JPH08210414A - Shock absorber - Google Patents

Abstract

PURPOSE: To perform the installation of a spring simply and quickly by only the operation of pushing a guide sleeve onto a cylinder by engaging the locking projection projected around a cylinder with the locking notch on the guide sleeve when inserting the guide tube around the cylinder while compressing the spring. CONSTITUTION: At the time of assembly of a shock absorber suspended between the body frame of a bicycle and the end of the rear arm supporting a rear wheel, or the like, first a spring 4 is set on a cylinder 1, and its one end is put in such condition that it can be born by a spring bearing member 6. Next, a guide sleeve 11 is inserted into a holder 7b and a tubular cam member 9 constituting a spring bearing member 5, whereby they are made unit. Next, the unit guide sleeve 11 is pushed around the cylinder 1, and the whole length of the guide sleeve 11 is passed under the projection 3, and then the guide sleeve 11 is rotated, and the locking notch 13 made on the guide sleeve 1 is engaged with the locking projection 3. Hereby, the spring 4 is assembled in compressed condition between the holders 7 and the spring bearing member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber used as a rear cushion unit for a rear wheel suspension system of a motorcycle.

[0002]

2. Description of the Related Art As a conventional rear cushion unit, for example, there is one disclosed in Japanese Patent Laid-Open No. 61-140634.

In this, a damper is installed between a body frame and a rear arm that is pivotally supported by the body frame and supports a rear wheel, and a spring bearing member is attached to each end of the damper to extend the damper. As described above, a spring is interposed between the spring receiving members.

Further, in this rear cushion unit, the spring receiving member is moved in the axial direction of the damper by rotating one of the spring receiving members so that the initial repulsive force of the spring is made variable. And one end of the damper are engaged with each other by a cam means, and a cylindrical cover is provided on the spring receiving member so as to cover the cam means.

Further, the cam means is composed of a projection provided on the outer peripheral surface of the damper and a cam surface formed on the cover side and engaging with one end of the projection in the axial direction of the damper. Along with the formation of multiple openings along the edge, the other end of the protrusion can be seen through this opening, and the display body that displays the initial repulsive force of the spring at this time corresponds to each opening on the outer surface of the cover. It is attached to the position.

Further, in this rear cushion unit, the spring is assembled after the damper body is assembled.
Insert the spring force adjusting member and the spring into the damper body, and press the winding part other than the upper end of the spring downward with a finger to make a gap with the cover.

Next, a spring guide having a slit having a width that allows the piston rod to pass through is fitted into the upper surface of the spring, and in this state, the pressing force of the spring is gradually relaxed so that it is between the cover and the cover. The spring is assembled so that the spring guide is fitted.

[0008]

However, in such a conventional rear cushion unit, when the spring is assembled, the winding portion (spiral part) of the spring is compressed by a jig to assemble the piston rod side spring receiving member. Therefore, there is a problem in that the operability is poor, the jig becomes slippery, and the work efficiency of assembling the spring is poor.

Further, at this time, there is a problem that the spring and the spring guide are damaged and the spring is deformed.

Incidentally, this phenomenon often occurs at the time of maintenance or setting of races other than the factory where the production equipment is well prepared.

The present invention has been made in view of the above-mentioned conventional problems, and provides a shock absorber capable of reliably and inexpensively mounting a spring without using a special jig. The purpose is to

Another object of the present invention is to provide a shock absorber capable of mounting the spring more quickly and easily.

[0013]

According to a first aspect of the present invention, there is provided a shock absorber, which is interposed between a first spring receiving member and a second spring receiving member provided on a cylinder and a piston rod, respectively. And a spring for urging the piston rod in the extension direction, and the first side of the cylinder side.
A ring plate-shaped holder that constitutes the spring receiving member, a tubular cover attached to the holder, a tubular cam member provided in the tubular cover and having a cam surface on one end surface, the holder, And a guide cylinder, which is inserted into the cylindrical cam member and is provided on the outer periphery so that a protruding member slidably abuts on the cam surface, and compresses the spring by the holder, By inserting into the outer periphery of the cylinder, the locking projection is fitted in the locking notch on the guide cylinder.

Further, in the shock absorber according to the invention of claim 2, the tubular guide has a length for guiding and supporting the inner circumference of the spring when the spring is maximally extended.

[0015]

In the shock absorbing device according to the present invention, the spring is inserted into the outer periphery of the cylinder from the cylinder side so that one end is supported by the second spring receiving member on the piston rod side, and subsequently,
A protruding member on the outer circumference of the guide cylinder is brought into contact with the cam surface of the cylindrical cam member, and the guide cylinder is inserted into the cylindrical cam member having the cam surface, so that one end of the spring is located on the cylindrical cover side. The guide cylinder can be inserted into the outer periphery of the cylinder while being supported by a ring plate-shaped holder.

