US3891354A - Regulating system for pumps - Google Patents

Regulating system for pumps Download PDF

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Publication number
US3891354A
US3891354A US478392A US47839274A US3891354A US 3891354 A US3891354 A US 3891354A US 478392 A US478392 A US 478392A US 47839274 A US47839274 A US 47839274A US 3891354 A US3891354 A US 3891354A
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United States
Prior art keywords
pump
fluid
pumps
control slide
regulating
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Expired - Lifetime
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US478392A
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English (en)
Inventor
Paul Bosch
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Robert Bosch GmbH
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Robert Bosch GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
    • F04B49/128—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the cylinders, e.g. by moving a cylinder block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F04B49/103—Responsive to speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/08—Cylinder or housing parameters
    • F04B2201/0805—Rotational speed of a rotating cylinder block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1213—Eccentricity of an outer annular cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/04—Settings

Definitions

  • ABSTRACT A motor such as an internal combustion engine or an [30] Foreign Application Priority Data electric motor, drives two or more pumps, which June 22 1973 Germany 2331617 P fluid through a discharge System and a Speed measuring device is provided for producing a signal 52 US. c1 417/216; 60/449 when the Speed of the meter is reduced due to the 51 1111.01.
  • the invention relates to a pump system of the type wherein pumps are driven by an internal combustion engine or an electric motor; wherein a signal is derived from the operating load on the motor, influenced by such characteristics as the motor speed and the discharge pressure of the pumps; and wherein such discharge pressure is utilized in a regulating device for adjusting the amount of fluid discharged by the pumps and particularly for reducing such amount in response to a high load, short of an overload which would stall the engine.
  • the invention has the object of overcoming the above-mentioned problems, and other problems previously encountered in connection with pump systems of the indicated type, as will be noted hereinafter.
  • Another object is to protect the drive motor for the pumps from overload by a regulating system of simple construction.
  • each regulator having pressure responsive means with two surfaces connected or connectable to fluid pressure.
  • a load measuring device produces a signal in response to a predetermined high load on the motor for directing fluid pressure to one of these surfaces, whereupon the regulator causes the amount of fluid discharged by the respective pump to be reduced.
  • this load-responsive system is arranged so as to reduce, initially, the amount of fluid discharged by the pump which has the highest discharge pressure. If the resulting adjustment of the motor load is still insufficient to avoid the danger of overloading, the system also reduces the amount of fluid discharged by the other pump or pumps.
  • FIGURE is an elevational view of an embodiment of the invention, certain parts being shown in section and other parts being shown in block diagram form.
  • two or more adjustable pumps 10, 11 are driven by a motor 12, common to these pumps 10, ill and rigidly coupled to the pump rotors (not shown) by a shaft 13.
  • the pumps have separate dischargelines 41, 48 respectively. They are constructed to discharge an adjustable amount of fluid, and particularly an adjustable amount of liquid, into their respective discharge lines, against variable pressures prevailing in these lines.
  • the adjustment of fluid volumes discharged by the illustrated pumps 10, 11 is performed, in a known manner, by adjusting means in form of control rings 15 which can be shifted transversely relative to the pump casings 10', l l the pumps being preferably of the radial piston or vane piston type, known to persons skilled in the art.
  • each pump l0, 11 can be shifted from a centered position, shown in the drawing, relative to the respective casing 10 or 11' toward the right, as viewed in the drawing, to increase the amount of fluid delivered, or toward the left to decrease the amount.
  • Each pump 10, 11 is surrounded by a hydraulically operated adjusting device 16, 16' for adjusting the eccentricity of the control ring l4, 15. Both pumps are provided with identical adjusting devices, and therefore only the elements of the adjusting device for the pump 10 will now be described in detail.
  • the corresponding elements of the adjusting device for the pump 11 are referred to with the same reference numerals to which a prime is added.
