Patent ID: 7318410
Filing Date: 2008-01-15
Classification: F02D

Abstract:
1. A straddle type vehicle having an electronic throttle valve system for adjusting the amount of intake air to an internal combustion engine, the electronic throttle valve system comprising: a throttle valve for adjusting the amount of intake air to the internal combustion engine; an electric motor for actuating the throttle valve; and a control unit for controlling the electric motor, wherein the throttle valve is fixed to a valve shaft; the electric motor, connected to the valve shaft, is located for actuating the throttle valve through the valve shaft; a throttle opening sensor is provided on the valve shaft, the throttle opening sensor being in electrical connection with the control unit and detecting the opening of the throttle valve; a guard mechanism is provided on the valve shaft, the guard mechanism including: a pulley with which a throttle cable is engaged, the throttle cable being coupled to a throttle grip of the straddle type vehicle; and a first rotational member for operating in conjunction with the pulley; a second rotational member is formed on the valve shaft, the second rotational member operating in conjunction with the valve shaft; a relative movement of the first and the second rotational members is limited within a predetermined displacement; and an elastic member is formed between the first and second rotational members and is movable with the first rotational member, wherein the elastic member moves ahead of the second rotational member in an opening direction of the throttle valve, and the elastic member moves with the second rotational member in a closing direction of the throttle valve.