JPS61205584A - Rear-wheel suspension system for car - 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 vehicle wheel suspension system, and particularly to a rear wheel suspension system equipped with a swing arm.

"Conventional technology" Suspension systems conventionally used in vehicles, e.g.
2. Description of the Related Art As a rear wheel suspension system for a motorcycle, a structure including a swing arm as shown in FIGS. 1 and 2 is known.

The rear wheel suspension device is provided at the lower rear of the body frame 2 of the vehicle 1, is swingably supported by a bearing portion 3 provided on the body frame 2, and extends toward the rear of the vehicle 1. a swing arm 4, and a transmission member (for example, a chain) 7 that is rotatably attached to the swinging end of the swing arm 4 and is wound around a power train 6 of a prime mover 5 disposed in front of the swing arm 4. A cushion 9 consisting of a spring 9a and a shock absorber 9b is interposed between the upper surface of the swing arm 4 near the bearing portion 3 and the vehicle body frame 2. The winding transmission member 7 also connects a drive sprocket 10 integrally provided to the power train 6 and a driven gear 11 integrally provided to the rear wheel 8.
The bearing portion 3 is wound between the
As shown in FIG. 2, a support shaft 3a is installed between the vehicle body frames 2 on both sides of the prime mover 5, and a sail end portion of the swing arm 4 is rotatably attached to both ends of the support shaft 3a. The bearings 3b and 3C are integrally connected to each other, and are positioned rearward in the plane direction of the drive sprocket 10 and are arranged so as to overlap in the longitudinal direction of the vehicle 1.

"Problems to be Solved by the Invention" The present invention aims to solve the following problems in the conventional technology described above.

In other words, in the case of the rear suspension system having a weight of 2, the axis of the support shaft 3a, which is the center of swing of the swing arm 4, and the center of rotation of the drive sprocket 10, which is the center of swing of the winding transmission member 7, are , are provided at intervals in the longitudinal direction of the vehicle 1, so as the vertical movement of the rear wheel 8 increases, the distance between the swinging end of the swing arm 4 and the drive sprocket 1o changes. Due to the winding conduction member 7
The problem is that there is a risk that the tension applied to the material may change.

As an example of a structure for solving this problem, the support shaft 3a and the drive sprocket 10 are disposed coaxially, so that the center of swing of the swing arm 4 and the center of rotation of the drive sprocket 10 are aligned. is considered.

However, if such a means is to be implemented in the rear wheel suspension system described above, the power from the power train 6 must be transmitted to the drive sprocket 10 provided on the support shaft 3a. , it is necessary to newly provide an output section that connects the power train 6 and the support shaft 3a, and as a result, the rear part of the prime mover 5 and the support shaft 3a have to be moved rearward. Such a problem arises because the wheelbase of the vehicle I is set in advance, so the distance between the rear end of the prime mover 5 and the rear wheels 8 is narrowed, and the vehicle is installed within this distance. This may lead to problems such as restricting the installation position of the cushion 9, and countermeasures are desired.

"Means for Solving the Problems" The present invention aims to provide a rear wheel suspension system for a vehicle that can effectively solve the conventional problems described above. The bearing part that supports the arm includes a support shaft that passes through the rear end of the prime mover in the width direction of the vehicle, and bearings that are fitted to both ends of the support shaft and to which the swing arm is integrally connected, A drive sprocket that outputs driving force to a rear wheel attached to the swing arm is rotatably attached to one end of the support shaft and connected to an output part of a power train provided in the prime mover, The output portion is provided offset to a side of the prime mover on which the drive sprocket is disposed.

"Function" By having the above-described configuration, the present invention enables the center of rotation of the drive sprocket to coincide with the center of swing of the swing arm while minimizing the reduction in the space behind the prime mover.

"Embodiment" A preferred embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Note that the same reference numerals are used for parts common to those in FIG. 1 and FIG. 2 to simplify the explanation.

The rear wheel suspension system for a vehicle shown in this embodiment includes a swing arm 14 that is swingably supported by a bearing 13 provided on a body frame 12 of a vehicle l and extends toward the rear of the vehicle l. , a rear wheel 8 rotatably attached to the swinging end of the swing arm I4 and connected to a drive sprocket 15 of the prime mover 5 mounted on the vehicle body frame 12 via a winding transmission member 7. , surface bearing part 1
Reference numeral 3 denotes a support shaft 16 passing through the rear end of the motor 5 in the width direction of the vehicle 1, and a pair of bearings 17 fitted to both ends of the support shaft 16 and to which the swing arm 14 is integrally connected.
The drive sprocket 15 is rotatably attached to one end of the support shaft 16, and is connected to the output section 19 of the power train 6 provided in the prime mover 5. The output section 19 has a schematic configuration in which it is biased toward the side of the motor 5 on which the drive sprocket 15 is disposed.

Next, to explain these details, a part of the vehicle body frame 12 is attached to the prime mover 5 as shown in FIG.
One of the vehicle body frames 12, that is, the lower side in FIG. 4 where the drive sprocket 15 of the prime mover 5 is provided, has a bearing section. It is located in front of 13. One body frame 12 is integrally provided with a support plate 20 extending rearward, and the other body frame 12 is integrally provided with a support plate 21 extending forward. , both support plates 2
The bearing portion 13 is provided between 0.21 and 0.21.

