Abstract: A multiple throttle mechanism comprises a pair of intake manifold blocks separated from each other and each having two or more parallel passages formed therethrough and a wall portion separating thereby the adjacent parallel passages, the parallel passages each being a part of each of the intake manifold passages communicating with respective engine cylinders, and a pair of throttle shafts arranged in an axial direction, each crossing the parallel passages, passing through a through hole formed in the wall portion of the intake manifold block and supported on the intake manifold block, the throttle valves being mounted on the throttle shafts so that the throttle valves are operated simultaneously to control the cross sectional area of each of the parallel passage. The multiple throttle mechanism further comprises air gaps formed between an inner circumference of the through holes and an outer circumference of the shafts to provide an initial air flow.

Abstract: This invention relates to a motor-driven throttle valve assembly which drives a motor according to the amount of depression of the accelerator pedal (9) and thereby controls the opening of the throttle valve (2). The motor-driven throttle valve assembly of this invention has a restricting plate (14), which is located between the throttle valve shaft bearing (16) on the motor side and a gear mechanism (10) transmitting the rotation of the motor to the throttle valve shaft (3), controls the rotation of the throttle valve shaft (3) toward the closed position.

Abstract: An apparatus for adjusting the specific volume of intake air for an engine has an orifice for controlling the amount of air to by-pass a throttle valve. The apparatus is provided with a lattice-shaped heating element which is disposed on the downsteam side of the orifice. Thus, carbon and other substances which may flow back from the engine are trapped and burnt by the heating element.

Abstract: This invention relates to a motor-driven throttle valve assembly which drives a motor according to the amount of depression of the accelerator pedal (9) and thereby controls the opening of the throttle valve (2). The motor-driven throttle valve assembly of this invention has a restricting plate (14), which is located between the throttle valve shaft bearing (16) on the motor side and a gear mechanism (10) transmitting the rotation of the motor to the throttle valve shaft (3), controls the rotation of the throttle valve shaft (3) toward the closed position.