JPS6181882A - Rear wheel suspension system for motor bi- and tri-cycle - 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 Industrial Application) The present invention relates to a rear wheel suspension system for motorcycles and tricycles.

(Prior art) A coaxial rear fork that uses the same coordinates as the output shaft and the fork fulcrum of the engine of a motorcycle or tricycle is a system that prevents the rear wheel drive chain from slacking, and because of the sunk position of the rear fork, the chain tension is This has the advantage that the strength of the amount of subsidence does not change.

(Problems to be Solved by the Invention) By the way, practical examples of this type of coaxial rear fork are shown in Fig. 5 and Fig. tS6. A chain (08) is wound around a counter shaft (09) arranged in parallel, and a sprocket (O8) is connected to the counter shaft (09).
Coaxially with the rear fork (01) pivot ((12)
, (02), but this has the disadvantage that the width of the vehicle frame increases. Further, in FIG. 6, a final shaft (0100) is further arranged behind the counter shaft (090) of the engine (04G).

Coaxially with this, the rear fork (010) pivot (0
20) and (020) are provided, but although this prevents the vehicle body width from increasing, it has the disadvantage that the length of the engine (040) is extended by one axis.

In addition, an 11-row link type model as shown in Figures 7 and 8 has been proposed as a rear wheel suspension system for motorcycles and tricycles.
However, both of them cause problems such as increased weight and stiffness of the legs. In addition, (0'4'), (040
” ) is the engine, (06°), (07'), (060
'), (070') are sprockets, ・(08'), (
080') is chain 8・n, (02'), (02
0') is a parallel link.

The present invention was made to solve the problem described in J. The purpose is to provide a rear wheel suspension system for two-wheeled and three-wheeled vehicles that can exhibit the same functions and effects as a coaxial rear fork. It is in.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for adjusting the mounting position of the front end of the rear fork to the rear fork/yaft rear frame with respect to its axis. In addition to making the rear fork shaft eccentric, a link machine η was also interposed between the two rear fork shafts and the rear fork shaft to rotate the rear fork shaft in conjunction with the tilting of the rear fork.

(Function) Therefore, when the rear fork shaft is rotated by the link mechanism due to the tilting of the rear fork, the end shaft support of the rear fork moves with respect to the vehicle body frame, and the engine The distance between the tin rockets fixed to the output end and the rear axle changes, and these outfits are kenotllll'! '- The slack in the chain that has been rolled up in Volume I is eliminated.

(Actual M1 example) Examples of the present invention will be described below based on the attached crystal planes.

:jr, 1 is a perspective view of the rear wheel suspension system according to the present invention, 4
FIG. 2 is an explanatory diagram of the operation of the rear wheel suspension system.

In Figure 1, (1) is a rear fork, the front end of which is pivotally connected via a fork shaft (2) to a vehicle body frame (not shown) so as to be vertically slidable. A rear wheel (not shown) is pivotally supported at the rear end of the rear fork (1) by a rear wheel (3). In addition, there is a small diameter sprocket (6) on the output shaft (5) of the engine (4).
However, large diameter sprockets (7) are each fixed to the rear axle (3), and a chain (8) is wound between these sprockets (e) and (7).

By the way, the rear fork shaft (2) described in +iii consists of large-diameter rear fork rotation shafts (2a), (2a) that support the front end of the rear fork (1), and the shaft of the rear fork rotation/movement shaft (2a). The rear fork shaft (2) is integrally formed with a small-diameter eccentric shaft (2b) whose axis (P2) is eccentric by ε with respect to the center (Pl), and the rear fork shaft (2) is connected to the E eccentric shaft (2b ) is rotatably attached to the vehicle body frame.

In addition, the above rear fork shaft (2) handler fork (
1) Between the slider fork (1) the slider fork rotation shaft (
A link mechanism (10) is provided that rotates the rear fork shaft (2) in conjunction with the tilting movement about 2a). This link mechanism (lO) has a rocker arm (11) that is swingably attached to the vehicle body frame, and its lower ends are connected to both ends of the rocker arm (11) and the rear fork shaft (2), respectively. Eccentric shaft (2b)
It is composed of links (+2) and (13) connected to the center.

Furthermore, as shown in Fig. 2, the do end of the link (13) is connected to the eccentric shaft (
The bladder of 2b) is connected to the bladder z) (2c) at a distance a distance from the axis (P2), and when the rear fork (1) is in the horizontal position, the axis (PI) , (P
2) and bracket) (2c) is tin locate ([
1), (7), and the straight line connecting the centers (0+) and (02), and the axis (Pl) is located in front of the axis (ρ9).