  • the adjusting device for the pump 10 may comprise a block l6.which surrounds the pump 10 and has transversely to the pump axis a large cylinder or bore 18 on one side of the pump and coaxially with cylinder 18 and transversely opposite the same on the other side of the pump, a smaller cylinder or bore 19.
  • a piston 20, closely and slidably guided in cylinder 18, is biassed into engagement with the control ring 14 by a spring 21 and additionally, in certain positions of the apparatus, by fluid pressure in cylinder 18.
  • a piston 22 is slidingly guided in the opposite smaller cylinder 19, and is biassed by a spring 23 to contact the control ring 14 at a point diametrically opposed to the point of contact of piston 20. Fluid pressure is supplied to the cylinders 18, 19 through ducts which will be described presently. I
  • a pressure actuated regulator 17 is mounted on the aforementioned block 16 with the aid of conventional fastening and gasketing means, notshown.
  • a control slide 25 is slidingly inserted in a bore 24 in regulator 17, this bore being transverse to cylinder 18 and has a generally closed lower end, while its enlarged upper end contains a regulator spring 26. An upper end of this spring bears against a regulating screw 27, closing the upper end of bore 24. The opposite lower end of spring 26 bears against the top of control slide 25.
  • the slide 25 has a central blind bore 28 which extends from the bottom of the slide 25 into the latter.
  • a small piston or pin 29 is slidingly guided in bore 28.
  • This small piston 29 has a lower end bearing against the closed lower end of bore 24.
  • F1 is identified as F1 while the small piston 29 has a cross section of an area F2.
  • the control slide 25 is cylindrical and has two annular grooves 30, 31 spaced apart and spaced from the ends of the slide 25.
  • the upper groove 30 is connected with the blind bore 28 by a transverse aperture 32.
  • a land 34 between the two annular grooves 30, 31 closes a transverse aperture 35 which interconnects the regulator bore 24 with the cylinder 18 of the larger pump adjusting piston 20.
  • a duct 36 connects the regulator bore 24 with an open container or sink 37.
  • Another duct 34 shown above the aperture 35, connects the regulator bore 24 with a conduit 39.
  • the conduit 39 is also connected with a duct 40, extending through the pump adjustor block 16 to the smaller cylinder 19. Pressure is supplied to duct 39 by the discharge line 41 of pump 10. In the second unit, correspondingly, pressure is supplied to a duct 39 by the discharge line 48 of pump 11.
  • the discharge lines 41, 48 are further connected by conduits 42 and 47 to a selector valve 43, shown as a two-way valve with two valve seats 44, 45 with which the conduits 42, 47 respectively communicate.
  • the seats 44, 45 are alternately closed or opened by a single valve member, shown as a ball 46.
  • a solenoid valve 50 which has a closed position I and an open position 11.
  • the control magnet 51 of solenoid valve 50 can be energized through a conductor 52, from an electronic control device 53, which serves to compare a rated value up for the rotational speed of motor 12 with the actual rotational speed ni, determined by a speedometer 54 on shaft 13.
  • solenoid valve 50 When solenoid valve 50 is in open position II, it interconnects pressure line 49 with a duct 55 at the bottom of slide bore 24, through a duct 56.
  • the corresponding ducts of the other regulator 17' are identified as 55 and 57 and are similarly connected to solenoid valve 50. Additionally connected to ducts 56 and 57 is a further duct which leads by way of a throttle 58 to a sink 59.
  • the regulating devices l7, 17 are additionally adapted to prevent overloading and stalling of internal combustion engines 12 driving the pumps, or stalling and burning of the motor windings when the drive motor is an electric motor.
  • the electronic control device 53 then sends a high-load signal through conductor 52 to solenoid 51 of valve 50, shifting this valve from its normal closed position to its open position II. Thereby, the ducts 56, 57 are connected with the duct 49, and the duct 49 is connected with that pump discharge line 41 or 48 in which the higher pressure prevails.
  • the pressure from the higher pressure carrying line 41 or 48 acts now over the ducts 56, 57 on the annular surfaces F respectively F of the control slide 25, respectively 25 so that the control slide will be raised which is located in the bore subjected to the higher pressure.
  • both pumps 10, 11 may have their discharge lines 41, 48 connected to a single discharge line (not shown) to expose both pumps to a single back pressure, and for example the system may be arranged so that the combined line receives the sum of the full discharges of pumps 10, 11. It is still desirable, in many cases, to ini tially reduce the amount of fluid furnished by one of the pumps and only thereafter if necessary to reduce that of the other pump. In this event the sequence of regulating actions can be selected by differently adjusting the biasing springs 26 and 26' of the pump regulators 17, 17'.
