JPS60104481A - Drive for chain of motorcycle, etc. - 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 provides a wide tire rear wheel installed at the rear end of the rear arm.
The present invention relates to a engine drive device for a motorcycle, a three-wheeled vehicle, etc. (hereinafter referred to as a motorcycle).

[Prior art]

Wide tie-1 with low air pressure of 0.1 to 0.3 kg/cJ, g on the rear wheel.
There is a motorcycle equipped with -1.). Since this motorcycle has a wide rear wheel, it is not possible to transmit the power from the engine to the rear wheel with just one chain, so an intermediate shaft is interposed between the engine output shaft and the rear wheel. The signal is transmitted by two chinos via an intermediate shaft. However, in the conventional chino drive device, since the intermediate shaft is provided on the pin axis of the rear arm, there is a problem in that the sprocket on the intermediate shaft restricts the position where the driver's feet are placed.

In order to solve this problem, an invention in which the intermediate shaft described in 2 was provided on the rear arm was published in the patent application filed in 1983-1318.
Suggested by 53%. However, the problem with installing the intermediate shaft on the rear arm in this way is that the vehicle width becomes wider and the vehicle body length increases due to the arrangement of the primary chain sprocket and the secondary chain sprocket on the intermediate shaft. It means getting bigger. That is, if both sprockets are placed on the outside of the rear arm, the vehicle width will increase, and if they are placed on the inside of the rear arm, the length of the car body must be increased to avoid interference with the rear wheel. Furthermore, since the intermediate shaft is extended in a cantilevered manner to support both sprockets, the bending moment becomes large and the shaft must be made thicker.

[Purpose and outline of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a chain drive device for a motorcycle or the like that can reduce the diameters of the intermediate shafts without increasing the width or length of the vehicle.

The present invention achieves the above object by providing a rear wheel made of a wide tire at the rear end of the rear arm, and connecting the rear wheel to the intermediate shaft and the engine output shaft through the intermediate shaft on the rear arm. The primary chain between and the secondary chain between the intermediate shaft and the rear wheel 7
In a motorcycle or the like that is intended to be driven by a vehicle, the intermediate portion of the intermediate shaft is supported on a rear arm, and the intermediate shaft protrudes from both left and right sides of the rear arm)! The sprocket of the secondary chain is fixed to one end, and the sprocket of the secondary chain 7 is fixed to the other end.

[Embodiments of the invention]

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

In the figure, 1 is the main frame, 2 is the engine mounted below it, 3 is the front wheel, and 4 is the rear wheel. A seat 6 is provided on a seat rail 5 extending rearward from the main frame 1.

The rear wheel 4 is a low-pressure wide tire with an internal pressure of about 0.1 to 0.3 kg/cn, g, and its width is about the same as or slightly wider than the engine 2 or the seat rail 5. The rear wheel 4 of this wide tire is supported by the rear ends of left and right rear arms 7.7, and the front ends of the rear arms 7 are pivotally supported on the bibono shaft 8 at the rear of the main frame 1. Also, the middle part has a buffer 9
It is elastically supported by the frame via.

An intermediate shaft 10 is supported at an intermediate position of the rear frame 7 on one side, and both ends of the shaft protrude to both left and right sides of the rear arm 7. One sprocket on each end of the shaft.
2.13 is fixed. The engine output shaft (crankshaft) is attached to the sprocket 12 provided inside the rear arm 7.
Between the sprocket II fixed to the primary chain 1
6 is wound around, and the sprue I- provided on the outside of the rear arm 7.
A secondary chain 17 is wound around the J-kenoto 13 between it and a sprocket 14 fixed to the rear wheel. Power from the engine 2 is transmitted to the rear wheels 4 via the primary chain 16 and the secondary chain 717. Pivot position of rear arm 7] - In front of shaft 8, footrests 27, 27 are provided on both sides of the vehicle body, respectively.

