JPH075306Y2 - Suspension spring locking structure of hydraulic shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a suspension spring locking structure for a hydraulic shock absorber.

(Prior Art) As a hydraulic shock absorber used in a motorcycle or the like, for example, an inner tube is slidably inserted from below into an outer tube, and a cylinder attached to the outer tube is inserted into the inner tube. Insert the piston rod from below into the cylinder, and install the piston that is in sliding contact with the inner peripheral surface of the cylinder at the tip of this piston rod, and between the outer peripheral surface of the cylinder and the bottom cap attached to the lower end of the inner tube. It is known that a suspension spring is interposed in the suspension spring, and a return spring is fitted above the suspension spring.

In such a hydraulic shock absorber, two stopper rings are fitted on the outer peripheral surface of the cylinder at intervals, and spring seats are fitted on the upper side and the lower side of these stopper rings, respectively. The spring seat is caulked and fixed to the stopper ring, and the suspension spring and the return spring are locked by these spring seats.

(Problems to be Solved by the Invention) In the suspension spring locking structure of the hydraulic shock absorber described above, the cylinder is deformed due to the spring load being received by the small-diameter stopper ring, and two cylinders are provided on the outer peripheral surface of the cylinder. The distance between the spring receiving surfaces of each spring seat (so-called l length) in order to separate and secure the spring seats vertically
In order to lengthen the stroke length and lengthen the stroke length, it is necessary to lengthen the total length of the shock absorber, and there are two crimping points to crimp the spring seat to the stopper ring.
It is difficult to perform the crimping process because it is located at a point and the crimped points are close to each other.

(Means for Solving Problems) In order to solve the above problems, according to the present invention, a cotter divided into two is fitted in a groove formed on the outer peripheral surface of the cylinder, and the cotter is fixed to the cylinder by a cover. An end portion of this cover was swaged into a groove formed on the outer peripheral surface of the grooved member that was brought into contact with the cotter, and one end of the suspension spring was locked by this cover.

(Function) A grooved member is fitted to one end surface side of the cotter fitted to the cylinder outer peripheral surface, the outer peripheral surface of the cotter is covered with a cover, and one end of the cover is caulked and fixed in the groove of the grooved member. Because I did
There is only one caulking point, which simplifies machining, and one end of the suspension spring can be locked with the cover, and one end of the return spring can be locked with the grooved member. Stroke length can be extended with shorter overall length.

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

FIG. 1 is a sectional view of an essential part of a hydraulic shock absorber to which a suspension spring locking structure according to the present invention is applied, FIG. 2 is an enlarged sectional view of an essential part of FIG. 1, and FIG. 3 is a suspension spring member of FIG. FIG. 4 is an enlarged cross-sectional view of a portion related to the stop structure, and FIG. 4 is an exploded perspective view of FIG.

In this hydraulic shock absorber, an inner tube 2 is slidably inserted into an outer tube 1 from below, and a bush 3 which is slidably contacted with an outer peripheral surface of the inner tube 2 is fitted to an inner peripheral surface of a lower end portion of the outer tube 1. A bush 4 that is in sliding contact with the inner peripheral surface of the outer tube 1 is fitted on the outer peripheral surface of the upper end portion of the inner tube 2.

A case 5 is screwed to the upper end of the outer tube 1, and an upper end of a cylinder 6 desired in the inner tube 2 is screwed to the lower end of the case 5. Inner tube 2
A bracket 7 for mounting an axle is mounted on the outer periphery of the lower end of the inner tube 2, and an oil lock piece 8 is fitted on the inner periphery of the lower end of the inner tube 2. The oil lock piece 8 is attached to the bracket 7 by a bottom bolt 9. The bottom end of the hollow rod 10 is fixed to the bottom bolt 9 by screwing, and the tip of the hollow rod 10 is exposed inside the cylinder 6.

A hollow piston support member 11 is attached to the tip of the hollow rod 10, and a piston 12 that slides in contact with the inner peripheral surface of the cylinder 6 is attached to the piston support member 11. Forming the passage 13 and the extension side oil passage 14,
A compression side valve 15 and an expansion side valve 16 for opening and closing the compression side oil passage 13 and the expansion side oil passage 14 are mounted. Also,
A needle 17 is inserted into the hollow rod 10 so as to move back and forth, and the lower end of the needle 17 is attached to an adjuster piece 18.

A rod guide 21 is screwed onto the inner periphery of the lower end of the cylinder 6, and an oil lock collar is attached to the lower end of the cylinder 6.
20 is loosely fitted, and a hollow rod is attached to the inner peripheral surface of this rod guide 21.
10 Fit the bush 22 that is in sliding contact with the outer peripheral surface, and
An oil seal 23, which is in sliding contact with the outer peripheral surface of the hollow rod 10, is fitted above 21.

Further, the case 5 screwed to the upper end of the outer tube 1.
A fork bolt 25 is screwed onto the upper end of the hollow shaft 26, and the upper end of the hollow shaft 26 is fixed to the fork bolt 25 so that the hollow shaft 26 hangs down inside the case 5. A hollow piston support member 27 is fitted to the lower end of the hollow shaft 26, and a piston 28 which is in contact with the inner peripheral surface of the cylinder 6 via an O-ring is fitted to the lower end of the piston support member 27. A compression side valve that forms a compression side oil passage 30 and an extension side oil passage 31 in the piston 28 and opens and closes the compression side oil passage 30 and the extension side oil passage 31.
32 and extension side valve 33 are fitted. A needle 34 is screwed inside the hollow shaft 26 so as to be able to move back and forth.

