JP2596480Y2 - Hydraulic shock absorber actuator mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator mounting structure for adjusting a damping force of a hydraulic shock absorber.

[0002]

2. Description of the Related Art As a hydraulic shock absorber used for an automobile suspension or the like, a hydraulic shock absorber capable of adjusting a damping force according to a running state of a vehicle or the like has been developed. In many of these types of hydraulic shock absorbers, a variable damping force mechanism for adjusting a damping force is provided on a piston or a piston rod, and the variable damping force mechanism is externally controlled by an actuator at an upper end of the piston rod. It has become.

A conventional hydraulic shock absorber of this type has an actuator mounting structure as shown in FIG. 3, in which a control rod 1 of a damping force variable mechanism and an output shaft 2 of an actuator, a piston rod 3 and an actuator body 4 are connected. Each is positioned relative to each other in the direction around the axis, and the reference positions of the actuator and the damping force variable mechanism are initially adjusted.

[0004] In this actuator mounting structure, a so-called D-cut portion 5 is provided in the upper end side surface of the piston rod 3 which is cut out in a plane, and a bracket 6 for mounting the actuator body 4 to the piston rod 3 is provided on a bracket 6. A substantially D-shaped through hole 7 into which the D cut portion 5 can be fitted is formed. The bracket 6 is fixedly fastened to the piston rod 3 by a nut 9 together with the mount 8 for mounting the vehicle body in a state where the through hole 7 is fitted to the D-cut portion 5.
After that, the output shaft 2 is connected to the end of the control rod 1 by fitting with a two-sided width or the like, and the actuator body 4 is screwed to the bracket 6 (the screw is indicated by 10 in the figure). .

[0005] This similar structure is disclosed, for example, in Japanese Utility Model 1-38.
No. 360, for example.

[0006]

In the case of the above-described conventional actuator mounting structure, the piston rod 3 (via the bracket 6) is fitted by the D-cut portion 5 and the through hole 7 being fitted.
And the positioning of the actuator body 4 in the direction around the axis is performed. However, if the fitting of the D-cut portion 5 and the through hole 7 is too tight, the work of assembling the bracket 6 to the piston rod 3 cannot be performed smoothly. It is necessary to set the fitting between the portion 5 and the through hole 7 to some extent loosely.
Therefore, the positioning accuracy of the piston rod 3 and the actuator main body 4 in the direction around the axis cannot be sufficiently increased, and it is difficult to increase the initial adjustment accuracy of the actuator and the damping force variable mechanism.

Therefore, the present invention further improves the initial adjustment accuracy of the actuator and the damping force variable mechanism by accurately positioning the piston rod and the actuator body in the direction around the axis without adversely affecting the assembling work. An object of the present invention is to provide a hydraulic shock absorber actuator mounting structure that can be achieved.

[0008]

According to the present invention, as a means for solving the above-mentioned problem, a control rod of a damping force variable mechanism supported in a piston rod is positioned and fitted to an output shaft of an actuator to rotate. In addition to the dynamic connection, in the actuator mounting structure of the hydraulic shock absorber for tightening and fixing the piston rod and the actuator body in a state where they are positioned in the direction around the axis, the lower surface of the actuator body from which the output shaft projects is axially projected, A guide plane along the axial direction is formed inside the protruding portion, and an inclined plane is formed at one end of the guide plane,
At the tip of the piston rod, an engagement plane is formed along the axial direction which engages with a guide plane of the actuator body with a small allowance, and an inclined plane of the actuator body is formed at one end of the engagement plane. To form an engagement inclined plane for engaging the actuator body and the piston rod integrally in the rotation direction, and further,
Depending on the fastening force between the two
Axial force generation for pressing the inclined plane and the engaging inclined plane by force
A mechanism was provided.

[0009]

The output shaft of the actuator and the control rod can be positioned in advance around the axis with respect to the actuator body and the piston rod, respectively. In this case, the guide plane of the actuator body is
When the actuator body is axially approached toward the piston rod by engaging with the engagement plane of the piston rod,
The engagement plane is guided by the guide plane with a small play allowance
Around the output shaft of the actuator and the axis of the control rod
The approximate positions of the directions will be matched. In this state
Fine adjustment of the actuator around the axis
The output shaft and control rod are positioned
Is pivotally connected. Then, from this state, the piston lock
Axial force is generated when the actuator is
The mechanism makes the inclined plane and the engagement inclined plane tighten and secure.
It comes into pressure contact with the appropriate force, resulting in actuating
The eta body and piston rod are positioned accurately around the axis.
It is fixed and connected.

