Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1999-04-23
2000-10-24
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
123 9049, F01L 902
Patent
active
061350737
ABSTRACT:
An hydraulic actuator for a spring closed poppet valve is connected to an electrically motivated valve selecting a high or a low fluid pressure source for a chamber in which a plunger reciprocates in a cylindrical body. Poppet valve closing is controlled by restricting fluid flow from the chamber to the low pressure source. Initially, closing flow is through a closing check valve and is gradually cut off by a frusto-conical end of the plunger. Closing flow is then restricted by an orifice bypassed by a snubber check valve during poppet valve opening. The closing check valve, an opening port, and a recuperation check valve open radially through the body. The closing check valve and the opening port communicate with an annular body groove connected to the electrically motivated valve. The recuperation check valve communicates with the plunger chamber beyond the plunger end and opens directly to the high pressure source when the closing kinetic energy of the actuator elements and poppet valve develops an even higher pressure due to the restricted closing flow. Some of this energy is thus recuperated for poppet valve opening.
REFERENCES:
patent: 1930553 (1933-10-01), Hallett
patent: 2101221 (1937-12-01), L'Orange
patent: 2582535 (1952-01-01), Drouot
patent: 2633082 (1953-03-01), McFarland
patent: 2686476 (1954-08-01), Klein et al.
patent: 3699939 (1972-10-01), Eckert et al.
patent: 4000756 (1977-01-01), Ule et al.
patent: 5019119 (1991-05-01), Hare, Sr.
patent: 5070848 (1991-12-01), Mitsuyasu
patent: 5135367 (1992-08-01), Finsterwalder
patent: 5165875 (1992-11-01), Lebret
patent: 5221072 (1993-06-01), Erickson et al.
patent: 5237976 (1993-08-01), Lawrence et al.
patent: 5263441 (1993-11-01), Rembold et al.
patent: 5275136 (1994-01-01), Schechter et al.
patent: 5410994 (1995-05-01), Schechter
patent: 5456221 (1995-10-01), Schechter
patent: 5456222 (1995-10-01), Schechter
patent: 5456223 (1995-10-01), Miller et al.
patent: 5492098 (1996-02-01), Hafner et al.
patent: 5531192 (1996-07-01), Feucht et al.
patent: 5540206 (1996-07-01), Heimberg
patent: 5562070 (1996-10-01), Schechter et al.
patent: 5577468 (1996-11-01), Weber
patent: 6067946 (2000-05-01), Bunker et al.
Feucht Dennis D.
Funke Steven J.
Cain Larry G.
Caterpillar Inc.
Church Stephen J.
Lo Weilun
LandOfFree
Hydraulic check valve recuperation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic check valve recuperation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic check valve recuperation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1953574