Patent ID: 6257081
Filing Date: 2001-07-10
Classification: B60W,B60Y,B62K,B62M,F16H,Y10T

Abstract:
A semi-automatic transmission system for a straddle type vehicle which comprises a body frame supported by front and rear wheels, a seat supported above said frame and a power unit supported by said frame below said seat, said transmission system comprised in said power unit and includes:a switch with an up-shift button and a downshift button mounted on a steering bar wherein, in operation, depression of said up-shift button generates an input UO and depression of said downshift button generates an input DO;a friction-type transmission clutch mounted on one end of a main shaft of a transmission;the transmission having at least first and second speed gear trains associated with the main shaft, wherein a shifter is mounted to shift from one of the first and second speed gear trains associated with the main shaft to another of the first and second speed gear trains associated with the main shaft;a shift actuator in communication with said shifter;a clutch actuator in communication with said transmission clutch;wherein, in operation, when one of said inputs UO and DO is generated, said clutch actuator and said shift actuator are activated, wherein said transmission clutch is disengaged when the up-shift button or the downshift button is depressed and shifting is accomplished by said shifter; said shifter being moved and positioned to one of said first and second gear trains associated with said main shaft based on the generated input.