JPS60146773A - Suspension system for rear wheel of motorcycle - 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 invention] The present invention relates to a rear wheel suspension system for a motorcycle.

A technique for interlocking a throttle grip of a motorcycle and a hydraulic shock absorber of a rear wheel suspension system has been existing for a long time (Utility Model No. 57-156650).

Shika 16. . Departure 5. Yo, ka;6□jutsu,). It's a goal, it's something done to achieve a goal.

[Object and structure of the invention]

The purpose and structure of this invention will be described below.

As shown in FIG. 1, turning □ of the motorcycle M is performed in an inclined state, which is more unstable than traveling straight. .

On the other hand, when driving around a corner, the vehicle usually accelerates in the middle of the turn, which is referred to as slow-infant push-out. At this time, as shown in the figure, since the centrifugal force F increases, the component force T' of the centrifugal force acting on the ground force of the wheel W increases.

This component force T is mechanically damped by the hydraulic shock absorber of the rear wheel suspension system.The inventor focused on using this component force T to stabilize the vehicle body during cornering.

Then, by increasing the compression damping force of the hydraulic shock absorber as the acceleration increases, the force component T to be buffered by the shock absorber is minimized, that is, the force component T transmitted to the vertical surface R is increased as much as possible. This improves the ground contact force of the rear wheels W.

[Explanation of Examples]

Embodiments of the present invention will be described below based on FIGS. 2 to 7.

In FIG. 2, 11 is a frame of the motorcycle, 13 is a rear arm, and 15 is a link mechanism for the rear arm 13. The rear arm 13 is connected to the rear wheel 1 via the axle 17 at its rear end.
9, whose front end is pivoted to the reframe 11 by a vibon shaft 21. Reference numeral 23 denotes a hydraulic shock absorber, which is connected between the link structure 15 of the rear arm 13 and the frame 11 to constitute a rear wheel suspension system. Reference numeral 81 denotes a throttle grip, which is connected to a damping force adjustment device 23 of a hydraulic shock absorber 23, which will be described later, through a flexible tube 91.

In FIG. 3, the hydraulic shock absorber 23 consists of a buffer spring 23a and a hydraulic damper 23b.

The hydraulic damper 23b includes a cylinder 29 filled with hydraulic oil, a piston 31 that slides inside the cylinder 29, and a piston rod 33 that holds the piston 31 at one end and projects outside the cylinder 29 at the other end. Equipped with piston 3
1 is provided with an orifice (not shown) through which hydraulic oil flows during the compression and expansion strokes of the hydraulic shock absorber 23 to generate damping forces, respectively.

35 is a reserve tank, which is communicated with the cylinder 29 via a rubber hose 37. This reserve tank 3
Hydraulic oil moves reciprocatingly between 5 and cylinder 29 (hereinafter referred to as "
The change in the volume of the piston rod 33 inside the cylinder 29 that occurs when the piston 31 moves back and forth into the cylinder 29 is adjusted by adjusting the flow. Note that this reserve tank 35 is equipped with a compression damping force adjustment device 39.
It is equipped with

Next, in FIG. 4, reference numeral 41 denotes a housing, which is integrally formed with the lid 35a of the reserve tank 35. As shown in FIG. This housing 41 constitutes a damping force adjustment device. 43 and 45 are through holes formed in the housing 45. The through hole 43 is for communicating with the cylinder 29, and the through hole 45 is for communicating with the reserve tank 35. 47 is a base valve, which is fixed within the housing 41. This base valve 47 is located between the through hole 43 and the through hole 45, and is used to adjust the flow rate of the adjusted flow of hydraulic oil. 49 is a through hole;
It is bored in the axial direction of the base valve 47. In this through hole 49, the oil flows toward the oil tank 35. 5
1 is a four-way valve that adjusts this flow rate. In addition, 5.3 is an orifice formed in the Haas valve 47, through which the hydraulic oil flows when flowing toward the cylinder 29.Next, 55 is a support member, which is connected to the i1 housing 41.
It is fitted inside. This support member 5sii has a through hole 57 into which an adjustment rotor lower to be described later is loosely fitted.

Reference numeral 59 denotes a spring receiving member, which is fitted into the support member 55 so as to be movable forward and backward, and its tip protrudes into the through hole 57.

A compression spring 61 is supported by a spring receiving member 59 to urge the plate valve 51 of the base valve 47, and d3 is an operating cylinder having an annular portion 63a at its tip, which is supported by a support member. It is fixed to the housing 41 by fitting into the housing 55. Further, 65 is an operating piston, which is slidably fitted into the cylinder 41. This piston 65 has an adjusting rod 67 which acts as a piston rod.
The adjustment rod 67 moves back and forth through the through hole 57 of the support member 55. Note that this adjustment rod 67 has a small diameter portion 67a at its tip. Further, 69 is a compression spring for returning the piston 65, which has been advanced by hydraulic pressure, to its original state.

Next, 71 is a damping force initial adjustment device, and the support member 5
5, a knob 75 for rotating this screw 73, and a click mechanism 77 for intermittently rotating the screw 73. Ru. The operating screw 73 and the spring receiving member 59 are coaxial, and an adjustment roller lower is sandwiched between the distal end of the operating screw 73 and the distal end of the spring receiving member 59. Therefore, the biasing force of the compression spring 49 can be adjusted by rotating the knob 75 and moving the operating screw 73 forward or backward.

