JP2562169Y2 - Damper damping force adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a damping force adjusting mechanism for a shock absorber used in a vehicle or the like.

(Prior art) As a damping force adjusting mechanism of a shock absorber used for a vehicle or the like,
For example, as described in JP-A-54-53437, an adjusting rod is inserted into a hollow rod so as to be able to move forward and backward, and an adjust pulley is screwed onto a cylindrical member fixed to a base end of the hollow rod. By fixing the base end of the adjustment rod to this adjustment pulley and operating the operation unit provided on the handle, the adjustment pulley rotates through the wire to advance and retreat the adjustment rod, and the damping force can be adjusted. Things are disclosed.

(Problem to be solved by the invention) However, in the above-described damping force adjusting mechanism,
Since the adjusting pulley is screwed onto the cylindrical member and the base end of the adjusting rod is fixed to the adjusting pulley, the structure becomes complicated and the mounting work becomes troublesome, and the thread must be machined. Processing man-hours increase.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a piston that slides in the cylinder at the tip of the piston rod, makes the piston rod hollow, and adjusts the damping force in the hollow rod. In the damping force adjusting mechanism of the shock absorber, the adjusting rod is inserted so as to be able to advance and retreat in the axial direction of the hollow rod, and the damping force of the shock absorber is adjusted by axially moving the adjusting rod in the hollow rod. The mounting member is fixed to the distal end of the hollow rod protruding from the opening, and a concave portion is formed on the end surface of the mounting member, which is opened in the axial direction outward in parallel with the axis of the adjusting rod and is eccentric with respect to the axis of the hollow rod. Then, a cylindrical cam member having a cam surface on the bottom surface for moving the adjustment rod forward and backward is rotatably inserted into the inner periphery of the concave portion, and the adjustment rod is brought into contact with the cam surface of the cam member. An adjusting member for adjusting the damping force is provided at the opposite end by rotating the cam member to advance and retract the adjusting rod.

According to the present invention, a spring for extending a wire for remote operation between an adjusting member for rotating the cam member and an operation lever for remote operation, and for urging in a direction opposite to the rotational operation direction of the cam member. Was interposed between the adjusting member and the mounting member.

 Further, in the present invention, the adjusting member is a fan-shaped member.

Further, in the present invention, a protective cover for covering the adjusting member exposed to the outside of the mounting member is fitted to the mounting member.

(Operation) By rotating the adjusting member of the cam member, the adjusting rod advances and retreats in the axial direction so that the damping force can be adjusted. The adjusting member urged in the rotating direction is attached to the cam member, and the wire is attached to the adjusting member. By operating the operation lever, the cam member can be rotated from the outside against the urging force by operating the operation lever,
The use of the cam member eliminates the need for screw processing, reduces the number of processing steps, and simplifies the configuration for remote control.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 is a sectional view of a shock absorber provided with a damping force adjusting mechanism to which the present invention is applied, FIG. 2 is an enlarged sectional view of a main part of the shock absorber, FIG. 3 is a top view of the shock absorber, and FIG. FIG. 2 is a top view of the shock absorber with a protective cover removed.

In FIG. 1, a hollow rod 2 is provided with a cap 3, an oil seal 4, a rod guide 5,
Oil seal 6, retainer 7, and rebound rubber 8
Has been inserted through. At the lower end of the hollow rod 2, a piston 9 that is in sliding contact with the inner peripheral surface of the cylinder 1 is mounted.

The above-mentioned piston 9 has an extension-side oil passage for generating a damping force.
10 and a compression-side oil passage (not shown) are formed. An extension valve 11 composed of a plurality of disc valves for opening and closing the extension oil passage 10 is provided on the lower surface of the piston 9, and a compression valve 12 for opening and closing the compression oil passage is provided on the upper surface of the piston 9. Have been. An oil passage 14 that bypasses the piston 9 through an internal bypass oil passage 13 is formed at the lower end of the hollow rod 2.

A partition member 16 having a through hole at the center is attached to the inner peripheral surface of the lower end of the cylinder 1, and the partition member 16 holds the prada 17 to absorb a volume change accompanying the advance and retreat of the hollow rod 2. In addition, a mounting eye 18 for mounting the cylinder 1 is integrally provided at the lower end of the cylinder 1 on the wheel side or the like.

