| 摘要 |
<p>A crane (10) includes i) a lower structure (12) comprising ground engaging members(14, 16) ii) an upper structure (20) rotatably connected to the lower structure (12) such that the upper structure (20) can swing with respect to the lower structure (12), wherein one of the lower structure and upper structure (12, 20) comprises a first structure having a ring gear having teeth on a surface thereof, and the other of the lower structure and upper structure (12, 20) comprises a second structure; and iii) a boom (22) pivotally mounted on the upper structure.(20) The crane (10) further includes a drive system comprising at least two pinion gears mounted on a common frame (63) and in driving contact with the ring gear teeth (35); and a link (74) connecting the frame (63) to the second structure with two pivot axes between the frame (63) and the second structure.</p> |
