Rolling contact rocker arm with reaction member, rocker key and

Details Rolling contact rocker arm with reaction member, rocker key and Rolling contact rocker arm with reaction member, rocker key and

1986-10-16

1988-02-16

Feinberg, Craig R.

Internal-combustion engines

Poppet valve operating mechanism

Rocker

123 9047, 123 9041, F01L 118

Patent

active

047248033

ABSTRACT:
A rocker arm in an internal combustion engine is pivotably supported by a fixed fulcrum retainer with a rocker key operatively positioned therebetween. The rocker arm and fulcrum retainer each have a concave, semi-cylindrical bearing surface and the rocker key has a pair of spaced apart, opposed convex, semi-cylindrical bearing surfaces, the concave, semi-cylindrical bearing surfaces and associate convex, semi-cylindrical bearing surfaces having radii ratios on the order of 1.7:1 to 3:1 and preferably 2:1 whereby to effect substantial rolling contact of these elements relative to each other. In addition, the rocker arm is preferably of U-shaped configuration as defined by a base with side walls depending from opposite sides thereof. A roller follower is operatively and rotatably positioned between the side walls at one end of the rocker arm, with the roller follower having an outer peripheral surface of a diameter whereby the outer peripheral surface is in rolling contact with the base and an associate element of the valve train at this end of the rocker arm. A roller support shaft is operatively associated with the side walls and with the roller follower to loosely retain the roller follower in unit assembly with the rocker arm.

REFERENCES:
patent: 814421 (1906-03-01), Austin
patent: 1497451 (1924-06-01), Kytlica
patent: 1573075 (1926-02-01), Lehmann
patent: 1644750 (1927-10-01), Short
patent: 2943612 (1960-07-01), Middler
patent: 4393820 (1983-07-01), Maki et al.
patent: 4543920 (1985-10-01), Bonvallet

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