JPH11294514A - Mounting method of damping force variable type buffer and actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting method of damping force variable type buffer and an actuator in which an improved positioning accuracy of a rotating direction of a piston rod and the actuator, and easy adjustment can be obtained. SOLUTION: In mounting structure of the damping force variable type buffer 10 in which damping force is variable in accordance with a rotation of a control rod 18 rotatably provided inside a piston rod 16 and the actuator 20 for rotating and driving the control rod 18, a tip of the piston rod 16 is formed so as to be a non-circular section, and a fit hole 20R to which the non-circular section tip of the piston rod 16 is engaged while being carried out a rotating regulation is formed to the actuator 20. A nut with outer flange 30 for fixing in a state that the tip of the piston rod 16 is projected toward a body, and a nut with inner flange 40 which is engaged to the nut with outer flange 30 to be regulated in an axial direction and can carry out positioning in a free direction in an axial direction to the actuator 20 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping force variable type shock absorber which varies a damping force in accordance with the rotation of a control rod rotatably provided in a piston rod, and an actuator for rotating the control rod. Related to the mounting structure.

[0002]

2. Description of the Related Art Conventionally, a structure for mounting such a variable damping force type shock absorber and an actuator has been disclosed in Japanese Unexamined Patent Publication No.
Japanese Unexamined Patent Publication (Kokai) No. H10-264, pp. 157-334 is known.

In this conventional example, a step is formed at an end of a piston rod of a variable damping type shock absorber, and a notch is formed at a tip end side of the step to engage with the notch. The actuator mounting bracket having the hole is mounted while interposing an insulator fixed to a vehicle body between the bracket and the stepped portion. The bracket, the insulator, and the piston rod are integrally fastened by a nut screwed to the tip of the piston rod, thereby fixing the piston rod to the vehicle body. Further, the actuator is attached and fixed to the fixed bracket with bolts.

[0004]

However, in such a conventional damping force variable type shock absorber and actuator mounting structure, the positioning of the piston rod and the actuator in the rotational direction is formed by a notch formed on the piston rod and a bracket. Of the notch and the engagement hole, and variations in the dimensional accuracy in the manufacture of the notch and the engagement hole, and the bolt fastening There has been a problem that positioning accuracy of the piston rod and the actuator in the rotational direction is reduced due to a time lag or the like.

[0005] If the positioning is not sufficient, a desired damping force cannot be obtained in a predetermined state, so that adjustment for positioning the piston rod and the actuator in the rotational direction is required, and the work cost is also increased. Therefore, there is a demand for a mounting structure that can easily achieve positioning accuracy and that can be easily adjusted.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a damping force-variable shock absorber and an actuator mounting structure that meet the above demand, have excellent positioning accuracy in the rotational direction of the piston rod and the actuator, and are easily adjusted. .

[0007]

In order to achieve the above object, the invention according to claim 1 makes the damping force variable according to the rotation of a control rod rotatably provided in a piston rod. A mounting structure for a variable damping type shock absorber and an actuator that rotationally drives the control rod, wherein the distal end of the piston rod has a non-circular cross-section, and the actuator has a non-circular cross-sectional distal end of the piston rod. A first fixing means for forming a fitting hole to be engaged with the rotation by being restricted, and fixing the piston rod to the vehicle body in a state in which a distal end portion of the piston rod is projected; A variable damping force type shock absorber and an actuator mounting structure, wherein a second fixing means which can be positioned in the axial direction with respect to the actuator is provided. A.

According to the above construction, the tip end of the piston rod having a non-circular cross section is directly restricted by the rotation of the fitting hole formed in the actuator and is engaged with the fitting hole. can do.

According to a second aspect of the present invention, in the first aspect of the present invention, the first fixing means includes a member provided integrally or separately with the piston rod and having a radially projecting portion. The variable damping force type shock absorber and the actuator, wherein the second fixing means includes a member rotatable with the radial projecting portion and axially regulated and engaged with and screwed to the actuator. Mounting structure.

According to this configuration, the actuator can be mounted and removed only by rotating the member of the second fixing means, and fine adjustment of the axial position can be easily performed.

Further, the invention according to claim 3 is based on claim 2
Wherein the member having a radial projection of the first fixing means is a nut with an outer flange screwed to the piston rod, and the variable damping force type shock absorber and the actuator are mounted. Structure.

According to this configuration, the piston rod can be attached to and detached from the vehicle body only by rotating the member having the radial projection of the first fixing means, and the position of the piston rod in the axial direction is delicate. Adjustment can be easily performed.

According to a fourth aspect of the present invention, in the second or third aspect, the member of the second fixing means is rotatably engaged with the radially projecting portion while being restricted in the axial direction. A variable damping force type shock absorber and an actuator mounting structure, wherein the nut is an inner flanged nut having an inner flange.

