| 摘要 |
A valve train for a reciprocating internal combustion engine has a fulcrum means and a rocker arm that define a pair of cooperating outer and inner cylindrical bearing surface contours, respectively, for carrying the reaction forces of rocker arm pivotal movement, the radius of the outer conformation being substantially two times the radius of the inner conformation, with the center of revolution of the outer conformation being located on the operating axis of the valve, the inner conformation of the rocker arm being located such that an extension thereof will intersect the contact point of the rocker arm on the axis of the valve at the free end thereof. Restrainer means are provided to anchor the cooperating cylindrical conformations for substantially rolling action in relation to each other, the restrainer means comprising a retainer pin means extending outward from the inner conformation and slot means in the fulcrum means of a size to receive the retainer means, the recess means defining opposed sloping straight guide wall surfaces extending outward in the direction toward the center of the inner conformation and over which the retainer pin means slides during rocker arm oscillation, the retainer pin means having opposed sides conforming to the arcs of circles, the centers of which lie on the curved plane of the inner conformation arc.
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