  • the control signal responsive to the load on motor 12 can also be derived by devices other than a tachometer 54.
  • motor 12 is a Diesel engine the actual speed ni can be impressed on the electronic control device 53 by variable positioning of the control lever of the fuel injection pump (not shown).
  • control signals other than the electronic ones mentioned above and correspondingly to use control valves 50 of other construction than the abovementioned solenoid valve.
  • a regulating arrangement for preventing overloading and stalling of the drive motor, said regulating arrangement comprising at least two displacement control regulating means, one for each pump, and each having control slide means having a'first and a second surface adapted to be subjected'to the fluid pressure in the discharge system for moving the respective displacement control regulating means to thereby regulate the amount of fluid pumped by the respective pump; signalling means cooperating with said drive motor for producing a signal in response to a predetermined high load on the motor; and means for subjecting said first surface to the fluid pressure in the discharge system in response to one of said signals so as to move the control slide means of at least one of said pumps to thereby reduce the amount of fluid delivered by said at least one pump.
  • said signalling means comprises a speedometer producing a signal when the number of revolutions per time unit of said drive motor drops below a predetermined minimum.
  • said discharge system comprises a separate discharge line for each of said pumps, and including selector valve means for selecting the discharge line of that one pump which pumps fluid at the highest pressure and for connecting the discharge line of said one pump to said means for subjecting said first surface to the fluid pressure.
  • each of said displacement control regulating means comprises a housing formed with a bore
  • said control slide means comprising a control slide movable in said bore of said housing and being formed with a blind bore extending from one end of said control slide into the latter and having a closed end, and a piston in said blind bore projecting beyond said one end of said control slide and abutting against said housing, said first surface being an annular surface at said one end of said control slide about said piston and said second surface being the surface at said!
  • passage means for normalling subjecting the interior of said blind bore to the fluid pressure in the discharge system to thereby move said control slide in a first direction and biassing means for moving said control slide in a second direction opposite to said first direction, said control slide being movable from a neutral position in said first direction when the pressure in said discharge system drops below a predetermined pressure to thereby regulate the respective pump to increase the amount of fluid pumped thereby, and said control slide moving in said second direction uponsubjecting said first surface to said fluid pressure to thereby regulate the respective pump to decrease the amount of fluid pumped thereby.
  • each of said pumps comprises adjusting means for regulating the amount of fluid delivered by the respective pump, said adjusting means comprising an adjusting member movable in one direction for increasing the amount of fluid delivered by said pump and in the opposite direction for decreasing the amount and a pair of cylinder and piston means for moving said adjusting member in the one and in the opposite direction, and including passage means for supplying fluid to said cylinder and piston means for moving said adjusting member in said one direction when said control slide is moved from said neutral position in said first direction and for moving said adjusting member in said opposite direction when said control slide is moved from said neutral position in said second direction.
  • said discharge system comprises a separate discharge line for each of said pumps, and including selector valve means for selecting the discharge line of that one pump which pumps fluid at the highest pressure and first conduit means connecting said selector valve means to said solenoid valve, said solenoid valve being normally in a closed position and being moved from said closed to an open position upon receiving a signal from said signalling means and further conduit means to direct fluid from said first conduit means to said first surfaces of said regulating means in said open position of said solenoid valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
US478392A 1973-06-22 1974-06-11 Regulating system for pumps Expired - Lifetime US3891354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2331617A DE2331617A1 (de) 1973-06-22 1973-06-22 Regeleinrichtung fuer hydropumpen

