JPH03204422A - Damping force adjusting mechanism of hydraulic shock absorber - Google Patents

Abstract

PURPOSE:To enable separate adjustment of compression-side and extension-side damping forces by arranging a compression-side ajdusting dial and an extension- side adjusting dial at one position and laying a mechanism which does not affect one with the other between the respective adjusting dials. CONSTITUTION:A push pipe 12 and a push rod 21 have a compression-side adjusting dial 19 and an extension-side adjusting dial 27, respectively, anchored. A spring 29 is inserted into a hole in the compression-side adjusting dial 19 and has the upper side and the lower side provided with balls 30, 31, respectively, with the former faced in a recessed portion 32 of the extension-side adjusting dial 27 and the latter in a recessed portion 33 of an upper bracket 28, which is formed somewhat larger than the recessed portion 32. The ball 30 is set on the compression-side adjusting dial 19, to provide the push rod 21 in the push pipe 12 with forth-and-back free movement. As a result, the compression- side adjusting dial 19 during compression-side damping adjustment and the extension-side adjusting dial 27 during extension-side damping adjustment are separately adjustable without affecting one another.

Description

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

(Prior Art) Conventionally, as a damping force adjustment mechanism of a hydraulic shock absorber used in a motorcycle or the like, for example, a needle is movably facing a bypass wave path that bypasses a piston part, and the needle is moved back and forth. There is one in which the damping force generated is adjusted by changing the opening amount of the bypass oil passage.

(Problem to be Solved by the Invention) However, in such a damping force adjustment mechanism, by moving the needle back and forth, the opening amount of the bypass oil passage changes by the same amount in both the compression stroke and the extension stroke. Therefore, the adjustment range of the compression-side damping force and the adjustment range of the extension-side damping force cannot be set separately.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a compression side adjustment dial and an expansion side dial at one location, and there is no space between each of these adjustment dials that affects the other. No mechanism was involved.

(Function) Since the compression side adjustment dial and the rebound side dial are arranged in one place with a mechanism that does not affect the other, the compression side damping force and the rebound side damping force can be adjusted individually with a simple configuration. It can be adjusted and is easy to operate.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a cross-sectional view of a hydraulic shock absorber equipped with a damping force adjustment mechanism according to the present invention, FIG. 2 is an enlarged view of the main parts of the shock absorber, and FIG. 3 is an enlarged cross-sectional view of the main parts of the shock absorber. .

A hollow rod 2 is inserted into the cylinder l from above, and a hollow rod end 3, which is a piston mounting member, is attached to the tip of the hollow rod 2. A piston 4 that is in contact with the cylinder 1 is attached to define the inside of the cylinder 1 into an upper oil chamber S1 and a lower oil chamber S2. The piston 4 is formed with a compression side oil passage 5 and a growth side oil passage 6, and a compression side valve 7 consisting of a plurality of disc valves for opening and closing the compression side oil passage S is installed on the upper surface of the piston 4. An extension valve 8 consisting of a plurality of disk valves for opening and closing the extension oil passage 6 is installed on the lower surface, and a seat valve 10 is installed on the back of the compression valve 7 via a valve collar 9. .

A bush vibrator 12 is inserted into the hollow rod 2 via a spacer 11, and an adjustment piece 13 that slides on the inner circumferential surface of the hollow rod 2 is screwed onto the outer peripheral surface of the tip of the push pipe 12 so as to be able to move forward and backward. , a stopper piece 14 is fitted around the outer periphery of the tip of the adjustment piece 13,
An adjustment lever 15 is inserted into the stopper piece 14, and both ends of the adjustment lever 15 are brought out through a long hole 16 formed in the rod end 3. 17
A needle roller 18.18, whose one end a is swingably supported and attached to the other end of the link stays 17a, l7a of the stabilizer holder 17, is inserted between the compression side valve 7 and the seat valve 10. The damping force can be adjusted by changing the bending fulcrum of the compression side valve 7 by intervening so as to be movable in the radial direction, and a compression side adjustment dial 19 is fixed to the rear end of the bush vibe 12. By making the thickness of the valve collar 9 equal to or slightly thicker than the diameter of the needle roller 18, the needle roller 18 can move smoothly.

