JPS6088689A - Regulator for damping force of oil buffer for suspension in car with bar handle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a damping force adjustment device for a medicated hydraulic shock absorber in a vehicle with a bar bundle.

[Prior art]

It is desirable for this type of hydraulic shock absorber to adjust the damping force depending on the loaded weight of the vehicle, road surface conditions, and driving method in order to maintain a good load balance on the vehicle.

For this reason, in the past, a damping force adjustment means was installed in the suspension hydraulic shock absorber, and an operating member for operating this damping force adjustment means was provided on the steering handle, so that the driver could remain in the riding position. The damping force was easily adjusted using
No. 4-53437).

However, since the operation of this operating member is a stepless operation, it is difficult to accurately manually adjust the operating member while the vehicle is running.

On the other hand, since the magnitude of the impact force applied to the vehicle from the road surface varies depending on the individual impact, the adjustment of the damping force in the suspension hydraulic shock absorber is based on the average magnitude of the impact force applied to the vehicle in a certain driving condition. It can be said that it is related to the value.

Therefore, although a certain degree of accuracy is required in adjusting the damping force, it does not need to be more precise than that.

[Purpose of the invention]

The present invention was made based on this situation, and its object is to provide a suspension hydraulic shock absorber for a vehicle with bar handle adjustment, which can be easily manually adjusted while ensuring a necessary degree of accuracy while the vehicle is running. An object of the present invention is to provide a damping force adjustment device.

For this purpose, an adjustment operation member is installed on the steering bar handle on the other side of the throttle grip.
This was achieved by adjusting the damping force of the suspension hydraulic shock absorber by configuring the adjustment operation of the operating member to be stepped.

[Explanation of Examples]

Hereinafter, the present invention will be described in detail based on the drawings.

In FIG. 1, 11 is a frame of a motorcycle, 13 is an engine, and 15 is a carburetor. Further, 17 is a front fork installed at the tip of the 7-ray 411, and 19 is a rear arm pivotally supported at the rear end of the frame 11.

The front fork I7 holds the front wheel 21 at its lower end and supports the steering bar handle 23 at its upper end. Further, the rear arm 19 holds a rear wheel 27 via an axle 25 at its rear end. 29 is a hydraulic shock absorber, and a hook is passed between the upper end of the rear arm 19 and the frame 11;
It forms the rear wheel suspension system. Steering bar handle 23
A throttle grip 31 is installed on one side, and an operating member 33 is installed on the other side. This operating member 33 is connected to a damping force adjusting means 37 (described later) of the hydraulic shock absorber 29 via a Bowden wire 35, and operates the adjusting means 37.

In FIG. 2, the hydraulic shock absorber 29 consists of a loose 1h spring 29a and a hydraulic damper 29b.

The hydraulic damper 29b has a cylinder 39 filled with hydraulic oil. A piston 41 slides inside the cylinder 39 and divides the inside of the cylinder 39 into two oil chambers 43 and 45. A piston rod 47 holds the piston 41 at one end and projects out of the cylinder 39 at the other end. Reference numeral 49 denotes a communication hole, which is bored in the piston fitting portion of the piston rod 47. This communication hole 49 communicates the two oil chambers 43 and 45.

On the other hand, the piston rod 47 has a shaft hole 51. This shaft hole 5
An operating rod 55 having a needle valve 53 at its tip is fitted into I so as to be movable forward and backward. The needle valve 53 moves forward and backward toward the communication hole 49 to increase or decrease the opening surface of the communication hole 49, thereby forming a variable orifice. 57 is a member for installation,
It is screwed onto the other end of the piston rod 47. This mounting member 57 includes damping force adjustment means 37 for adjusting the variable orifice.

Next, this damping force adjusting means 37 will be explained based on FIG.

The mounting member 57 having the damping force FJN adjustment means 37 is
A base 61a into which the spring seat 59 is fitted, and this base 61a
The bracket 61b is screwed onto the bracket 61b.

63 is a through hole, which is installed in the member 57 by drilling perpendicularly to the piston rod 47 and through the shaft hole 51 of the piston rod 47.
It communicates with Reference numeral 65 denotes a rotating tool, which is rotatably fitted into the base 61a. The rotating tool 65 has an inward flange 65a at its tip. As shown in FIG. 4, a cam surface 8o is formed inside the inward flange 65a. This cam surface 8o has convex portions 80a, 80a and a concave portion 80.
b, 80b, convex portions 80a, 80a and concave portions 80b, 80
It is composed of tapered portions 80C and 80C formed between the The rotating tool 65 is rotated in the direction of the arrow (in FIG. 4) by being pulled by the Bowden wire 35, and returned to its original state by the elastic force of the return spring 67 by loosening the Bowden wire 31. return. Further, reference numeral 69 denotes a locking rod, which is loosely fitted into the through hole 63 and is secured to the protrusions 3Qa, 80a on the cam surface 80 of the rotating tool 65. The end of the operating rod 55 passing through the shaft hole 51 is brought into pressure contact with the approximate center of the locking rod 69 due to the atmospheric pressure of the gas chamber (not shown) of the cylinder 39, and as a result, the locking rod 69 becomes a rotary tool. It comes into pressure contact with the cam surface 80 of 65. Therefore, when the rotating tool 65 is rotated, the locking rod 69 slides on the cam surface 80, so that the operating rod 55 advances and retreats through the shaft hole 51 of the piston rod 47.
Adjust the opening area of the variable orifice. Reference numeral 71 denotes an adjustment tool, which is screwed onto the bracket 61b while in contact with the screw tool 65. This adjustment tool 71 screws through a click stop mechanism 73, and adjusts the ratio of the exposed portion of the operating rod 69 to the through hole 63 when the damping force adjustment means 37 is not activated, that is, the proportion of the exposed portion of the operating rod 69 to the through hole 49 between the needle valve 53 and the communication hole 49. Adjust the opening area of the orifice formed by. In addition, 75 is a support cylinder, which is screwed onto the base 61a, and is connected to the Bowden wire 35.
is supported.

