JPH05278669A - Driving device for motorcycle - Google Patents

Abstract

PURPOSE:To provide a driving device for motorcycle wchich is compact, excellent in workability, and capable of making continuously variable automatic speed change by assembling a torque converter, a speed change planetary gear, and a speed reduction planetary gear coaxially with a rear wheel axle. CONSTITUTION:A speed change sun gear 8, a intermediate shaft 12, and a rear wheel axle 11 are positioned coaxially, and the speed change sun gear 8, a pump 99 for a torque converter, and an oil pump 10 are driven by a drive shaft 6 of a moter 5. A speed change ring gear 16 is provided on a turbine 14 of the torque converter, and a one-way clutch 15 is connected between the turbine 14 and a case 3. A speed change planetary gear 17 is pivoted on the intermediate shaft 12, and a speed reducing ring gear 18 is provided in the case 3. Then a speed reducing sun gear 19 is provided on the intermediate shaft 12, and a speed reducing planetary gear 20 is pivoted on the rear wheel axle 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive system for a motorcycle equipped with a continuously variable transmission that uses an electric motor or the like as a power source.

[0002]

2. Description of the Related Art In industrial machines, a continuously variable transmission using a V-belt and a planetary gear is known. Also, in a four-wheeled vehicle, there is an automatic transmission that uses a torque converter and a planetary gear.

[0003]

A continuously variable transmission using a V-belt and a planetary gear has a large device and is not suitable for a small motorcycle or the like. In addition, the automatic transmission that uses the torque converter and planetary gears of a four-wheeled vehicle is
It is not continuously variable.

In view of the above point, the present invention has a torque converter, a planetary gear for speed change and a planetary gear for speed reduction arranged coaxially with the rear wheel axle, and is small in size and has good workability and is capable of continuously variable automatic transmission. The purpose is to obtain a driving device of.

[0005]

In order to achieve the above object, the drive system for a motorcycle according to the present invention has a speed changing sun gear, an intermediate shaft and a rear wheel axle arranged concentrically, and a drive shaft of a motor. Drives the sun gear for speed change, the pump of the torque converter and the oil pump, installs the ring gear for speed change on the turbine of the torque converter, connects the one-way clutch between the turbine and the case, and supports the planetary gear for speed change on the intermediate shaft. Then, the reduction ring gear was attached to the case, the reduction sun gear was attached to the intermediate shaft, and the reduction planetary gear was pivotally supported on the rear wheel axle.

[0006]

[Operation] By arranging the torque converter, the speed-changing planetary gear and the speed-reducing planetary gear coaxially with the rear wheel axle,
The device becomes compact, the axial length can be shortened, and cutting work becomes easy. The drive shaft of the motor drives not only the sun gear for shifting but also the pump of the torque converter and the oil pump, and outputs the output to the intermediate shaft via the planetary gear for shifting. Therefore, a large reduction ratio can be achieved as a characteristic of the planetary gear. Further, since the reduction gear ratio is large, the motor can be driven and the vehicle can immediately start. The torque that has entered the torque converter gradually rotates the turbine from the stalled state, and when the rotational difference is large, the torque is increased. In this way, the rotation of the speed-change ring gear increases, and the rotation of the intermediate shaft that supports the speed-change planetary gear increases. The motor can rotate at a constant speed and can be operated efficiently. Eventually, the speed changing sun gear and the speed changing ring gear rotate in the same manner, and the speed changing planetary gear rotates integrally. If the load changes due to climbing on a slope, increase the torque of the torque converter.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. A rear fork 2 for suspending the rear wheel 1 has an outer side formed on a case 3 of the torque converter, and connects an outer case 4 to the outer side. An electric motor 5 is attached to the outer case 4. The drive shaft 6 of the motor 5 drives a speed changing sun gear 8, a torque converter pump 9 and an oil pump 10 via a miter gear 7. The rear wheel axle 11, the intermediate shaft 12, and the speed changing sun gear 8 are arranged concentrically. A stator 13 of a torque converter is attached to the case 3, and a one-way clutch 15 is attached between a turbine 14 of the torque converter and the case 3. The turbine 14 has a transmission ring gear 1
6 is mounted, and a planetary gear 17 for speed change is rotatably supported on the intermediate shaft 12.

On the other hand, the reduction ring gear 18 is fixed to the case 2, the reduction sun gear 19 is attached to the end of the intermediate shaft 12, and the reduction planetary gear 20 is pivotally supported on the rear wheel axle 11. The shaft support member 21 of the rear wheel 1 is inserted into the rear wheel axle 11 and fastened.

A drive shaft 6 of the motor 5 drives a speed changing sun gear 8, a torque converter pump 9 and an oil pump 10. The speed change ring gear 16 is attached to the turbine 14 of the torque converter.
Reference numeral 4 denotes a one-way clutch 15 on the case 2, which rotates only in the driving direction. The speed-changing sun gear 8 causes the speed-changing planetary gear 17 to rotate and revolves the intermediate shaft 12 around the speed-changing sun gear 8. And the intermediate shaft 12 is
The rear wheel axle 11 is decelerated by the deceleration sun gear 19, the deceleration ring gear 18, and the deceleration planetary gear 20.
To drive. The oil pump 10 sends oil to the pump 9 and rotates the turbine 14 as the rotation increases.
The turbine 14 increases the torque, and the speed change ring gear 1
Rotate 6. When the driving force of the transmission ring gear 16 from the turbine 14 increases due to the reaction force applied to the transmission sun gear 8 and the transmission ring gear 16 via the transmission planetary gear 17 of the intermediate shaft 12, the transmission ring gear 16 increases. The gear 16 rotates and the intermediate shaft 12 accelerates. Finally, the speed change sun gear 8 and the speed change ring gear 16 rotate in the same manner, and the direct connection state is established.
If the load suddenly increases during traveling, a difference in rotation between the turbine 14 and the pump 9 is created, increasing the torque and decelerating.

As described above, since the present invention is configured as described above, the torque converter and the planetary gear can be arranged concentrically with the rear wheel axle 11, and the machining such as the case 2 can be automated. It is possible to provide a continuously variable transmission that is easy, compact, and suitable for motorcycles. Further, the torque converter and the like are overhung on one side of the rear wheel 1, but a heavy one such as a battery may be stacked on the opposite side.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

[Explanation of symbols] 3 case 5 motor 6 drive shaft 8 sun gear for speed change 9 pump 10 oil pump 11 rear wheel axle 12 intermediate shaft 14 turbine 15 one-way clutch 16 speed change ring gear 17 speed change planetary gear 18 speed reduction ring gear 19 Sun gear for speed reduction 20 Planetary gear for speed reduction

Claims (1)

[Claims] 1. A speed changing sun gear, an intermediate shaft, and a rear wheel axle are arranged concentrically, and a speed changing sun gear, a torque converter pump, and an oil pump are driven by a motor drive shaft, and a speed changing turbine is used for speed changing. Attach the ring gear, connect the one-way clutch between the turbine and the case, pivotally support the speed change planetary gear on the intermediate shaft, attach the reduction ring gear to the case, attach the reduction sun gear to the intermediate shaft, and rear wheel. A drive device for a motorcycle characterized in that a planetary gear for reduction is pivotally supported on an axle.