| 摘要 |
An adjustable valve system for an engine (10) includes an axially shiftable camshaft (14) for connection to a source (24) of rotary power The shaft has at least one valve-actuating cam (28) with a lobe profile which varies along the axis of the camshaft (14). The system also includes a positioning mechanism (42) for controlling the axial position of the camshaft in said engine. A plurality of valves (36) control fluid communication with said engine (10). The system further includes a rocket (34) having contact portions which operatively engage the plurality of valves (36), mounting means (46) disposed in the engine for supporting the rocker and a cam follower (32) mounted on the rocker in rolling engagement with the cam (28). Exclusive pivots (46a, 58) are provided which permit the follower (32) and/or the rocker (34) to pivot relative to said engine (10) about two axes (A1,A2), one of which is generally parallel to the camshaft (14) and the other of which is generally perpendicular to that shaft so that when the camshaft (14) is rotated, the follower (32) maintains line contact with the cam (28).
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