Publications (1)

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US3891354A true US3891354A (en) 1975-06-24

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US478392A Expired - Lifetime US3891354A (en) 1973-06-22 1974-06-11 Regulating system for pumps

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US (1) US3891354A (OSRAM)
JP (1) JPS5037001A (OSRAM)
DE (1) DE2331617A1 (OSRAM)
FR (1) FR2234799A5 (OSRAM)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952515A (en) * 1975-02-20 1976-04-27 Caterpillar Tractor Co. Speed and load responsive underspeed actuator for hydrostatic transmissions
US3988892A (en) * 1974-11-19 1976-11-02 Robert Bosch G.M.B.H. Regulating arrangement for hydraulic pumps
US3999892A (en) * 1976-02-09 1976-12-28 Caterpillar Tractor Co. Interconnected pump control means of a plurality of pumps
US4008004A (en) * 1975-12-22 1977-02-15 Abex Corporation Control system for variable displacement pumps
US4017219A (en) * 1975-12-22 1977-04-12 Abex Corporation Control system for variable displacement pumps
US4029439A (en) * 1975-12-22 1977-06-14 Abex Corporation Control system for variable displacement pumps
US4032260A (en) * 1975-02-12 1977-06-28 Robert Bosch G.M.B.H. Hydraulic control device
US4158529A (en) * 1975-02-12 1979-06-19 Robert Bosch Gmbh Control device for a pumping arrangement
US4212596A (en) * 1978-02-23 1980-07-15 Caterpillar Tractor Co. Pressurized fluid supply system
WO1981001031A1 (fr) * 1979-10-15 1981-04-16 Hitachi Construction Machinery Procede de commande d'un systeme de moteur a combustion interne et de pompe hydraulique
WO1982001396A1 (en) * 1980-10-09 1982-04-29 Izumi Eiki Method and apparatus for controlling a hydraulic power system
JPS57171042A (en) * 1981-04-15 1982-10-21 Hitachi Constr Mach Co Ltd Control system for series including internal-combustion engine and hydraulic pump
JPS57173533A (en) * 1981-04-16 1982-10-25 Hitachi Constr Mach Co Ltd Controller of device containing internal combustion engine and oil hydraulic pump
US4600364A (en) * 1983-06-20 1986-07-15 Kabushiki Kaisha Komatsu Seisakusho Fluid operated pump displacement control system
US4637781A (en) * 1984-03-30 1987-01-20 Kabushiki Kaisha Komatsu Seisakusho Torque regulating system for fluid operated pump displacement control systems
DE3728207A1 (de) * 1987-08-24 1989-03-09 Rexroth Mannesmann Gmbh Ventilanordnung fuer zwei von einem gemeinsamen antrieb angetriebene leistungsgeregelte pumpen
US5468126A (en) * 1993-12-23 1995-11-21 Caterpillar Inc. Hydraulic power control system
US5525043A (en) * 1993-12-23 1996-06-11 Caterpillar Inc. Hydraulic power control system
US6305419B1 (en) 2000-07-14 2001-10-23 Clark Equipment Company Variable pilot pressure control for pilot valves
US20060071022A1 (en) * 2002-11-04 2006-04-06 Graco Minnesota Inc. Fast set material proportioner
US7165397B2 (en) 2003-11-10 2007-01-23 Timberjack, Inc. Anti-stall pilot pressure control system for open center systems
US20080122195A1 (en) * 2006-11-28 2008-05-29 Illinois Tool Works Inc. Auxiliary service pack for a work vehicle
US20090196767A1 (en) * 2008-02-04 2009-08-06 Illinois Tool Works Inc. Service pack variable displacement pump
US20090194067A1 (en) * 2008-02-04 2009-08-06 Illinois Tool Works Inc. Service pack power management
US20090193800A1 (en) * 2008-02-04 2009-08-06 Illinois Tool Works Inc. Service pack tandem pump
US20090218327A1 (en) * 2008-02-29 2009-09-03 Illinois Tool Works Inc. Hydraulically driven tool system
US20090218173A1 (en) * 2008-02-29 2009-09-03 Illinois Tool Works Inc. Aerial Work Platform with Compact Air Compressor
US20110056192A1 (en) * 2009-09-10 2011-03-10 Robert Weber Technique for controlling pumps in a hydraulic system
US8506267B2 (en) 2007-09-10 2013-08-13 Schlumberger Technology Corporation Pump assembly
US8606451B2 (en) 2010-10-06 2013-12-10 Caterpillar Global Mining Llc Energy system for heavy equipment
US8626403B2 (en) 2010-10-06 2014-01-07 Caterpillar Global Mining Llc Energy management and storage system
US8718845B2 (en) 2010-10-06 2014-05-06 Caterpillar Global Mining Llc Energy management system for heavy equipment
US9190852B2 (en) 2012-09-21 2015-11-17 Caterpillar Global Mining Llc Systems and methods for stabilizing power rate of change within generator based applications
US11421673B2 (en) 2016-09-02 2022-08-23 Halliburton Energy Services, Inc. Hybrid drive systems for well stimulation operations

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DE2727555A1 (de) * 1977-06-18 1979-01-04 Bosch Gmbh Robert Steuervorrichtung fuer hydrostatische verdraengeraggregate
SE435750B (sv) * 1979-06-15 1984-10-15 Akermans Verkstad Ab Anordning for begrensning av fran ett hydraulaggregat uttagen effekt
DE3706117A1 (de) * 1987-02-25 1988-09-08 Linde Ag Steuer- und regeleinrichtung fuer ein antriebsaggregat
DE102006020441B4 (de) * 2006-05-03 2017-01-26 Bucyrus Hex Gmbh Verfahren zur Lastminderung eines oder mehrerer Motore in einem Groß-Hydraulikbagger
DE102009025707B4 (de) * 2009-06-20 2021-06-02 Robert Bosch Gmbh Vorrichtung zur Steuerung einer Anlage mit Hydraulikkreisen

Citations (4)

