JPH0552392U - Actuator support structure for hydraulic shock absorber - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a support structure in which vibration generated when the actuator body is driven is not transmitted to the piston rod. With the engagement portion 12 of the output shaft 11 in the boss 10 of the actuator body 9 engaged with the engagement portion 8 at the tip of the control rod 4 in the piston rod 1, the boss 10 is retained.
Then, the small-diameter portion 7 of the control rod 4 is fitted through the elastic member 10A. A bracket 15 for supporting the actuator body 9 to the piston rod 1, a tubular portion 17 having a flange portion 16 fixed to the flange portion 13 of the actuator body 9 with a bolt 14, and a hat fixed to the piston rod 1 with a nut 18. A mold-shaped portion 19 and an elastic member 20 that connects the tubular portion 17 and the hat-shaped portion 19 to each other.
It consists of and.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an actuator support structure for adjusting the damping force of a hydraulic shock absorber.

[0002]

[Prior Art]

 BACKGROUND ART A hydraulic shock absorber used for a vehicle suspension or the like has been developed that can adjust the damping force according to the running condition of the vehicle. In many of these hydraulic shock absorbers, a damping force varying mechanism for adjusting the damping force is provided on the piston or the piston rod, and the damping force varying mechanism is externally controlled by an actuator at the upper end of the piston rod. In order to support this actuator, for example, as disclosed in Japanese Utility Model Laid-Open No. 60-69711, there is a method in which the actuator body is fastened to a piston rod via a bracket with a nut.

[0003]

[Problems to be solved by the device]

 However, in the above conventional actuator support structure for a hydraulic shock absorber, the vibration generated when the actuator is driven is transmitted to the piston rod via the bracket, and finally reaches the vehicle body from the piston rod, and the vibration in the vehicle interior is lost. It causes the sound to be generated.

In view of this, the present invention provides an actuator support structure for a hydraulic shock absorber that does not cause abnormal noise in the passenger compartment and can improve quietness.

[0005]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention supports the actuator body on the piston rod via an elastic body while the control rod of the damping force variable mechanism supported in the piston rod and the output shaft of the actuator body are connected. did.

[0006]

[Action]

 Vibration generated when the actuator body is driven is absorbed by the elastic body and is not transmitted to the piston rod.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, reference numeral 1 denotes a piston rod of a hydraulic shock absorber having a damping force varying mechanism, which is fixed to an upper insulator bracket 2 with a nut 3 and supported by a vehicle body (not shown). The piston rod 1 is formed in a hollow shape, and a control rod 4 of a damping force varying mechanism is rotatably supported inside via a bearing 5. Although the damping force varying mechanism is not shown here, the damping force generated inside the hydraulic shock absorber is adjusted by changing the area of the passage through which the hydraulic fluid passes in accordance with the rotational position of the control rod 4. To do.

An O-ring 6 is provided below the bearing 5.

A tapered thin portion 7 is formed at the upper end of the piston rod 1, and a locking portion 8 at the tip of the control rod 4 projects from the thin portion 7.

On the other hand, the actuator body 9 is provided with a boss 10 which is fitted into the small diameter portion 7 of the piston rod 1 from the outside via an elastic member 10A. The boss 10 is provided with an output shaft 11, and the engaging portion 12 at the lower end of the output shaft 11 is adapted to engage with the engaging portion 8 of the control rod 4.

A flange portion 13 is provided around the actuator body 9, and a lower portion of a bracket 15 having an upper portion attached to the flange portion 13 by a bolt 14 is fixed to the piston rod 1.

The bracket 15 has a cylindrical portion 17 having a flange portion 16 attached to the flange portion 13 of the actuator body 9, a nut 3 for attaching the upper insulator bracket 2 of the piston rod 1, and another nut 18. It is composed of a hat-shaped portion 19 that is tightened by means of an elastic member 20 as an elastic body that connects the tubular portion 17 and the hat-shaped portion 19 by vulcanization adhesion.

Specifically, the lower peripheral edge of the tubular portion 17 is along the outer peripheral edge of the hat-shaped portion 19, and the lower edge of the tubular portion 17 is close to the peripheral edge of the hat-shaped portion 19 and does not come into contact therewith. In this state, the elastic member 20 is interposed between the lower peripheral edge of the tubular portion 17 and the hat-shaped portion 19.

According to the support structure of the above embodiment, the vibration generated by the driving of the actuator body 9 is transmitted from the boss 10 of the actuator body 9 and the flange portion 13 to the tubular portion 17 of the bracket 15. It

However, since the vibration transmitted to the boss 10 is absorbed by the elastic member 10A interposed between the boss 10 and the small diameter portion 7 of the piston rod 1, the vibration of the piston rod 1 from the boss 10 is reduced. It is not transmitted to the part 7. Further, the vibration transmitted to the tubular portion 17 of the bracket 15 is absorbed by the elastic member 20 interposed between the tubular portion 17 and the hat-shaped portion 19, so that the hat-shaped portion 19 has no vibration. Not transmitted.

Therefore, the vibration of the actuator main body 9 does not reach the vehicle interior through the piston rod 1 and does not generate any abnormal noise in the vehicle interior.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, the basic structure is similar to that of the first embodiment in that an elastic member 10A is interposed between the boss 10 of the actuator body 9 and the small diameter portion 7 of the piston rod 1. However, an elastic member 21 having a sealing function is interposed between the hat-shaped portion 19 and the tubular portion 17 of the bracket 15 in the first embodiment.

More specifically, first, the outer peripheral edge 2 A of the upper insulator bracket 2 is formed so as to rise along the outer peripheral surface of the tubular portion 17 of the bracket 15. Then, the elastic member 21 extends from the portion interposed between the outer peripheral surface of the hat-shaped portion 19 of the bracket 15 and the inner peripheral surface of the tubular portion 17 along the inner peripheral surface of the tubular portion 17. A first lip portion 21A that is in close contact with the lower surface of the actuator body 9 is provided at the tip portion that extends upward, and a portion that rises along the outer peripheral surface of the lower portion of the tubular portion 17 is provided with an outer peripheral edge of the appinator bracket 2. A second lip portion 21B which is in close contact with the inner peripheral surface of 2A is provided.

Therefore, the elastic member 21 has the function of preventing the vibration of the actuator body 9 from being transmitted as an abnormal noise into the vehicle compartment, as in the first embodiment described above. 21A also has a function of performing a seal between the actuator body 9 and the tubular portion 17 of the bracket 15 and a seal between the upper insulator bracket 2 and the tubular portion 17. As a result, it is possible to reduce the number of parts and the number of assembly steps as compared with the case where a separate sealing material is provided.

In the second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

[0023]

[Effect of the device]

 As described above, according to the present invention, since the actuator body is supported by the piston rod via the elastic body, the vibration generated when the actuator body is driven is absorbed by the elastic body, and the piston rod causes the interior of the vehicle interior to pass. Since it can be prevented from being transmitted to the vehicle, there is an effect that the quietness in the vehicle interior can be maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of the second embodiment.

[Explanation of symbols]

1 ... Piston rod, 4 ... Control rod, 9 ... Actuator main body, 11 ... Output shaft, 20 ... Elastic member (elastic body).

Claims (1)

[Scope of utility model registration request] 1. A liquid characterized in that an actuator body is supported by a piston rod through an elastic body in a state where a control rod of a damping force variable mechanism supported in the piston rod and an output shaft of the actuator body are connected. Pressure buffer actuator support structure.