Aisan Kogyo Kabushiki Kaisha

Toru Sakurai

Tsutomu Nishitani

Sunao Kitamura

Takashi Tsuge

Atsushi Tanaka

Masanobu Kondo

Yukihiro Shibata

An electronically-controlled throttle valve control device may include a coil spring that is engaged with a throttle body and a rotating body to bias a throttle valve in a fully opening direction and a fully closing direction, a spring guide that is provided to the rotating body and is capable of supporting the coil spring from inside, and an opener member that is provided to the rotating body and is biased by the coil spring in the fully opening direction or the fully closing direction. The coil spring includes a first coiled portion that is capable of biasing the throttle valve in a first direction, a second coiled portion that is capable of biasing the throttle valve in a second direction, and an intermediate coiled portion that is positioned between the first and second coiled portions. The coil spring is formed such that a central axis of the intermediate coiled portion is displaced radially outwardly relative to a central axis of the first coiled portion.

Throttle valve control device

An intake valve device includes a throttle body defining a bore for the flow of intake air. A throttle shaft is rotatably mounted to the throttle body. A slit is formed in the throttle shaft in a diametrical direction and extends throughout the diameter of the throttle shaft. The slit has opposing end walls along the rotational axis of the throttle shaft. A throttle valve is inserted into the slit of the throttle shaft and fixed in position relative to the throttle shaft. Possible intake air leakage channels are defined between the outer periphery of the throttle valve and the end walls of the slit. At least one restriction portion is formed on the throttle valve so as to extend into at least one of the possible leakage channels in order to narrow the possible leakage channel and reduce or inhibit the leakage of intake air.

Intake valve device

A throttle device with a throttle body and first and second supports supporting a motor for controlling the opening position of the throttle of a valve. The first and second supports support the motor from both sides of the motor in the longitudinal direction. At least one of the first and second supports may also elastically support the motor, and may be a metallic leaf spring disposed within the throttle body.

Throttle devices having motors supported by elastic, metallic support members

A throttle gear is fastened to a throttle shaft . A relief lever is pivotally mounted on the throttle shaft . A return spring urges the relief lever in a valve closing direction with respect to a throttle body . The throttle body contacts the relief lever at a second contact position A when the relief lever pivots to a predetermined pivot position B in the valve closing direction. A relief spring urges the throttle gear in a valve opening direction with respect to the relief lever . The relief lever contacts the throttle gear at a first contact position B when the throttle gear pivots to the predetermined pivot position B in the valve opening direction. The first and second contact positions B, A are located within or to one side of a plane P that is perpendicular to the rotational axis L of the throttle shaft . Plane P preferably includes a third position C at which the biasing force of the return spring acts on the relief lever

Throttles

A throttle control apparatus for an internal combustion engine in which wear particles due to sliding between components and vibration wear particles produced between components by engine vibrations are prevented from entering the area between a brush of a throttle sensor and a sensor substrate to prevent the occurrence of a contact failure between the brush and the substrate, thereby making it possible to detect an accurate throttle opening. A brush of a sensor unit is secured to an outer end portion of a throttle shaft projecting from a cover, and the sensor unit is accommodated in a sensor chamber formed outside the cover. A gear chamber for accommodating gears and the sensor chamber are isolated from each other by a dust seal. Therefore, wear particles will not enter the sensor chamber and accumulate in the area between the brush and the sensor substrate to cause a contact failure.

Growing community of inventors

Obu, Japan

Toru Sakurai