Abstract: An apparatus for controlling a throttle valve electronically in an internal combustion engine comprises a throttle valve with a rotation axis disposed in an intake air passage of an internal combustion engine, and an actuator with two ends and a central body disposed in parallel with the rotation axis of the throttle valve and extending back part way along the length of the throttle valve, and a casing formed around the throttle valve and the actuator, but not covering the central body of the actuator to thereby allow a mold for the casing to be slidably removed in a direction at approximately a right angle to the rotation axis.

Abstract: An apparatus for controlling a throttle valve electronically in an internal combustion engine. The actuator 2 is supported on a body 1A by fixing a base plate 7 to a flange 1B of the body 1A with a bolt 6, and an elastic member 9 is fixed at an outer surface of a cylindrical projection 2C which is positioned on one end 2B of the body of the actuator 2. The inner surface of a case 1C of the body 1A covers cylindrical projection 2C. One end 2B of the body of the actuator 2, opposite the actuator output end, is thus supported by the body 1A via elastic member 9. Therefore, it is not necessary to provide a heavy wall thickness of the flange by which the actuator 2 is supported or of the body of the actuator, and increase the strength of the internal structure of the actuator, and increase weight, size, and cost of the actuator.

Abstract: A throttle valve device for use in an internal combustion engine comprises a valve shaft extending across an air induction passage of the engine. A valve plate is fixed to the valve shaft to rotate therewith in the air induction passage. An electric actuator is connected to one end of the valve shaft to rotate the valve shaft with the aid of electric power. A biasing cam structure is incorporated with the valve shaft to bias the valve place toward a predetermined intermediate open position. The biasing cam structure comprises a cam plate which is secured to the other end of the valve shaft to rotate therewith and has a generally V-shaped cam edge; a loading lever which has a base end pivotally connected to a fixed portion; a follower member which is connected to a leading end of the loading lever and slidably engaged with the V-shaped cam edge; and a biasing member which biases the loading lever in a direction to press the follower member against the V-shaped cam edge.

Abstract: A device for returning a reciprocating mechanism to a predetermined intermediate position of reciprocating motion, comprises a reciprocating link movable in accordance with a predetermined reciprocating motion, a pair of positioning members provided at both sides of the predetermined intermediate position of reciprocating motion, a pair of movable blocks, and a single resilient member interconnecting the movable blocks. The positioning members is adapted to position the movable blocks by abutting the movable blocks against the respective positioning members via a biasing force created by the single resilient member. The movable blocks is adapted to return the reciprocating link to its predetermined intermediate position by abutment of the reciprocating link on both the movable blocks, for restricting a reciprocating motion of the reciprocating link via the biasing force created by the single resilient member.

Abstract: In a valve actuator arrangement for an internal combustion engine, a valve structure having a valve body and a rotary valve axle is provided, an electric motor structure having a generally disc shaped body fixed on one end of said valve axle so as to be integrally pivoted with the valve axle is provided, a permanent magnet fixed on the disc-shaped body is provided, a fixing member fixed on the one end of the valve axle is provided, and a pair of windings to form a pair of coils whose winding directions are mutually opposite to each other are wound around the fixing member so that a direction of a magnetic flux developed between each of the pair of windings and the permanent magnet is parallel to the valve axle.