JPS61184115A - Damping force controlling for shock absorber of vehicle - Google Patents

Abstract

PURPOSE:To improve the comfortability of motor-cycle by constructing such that upon rolling wheel supporting arm, the damping forces of extensional and contractional damping force producing units in shock absorber are regulated through a regulating member which will rotary displace accordingly. CONSTITUTION:Upon application of upward load from the pavement onto the rear wheel to roll a rear fork 3 upward around a pivot shaft 4 against a suspension spring 18 under running of motor-cycle, a shock-absorber 8 will contract to produce the damping force through contractional damping force producing unit 20. Since a lever 29 is rotated relatively downward through a link 31 at this time, a contractional damping force regulating member 22 will rotate counter-clockwise to increase the damping force to be produced through said unit 20 as the upward rolling of rear fork 3 will increase. While upon removal of said upward load to roll the rear fork 3 downward, an extensional damping force regulating member 21 is rotated through a lever 24 thus to produce the damping force through an extensional damping force regulating member 19.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Field of Application The present invention relates to a vehicle that is connected between a vehicle body and a wheel support arm that is pivotally supported on the vehicle body to be vertically swingable and supports wheels. The present invention relates to a damping force control device for a vehicle shock absorber in which an extensional damping force generation device and a contraction damping force generation device are installed.

(2) Prior Art Conventionally, hydraulic shock absorbers equipped with a variable damping force generating device that can freely adjust the generated damping force have already been disclosed, for example, in Japanese Utility Model Publication No. 5 &-32971. Are known.

(3) Problems to be Solved by the Invention In recent years, there has been a growing demand for improved ride comfort in vehicles, and further improvements in wheel suspension systems have been desired.

Therefore, the present invention adjusts the damping force generated by the extensional damping force generator and the contraction damping force generator in the shock absorber according to the rocking position of the wheel support arm, thereby contributing to improving the riding comfort of the vehicle. It is an object of the present invention to provide a damping force control device for a vehicle shock absorber.

B0 Structure of the Invention (υ Means for Solving Problems According to the present invention, there is provided an extensional damping force adjusting member capable of adjusting the damping force generated by the extensional damping force generating device by rotational displacement, and a contraction damping force generating device. A contraction damping force adjustment member capable of adjusting the damping force by rotational displacement is provided in the shock absorber, and both of the adjustment members and a displacement member that is vertically displaced according to the wheel support arm or the vertical swing of the wheel support arm. In response to the downward swing of the wheel support arm, the extension damping force adjustment member is rotationally displaced in a direction that causes the extension damping force generator to generate a damping force, and in response to the upward swing of the wheel support arm, the extension damping force adjustment member is contracted. The contraction damping force adjusting member is connected to rotate the contraction damping force adjusting member in a direction that causes the damping force generating device to generate a damping force.

(2) Operation When the wheel support arm swings, the extension damping force adjustment member and the contraction damping force adjustment member are rotated and displaced accordingly, and the extension damping force generation device and the contraction damping force generation device are activated when the wheel support arm swings. Generates a damping force corresponding to the moving position.

(3) Examples Examples of the present invention will be explained below with reference to the drawings.
First, in FIG. 1 showing an embodiment of the present invention, at the rear of a vehicle body 2 of a motorcycle 1, the front end of a rider fork 3 serving as a wheel support arm is pivoted to be vertically swingable by a pivot shaft 4.
A wheel driven by an engine 5 via a chain transmission 6, that is, a rear wheel 7, is pivotally supported at the rear end of the rear fork 3.

In FIG. 2, a shock absorber 8 is interposed between the vehicle body 2 and the rear fork 3. This shock absorber 8 consists of a cylinder 9 filled with buffer oil and a piston 1 slidably fitted inside the cylinder 9.
0. An upper mounting member 12 is fixed to the upper end of a piston rod 11 that slidably passes through the upper end wall of the cylinder 9 and is connected to a piston 10. The upper mounting member 12 is connected to the vehicle body 2 via a pivot 13. Connected so that they can swing back and forth. Further, a lower mounting member 14 fixed to the lower end of the cylinder 9 is attached to a connecting shaft 1 parallel to the pivot shaft 13 on the swing plate 15.
6. Further, the swing plate 15 is connected to the rear fork 3 via a connecting shaft 1T parallel to the connecting shaft 16.

A coiled suspension spring 18 that surrounds the cylinder 9 and the piston rod 11 is compressed between the upper mounting member 12 and the lower end of the cylinder 9, and the shock absorber 8 is expanded by the spring force of the suspension spring 18. biased in the direction.