At the upper end of the hollow rod 2, a forked attachment member 21 is provided.
And the upper end of the hollow rod 2 is attached to the vehicle body or the like via the attaching member 21. A retainer 22 is attached to the lower end surface of the mounting member 21, and a spring seat 23 is attached to a peripheral portion of the retainer 22. On the other hand, a jack cylinder 24 is fitted to an outer peripheral surface of a lower end portion of the cylinder 1. , A jack piston 24 is slidably fitted.
A suspension spring 26 is interposed between the above-mentioned spring seat 23 and the jack piston 25, and a stopper rubber 27 is attached below the retainer 22.

The adjustment rod 31 is inserted into the hollow rod 2 so as to be able to advance and retreat. The lower end of the adjusting rod 31 faces the mounting sheet 32 at the lower end of the hollow rod 2, and the adjusting rod 31 advances and retreats in the hollow rod 2, thereby changing the opening amount of the bypass oil passage 13 to reduce the damping force. I adjusted it.

The mounting member 21 for mounting on the vehicle body or the like has a concave shape as clearly shown in FIG. 2, and is provided at an intermediate portion between the right and left standing pieces for mounting on the vehicle body side as shown in FIG. The hole is provided so as to be orthogonal to the axis of the hollow shaft 2. Upper surface forming the bottom of the concave portion of the mounting member 21
On the bottom 21b, a columnar cam member 33 having a relatively large diameter and having a cam surface 33a which is in contact with the upper end 31a of the adjustment rod 31 is provided on the bottom surface.

The installation of the cam member 33 will be specifically described as shown in FIG.
Eccentric radially outward with respect to the axis of
The concave portion 21a sunk in a direction parallel to the axis of the adjusting rod 31 is formed as clearly shown in FIG. As shown in FIG. 2, the concave portion 21a is opened axially outward on the upper surface 21b of the mounting member 21, and a through hole 21c through which the upper end portion 2a of the hollow rod 2 penetrates is formed on the bottom surface of the corner. In addition, as shown in FIG. 2, the through hole 21c is formed as a screw hole, while a screw is formed on the outer periphery of the upper end 2a of the hollow rod 2, and both are screwed.

The cam surface 33a is provided on the bottom surface of the cam member 33 as described above, and the upper end 31a of the adjustment rod 31 inserted into the hollow rod 2 is moved to the upper end of the hollow rod 2 as described above. From above and abuts the cam surface 33a.

As shown in FIG. 2, the cam member 33 has an upper half with a small diameter, a stopper 33a is fitted on the outer periphery thereof, and a screw is formed on the outer periphery of the stopper 33a.
A screw is formed on the inner periphery of the upper half of the stopper 33a and the recess 21a.
The screw on the inner periphery of the upper half of the
Was rotatably mounted in the recess 21a of the mounting member 21. The axial movement of the cam member 33 is restricted by the stopper 33a.

On the upper surface of the cam member 33, the cam member 33 is remotely controlled.
Is fixed via screws 34a.

The adjusting member 34 has an arc shape centering on the screw 34a, and has a sector shape in plan view as clearly shown in FIG. A coil spring 35 is interposed between the adjusting member 34 and the mounting member 21. Connect one end of the spring 35 to the mounting member
21 and the other end is locked to the adjusting member 34 to act as a torsion spring.
35 urges the cam member 33 in the direction opposite to the rotational operation direction in the direction of the arrow in FIG.

As shown in FIG. 4, the mounting member 21 supports a remote control non-wire tube 37 by a support member 36, and adjusts the distal end of the wire 38 passing through the wire tube to an adjusting member.
The end is fixed by fitting it into a wire groove 39 (see FIG. 2) formed in 34. The base end of the wire 38 is connected to an operating lever (not shown) provided on a handle or the like, for example, and a protective cover 40 is fitted to the mounting member 21 as shown in FIG.

With the configuration described above, when adjusting the damping force, the wire 38 is pulled, for example, by rotating the operation lever (not shown), and the adjusting member 34 is pressed against the biasing force of the coil spring 35 to adjust the damping force. 4 Rotates in the direction opposite to the arrow direction. As a result, the cam member 33 integrated with the adjusting member 34 rotates, and the adjusting rod 31 is moved by the cam surface 33a on the bottom surface.
And the amount of opening of the bypass oil passage 13 is reduced to increase the generated damping force.

By rotating the operation lever in the reverse direction, the wire 38 is loosened, and the adjusting member is adjusted by the urging force of the coil spring 35.
34 rotates in the direction of the arrow in FIG. As a result, the adjustment member 34
The cam member 33 rotates integrally with the adjustment rod 3 and the cam surface 33a
1, the adjusting rod 31 is raised by the internal pressure, the opening amount of the bypass oil passage 13 is increased, and the generated damping force is reduced.

