Internal-combustion engines – Poppet valve operating mechanism – Lubrication
Patent
1988-12-27
1990-01-30
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
Lubrication
123 9041, F01M 106, F01M 910
Patent
active
048966355
ABSTRACT:
A rocker arm is constructed with a fulcrum having at least a partially cylindrical bearing surface and a central passage for receiving therein a pressurized supply or lubricant or oil, the passage being intersected by radial holes or passages connected to the periphery or outer bearing surface of the fulcrum to define a clearance space between the fulcrum and rocker arm surrounding it, for the introduction of a film of oil or lubricant during the non-loading cycle of operation of the cam, a squeeze film effect being provided during the loading operation of the cam by the oil or lubricant being evacuated through a lower or ambient pressure outlet, a thin film remaining to floatingly mount the rocker arm upon the fulcrum, this being accomplished by the introduction of the oil or lubricant under a pressure greater than the forces generated when the cam is in contact on the cam base circle.
REFERENCES:
patent: Re24941 (1961-02-01), Latham
patent: 2338726 (1944-01-01), Leake
patent: 2345822 (1944-04-01), Leake
patent: 2522326 (1950-09-01), Winter
patent: 4245523 (1981-01-01), Wherry
patent: 4515116 (1985-05-01), Hayashi
patent: 4523551 (1985-06-01), Arai et al.
patent: 4662323 (1987-05-01), Moriya
Pieprzak John M.
Willermet Pierre A.
Ford Motor Company
Lo Weilun
McCollum Robert E.
Myhre Charles J.
Sadler Clifford L.
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