JPH0331082A - Cooling device for continuously variable belt transmission of front rear-wheel-drive motorcycle - Google Patents

Abstract

PURPOSE:To perform good cooling by driving front and rear wheels, with a rotary speed difference therebetween absorbed, by two continuously variable belt transmissions, connected to a crankshaft in an engine, while circulating cooling air to an internal cavity of a fixed drive pulley in each transmission. CONSTITUTION:Two continuously variable belt transmissions 3, 4 are connected to the one end part of a crankshaft 2 in an engine 1. Each transmission 3, 4 is constituted by fixing a fixed drive pulley 5 in common use to the crankshaft 2 while arranging two movable drive pulleys 6, 7 in both sides of the fixed drive pulley 5. Each centrifugal weight 8, 9 is built in each pulley 6, 7, and by spreading it following an increase of a rotary speed with each pulley 6, 7 approaching the pulley 5, acceleration is performed. Further in the pulley 5, its inside is formed in a cavity 10, and a plurality of fans 11 are radially arranged, while the interior of the cavity 10 communicates with a center hole 12 of the crankshaft 2. In this way, especially a transmitting belt is well cooled.

Description

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

(Prior Art) In general, motorcycles have an engine connected to a multi-stage central transmission via a manual clutch, which is connected to the rear wheel for the first time in history, and the engine drives the rear wheel. , it is designed to be steered by the front wheels. Then, depending on the traveling speed, the gears of the multi-tooth width variable transmission are selected and switched as appropriate to travel.

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.

(Problems to be Solved by the Invention) Motorcycles that drive only the rear wheels with an engine cannot run if the rear wheels slip, and cannot run smoothly on sandy or soft roads. Also, for those that drive the front and rear wheels,
i (In order to absorb the rotation difference between one wheel and the 1U wheel due to the steering of one wheel, it is necessary to install a differential gear or a differential gear. It is necessary to install a non-slip device that allows driving force to be transmitted to the wheels on the side of the vehicle, making the device large-scale and expensive to manufacture.Also, on sandy or soft roads, the resistance of the road is great. In a multi-stage gear width transmission, the gear shift is 11+1.
! This is inconvenient because the vehicle speed decreases significantly while the vehicle is being switched, making it difficult to drive smoothly.

In view of this, this invention uses two continuously variable belt transmissions connected to the engine's crankshaft to drive the front and rear wheels, respectively, to absorb the difference in rotation between the front and rear wheels, making it possible to drive smoothly over sandy or soft roads. In addition to being able to travel, the fixed drive pulleys of two continuously variable belt transmissions can be combined into one and shared, and can be cooled (small and light), and can be produced at low cost. The purpose is to obtain an IA device.

(Means for Solving the Problems) In order to achieve the above object, the continuously variable belt transmission cooling device for a front and rear wheel drive motorcycle of the present invention has two continuously variable belt transmissions installed at one end of the crankshaft of the engine. are connected to drive the front and rear wheels respectively, and several fixed drive pulleys common to the two continuously variable belt transmissions are placed at the end of the crankshaft, and two movable drive pulleys are placed on both sides. , the inside of the fixed pulley is left open (1)] and a plurality of fans are installed, and the holes (2) are connected to the core hole of the crankshaft.

(Function) The front and rear wheels are each driven by two continuously variable belt transmissions, and the continuously variable transmission can absorb the difference in rotation between the front and rear wheels, and does not require a gear change operation, so it can be used on sandy or soft roads. It runs smoothly. Also, since one fixed drive pulley shares two continuously variable belt transmissions, the length of the crankshaft can be shortened and the light B1 can be made more compact. The fixed drive pulley generates frictional heat when the belts of the two continuously variable belt transmissions come into contact with each other on both sides, but as the fixed drive pulley rotates, ventilation is generated by a fan, and the cavity is opened from the inside through the core hole of the crankshaft. Cooling air flows outward, preventing the belt from rising in temperature and making it more durable.