Then, a groove 36 is formed on the outer peripheral surface of the case 5, and the groove 36 is formed.
An oil hole 37 is formed to connect 36 to the inside, and a diaphragm 38 that slidably contacts the inner peripheral surface of the case 5 and the outer peripheral surface of the hollow shaft 26 is fitted in the case 5, and the diaphragm 38 and the fork bolt 25 are connected to each other. A spring 39 is interposed between them to pressurize the hydraulic oil in the cylinder 6. Further hollow shaft 26
The intermediate portion of the is a reduced diameter portion 26a having a small outer peripheral surface.

Further, as shown in FIGS. 3 and 4, an annular groove 40 is formed on the outer peripheral surface of the cylinder 6, and the cotters 41, 41 divided into two are fitted into the annular groove 40. By mounting a cover 42 fitted from below the cylinder 6 on the outer peripheral surface of the cotter 41, the cotters 41, 41 are fixed to the cylinder 6, and on the upper side of the cotters 41, 41, the outer peripheral surface of the cylinder 6 and the cover 42 are fixed.
A grooved member 43 is fitted between the inner peripheral surface and the inner peripheral surface (state shown in the right half of FIG. 3), and the upper end portion of the cover 42 is caulked to the groove 44 formed on the outer peripheral surface of these grooved members 43. (The state shown in the left half of FIG. 3), these cotter 41, cover 42 and grooved member 43
Is fixed to the outer peripheral surface of the cylinder 6.

Then, the lower end surface of the cover 42 locks the upper end of a suspension spring 46 interposed between a spring receiver 45 mounted on the outer peripheral surface of the upper end portion of the oil lock collar 8, and the return spring is provided on the grooved member 43. 47 are installed.

Since the suspension spring locking structure as described above is used, the cover 42 is only caulked to the grooved member 43, and the caulking portion is only one place, so that the caulking process is easy and the suspension spring 46 is Since the distance between the spring receiving surface which is the lower end surface of the receiving cover 42 and the spring receiving surface which is the upper surface of the grooved member 43 which receives the return spring 47, so-called l length, is shortened, the total length of the shock absorber is shortened and the stroke length is shortened. Therefore, the load of the suspension spring 46 is received by the cylinder 6 via the cotter 41 fitted to the cylinder 6, and the deformation of the inner diameter of the cylinder 6 is reduced.

Further, in the hydraulic shock absorber configured as described above, the hydraulic oil in the oil chamber S1 adheres to the outer peripheral surface of the hollow rod 10 due to the expansion and contraction movement, and the hydraulic oil adhered to the outer peripheral surface of the hollow rod 10 moves to the cylinder 6 Since the oil seal 23 is directional, a small amount of oil flows into the in-cylinder oil chamber S2 via the oil seal 23, and the amount of hydraulic oil in the oil chamber S2 increases over a long period of time.

When hydraulic oil is thus accumulated in the oil chamber S2 and the internal pressure increases, friction increases through the seal portion.However, in this hydraulic shock absorber, the hydraulic oil flowing into the oil chamber S2 increases. Is the diaphragm 38 of the case 5 through the piston 28.
Flows into the lower space S3 and gradually pushes up the stroke center of the diaphragm 38. Then, when the diaphragm 38 is pushed up to the position of the reduced diameter portion 26a of the hollow shaft 26,
The hydraulic oil in the space S3 passes between the inner diameter seal portion of the diaphragm 38 and the reduced diameter portion 26a of the hollow shaft 26, returns to the oil chamber S1 again through the oil hole 37 and the groove 36 of the case 5, Since the internal pressure of the in-cylinder oil chamber S2 is reduced, an excessive change in friction and damage to each part are prevented.

As described above, according to the present invention, the cotter is fitted in the groove formed on the outer peripheral surface of the cylinder, and the cotter is fixed to the cylinder by the cover. The cover is fastened to the groove formed on the outer peripheral surface of the grooved member, and one end of the suspension spring is locked by this cover, so there is only one crimping point and the machining is simple. Since one end of the spring can be locked and one end of the return spring can be locked by the grooved member, the distance between the spring receiving surfaces can be shortened, and the stroke length can be increased with a short overall length.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a hydraulic shock absorber to which a suspension spring locking structure according to the present invention is applied, FIG. 2 is an enlarged sectional view of an essential part of FIG. 1, and FIG. 3 is a suspension spring member of FIG. FIG. 4 is an enlarged cross-sectional view of a portion related to the stop structure, and FIG. 4 is an exploded perspective view of FIG. In the drawings, 1 is an outer tube, 2 is an inner tube, 5 is a case, 6 is a cylinder, 10 is a hollow rod, 12
Is a piston, 26 is a hollow shaft, 38 is a diaphragm, 40
Is a groove of a cylinder, 41 is a cotter, 42 is a cover, 43 is a grooved member, 44 is a groove of a grooved member, 46 is a suspension spring, and 47 is a return spring.

Claims (1)

[Scope of utility model registration request] 1. A hydraulic shock absorber in which an inner tube is slidably inserted into an outer tube, a cylinder attached to the outer tube is inserted into the inner tube, and a suspension spring is attached to the outer peripheral surface of the cylinder. A groove is formed on the outer peripheral surface of the cylinder, a cotter divided into two is fitted in the groove, a cover is attached to the outer peripheral surface of the cotter and fixed to the cylinder, and the cotter is attached to the outer peripheral surface of the cylinder. The grooved member is brought into contact with the grooved member, one end of the cover is swaged to the groove formed on the outer peripheral surface of the grooved member, and one end of the suspension spring is locked by the cover. Suspension spring locking structure.