JPH0573334U - Damping force adjustment mechanism for hydraulic shock absorber - Google Patents

Abstract

(57) [Summary] [Purpose] To shorten the basic length while ensuring the stroke length of the shock absorber. [Structure] Mounting member 2 mounted on one end of cylinder 1
A bulging portion 31 is formed on the outer peripheral side of 6 and the bulging portion 31 is formed.
The cylinder internal oil chamber S1 and the sub tank 3 in the hollow hole 31a of
The partition wall member 41 which separates the oil reservoir chamber S3 of No. 4 is inserted and inserted into the partition wall member 41.
And a valve 44 that opens and closes the flow path 42, and the bypass oil passage 4 is provided in the center piece 46.
7 is formed in the axial direction, and a needle valve 48 that adjusts the opening amount of the bypass oil passage 47 and an adjuster 49 that advances and retracts the needle valve 48 are screwed so as to move back and forth.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a damping force adjusting mechanism for a hydraulic shock absorber used in a vehicle or the like, and particularly to a compression side damping force adjusting mechanism.

[0002]

[Prior Art]

 As a conventional hydraulic shock absorber used in a vehicle or the like, as described in Japanese Patent Application Laid-Open No. 58-101343, a piston fixed to the tip end of a piston rod is slidably inserted into a cylinder to be mounted in a cylinder. Two oil chambers are defined, and a partition member is provided in the cylinder one end of the oil chamber on the piston rod front side of the cylinder oil chamber to define the cylinder oil chamber and the oil reservoir chamber. A valve mechanism that forms a flow path (port) that connects the inner oil chamber and the oil sump chamber to generate a damping force at the port of this partition member and a needle mechanism that adjusts the damping force at the time of compression are provided. There is one provided.

[0003]

[Problems to be solved by the device]

 However, in the conventional damping force adjusting mechanism of the hydraulic shock absorber described above, since the partition member, the valve mechanism, and the needle mechanism are arranged in the cylinder in the axial direction, the space for installing the partition member and the valve mechanism is set. The basic length of the hydraulic shock absorber (mounting length-stroke) is lengthened accordingly. For this reason, for example, in some motorcycles, the space between the frame mounting part and the swing arm mounting part is restricted, but it is recommended to install it in such a model where the hydraulic shock absorber mounting space is restricted. I can't.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention forms a hollow bulge portion integrally with a mounting member for mounting a cylinder on a vehicle body or an axle or on the outer peripheral side of the cylinder in a direction intersecting the axis line of the cylinder. A partition member, a compression-side damping force generating mechanism, and a compression-side damping force adjusting mechanism are arranged in the section.

[0005]

[Action]

 The damping force generating mechanism and the damping force adjusting mechanism are arranged laterally of the mounting member or the cylinder, that is, in a hollow bulge formed so that at least a part of the mounting member or the cylinder overlaps the mounting member or the cylinder in the upward and downward directions. The basic length of the shock absorber can be shortened, it can be installed in a restricted installation space, and the damping force adjustment operation becomes easy.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a half sectional view of a hydraulic shock absorber according to the present invention, FIG. 2 is an enlarged half sectional view of an essential part of the shock absorber, and FIG. 3 is an enlarged plan sectional view of an essential part of the shock absorber. Is a sectional view of the piston of the shock absorber, and FIG. 5 is a plan view of the piston.

A hollow rod 7 is inserted into 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 inside of the cylinder 1 is inserted into the distal end of the hollow rod 7. A piston 10 which is in sliding contact with the peripheral surface is mounted to define two oil chambers S1 and S2 in the cylinder 1.

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

A pressure side valve 13 composed of a plurality of disc valves for opening and closing the pressure side oil passage 11 is provided on the lower surface side of the piston 10, and a plurality of discs for opening and closing the extension side oil passage 12 is provided on the upper surface side of the piston 10. The extension side valve 14 composed of a valve is attached and fixed.

