US3856436A - Power transmission - Google Patents

Power transmission Download PDF

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Publication number
US3856436A
US3856436A US00315945A US31594572A US3856436A US 3856436 A US3856436 A US 3856436A US 00315945 A US00315945 A US 00315945A US 31594572 A US31594572 A US 31594572A US 3856436 A US3856436 A US 3856436A
Authority
US
United States
Prior art keywords
restrictor
pump
pressure
pilot
adjustable orifice
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00315945A
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English (en)
Inventor
K Lonnemo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vickers Inc
Original Assignee
Sperry Rand Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sperry Rand Corp filed Critical Sperry Rand Corp
Priority to US00315945A priority Critical patent/US3856436A/en
Priority to CA180,910A priority patent/CA983314A/en
Priority to AU60289/73A priority patent/AU473650B2/en
Priority to IT52924/73A priority patent/IT996264B/it
Priority to DE19732350390 priority patent/DE2350390A1/de
Priority to FR7338681A priority patent/FR2211054A5/fr
Priority to JP48127638A priority patent/JPS589276B2/ja
Priority to GB5706473A priority patent/GB1383490A/en
Priority to SE7317029A priority patent/SE383190B/xx
Application granted granted Critical
Publication of US3856436A publication Critical patent/US3856436A/en
Assigned to SPERRY CORPORATION reassignment SPERRY CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SPERRY RAND CORPORATION
Assigned to VICKERS, INCORPORATED reassignment VICKERS, INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SPERRY CORPORATION A DE CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04B49/08—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
    • F04B2205/00—Fluid parameters
    • F04B2205/08—Pressure difference over a throttle

