Variable friction roller tappets

Details Variable friction roller tappets Variable friction roller tappets

1988-10-05

1989-07-11

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 905, F01L 114

Patent

active

048461210

ABSTRACT:
A tappet assembly for use in the valve train of an automotive type internal combustion engine has a roller at one end adapted to be engaged by the cam lobe of a camshaft for that engine. A spring biased piston is incorporated in the assembly for movement into frictional engagement with the roller at low engine speeds to dampen out vibrational or shaking forces present in the engine at this speed level by increasing the resistance to rotation of the roller. At higher engine speeds, the piston is moved progressively away from frictional contact with the roller by engine oil galley oil pressure, which increases with engine speed, to a point where the piston is completely removed from engagement with the roller and the roller is permitted to freely rotate at a point when the engine vibration or shaking forces are no longer present.

REFERENCES:
patent: 3108580 (1963-10-01), Crane
patent: 4607599 (1986-08-01), Buente et al.
patent: 4747376 (1988-05-01), Speil et al.
patent: 4771741 (1988-09-01), Leer
patent: 4793295 (1988-12-01), Downing

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