JPS61232980A - Gearing for 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 (Technical Field of the Invention) The present invention relates to a transmission device for a two-wheeled motor vehicle for transmitting power from an engine to drive wheels.

[Technical background of the invention and its problems]

Generally, in motorcycles, the engine is installed at a certain distance from the drive wheels (mostly the rear wheels) due to the layout, and the transmission system that connects the two uses a transmission mechanism such as a chain, belt, or shaft. There is. Although these mechanisms are useful because they have a deceleration function, they still have problems such as a large amount of mechanical loss, being a source of noise, and concerns about durability.

[Purpose of the invention]

In view of the above-mentioned problems, this invention provides chains, belts,
The purpose of the present invention is to provide a transmission device that is compact by installing an engine near drive wheels without using a shaft or the like, and that can satisfy a required reduction ratio.

[Summary of the invention]

In order to achieve the above object, a transmission device for a motorcycle according to the present invention has the following configuration.

It is composed of a crankshaft, a driven shaft arranged parallel to the crankshaft, and a drive wheel axle arranged coaxially on the axial extension of the driven shaft, and a reduction gear is meshed between the crankshaft and the driven shaft, It is characterized in that a planetary aperture mechanism is interposed between the driven shaft and the drive wheel axle.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings showing embodiments of the present invention will be explained below.

In FIG. 1, reference numeral 1 denotes an engine, which is disposed close to one side of the driving wheels 2. As shown in FIG. A drive gear 5 that transmits rotation via a centrifugal clutch 4 is supported on the engine crankshaft 3 on the side closer to the drive wheel 2, and meshes with a driven gear 7 fixed to a driven shaft 6. The driven shaft 6 is mounted in a transmission chamber 8 in parallel with the crankshaft 3, and is primarily decelerated by the drive gear 5 and driven gear 7 to transmit rotation. A coaxial drive wheel axle 9 is supported by a bearing 10.11 on the extension line of the axis of the driven shaft 6, and one end of the drive wheel axle 9 protrudes outside the transmission chamber 8.
It is pivoted. 12 is a brake drum, and 13 is a brake panel that supports brake shoes.

A planetary roller mechanism is interposed between the opposite ends of the driven shaft 6 and the driving wheel axle 9, and transmits rotation by secondary deceleration. That is, a sun roller 14 is formed in the driven lN16@, a ring roller 15 is fixed to the mission chamber 8 on the outer periphery of the sun roller 14, and a pinion roller 16 is held between the two with a certain degree of pressure.

The pinion roller 16 is rotatably supported by a carrier 17 extending from the end of the drive wheel axle 9.

When the sun roller 14 rotates, the binion roller 16 moves along the ring roller 15 and transmits its revolution to the drive wheel axle 9. Reference numeral 18 indicates a locking key for the ring roller 15. Further, 19 is a bearing that supports the other end of the driven shaft 6.

In the figure, 20 indicates a magneto mounted on the crankshaft 3a on the opposite side of the drive wheel 2, and 21 indicates an oil pump. The input shaft of the oil pump 21 is installed coaxially opposite the end of the driven shaft 6, with a protrusion 22 on the end surface and a groove 23 on the end of the driven shaft 6.
driven by engagement with the

With the above structure, the driving force of the engine is transmitted from the crankshaft 3 to the driven shaft 6 via the primary reduction gears 5 and 6, and then secondarily reduced by the planetary roller mechanism and transmitted to the drive wheels 2.

FIG. 3 shows another embodiment. The driven shaft 6 is shortened and supported only by the planetary roller mechanism. The planetary roller mechanism functions as one large roller bearing, and since the drive wheel axle 9 is stably supported by the bearings 10 and 11, the driven shaft 6 is held stably. The oil pump 21a is driven by an oil pump drive gear 24 that meshes with the driven gear 7.

This oil pump drive gear 24 uses a synthetic resin molded product.

〔Effect of the invention〕

As mentioned above, the transmission device for a motorcycle according to the present invention includes:
The driven shaft, which is primarily decelerated from the crankshaft by a simple reduction gear mechanism, and the driving wheel axle face each other on the same axis, and a planetary roller mechanism is interposed between the two wheels to achieve secondary deceleration. , the engine can be compactly disposed close to one side of the drive wheels, and the front wheels having a steering function can also be easily used as the drive wheels. Since the planetary roller mechanism is used, the required reduction ratio can be set easily and with a simple structure, and the reduction ratio of the second reduction gear mechanism can be set small, so one step of reduction is sufficient, and at the same time, the planetary roller Since the mechanism transmits torque by traction, the shock torque generated in the transmission system is cushioned by slip, and the use of a separate damper mechanism can be omitted. In addition, since it does not use a transmission mechanism such as a chain, belt, or shaft, it has improved durability, generates less noise, and
, which has the effect of significantly reducing costs.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a two-wheeled motor vehicle transmission system showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional side view of the same planetary roller mechanism, and Fig. 3 is a two-wheeled motor vehicle transmission system showing another embodiment. FIG. 2 is a longitudinal side view of the system. DESCRIPTION OF SYMBOLS 1... Engine, 2... Drive wheel, 3... Crankshaft, 5... Drive gear, 6... Driven shaft, 7...
...Driven gear, 9...Drive wheel axle, 14...
- Sun roller, 15...Ring roller, 16 Binion roller, 17...Carrier, 22...Oil pump. Applicant's agent Hisada Hatano Figure

Claims (1)

[Claims] It consists of a crankshaft, a driven shaft arranged parallel to the crankshaft, and a drive wheel axle arranged coaxially on the axial extension of the driven shaft, and a reduction gear is meshed between the crankshaft and the driven shaft, A transmission device for a two-wheeled motor vehicle, characterized in that a planetary roller mechanism is interposed between a driven shaft and a drive wheel axle.