Valve lifter

Details Valve lifter Valve lifter

1991-11-21

1992-07-07

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Lubrication

123 905, F01M 910

Patent

active

051273748

ABSTRACT:
An improved pin for supporting a roller cam follower for use in an internal combustion engine block used in a high speed motor vehicle having open-ended cylindrical bores in which valve lifters reciprocate, a cam shaft with cams that reciprocate the lifters, and an engine block oil passage communicating between adjacent cylindrical bores intermediate the ends of the bores. The improved pin is cylindrical in shape and secured against rotation in two pin-receiving bores. The roller cam follower is rotatably supported on the pin. A primary oil passage for communicating with the engine block oil passage to facilitate the flow of oil between the bores is provided. The primary oil passage is displaced longitudinally from the pin and roller cam follower. A lubrication oil passage is located within the pin and has an inlet opening facing predominantly toward the primary oil passage and which is located in a portion of the pin that is on one of the pin-receiving bores of the body. The lubrication oil passage also has an outlet opening facing predominantly toward the primary oil passage and is displaced longitudinally from the inlet opening. The outlet is located in a cylindrical surface of the pin in a portion of the pin that is surrounded by the roller. A secondary oil passage extends in fluid communication between the primary oil passage and the inlet opening of the lubrication oil passage.

REFERENCES:
patent: 4361120 (1982-11-01), Kueny
patent: 4708102 (1987-11-01), Schmid
patent: 4793295 (1988-12-01), Downing
patent: 4876994 (1989-10-01), Speil et al.
patent: 5022356 (1991-06-01), Morel, Jr. et al.

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