Cylindrical tappet

Details Cylindrical tappet Cylindrical tappet

1983-10-25

1988-04-26

Smith, Gary L.

Machine element or mechanism

Elements

Cams

123 9048, F16H 5306

Patent

active

047396750

ABSTRACT:
An improved cylindrical tappet for transmitting motion between a camshaft and a valve of an internal combustion engine. The tappet construction affords improved performance by permitting higher lift rates than possible with conventional tappet designs. In addition, cam and tappet face wear and cam walk are minimized due to the construction. The tappet consists of a body portion that is slidably supported in a bore of the engine adjacent to the cam lobe. The body portion has a pocket that is adapted to receive one end of a push rod for actuating the valve upon reciprocation of the tappet body portion. A follower portion is pivotally supported by the body portion about an axis that extends normally to the axis of rotation of the associated cam. The follower portion has a curved cylinder surface which engages the cam lobe and which has a substantially larger radius of curvature than the bore in which the tappet is supported. The pivotal support of the follower portion permits the follower face to maintain full face-to-face contact with the cam lobe.

REFERENCES:
patent: 1461560 (1923-07-01), Rich
patent: 2445493 (1948-07-01), Priest
patent: 2735313 (1956-02-01), Dickson
patent: 2829540 (1952-08-01), Niemeyer
patent: 3089473 (1963-05-01), Kueny
patent: 3234815 (1966-02-01), Line
patent: 3303833 (1967-02-01), Melling
patent: 3782345 (1974-01-01), Erickson et al.
patent: 3977370 (1976-08-01), Humphreys
patent: 4335685 (1982-06-01), Clouse

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