The piston 10 in the cylinder 9 includes a known extensional damping force generator 19 that applies damping force to the expansion operation of the shock absorber 8, and a known contraction damping force generation device 20 that applies damping force to the contraction operation of the shock absorber 8. is provided, and an extensional damping force generating device 1
An extension damping force adjustment member 21 whose generated damping force can be adjusted by rotational displacement is interlocked with 9, and a contraction damping force adjustment member 21 whose generated damping force can be adjusted by rotational displacement is connected to the contraction damping force generating device 20. Members 22 are interlocked.

The extensional damping force adjusting member 21 is rotatably supported by the upper mounting member 12, and can increase the damping force generated by the extensional damping force generating device 190 as it rotates clockwise in FIG. Furthermore, the contraction damping force adjusting member 22 is connected to the lower mounting member 1.
4, and as it rotates counterclockwise in FIG. 2, the damping force generated by the contraction damping force generating device 20 can be increased.

The extension damping force adjusting member 21 is configured by an interlocking device 23 so as to rotate clockwise as the rear fork 3 swings downward.
It is connected to the rear fork 3 via. This interlocking device 2
3 includes a lever 24 fixed to the outer end of the extensional damping force adjusting member 21, and one end connected to the lever 24 via a connecting shaft 25 and the other end connected to the rear fork 3 via a connecting shaft 26. It consists of a link 27.

Further, the contraction damping force adjusting member 22 is connected to the rear fork 3 via the interlocking device 28 and the swing plate 15 so as to rotate counterclockwise as the rear fork 3 swings upward. This interlocking device 28 is connected to the contraction damping force adjusting member 22.
A lever 29 is fixed to the outer end of the lever 29, a link 31 whose one end is connected to the lever 29 through a connecting shaft 30, and the other end of the link 31 is connected to the intermediate portion through a connecting shaft 32. It consists of a tension rod 33. Tension rod 33
is arranged below the rear fork 3, its front end is connected to the vehicle body 2 via a pivot 34 so as to be vertically swingable, and its rear end is connected to the swing plate 15 via a connection shaft 35.

Next, to explain the operation of this embodiment, when the rear wheel 7 receives an upward load from the road surface while the vehicle is running,
The rear fork 3 resists the elastic force of the suspension spring 18 and
When the shock absorber 8 swings upward as shown in the figure, the shock absorber 8 performs a contraction operation, so that the contraction damping force generating device 20 generates a damping force. Moreover, as the rear fork 3 swings upward, the angle between the rear fork 3 and the axis of the shock absorber 8 changes, and accordingly, the lever 29 is rotated downward by the link 31, and the contraction damping force adjusting member 22 counterclockwise. Therefore, the damping force generated by the contraction damping force generating device 20 increases as the amount of upward rocking of the rear fork 3 increases. Therefore, the restriction on the upward swing speed of the rear fork 3 becomes stronger as the amount of swing increases, and the large swing energy of the rear fork 3 is effectively absorbed.

Therefore, when the upward load on the rear wheel T is removed and the rear fork 3 swings downward due to the elastic force of the suspension spring 18, as shown in FIG. 2, the lever 24 rotates downward. The extension damping force adjusting member 21 is rotated clockwise.

As a result, a damping force is generated by the extension damping force generating device 19, and the damping force increases as the amount of downward swinging of the strut fork 3 increases. Therefore, the restriction on the downward swinging speed of the rear fork 3 becomes stronger as the amount of swinging increases, and the rear fork 3 can be swung by a large amount without a large impact within the specified swinging stroke range of the rear fork 3. Energy is absorbed effectively.

FIG. 4 shows another embodiment of the present invention, in which the buffer 8'
is interposed between the vehicle body 2 and the rear fork 3 with the top and bottom reversed from the above-mentioned embodiment. That is, the shock absorber 8' is arranged with the piston rod 11 facing downward, and an upper mounting member 36 fixed to the upper end of the cylinder 9 is pivoted to the vehicle body 2 and fixed to the lower end of the piston rod 11. A lower mounting member 37 is pin-coupled to the rear fork 3. Further, a pair of coiled suspension springs 39a and 39h are interposed between the upper end of the cylinder 9 and the lower mounting member 37, with a ring-shaped displacement member 38 sandwiched therebetween. Both suspension springs 39α,
39b has the same specifications, and the displacement member 38 may be fixed to the center of a single coiled suspension spring.

