| 摘要 |
<p>A pump operating unit (40) is provided in an operating section for controlling the steering and speed change of travelling sections (1L, 1R) connected interlockingly to a pair of variable flow rate control pumps (PL, PR) via link mechanisms (NL, NR) for a spool, and operated by a steering mechanism (33) and a speed changing mechanism (37). Accordingly, the natural vibration occurring in the variable flow rate control pumps (PL, PR) is absorbed by the link mechanisms (NL, NR), and hence the vibration transmitted to the pump operating unit (40) is attenuated. The propagation of the vibration to the steering mechanism (33) and speed changing mechanism (37), which are interlockingly connected to the pump operating unit (40), is prevented.</p> |