Further, an axle mounting member 15 for mounting an axle is attached to the lower end of the hollow rod 7, a spring seat stopper 16 is attached to the upper surface of the axle mounting member 15, and a stopper bar 17 is provided on the spring seat stopper 16. In addition, an under spring seat 18 that also serves as a spring guide is attached from above the peripheral edge of the spring seat stopper 16. Furthermore, a needle rod 22 that adjusts the opening amount of a bypass oil passage 21 that bypasses the piston 10 is inserted into the hollow rod 7 so that the needle rod 22 can advance and retract, and an adjuster 23 that advances and retracts the needle rod 22 can be inserted into the mounting member 15. It is attached so that it can move back and forth.

On the other hand, a collar 25 is fitted on the upper end of the cylinder 1, and a mounting member 26 for mounting on the vehicle body is screwed on. A pillow ball bearing 27 and a pillow ball 28 are mounted on the upper end of the mounting member 26. It holds the joint collar 29 through.

Further, the mounting member 26 has a hollow hole 31a which is parallel to the mounting hole 29a of the joint collar 29 on the lateral side of the outer peripheral portion, and has an oil passage 31b which communicates with the in-cylinder oil chamber S1. 31 is integrally formed, a joint bolt 32 facing the inside of the hollow hole 31a is attached to the outer peripheral surface of the bulging portion 31, and a sub-tank 34 is connected to the joint bolt 32 via a pipe member 33 to expand the bulging portion 31. The inside of the hollow hole 31a of the outlet 31 is communicated with the oil reservoir S3 defined by the bladder 35 of the sub tank 34.

Further, a partition wall member 41 that separates the in-cylinder oil chamber S1 and the oil reservoir chamber S3 of the sub-tank 34 is fitted in the hollow hole 31a of the bulging portion 31, and the partition wall member 41 has an oil chamber inside the cylinder. The ports 42 and 43 that connect the S1 and the sub-tank 34 are formed, and a valve 44 composed of a plurality of disc valves that opens and closes the flow path 42 and a valve 45 that opens and closes the flow path 43 are provided on both sides to reduce the compression side damping force. A compression-side damping force generating mechanism for generating the pressure-side damping force is formed, and the partition wall member 41 and the valves 44 and 45 are fixed to the outer peripheral surface of the hollow center piece 46 at the front end.

A bypass oil passage 47 that bypasses the ports 42 and 43 is formed in the center piece 46 in the axial direction, and an oil passage 47 a that forms a part of the bypass oil passage 47 is formed laterally on the inner peripheral surface of the center piece 46. A needle valve 48 for adjusting the opening amount of the bypass oil passage 47 is screwed to the inner circumference of the center piece 46 so as to be able to move forward and backward, and an adjuster 49 for rotating the needle valve 48 is attached to the cap 52 and the center pin. The compression side damping force adjusting mechanism is configured by being rotatably fitted in the space 46. A click mechanism 50 is interposed between the adjuster 49 and the center piece 46.

A cap 52 is screwed to the rear end of the outer peripheral surface of the center piece 46, and the cap 52 is screwed to the bulging portion 31 to hold the center piece 46. A valve seat 51, in which an oil passage 51a communicating with a part of the oil passage 47a of the bypass oil passage 47 is formed, is fitted in the middle portion, and the valve seat 51 is provided with an extremely low speed valve 52. The extremely low speed valve 52 controls the hydraulic oil that has passed through the needle valve 48 so that the damping force at the extremely low speed has a 2/3 power characteristic to prevent the feeling of scathing due to no damping at the extremely low speed. It is for.

An upper spring seat 55 is screwed onto the outer peripheral surface of the lower end portion of the mounting member 26 and fixed with a lock nut 56. A suspension spring 57 is provided between the upper spring seat 55 and the under spring seat 18. It is installed.

In the hydraulic shock absorber configured as described above, as the hollow rod 7 rises in the compression stroke, the working oil corresponding to the advancing volume of the hollow rod 7 passes from the in-cylinder oil chamber S1 through the hole 31b, It flows into the hollow hole 31a of the bulging portion 31, passes through the flow path 42 of the partition member 41 to push open the valve 44, and flows into the oil reservoir S3 of the sub tank 34 through the joint bolt 32 and the pipe member 33.