According to this structure, the regulation in the axial direction is easily performed by the engagement with the nut with the outer flange, and the manufacture thereof is also easy.

The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, a non-circular cross section of the distal end of the piston rod is formed asymmetrically in the left-right direction. It is a mounting structure of a variable damping force type shock absorber and an actuator.

According to this configuration, it is possible to prevent the piston rod and the actuator from being erroneously assembled in a state where the phases are shifted by 180 degrees.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition,
Throughout the description and drawings, the same reference numerals are used for the same functional parts.

FIG. 1 shows an outline of the overall configuration of an embodiment of the present invention, and FIG. 2 and FIG.

First, in FIG. 1, reference numeral 10 denotes a variable damping force type shock absorber, 12 denotes a cylinder, 14 denotes a piston that defines the inside of the cylinder 12 into an upper chamber and a lower chamber, and 16 denotes a piston connected to the piston 14. It is a piston rod. In addition,
The variable damping force type shock absorber 10 further includes two through holes that communicate the upper chamber and the lower chamber with the piston 14 and a bypass flow path that bypasses the through hole. The piston 14 has two through holes. It is well known that there are provided an expansion-side damping valve and a compression-side damping valve that open and close, and a rotatable adjuster that changes the cross-sectional area of the bypass flow path. Then, a control rod 18 rotatably provided in the piston rod 16 is connected to the adjuster,
The rotation is controlled by a step motor 20 as an actuator described later.

The damping force-variable shock absorber 10 has a lower end attached to a suspension member (not shown) via an attachment eye 22, and an upper end attached to the body member 24 as will be described later in detail. Is mounted through a mounting hole. 26 is a suspension spring interposed between the bracket fixed to the cylinder 12 and the vehicle body member 24 via an insulator, and 28 is a bumper rubber. An insulator 50 is disposed above the vehicle body member 24, and the piston rod 16 is fixed to the vehicle body member 24 via the insulator 50.

Next, the details of the mounting structure will be described with reference to FIGS.

In FIG. 2, a step motor 20 as an actuator according to the present embodiment
It has a cylindrical main body 20B projecting downward from 0H and an output shaft 20P at the center thereof. A non-circular non-circular fitting hole 20 is provided at the center of the cylindrical main body 20B.
R is formed stepwise. That is, the output shaft 20P is formed stepwise so that it can protrude from the bottom of the fitting hole 20R. Further, a male screw is formed on the outer periphery of the cylindrical main body 20B. A slit is formed at the distal end of the output shaft 20P, and a flat portion at the distal end of the control rod 18 is engaged with the slit.

The distal end of the piston rod 16 is formed in a non-circular cross-section so that the piston rod 16 is restricted in rotation and engaged with a non-circular fitting hole 20R formed in a cylindrical main body 20B of the step motor 20. It has become. A male screw is formed on the outer periphery of the distal end portion of the piston rod 16 except for a portion formed in a non-circular cross section.

Reference numeral 30 denotes a piston rod 1
6 is a piston rod fixing nut that constitutes a part of a first fixing means for fixing the distal end of the piston rod 6 in a protruding state. In the present embodiment, the nut is screwed to a male screw of the piston rod 16 and radially. This is an outer flanged nut having an outer flange 30F as a protruding portion.

A second reference numeral 40 designates a second member which is restricted in the axial direction with respect to the piston rod 16 and can be positioned at a free position in the axial direction with respect to the step motor 20 as an actuator.
Is a nut for fixing the actuator, which constitutes a part of the fixing means.
B is an inner-flanged nut having an inner flange 40F which is screwed to a male screw on the outer periphery of B and is rotatably and axially regulated and engages with an outer flange 30F as a radial projection.

The above-described insulator 50 has a hole at the center thereof through which the piston rod 16 is inserted, and a collar 52 is vulcanized and bonded to the end face.

The mounting procedure of the embodiment having the above configuration will be described below.

First, the piston rod 16 on which the bumper rubber 28 is mounted is inserted into a mounting hole of the vehicle body member 24, and its tip protrudes from the vehicle body member 24. Then, the insulator 50 having the collar 52 adhered to the protruding portion is installed, and further, the outer flange nut 30 and the inner flange nut 40 in which the outer flange 30F and the inner flange 40F are overlapped are simultaneously installed.

Here, the nut 50 with the outer flange is screwed into the male screw of the piston rod 16 and tightened. As a result, the piston rod 16 is fixed to the vehicle body member 24 in a state where the distal end portion protrudes. In this state, the inner flanged nut 40 is freely movable in the axial direction, and is lowered downward and supported by the collar 52.