Definitions

  • ABSTRACT A pilot operated load compensated variable displacement pump is controlled by a servomotor and a pilot valve to maintain a constant pressure drop across an [52] US Cl. 417/212, 60/450 adjustable orifice in the pump delivery line. The avail- [51] Int. Cl.
  • F04b 1/00 able pressure differential for operating the pilot valve [58] Field of Search 417/213, 218, 220, 221, is increased without increasing the pressure drop in 417/222; 91/506; 60/450 the main flow through the adjustable orifice by providing a small restrictor in the operating line to the pilot [56] References Cited valve and establishing a continuous bleed flow through IT STATES PATENTS that restrictor to establish a large pressure differential 2 255 783 9H9 Kendrick 60,450 supplementing that at the adjustable orifice in the 3 6/1959 Van 60/450 main pump delivery line. The bleed is established 3,067,693 12/1962 Lambeck 1.
  • the present invention aims to provide an improved load compensated variable displacement pump in which the available pressure for operating the regulator is high, while the pressure drop through the adjustable orifice in the main delivery line is a low one, and thus throttling losses in the main power flow are minimized.
  • a pilot operated, load compensated, variable displacement pump for maintaining a predetermined pressure drop across an adjustable orifice which comprises a servomotor for adjusting the pump displacement, a pilot valve for controlling the servomotor, a connection from the pump output ahead of the adjustable orifice for urging the pilot valve toward a position of lesser pump displacement, a connection from the pump output beyond the adjustable orifice for urging the pilot valve toward a position of greater pump displacement, a restrictor in the second connection, and a bleed restriction from the restrictor to maintain a small continuous flow therethrough sufficient to create a pressure drop through the restrictor several times as great as the pressure drop through the adjustable orifice under steady state conditions, whereby a large pressure differential for operating the pilot valve is available without imposing a large pressure drop in the main flow through the adjustable orifice.
  • FIG. 1 represents a hydraulic circuit diagram of a pump and control system incorporating a preferred form of the present invention.
  • FIG. 2 represents a modified form of the present invention.
  • a variable displacement pump has a servomotor 12 for adjusting its displacement and feeds its output into a delivery line 14.
  • the delivery line 14 leads through an adjustable orifice 16 to a fluid utilization device 18.
  • the adjustable orifice 16 is representative of many types of valves which control the rate of flow to the fluid utilization device, such as one or more fluid motors. In many systems, of which this is typical, the adjustable orifice 16 may comprise a conventional four-way reverse valve.
  • the servomotor 12 is controlled by a three-way pilot valve 20 which can supply fluid to the servomotor 12 from the supply line through a branch 22 or can exhaust fluid from the servomotor through an exhaust line 24.
  • the pilot valve 20 is urged to the left against a spring 26 by delivery line pressure directed through a brnach 28.
  • Also acting on the pilot valve 20 in opposition to delivery line pressure is a lower pressure derived from the delivery line after passing through the adjustable orifice 16 and a fixed orifice 30. This pressure is transmitted through a branch 32.
  • a continuous bleed flow through the'restrictor 30 is established by a branch 34 containing a pressure compensated flow control valve 36 feeding into the exhaust line 24.
  • a pilot relief valve 38 is connected as an additional possible bleed from the orifice 30 through a branch 40.
  • pilot relief valve 38 Whenever the system pressure rises above a predetermined limit, the pilot relief valve 38 will open, causing a further bleed flow through the orifice 30, thus dropping the pressure in conduit 32 and allowing pilot valve 20 to shift to the left and reduce the pump displacement until the pressure overload has ceased.
  • the pressure available for operating pilot valve 20 is theoretically the sum of the pressure drops through adjustable orifice 16 and restrictor 30. By making the latter pressure drop relatively high, say five times as high as the former pressure drop, it will be seen that effective control of the pilot valve 20 is maintained without imposing a large pressure drop through the adjustable orifice 16. In this way, substantial power losses in the main flow line are avoided.
  • a special pilot relief valve 42 is provided to take the place of the flow control valve 36 and the pilot relief valve 38 together.
  • the inner spring 44 of the relief valve poppet is adjusted automatically by means of a piston 46 having a diameter equal to the seat diameter of the poppet.
  • a head 48 limits the stroke of piston 46 and a branch line 50 connects the piston 46 to a point ahead of the restrictor 30.
  • An auxiliary spring 52 aids in biasing the piston 46 against this pressure.
  • a pilot operated load compensated variable displacement pump for maintaining a predetermined pressure drop across an adjustable orifice comprising a servomotor for adjusting the pump displacement, a pilot valve for controlling the servomotor, a connection from the pump output ahead of the adjustable orifice for urging the pilot valve toward a position of lesser pump displacement, a second connection from the pump output beyond the adjustable orifice for urging the pilot valve toward a position of greater displacement, a restrictor in the second connection and a bleed restriction comprising a pressure responsive flow regulator from the restrictor to maintain a small and fixed continuous flow therethrough independent of system pressure and sufficient to create a pressure drop through the restrictor several times as great as the pressure drop through the adjustable orifice under steady state conditions, whereby a large pressure differential for operating the pilot valve is available without imposing a large pressure drop in the main flow through the adjustable orifice.
  • a pump as defined in claim 1 wherein the flow regulator comprises an additional restrictor and a compensator for maintaining a constant pressure drop across the additional restrictor.
  • a pump as defined in claim 1 which includes a pilot relief valve connected to the restrictor to limit the maximum pump output pressure.
  • a pump as defined in claim 2 having a pilot relief valve connected to the first restrictor to limit the maxi mum pump output pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Fluid Gearings (AREA)
US00315945A 1972-12-18 1972-12-18 Power transmission Expired - Lifetime US3856436A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US00315945A US3856436A (en) 1972-12-18 1972-12-18 Power transmission
CA180,910A CA983314A (en) 1972-12-18 1973-09-13 Variable displacement hydraulic pump
AU60289/73A AU473650B2 (en) 1972-12-18 1973-09-13 Pilot operated load compensated variable displacement pump
IT52924/73A IT996264B (it) 1972-12-18 1973-10-04 Perfezionamento nelle disposizioni di pompa a portata variabile per sistemi idraulici
DE19732350390 DE2350390A1 (de) 1972-12-18 1973-10-08 Lastkompensierte pumpe mit variabler verdraengung
FR7338681A FR2211054A5 (enrdf_load_stackoverflow) 1972-12-18 1973-10-30
JP48127638A JPS589276B2 (ja) 1972-12-18 1973-11-13 パイロット作動負荷補償可変容量ポンプ
GB5706473A GB1383490A (en) 1972-12-18 1973-12-10 Pumps
SE7317029A SE383190B (sv) 1972-12-18 1973-12-17 Belastningskompenserad pump med variabelt deplacement.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00315945A US3856436A (en) 1972-12-18 1972-12-18 Power transmission

Publications (1)

Publication Number Publication Date
US3856436A true US3856436A (en) 1974-12-24

Family

ID=23226784

Family Applications (1)

Application Number Title Priority Date Filing Date
US00315945A Expired - Lifetime US3856436A (en) 1972-12-18 1972-12-18 Power transmission

Country Status (9)