[0010]

Next, an embodiment of the present invention will be described with reference to FIG. Incidentally, it is assumed that using the same reference numerals in the conventional ones, the same parts shown in FIG.

In FIG. 1, reference numeral 3 denotes a piston rod of a hydraulic shock absorber provided with a damping force variable mechanism. A control rod 1 of the damping force variable mechanism is provided on a shaft core of the piston rod 3 via a bearing 11. It is supported rotatably. Although not shown, the damping force variable mechanism changes the area of the passage through which the hydraulic fluid passes according to the rotational position of the control rod 1, thereby adjusting the damping force generated inside the hydraulic shock absorber. It has become. The upper part of the piston rod 3 is formed in a stepped shape with a small diameter, and the stepped portion serves as a seat 12 for the mount 8 for mounting the vehicle body.
A thread is cut in the small diameter portion 13 above the seat 12, and the nut 9 is screwed into the thread. The upper end of the small diameter portion 13 extends along the axial direction.
A two- sided width 14 having two engagement planes is formed, and one of the notch bottom walls of the two-sided width 14 is inclined at a predetermined angle radially outward with respect to the radial direction of the piston rod 3. An engaging inclined plane 15 is provided. The control rod 1 protrudes upward from the upper end surface of the piston rod 3 by a predetermined amount, and a two-sided width 16 is formed at the protruded upper end portion.

On the other hand, 4 is an actuator body,
Reference numeral 2 denotes an output shaft disposed on the shaft core of the actuator body 4. A boss 17 surrounding the outer peripheral area of the output shaft 2 is provided on the lower surface of the actuator body 4, and the inner surface of the boss 17 has a two-sided width 14 of the piston rod 3.
Two guide planes along the axial direction that can engage with (engagement plane)
Engagement holes 18 with 18a, 18a and one guide plane
An inclined plane 19 that can contact the engagement inclined plane 15 is formed continuously at one end of 18a . A fitting groove 20 having a two-sided width shape is formed at the lower end of the output shaft 2, and the two-sided width 16 of the control rod 1 can be fitted into the fitting groove 20.

Reference numeral 6 denotes a bracket for connecting and supporting the actuator body 4 to the piston rod 3. The bracket 6 has a small diameter portion 13 of the piston rod 3.
Is formed, and a flange 22 for coupling to the outer peripheral area of the actuator body 4 is formed. 10 is the actuator body 4
And a screw for connecting the flange 22 and
This is a rubber bush that is interposed between the actuator body 4 and the flange 22 and into which the screw 10 is fitted. here,
Outer peripheral area of actuator body 4 facing flange 22
Of the lower surface 4a of the boss 17 and the inclined plane 19 in the boss 17 are inclined.
When the plane 19 is in contact with the engagement inclined plane 15,
The lower surface 4a of the actuator body 4 and the upper surface of the flange 22
A predetermined gap d is set between them.
The tutor body 4 and the flange 22 are tightened with the screw 10.
When fixed, the inclined plane 19 and the engagement inclined plane 15 are
In response to the compression deformation of the rubber bush 23,
They are pressed against each other by force. Therefore,
In the embodiment, the lower surface 4a of the actuator body 4
And the gap between the flange 22 and the rubber bush 23
Therefore, the axial force generating mechanism 30 according to the present invention is configured.
You.

In such a component configuration, the mount 8 and the bracket 6 are fitted into the small-diameter portion 13 of the piston rod 3, and in this state, the nut 9 is screwed into the small-diameter portion 13 so that the bracket 6 is mounted together with the mount 8. It is fastened and fixed to the seat of the piston rod 3. The actuator body 4 is placed on the flange 22 of the bracket 6, and the two flat widths 14 (engagement planes) of the distal end of the piston rod 3 are fitted into the guide planes 18 a, 18 a of the boss 17 at the center of the lower surface. At the same time, the two-sided width 16 of the control rod 1 is fitted in the fitting groove 20 of the output shaft 2. This output shaft 2
When fitting the trolley rod 1, control the output shaft 2
The roll rod 1 and the actuator body 4 are
Position the shaft around the ton rod 3 in the axial direction.
be able to. Therefore, the guide planes 18a, 18a
The actuator is engaged with the two-face width 16 (engagement plane).
When the body 4 is moved closer to the piston rod 3,
Force axis 2 and control rod 1 are positioned around the axis
It is easily fitted in the state. Actuator body 4
Is fastened to the flange 22 of the bracket 6 by the screw 10 in this state, and is thereby fixed to the piston rod 3. When the actuator body 4 is tightened to the flange 22 by the screw 10, the rubber bush 23 is gradually compressed, and accordingly, the engagement inclined plane 15 of the piston rod 3 is provided on the boss 17 of the actuator body 4. It will be against the plane 19.

