Importance

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Abstract

Roller-tip rocker-arm for high-performance internal combustion engines, pivotable about a trunnion therethrough, having a roller in the tip thereof for contacting the stem of a valve depressed (i.e., in the engine, per se, 'lifted' from its seat in the 'closed' position) thereby and having on the other end (i.e., tail) thereof an arcuate surface for contacting and abutting the cooperatively shaped end of a pushrod, the latter of which lifts said tail, wherein the roller and arcuate surface are so positioned so that, at the point in the motion of the rocker-arm wherein the valve stem is at a location corresponding to the mid-lift of the valve to which it is attached, the angles (a) that the axis of the valve stem defines with the axis intersecting the axes of the roller and trunnion and (b) that the axis of the pushrod defines with the axis intersecting the center of the arcuate surface and the axis of the trunnion are both essentially 90 degrees. Such geometry eliminates the under-arcing and/or over-arcing of the roller-tip and/or pushrod characteristic of conventional rocker-arm operation and advantageously allows significantly improved engine performance. Optional means are provided on the rocker-arm to allow maximum accuracy in adjusting the position of rocker-arm mounting in the engine.

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First Claim