Power transmission system of engine
View Patent ↗The power transmission system of an engine is mounted on the all-terrain vehicle and has a crankshaft driven by the engine and the crankshaft is arranged in a direction of width of a vehicle body. A sub-shaft is arranged parallel to the crankshaft and the rotation of the crankshaft is transmitted to the sub-shaft via gears. A primary shaft is concentrically mounted on the sub-shaft and is provided with a primary pulley having a variable groove width. A secondary pulley coupled to the primary pulley via a V-belt and having a variable groove width. The rotation of the crankshaft is transmitted to the primary shaft via the sub-shaft arranged parallel to the crankshaft.
1. A power transmission system of an engine for transmitting engine power to a driving wheel, said power transmission system comprising:
a crankshaft driven by the engine, said crankshaft being arranged in a vehicle body in a widthwise direction of the vehicle body;
a sub-shaft which is arranged parallel to said crankshaft and non-concentric with the crankshaft and to which the rotation of said crankshaft is transmitted via a rotary transmission member; and
a belt type continuously variable transmission including a primary shaft and a secondary shaft, said primary shaft being arranged concentrically with said sub-shaft and provided with a primary pulley having a variable groove width; said secondary shaft provided with a secondary pulley coupled to said primary pulley via a belt and having a variable groove width,
wherein the rotation of said crankshaft is transmitted to said primary shaft via said sub-shaft, and said crankshaft is arranged parallel to said primary shaft, and
a clutch member is arranged between said sub-shaft and said primary shaft and, relative to a lineal frame of reference extending in common with a rotation axis of said sub-shaft, said clutch member is disposed along said sub-shaft between said primary pulley and a drive engagement location of said rotary transmission member with said sub-shaft.
2. The power transmission system of an engine according to claim 1 , wherein said clutch member is a centrifugal clutch that has a casing that is secured to an interior end of said primary shaft and extends around and past in overlapping fashion an opposing, interior end of said sub-shaft.
3. The power transmission system of an engine according to claim 1 , wherein said clutch transmits and interrupts the rotation of said sub-shaft to said primary shaft.
4. The power transmission system of an engine according to claim 1 , comprising:
a crankcase that mounts said crankshaft, and
wherein said clutch member is arranged in said crankcase.
5. The power transmission system of an engine according to claim 1 , wherein said crankshaft is arranged in front of said primary shaft in a longitudinal direction of the vehicle body.
6. The power transmission system of an engine according to claim 1 , wherein said secondary shaft is arranged behind said primary shaft in a longitudinal direction of the vehicle body.
7. The power transmission system of an engine according to claim 1 , wherein said rotary transmission member is a pair of gears mounted on said sub-shaft and said crankshaft.
8. The power transmission system of an engine according to claim 1 , wherein said crankshaft is mounted with a generator.
9. The power transmission system of an engine according to claim 8 , wherein said sub-shaft is mounted with a recoil starter.
10. The power transmission system of an engine according to claim 1 , comprising:
a generator; and
a recoil starter;
wherein said generator and said recoil starter are mounted on different axes among said crankshaft and said sub-shaft.
11. The power transmission system of an engine according to claim 10 , wherein said crankshaft is mounted with a generator.
12. The power transmission system of an engine according to claim 10 , wherein said sub-shaft is mounted with a recoil starter.
13. A power transmission system of an engine for transmitting engine power to a driving wheel, said power transmission system comprising:
a crankshaft driven by the engine, said crankshaft being arranged in a vehicle body in a widthwise direction of the vehicle body;
a sub-shaft which is arranged parallel to said crankshaft and non-concentric with the crankshaft and to which the rotation of said crankshaft is transmitted via a rotary transmission member; and
a belt type continuously variable transmission including a primary shaft and a secondary shaft, said primary shaft being arranged concentrically with said sub-shaft and provided with a primary pulley having a variable groove width; said secondary shaft provided with a secondary pulley coupled to said primary pulley via a belt and having a variable groove width, wherein the rotation of said crankshaft is transmitted to said primary shaft via said sub-shaft, and said crankshaft is arranged parallel to said primary shaft,
a clutch member is arranged between said sub-shaft and said primary shaft, and wherein said clutch member is a centrifugal clutch.
