| 摘要 |
A valve train for a reciprocating internal combustion engine has a fulcrum means provided by the follower body of a hydraulic lash adjuster 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 geometric center of the outer conformation being located within the effective cross sectional area of the stem of an associate 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 stem end of the valve. Restrainer means are provided to anchor the cooperating cylindrical conformations for substantially rolling action in relation to each other. The rocker arm, when used in an overhead cam engine, preferably carries a cam follower roller rotating about an axis located as on an extension of the inner conformation. The hydraulic lash adjuster is positioned so that the operating axis of the follower body is located either parallel to the axis of the valve or so as to intersect the geometric center of the outer conformation.
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