Electronic air throttle body for non-contact sensor

The invention relates to an electronic air throttle body for a non-contact sensor, which belongs to air throttle assemblies of automobile engine air inlet systems. The air throttle body is provided with a direct current motor, a motor gear is meshed with a middle gear, and the middle gear is meshed with a sector gear arranged on an air throttle shaft; a rotating position of the sector gear on the body is provided with two protuberant limit stops; one end of a torsion spring is fixed on the body, while the other end is fixed on the sector gear; one end of another torsion spring positioned between the sector gear and a gear blocking cover is fixed on the sector gear, while the other end is fixed on the gear blocking cover; the gear blocking cover is clamped on a hook of the sector gear; and when the air throttle shaft rotates positively to a full open position, a sector gear stop dog resists against one limit dog of the body; and when the air throttle shaft rotates reversely to a low idle speed position, the sector gear stop dog resists against the other limit dog of the body. When the direct current motor has failure and cannot work normally, valves of the air throttle are always in a high idle speed state under the actions of the two torsion springs so as to increase the safety of an engine system.