The support shaft 16 constituting the bearing portion 13 passes through the rear end of the prime mover 5 in the width direction of the vehicle 1 behind the one vehicle body frame 12, and extends through the support plate 20.
Bearings 17 and 18, which are other components of the bearing section 13, are attached between the support plates 20 and 21.
．． 21 and each side of the motor 5, and is rotatably fitted to the support shaft 16, and each of these bearings 17, 18
is integrated with the front end of the swing arm 14 and serves as the center of swing of the swing arm 14. Furthermore, of the two bearings 17 and 18, the bearing 17 disposed on the -" side of the vehicle body frame 12 is formed flat in the width direction of the vehicle i, so as to form a gap with the prime mover 5. It has become.

The output section 19 is rotatably provided on one side wall of the prime mover 5 while penetrating the second side wall, and is connected to the prime mover 5.
an output shaft 22 on which the drive sprocket 15 is coaxially attached to a protruding portion of the output shaft 22; an output that is integrally attached to the outer periphery of the output shaft 22 and meshes with a counter gear 23 of the power train 6; It is composed of a gear 24. The output shaft 22 has a distance to penetrate one side wall of the prime mover 5, a mounting allowance for the drive sprocket 15 and the output gear 24, and a set of bearings 25 for rotatably attaching the output shaft 22 to the prime mover 5. The output portion 19 is formed to have a length approximately equal to the installation allowance, and is thereby set so that the output portion 19 is offset toward one side of the motor 5 from the center portion in the width direction. Further, the output shaft 22 is formed hollow, and the support shaft 16 is inserted therethrough so as to be relatively rotatable.

On the other hand, as shown in FIG. 4, the rear end of the prime mover 5 has a large cutout in a portion other than the position covering the output section 19, so that a cushion 9 can be attached to the rear of the prime mover 5. A space is formed.

Thus, in the rear wheel suspension system of this embodiment configured as described above, the support shaft 16 constituting the bearing portion 13 is connected to both bearings 17 and 18 integrated with the swing arm 14 and the prime mover 5.
A cushion is inserted between the output shaft 22 of the swing arm 14 and the vehicle body frame 12, and its both ends are locked to the support plate 20.21. By interposing 9, it can be attached to the vehicle body frame 12.

In the rear wheel suspension system installed in this manner, the output shaft 22 to which the drive sprocket 15 is attached and the support shaft 16 are arranged coaxially, so that the swing center of the swing arm 14 and the output shaft are arranged coaxially. 22, that is, the center of rotation of the drive sprocket 15, can be made to coincide with each other, thereby suppressing fluctuations in the tension of the wrapped transmission member 7 caused by vertical movement of the rear wheel 8.

In addition, since the output section 19 that transmits the driving force to the drive sprocket 15 is biased to one side in the width direction of the prime mover 5, a notch can be formed in the center of the rear end of the prime mover 5. Drive sprocket 15 as shown
Even if the cushion 9 is shifted to the rear of the prime mover 5, a sufficient space can be secured for mounting the cushion 9 near the center of swing of the swing arm 14.

Therefore, the influence on the layout of the cushion 9 and the like can be suppressed as much as possible, and fluctuations in the tension of the wrapped transmission member 7 can be suppressed.

It should be noted that the shapes and dimensions of each component shown in the above embodiments are merely examples, and can be variously changed based on design requirements and the like.

"Effects of the Invention" As explained above, in the rear wheel suspension system for a vehicle according to the present invention, the bearing part that supports the swing arm is connected to the support shaft that passes through the rear end of the prime mover in the width direction of the vehicle. A drive sprocket that outputs driving force to a rear wheel attached to the swing arm, and includes a bearing that is fitted to both ends of the support shaft and to which the swing arm is integrally connected.
It is rotatably attached to one end of the support shaft and is connected to an output section of a power train provided in the prime mover, and the output section is connected to a side of the prime mover on which the drive sprocket is disposed. It is characterized by being offset to the side, ensuring sufficient space at the rear central part of the prime mover and aligning the swing center of the swing arm with the rotation center of the drive sprocket. This has excellent effects such as being able to suppress fluctuations in the tension of the wrapped transmission member due to the vertical movement of the wheel, and ensuring flexibility in the layout of accessories such as cushions.

[Brief explanation of the drawing]

Figures 1 and 2 show an example of a conventional rear wheel suspension system. Figure 1 is a side view of a motorcycle equipped with the rear wheel suspension system, and Figure 2 is a partially sectional view of the motorcycle. A plan view of the section;
3 and 4 show an embodiment of the present invention,
FIG. 3 is a diagram similar to FIG. 1 and FIG. 4 is a diagram similar to FIG. 2. ■... Vehicle, 5... Prime mover, 6... Power train, 7... Wrap transmission member, 8... Rear wheel, 11...
Driven gear, 12...Vehicle frame, 13...Bearing portion, 14...Swing arm, 15...Drive sprocket, 16...Support shaft, 17.18...Bearing, 19...Output Part, 22... Output shaft, 23...
Counter gear, 24...output gear.

Claims (1)

[Claims] a swing arm that is swingably supported by a bearing provided on a body frame of a vehicle and extends toward the rear of the vehicle; a swing arm that is rotatably attached to a swing end of the swing arm; In a rear wheel suspension system for a vehicle that includes a wheel connected to a drive sprocket of a prime mover mounted on a vehicle body frame via a winding transmission member, the bearing portion passes through a rear end of the prime mover in the width direction of the vehicle. The drive sprocket is rotatably attached to one end of the support shaft, and the drive sprocket is rotatably attached to one end of the support shaft. and is connected to an output section of a power train provided in the prime mover, and the output section is provided offset to a side of the prime mover on the side where the drive sprocket is disposed. Rear wheel suspension system for vehicles.