Next, in FIGS. 5 and 6, 79 is a handle, 8
Reference numeral 1 designates a throttle grip rotatably fitted into the handle 79, reference numeral 83 a rotating member that rotates integrally with the throttle grip 81, and reference numeral 85 a housing that covers the rotating member 83. Further, 87 is a Bowden wire, and the rotating member 83
is connected to. This Bowden wire 87 is slot 7)
It opens and closes a valve (not shown). 89
is an operating cylinder, which is fastened to the housing 85. This cylinder 89 and the damping force adjustment device 3
It communicates with the operating cylinder 63 of No. 9 via a flexible tube 91.

This operation cylinder 89 will be explained based on FIG.

Reference numeral 93 denotes an operating piston, which is slidably fitted into the cylinder 89. Further, reference numeral 95 is an operating rod that operates as a piston rod, and its tip protrudes into the interior of the housing 85. This operating rod 95 is pressed by the rotating member 83 of the throttle grip 81 described above.

Next, 97 is a through hole formed in the piston 93. Hydraulic oil flows through this through hole 97 . 99 is a plate valve having a pore 101, and in this through hole 97,
It is installed on the opposite side of the operating rod 95 by being biased by a compression spring 103. Also, 105 is the piston 9
This is a return spring for returning 3 to its original state. Note that the spring force of this return spring 105 is greater than the spring force of the spring 103 of the plate valve 99.

Next, the operation of this embodiment will be explained.

When the throttle grip 81 is rotated, the rotating member 83 rotates to open the throttle valve and accelerate the throttle valve, while pressing the operating rod 95 of the operating cylinder 89. Then, since the operating piston 93 is pushed down, the hydraulic oil in the operating cylinder 89 passes through the flexible tube 91 and flows into the operating cylinder 63. In the working cylinder 63 into which the hydraulic oil has entered, the working piston 65 is pushed forward, so the adjusting rod 67 moves forward, and the large diameter portion 67b of the adjusting rod 67 is held between the spring receiving member 59 and the operating screw 73. In order to
The spring receiving member 59 is pressed toward the spring 65, and as a result,
The spring force of this spring 65 is strengthened. For this reason, the plate valve 51 of the base valve 47 opens (as a result, the damping force of the compression stroke of the hydraulic shock absorber 23 increases. Note that a small hole 101 is formed in the plate valve 99 of the operating piston 93. Therefore, even while the grip 81 is being operated, the hydraulic oil leaks little by little, so the damping force returns to its original state after a certain period of time.

〔Effect of the invention〕

A rear wheel suspension system for a motorcycle according to the present invention is a rear wheel suspension system for a motorcycle using a hydraulic relaxation iMj device.
Since the compressive damping force of the hydraulic shock absorber is configured to increase in conjunction with the throttle grip of the motorcycle, it is possible to stabilize the vehicle body during cornering by utilizing the centrifugal force generated during cornering. can.

[Brief explanation of the drawing]

Figure 1 is a diagram of the turning state of a motorcycle, Figures 2 to 7
The figures show an embodiment of the present invention, in which Fig. 2 is a side view of a motorcycle, Fig. 3 is an enlarged view of the hydraulic shock absorber shown in Fig. 2, and Fig. 4 is an enlarged sectional view of the section ■ in Fig. 3. , FIG. 5 is a longitudinal sectional view of the throttle grip, and FIG. 6 is a Vl-Vl in FIG. 5.
A line cross-sectional view, FIG. 7 is an enlarged cross-sectional view of the ■ part in FIG. 23...Hydraulic relaxer fffi device 81...Engraving of the throttle grip drawing (no changes in content) Whistle 1 Figure 2 Figure 1 Procedural amendment document ■ April 3, 1980 Mr. Kazuo Wakasugi, Commissioner of the Patent Office 2, Name of the invention: Rear wheel suspension system for motorcycles 3, relationship with the amended case Patent Applicant address: 2500 Shingai, Iwata City, Shizuoka Prefecture Name (AO7) Yamaha Motor Co., Ltd.
Hideto 4, Agent 14 Motoshiro-cho 115, Hamamatsu City, Shizuoka Prefecture 430 (Koishi Building) March 27, 1980 (Date of dispatch) Procedural Amendments) August 27, 1980 Director General of the Demand Agency Shiga Gakuden 2, Name of the invention Rear wheel suspension system for a motorcycle 3, Relationship with the corrector's handle Patent applicant address 2500 Shingai, Iwata City, Shizuoka Prefecture Name (AO7) Yamaha Motor Co., Ltd. Lee Kikichi Spout
Hideto 4, Agent 14 (Koishi Building), 115 Motoshiro-cho, Hamamatsu City, Shizuoka Prefecture, 430 Prefecture Detailed explanation of the invention in the specification, Column 6, Contents of amendment Tl+ On page 4, line 13 of the specification, `` Housing 45”
(2) On page 6, line 14, the phrase "compression spring 49" is corrected to read "compression spring 61." (3) On page 8, lines 14-15, [Spring 65...
The phrase "spring force of .

Claims (1)

[Claims] +l) In a rear wheel suspension system for a motorcycle using an oil impeller, the rear wheel suspension for a tricycle is configured to increase the pressure damping force of the hydraulic pressure device in conjunction with the throttle grip of the motorcycle. Device.