Power transmission system of engine

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.

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.

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.

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.