• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Hydraulic device fitted with a regulable pump (2), said pump serving to create pressure chiefly in a control circuit (4) provided with a control valve (7), and fitted also with at least one further hydraulic working circuit (5) with a flow control valve (3), which secures priority in the control circuit, and with a reverse valve, which regulates the pump according to whether hydraulic pressure is greater in the control circuit or the working circuit. A regulating valve (25) is fitted to the feed pipe to the working circuit, said valve maintaining a balance between the working pressure in the working circuit (5), together with a switch spring (28), and the flow pressure in the feed pipe (16).
    公开号:SU1716967A3
    申请号:SU894614823
    申请日:1989-08-18
    公开日:1992-02-28
    发明作者:Тишер Вернер
    申请人:Цанрадфабрик Фридрихсхафен Аг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a hydraulic device with an adjustable pump, which provides mainly a circulation control circuit with a control valve with a discharge medium and with at least one of the following hydraulic working circuits with a flow divider, which provides priority for the control circuit, and with a switching valve that controls the operation pump according to the increased hydraulic pressure of the control circuit or the working circuit.
    The purpose of the invention is to increase reliability.
    The drawing shows the hydraulic circuit of the proposed device.
    From the tank 1 for oil, the pump 2 sucks in the oil under pressure and feeds it into the flow divider 3. The flow divider 3 restricts the flow of pressurized oil from pump 2 with inactive hydraulic circuits, i.e. the control loop 4 and the working loop 5. The partial flow separator 3 supplied is used as a pilot flow in the pilot flow line 6 for the directional control valve 7. The measuring throttle 8 is installed in the pilot flow path 6 and is located between the cut-off edge between pump 2 and the flow path 6 pilot stream, i.e. at the output of a constant flow divider 3 flows.
    Thus, the working pressure in the feed stream directed to the working hydraulics through the hydraulic line 9 does not affect the absolute pressure prevailing on the measuring throttle 8.
    The control circuit has a conventional design, therefore, it is not described in more detail below. In the normal version it has a metering manual pump 10, through which the pressure medium is controlled for the control valve 7. Then for the hydraulic actuator! 1, safety valves 12 and 13 are provided, as well as valves 14 and 15 for additional suction. From the hydraulic line 16 to the control circuit 4, the hydraulic lines 17 and 18 branch to the control valve 19, through which the pump 2 is regulated depending on the pressure in the control circuit 4.
    In the working circuit 5, in the usual embodiment, there is a control valve 20, which is equipped with a manually adjustable actuating device 21. From the control valve 20, the working pressure 5 of the hydraulic line 22 is branched off to the control valve 19, by means of which the pump 2 is switched according to the prevailing pressure in the control circuit 4 or in the working circuit 5.
    From the control valve 20, in the usual embodiment, the hydraulic lines 23 pass to the actuator hydraulic cylinder 24.
    Between the flow dividers 3 and the control valve 20, a hydraulic control valve 25 is built into the hydraulic line 9. The control element of the valve 25 on opposite sides is supplied with pressure through the hydraulic line 2β through the hydraulic line 9 and through the hydraulic line 27, which branches off from the hydraulic line 22, which controls the pressure. Since the working pressure prevails in the hydraulic line 22, the working pressure also prevails on this side of the permutation element of the crane 25. The permutation element on this side is further provided with a switching spring 28.
    The crane 25 functions as a balancer or pressure compensator. It compares and thereby the equilibrium state between the pressure in the hydraulic line 9 to the control valve 20 and the working pressure in the working circuit 5 through the hydraulic lines 27 together with the switching spring 28. As a result, even with a pressure drop in the hydraulic line 9, the working speed in the actuating hydraulic cylinder 24 can be maintained independently from the pressure level in the control circuit 4.
    If the pressure in the inlet hydraulic line 9 increases, then, on the basis of a corresponding permutation in the valve 25, it decreases accordingly to restore equilibrium, since in this case the switching element in the valve moves to the right against the pressure in the hydraulic line 27 and the spring pressure 28 and thereby throttles the feed.
