JPS61171947A - V-belt speed change gear - Google Patents

Abstract

PURPOSE:To selectively change the number of revolution of speed change by dividing a rear cushion plate which is placed at the back of a centrifugal roller of a drive V-pulley, into two, and making one of the divided plate travel to increase or reduce the number of centrifugal rollers which operate effectively. CONSTITUTION:A rear cushion plate is in contact with the back of centrifugal rollers 14, 14a of a drive V-pulley having V-pulley 8 and V-belt (a). The rear plate consists of a fixed rear cushion plate 15 which is welded and fixed to a spacer 10, and a movable rear cushion plate 16 which is slidable in the axial direction. Accordingly, the number of centrifugal rollers which operate effectively, can be increased and reduced, enabling speed change characteristics to be desirably adjusted.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to a V-belt transmission that utilizes centrifugal force.

[Technical background of the invention and its problems]

Automatic V-belt transmissions used in the transmission systems of motorcycles, etc. consist of a drive pulley and a driven V pulley, each with a fixed face and a movable face. On the opposite side, a spring and a torque cam apply thrust force to the movable face, and the balance between the two thrust forces allows the gears to move forward or backward. Generally, a centrifugal force is used, and an inclined surface is used to generate a component force in the thrust direction. Therefore, the thrust force required for gear shifting is set by the mass of the centrifugal roller, the angle of the inclined surface, and the number of revolutions, but after determining the specifications, it can be divided into low-speed type and high-speed type based on the relationship between the speed-changing characteristics and the number of revolutions. However, there is a problem of the skill level or the preference of the user, and furthermore, it is not possible to satisfy the conditions such as when running on a flat surface or during 1V temporary running.

[Purpose of the invention]

In view of the above-mentioned problems, the purpose of the present invention is to provide a V-V that allows the rider to selectively change the desired speed change speed according to his/her will.
This is an attempt to obtain a belt transmission.

[Summary of the invention]

In order to achieve the above object, the V-belt transmission of the present invention is constructed as follows. In other words, a drive pulley is composed of a fixed face fixed to the lnilive shaft and a movable face that is slidable in the axial direction, and a reaction plate fixed to the drive shaft faces the back of the movable face and a movable face that is slidable in the axial direction. A plurality of centrifugal rollers are interposed between the movable face and the movable face is pushed toward the fixed face by the axial component of centrifugal force generated by the centrifugal rollers on the inclined surface formed on the back of the movable face, the reaction plate, or both. In the V-belt transmission, the plurality of centrifugal rollers are divided into two groups each arranged in a well-balanced manner around the drive shaft, and the reaction plate is divided into two groups so as to contact only the centrifugal rollers of each group. The reaction plate is separated into two, one of the divided reaction plates is slidable in the axial direction, and an operating member is provided for selectively moving the reaction plate forward and backward.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings showing embodiments of the present invention will be explained below. 1st
The figure is a vertical sectional side view of the drive shaft 1 upward, and Figure 2 is Figure 1 A.
- It is a rear view as seen from arrow A.

Reference numeral 1 denotes a drive shaft, which is rotatably supported by the engine crankshaft 2 and receives rotation from the crankshaft 2 via a starting clutch 5 constituted by a centrifugal shoe 3 and a clutch housing 4. A drive pulley 8 consisting of a fixed face 6 and a movable face 7 is mounted on the drive shaft 1, and suspends a belt 9. The fixed face t6 is welded and fixed to one end of the drive shaft 1, and the movable face 7 is supported slidably in the axial direction by a spline 11 of a spacer 10 integrally connected to the drive shaft 1. The back surface of the movable face 7 is formed into an inclined surface 12 that slopes backward in the centrifugal direction, and at the same time, six radial concave chambers 13 are formed by partition walls, and each concave chamber 1
A centrifugal roller 14° 14a is housed in 3. A reaction plate lies behind the centrifugal roller 14.14a.

