JPH05229469A - Belt chamber cooling device for front-and-rear wheel driving motorcycle - Google Patents

Abstract

PURPOSE:To cool sufficiently with a small size blower fan by installing the blower fan to the outer side of a front side starting clutch at the driven side of a front side non-stage belt transmission, and increasing the amount of the cooling air by the blower fan proportinally to the rotation frequency of a belt. CONSTITUTION:While a front side non-stage belt transmission 5 and a front side starting clutch 6 are connected to the crankshaft 4 of an engine 1, a rear side non-stage belt transmission 7 and a rear side starting clutch 8 are connected and housed in a belt chamber 3, a side cover 10 is installed, a blower fan 20 is connected to the outer side of the front side starting clutch 6, and a cooling air is fed into the belt chamber 3 by the blower fan 20, so as to cool the belt chamber 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt chamber cooling device for a front-rear wheel drive motorcycle.

[0002]

2. Description of the Related Art As a motorcycle, there is a front-rear-wheel drive motorcycle in which a front wheel is driven by an engine and a rear wheel is driven by the engine. When steering the front wheels, an overrunning clutch or the like is attached because a rotation difference occurs between the front wheels and the rear wheels. It is convenient to drive the front wheels and the rear wheels via the continuously variable belt transmissions so that the front and rear continuously variable belt transmissions can absorb the difference in rotation between the front wheels and the rear wheels.

Since the continuously variable belt transmission generates heat due to the rotation of the belt, it is necessary to cool it in order to enhance its durability. Some scooters drive the rear wheels via a continuously variable belt transmission, and some have a blower fan attached to the crankshaft end to cool the continuously variable belt transmission.

[0004]

The continuously variable belt transmission is
The speed increases as the rotation increases, the driven side of the continuously variable belt transmission becomes faster than the rotation of the crankshaft, and in order to attach the blower fan to the crankshaft in accordance with the rotation of the belt at high speed,
A large blower fan is required, and the mechanical loss becomes large except at high speeds.

In view of this point, according to the present invention, a blower fan is attached to the outside of the front start clutch on the driven side of the front continuously variable belt transmission, and the amount of cooling air by the blower fan is proportional to the rotational speed of the belt. Further, it is an object of the present invention to obtain a belt chamber cooling device for a front-rear-wheel-drive motorcycle that can be sufficiently cooled by a small blower fan.

[0006]

In order to achieve the above object, a belt chamber cooling device for a front and rear wheel drive motorcycle according to the present invention includes a front continuously variable belt transmission and a front start clutch on a crankshaft of an engine. In addition to connecting, the rear continuously variable belt transmission and the rear start clutch are connected and housed in the belt chamber, the side cover is attached, and the blower fan is connected to the outside of the front start clutch to enter the belt chamber by the blower fan. It is because it cooled by sending cooling air.

[0007]

[Function] The front start clutch is connected to the driven side of the front continuously variable belt transmission, and the blower fan attached to the front start clutch is the rotation speed of the belt of the front continuously variable belt transmission. The number of rotations increases in proportion to and the amount of air blown increases. In this way, it is possible to send the cooling air in proportion to the rotation speed of the belt of the front continuously variable belt transmission, and it is possible to perform sufficient cooling with a small blower fan with less mechanical loss.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. A belt chamber 3 is provided outside the crankcase 2 on one side of the engine 1. A front continuously variable belt transmission 5 and a front start clutch 6 are connected to a crankshaft 4 of the engine 1. A rear continuously variable belt transmission 7 and a rear start clutch 8 are connected to the crankshaft 4. The front continuously variable belt transmission 5 and the rear continuously variable belt transmission 7 are
The centrifugal weight changes the winding diameter of the V-belt as the rotation increases to increase the speed. The front start clutch 6 and the rear start clutch 8 are centrifugal clutches that are connected at a predetermined rotational speed or higher. A side cover 10 is attached to the belt chamber 3 with a gasket 9 interposed therebetween.

The front start clutch 6 includes a gear reducer 11
The front chain 12 via the front chain 1 through the constant velocity joint 13, the secondary chain 14, and the tertiary chain 15.
6 is driven. Also, the rear start clutch 8
The gear reducer 17 and the rear chain 18 are connected to drive the rear wheel 19.

A blower fan 20 is attached to the outside of the front start clutch 6. An intake port 22 having a filter 21 is provided at a position of the side cover 10 facing the blower fan 20. An exhaust port 23 is provided at the rear end of the belt chamber 3.

When the crankshaft 4 of the engine 1 rises to a predetermined rotation, the front start clutch 6 and the rear start clutch 8
Are connected, the front wheels 16 and the rear wheels 19 start to be driven, and the traveling starts. When the rotation of the engine 1 is further increased, in addition to the increase in the rotation of the engine 1, the front continuously variable belt transmission 5 and the rear continuously variable belt transmission 7 are accelerated, and the traveling speed is increased. The blower fan 20 attached to the front start clutch 6 rotates on the driven side of the front continuously variable belt transmission 5 in proportion to the rotation of the belt of the front continuously variable belt transmission 5 to generate the front continuously variable belt. The amount of air blown can be increased in accordance with an increase in the amount of heat generated by the belts of the transmission 5 and the rear continuously variable belt transmission 7.
In addition, the blower fan 20 is attached to the front upper part of the belt chamber 3,
The blown air can flow from the front side to the rear side of the belt chamber 3 and can be discharged from the air outlet 23 at the rear end of the belt chamber 3.

[0012]

As described above, since the present invention is configured as described above, the blower fan 20 produces an air volume proportional to the rotation of the belts of the front continuously variable belt transmission 5 and the rear continuously variable belt transmission 7. Can be sent to the inside of the belt chamber 3, and the small blower fan 20 can cool the mechanical loss to a small extent. Further, since the front start clutch 6 to which the blower fan 20 is attached is attached to the front upper portion of the belt chamber 3, the suction of dust can be reduced, and the cooling air is sequentially blown to the rear end of the belt chamber 3. The exhaust air can be discharged from the exhaust port 23 of the vehicle, and the exhaust air can be prevented from hitting the occupant.

[Brief description of drawings]

FIG. 1 is a developed plan view of an engine in which a drive device portion according to an embodiment of the present invention is longitudinally cut.

FIG. 2 is an enlarged vertical sectional view of a front start clutch portion showing an embodiment of the present invention.

FIG. 3 is a side view of the engine with a side cover removed showing an embodiment of the present invention.

FIG. 4 is an overall side view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Engine 3 Belt Chamber 4 Crankshaft 5 Front Continuously Variable Belt Transmission 6 Front Starting Clutch 7 Rear Continuously Variable Belt Transmission 8 Rear Starting Clutch 9 Gasket 10 Side Cover 20 Blower Fan

Claims (1)

[Claims] 1. A front continuously variable belt transmission and a front starting clutch are connected to a crankshaft of an engine, and a rear continuously variable belt transmission and a rear starting clutch are connected to be housed in a belt chamber, and a side cover is provided. A belt-chamber cooling device for a front-rear-wheel-drive motorcycle, characterized in that a blower fan is attached to the outside of a front start clutch, and cooling air is sent into the belt chamber by the blower fan to cool it.