| 摘要 |
<p>A grooved cam includes an upper cam (3A), a lower cam (3B) and a bush (8), wherein one end of the upper cam (3A) and the lower cam (3B) is a plane which is perpendicular to the axis thereof and the other end is formed to a curved surface with a lift stroke and a return stroke. Moreover, the upper cam (3A) and the lower cam (3B) are inserted within the inner portion of the bush (8) from the two end of the bush, respectively, so that the highest point of the curved surface of the upper cam (3A) could be corresponding with the lowest point of the curved surface of the lower cam (3B). Therefore, there is a ring-shape closed inner groove between said curved surfaces of the upper cam and the lower cam and said inner portion of the bush (8), so as to form the lift stroke and the return stroke therein. Furthermore, said grooved cam according to the present invention has many advantages, such as high reliability, lower cost and simple process.</p> |
