Internal-combustion engines – Poppet valve operating mechanism – Rod
Patent
1987-03-05
1989-01-03
Dolinar, Andrew M.
Internal-combustion engines
Poppet valve operating mechanism
Rod
123508, 291567B, 29525, 74579R, 403 28, 403282, F01L 114
Patent
active
047948949
ABSTRACT:
A pivot rod, such as a push rod of the type found included in fuel injector drive trains and engine cylinder valve drive trains, has a mounting shaft with an interior receiving space at at least one end thereof, and a pivot insert formed of a ceramic material that is positioned with a first portion thereof disposed within the receiving space of the mounting shaft and a second portion thereof projecting axially beyond the end of the mounting shaft. To avoid tensile "hoop" stresses from exceeding the maximum tensile principle stress of the ceramic material of the pivot insert, despite the use of an interference fit securement between the pivot insert and the mounting shaft, and despite variations in the degree of diametral interference existing between the internal diameter of the receiving space and the external diameter of the inserted pivot insert portion resulting from manufacturing tolerances, the wall of the pivot shaft taking part in the interference fit securement has its thickness and material composition coordinated with the maximum tensile principle stress so that the wall is plastically deformed by the pivot insert during formation of the interference fit securement. When an axially projecting portion of the pivot insert has an abutment surface in abutting engagement upon an end surface of the mounting shaft, the axial length of the interference fit securement between the pivot insert and mounting shaft is also coordinated to the maximum tensile principle stress of the ceramic material.
REFERENCES:
patent: 2897805 (1959-08-01), Etzler
patent: 3272190 (1966-09-01), Di Matteo, Sr. et al.
patent: 4366785 (1983-01-01), Goloff et al.
patent: 4453505 (1984-06-01), Holtzberg et al.
patent: 4508067 (1985-04-01), Fuhrmann
patent: 4614453 (1986-09-01), Tsuno et al.
patent: 4690617 (1987-09-01), Oda et al.
Cummins Engine Company, Inc.
Dolinar Andrew M.
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