In FIGS. 5 and 6, the operating member 33 has a disk-shaped fixing member 77 fitted to the steering bar bundle 23. As shown in FIGS. Reference numeral 79 denotes a circumferential groove, which is formed in the fixing member 77. This circumferential groove 79 guides the Bowden wire 35.

On the other hand, 81 is a rotating member having a cylindrical body 81a. The rotating portion JA81 is rotatably fitted into the steering bar handle 23 and is prevented from being removed by the fixing member 77. Reference numeral 83 denotes a locking pin, which is installed on the upper part of the rotating part JIA81. The inner wire of the Bowden wire 35 is connected to the rotating member 81 via this locking pin 83.

The rotating member 81 configured in this way is a fixed part) 477
It rotates intermittently by a click stop mechanism 85 installed between the two. This click stop mechanism 85 is
A locking body 87 provided on the fixed member 77 and resiliently repelled in the direction of the rotating portion IfA81, and holes 89 a , 89 b , 8 drilled in the rotating member 81 into which the locking body 87 fits.
9c. Here, when the locking ball 87 is fitted into the hole 89a, the damping force by the hydraulic damper 29b is small, and as it is fitted into the hole 89b and then the hole 89c, the applied damping force increases. Therefore, in the case of a motorcycle that runs on both paved roads and rough terrain, the locking body 87 may be aligned with the hole 89a when traveling on a paved road, and the locking body 87 may be aligned with the hole 89c when traveling on rough terrain.

Note that reference numeral 91 denotes a rubber gripping portion, which is fixed to the outer circumferential surface of the cylinder 81a that is inserted into the rotating member 81.

Next, the operation of this embodiment of the adjusting device will be explained based on FIGS. 2, 3, 4, 5, and 6.

In the state shown in FIG. 6, the operating member 33 is operated to rotate the rotating member 81 in the direction of the arrow. Then, the Bowden wire 35 is pulled. Therefore, the rotating tool 65 moves in the direction of the arrow (
(in FIG. 4), and as a result, the locking rod 69 engages the tapered portion 80c at the cam surface 80.

In order to pass through 80C and come into pressure contact with the recesses 80b, 80b,
The operating rod 55 moves back. Therefore, the opening area of the variable orifice increases, and as a result, the damping force generated by the hydraulic damper 29b gradually decreases.

Note that if the rotating part 81 is rotated in the opposite direction, the screw tool 65
is returned to its original state by the return spring 67, and the damping force generated by the hydraulic damper 29b is returned to its original state.

7 and 8 show other embodiments of the operating member 33. FIG.

In this embodiment, the operating lever 9 is
3 is pivotably supported. And this operation lever 93
By intermittently swinging the click stop mechanism 85, the traction of the Bowden wire 35 is adjusted.
Adjust the damping force of the hydraulic shock absorber 29.

〔Effect of the invention〕

A damping force adjustment device for a suspension hydraulic shock absorber in a vehicle with a bar handle according to the present invention includes an adjustment operation member installed on a side other than a throttle grip in a steering bar bundle, and adjusts the adjustment operation of this operation member. The damping force of the suspension hydraulic damper (i) is adjusted by adopting a configuration for stepped displacement.

Therefore, while the vehicle is running, the driver can easily manually adjust the damping force of the hydraulic shock absorber in response to changes in vehicle speed, road surface conditions, and loading conditions while ensuring the necessary degree of accuracy.

[Brief explanation of drawings]

The drawings show an embodiment of the adjusting device for a suspension hydraulic shock absorber in a vehicle according to the present invention, and FIG. 1 is a side view, FIG. 2 is an enlarged partial cross-sectional view of the ■ part in FIG. 1, and FIG. Figure 4 is an enlarged view of ■ section in Figure 2, and IV in Figure 3.
- An enlarged view showing the relationship between the locking rod and the cam surface when cut at IV, FIG. 5 is a sectional view of the operating member, and FIG.
In the figure, ■ arrow diagram, Figure 7 is a sectional view of other operating members,
FIG. 8 is a sectional view taken along the line ■--■ in FIG. 7. 23... Bar handle for steering 29... Hydraulic shock absorber for wheel suspension 31... Throat gripsop 33... Adjustment operating member 37... Damping force adjustment means Fig. 3, Fig. 4 Figure 5 Figure 6 r Figure 7 ■=

Claims (1)

[Claims] (1) In a vehicle having a throttle grip as an example of a bar handle, and in which a suspension hydraulic shock absorber of the vehicle is provided with a damping force adjustment means, an operating member for adjusting the suspension hydraulic shock absorber is attached to the bar bundle. A damping force adjustment device for a suspension hydraulic shock absorber in a vehicle with a bar bundle, which is provided on the other side and configured so that the adjustment operation of the adjustment operation member is stepped.