JP3080213B2 - Hydraulic shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic shock absorber used for a vehicle or the like, and more particularly to a compression damping force adjusting mechanism.

[0002]

As a conventional hydraulic shock absorber used in the Background of the vehicle or the like, JP-58-1 9 1343 JP Shosai techniques have been known. This technology, as described in the gazette,
The piston fixed to the tip of the piston rod is slidably inserted into the cylinder to define the inside of the cylinder into two oil chambers, and a partition wall is formed in one end of the cylinder in the oil chamber in front of the piston rod in the oil chamber in the cylinder. A member is provided to define an oil chamber in the cylinder and an oil reservoir. A flow path (port) for communicating the oil chamber and the oil reservoir in the cylinder is formed in the partition member, and a valve mechanism for generating a damping force upon compression of the port of the partition member, and a damping force during the compression Is provided.

[0003]

However, in the above-mentioned conventional damping force adjusting mechanism for a hydraulic shock absorber, it is necessary to dispose a partition member, a valve mechanism, and a needle mechanism in the cylinder in the axial direction. The basic length of the hydraulic shock absorber (mounting length-stroke) is increased by the space for mounting the partition member and the valve mechanism. For this reason, for example, in the case of a motorcycle, there is a vehicle type in which the space between the frame mounting portion and the swing arm mounting portion is restricted. Can not.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is characterized in that an opening at one end of a cylinder is provided.
The piston rod is slidably inserted and provided at the other end
Attach mounting holes in the mounting section in a direction perpendicular to the cylinder axis.
To communicate with the oil chamber inside the cylinder outside the cylinder
Hydraulic shock absorber provided with a cylindrical sub tank having an oil reservoir
In the above, the mounting portion of the cylinder, or the end of the cylinder
A cylindrical portion is provided integrally on the outer periphery substantially in parallel with the mounting hole,
An oil chamber in the cylinder and the subtan are provided in the cylindrical portion.
A partition member having a flow path communicating with the oil sump chamber is provided.
A pressure-side damping force that generates a pressure-side damping force
Force generation mechanism and compression side damping force adjustment mechanism for adjusting compression side damping force
Provided on the outer periphery of the cylindrical portion of the cylindrical sub-tank
Place the sub tank so that at least a part of the outer circumference overlaps.
It is characterized by being provided substantially parallel to the cylindrical portion .

According to a second aspect of the present invention, in the first aspect, the pressure-side reduction is performed.
The damping force adjusting mechanism is a bi-layer formed parallel to the flow path of the partition wall member.
Equipped with a needle valve to adjust the opening area of the path flow path
It is characterized by being .

According to the above means, the cylinder mounting portion,
Alternatively, a partition member provided integrally with a cylindrical portion on the outer periphery of the end of the cylinder substantially in parallel with the mounting hole, and in the cylindrical portion, a partition member formed with a flow path communicating the oil chamber in the cylinder and the oil reservoir in the sub-tank. Since the partition member is provided with a compression-side damping force generation mechanism for generating the compression-side damping force and a compression-side damping force adjustment mechanism for adjusting the compression-side damping force, the basic length of the shock absorber can be reduced, which is restricted. It is possible to install it in the installation space, it is easy to adjust the damping force from the side of the vehicle body, and the outer circumference of the cylindrical sub tank is mounted on the outer circumference of the cylindrical part
The sub-tank so that at least a part of
Since it is provided almost parallel to the cylindrical part, between the cylindrical part and the sub tank
Piping is not required, and separate pipe material is not required.
You.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Figure 1 is half-cut front view of a hydraulic shock absorber according to a reference example of the present invention, FIG. 2 is a fragmentary enlarged half-cut front view of the damper of Figure 1, Figure 3 is a fragmentary enlarged cross-sectional plan view of the damper of Figure 1, Figure 4 is a sectional view of the piston of the damper of Figure 1, Figure 5 is ginseng
Bottom view of the piston of the Reference Example, FIG. 6 is half-cut front view of a hydraulic shock absorber according to the present invention, FIG. 7 is a plan view of a hydraulic shock absorber according to the present invention, FIG. 8 A-A line enlarged sectional view of FIG. 6 It is.

In FIG. 1, reference numeral 1 denotes a cylinder;
A hollow rod 7 is inserted into the inside of the cylinder 1 from below via a cap 2, a rod guide 3, an oil seal 4, a retainer 5, and a rebound rubber 6, and the tip of the hollow rod 7 slides on the inner peripheral surface of the cylinder 1. The inside of the cylinder 1 was axially partitioned by the piston 10
Two oil chambers S1 and S2 are defined.

