Back to results
US 4,576,128 AGranted
Valve operation stopping means for multi-cylinder engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorNagahiro Kenichi
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorNagahiro Kenichi
Estimating the term…
A valve operation stopping mechanism for multi-cylinder internal combustion engine to cause selected cylinders to be inoperative under low load conditions for economy. A drive rocker arm is normally pivoted by a cam for each selected cylinder, a driven rocker arm is engaged with the suction or exhaust valve, a rocker shaft pivotably supports the drive rocker arm and the driven rocker arm so as to permit relative angular displacement, a synchro is provided in the driven rocker arm so as to slidably engage the drive rocker arm, and a timing piston is provided in the drive rocker arm opposite the synchro pin to control the position of the synchro pin by the action of hydraulic pressure. An arrangement of the timing pistons and hydraulic circuit causes the intake valve to always be rendered inoperative before the exhaust valve of a selected cylinder.
In a valve operating mechanism for multi-cylinder internal combustion engine including a cam shaft with a plurality of cams formed integrally with said cam shaft at positions corresponding to suction valves and exhaust valves for each cylinder, a valve operation stopping device comprising a drive rocker arm engaging one of said cams, a driven rocker arm engaging one of either the suction valves or the exhaust valves, said drive rocker arm and said driven rocker arm being pivotably supported on the same axis to permit relative angular displacement, a synchro pin slidably mounted in said driven rocker arm to engage with said drive rocker arm to prevent said relative axial displacement, means biasing said synchro pin toward engagement with said drive rocker arm, and a timing piston provided in said drive rocker arm at a position corresponding to said synchro pin and acting to urge said synchro pin toward said driven rocker arm by hydraulic pressure to release connection between said drive rocker arm and said driven rocker arm.
In a multi-cylinder internal combustion engine including a cam shaft adapted to be rotated synchronously with rotation of the engine crankshaft, a plurality of cams formed integrally with said cam shaft at positions corresponding to suction valves and exhaust valves for each cylinder, a rocker shaft arranged in parallel relation with said cam shaft, and a plurality of rocker arms pivotably supported to said rocker shaft and adapted to be rocked in contact with said cams for each cylinder and operate said suction and exhaust valves, a valve operation stopping device comprising a separate drive rocker arm engaging the suction and exhaust cams associated with a specific cylinder, a separate driven rocker arm engaging said suction valve and said exhaust valve of that cylinder, each said drive rocker arm and said driven rocker arm being pivotably supported on said rocker shaft to allow relative angular displacement, a synchro pin provided in each said driven rocker arm to slidably engage with the associated said driven rocker arm, each said synchro pin being axially slidable and biased by a spring in a direction to engage said drive rocker arm, and a timing piston provided in said drive rocker arm at a position corresponding to said synchro pin and acting to urge said synchro pin toward said driven rocker arm by hydraulic pressure to release connection between said drive rocker arm and said driven rocker arm.
In a valve operating mechanism for a multi-cylinder internal combustion engine having a cam shaft with cams for actuating each of the exhaust and suction valves, at least one cylinder having exhaust and suction valve operation stopping devices, comprising for each valve, a drive rocker arm and a driven rocker arm mounted for pivotal rocking on the same axis together for valve operation and separately for valve operation stopping, said drive rocker arm engaging a said cam and said driven rocker arm engaging a said valve, and means for selective connecting and disconnecting said drive rocker arm and driven rocker arm including a timing piston slidably mounted on one rocker arm and a synchro pin slidably mounted on the other rocker arm in juxtaposed positions for interengagement and sliding on an axis parallel to said axis of pivotal rocking of said rocker arms, said synchro pin selectively engageable with both arms for causing simultaneous pivoting of said arms, and means for selectively causing sliding movement of said timing piston relation to the angular positions of said rocker arms for inturn causing engagement and disengagement of said synchro pin between the two rocker arms.
Dependencies are inferred from the claim text.