14. A power transmission system of an engine for transmitting engine power to a driving wheel, said power transmission system comprising:
a crankshaft driven by the engine, said crankshaft being arranged in a vehicle body in a widthwise direction of the vehicle body;
a sub-shaft which is arranged parallel to said crankshaft and non-concentric with the crankshaft and to which the rotation of said crankshaft is transmitted via a rotary transmission member; and
a belt type continuously variable transmission including a primary shaft and a secondary shaft, said primary shaft being arranged concentrically with said sub-shaft and provided with a primary pulley having a variable groove width; said secondary shaft provided with a secondary pulley coupled to said primary pulley via a belt and having a variable groove width,
wherein the rotation of said crankshaft is transmitted to said primary shaft via said sub-shaft, and said crankshaft is arranged parallel to said primary shaft,
a clutch member is arranged between said sub-shaft and said primary shaft and, relative to a lineal frame of reference extending in common with a rotation axis of said sub-shaft, said clutch member is disposed along said sub-shaft between said primary pulley and a drive engagement location of said rotary transmission member with said sub-shaft, and
said sub-shaft is mounted with a recoil starter.
15. The power transmission system of an engine according to claim 14 , wherein said clutch transmits and interrupts the rotation of said sub-shaft to said primary shaft.
16. The power transmission system of an engine according to claim 14 , wherein, relative to said lineal frame of reference extending in common with a rotation axis of said sub-shaft, there is lacking an overlap between said sub-shaft and said primary shaft.
17. A power transmission system of an engine for transmitting engine power to a driving wheel, said power transmission system comprising:
a crankshaft driven by the engine, said crankshaft being arranged in a vehicle body in a widthwise direction of the vehicle body;
a sub-shaft which is arranged parallel to said crankshaft and non-concentric with the crankshaft and to which the rotation of said crankshaft is transmitted via a rotary transmission member; and
a belt type continuously variable transmission including a primary shaft and a secondary shaft, said primary shaft being arranged concentrically with said sub-shaft and provided with a primary pulley having a variable groove width; said secondary shaft provided with a secondary pulley coupled to said primary pulley via a belt and having a variable groove width, wherein the rotation of said crankshaft is transmitted to said primary shaft via said sub-shaft, and said crankshaft is arranged parallel to said primary shaft,
a clutch member is arranged between said sub-shaft and said primary shaft, and wherein, relative to a lineal frame of reference extending in common with a rotation axis of said sub-shaft, there is lacking an overlap between said sub-shaft and said primary shaft.
18. A power transmission system of an engine for transmitting engine power to a driving wheel, said power transmission system comprising:
a crankshaft driven by the engine, said crankshaft being arranged in a vehicle body in a widthwise direction of the vehicle body;
a sub-shaft which is arranged parallel to said crankshaft and non-concentric with the crankshaft and to which the rotation of said crankshaft is transmitted via a rotary transmission member; and
a belt type continuously variable transmission including a primary shaft and a secondary shaft, said primary shaft being arranged concentrically with said sub-shaft and provided with a primary pulley having a variable groove width; said secondary shaft provided with a secondary pulley coupled to said primary pulley via a belt and having a variable groove width,
wherein the rotation of said crankshaft is transmitted to said primary shaft via said sub-shaft, and said crankshaft is arranged parallel to said primary shaft,
a clutch member is arranged between said sub-shaft and said primary shaft, and
said sub-shaft is mounted with a recoil starter, and
wherein said clutch member is a centrifugal clutch that has a casing that is secured to an interior end of said primary shaft and extends around and past in overlapping fashion an opposing, interior end of said sub-shaft.