As shown in FIGS. 4 and 5, the piston 10 is provided with four pressure-side oil passages 11 in the axial direction, and four obliquely from the outer peripheral side of the piston toward the inner peripheral side. Are provided. By forming the extension-side oil passages 12 in this manner, hydraulic oil flows out so as to swirl around the hollow rod 7, and a rectifying effect is exhibited.

On the lower surface side of the piston 10, a pressure side valve 13 composed of a plurality of disc valves for opening and closing the pressure side oil passages 11 is provided. An extension side valve 14 including a plurality of disk valves that open and close is provided.

An axle mounting member 15 for mounting an axle is mounted on the lower end of the hollow rod 7, a spring seat stopper 16 is mounted on the upper surface of the axle mounting member 15, and a stopper is mounted on the spring seat stopper 16. 17 and an under spring seat 18 also serving as a spring guide is mounted from above the peripheral edge of the spring seat stopper 16. Further, a needle rod 22 for adjusting the opening amount of a bypass oil passage 21 that bypasses the piston 10 is inserted into the hollow rod 7 so as to be able to advance and retreat, and the needle rod 22 is inserted into the mounting member 15.
The adjuster 23 for moving back and forth is mounted so as to freely move back and forth.

On the other hand, a collar 25 is provided at the upper end of the cylinder 1.
And an attachment member 26 for attachment to the vehicle body is screwed, and an attachment portion 26a is provided at an upper end portion of the attachment member 26 so as to protrude outward in the axial direction integrally, and a pillow ball is attached to the attachment portion 26a. A joint collar 29 is held via a bearing 27 and a pillow ball 28.
Attachment part 26 provided at the end axial direction outside of attachment member 26
a, and the joint collar 29 inserted into the mounting portion 26a, as shown in FIGS. 1 to 3, extends on the extension of the axis of the cylinder 1 outside the end of the cylinder 1 so as to be orthogonal to the axis. Mounting hole 29a for joint collar 29
Is provided on the extension of the cylinder axis so as to be orthogonal to the axis.

The outside of the end of the mounting member 26 is parallel to the mounting hole 29a of the joint collar 29,
A cylindrical portion 31 having a hollow hole 31a whose one end is blind and having an oil passage 31b communicating with the in-cylinder oil chamber S1 is integrally formed. The joint collar 2 of the cylindrical portion 31
A joint bolt 32 facing the inside of the hollow hole 31a is mounted on the outer peripheral side opposite to the side having the joint 9 in a direction orthogonal to the hollow hole.
The sub-tank 34 is connected to the sub-tank 3 so that the inside of the hollow hole 31a of the cylindrical portion 31 communicates with the oil reservoir S3 defined by the bladder 35 of the sub-tank 34.

A partition member 41 defining an oil chamber S1 in the cylinder and an oil reservoir S3 of the sub-tank 34 is fitted into the hollow hole 31a of the cylindrical portion 31, and the oil chamber S1 in the cylinder is inserted into the partition member 41. Port 4 that communicates with the sub tank 34
A pressure-side damping force generating mechanism for generating a pressure-side damping force by providing a valve 44 composed of a plurality of disc valves for opening and closing the flow path 42 on both surfaces and a valve 45 for opening and closing the flow path 43 is formed on both surfaces. I do. The partition member 41 and the valves 44 and 45 are fixed to the outer peripheral surface of the distal end of the hollow center piece 46.

In the center piece 46, a port 42,
A bypass oil passage 47 that bypasses the oil passage 43 is formed in the axial direction, and an oil passage 47a that forms a part of the bypass oil passage 47 is formed on the inner peripheral surface of the center piece 46 on the side, and the opening amount of the bypass oil passage 47 A needle valve 48 for adjusting the pressure is screwed on the inner periphery of the center piece 46 so as to be able to advance and retreat.
Adjuster 49 for rotating this needle valve 48
Is rotatably fitted in the cap 52 and the center piece 46 to form a compression-side damping force adjustment mechanism. A click mechanism 50 is interposed between the adjuster 49 and the center piece 46.

A cap 52 is screwed onto the rear end of the outer peripheral surface of the center piece 46, and this cap 52 is
A valve seat 51 having an oil passage 51a communicating with a part of an oil passage 47a of a bypass oil passage 47 is fitted in an intermediate portion of an outer peripheral surface of the center piece 46 by being screwed to the valve seat 51. , The extremely low speed valve 5
2 is provided. The extremely low speed valve 52 controls the hydraulic oil that has passed through the needle valve 48 so that the damping force at an extremely low speed has a 2/3 power characteristic, thereby preventing a feeling of squash due to no attenuation at an extremely low speed. It is for.