Country Link
US (1) US3856436A (enrdf_load_stackoverflow)
JP (1) JPS589276B2 (enrdf_load_stackoverflow)
AU (1) AU473650B2 (enrdf_load_stackoverflow)
CA (1) CA983314A (enrdf_load_stackoverflow)
DE (1) DE2350390A1 (enrdf_load_stackoverflow)
FR (1) FR2211054A5 (enrdf_load_stackoverflow)
GB (1) GB1383490A (enrdf_load_stackoverflow)
IT (1) IT996264B (enrdf_load_stackoverflow)
SE (1) SE383190B (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS525864A (en) * 1975-06-28 1977-01-17 Hehl Karl Controlling system for hydraulic pressure circuit of injection molder
US4067664A (en) * 1974-12-31 1978-01-10 Robert Bosch Gmbh Control system for a pump
US4118149A (en) * 1976-02-05 1978-10-03 Hytec Ab Output regulation in hydraulic and hydropneumatic systems
US4123202A (en) * 1975-11-04 1978-10-31 Plessey Handel Und Investments Ag Hydraulic pumping arrangements
US4194364A (en) * 1977-05-21 1980-03-25 Robert Bosch Gmbh Arrangement for controlling the operation of a fluid-displacement machine
US4194363A (en) * 1979-02-21 1980-03-25 General Signal Corporation Fluid horsepower control system
JPS5554701A (en) * 1978-09-28 1980-04-22 Eaton Corp Loaddresponsible controller for hydraulic system
US4292805A (en) * 1979-09-24 1981-10-06 Rexnord Inc. Servo-valve convertible construction
JPS61204002U (enrdf_load_stackoverflow) * 1986-05-14 1986-12-22
JPS62801U (enrdf_load_stackoverflow) * 1986-05-14 1987-01-07
US4976106A (en) * 1988-02-18 1990-12-11 Linde Aktiengesellschaft Load-sensing variable displacement pump controller with adjustable pressure-compensated flow control valve in feedback path
US5203678A (en) * 1990-01-11 1993-04-20 Hitachi Construction Machinery Co., Ltd. Valve apparatus and hydraulic drive system
US5319932A (en) * 1993-04-28 1994-06-14 Roche Engineering Corporation Power sensing regenerator
GB2279776A (en) * 1993-05-28 1995-01-11 Dana Corp A hydraulic load sensing system
EP0869285A3 (de) * 1997-04-04 1999-09-22 Brueninghaus Hydromatik Gmbh Lastdruckgeführter Förderstromregler mit Spülkreislauf
US20050047930A1 (en) * 2002-03-06 2005-03-03 Johannes Schmid System for controlling a hydraulic variable-displacement pump
CN103982475A (zh) * 2014-05-30 2014-08-13 湖南五新重型装备有限公司 一种混凝土喷射车臂架液压控制系统
US20160003237A1 (en) * 2013-03-27 2016-01-07 Kayaba Industry Co., Ltd. Pump discharge flow-rate control device

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941513A (en) * 1974-09-05 1976-03-02 Parker-Hannifin Corporation Variable displacement pump control assembly
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
DE2840687A1 (de) * 1978-09-19 1980-04-03 Bosch Gmbh Robert Einrichtung zur regelung des foerderstroms und zur begrenzung des foerderdrucks einer verstellbaren pumpe.
DE2906166A1 (de) * 1979-02-17 1980-08-28 Bosch Gmbh Robert Einrichtung zur regelung des foerderstroms und zur begrenzung des foerderdrucks einer verstellbaren pumpe
DE3016609A1 (de) * 1980-04-30 1981-11-05 G.L. Rexroth Gmbh, 8770 Lohr Vorrichtung zum regeln der foerdermenge einer pumpe
DE3027819A1 (de) * 1980-07-23 1982-02-25 Backe, Wolfgang, Prof.Dr.-Ing., 5100 Aachen Vorrichtung zur regelung einer verstellpumpe
DE3146513A1 (de) * 1980-11-24 1982-06-24 Linde Ag, 6200 Wiesbaden Steuereinrichtung fuer ein hydrostatisches antriebssystem
DE3044143A1 (de) * 1980-11-24 1982-06-24 Linde Ag, 6200 Wiesbaden Steuereinrichtung fuer ein hydrostatisches antriebssystem
DE3112561C2 (de) * 1981-03-30 1985-09-26 Danfoss A/S, Nordborg Steuervorrichtung für eine Flüssigkeitspumpe mit verstellbarem Fördervolumen
DE3129440A1 (de) * 1981-07-25 1983-02-10 Mannesmann Rexroth GmbH, 8770 Lohr Regeleinrichtung fuer eine verstellpumpe
DE3211307A1 (de) * 1982-03-26 1983-09-29 Linde Ag, 6200 Wiesbaden Einstellbare axialkolbenpumpe mit einem regelorgan und regelorgan fuer solche
DE3345264A1 (de) * 1983-12-14 1985-06-27 Brueninghaus Hydraulik Gmbh, 7240 Horb Drehmomenten-regeleinrichtung fuer eine verstellbare hydropumpe
DE3622939A1 (de) * 1986-07-08 1988-01-14 Linde Ag Hydraulische steuer- oder regeleinrichtung
DE3844398C2 (de) * 1988-12-30 1997-07-31 Rexroth Mannesmann Gmbh Hydraulische Schaltung für eine Verstellpumpe
DE8906826U1 (de) * 1989-06-03 1989-09-07 Keicher, Siegfried, 7906 Blaustein Hydraulische Regeleinrichtung zur Regelung einer Regelpumpe für den Antrieb eines Hydraulikmotors
DE4025638C1 (enrdf_load_stackoverflow) * 1990-08-13 1991-12-05 Brueninghaus Hydraulik Gmbh, 7240 Horb, De
DE4337210A1 (de) * 1993-10-30 1995-05-04 Rexroth Mannesmann Gmbh Zentralhydraulikanlage für ein Kraftfahrzeug

