| 摘要 |
PROBLEM TO BE SOLVED: To make a capacity control structure most suitable to apply to a hydraulic motor to be made small in size, and light in weight. SOLUTION: Hydraulic pressure from a change-over valve 8 is fed to a two-speed change-over valve 6 as pilot pressure by letting hydraulic pressure from the change-over valve 8 be changed into pilot pressure so as to let a change-over operation be performed by means of a control valve V interposed between the two-speed change-over valve 6 and the change-over valve 8, meanwhile, it is so set up that pilot pressure having been fed to the two-speed change-over valve 6 can be released by letting the change-over valve 8 be operated. Pilot pressure to be fed to the two-speed change-over valve 6 is so set up as to be released while pilot pressure is being fed from the change-over valve 8 by letting pilot pressure caused by loading to a hydraulic motor 1, be supplied. |
