Throttle valve opening control device
AssigneeHitachi, Ltd.
InventorTeruo Takayama
Life of this patent
Estimating the term…
Abstract
A throttle valve opening control device for an internal combustion engine operative to control the opening of a throttle valve by supplying a signal based on the results of feeding of operation parameters of the internal combustion engine into a computer to a throttle valve actuator comprising an initial stage speed reducing gear secured to a DC motor, and a final stage speed reducing gear for driving an output shaft for opening and closing the throttle valve. The initial stage speed reducing gear and the final stage speed reducing gear are located on the same axial line, and a side of the initial stage speed reducing gear opposite the side thereof at which the DC motor is secured is in bearing relation to the final stage speed reducing gear.
Claims8
A device for controlling an opening degree of a throttle valve of an internal combustion engine, comprising:
- a computer for generating electric signals in response to operating parameters of the engine;
- an electric rotary machine driven in response to the electric signals from said computer;
- an initial stage speed reducing gear rotated around its rotational axis by said electric rotary machine and having first gear teeth arranged circumferentially of said initial stage speed reducing gear;
- an intermediate speed reducing gear having a rotational axis thereof offset from the rotational axis of said initial stage speed reducing gear, said intermediate speed reducing gear having arranged circumferentially thereof second gear teeth in mesh with said first gear teeth of said initial stage speed reducing gear, said intermediate speed reducing gear further having arranged circumferentially thereof third gear teeth;
- a final stage speed reducing gear having a rotational axis thereof in coaxial relation to the rotational axis of said initial stage speed reducing gear, said final stage speed reducing gear having arranged circumferentially thereof fourth gear teeth in mesh with said third gear teeth of said intermediate speed reducing gear;
- a shaft extending in coaxial relation to the rotational axes of said initial and final stage speed reducing gears, said shaft having one end thereof secured to an end surface of one of said initial and final stage speed reducing gears, and a bearing section formed in an end surface of the other speed reducing gear opposite to the end surface of said one speed reducing gear for rotatably supporting the other end of said shaft;
- a threaded portion formed in an end of said the other speed reducing gear opposite to the end surface thereof having formed therein said bearing section and extending in concentric relation to the rotational axis of said the other speed reducing gear;
- an output shaft having thereon a threaded portion threadedly engageable with said threaded portion in said the other speed reducing gear for converting the rotational movement of said the other speed reducing gear to the reciprocal movement of said output shaft;
- a case attached in unitary relation to said electric rotary machine for surrounding at least said initial, intermediate and final stage speed reducing gears;
- and
- said throttle valve being operative in response to the reciprocal movement of said output shaft for adjusting flow rate of fluid introduced into the engine.
Dependencies are inferred from the claim text.