JPH03217390A - Front and rear wheel drive motorcycle - Google Patents

Abstract

PURPOSE:To make better a left-right weight balance or the like in a car body by arranging a stepless belt transmission and a centrifugal starting clutch in each of front and rear drivers integrated with an engine at one side and setting up each of front and rear chains and a muffler at the opposite side. CONSTITUTION:In an engine 1, rear and front drivers 3, 4 are integrally installed as one body. As for the rear driver 3, its output shaft 9 is projected to the opposite side and connected to a rear wheel 10 through a rear chain 11. In addition, the front driver 4 makes its output shaft 12 jut out into the opposite side, and connected to one side of an equispeed joint 14 attached to a front fork 13 through the front chain. On the other hand, this equispeed joint 14 is connected to the front wheel 17 with a fork chain 20 and a front wheel chain 21 at the opposite side with the front chain. Moreover, the muffler 22 extends the backside at the upside of the rear chain 11 after being bent to the upside from the underside at the backside of the engine 1. With this constitution, a load distribution of both front and rear wheels and a body left-right weight balance are made better.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a front and rear wheel drive motorcycle.

(Prior Art) Motorcycles include front and rear wheel drive motorcycles in which the engine drives the rear wheels and the engine also drives the front wheels.

This front and rear wheel drive motorcycle has the advantage of being able to run smoothly even on slippery roads because the front and rear wheels are driven. The front fork, to which the front wheels are attached, performs steering, so it is driven via a universal joint or drive shaft so as not to interfere with steering. For example, JP-A-60-1
See Publication No. 8478.

(Problems to be Solved by the Invention) The drive shaft that drives the front wheels is heavy, increasing the load on the front wheels, and the weight balance between the left and right sides of the vehicle body is unbalanced, resulting in poor handling.

In view of the above, an object of the present invention is to provide a front and rear wheel drive motorcycle that has good load distribution between the front and rear wheels, good weight balance between the left and right sides of the vehicle body, light handling, and good steering performance.

(Means for Solving the Problems) In order to achieve the above object, the front and rear wheel drive motorcycle of the present invention has two continuously variable belt transmissions connected to the crankshaft ends of the engine mounted on the front lower part of the frame. In addition, a rear drive device and a front drive device each connected to a centrifugal starting clutch and a gear reducer are provided, and the output shaft of the rear drive device is connected to the rear wheel on the opposite side of the continuously variable belt transmission through a rear chain, and the front The output shaft of the part drive device is connected to the constant velocity joint provided on the front fork on the opposite side of the continuously variable belt transmission through the front chain, and the constant velocity joint is connected to the constant velocity joint on the opposite side of the front chain via the fork chain and the front wheel chain. It is connected to the front wheels, and the engine muffler is bent from the bottom to the top at the rear of the engine so that the upper side of the rear chain extends rearward.

(Function) The continuously variable belt transmission and centrifugal starting clutch of the rear drive unit and front drive unit are installed on one side, and the rear chain and front chain are installed on the opposite side, and the muffler is also installed. , the left and right weight balance is better. The muffler is bent from the bottom to the top at the rear of the engine, so it can be placed inside, reducing the width of the car body. Furthermore, the rear drive device and the front drive device can be maintained from one side by removing the side force bar, making maintenance easy. Since the front wheels are driven by a hawk chain and a front wheel chain, the weight can be reduced, and the load distribution between the front and rear wheels can be made appropriate, resulting in light handling and good operability. In this way, the vehicle can run by using the rear drive device and the front drive device with the engine, and also drive the front and rear wheels via a chain or the like.

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

The engine 1 is mounted on the front lower part of the frame 2, and a rear drive device 3 and a front drive device 4 are integrated. The rear drive device 3 includes a continuously variable belt transmission 6, a centrifugal starting clutch 7, and a gear reducer 8 connected to one end of the crankshaft 5, an output shaft 9 protruding to the opposite side, and a rear wheel 10 connected to the rear drive unit 3. 1 liter of chain is connected. The front drive device 4 has a continuously variable belt transmission 6, a centrifugal starting clutch 7, and a gear reducer 8 connected to one end of the crankshaft 5, and has an output shaft 12 protruding to the opposite side and a front fork l3. The front chain 15 is connected to one side of the installed constant velocity joint 14. front hawk 1
3 can be rotated and steered by a handle 16, and a swing arm 18 to which a front wheel 17 is attached can be cushioned by expanding and contracting a cushion unit 19. and,
The constant velocity joint 14 is connected to the front wheel 17 by a hawk chain 20 and a front wheel chain 21 on the opposite side from the front chain 15. In this way, with engine 1, rear wheel 10 and front wheel 17
to drive. The muffler 22 is connected to the exhaust hole facing the lower side of the engine 1, bent from the lower side to the upper side at the rear side of the engine 1, and further extends the upper side of the rear chain I1 to the rear side to form the second muffler 23. It is connected.

(Effects of the Invention) As explained above, since the present invention is configured as described above, the rear chain and the front Since the front chain and muffler are arranged, it is possible to achieve a good weight balance between the left and right sides. By passing the muffler through the rear of the engine, it can be moved inward, narrowing the width from side to side. Furthermore, maintenance of the front drive unit and the rear drive unit can be easily performed by removing the side force bars. The constant velocity joint can be connected to the front wheels via the chain and the front wheel chain, making it lightweight, and the load distribution between the front and rear wheels can be made appropriate, resulting in good handling.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, Fig. 1 is an overall side view, Fig. 2 is a plan view of the same, Fig. 3 is a side view of the front fork portion, Fig. 4 is an exploded front view of the same, Fig. 5 6 is an exploded longitudinal sectional plan view of the engine and front and rear wheel drive devices, and FIG. 6 is a side view of the same. DESCRIPTION OF SYMBOLS 1... Engine, 2... Frame, 3... Rear drive device, 4... Front drive device, 5... Crankshaft,
6... Continuous belt transmission, 7... Centrifugal starting clutch, 8... Gear reducer, 9... Output shaft, IO... Rear wheel, l1... Rear chain, 12...・Output shaft, 13・
...Front Hawk, 14...Constant Velocity Joint, l5...
Front chain, 17...front wheel, 20...hawk chain, 21...front wheel chain, 22...muffler.

Claims (1)

[Claims] Two continuously variable V-belt transmissions are connected to the crankshaft ends of the engine mounted on the front lower part of the frame, and a rear drive device and a front drive device each connected to a centrifugal starting clutch and a gear reducer are installed. The output shaft of the device is connected to the rear wheel on the opposite side of the continuously variable belt transmission by a rear chain, and the output shaft of the front drive device is connected to the constant velocity joint provided in the front fork on the opposite side of the continuously variable belt transmission. On the opposite side of the front chain, connect the constant velocity joint to the front wheel via the hawk chain and front wheel chain, and bend the engine muffler from the bottom to the top at the rear of the engine to connect the upper side of the rear chain. A front and rear wheel drive motorcycle characterized by having wheels extending rearward.