The rear arm 7 on the side supporting the intermediate shaft 10 is separated into two members: a sheet metal member 7a at the front and a reed member 7b at the rear.
The shaft support member 1 of the intermediate shaft 10 is provided between the two members 7a and 7b.
8 is interposed and welded. Further, the sheet metal member 7a is connected to the other rear arm 7, and further connected to the extraction member 7b via a diagonal reinforcing member 26.

As shown in FIG. 3, the intermediate shaft 10 is rotatably supported by a shaft support member 18 via a bearing 19. As shown in FIG. intermediate shaft 10
Splines 20 and 21 are carved on both ends of the
A sprocket 12 meshes with one spline 20, and a sprocket 13 meshes with the other spline 21. The sprocket 13 is held down by an internally toothed plate 23 fitted into the groove 22, and is integrally fixed to the internally toothed plate 23 by bolts 24. In this state, tighten the nut 25 on the shaft end on the other sprocket 12 side.
are joined together and tightened (-J), thereby fixing both the shaft brackets 12 and 13 on the intermediate shaft 10. In such a fixed state, both edges of the shaft support member 18 are flat. In the visual state, they are partially overlapped and overlapped with Cheno 16 and 17, respectively.

As mentioned above, the intermediate portion of the intermediate shaft 10 is connected to the rear arm 7.
It is supported so as to cross the rear arm 7, and both shaft ends protrude to the left and right sides of the rear arm 7, and subblocks (12 and 13) with choreography numbers J are fixed to both sides. Therefore, both sprockeno l-1,
The width of the vehicle body is narrower than in the case where 2 and 13 are disposed on either one of the rear arms 7, and interference with the rear wheels 4 is eliminated so that the length of the vehicle body does not increase. Also, the intermediate shaft 10
The bending moment applied to the rear arm 7 becomes smaller because the protruding length from the support point of the rear arm 7 is shortened, so that the shaft diameter can be reduced.

Although the above-mentioned embodiment is a case of a motorcycle, the present invention is also applicable to a tricycle in which the front wheels 3 are two wheels.

〔Effect of the invention〕

As described above, the chenno drive system of the present invention has one rear wheel made of a wide tire at the rear end of the rear arm, and connects this rear wheel with the intermediate shaft of the rear arm through the intermediate shaft of the rear arm. In a motorcycle or the like that is intended to be driven by a primary chain between the intermediate shaft and a secondary chain between the intermediate shaft and the rear wheel, the intermediate part of the intermediate shaft is supported on the rear arm, and the intermediate part of the intermediate shaft is supported on the rear arm, and protrudes from both left and right sides of the rear arm. Since the sprocket of the secondary engine is fixed to one end of each of the intermediate shafts, and the sprocket of the secondary chain is fixed to the other end, the vehicle width can be increased by distributing both sprockets to the left and right sides of the rear arm. There is no need to increase the length of the vehicle or increase the length of the vehicle. In addition, since the protruding length of the intermediate shaft from the rear arm is shortened, the bending moment can be reduced, thereby making it possible to reduce the shaft diameter.

[Brief explanation of drawings]

FIG. 1 is a side view of a motorcycle equipped with a chino drive device according to the present invention, FIG. 2 is a plan view showing only the essential parts of the motorcycle, and FIG. 3 is an enlarged sectional view of an intermediate shaft portion. 2... Engine, 4... L&wheel, 7... Rear arm, 10... Intermediate shaft, 11, 12.13.14...
Sprocket, 15...engine output shaft, 16°F...cheno, 18...shaft support member.

Claims (1)

[Claims] One rear wheel consisting of a wide tie is provided at the rear end of the rear arm, and this rear wheel is connected to the primary chain between the intermediate shaft and the engine output shaft via the intermediate shaft on the rear arm, and the intermediate shaft and the rear wheel. In a motorcycle or the like that is driven by a secondary chain between the wheels, the intermediate portion of the intermediate shaft is supported on the rear arm, and the intermediate shaft protrudes on both left and right sides of the rear arm.
The sprocket of the secondary engine is fixed, and the sprocket of the secondary engine is fixed to the other side, which is a 4.