| 摘要 |
<p>PURPOSE:To obtain the small-sized and inexpensive hydraulic pump having the desired characteristics by allowing a pilot folow passage to communicate selectively to two control valves set by spring means by a selector valve. CONSTITUTION:The captioned device is constituted of a variable capacity type hydraulic pump A, control valve B set by the first spring 65 and the second spring 67, and a selector valve C. When the communication between the first chamber R1, second chamber R2, and a pilot flow passage 29 is controlled by the selector valve C, the angle of a swash plate 23 can be varied by varying the set pressure by the both springs 65 and 67. A number of characteristics can be obtained according to the relation of magnitude of the set pressure, and only one large hydraulic pump becomes necessary.</p> |