    权利要求:
    Claims (2)
    [1]
    Claim
    1. A hydraulic device with an adjustable pump, comprising a control circuit including a hand pump, an actuating hydraulic cylinder and a three-position seven-line valve, the first and second lines of which are connected to the hand pump, the third and fourth lines - to the actuating cylinder, the fifth - to the drain, and at least at least one working circuit, including an actuating hydraulic cylinder, a three-position manually controlled valve, a pump and a hydraulically controlled flow divider, the first line
    5 of the three-way valve is connected to one output of the flow divider ^ the input of which is connected to the pump, the second line to the drain, the third and fourth to the executive hydraulic cylinder, the second outlet of the flow divider is connected to the sixth and 5th through the throttle lines of the control valve circuit, and the control lines of the flow divider are connected with its second output - one directly, and the other through the aforementioned drosel-10 sel, characterized in that, in order to increase reliability, it is equipped with * spring-loaded hydraulic a crane installed in the hydraulic line connecting the flow divider to a manually controlled hydrodistributor, which is made five-linear, the fifth line of which is connected to one of the control cavities of the crane and the control line for the pump, made adjustable, 20 the second control line of the crane is connected to the first line of the five-way valve, while in the first position of the latter the second and fourth lines are connected, and the first and fifth - with the third, in the second position the first, third and fourth lines are locked, the second, and fifth A N are interconnected, and in the third position the first and fifth line connected to the fourth, and the second - third.
    [2]
    2. The device according to claim 1, with the proviso that it is equipped with a hydraulically controlled three-line on-off hydrodistributor, the first and second lines of which are connected respectively to the fifth line of a three-position manually controlled hydrodistributor 15 and a pump flow control line and the third and one of the control lines are connected to the sixth line of the seven-line three-position control valve of the control circuit, and the second control line is connected to its first line.
    fifty
    类似技术:
    公开号 | 公开日 | 专利标题
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    SU1716967A3|1992-02-28|Hydraulic device with variable-capacity pump
    US5107753A|1992-04-28|Automatic pressure control device for hydraulic actuator driving circuit
    US3478647A|1969-11-18|Circuit for hydraulically operable devices,especially hydraulic dredges
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    JPS5969505A|1984-04-19|Cavitation preventing circuit
    JPH08270606A|1996-10-15|Load sensing circuit
    JP2639554B2|1997-08-13|Hydraulic equipment
    同族专利:
    公开号 | 公开日
    YU23288A|1990-06-30|
    EP0346352A1|1989-12-20|
    DE3861769D1|1991-03-14|
    BG60155A3|1993-11-15|
    CN1012053B|1991-03-20|
    WO1988006114A1|1988-08-25|
    CN88100812A|1988-08-31|
    EP0346352B1|1991-02-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4005636A|1975-02-13|1977-02-01|J. I. Case Company|Hydraulic system for a working machine|
    DE3149026C2|1981-12-11|1987-08-13|Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen, De|
    US4463557A|1983-08-12|1984-08-07|Deere & Company|Open center hydraulic system|
    IT1200764B|1984-11-28|1989-01-27|Zahnradfabrik Friedrichshafen|CONTROL DEVICE FOR TWO HYDRAULIC SETTING DEVICES, FEEDING EACH THROUGH A CURRENT BRANCH AND USING A HIGH PRESSURE PUMP|
    DE3507122C2|1985-02-28|1989-03-16|Mannesmann Rexroth Gmbh, 8770 Lohr, De|
    DE3619331C2|1985-07-19|1989-05-18|Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen, De|CA2458002C|2001-08-24|2010-08-17|Michelin Recherche Et Technique S.A.|Non-pneumatic tire|
    EP1484232B1|2002-03-08|2010-10-27|Kayaba Industry Co., Ltd.|Flow control device for power steering|
    SE525355C2|2003-06-19|2005-02-08|Hydrauto Valves Ab|Outriggers valve|
    CN101489853B|2006-12-21|2012-06-06|日立建机株式会社|Steering system for working vehicle|
    US9315208B2|2012-09-13|2016-04-19|Trw Automotive U.S. Llc|Power steering apparatus|
    DE102014208019A1|2014-04-29|2015-10-29|Robert Bosch Gmbh|Hydraulic control arrangement for a plurality of actuators|
    CN108266416B|2018-01-25|2019-07-12|宁波日安精工机械有限公司|A kind of flow divider valve for double pump system|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE3705309|1987-02-19|
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