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

Two continuously variable belt transmissions fi3.4 are connected to one end of the crank @2 of the engine 1. The two continuously variable belt transmissions 3 and 4 have a common fixed drive pulley 5 with conical surfaces on both sides fixed to the crankshaft 2, and two movable drive pulleys 6.7 provided on both sides of the common fixed drive pulley 5. The movable drive pulleys 6.7 each have centrifugal weights 8 and 9 built in, and as the rotation slows down, the centrifugal weights 8.9 spread out on the slope, causing the movable drive pulleys 6.7 to slide and connect to the fixed drive pulleys. 5, increase the diameter of the belt around it and increase the speed. The fixed drive pulley 5 has an air conditioner 110 on the inside, and has a plurality of fans 11 arranged radially.
The inside of the cylinder is connected to the core hole 12 of the crank @2. The driven pulley 13 of one of the continuously variable belt transmissions 3 is arranged behind the crank@2, and is connected to a gear reduction gear 15 via a centrifugal clutch 14 for starting, and further via a cheno 16 to a rear wheel 17. Connect to. The driven pulley 18 of the other continuously variable belt transmission 14 is arranged on the upper front side of the crankshaft 2, and is connected to the 17 reduction gear 20 via the centrifugal clamp 19 for starting, and further via the buen 21. 11 wheels connected to 22 J
Ru. The r1 small wheel 23 with the front wheel 22 attached thereto is steered by turning it left and right with a handle 24, and a bow speed ball joint 26 is provided on the intermediate shaft 25 of the buen 21.

When the engine 1 is rotated (idling), the two continuously variable belt transmissions 3.4 rotate. Then, when the rotation of the engine 1 is slightly increased, the centrifugal clutch 14 for starting
．． 19 is connected, the +'+Ff transport 22 and the rear wheels 17 are driven, and the vehicle starts running.

When the rotation of the engine 1 is further increased, the speed of the continuously variable belt transmission 3.4 is increased, and the traveling speed becomes faster.

Only one fixed drive pulley 5 is required for the two continuously variable belt transmissions, and since the crankshaft 2 can be used as a standalone, the fixed drive pulley 5 is cooled as it rotates. , prevent the temperature from rising due to friction and improve the durability of the belt.

(Effects of the Invention) As explained above, the present invention is configured as described above, and uses two continuously variable belt transmissions connected to the crankshaft of the engine to: 1) drive each of the four wheels and the rear wheel; In addition to absorbing the difference in rotation between the front and rear wheels, the continuously variable transmission allows for smooth running on sandy and soft roads. Further, there is no need for an actuating device, only one fixed drive pulley is required for the two continuously variable transmissions, the crankshaft can be shortened, and it is small, lightweight, and inexpensive to manufacture. Fixed drive pulleys generate a lot of frictional heat because the belt hits both sides, but the cavity can be cooled by cooling air, and the belt has good durability.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, Fig. 1 is a vertical developed plan view, Fig. 2 is a side view with the beam case removed, Fig. 3 is an enlarged longitudinal sectional view of the end of the crankshaft, and Fig. 4 is a fixed view. FIG. 5 is a central sectional view of the drive pulley, FIG. 5 is an overall side view, and FIG. 6 is a plan view thereof. 1... 1 engine, 2... Crankshaft, 3... Continuously belt transmission, 4... Continuously variable belt transmission, 5... Fixed drive pulley 6... Movable drive pulley 7.・・・
Movable drive pulley 10... Cavity, 11... Fan, 12... Core hole, 17... Rear wheel, 22... Front wheel.

Claims (1)

[Claims] 1) Two continuously variable belt transmissions are connected to one end of the engine crankshaft to drive the front wheels and the rear wheels, respectively.
A common fixed drive pulley for the two continuously variable belt transmissions is attached to the end of the crankshaft, two movable drive pulleys are arranged on both sides, and the inside of the fixed pulley is hollow and multiple fans are installed. A continuously variable belt transmission cooling device for a front and rear wheel drive motorcycle, characterized in that a cavity is connected to a core hole of a shaft.