On the outer peripheral surface of the lower end of the mounting member 26,
The upper spring seat 55 is screwed and fixed with a lock nut 56, and a suspension spring 57 is provided between the upper spring seat 55 and the under spring seat 18.
Intervene.

In the hydraulic shock absorber constructed as described above, as the hollow rod 7 rises in the compression stroke, hydraulic oil equivalent to the volume of the hollow rod 7 that has entered enters the cylinder oil chamber S1 through the hole 31b. The valve 44 flows into the hollow hole 31 a of the cylindrical portion 31, passes through the flow path 42 of the partition member 41, and
To open the joint bolt 32 and the pipe member 3
3 flows into the oil reservoir S3 of the sub tank 34.

At this time, the valve 4 provided on the partition member 41
At 4, a compression damping force is generated. A part of the hydraulic oil flowing into the hollow hole 31a of the cylindrical portion 31 flows into the oil reservoir S3 by bypassing the valve 44 in accordance with the opening amount of the bypass oil passage 47, so that the adjuster 49 is rotated. By moving the needle valve 48 forward and backward to adjust the opening amount of the bypass oil passage 47, the pressure-side damping force generated can be adjusted.

From this state, when the hollow rod 7 moves down to the extension stroke, the hollow rod 7
Hydraulic fluid equivalent to the exit volume of
Hydraulic oil in the oil reservoir S3 of the sub tank 34 flows from the pipe member 33 into the hollow hole 31a of the cylindrical portion 31, pushes and opens the valve 45 from the flow path 43 of the partition member 41, and enters the cylinder oil chamber S1. Inflow.

In the compression stroke, the hydraulic oil in the oil chamber S1 in the cylinder 1 pushes and opens the pressure side valve 13 through the pressure side oil passage 11 of the piston 10, and flows into the oil chamber S2 to generate a damping force. I do. In the extension stroke, the hydraulic oil in the oil chamber S2 in the cylinder 1
2, the extension side valve 14 is pushed open and flows into the oil chamber S1 to generate a damping force.

In the pressure-side damping force generating mechanism of the hydraulic shock absorber, a cylindrical portion 31 is formed on the outer peripheral side of the mounting member 26, and the partition member 4 is formed in a hollow hole 31a of the cylindrical portion 31.
1. Since the valve 44 for generating the compression-side damping force is provided, the basic length of the shock absorber is set to the cylinder 1
Is shorter than the case of disposing in the axial direction. A hollow hole 31a of the cylindrical portion 31 is formed in a direction substantially perpendicular to the axis of the cylinder, and a bypass oil passage 47 in the center piece 46 and a needle valve 4 are formed in the axial direction of the hollow hole 31a.
8, since the compression side damping force adjusting mechanism including the adjuster 49 and the like is inserted, the damping force can be adjusted from the side of the cylinder, so that the operation becomes easy.

When the hollow hole 31a of the cylindrical portion 31 is formed in parallel with the hole 29a of the joint collar 29 of the mounting member 26, the hole 29a of the joint collar 29 and the hollow hole 31a of the cylindrical portion 31 are formed in the same direction. Since processing can be performed, processing time is reduced.

In the above-described embodiment, the example in which the cylindrical portion is formed integrally with the mounting member for mounting the cylinder to the vehicle body has been described. However, the cylindrical portion may be formed integrally with the cylinder itself. And may be integrally formed at a position on both of the cylinder and the cylinder.

FIG. 6 is a partially cutaway front view of the hydraulic shock absorber according to the present invention , FIG. 7 is a plan view of the hydraulic shock absorber, and FIG.
FIG. 4 is an enlarged sectional view taken along a line , showing components shown in the above-described reference example.
The same members as those described above are denoted by the same reference numerals and description thereof will be omitted.

That is, in the present invention, the sub-tank 34 is mounted so that the outer periphery thereof directly overlaps the outer periphery of the cylindrical portion 31.
The oil chamber S3 in the sub tank 34 and the oil chamber in the cylindrical portion 31 communicate with each other via an oil passage 36, and the pipe member 33 of the above embodiment is omitted. Further, in this embodiment, an initial load is applied to the valve 44 that generates the compression side damping force by the retainer 38 urged by the spring 37.

The sub-tank 34 partially overlaps the cylinder 26 or the mounting member 26 by T1 in the axial direction of the cylinder 26, and overlaps the cylindrical portion by T2 in the direction intersecting with the axis of the cylinder 26. It was provided integrally with the cylindrical part.

