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1. 发明授权

US5005467A Pilot-operated flow controlling directional control valve with copying spool 失效
标题翻译：先导式流量控制方向控制阀，带复制阀芯
公开(公告)号：US5005467A
公开(公告)日：1991-04-09
申请号：US195119
申请日：1988-05-17
申请人： Orjan E. V. Wennerbo , Bo Nilstam
发明人： Orjan E. V. Wennerbo , Bo Nilstam
IPC分类号： F15B13/042
CPC分类号： F15B13/0422 , Y10T137/86582 , Y10T137/87185
摘要： Device in a hydraulic power system connected to a load driving hydraulic motor (18; 32), comprising a pilot controlled flow regulating directional valve (1; 29) for alternative connection of the service ports of the motor (18; 32) to a pressure medium source and a tank. The directional valve (1; 29) comprises two opposite and by a pilot pressure activatable activating means (3, 4), and a pilot pressure means (84) is arranged to pressurize and activate the activating means (3, 4), alternatively, and drain one of the activating means to the tank through a flow restriction (5, 7) at activation of the other activating means (3, 4). The power system comprises at least one control flow circuit (10-12; 72-83; 37-44) which communicates with one of the activating means (3, 4), and a valve means (11, 12; 71; 31) which is arranged to accomplish a flow through the control flow circuit (10-12; 72-83; 37-44) in relation to the load pressure on the motor such that the counter pressure from the flow restriction (5, 7) generates a compensating force in relation to the load pressure on the motor on the non-activated activating means (3, 4).

2. 发明授权

US5501136A Control system for a hydraulic motor 失效
标题翻译：液压马达控制系统
公开(公告)号：US5501136A
公开(公告)日：1996-03-26
申请号：US265244
申请日：1994-06-24
申请人： Orjan E. V. Wennerbo , Kyle G. Martyn
发明人： Orjan E. V. Wennerbo , Kyle G. Martyn
IPC分类号： F15B13/04 , F15B11/08
CPC分类号： F15B13/0417 , Y10T137/87169 , Y10T137/87185
摘要： A control means for a hydraulic motor connected to an external load comprises a directional valve (10) for selectively feeding hydraulic fluid to the motor from a pressure source and including load pressure sensing means (24, 25) connected to a load compensating valve (15) located upstream of the directional valve (10) for adjusting automatically the feed pressure in relation to the actual load pressure. The load compensating valve (15) includes a valve spindle (28) with opposite end surfaces (29, 30), one of which is exposed to the load pressure whereas the other is exposed to the feed pressure, and a selectively activatable feed pressure reducing means (38, 43; 50-57) for increasing the bias force acting on the load compensating valve spindle (28) in the closing direction of the latter in relation to the bias force acting in the closing direction of said valve spindle (28).
摘要翻译：用于连接到外部负载的液压马达的控制装置包括用于从压力源选择性地将液压流体输送到马达的方向阀（10），并且包括连接到负载补偿阀（15,25）的负载压力感测装置（24,25））位于所述方向阀（10）的上游，用于相对于实际负载压力自动调节进给压力。负载补偿阀（15）包括具有相对端表面（29,30）的阀芯（28），其中一个暴露于负载压力，而另一个暴露于进料压力，并且可选择性地激活进料压力降低用于相对于在所述阀芯（28）的关闭方向上作用的偏压力增加作用在所述负载补偿阀芯（28）上的所述负载补偿阀芯（28）的关闭方向上的偏压力的装置（38,43; 50-57）。

3. 发明授权

US4845947A Hydraulic drive system 失效
标题翻译：液压驱动系统
公开(公告)号：US4845947A
公开(公告)日：1989-07-11
申请号：US175154
申请日：1988-03-30
申请人： Bengt-Goran Persson , Orjan E. V. Wennerbo
发明人： Bengt-Goran Persson , Orjan E. V. Wennerbo
IPC分类号： F15B11/16
CPC分类号： F15B11/16 , F15B2211/20538 , F15B2211/3116 , F15B2211/3144 , F15B2211/324 , F15B2211/40507 , F15B2211/45 , F15B2211/50572 , F15B2211/555 , F15B2211/71 , F15B2211/75
摘要： A hydraulic drive system for one or more hydraulic motors, comprising a pump (1), a tank (25) for hydraulic fluid, one or more control valve sections (10, 11, 12) each being provided with a shunt passage and each being coupled to a respective hydraulic motor, a first shunt conduit (4) including the shunt passages of said control valve sections (10, 11, 12) connected in series for leading off of the tank (25) the temporarly surplus flow of hydraulic fluid from the pump (1), and a feed conduit (3) for connecting the control valve sections (10, 11, 12) in parallel to the pump (1). A second shunt conduit (5) is connected between the pump (1) and the tank (25) and includes a pressure responsive valve (6) which is arranged to operate in response to pressure in said first shunt conduit (4) downstream of a first non-variable restriction (13), and also in response to pressure in said shunt conduit (5) downstream of a second non-variable restriction ( 14), to establish a direct connection through said second shunt conduit (5) from the pump (1) to the tank (5) in relation to the size of the fluid flow in said first shunt conduit (4).

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