Next, the non-circular cross-section at the distal end of the piston rod 16 and the non-circular fitting hole 20R of the cylindrical main body 20B are fitted, and the step motor 20 is temporarily attached.

In this state, when the nut 40 with the inner flange and the external thread on the outer periphery of the cylindrical main body 20B are screwed and screwed, the outer flange 30F and the inner flange 40F are engaged, and the nut 40 with the inner flange is engaged. Are rotatable and restricted in the axial direction. Then, when the nut 40 with the inner flange is further tightened, the fitting of the step motor 20 is deepened in a state where the stepping motor 20 is positioned in the rotation direction on the piston rod 16 due to the fitting of the non-circular fitting hole 20R, and the slit is formed. The flat portion at the tip of the control rod 18 is engaged and fixed therein.

On the other hand, when removing the step motor 20, it is sufficient to carry out the reverse procedure. For example, when removing only the step motor 20, only the nut 40 with the inner flange is loosened.
When it is necessary to remove the variable damping force type shock absorber 10, the nut 30 with the outer flange may be further loosened.

Therefore, only by a simple rotation operation of the nut,
Attachment and removal can be performed while positioning accuracy in the rotation direction is secured. Further, the body member 24
The relative position of the piston rod 16 or the step motor 20 as an actuator in the axial direction can be set simply by the amount of rotation of the nut 30 with the outer flange or the nut 40 with the inner flange, and the delicate position of those axial positions. Adjustment can be easily performed.

As another embodiment, the first fixing means includes a member having a radial projection, which is provided integrally with or separately from the piston rod 16 instead of the nut 30 with the outer flange. It may be configured. However, when the member having the radial projection is provided integrally with the piston rod, the first fixing means requires another fixing means such as a nut. When a member having a radially projecting portion is provided separately from the piston rod, the member may be fixed by press-fitting the piston rod or the like.

[0035]

As described above, according to the first aspect of the present invention, the tip of the piston rod having a non-circular cross section is directly restricted by the fitting hole formed in the actuator, and the rotation is restricted. Therefore, the positional accuracy in the rotation direction can be improved.

According to the second aspect of the present invention, the second
The actuator can be mounted and removed only by rotating the member of the fixing means, and fine adjustment of its axial position can be easily performed.

Further, according to the third aspect of the present invention, the piston rod can be attached to and detached from the vehicle body only by rotating the member having the radial projection of the first fixing means. Fine adjustment of its axial position can easily be made.

According to the fourth aspect of the present invention, the axial direction is easily regulated by the engagement with the nut with the outer flange, and the manufacture thereof is also easy.

According to the fifth aspect of the invention, it is possible to prevent the piston rod and the actuator from being erroneously assembled in a state where the phase is shifted by 180 degrees.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating an outline of an overall configuration of an embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of the embodiment of the present invention.

FIG. 3 is a sectional view taken on line AA of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Variable damping-type shock absorber 16 Piston rod 18 Control rod 20 Step motor (actuator) 20R Fitting hole 30 Nut with outer flange 30F Outer flange (radial projection) 40 Nut with inner flange 40F Inner flange

Claims (5)

[Claims] 1. A mounting structure for a damping force variable type shock absorber for varying a damping force according to rotation of a control rod rotatably provided in a piston rod, and an actuator for rotating and driving the control rod. The distal end of the piston rod is formed in a non-circular cross-section, and the actuator is provided with a fitting hole in which the non-circular cross-sectional end of the piston rod is rotationally restricted and engaged. A first fixing means for fixing the distal end portion in a protruding state, and a second fixing means which is axially regulated with respect to the piston rod and can be axially positioned with respect to the actuator. A mounting structure for a variable damping force type shock absorber and an actuator. 2. The method according to claim 1, wherein the first fixing means includes a member provided integrally or separately with the piston rod and having a radial projection, and the second fixing means rotates with the radial projection. 2. A member which is capable of being axially regulated and engaged and screwed to said actuator.
The mounting structure of the variable damping force type shock absorber and the actuator according to the above. 3. The damping force variable type shock absorber according to claim 2, wherein the member having a radial projection of the first fixing means is an outer flanged nut screwed into the piston rod. Mounting structure of the vessel and the actuator. 4. The nut of claim 2, wherein the member of the second fixing means is an inner flanged nut having an inner flange rotatable on a radially projecting portion and axially regulated and engaged therewith. Or the mounting structure of the variable damping force type shock absorber and the actuator according to 3. 5. The mounting structure for a variable damping force type shock absorber according to claim 1, wherein a non-circular cross section of a distal end portion of the piston rod is formed asymmetrically in right and left directions. .