[0028]

According to the present invention as described above,
According to the first aspect, the piston rod is opened from one end of the cylinder.
The head is slidably inserted into the mounting section at the other end.
A mounting hole is provided in the direction perpendicular to the axis of the
Oil reservoir inside the cylinder that communicates with the oil chamber in the cylinder
Hydraulic shock absorber with a cylindrical sub-tank
Attach the cylindrical part around the attachment part of the cylinder or the end of the cylinder.
It is provided integrally and substantially parallel to the mounting hole, and a cylinder is
For communicating between the oil chamber in the oil tank and the oil reservoir in the sub tank
The partition member with the formed is arranged, and the partition member has a compression damping force.
Pressure damping force generation mechanism and pressure damping force
A compression side damping force adjustment mechanism is provided.
So that at least a part of the outer periphery of the sub tank overlaps
The sub tank was provided substantially parallel to the cylindrical portion. In the present invention
Is to make the sub tank cylindrical, and the sub tank
So that at least a part of the outer circumference of
The oil chamber in the cylinder and the sub
There is no need for a pipe member connecting the oil reservoir in the tank
It is possible. In addition, the cylindrical part and part of the cylindrical subtank are heavy.
And the overlapping cross-sectional area of the cylindrical part and the cylindrical sub-tank is large.
The joint strength between the cylindrical part and the cylindrical sub tank
growing. In addition, the outer periphery of the cylindrical part is also outside the cylindrical sub tank.
At least part of the circumference overlaps and the sub tank
Since the sub tank is provided almost parallel to the cylinder,
It is possible to shorten the basic length of the shock absorber while providing it outside the end.
Hydraulic system with a damping force adjustment mechanism integrated outside the cylinder
It is possible to make the whole shock absorber compact .

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a hydraulic shock absorber according to a reference example of the present invention.

FIG. 2 is an enlarged half cut front view of a main part of the shock absorber of FIG . 1;

FIG. 3 is an enlarged plan sectional view of a main part of the shock absorber of FIG . 1;

FIG. 4 is a sectional view of a piston of the shock absorber of FIG . 1;

FIG. 5 is a bottom view of a piston of a reference example .

FIG. 6 is a partially cutaway front view of the hydraulic shock absorber according to the present invention .

FIG. 7 is a plan view of a hydraulic shock absorber according to the present invention .

FIG. 8 is an enlarged sectional view taken along line AA of FIG. 6;

[Explanation of symbols]

1 ... cylinder, 7 ... piston rod, 10 ... piston,
26 mounting member, 26a mounting portion, 31 cylindrical portion,
34 ... sub tank, 41 ... partition member, 42 ... flow path, 44
... Valve, 47 ... Bypass oil passage, 48 ... Needle valve, 49 ... Adjuster, S1 ... Cylinder oil chamber, S3 ...
Oil reservoir.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-191343 (JP, A) JP-A-5-126197 (JP, A) JP-A 64-17046 (JP, U) JP-A 64-64 17047 (JP, U) Japanese Utility Model 3-29738 (JP, U) Japanese Utility Model 1-131044 (JP, U) Japanese Utility Model Utility Model 1-67346 (JP, U) Japanese Utility Model Utility Model 63-91739 (JP, U) 58-137142 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 9/00-9/58

Claims (2)

(57) [Claims] 1. A piston rod is provided through an opening at one end of a cylinder.
The head is slidably inserted into the mounting section at the other end.
A mounting hole is provided in the direction perpendicular to the axis of the
Oil reservoir inside the cylinder that communicates with the oil chamber in the cylinder
In a hydraulic shock absorber provided with a cylindrical sub-tank , a circle is formed around a mounting portion of the cylinder or an outer periphery of an end of the cylinder.
A cylinder is provided integrally and substantially parallel to the mounting hole, and an oil chamber in the cylinder and the subtan are provided in the cylinder.
A partition member having a flow path communicating with the oil sump chamber is provided.
A pressure-side damping force generating a pressure-side damping force on the partition member.
A compression side damping force adjustment mechanism for adjusting the compression side damping force
Only, few of the outer periphery of the cylindrical sub-tank on the outer periphery of the cylindrical portion
Attach the sub-tank to the cylindrical part so that at least
A hydraulic shock absorber provided substantially in parallel with the hydraulic shock absorber. 2. The pressure-side damping force adjusting mechanism includes a partition member.
Adjust the opening area of the bypass flow path formed parallel to the flow path
A needle valve, comprising:
2. The hydraulic shock absorber according to 1.