Hydraulically actuated valve train for an internal combustion engine
A hydraulically actuated valve train is described for an internal combustion engine comprising a poppet valve supported for reciprocation for controlling the communication of a port with a chamber of the engine, a fluid actuated piston associated with the poppet valve for operating the poppet valve, and a remotely positioned actuator device for supplying fluid under pressure to the fluid piston. The actuator device comprises a housing defining a fluid chamber and having a bore, means for delivering fluid under pressure to the chamber, the bore communicating with the fluid piston for delivering fluid thereto. A plunger is supported in the bore for pressurizing the fluid in the bore, valve means comprising a sleeve slidably supported on the plunger and within the bore for selectively communicating a chamber formed in the bore above the valve sleeve and the plunger with the fluid chamber and for isolating the bore from the fluid chamber. A means for cyclically and sequentially closing the valve for isolating the bore from the fluid chamber and for moving the plunger in the bore for pressurizing the fluid piston and actuating the poppet valve, comprises a first relatively light spring means interposed between the plunger and the valve sleeve for urging the valve sleeve toward a closed position. A second relatively heavier valve spring means acts on the plunger for urging the plunger into engagement with an actuating member for effecting reciprocation of the plunger and the valve sleeve.
- Assignee:
- NOV; NOV-85-026063; EDB-86-183203
- Patent Number(s):
- US 4612883
- OSTI ID:
- 5147178
- Resource Relation:
- Patent File Date: Filed date 18 Apr 1985
- Country of Publication:
- United States
- Language:
- English
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