Throttle valve control device
AssigneeAisan Kogyo Kabushiki Kaisha
InventorYoshiki Ito
Life of this patent
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Abstract
A throttle valve control device provided with a throttle valve 3 formed in an elliptic shape such that a major axis is a center line 3c connecting mounting holes 3a and 3b for fixing the valve 3 to a throttle shaft 2. A clearance A is provided between an edge of the elliptic valve 3 in a minor axis and an inner wall of a throttle bore 1b configuring an intake passage, while the minimum open area needed for idle engine operation is provided. Even if deposits are accumulated in the bore 1b in the vicinity of the throttle shaft 2 at the idle operation, the throttle valve 3 further rotated in a reverse rotating direction at throttle valve non-control time can scrape off the deposits at a smaller rotational torque as compared with in the vicinity of the edge 3d of the valve 3.
Claims13
A throttle valve control device provided with a throttle valve for opening and closing an intake passage of an engine and a throttle shaft extending across the intake passage, the throttle valve being fixed to the throttle shaft and rotated in a normal direction from a full closed position to a full open position and in a reverse direction from the full open position to the full closed position to control output of the engine, and further rotated by a predetermined angle in the reverse direction from the full closed position to a predetermined open position at stop of the engine,
- wherein the throttle valve is formed in an elliptic shape of which a major axis is a center line connecting a plurality of mounting holes for fixing the throttle valve to the throttle shaft.
A throttle valve for opening and closing an intake passage of an engine, the throttle valve having an elliptic outer shape of which a major axis corresponds to a center line connecting a plurality of mounting holes for fixing the throttle valve to a throttle shaft.
Dependencies are inferred from the claim text.