Hydraulic valve lifter

Details Hydraulic valve lifter Hydraulic valve lifter

1991-12-03

1992-11-03

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9014, F01L 124

Patent

active

051599074

ABSTRACT:
A hydraulic valve lifter for the mechanism that activates a valve in an internal combustion engine. It comprises two hollow cylinders sealed off from each other with caps over their opposite ends and engaging each other axially by way of a compression spring. The cylinders engage each other not only by way of the compression spring but also by way of a back-up spring opposing the compression spring and made of a shape memory alloy with a compression resistance that is lower, once the As temperature has been attained, than the compression resistance of the compression spring.

REFERENCES:
patent: 4397271 (1983-08-01), Gardner
patent: 4662325 (1987-05-01), Okabe et al.
patent: 4779583 (1988-10-01), Laffter et al.
patent: 4977867 (1990-12-01), Rhoads

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