The piston rod 3 and the actuator body 4
As described above, since the engagement inclined plane 15 and the inclined plane 19 are tightened and fixed in a state where they are abutted with each other, they are restrained in the direction around the axis and positioned accurately. Further, a two-sided width 14 (engagement plane) is formed in the small-diameter portion 13 of the piston rod 3, and the two-sided width 14 is
The guide surfaces 18a, 18a are fitted to each other, but the width across flats 14 and the guide planes 18a, 18a are within a range in which the approximate positions of the output shaft 2 and the control rod 1 in the direction around the axis can be aligned and guided. in loosely fitting (very small
With play allowance). For this reason, this mounting
In the structure, the actuator main body 4 can be easily assembled to the piston rod 3. When such an actuator mounting structure is adopted, the assembling work of each member can be easily performed, and the initial adjustment accuracy of the actuator and the damping force variable mechanism can be improved.

The embodiment of the present invention is not limited to the one described above. For example, as shown in FIG.
The engagement inclined planes 15a and 15b are formed on both shoulders of the
The engagement inclined planes 15a and 15b may be made to abut against inclined planes 19a and 19b similarly formed on the boss 17 side.

[0017]

[Effects of the Invention] As described above, according to the present invention, the actuator
Guide plane formed on eta body and formed on piston rod
The output shaft and the control are controlled by the guide action
Align the roll rod approximately in the direction around the axis, and
In the range of play allowance between the guide plane and the engagement plane
Output shaft and control by fine-tuning the tutor
That the rotary rod can be securely rotated and connected.
And then tighten the actuator body and piston rod.
When attaching and fixing, the axial plane
Pressing the engagement inclined plane with a force corresponding to the fastening force
And move the actuator body and piston rod around the axis.
It becomes possible to accurately position and fix it. Therefore, the piston rod and the actuator body can be accurately positioned in the direction around the axis without any trouble in the assembling operation. As a result, it is possible to further enhance the initial adjustment accuracy of the actuator and the damping force variable mechanism.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Control rod, 2 ... Output shaft, 3 ... Piston rod, 4 ... Actuator main body, 14 ... Width across flats (engagement plane), 15 ... Engagement inclined plane, 18a ... Guide plane, 19 ...
Inclined plane , 30 ... Axial force generating mechanism .

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-33997 (JP, A) JP-A-63-36739 (JP, A) JP-A 2-94949 (JP, U) JP-A 64-64 46568 (JP, U) JP-A 63-37838 (JP, U) JP-A 47-26117 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16F 9/00-9 / 58 B60G 17/08 F16K 31/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A control rod of a damping force variable mechanism supported in a piston rod and an output shaft of an actuator are positioned and fitted to be rotationally connected to each other, and the piston rod and the actuator body are positioned relative to each other in a direction around the axis. in the actuator mounting structure of the hydraulic shock absorber for clamping state, to project the lower surface of the actuator body, wherein the output shaft protrudes axially, the projecting portions
Inside, a guide plane along the axial direction is formed, and an inclined plane is formed at one end side of the guide plane, and at the tip of the piston rod, a guide plane of the actuator body is formed.
An engagement plane is formed along the axial direction to engage with a small play allowance, and one end of the engagement plane is engaged with the inclined plane of the actuator body to rotate the actuator body and the piston rod in the rotational direction. The engagement inclined plane to be engaged integrally
Forming and further the piston rod and actuator body
Between the flat and inclined planes with a force corresponding to the fastening force between them.
An actuator mounting structure for a hydraulic shock absorber, comprising an axial force generating mechanism for pressing a surface and an engagement inclined plane into pressure contact with each other .