Patent ID: 7415346

Claim:
An air-intake device using a butterfly-type throttle valve, comprising: a throttle body including a flow channel; a throttle shaft arranged so as to be rotatable relative to the throttle body; a throttle valve held by the throttle shaft; a sensor unit including a temperature sensor for intake air and a pressure sensor, the sensor unit being mounted on the throttle body; a first attaching unit configured to attach the sensor unit to the throttle body; and a second attaching unit configured to attach the sensor unit to the throttle body, wherein the temperature sensor is disposed at a position upstream of the throttle shaft in the flow channel so as not to contact the throttle valve, an inlet of a guiding path in the flow channel is arranged downstream of a first half part of the throttle valve that is revolved in an upstream direction when the throttle valve is revolved in an opening direction, the guiding path guiding a pressure to the pressure sensor, the first attaching unit is disposed at a position upstream of the first half part, the second attaching unit is disposed at a position downstream of a second half part of the throttle valve that is revolved in a downstream direction when the throttle valve is revolved in the opening direction, the sensor unit includes an attaching portion to which the temperature sensor is attached, the attaching portion projecting into the flow channel along the throttle shaft from an inner peripheral wall of the flow channel, and a length by which the temperature sensor attached to the attaching portion projects from the inner peripheral wall is equal to or less than approximately half of an inside diameter of the flow channel.