• 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:
    A pressure override control which utilizes pump output flow for destroking of a variable displacement pump to minimize loss of power and generation of heat and which includes modifications to the displacement control valve for the pump and, particularly, the cross connection of displacement-controlling servo motors when the displacement control valve is in a neutral position with blocking of communication of said servo motors to a displacement control pressure and drain whereby the pump cannot be positioned in a maximum displacement position in response to certain system malfunctions in the power override control circuitry.
    公开号:SU1179940A3
    申请号:SU802965449
    申请日:1980-08-13
    公开日:1985-09-15
    发明作者:В.Поллман Фредерик；В.Крулл Стэнли
    申请人:Сандстрэнд Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    2. The device according to claim 1, wherein it is equipped with a second normally closed pressure valve installed in the second communication line of the cavity of another
    servomotor with suction master; Pour the variable flow pump to which the control line of the second pressure valve is connected.
    one
    The invention relates to engineering hydraulics and can be used in hydraulic systems with stringent requirements for pressure.
    A pressure control device is known for a variable-capacity pump comprising two servomotors with control cavities associated with a pump control element, a make-up pump, a reversible control four-line three-way spool valve connected to one discharge line, and the other to a feed pump and two lines - to the cavity of the servomotors and configured to shut off the drain and the feed pump in the middle position of the distributor valve, and normally close the pressure valve, installed lenny to link the cavity of one of the servo motors with the pump discharge manifold variable capacity, to which is connected a control line valve etego January 1.
    However, this device is characterized by insufficient reliability and efficiency of adjustment over the entire pressure range.
    The purpose of the invention is to optimize the process of pressure regulation,
    This goal is achieved by the fact that in a pressure control device dp of a variable-capacity pump containing two servomotors with control cavities connected to the pump control body, a make-up pump, a reversible control four-line three-way spool valve connected by one line to the drain, the other to a feed pump and two lines to the servomotor cavity and a complete
    with the possibility of shutting off the drain and the make-up pump in the middle position of the distributor valve, and normally close the pressure valve installed on the communication line of the cavity of one of the servomotors with the discharge line of the variable capacity pump to which it is connected. the control line of this valve, the distributor spool is provided with a central channel with a throttle for communication in the middle position of the distributor of the servomotor cavities among themselves.
    In addition, the device is equipped with a second normally closed pressure valve installed in the second communication line of the cavity of another servomotor with a suction line of a variable-capacity pump to which the control line of the second pressure valve is connected.
    FIG. 1 is a schematic hydraulic diagram of a pressure control device; in fig. 2 reversing control valve with spool, section.
    A pressure control device for a variable capacity pump 1 comprises servomotors 2 and 3 with control cavities 4 and 5 connected to the pump control unit 6, a charge pump 7, a reversing control spool distributor 8 connected by line 9 to a drain 10, and another line 11 - to pump 7, make-up and lines 12 and 13 - to cavities A and 5 of servomotors 2 and 3 and. Excessively with the possibility of shutting off the drain 10 and the pump 7 of the feed in the middle position of the spool 14. (Fig. 2) of the distributor 8, and the normally closed pressure valve 15 installed on the link 16 of the servo motor cavity 5 with the discharge line 17 of the pump 1 to which it is connected valve control line 18 15. The device is also equipped with a second normally closed pressure valve 19 installed in the second communication line 20 of the cavity 4 of the servomotor 2 with the suction pipe 21 of pump 1 to which the control 22 of the second valve 19 is connected and. The device is also equipped with non-return valves 23-26 and a retaining valve 27. The capacity is controlled by the handle 28. The pressure valves 15 and 19 are equipped with throttles 29 and 30. The output hydraulic motor 31 is connected to the pressure control devices. The distributor 8 (FIG. 2) contains spool 14 with grooves 32, 33 and 