초록 ▼

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 w

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.

대표청구항 ▼

A tappet for transmitting motion from a rotatable cam to a valve of an internal combustion engine, said tappet being slidably supported for reciprocation along a first axis in a cylindrical bore of the engine, said tappet comprising a circular cylindrical body portion adapted to be slidably supporte

A tappet for transmitting motion from a rotatable cam to a valve of an internal combustion engine, said tappet being slidably supported for reciprocation along a first axis in a cylindrical bore of the engine, said tappet comprising a circular cylindrical body portion adapted to be slidably supported in the bore of the engine, a cam follower portion on said tappet having a cam engaging face comprising a segment of a circular cylinder the axis of generation of which extends parallel to the axis of rotation of said engine cam and the radius of generation of which is substantially greater than the radius of generation of the circular body portion of said tappet, said cam follower portion being contained entirely within the circular cross section of the body portion of said tappet so as to be reciprocable within the bore in said engine, and pivot means supporting the cam follower portion of said tappet for rotation relative to the body portion thereof about an axis extending at a right angle to the axis of reciprocation of said tappet and lying in a plane extending at a right angle to the axis of generation of the cam engaging face on the cam follower portion of said tappet.