| 摘要 |
PURPOSE:To simplify the displacement control means and the like of a hydraulic motor and reduce the number of part items so as to improve workability at the assembling time and make the whole body compact. CONSTITUTION:A first control line 32 branched from a braking line 9 between a pressure reducing valve 10 with a throttle and a braking device 14 is directly connected to the oil chamber B of a displacement control cylinder 31, and a second control line 38 changeover-connected to a tank 4 and a pressure reducing valve 35 through a displacement change-over valve 36 is directly connected to the oil chamber A of the displacement control cylinder 31. When the displacement change-over valve 36 is switched into a low pressure position (f) by a switching lever 37 in order to control the displacement of a hydraulic motor 1, control pressure of low pressure value is supplied into the oil chamber A of the displacement control cylinder 31 through the second control line 32, and at the time of switching into a high pressure position (g) from a low pressure position (f), control pressure of high pressure value is supplied into the oil chamber A of the displacement control cylinder 31 from the second control line 38. |
