Valve operating apparatus
AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorsShinichi Murata, Noboru Nakamura, Michiyasu Yoshida, Hideki Miyamoto
Life of this patent
Estimating the term…
Abstract
A valve operating apparatus, which transmits the rotation of the crankshaft of an automotive engine to the intake and exhaust valves to open and close the valves, can selectively vary the timing to open and close the valves and ther lifts of the valves. The valve operating apparatus includes a camshaft with low- and high-speed cams and low- and high-speed rocker arms, one of which is fixed to and the other rotatably supported on a rocker shaft. The valves can be opened and closed by the low-speed rocker arm. The other rocker arm and the rocker shaft can be engaged and disengaged by an engaging mechanism that is actuated by an actuating mechanism depending on the operating condition of the engine.
Claims76
A valve operating apparatus for use in an engine, comprising:
- a camshaft with low- and high-speed cams mounted thereon;
- a rocker shaft disposed adjacent to said camshaft and angularly movably mounted on a support;
- a low-speed rocker arm fixed to said rocker shaft and having an end held against the stem of a valve, said low-speed rocker arm being swingable around said rocker shaft by said low-speed cam to actuate the valve;
- a high-speed rocker arm rotatably supported on said rocker shaft parallel to said low-speed rocker arm, said high-speed rocker arm being swingable by said high-speed cam;
- engaging means for selectively engaging and disengaging said rocker shaft and said high-speed rocker arm;
- and
- actuating means for actuating said engaging means depending on an operating condition of the engine, to selectively engage and disengage said rocker shaft and said high-speed rocker arm.
A valve operating apparatus for use in an engine, comprising:
- a camshaft with low- and high-speed cams mounted thereon;
- a rocker shaft disposed adjacent to said camshaft and angularly movably mounted on a support;
- a high-speed rocker arm fixed to said rocker shaft and swingable around said rocker shaft by said high-speed cam;
- a low-speed rocker arm rotatably supported on said rocker shaft parallel to said high-speed rocker arm and having an end held against the stem of a valve, said low-speed rocker arm being swingable by said low-speed cam to actuate the valve;
- engaging means for selectively engaging and disengaging said rocker shaft and said low-speed rocker arm;
- and
- actuating means for actuating said engaging means depending on an operating condition of the engine, to selectively engage and disengage said rocker shaft and said low-speed rocker arm.
A valve operating apparatus for use in an engine, comprising:
- a camshaft with low- and high-speed cams mounted thereon;
- a low-speed rocker arm having an end against the stem of a valve, said low-speed rocker arm being swingable by said low-speed cam to actuate said valve;
- a high-speed rocker arm supported parallel to said low-speed rocker arm, said high-speed rocker arm being swingable by said high-speed cam;
- transmitting means for transmitting the swing of said high-speed rocker arm to said low-speed rocker arm;
- actuating means for actuating said transmitting means in response to an operating status of the engine so as to transmit the swing of said high-speed rocker arm to said low-speed rocker arm;
- and
- first biasing means for normally pressing said high speed rocker arm against said high-speed cam, said first biasing means having a first end and a second end, said first end being disposed against an upper surface of said high-speed rocker arm, said second end being in contact with a stationary member of the engine disposed above said rocker shaft, said stationary member being non-movable with respect to a longitudinal axis of said rocker shaft.
A valve operating apparatus for use in an engine, comprising:
- a camshaft with low- and high-speed cams mounted thereon;
- a low-speed rocker arm having an end against the stem of a valve, said low-speed rocker arm being swingable by said low-speed cam to actuate said valve;
- a high-speed rocker arm supported parallel to said low-speed rocker arm, said high-speed rocker arm being swingable by said high-speed cam, the swing of said high-speed rocker arm being transmitted through a transmitting mechanism to said low-speed rocker arm in response to an operating status of the engine;
- and
- first biasing means for normally pressing said high-speed rocker arm against said high-speed cam, said first biasing means having a first end and a second end, said first end being disposed against an upper surface of said high-speed rocker arm, said second end being in contact with a stationary member of the engine disposed above said rocker shaft, said stationary member being non-movable with respect to a longitudinal axis of said rocker shaft.
Dependencies are inferred from the claim text.