A lever 40 is fixed to the outer end of the extension damping force adjusting member 21 rotatably supported by the upper mounting member 36, and a link 41 is connected to the lever 40 by a pin. Further, the contraction damping force adjusting member 2 is rotatably supported by the lower mounting member 37.
A lever 42 is fixed to the outer end of 2, and a link 43 is connected with a pin to this lever 42. On the other hand, the displacement member 3
8 is integrally provided with a connecting portion 44, and both the links 41, 43. is connected to the connecting portion 44 via a connecting shaft 45.

According to this configuration, when the rear fork 3 swings downward as shown in FIG. 4, the displacement member 38 is also displaced downward,
When the rear fork 3 swings upward as shown in FIG. 5, the displacement member 38 also moves upward. Each lever 40, 42 rotates in accordance with the vertical displacement of the displacement member 38, and when the rear fork 3 swings upward, the contraction damping force adjusting member 22 rotates clockwise to increase the contraction damping force. rear fork 3
When the extension damping force adjuster 21 swings downward, the extension damping force adjusting member 21 rotates counterclockwise to increase the extension damping force.

In this embodiment, not only can the same effects as the above-mentioned embodiments be achieved, but also the tension rod 33 and the rocking plate 15 in the above-mentioned embodiments can be omitted, thereby reducing the number of parts. can.

C0 Effects of the Invention As described above, according to the present invention, there is provided an extensional damping force adjusting member capable of adjusting the damping force generated by the extensional damping force generating device by rotational displacement, and an extensional damping force adjusting member capable of adjusting the generated damping force of the contraction damping force generating device by rotational displacement. An adjustable contraction damping force adjustment member is provided on the shock absorber, and both adjustment members and a displacement member that is vertically displaced in response to the wheel support arm or the vertical swing of the wheel support arm are arranged in the shock absorber. The extension damping force adjusting member is rotationally displaced in a direction that causes the extension damping force generator to generate damping force in response to the downward swing, and the contraction damping force generator produces damping in response to the upward swing of the wheel support arm. Since the contraction damping force adjusting member is connected to rotationally displace the contraction damping force adjusting member in the direction of generating force,
The damping force generated by both damping force generating devices can be automatically controlled in accordance with the swinging position of the wheel support arm. the result,
The shock absorber exhibits an effective shock absorbing function within the limited swing range of the wheel support arm, and can contribute to improving the ride comfort of the vehicle. Moreover, since each adjusting member is rotary, its operation is extremely smooth.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a side view of a motorcycle in which the device of the present invention is applied to a rear wheel suspension system, and FIG. 2 is a side view of the device of the present invention in an extended state.
FIG. 3 is a side view of the device of the invention in a contracted state, FIGS. 4 and 5 show other embodiments of the invention, and FIG. 4 is a side view of the device of the invention in an extended state. , FIG. 5 is a side view of the device of the present invention in a retracted state. 2...Vehicle body, 3...Rear fork as a wheel support arm, 7...Rear wheel, 8.8'...Buffer, 19...Extension damping force generator, 20...Contraction damping Force generator, 2
1... Extension damping force adjustment member, 22... Contraction damping force adjustment member Patent applicant Honda Motor Co., Ltd. Representative Patent Attorney Ochiai --7T7'1:
′; Suga ” -1 1111

Claims (1)

[Claims] A vehicle shock absorber that is interposed between a vehicle body and a wheel support arm that is pivotally supported by the vehicle body so as to be vertically swingable and supports a wheel, and that has a built-in extensional damping force generating device and a contraction damping force generating device. In the damping force control device for a damping device, an extension damping force adjustment member that can adjust the damping force generated by the extension damping force generator by rotational displacement, and a contraction member that can adjust the generated damping force of the contraction damping force generator by rotational displacement. A damping force adjustment member is provided on the shock absorber, and both of the adjustment members and the wheel support arm or a displacement member that is vertically displaced according to the vertical swing of the wheel support arm are configured to move the wheel support arm downward. Rotatably displaces the extensional damping force adjustment member in a direction that causes the extensional damping force generator to generate damping force in response to rocking, and generates damping force in the contraction damping force generator in response to upward rocking of the wheel support arm. 1. A damping force control device for a vehicle shock absorber, characterized in that the damping force control device for a vehicle shock absorber is connected to rotationally displace a contraction damping force adjusting member in a direction of increasing the contraction damping force.