At this time, a compression side damping force is generated by the valve 44 provided on the partition wall member 41. Then, a part of the hydraulic oil flowing into the hollow hole 31a of the bulging portion 31 bypasses the valve 44 according to the opening amount of the bypass oil passage 47 and flows into the oil reservoir S3. It is possible to adjust the compression side damping force generated by rotating the needle valve 48 to move the needle valve 48 forward and backward and adjusting the opening amount of the bypass oil passage 47.

When the hollow rod 7 descends after shifting from this state to the extension stroke, the hydraulic oil equivalent to the withdrawal volume of the hollow rod 7 becomes insufficient in the cylinder 1, so that the oil reservoir chamber of the sub-tank 34 is The hydraulic oil in S3 flows from the pipe member 33 into the hollow hole 31a of the bulging portion 31, presses the valve 45 from the flow path 43 of the partition wall member 41, and flows into the in-cylinder oil chamber S1.

Further, in the compression stroke, the hydraulic oil in the oil chamber S1 in the cylinder 1 passes through the pressure side oil passage 11 of the piston 10 to push open the pressure side valve 13 and flow into the oil chamber S2 to generate a damping force. Then, in the extension stroke, the hydraulic oil in the oil chamber S2 in the cylinder 1 pushes the extension side valve 14 through the extension side oil passage 12 of the piston 10 to open the extension side valve 14 to flow into the oil chamber S1, thereby generating a damping force. ..

In the compression side damping force generating mechanism of the hydraulic shock absorber, the bulging portion 31 is formed on the outer peripheral side portion of the mounting member 26, and the partition wall member 41 is provided in the hollow hole 31 a of the bulging portion 31. Since the compression side damping force generating valve 44 is arranged, the basic length of the shock absorber is shorter than that in the case where the compression side damping force generating mechanism is arranged in the axial direction of the cylinder 1. Further, a hollow hole 31a of the bulging portion 31 is formed in a direction intersecting with the axis of the cylinder, and a bypass oil passage 47 in the center piece 46, a needle valve 48, an adjuster 49, etc. are formed in the axial direction of the hollow hole 31a. Since the compression side damping force adjusting mechanism is inserted, the damping force can be adjusted from the side of the cylinder, which facilitates the operation.

When the hollow hole 31a of the bulging 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 bulging portion 31 are formed from the same direction. Since it can be opened, the processing time can be shortened.

In the above embodiment, the bulging portion is integrally formed with the mounting member for mounting the cylinder on the vehicle body. However, the bulging portion may be integrally formed with the cylinder itself. You may integrally form in the position applied to both a member and a cylinder.

FIG. 6 is a half sectional view of a hydraulic shock absorber according to another embodiment, FIG. 7 is a plan view of a hydraulic shock absorber according to the other embodiment, and FIG. 8 is an enlarged cross-sectional view taken along line AA of FIG. Therefore, the same members as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

That is, in this embodiment, the sub-tank 34 is directly attached to the bulging portion 31, and the oil chamber S3 in the sub-tank 34 and the oil chamber in the bulging portion 31 are communicated with each other by the oil passage 36. The pipe member 33 of the 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 that is biased by the spring 37.

A part of the sub-tank 34 expands so as to overlap the cylinder 26 or the mounting member 26 by T1 in the axial direction of the cylinder 26, and a bulging part overlaps by T2 in the direction intersecting the axial line of the cylinder 26. It is integrated with the outlet.

