| 摘要 |
A fluid-operated internal combustion engine cylinder cutout device selectively operable to function as a rigid extension of a valve pushrod, as a deactivating means between the pushrod and its respective valve, or as a fluid jack means for holding the valve associated with a pushrod open while the operation of the pushrod is unimpeded. The device enables normal operation of an engine cylinder intake or exhaust valve by its pushrod; selective deactivation of the intake valve operation by uncoupling the pushrod and its respective valve; and sustained opening of the exhaust valve, the valves being associated with an engine cylinder desired to be cut out from engine operation. Engine oil pressure may be used as the operating fluid of the cutout device, which is constituted of an outer cylinder; an inner hollow piston slidable in the cylinder and having a pair of axially aligned, fluid isolated chambers; and a small piston in one of the chambers. The pushrod end is slidably received in the opposite chamber, and fluid pressure lines are connected to fluid ports in the outer cylinder, the fluid ports being in communication with the chambers of the hollow piston. A control means, not disclosed, enables selective operation of the cutout device to enable an inlet valve to be in effect disconnected from the operating influence of its pushrod; to enable fluid actuation of the device whereby it forms a rigid extension of the pushrod for normal operation of an inlet or exhaust valve; and to enable a different fluid actuation of the device whereby it operates as an extensible ram or jack for holding an exhaust valve open while the pushrod operation is unimpeded.
|
