JPH0331083A - Front and rear-wheel-drive motorcycle - Google Patents

Abstract

PURPOSE:To improve bad running performance with front and rear wheels respectively driven while a differential speed therebetween being absorbed by connecting two continuously variable belt transmissions to one end of a crankshaft in an engine and each transmission to the front and rear wheels respectively through each reduction gear. CONSTITUTION:In an engine 1, a cylinder 2 is brought down to the rear side, while two continuously variable belt transmissions 4, 5 are connected to one end of a crankshaft 3. Here the one continuously variable belt transmission 4 is arranged in the sideward of the cylinder 2 and connected to a reduction gear 8 thorugh a starting centrifugal clutch 7. While the reduction gear 8 is arranged behind the cylinder 2 and connected to a rear wheel through a chain 9. The other continuously variable belt transmission 5 is connected to a reduction gear 11, arranged in the front part upper of the engine 1, through a starting centrifugal circuit 12. Further the reduction gear 11 is connected to a front wheel through a chain 13. In this way, the front and rear wheels are respectively driven while a differential rotary speed therebetween being absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a front and rear wheel drive motorcycle suitable for running on sandy or soft road surfaces.

(Prior art) In general, a motorcycle has an engine connected to a multi-stage south-center transmission through a manual clutch, and further connected to the rear wheel by a cheno, so that the engine drives the rear wheel and the front wheel It is designed to be steered. Then, depending on the running speed, the gears of the multi-gear transmission are selected and switched as appropriate to drive the vehicle.

Alternatively, the output of the transmission shaft may be split via a differential clutch or the like to drive the front wheels as well.

For example, see Japanese Patent Application Laid-Open No. 58-206477.

(Problem A to be Solved by the Invention) Motorcycles in which only the rear wheels are driven by the engine are unable to run if the rear wheels slip, making it impossible to run smoothly on sandy or soft roads. Also, for those that drive the front and rear wheels,
In order to absorb the difference in rotation between the front wheels and the rear wheels due to steering, it is necessary to provide a differential clutch or a differential device. What a difference! When one wheel slips,
Since the lance must be equipped with 9 legs and 18 necks so that the driving force can be transmitted to the wheels on the other side, the device becomes large and expensive to manufacture. In addition, on sandy or soft roads, the resistance of the road surface is large, so in a multi-gear transmission, the middle speed decreases significantly while changing gears, making it difficult to drive smoothly.

In view of the above, this invention connects two continuously variable belt transmissions to an engine, drives the front wheels and the rear wheels with the two continuously variable belt transmissions, and converts the rotation difference between the front and rear wheels into the continuously variable belt transmission. Front and rear wheel drive motorcycles that can be manufactured at low cost, with no need for differentials, small engine and drive parts, and can be manufactured at low cost. The purpose is to obtain.

(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 one end of the crankshaft of an engine whose cylinders are tilted to the rear. One continuously variable belt transmission is placed on the side of the cylinder and connected to the rear wheel via a gear reducer installed on the rear side of the cylinder.
The other continuously variable belt transmission is connected to a gear reducer placed above the front of the engine, and connected to the front wheels.

(Operation) The engine drives the front wheels and rear wheels through two continuously variable belt transmissions. Since it is a continuously variable belt transmission, even if there is a difference in rotation between the front wheels and the rear wheels by steering the front wheels, it can be absorbed, and there is no need to provide a differential. Furthermore, since the front wheels and the rear wheels are each driven by two continuously variable belt transmissions, even if one wheel slips, the other wheel can continue driving. And since the gears are continuously shifted automatically and there is no need to change gears, you can drive smoothly on sandy or soft roads. The engine cylinder is tilted to the rear and fits between the rear gear reducers, so it is compact, requires less space to be mounted on the car body, and can be used on a smaller car body.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

The engine 1 has a cylinder 2 tilted to the rear, and two continuously variable belt transmissions Q4.5 are connected to one end of a crankshaft 3. One case of the engine 1 is a unit case 6 that also accommodates a drive device, and one continuously variable belt transmission 4 is arranged on the side of the cylinder 2, and a gear reduction gear 18 is connected via a centrifugal clutch 7 for one start. Connect to. A gear reducer 8 is located behind the cylinder 2 and is further connected to a rear wheel 10 via a chino 9. The other continuously variable belt speed 1f
i5 is a gear reducer 11 located above and in front of the engine 1.
The gear reducer 11 is further connected to the front wheels 14 via a buen 13. The front fork 15 to which the front wheel 14 is attached is pivoted to a helad vibrator 17 at the end of the vehicle body 16, and a handle 18 is connected to the upper end. The front wheels 14 are then steered by rotating the handle 18 left and right. For this reason, Cheno 13
A constant velocity ball joint 20 is connected to the middle @19. The engine 1 has a cooling fan 2 on the other side of the crankshaft 3.
1, cover the cylinder 2 and the cooling fan 21 with a fan cover 22, and cover the cylinder 2 and the cooling fan 21 for forced air cooling with the air blown by the cooling fan 21.

When the engine 1 is rotated (idling), the two continuously variable belt transmissions 4.5 rotate. Then, when the rotation of the engine 1 is slightly increased, the centrifugal clutch 7 for starting,
12 is connected, the front wheels 14 and the rear wheels 10 are driven, and the vehicle starts running. When the rotation of the engine 1 is further increased, the continuously variable belt transmission 4.5 increases the speed by widening the centrifugal weight and varying the diameter of the belt winding, thereby increasing the traveling speed.

(Effects of the Invention) As explained above, since this invention is configured as described above, the engine can drive the front wheels and the rear wheels respectively using two continuously variable belt transmissions, and absorb the difference in rotation between the front and rear wheels. can. Even if a wheel on one side slips, the wheels on the other side can be driven and the vehicle can continue running, and since it is continuously variable and there is no need to change gears, it can run smoothly on sandy, soft, or weak roads. The engine has a rearward-facing cylinder, and the cylinder is located between the crankshaft and the rear gear reducer, making it more compact, eliminating the need for a differential, making it lighter and cheaper, and making the car body smaller and lighter. In addition, the fan cover can be made of thin material in places where it is unlikely to be hit by flying stones.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal developed plan view of the main parts, Fig. 2 is a side view with the side cover removed, Fig. 3 is a side view of the whole, and Fig. 4 is the same. This is a plan view. DESCRIPTION OF SYMBOLS 1... Engine, 2... Cylinder, 3... Crankshaft, 4... Continuous belt transmission, 5... Continuous belt transmission, 8... Gear reduction gear, 10...・Rear wheel, 11
...Gear reducer, 14...Front wheel.

Claims (1)

[Claims] 1) Two continuously variable belt transmissions are connected to one end of the crankshaft of the engine with the cylinder tilted to the rear, and one continuously variable belt transmission is placed on the side of the cylinder and installed at the rear of the cylinder. A front and rear wheel drive automatic, characterized in that it is connected to the rear wheels via a gear reducer, and the other continuously variable belt transmission is connected to a gear reducer placed above the front of the engine to connect to the front wheels. Two-wheeled vehicle.