Throttle valve control device

摘要

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.