In addition, although the description has been made with the arrangement in which the mounting member 21 is placed on the upper side, it goes without saying that the same operation is performed even when the mounting member 21 is mounted upside down.

(Effects of the Invention) As described above, according to the present invention, the mounting member is fixed to the distal end of the hollow rod protruding from the cylinder, and the end surface of the mounting member is axially outwardly parallel to the axis of the adjustment rod. A concave portion that opens to the side and is eccentric to the axis of the hollow rod is formed, and a columnar cam member having a cam surface at a bottom portion where the adjustment rod advances and retracts is rotatably inserted into the inner periphery of the concave portion, An adjusting member is provided at the end of the cam member opposite to the cam surface so that the adjusting rod is brought into contact with the cam surface and the cam member is rotated to advance and retreat the adjusting rod to adjust the damping force. Therefore, by rotating the cam member, the adjustment rod moves forward and backward, and the damping force can be adjusted. Since the rotation of the cam member does not generate abrasion powder, stable adjustment can be ensured.
Also, since the concave portion for inserting the cam member is provided on the mounting member so as to open outward in the axial direction, the assembling of the cam member,
Adjustment is easy. Further, the use of the cam member eliminates the need for screw processing, reduces the number of processing steps, and simplifies the configuration for remote control.

According to the present invention, a spring for extending a wire for remote operation between an adjusting member for rotating the cam member and an operation lever for remote operation, and for urging in a direction opposite to the rotational operation direction of the cam member. Is interposed between the adjustment member and the mounting member, so that the cam member can be remotely operated from outside by operating the operation lever.

Further, in the present invention, since the adjusting member is a fan-shaped member, the adjusting member can be arranged in a narrow space, which is advantageous in installing the adjusting member.

Further, according to the present invention, since the protective cover for covering the adjusting member exposed to the outside of the mounting member is fitted to the mounting member, the adjusting member and the like can be protected from dust and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shock absorber provided with a damping force adjusting mechanism to which the present invention is applied, FIG. 2 is an enlarged sectional view of a main part of the shock absorber, and FIG.
FIG. 4 is a top view of the shock absorber, and FIG. 4 is a top view of the shock absorber with a protective cover removed. In the drawings, 1 is a cylinder, 2 is a hollow rod, 9 is a piston, 13 is a bypass oil passage, 21 is a mounting member, 21a is a concave portion, 31 is an adjusting rod, 33 is a cam member, 34 is an adjusting member, 35
Is a spring, 38 is a wire, and 40 is a protective cover.

Claims (4)

(57) [Scope of request for utility model registration] 1. A piston which slides in a cylinder is provided at a distal end of a piston rod, and the piston rod is hollow,
An adjusting rod for adjusting the damping force is inserted into the hollow rod so as to be able to advance and retreat in the axial direction of the hollow rod, and the damping force of the shock absorber is adjusted by axially reciprocating the adjusting rod in the hollow rod. In the damping force adjusting mechanism of the shock absorber, a mounting member is fixed to a distal end portion of the hollow rod protruding from the cylinder, and is opened at an end surface of the mounting member in an axially outward direction in parallel with the axis of the adjusting rod, And, a concave portion which is eccentric with respect to the axis of the hollow rod is formed, and a cylindrical cam member having a cam surface on the bottom surface for moving the adjusting rod forward and backward is rotatably inserted into the inner periphery of the concave portion. An adjusting member for adjusting the damping force is provided at the end of the cam member opposite to the cam surface, by rotating the cam member to advance and retreat the adjusting rod while bringing the adjusting rod into contact with the adjusting member. Characterized by Damper damping force adjustment mechanism. 2. A remote control wire is provided between an adjusting member for rotating the cam member and an operation lever for remote operation, and is urged in a direction opposite to the rotational operation direction of the cam member. The damping force adjusting mechanism for a shock absorber according to claim 1, wherein the spring is interposed between the adjusting member and the mounting member. 3. The damping force adjusting mechanism for a shock absorber according to claim 1, wherein said adjusting member is a fan-shaped member. 4. The mounting member according to claim 1, wherein a protective cover for covering said adjusting member exposed to the outside of said mounting member is fitted.
Any of the damping force adjusting mechanisms for the shock absorber.