34, central channel 35 and throttle 36; housing 37 with grooves 38-42. The device works as follows. The performance adjustment is realized by moving the handle 28 which acts on the spool 14 of the distributor 8, moving it to one of the positions, thus connecting the control and control cavities 4 and 5 of servomotors 2 and 3 with the pump 7 and merging 10. Servomotors 2 and 3 move the organ 6 control, pump 1 in one direction or the other, adjusting its performance. The servomotors 2 and can also reverse the flow of the pump 1. The movement of the control body 6 causes the spool 14 of the distributor 8 to move to the neutral position. Thus, a certain level of performance of the pump 1 is established. When the pressure changes, for example, the discharge line 17 (for example, when the load on the hydraulic motor 31 increases) is higher than the valve 15 pressure setting, the latter is triggered and the fluid enters through throttle 29 control cavity 5 of servomotor 3. Throttle 36 prevents pressure in cavity 4 of control of servomotor 2. As a result, control body 6 of pump 1 moves an angle of lesser capacity. At the same time, the spool 14 of the distributor 8 is moved, which communicates the feed pump 7 with the line 12. The adjustment takes place until the forces on the control element of the servomotors 2 and 3 are equalized and the response time of the pump 1 .. The required level is set in the discharge line 17 pressure. When pump 1 is reversed by moving the knob 28 clockwise, fluid from pump 1 enters the suction line 21, the pressure in which is adjusted in a similar way through the second pressure valve 19, the second communication line 20, the servomotors 2 and 3, and the distributor 8. The device pressure control ensures safe operation also when the normally closed valves 15 and 19 are out of pressure (for example, when they are jammed in neutral positions) by reporting cavities 4 and 5 to control the motor 2 and 3 through the spool 14 of the distributor 8. A certain pressure level is established in the device and when the check valves 25 to 26 fail due to the fact that in lines 12 and 13 a pressure is established through the choke 36 through choke 36 the pressure of the feed pump 7. Thus, in this device, the pressure is optimally adjusted in all modes of operation of the hydraulic motor due to the use of a larger flow of fluid from the pump. In addition, the device also makes adjustments in the event of failures of check valves or pressure valves. JB3S 33 34 0 32X / U / / k J LA .. “. , L "" I i I
    FIG. 2 8 /
    权利要求:
    Claims (2)
    [1]
    1. A PRESSURE REGULATING DEVICE FOR A VARIABLE PUMP PUMP, containing two servomotors with control cavities connected to the pump control, a charge pump, a reversing control four-line three-position spool valve connected by one line to the drain, and the other to the charge pump and two - to the cavities of the servomotors and made with the possibility of disabling the drain and the make-up pump in the middle position of the valve spool, and a normally closed pressure valve installed on a . the communication line of the cavity of one of the servomotors with the discharge line of a variable displacement pump, to which the control line of this valve is connected, characterized in that, in order to optimize the pressure control process, the spool of the distributor is equipped with a central channel with a throttle for communication between the distributor of the servomotor cavities in the middle position .
    4> w.f
    [2]
    2. The device according to claim ^ characterized in that it is equipped with a second normally closed pressure valve installed in a second communication line of the cavity of another servomotor with a suction line of a variable displacement pump, to which a control line of the second pressure valve is connected.
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1179940A3|1985-09-15|Pressure control device for variable capacity pump
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    MY131602A|2007-08-30|Hydraulic device for construction machinery
    US3956891A|1976-05-18|Closed center hydraulic system for lift trucks
    US3969985A|1976-07-20|Fluid actuating device for an electric circuit breaker
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    US6109030A|2000-08-29|Apparatus and method for ganging multiple open circuit pumps
    US5344290A|1994-09-06|Method and device for controlling a double-cylinder thick matter pump
    JPH0419406A|1992-01-23|Hydraulic working circuit
    US3186310A|1965-06-01|Volume control for variable volume fluid pressure translating device
    US4660380A|1987-04-28|Hydraulic control arrangement
    US4161865A|1979-07-24|Steering control with hydraulic follow-up
