1)

[Claims for Utility Model Registration] A bracket in which a flange is formed on the outer side of the upper opening periphery of a bottomed cylinder, a lower inner cylinder formed in a covered cylinder superimposed under this bracket, and a cylinder with both ends open. An outer cylinder formed on the body for mounting on the vehicle body side is integrally coupled with an insulator rubber, and an inner edge of the insulator rubber is extended around the upper part of the flange of the bracket, while the bracket is a through hole is formed at the overlapping portion between the bracket and the lower inner cylinder, a piston rod of a variable damping force type hydraulic shock absorber is passed through the through hole, and the piston rod is fastened to the overlapping portion between the bracket and the lower inner cylinder; The output shaft of an actuator for variable damping force is fitted into the control rod for variable damping force in this piston rod so as to be able to rotate synchronously, and this actuator is attached to the insulator rubber which is wrapped around above the flange of the bracket. A variable damping force liquid, which is superimposed on the extending portion and fixed to the flange of the bracket with a screw, an upper opening of the bracket is sealed with the actuator, and a sealed space is formed between the bracket and the actuator. Structure of actuator mounting part of pressure buffer.