A bushing rod 21 is screwed into the bushing vibrator 12 so as to be freely advanced and retractable, and the tip of the bushing rod 21 passes through the stopper piece 14, and a needle 22 formed at the tip is slidably inserted into the rod end 3. It is facing the bulb color 23. The collar 2 is secured to the back of this valve collar 23 and inside the rod end 3 with a nut 24.
A spring 26 is interposed between the spring 26 and the distal end surface of the needle 22 to urge the valve collar 23 upward, and the valve collar 23 fits into the needle 22 and closes the orifice except during the extension stroke.
During the extension stroke, a valve collar 23 is layered from the needle 22 to form an orifice, and an extension adjustment dial 27 is fixed to the rear end of the bushing rod 21.

Then, an upper bracket 28 is screwed onto the rear end of the hollow rod 2, and a spring 29 is inserted into a hole formed in the axial direction in the compression side adjustment dial 19.
Balls 30 and 31 are arranged above and below 9, and the ball 30 faces into the recess 32 formed in the extension side adjustment dial 27, and the hole 31 faces into the recess 33 formed in the upper bracket 28. By forming the recess 33 slightly larger than the recess 32, the click resistance of the compression side adjustment dial 27 is increased so that the compression side adjustment dial 19 does not rotate even when the expansion side adjustment dial 27 is rotated.
In addition, the compression side adjustment dial 19 and the expansion side adjustment dial 27
By setting the ball 30 for use and providing the bushing rod 21 in the bushing vibrator 12 so that it can move forward and backward,
By preventing the expansion side adjustment dial 27 from rotating when the compression side adjustment dial 19 rotates and affecting the expansion side, the compression side adjustment dial 19 and the expansion side adjustment dial 27 can be placed in one place so that they do not affect each other. There is a mechanism interposed that does not affect the

A rod guide 35 is fitted into the inner circumferential surface of the upper end of the cylinder 1 so as to be in sliding contact with the outer circumferential surface of the hollow rod 2.
An oil seal 36 that slides on the outer circumferential surface of the hollow rod 2 is fitted on the lower inner circumferential surface of the hollow rod 2 and fixed with a stopper collar 37, and a rebound rubber 38 is fitted on the lower side of the stopper collar 37. There is.

Further, an adjustment ring 40 is screwed onto the lower outer peripheral surface of the cylinder 1 so as to be movable up and down, and a spring seat 41 is placed on the upper surface of this adjustment ring 40. Insert the retainer 42 into the bracket 28,
A spring seat 43 is attached to the lower surface of this retainer 42, and a suspension spring 45 is interposed between the spring seat 41 and the spring seat 43 on the left side with a dust cover 44 interposed therebetween. A stop rubber 46 is attached to the rear end of the rod 2.

Furthermore, a lower bracket 49 is integrally formed at the lower end of the cylinder 1, and a sub-tank unit 51 is attached to the lower end side of the cylinder 1, which communicates with the cylinder oil chamber S2 through an oil passage 50. A compression-side damping force adjustment mechanism 53 is disposed in the flow path between the sub-tank 52 and the cylinder l, and the sub-tank 52 is closed with a cap 54 and a bladder 55 is disposed therein.

The compression side damping force adjustment mechanism 53 includes a fixed rod 57 disposed inside the case 56.
A piston 58 that is in contact with the inner peripheral surface is installed, and this piston 5
8 is provided with a seat valve 63 consisting of a plurality of disc valves that form oil passages 61 and 62 and open and close the oil passage 61,
Similar to the compression side damping force adjustment mechanism provided on the piston 4 described above, by rotating the dial 65, a rod (not shown) moves back and forth to adjust the needle roller 6 of the stabilizer holder 67.
8 moves in the radial direction so that the bending fulcrum of the seat valve 83 changes.

The operation of the damping force adjustment mechanism of the hydraulic shock absorber configured as above will be explained below.

First, as the hollow rod 2 moves downward together with the piston 4 during the compression stroke, the hydraulic oil in the lower oil chamber S2 passes through the compression side oil passage 5 of the piston 4, opens the compression side valve 7, and flows into the upper oil chamber S1. It flows into the inside and generates a damping force. Further, hydraulic oil equivalent to the entering volume of the hollow rod 2 flows from the oil passage 50 into the sub tank 22 51 and opens the seat valve 63 through the oil passage 61 of the piston 58 of the compression side damping force adjustment mechanism 53. , and flows into the sub-tank 52 through the oil passage 62 to generate damping force.

