| 摘要 |
<p>PROBLEM TO BE SOLVED: To minimize the fluid flow to the bearing to be supplied to the swash plate in an axial piston type hydraulic machine comprising a bearing supporting a swash plate to be tilted freely, a servo cylinder for changing the tilting angle by driving the swash plate, and a servo directional control valve adapted to control the pressurized fluid to said servo cylinder. SOLUTION: At the up-stream side of a servo automatic control valve 30, a restrictor 31 is positioned, and a pilot type spring off-set automatic shift valve 33 is positioned in the fluid supply line to the swash plate bearing 15. Further, the pilot pressure derived from the up and down stream of the restrictor 31 are applied to a pair of pilot room 33A, 33B of the automatic directional valve 30 through duct 34, 35, thereby, the supplying of lubricating fluid to the bearing 15 of wash plate will be executed only when the swah plate 14 is driven.</p> |