[0027]

[Effect of the device]

 As described above, according to the present invention, the hollow bulging portion is formed on the side of the outer peripheral portion of the mounting member or the cylinder, and the damping force generating mechanism is arranged in the bulging portion. The basic length of the shock absorber can be shortened without affecting the length, and the shock absorber can be mounted in a restricted mounting space. Further, since the hollow hole of the bulging portion is formed in a direction intersecting the axis of the cylinder and the damping force adjusting mechanism is arranged in the axial direction of the hollow hole, the damping force adjusting operation becomes easy. Also, by providing the sub-tank integrally with the bulging part, the pipe member connecting the oil chamber in the bulging part and the oil reservoir in the sub-tank becomes unnecessary, and in particular, a part of the sub-tank is located in the cylinder axial direction. Alternatively, by overlapping the mounting member and the bulging portion in the direction intersecting the axis of the cylinder, the entire hydraulic shock absorber can be made compact.

[Brief description of drawings]

FIG. 1 is a half sectional view of a hydraulic shock absorber according to the present invention.

FIG. 2 is an enlarged half-sectional view of an essential part of the shock absorber.

FIG. 3 is an enlarged plan sectional view of an essential part of the shock absorber.

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

FIG. 5 is a plan view of the piston.

FIG. 6 is a half sectional view of a hydraulic shock absorber according to another embodiment.

FIG. 7 is a plan view of a hydraulic shock absorber according to another embodiment.

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

[Explanation of symbols]

1 ... Cylinder, 7 ... Hollow rod, 10 ... Piston, 26
... Mounting member, 31 ... Bulging portion, 34 ... Sub tank, 41
... partition member, 42 ... flow passage, 44 ... valve, 47 ... bypass oil passage, 48 ... needle valve, 49 ... adjuster, S
1 ... In-cylinder oil chamber, S3 ... Oil reservoir chamber.

Claims (5)

[Scope of utility model registration request] 1. An oil communicating with an oil chamber inside a cylinder, wherein one end of the cylinder is attached to one of a vehicle body and an axle via a mounting member, a piston rod inserted into the cylinder is attached to the other of the vehicle body and an axle, and the cylinder is connected to an oil chamber inside the cylinder. In a hydraulic shock absorber provided with a sub-tank in which a storage chamber is formed, a hollow bulging portion is integrally provided on a side of an outer peripheral portion of the mounting member or the cylinder in a direction intersecting with an axis of the cylinder, and the cylinder is provided in the bulging portion. A partition wall member that forms a flow path that connects the inner oil chamber and the oil reservoir is arranged, and a compression side damping force generation mechanism that generates a compression side damping force and a compression side damping force adjustment mechanism that adjusts the compression side damping force are provided in this partition member. A damping force adjusting mechanism for a hydraulic shock absorber, which is provided. 2. Oil which is attached to one of a vehicle body and an axle through a mounting member, a piston rod inserted into the cylinder is attached to the other of the vehicle body and an axle, and which communicates with an oil chamber in the cylinder outside the cylinder. In a hydraulic shock absorber provided with a sub-tank in which a storage chamber is formed, a hollow bulging portion is integrally provided on a side of an outer peripheral portion of the mounting member or the cylinder in a direction intersecting with an axis of the cylinder, and the cylinder is provided in the bulging portion. A partition wall member that forms a flow path that connects the inner oil chamber and the oil reservoir is arranged, and a compression side damping force generation mechanism that generates a compression side damping force and a compression side damping force adjustment mechanism that adjusts the compression side damping force are provided in this partition member. Further, the sub tank is partially overlapped with the cylinder or the mounting member in the axial direction of the cylinder, and is partially overlapped with the bulging portion in the direction intersecting with the axial line of the cylinder. A damping force adjusting mechanism for a hydraulic shock absorber, which is provided integrally with a bulging portion. 3. The compression-side damping force adjusting mechanism comprises a needle valve for adjusting the opening area of a bypass flow passage formed in parallel with the flow passage of the partition wall member.
Alternatively, the damping force adjusting mechanism for the hydraulic shock absorber according to claim 2. 4. The damping force adjusting mechanism for a hydraulic shock absorber according to claim 1, wherein the hollow portion of the bulging portion is formed substantially parallel to the mounting hole of the mounting member. 5. The damping force adjusting mechanism for a hydraulic shock absorber according to claim 2, wherein the sub-tank is formed substantially parallel to the hollow portion of the bulging portion and the mounting hole of the mounting member.