Further, as the hollow rod 2 moves upward together with the piston 4 during the extension stroke, the hydraulic oil in the upper oil chamber S1 passes through the extension side oil passage 6 of the piston 4 and opens the extension side valve 8, thereby opening the lower oil chamber S2. The hydraulic oil in the upper oil chamber S1 passes through the long hole 1θ of the rod end 3, the orifice between the needle 22 and the valve collar 23, bypasses the piston 4, and flows into the lower oil chamber. It flows into S2. Furthermore, the hydraulic oil equivalent to the withdrawal volume of the hollow rod 2 flows out from the sub-tank 51 of the sub-tank unit 51 and flows from the oil passage 50 to the oil chamber in the cylinder 1 through the oil passage 62 of the piston 58 of the compression-side damping force adjustment mechanism 53. Return to S2.

Here, when the compression side dial 19 is rotated, the bush pipe 12 rotates and moves the adjustment piece 13 up and down, and the stopper piece 14 moves up and down.
As the adjustment lever 15 moves up and down along the long hole lθ formed in the rod end 3, the link stays 17a and 17 of the two stabilizer holders 17.
a swings and the needle roller 18.18 moves in the radial direction, and the bending fulcrum of the compression side valve 7 changes depending on the position of the needle roller 18.18, so the damping force on the compression side changes.

When the extension dial 27 is rotated, the bushing rod 21 rotates relative to the bushing collar 12 and moves up and down, and the needle 22 moves forward and backward relative to the valve collar 23, so there is a space between the needle 22 and the valve collar 23. Since the opening amount of the orifice that is formed changes and the flow rate of the hydraulic oil that bypasses the piston 4 changes, the damping force on the compression side changes.

By the way, in this case, when the compression side adjustment dial 19 is rotated to adjust the compression side damping force, the extension side adjustment dial 27 is also rotated via the ball 30, and the bushing rod 21 is rotated in the same way as the plush pipe 12. The bushing rod 21 does not advance and the needle 22 does not move forward or backward relative to the valve collar 23, so that the damping force on the extension side is not affected.

Also, rotate the extension side adjustment dial 27 1. When adjusting the rebound damping force, the compression side adjustment dial 19 is rotated because the click resistance between the compression side adjustment dial 19 and the upper bracket 28 is greater than the click resistance between the compression side adjustment dial 19 and the rebound side dial 27. Therefore, it does not affect the compression damping force.

In the above embodiment, two adjustment dials are coaxially arranged.
Although an example has been described in which three or more are provided, it is also possible to provide three or more.

(Effects of the Invention) As explained above, according to the present invention, since the compression side adjustment dial and the expansion side dial are disposed in one place with a mechanism that does not affect the other, the compression Side damping force and rebound side damping force can be adjusted individually,
It is also easy to operate.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a hydraulic shock absorber equipped with a damping force adjustment mechanism according to the present invention, FIG. 2 is an enlarged view of the main parts of the shock absorber, and FIG. 3 is an enlarged cross-sectional view of the main parts of the shock absorber. . In addition, in the drawing, 1 is a cylinder, 2 is a hollow rod, 3 is a rod end, 4 is a piston, 5 is a compression side oil passage, 6 is an extension side oil passage, 7 is a compression side valve, 8 is an extension side valve, 12 is a bush pipe, 13 is an adjustment piece, 14 is a stopper piece, 15 is an adjustment lever, 17 is a stabilizer holder, 17a is a link stay, 18 is a needle roller,
19 is a compression side dial, 21 is a bushing rod, 22 is a needle, 23 is a valve collar, 27 is an extension side dial, and 51 is a sub-tank unit. Patent applicant: Showa Seisakusho Co., Ltd.
Person Patent Attorney Part 2 1) Part 1 Patent Attorney Kuni Ohashi Part 1 Patent Attorney Yu Koyama

Claims (1)

[Claims] In the damping force adjustment mechanism of a hydraulic shock absorber that adjusts the compression side damping force and the rebound side damping force, a compression side adjustment dial and a rebound side dial are arranged in one place, and a A damping force adjustment mechanism for a hydraulic shock absorber, characterized in that the damping force is adjusted by interposing a mechanism that does not affect the other.