Patent ID: 9624840
Date: 2017-04-18
CPC Classifications: F02D

Claim:
1. An intake air quantity control device for an internal combustion engine, comprising: a throttle shaft on which a throttle valve, which is provided in an intake air passage of the internal combustion engine, is arranged so as to be freely rotated and supported; a throttle gear that is fixed to the throttle shaft; a pinion gear that is engaged to the throttle gear; a drive motor that includes a motor shaft, to which the pinion gear is fixed, and is freely rotated at an arbitrary angle; a throttle body that includes a cylinder-shaped hole having a bottom surface and houses the drive motor in the cylinder-shaped hole; and a wave washer that is arranged between the drive motor and the bottom surface of the cylinder-shaped hole, in contact with the bottom surface of the cylinder-shaped hole; wherein an aperture ratio of the throttle valve is regulated by rotating the throttle shaft by the drive motor so as to control intake air of the internal combustion engine, and the throttle body includes a position setting means, composed of a convex portion extending from the bottom surface of the cylinder-shaped hole inside of a diameter of the cylinder-shaped hole, for setting an arrangement position of the wave washer at the bottom surface of the cylinder-shaped hole, and wherein the convex portion is composed of a ring-shaped convex portion having an inner diameter which is larger than an outer diameter of the wave washer, and the arrangement position of the wave washer is set by fitting an outer circumferential surface of the wave washer to an inner circumferential surface of the convex portion.