As a result, the spring is compressed and gradually urges the piston rod and the cylinder toward each other in the extending direction, and the notch provided on the inner circumference of the guide cylinder is inserted into the cylinder at a predetermined insertion amount of the guide cylinder. By fitting in the locking projections on the outer circumference, these mutual axial movements are retained, and the assembly of the spring is completed.

As a result, the spring can be mounted between the cylinder and the piston rod simply, quickly and safely by simply pushing the guide cylinder into the cylinder in the axial direction. By supporting the spring with a flat holder, the spring can be held stably and the deformation of the spring during assembly can be reliably avoided.

Further, in the shock absorber according to the second aspect of the present invention, by making the guide cylinder sufficiently long, it becomes possible to mount the spring receiving member to the cylinder without applying an initial load to the spring, and the spring is assembled. Greatly improves the workability of.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings. FIGS. 1 and 2 are a front view and a side view showing the entire shock absorber of the present invention partially broken away, Two
Is a cylinder and a piston that expands and contracts to absorb shock, and these constitute a well-known damper.

A projecting member 3 is provided on the outer circumference near the end of the cylinder 1.

The cylinder 1 and the piston rod 2 are mounted, for example, between a vehicle body frame of a motorcycle and a rear arm end which is pivotally supported by the vehicle body frame and supports a rear wheel. Cylinder 1
A second spring bearing member 6 which supports one end of a spring 4 interposed between the first spring bearing member 5 on the side and the first spring bearing member 5 is attached.

Further, 7 is a ring plate-shaped holder as shown in FIGS. 3 and 4, and one end of a cylindrical cover 8 is attached to one side of the holder 7, and the cylindrical cover 8 is attached. A cylindrical cam member 9 is in contact with the inner peripheral base of the.

Here, a pair of locking projections 8a and two pairs of locking projections 9a are provided at one end of each of the cylindrical cover 8 and the cylindrical cam member 9, and the locking projections among them are provided. 9a are locked and held so as not to rotate in the large and small cutouts 7a and 7b formed in the inner peripheral portion of the holder 7, respectively, and the locking projections 8a do not rotate in the two cutouts 7a, respectively. Locked and held.

Further, on the end surface of the cylindrical cam member 9 opposite to the protruding side of the locking projection 9a, there is a wavy cam surface 9b whose distance from the surface of the holder 7 changes as shown in FIG. It is formed as shown in the development view.

On the other hand, the cylindrical cover 8 is provided with a plurality of portions facing the cam surface of the cylindrical cam member 9 so that the positions of the projection members described later can be seen from the outside and a jig or the like is inserted. It has a through hole 8b for rotating the cylindrical cover 8 as shown in FIG.

The holder 7, the tubular cover 8 and the tubular cam member 9 form a first spring receiving member 5.

Further, in FIG. 1 and FIG. 2, 11 is
A guide cylinder inserted into the outer periphery of the cylinder 1, and a pair of protrusion members 12 are integrally provided on the outer periphery of the guide cylinder 11, and an end surface of the guide member 12 on the holder 7 direction side has the cylindrical cam member. It is slidably supported on the cam surface 9b of the reference numeral 9.

As shown in FIGS. 7 and 8, the guide cylinder 11 has four recesses 11a at equidistant positions in the circumferential direction, and two recesses 11a have one end at one end. A locking notch 13 for opening is provided.

The locking notch 13 is engaged with the locking projection 3 provided on the outer periphery of the cylinder 1.

Next, a method of assembling the shock absorber having such a structure will be described. First, the spring 4 is inserted from the tip end side of the cylinder 1 into the cylinder 1 of the shock absorber constructed as shown in FIG. One end of the first spring is ready to be supported by the second spring receiving member 6.

Next, the guide cylinder 11 is inserted into the holder 7 and the tubular cam member 9 which form the second spring receiving member 5, and the guide cylinder 11 is inserted into the cam surface 9b of the tubular cam member 9. One end of the protruding member 12 is brought into contact with the guide cylinder 1
1 and the 2nd spring receiving member 5 are unitized.

Subsequently, the guide cylinder 11 thus unitized is inserted into the outer circumference of the cylinder 1 from the end side of the cylinder 1. This insertion is done in the recess 1 of the guide tube 11.
The inner surface of the la is slidably contacted with the outer circumference of the cylinder 1.

At this time, the holder 7 is connected to the second portion of the spring 4.
It contacts one end on the side opposite to the spring receiving member 6 and compresses it.

At this time, when the projection member 3 on the cylinder 1 is passed through the gap G between the recesses 11a of the guide cylinder 11 and the entire length of the guide cylinder 11 is passed through the projection member 3. Then, the guide cylinder 11 is rotated to fit the locking notch 13 formed in the guide cylinder 11 into the locking protrusion 3.