Therefore, if the rear fork (1) tilts up and down around the axis (Pl), the center of the sprocket (7) ((h) is a circle with radius R2 centered on the axis (P)). Trajectory(
C2), so the rear fork (1) moves as shown in Figure 1.
) moves upward only toward the hill and into the corner, the center (02) of the sprocket (7) is located at the point (0) on the circular locus (C2), and therefore the distance between the sprockets (6) and (7) The distance is a half-11h (= constant) circular locus (C
2) is shortened by ΔR, and the chain (8) ends up slacking by this amount ΔR.

However, in the case of the Kinomi style, if the rear fork (1) moves upward #i, the link m structure (+ (+) link CI2)
is pushed in one direction (in the direction of arrow (a)) and moves the column 7-m (work 1) counterclockwise (in the direction of arrow (b)), thereby pushing down the link (13) (
As a result, the rear fork shaft (
2) is rotated clockwise (direction of arrow (d)) about the axis (P2) of the eccentric shaft (2b), and the axis (Pl) of the rear fork rotation axis (2a) is rotated. while moving backwards, so the rear fork (1), ? & The small wheel sprocket (7) also moves rearward by the same amount, and the slack ΔR of the chain (8) is compensated for.

In addition, even if the rear fork (1) tilts downward, the rear fork (1), rear wheel, and sprocket (7)
) moves rearward, and the problem of slack in the chain (8) is solved.

3 and 4 show modified embodiments of the present invention, both of which have a rear fork shirt (102).

The configuration of (202) is the same as the first embodiment described in iin, but the configurations of link mechanisms (110) and (21G) are different.

! 0chi.

: The link mechanism (+10) shown in the iS3 diagram is the damper (
+20) by connecting the lower ends of the rocker arm (Il
l) is pivoted below the rear fork (+01), and the mouth,
Connect the car arm (Ill) to the conrod (+12) and /
Rear fork shaft (+02) via (+13)
It is connected to. In addition, the link mechanism shown in Fig. 4 (
The rocker arm (210) has its upper end connected to one end of the damper (220), and the lower end of the rocker arm (211) is attached to the upper surface of the rear fork (20+). The middle part of the rocker arm C212
) and the rear fork shaft (202) via the rear fork shaft (213). Ru.

Therefore, the same effects as in the first embodiment can be obtained in these modified embodiments.

(Effects of the Invention) As is clear from the above description, according to the present invention, the mounting position of the rear fork shaft, which pivotally connects the front end of the rear fork to the vehicle body frame, is eccentric to the axis of the rear fork shaft. At the same time, since a link mechanism is provided between the rear fork shaft and the fork to rotate the rear fork shaft in conjunction with the tilting of the rear fork, the rear fork moves rearward due to the tilting of the rear fork, thereby reducing the slack in the chain. This is resolved, and the same function as the 1i71-axis rear f-rear is obtained.

[Brief explanation of drawings]

No. 111 is a perspective view of the rear wheel suspension system according to the present invention, and FIG. 2 is a working theory [J] diagram of the same rear wheel suspension system, and FIG.
4 is a side view of a rear wheel suspension system according to a modified embodiment of the present invention, FIGS. 5 and 6 are top views of a coaxial rear fork, and FIG.
8 and 8 are cross-sectional views of a rear wheel suspension system that includes parallel links. In addition, in the drawing, '(+'), (lot), (20+) are rear fork, (2"l', (+02), (202
) Hariyaforkunyaft. (2a) The beamer fork rotating shaft, (2b) the eccentric shaft,
(6). (7) is a sprocket, (8) is a chain, (10).

Claims (1)

[Claims] The front end of the rear fork is pivoted to the body frame of a motorcycle or tricycle via a rear fork shaft so that it can swing up and down.
In the rear wheel suspension system for a motorcycle or tricycle in which the rear wheel is pivotally supported on the rear end of the rear fork, the attachment position of the rear fork shaft to the vehicle body frame is eccentric to the axis of the rear fork shaft, and A rear wheel suspension system for two or three-wheeled vehicles, characterized in that a link mechanism is interposed between the rear fork shaft and the rear fork to rotate the rear fork shaft in conjunction with the tilting of the rear fork.