JPS6324284Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transmission device for, for example, a two-wheeled motor vehicle.

Conventionally, in this type of transmission device, an output shaft of a drive source is connected to an input shaft of a gear train that projects outward through the side wall of a gear case that houses a gear train connected to the axle of a rear wheel serving as a load. A device is known in which an input pulley is provided which is driven by a pulley via a belt, and in this case, a bearing recess for receiving one of the gear shafts of the gear train is provided on the outside of the side wall of the gear case. In order to prevent undue twisting or bending from being applied to the gear shaft, the outside of the recess is formed to bulge out to the outside of the gear case. In order to prevent contact between the bearing recess and the input pulley, either increase the axial distance between the two members, or
It is necessary to improve the machining accuracy and assembly precision of both members, which increases the axial dimension of the device and reduces productivity.

The purpose of the present invention is to provide a transmission device that eliminates such inconveniences, and the gear train is connected to a crankcase 20 that supports a crankshaft 8 perpendicular to the direction of movement of the vehicle body and a rear wheel 2 on the centerline of the vehicle body. A transmission case main body 3 that is integrated with a gear case 5 that houses a gear train 7 has an output pulley 9 provided at one end of the crankshaft 8 and a variable input pulley 11 provided on the input shaft 12 of the gear train 7. Connecting belt 1
0, the gear case 5 is provided with a cover 4 that supports each shaft of the gear train 7, and the variable input pulley 11 and the gear train 7 are connected via the cover 4. The bearing recess 16 which is disposed facing each other and receives the intermediate shaft 15 of the cover 4 is bulged outward, and the bulge 21 is connected to the outer periphery flange 17 of the fixed side main body of the variable input pulley 11 and the central hole 18. They are characterized in that they are disposed facing each other in the recess 19 between them.

An example of implementing the present invention will be explained with reference to attached drawings.

The drawing shows the transmission device of the present invention applied to a two-wheeled motor vehicle. Reference numeral 1 indicates an engine as a driving source, and 2 indicates a rear wheel as a load. A gear case 5 is formed by attaching a transmission cover 4 to the rear part of the transmission case main body 3, which is provided with a transmission case body 3.
The case 5 houses a gear train 7 connected to an axle 6 of the case 5.
The output pulley 9 on the crankshaft 8 in the crankcase 20 of the engine 1 is connected to the input shaft 12 of the gear train 7, which is projected outwardly through the cover 4, which is a side wall of the engine 1, through the V-belt 10. The input pulley 11 to be driven is loosely fitted, and the rotation of the input pulley 11 is transmitted to the input shaft 12 via a centrifugal clutch 13 provided at the outer end of the input shaft 12. Note that 14 in the figure indicates a case cover of the transmission case main body 3. The gear train 7 includes a gear case 5
The large gear on the axle 6 and the input shaft 12 housed in the
It is composed of an upper small gear and two intermediate gears provided on an intermediate shaft 15 between the two shafts 6 and 12 so as to mesh with the two gears, and either of these gear shafts, the one shown in the figure. In this case, the outer side of the bearing recess 16 for supporting the intermediate shaft 15 bulges outward from the mission cover 4, and the bulge 21 supports the input shaft 12 in accordance with the feature of the present invention. The input pulley 11 is disposed opposite to a recess 19 formed on the inner surface between the outer peripheral flange 17 and the central hole 18 of the upper input pulley 11 .

Because of this structure, even if the input pulley 11 approaches the mission cover 4, a gap is created that can prevent interference between the input pulley 11 and the bulge 21 formed on the cover 4. , since the concave portion 19 of the input pulley 11 is formed, the transmission device can be assembled without requiring high processing accuracy and assembly accuracy of the bulge portion 21 and the input pulley 11;
Furthermore, even if the input pulley 11 oscillates laterally, it will not come into contact with the bearing recess 16.

In this way, according to the present invention, the gear case 5, which is integrated with the transmission case body 3 that houses the output pulley 9 and the variable input pulley 11, is provided with a cover 4 that supports each shaft of the gear train 7. Since the variable input pulley 11 and the gear train 7 are arranged opposite to each other via the cover 4, the pulley 11 and the gear train 7 can both be brought as close as possible to the cover 4. By shortening the length of the gear case 5, the entire transmission device can be made compact.
The bearing recess 16 for receiving the intermediate shaft 15 is made to bulge out to the outside of the cover 4, and the bulge 21 is inserted into the recess 19 between the outer periphery flange 17 of the fixed side main body of the variable input pulley 11 and the central hole 18. Since the cover 4 is disposed facing the bulging bearing recess 16 and the input pulley 11, the cover 4 can be assembled with sufficient margin without paying special attention to the machining accuracy of the bulging bearing recess 16 and the input pulley 11.

[Brief explanation of the drawing]

The drawing shows a cross-sectional view of the main parts of a two-wheeled motor vehicle equipped with the transmission device of the present invention. 1...Engine, 2...Rear wheel, 4...Mission cover, 5...Gear case, 6...Axle, 7...
... Gear train, 8 ... Crankshaft, 9 ... Output pulley, 10 ... V-belt, 11 ... Input pulley, 1
2... Input shaft, 15... Intermediate shaft, 16... Bearing recess, 17... Outer flange, 18... Center hole,
19... recess, 20... crankcase, 21...
...bulge.

Claims (1)

[Scope of utility model registration request] The crankshaft 8 is attached to a transmission case main body 3 that integrates a crankcase 20 that supports a crankshaft 8 perpendicular to the vehicle traveling direction and a gear case 5 that accommodates a gear train 7 connected to the rear wheel 2 on the centerline of the vehicle body. In a transmission mechanism that is provided with a belt 10 that connects an output pulley 9 provided at one end and a variable input pulley 11 provided on an input shaft 12 of the gear train 7, the gear case 5 is provided with the gear train 7. The variable input pulley 11 and the gear train 7 are arranged facing each other via the cover 4, and the bearing recess 16 for receiving the intermediate shaft 15 of the cover 4 is placed on the outside. A transmission device characterized in that the bulging portion 21 of the variable input pulley 11 is disposed opposite to the recess 19 between the outer periphery flange 17 and the central hole 18 of the fixed side main body of the variable input pulley 11.