JPS61233222A - Dry clutch apparatus for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce rattling between high reduction gear and the clutch housing by supporting the high reduction gear through bearing onto main shaft while spline fitting the dry clutch housing provided between main shaft to the boss section of high reduction gear. CONSTITUTION:The high reduction gear 7 gearing with the low reduction gear 6 arranged on the crank shaft 1 of internal-combustion engine is born through a roller bearing 8 on main shaft 3. While the housing 9 of dry clutch 2 for transmitting power between the high reduction gear 7 and main shaft 3 is fitted through a spline 11 to the boss section of said gear 7. Since the high reduction gear 7 and the clutch housing 9 can be held on main shaft 3 respectively through the bearings 8, 10, rattling in radial direction can be reduced considerably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a dry clutch device for an internal combustion engine, and more particularly to a dry clutch device provided in a power transmission system of a motorcycle.

[Prior art]

When a dry clutch is provided in the power transmission system of a motorcycle, the dry clutch is attached to a main shaft of a transmission that protrudes outward through a crankcase cover.

Crankshaft power input to such a dry clutch must be performed from the reducing gear located inside the crankcase cover, but the crankcase cover is interposed between the reducing gear and the dry clutch. Therefore, it is not possible to directly fix both of them. Therefore, in conventional devices, the boss part of the clutch housing of the dry clutch mounted on the main shaft is extended to the inside of the crankcase cover, and the reducing gear is spline-fitted onto this extended boss part. Ta.

However, when a reduction gear is supported via a spline in this way, it is unavoidable that some play occurs in the radial direction, and this play causes the reduction gear to tilt, causing unbalanced rotation and noise. This is likely to be the cause. In particular, in the case of an internal combustion engine in which the reducing gear is directly cut into the crank web, the distance between the shafts of the reducing gear and the reducing gear becomes large, so the diameter of the reducing gear must be increased, and the above tendency can be avoided. There is a problem that makes it easier to increase the amount of water.

[Purpose of the invention]

An object of the present invention is to provide a dry clutch device that can reduce the radial play of the reducing gear as described above, and also reduce the radial play of the clutch housing.

[Structure of the invention]

To achieve the above object, the present invention provides an internal combustion engine in which a reducing gear for inputting power from the crankshaft is arranged inside a crankcase cover through which a main shaft of a transmission passes, and a dry clutch is arranged outside. The reducing gear is supported on the main shaft via a bearing, and the clutch housing of the dry clutch is spline-fitted to the boss portion of the reducing gear, and is also supported on the main shaft via a bearing. It is something to do.

〔Example〕

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

In the figure, 1 is a crankshaft of an internal combustion engine, 2 is a dry clutch, and 3 is a main shaft of a transmission.

Further, 4 is a crankcase, and 5 is a crankcase cover provided corresponding to a transmission (not shown). The main shaft 3 penetrates the crankcase cover 5 from the inside to the outside, and the dry clutch 2 is attached to the protruding portion thereof.

A reduction gear 6 is integrally provided on the crankshaft 1, and the reduction gear 6 meshes with a large reduction gear 7. Reduction gear 7
is rotatably supported by the main shaft 3 via a roller bearing 8. The boss portion 7a of the reducing gear 7 is formed to extend outward through the crankcase cover 5.
A clutch housing 9 of the dry clutch 2 is fitted onto the extended portion via a spline 11. The clutch housing 9 spline-fitted to the boss portion 7a in this manner is simultaneously supported on the main shaft 3 via the ball bearing 10, and rotates together with the reducing gear 7. 12 and 13 are oil seals, respectively, which prevent lubricating oil inside the crankcase cover 5 from leaking to the outside.

The dry clutch 2 is connected to the boss portion 7 of the reducing gear 7 as described above.
It has a clutch housing 9 spline-fitted to the main shaft 30 and a clutch plate 14 spline-fitted to the end of the main shaft 30, and holds a plurality of friction plates 9a movably in the axial direction on the clutch housing 9 side. At the same time, a plurality of friction plates 14a are held movably in the axial direction on the clutch plate 14 side. These plurality of friction plates 9a and 14a are stacked alternately, and are normally strongly pressed in the axial direction by a pressing plate 15 biased by a compression spring 16, so that power is transferred between the clutch housing 9 and the clutch plate 14. The push rod 1 is set to a connected state a (clutch on) that allows transmission.
By moving the press plate 15 to the right side in the figure using the button 7, the above-mentioned joined state is released (clutch off).

According to the above-mentioned dry clutch device, the reducing gear 7 is supported by the main shaft 3 via the roller bearing 8, so compared to the conventional device in which the reducing gear 7 is supported by the boss portion of the clutch housing via a spline. , radial backlash can be made extremely small. Therefore, there is almost no inclination of the reduction gear 7, and no unbalanced rotation or noise is generated.

On the other hand, the clutch housing 9 is spline-fitted onto the boss portion 7a of the reduction gear 7;
At the same time, since it is configured to be supported on the main shaft 3 via the ball bearing 10, radial play is reduced. Therefore, problems such as poor clutch disengagement, which occur when the clutch housing 9 has large radial play, do not occur.

The present invention is extremely effective in the case of an internal combustion engine in which the reduction gear 6 is directly mounted on the crankshaft l and the reduction gear 7 that meshes with it has a large diameter, as in the above embodiment. However, it is also applicable when the reducing gear is provided as an intermediate gear, not directly provided on the crankshaft.

[Effects of the Invention] 4. As described above, the present invention arranges a reduction gear that inputs power from the crankshaft inside the crankcase cover through which the main shaft of the transmission passes, and a dry clutch outside. In the internal combustion engine, the reducing gear is supported on the main shaft via a bearing, the clutch housing of the dry clutch is spline-fitted to the boss portion of the reducing gear, and the gear is supported on the main shaft via a bearing. The structure is designed to support this.

Therefore, the reducing gear supported on the main shaft via a bearing can have less radial backlash than a conventional device supported via a spline. Also,
Since the clutch housing is not only spline-fitted but also supported by the main shaft via a bearing, it is possible to reduce play in the radial direction. Therefore, there is no unbalanced rotation or noise generation, and there is no problem of clutch disengagement.

[Brief explanation of drawings]

The figure is a longitudinal cross-sectional view showing a main part of an internal combustion engine for a motorcycle equipped with a dry clutch device according to an embodiment of the present invention. ■...-crankshaft, 2...-dry clutch device,
3-Main shaft, 5-Crankcase cover, 6--Reducing small gear, 7--Reducing large gear, 8--Roller bearing, 9
-・Clutch housing, 1o-・Ball bearing, 1
1...-spline.

Claims (1)

[Claims] In an internal combustion engine in which a reducing gear for inputting power from the crankshaft is arranged inside a crankcase cover through which a main shaft of a transmission passes, and a dry clutch is arranged outside, the reducing gear is supported on the main shaft. A dry clutch device for an internal combustion engine, characterized in that the clutch housing of the dry clutch is spline-fitted to the boss portion of the reducing gear, and is supported on a main shaft via a bearing.