    US4960035A|1990-10-02|Control system for a hydraulic lift driven by a variable displacement pump
    US4815289A|1989-03-28|Variable pressure control
    GB2106188A|1983-04-07|Hydraulic cylinder control
    US4770205A|1988-09-13|Bi-directional snub valve
    SU1235816A1|1986-06-07|Hydraulic drive for crane boom
    SU1672011A1|1991-08-23|Multi-channel adaptive hydraulic drive
    SU1549843A1|1990-03-15|Vehicle hydrostatic steering system
    RU1789801C|1993-01-23|Limited power hydraulic system
    SU1375894A1|1988-02-23|Hydraulic system
    SU1536030A1|1990-01-15|Mechanism for controlling a variable-displacement pump
    RU1788347C|1993-01-15|Hydraulic drive for feed
    SU1691485A1|1991-11-15|Hydraulic drive of single-bucket excavator
    同族专利:
    公开号 | 公开日
    PL226231A1|1981-05-22|
    JPS5629085A|1981-03-23|
    IT8049472D0|1980-08-12|
    JPH0432257B2|1992-05-28|
    BR8004090A|1981-04-22|
    FR2463446A1|1981-02-20|
    GB2059113B|1983-02-16|
    FR2463446B1|1983-08-19|
    CA1135158A|1982-11-09|
    US4476680A|1984-10-16|
    DE3022918A1|1981-02-26|
    PL132229B1|1985-02-28|
    IT1146989B|1986-11-19|
    GB2059113A|1981-04-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    US3659963A|1970-03-19|1972-05-02|Gen Signal Corp|Pressure override for servo controlled pumps|
    DE2261725A1|1972-12-16|1974-06-20|Kloeckner Humboldt Deutz Ag|CONTROL DEVICE FOR A HYDROSTATIC MOTOR VEHICLE TRANSMISSION|
    US3908519A|1974-10-16|1975-09-30|Abex Corp|Control systems for a variable displacement pump|
    DE2449464A1|1974-10-19|1976-05-06|Kloeckner Humboldt Deutz Ag|HYDROSTATIC VEHICLE TRANSMISSION|
    JPS5649769Y2|1975-07-29|1981-11-20|
    US4076459A|1976-09-14|1978-02-28|Abex Corporation|Horsepower limiter control for a variable displacement pump|
    DE2644128C2|1976-09-30|1987-09-24|Robert Bosch Gmbh, 7000 Stuttgart, De|
    US4116002A|1977-08-22|1978-09-26|Eaton Corporation|Control for a variable displacement pump or motor|US4419610A|1982-03-19|1983-12-06|Sundstrand Corporation|Reversible regenerating electric vehicle drive|
    FR2552187B1|1983-09-20|1987-08-28|Linde Ag|CONTROL OR REGULATION DEVICE FOR A HYDRAULIC TRANSMISSION|
    US4696162A|1984-05-09|1987-09-29|Sundstrand Corporation|Multi-function valve|
    GB8424658D0|1984-09-29|1984-11-07|Commercial Hydraul Glouces Ltd|Mechanical linkage|
    US4722186A|1986-01-24|1988-02-02|Sundstrand Corporation|Dual pressure displacement control system|
    US4745746A|1986-08-22|1988-05-24|Sundstrand Corporation|Power control for a hydrostatic transmission|
    JP2840671B2|1987-02-28|1998-12-24|株式会社島津製作所|Hydraulic transmission for traveling vehicles|
    US4936095A|1988-10-28|1990-06-26|Eaton Corporation|Hydrostatic transmission system and power limiter control therefor|
    DE4029548C2|1990-09-18|1993-03-04|Hydromatik Gmbh, 7915 Elchingen, De|
    US5160245A|1991-05-01|1992-11-03|Sauer, Inc.|Displacement control feedback apparatus and method|
    US5205201A|1991-08-19|1993-04-27|Sauer, Inc.|Displacement control valve|
    JP2580483B2|1994-02-18|1997-02-12|株式会社小松製作所|Control device for hydrostatic-mechanical transmission|
    CA2260684C|1998-02-06|2004-06-01|Robert D. Backer|Pump enable system and method|
    JP4001424B2|1998-09-08|2007-10-31|株式会社小松製作所|Control method and control apparatus for hydraulic drive circuit|
    DE10110935C1|2001-01-23|2002-11-28|Brueninghaus Hydromatik Gmbh|Hydraulic control, in particular for controlling the slewing gear of an excavator|
    FR2824888B1|2001-05-17|2003-10-03|Poclain Hydraulics Ind|HYDROSTATIC GEAR TRANSMISSION CIRCUIT|
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    US20100216758A1|2005-08-10|2010-08-26|Makoto Ando|Pyridone Compounds|
    US7926267B2|2008-03-20|2011-04-19|Caterpillar Inc.|Hystat transmission having pressure override control|
    US8647075B2|2009-03-18|2014-02-11|Eaton Corporation|Control valve for a variable displacement pump|
    US8661804B2|2009-12-11|2014-03-04|Caterpillar Inc.|Control system for swashplate pump|
    FR2978506A1|2011-07-29|2013-02-01|Poclain Hydraulics Ind|HYDRAULIC CONTROL CIRCUIT|
    US9803508B2|2015-08-24|2017-10-31|Saudi Arabian Oil Company|Power generation from waste heat in integrated crude oil diesel hydrotreating and aromatics facilities|
    US9803511B2|2015-08-24|2017-10-31|Saudi Arabian Oil Company|Power generation using independent dual organic rankine cycles from waste heat systems in diesel hydrotreating-hydrocracking and atmospheric distillation-naphtha hydrotreating-aromatics facilities|
    US9803506B2|2015-08-24|2017-10-31|Saudi Arabian Oil Company|Power generation from waste heat in integrated crude oil hydrocracking and aromatics facilities|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/066,499|US4476680A|1979-08-14|1979-08-14|Pressure override control|
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