Straddle type vehicle having an electronic throttle valve system
First Claim
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, whereinthe elastic member moves ahead of the second rotational member in an opening direction of the throttle valve, andthe elastic member moves with the second rotational member in a closing direction of the throttle valve.
1 Assignment
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Accused Products
Abstract
An electronic throttle valve system more suitable for use in straddle type vehicles. A straddle type vehicle has an electronic throttle valve system for adjusting the amount of intake air to an internal combustion engine. The electronic throttle valve system includes a throttle valve, an electric motor and a control unit. A guard mechanism is provided on a valve shaft of the throttle valve. The guard mechanism includes a pulley with which the throttle cable is engaged and a lever pulley which rotates in conjunction with the opening of the pulley. A cushion spring is provided on an edge face of a notched portion of the lever pulley, the edge face generally coming into contact with a protrusion that extends from the valve shaft of the throttle valve.
22 Citations
9 Claims
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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:
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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.
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2. 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:
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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, wherein the first rotational member is a lever pulley for operating in conjunction with the pulley;
a notched portion is formed in the lever pulley, the notched portion being capable of contacting a protrusion that extends from the valve shaft of the throttle valve;
the protrusion is the second rotational member;
the notched portion opens in a substantially fan shape having an angle wider than an angle corresponding to the width of the protrusion;
the lever pulley has a configuration such that as the lever pulley rotates, an edge face of the notched portion, which opens in the substantially fan shape, generally comes into contact with the protrusion; and
the elastic member is provided on the edge face generally coming into contact with the protrusion. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification