Temperature-sensitive variation of the compression ratio in pist

Details Temperature-sensitive variation of the compression ratio in pist Temperature-sensitive variation of the compression ratio in pist

1989-03-03

1990-12-25

Kwon, John T.

Expansible chamber devices

Selective clearance control

92 82, 92110, 92143, 123 48B, 123 78B, F01B 3114

Patent

active

049794272

ABSTRACT:
The invention relates to a piston having a variable compression height and two control chambers connected to each other through a hydraulic system. In order to achieve better cold-start and warm-up behavior, an oil discharge bore from the upper control chamber into the crankcase is closed by a control slide valve in the cold operating state of the engine. The blockage of the oil discharge produces a great compression height and therefore high compression. The control slide valve is connected to an expansible element which maintains it in this closed position when the engine is cold. As the engine warms up, the expansible element, due to its thermal expansion, pushes the control slide valve out of its closed position, so that the discharge of oil can occur progressively more unthrottled with rising temperature. In the warm operating state of the engine the control slide valve clears the oil discharge duct completely, and an unobstructed discharge of oil is ensured.

REFERENCES:
patent: 3303831 (1967-02-01), Sherman
patent: 3418982 (1968-12-01), Waugaman
patent: 3450113 (1969-06-01), Bachle
patent: 3527264 (1970-09-01), Bachle
patent: 3656412 (1972-04-01), Wilson
patent: 4016841 (1977-04-01), Karaba et al.
patent: 4031868 (1977-06-01), Karaba et al.
patent: 4079707 (1978-03-01), Karaba et al.
patent: 4469055 (1984-09-01), Caswell
patent: 4784093 (1988-11-01), Pfeffer et al.
patent: 4809650 (1989-03-01), Arai et al.
patent: 4864977 (1989-09-01), Hasegawa
patent: 4934347 (1990-06-01), Suga et al.

Affiliated with

Also associated with

Rating

Temperature-sensitive variation of the compression ratio in pist does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Temperature-sensitive variation of the compression ratio in pist, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature-sensitive variation of the compression ratio in pist will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1156738