2, the action plate has a radial shape with the outer side inclined forward at 120 degree intervals, as shown in FIG.
A fixed reaction plate 15 welded and fixed to the spacer 10 and a movable reaction plate 1 that has a similar radial shape and is arranged 60 degrees out of phase and is slidable in the axial direction.
6. Both action plates 15
．． 16 are in contact with the backs of the six centrifugal rollers 14, 14a every other time. A sub-spacer 17 is integrally arranged in parallel with the spacer 10, and a spline 18 is formed on the outer periphery. The movable reaction plate 16 is guided by the spline 18, and at the same time, a release ring 21 is connected to the rear of the movable reaction plate 16 via a slide piece bearing 20, and the release ring 21 is in contact with a cam 22 fixed to a crankcase or the like. When the release ring 21 is rotated by operating the operating member, the cam 2
2, the release ring 21, slide piece 19, and movable reaction plate 16 move forward and backward. An elastic spring 23 is elastically mounted between the movable reaction plate 16 and the slide piece 19.

With the above configuration, this drive V pulley operates as follows.

The movable reaction plate 16 can be moved by operating the operating member.
is moving forward, the six centrifugal rollers 1 are moved by the inclined surface 12 and the inclined surfaces of both action plates 15,16
The axial component of the centrifugal force 4.14a acts as a thrust force on the movable face 7. This thrust force increases the suspension effective diameter of the belt 9, and as the number of rotations of the drive shaft 1 increases, the belt shifts to a high speed range, but in this case, the speed is changed in six relatively low speed rotation bands. Conversely, when the operating member is operated to move the slide piece 19 backward, the three centrifugal rollers 1 are applied to the movable reaction plate 16.
Since the axial component of the centrifugal force 4a exceeds the elasticity of the spring 23, the movable reaction plate 16 retreats and the centrifugal roller 14a becomes ineffective. Therefore, the thrust force applied to the movable face 7 is generated by the remaining three centrifugal rollers 14, and the speed is changed in the high rotation speed range of the drive shaft 1.

That is, the rider can select between a high-speed type shifting characteristic and a low-speed type shifting characteristic by using the operating member, and can match it to his preference and level of skill. Although we cannot ignore the output characteristics of the engine and the load adjustment using the torque cam on the driven V-boot side, speaking only from the drive jib side,
The low-speed type is suitable for beginners, while the high-speed type satisfies the tastes of experienced riders.

〔Effect of the invention〕

As described above, the V-belt transmission according to the present invention is effective by dividing the reaction plate placed behind the centrifugal roller into two parts and moving one of them forward and backward in the drive V-pulley that controls the speed range. By increasing or decreasing the number of centrifugal rollers that act on the vehicle, the speed change characteristics can be adjusted to high-speed or low-speed, allowing you to choose between high-level driving techniques and easy riding. By simply adding a split reaction plate and an operating mechanism to the conventional drive pulley mechanism, only a small number of parts need to be changed, and the functionality of this type of V-belt transmission has been greatly improved. It has the effect of greatly enhancing the performance and product value of wheeled vehicles, etc.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention.
- FIG. 2 is a vertical cross-sectional side view taken along arrow A--A in FIG. 1. 1... Drive shaft, 6... Fixed face, 7...
Movable face, 9...V belt, 14, 14a...
Centrifugal roller, 15...Fixed reaction plate, 1
6...Movable reaction plate. Applicant's agent Hisashi Hatano, Tsune I

Claims (1)

[Claims] A drive V pulley is configured by a fixed face fixed to the drive shaft and a movable face that is slidable in the axial direction,
V that presses the movable face toward the fixed face side by the centrifugal force in the axial direction of a plurality of centrifugal rollers interposed between the back surface of the movable face and a plate fixed to the drive shaft facing the movable face. In the belt transmission, the plurality of centrifugal rollers are divided into two groups arranged in a well-balanced manner around the drive shaft, and the ramp plate is separated into two parts so as to contact only the centrifugal rollers of each group, and one of the plurality of centrifugal rollers is divided into two groups. A V-belt transmission characterized in that the divided ramp plate is slidable in the axial direction on the drive shaft and is provided with an operating member for selectively advancing and retracting the divided ramp plate.