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Publication number Priority date Publication date Assignee Title
US3350881A (en) * 1966-01-13 1967-11-07 Delavan Mfg Company Constant delivery pump system
US3649134A (en) * 1969-07-04 1972-03-14 Constantin Rauch Control apparatus for limiting the power received by a plurality of adjustable hydraulic pumps
US3695783A (en) * 1969-12-03 1972-10-03 Ingebret Soyland Means for regulating power for pumps
US3732036A (en) * 1971-03-24 1973-05-08 Caterpillar Tractor Co Summing valve arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350881A (en) * 1966-01-13 1967-11-07 Delavan Mfg Company Constant delivery pump system
US3649134A (en) * 1969-07-04 1972-03-14 Constantin Rauch Control apparatus for limiting the power received by a plurality of adjustable hydraulic pumps
US3695783A (en) * 1969-12-03 1972-10-03 Ingebret Soyland Means for regulating power for pumps
US3732036A (en) * 1971-03-24 1973-05-08 Caterpillar Tractor Co Summing valve arrangement

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3988892A (en) * 1974-11-19 1976-11-02 Robert Bosch G.M.B.H. Regulating arrangement for hydraulic pumps
US4032260A (en) * 1975-02-12 1977-06-28 Robert Bosch G.M.B.H. Hydraulic control device
US4158529A (en) * 1975-02-12 1979-06-19 Robert Bosch Gmbh Control device for a pumping arrangement
US3952515A (en) * 1975-02-20 1976-04-27 Caterpillar Tractor Co. Speed and load responsive underspeed actuator for hydrostatic transmissions
US4008004A (en) * 1975-12-22 1977-02-15 Abex Corporation Control system for variable displacement pumps
US4017219A (en) * 1975-12-22 1977-04-12 Abex Corporation Control system for variable displacement pumps
US4029439A (en) * 1975-12-22 1977-06-14 Abex Corporation Control system for variable displacement pumps
US3999892A (en) * 1976-02-09 1976-12-28 Caterpillar Tractor Co. Interconnected pump control means of a plurality of pumps
US4212596A (en) * 1978-02-23 1980-07-15 Caterpillar Tractor Co. Pressurized fluid supply system
US4395199A (en) * 1979-10-15 1983-07-26 Hitachi Construction Machinery Co., Ltd. Control method of a system of internal combustion engine and hydraulic pump
WO1981001031A1 (fr) * 1979-10-15 1981-04-16 Hitachi Construction Machinery Procede de commande d'un systeme de moteur a combustion interne et de pompe hydraulique
WO1982001396A1 (en) * 1980-10-09 1982-04-29 Izumi Eiki Method and apparatus for controlling a hydraulic power system
JPS57171042A (en) * 1981-04-15 1982-10-21 Hitachi Constr Mach Co Ltd Control system for series including internal-combustion engine and hydraulic pump
JPS57173533A (en) * 1981-04-16 1982-10-25 Hitachi Constr Mach Co Ltd Controller of device containing internal combustion engine and oil hydraulic pump
US4600364A (en) * 1983-06-20 1986-07-15 Kabushiki Kaisha Komatsu Seisakusho Fluid operated pump displacement control system
US4637781A (en) * 1984-03-30 1987-01-20 Kabushiki Kaisha Komatsu Seisakusho Torque regulating system for fluid operated pump displacement control systems
DE3728207A1 (de) * 1987-08-24 1989-03-09 Rexroth Mannesmann Gmbh Ventilanordnung fuer zwei von einem gemeinsamen antrieb angetriebene leistungsgeregelte pumpen
US5468126A (en) * 1993-12-23 1995-11-21 Caterpillar Inc. Hydraulic power control system
US5525043A (en) * 1993-12-23 1996-06-11 Caterpillar Inc. Hydraulic power control system
US6305419B1 (en) 2000-07-14 2001-10-23 Clark Equipment Company Variable pilot pressure control for pilot valves
US20060071022A1 (en) * 2002-11-04 2006-04-06 Graco Minnesota Inc. Fast set material proportioner
US8568104B2 (en) 2002-11-04 2013-10-29 Graco Minnesota Inc. Fast set material proportioner
US7165397B2 (en) 2003-11-10 2007-01-23 Timberjack, Inc. Anti-stall pilot pressure control system for open center systems
US20080122195A1 (en) * 2006-11-28 2008-05-29 Illinois Tool Works Inc. Auxiliary service pack for a work vehicle
US7870915B2 (en) 2006-11-28 2011-01-18 Illinois Tool Works Inc. Auxiliary service pack for a work vehicle
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Also Published As

Publication number Publication date
JPS5037001A (OSRAM) 1975-04-07
DE2331617A1 (de) 1975-01-16
FR2234799A5 (OSRAM) 1975-01-17

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