| 摘要 |
<p>A cam (5) and similar such cams are mounted on a camshaft (4). The cam (5) actuates a body (6) which is mounted in a guideway (10A) and serves to displace a valve (1) of an internal combustion engine. The body (6) has two opposite side surfaces (6A and 6B) which are planar and parallel to one another and slide on two opposite planar surfaces (10B and 10C). The body (6) is externally elongate, possibly substantially rectangular, as seen when looking in the direction in which it slides. It may be formed with a trough (6C) of part-circular cross-section which receives a member (16) which is a segment, possibly a half, of a circular cylinder, the flat surface of the segment engaging the cam (5) and the member (16) being free to turn. The cam (5) may have an outline, in a section plane containing the axis (4a) of the camshaft (4) which is not parallel to that axis (4a), in which case there are means (7 and 11 or 71) for displacing the camshaft lengthwise.</p> |
