发明授权
- 专利标题: Hydraulic pump
- 专利标题(中): 液压泵
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申请号: US774901申请日: 1991-10-11
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公开(公告)号: US5176428A公开(公告)日: 1993-01-05
- 发明人: Pierre Lebret
- 申请人: Pierre Lebret
- 申请人地址: FRX Drancy
- 专利权人: Bendix Europe Services Techniques
- 当前专利权人: Bendix Europe Services Techniques
- 当前专利权人地址: FRX Drancy
- 优先权: FRX90-13433 19901030
- 主分类号: B60T17/00
- IPC分类号: B60T17/00 ; B60T8/40 ; F04B49/08 ; F04B49/24 ; F04B53/10
摘要:
A hydraulic pump comprises at least one alternating-cycle piston (20) having a suction phase and a delivery phase, and sliding in a fixed cylinder (22). The pump possesses in addition a nonreturn suction valve (32) placed between a source of fluid under low pressure (28) and a working chamber (30) defined in the cylinder, and a nonreturn delivery valve (34) placed between the working chamber (30) and an output chamber (16) for the fluid under high pressure, connected to an application circuit 10, 12). The output chamber (16) possesses a wall (40) which is movable as a function of the pressure which prevails in the output chamber (16), the movable wall (40) being capable of controlling the locking of the delivery valve (34) in an open position substantially during the greater part of the suction phase when the pressure in the output chamber (16) is greater than a given pressure, in such a way that the suction valve (32) stays closed in a corresponding manner.
公开/授权文献
- US5709706A Surgical instrument 公开/授权日:1998-01-20