By doing so, the spring 4 has the first
The holder 7 that constitutes the spring receiving member 5 and the second spring receiving member 6 are assembled in a compressed state.

Next, the load adjusting operation of the spring 4 will be described. In this load adjusting, first, a jig is inserted into the through hole 8b formed in the cylindrical cover 8 to make the cylindrical cover 8 Rotate clockwise or counterclockwise.

For this reason, the cam surface 9b of the tubular cam member 9 which rotates integrally with the tubular cover 8 also rotates in the same direction, and with respect to the projection member 12 having one end in contact with the cam surface 9b,
The tubular cam member 9 having the cam surface 9b moves in the axial direction while receiving the elastic force of the spring 4. Thereby, the initial load adjustment of the spring 4 is performed.

At this time, since the guide projection 11 on the cylinder 1 is fitted into the lock notch 13 of the guide cylinder 11, the guide cover 11 of the first spring bearing member 5 is covered. Despite the turning operation, it never turns.

Further, the length of the guide cylinder 11 on the side supporting the inner circumference of the spring 4 is made sufficiently long so that when the guide cylinder 11 is inserted into the outer circumference of the cylinder 1, the spring 4 is inserted.
The first spring receiving member 5 and the guide cylinder 11 can be mounted on the cylinder 1 easily and quickly without applying an initial load to the cylinder 1.

[0040]

As described above, according to the first aspect of the present invention, the first spring bearing member and the second spring bearing member provided on each of the cylinder and the piston rod are interposed between the first spring bearing member and the second spring bearing member. A spring for urging the cylinder and the piston rod in the extending direction, a ring plate-shaped holder that constitutes the first spring receiving member on the cylinder side, a tubular cover attached to the holder, and the inside of the tubular cover. And a cylindrical cam member having a cam surface formed on one end surface thereof, and a protrusion member provided on the outer periphery of the cylindrical cam member inserted into the holder and the cylindrical cam member so as to slidably contact the cam surface. A guide tube is provided, and by inserting the guide tube into the outer periphery of the cylinder while compressing the spring by the holder, the locking projection is fitted in the locking notch on the guide tube. Be crowded With this configuration, one end of the spring can be stably supported on the flat surface of the holder, and the spring can be compressed and mounted on the outer circumference of the cylinder, and the spring can be mounted securely and inexpensively without using a special jig. There is an effect that what can be realized is obtained.

Further, according to the invention of claim 2, since the cylindrical guide is configured to have a length for guiding and supporting the inner circumference of the spring at the maximum extension of the spring, the first guide of the spring is provided.
There is an effect that it is possible to obtain a structure in which the spring receiving member can be mounted more quickly and easily.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a shock absorber according to an embodiment of the present invention.

2 is a left side view of the shock absorber shown in FIG. 1. FIG.

3 is a cross-sectional view showing a first spring receiving member in FIG.

4 is a side view of the first spring bearing member shown in FIG. 3. FIG.

5 is a development view of the tubular cam member shown in FIG.

6 is a development view of the cylindrical cover shown in FIG.

7 is a cross-sectional view of the guide cylinder shown in FIG.

FIG. 8 is a front view of the guide cylinder shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston rod 3 Locking protrusion 4 Spring 5 First spring receiving member 6 Second spring receiving member 7 Holder 8 Cylindrical cover 9 Cylindrical cam member 9b Cam surface 11 Guide cylinder 12 Projecting member 13 Locking notch

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshihiro Yamada 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd. (72) Inventor Yasushi Ishii 2-chome, Hamamatsucho, Minato-ku, Tokyo No. 4-1 World Trade Center Building, Kayaba Industry Co., Ltd. (72) Inventor, Tadashi Shiro, No. 4-1, Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd. (72) Inventor Shinichi Nishida Tokyo 2-4-1, Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd.

Claims (2)

[Claims] 1. A first spring receiving member and a second spring receiving member respectively provided on a cylinder and a piston rod that expand and contract to absorb impact, and a locking projection provided on the outer periphery of the cylinder. And a spring interposed between the first spring receiving member and the second spring receiving member for urging the cylinder and the piston rod in the extending direction, and the first spring receiving member on the cylinder side. A ring-plate-shaped holder that supports one end of the spring, a tubular cover attached to the holder, a tubular cam member provided in the tubular cover and having a cam surface on one end surface, the holder, A guide tube that is inserted into the tubular cam member and has a protruding member provided on the outer periphery so as to slidably contact the cam surface, and the guide tube while the spring is compressed by the holder. And a locking notch on the guide cylinder into which the locking projection fits by being inserted into the outer periphery of the shock absorber. 2. The shock absorber according to claim 1, wherein the tubular guide has a length that guides and supports the inner circumference of the spring when the spring is maximally extended.