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255783A (en) * 1940-02-17 1941-09-16 Manly Corp Fluid pressure device and system
US2892311A (en) * 1958-01-08 1959-06-30 Deere & Co Hydraulic apparatus
US3067693A (en) * 1958-12-24 1962-12-11 United Aircraft Corp Control means for variable delivery pump
US3188971A (en) * 1962-08-13 1965-06-15 Bendix Corp Control system for a pump
US3246471A (en) * 1964-12-10 1966-04-19 Ford Motor Co Hydraulic drive control
US3444689A (en) * 1967-02-02 1969-05-20 Weatherhead Co Differential pressure compensator control
US3635021A (en) * 1969-10-16 1972-01-18 Borg Warner Hydraulic system
US3644063A (en) * 1969-04-05 1972-02-22 Bosch Gmbh Robert Regulated hydraulic apparatus
US3768928A (en) * 1971-06-01 1973-10-30 Borg Warner Pump control system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255783A (en) * 1940-02-17 1941-09-16 Manly Corp Fluid pressure device and system
US2892311A (en) * 1958-01-08 1959-06-30 Deere & Co Hydraulic apparatus
US3067693A (en) * 1958-12-24 1962-12-11 United Aircraft Corp Control means for variable delivery pump
US3188971A (en) * 1962-08-13 1965-06-15 Bendix Corp Control system for a pump
US3246471A (en) * 1964-12-10 1966-04-19 Ford Motor Co Hydraulic drive control
US3444689A (en) * 1967-02-02 1969-05-20 Weatherhead Co Differential pressure compensator control
US3644063A (en) * 1969-04-05 1972-02-22 Bosch Gmbh Robert Regulated hydraulic apparatus
US3635021A (en) * 1969-10-16 1972-01-18 Borg Warner Hydraulic system
US3768928A (en) * 1971-06-01 1973-10-30 Borg Warner Pump control system

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067664A (en) * 1974-12-31 1978-01-10 Robert Bosch Gmbh Control system for a pump
JPS525864A (en) * 1975-06-28 1977-01-17 Hehl Karl Controlling system for hydraulic pressure circuit of injection molder
US4123202A (en) * 1975-11-04 1978-10-31 Plessey Handel Und Investments Ag Hydraulic pumping arrangements
US4118149A (en) * 1976-02-05 1978-10-03 Hytec Ab Output regulation in hydraulic and hydropneumatic systems
US4194364A (en) * 1977-05-21 1980-03-25 Robert Bosch Gmbh Arrangement for controlling the operation of a fluid-displacement machine
JPS5554701A (en) * 1978-09-28 1980-04-22 Eaton Corp Loaddresponsible controller for hydraulic system
US4194363A (en) * 1979-02-21 1980-03-25 General Signal Corporation Fluid horsepower control system
US4292805A (en) * 1979-09-24 1981-10-06 Rexnord Inc. Servo-valve convertible construction
JPS61204002U (enrdf_load_stackoverflow) * 1986-05-14 1986-12-22
JPS62801U (enrdf_load_stackoverflow) * 1986-05-14 1987-01-07
US4976106A (en) * 1988-02-18 1990-12-11 Linde Aktiengesellschaft Load-sensing variable displacement pump controller with adjustable pressure-compensated flow control valve in feedback path
US5203678A (en) * 1990-01-11 1993-04-20 Hitachi Construction Machinery Co., Ltd. Valve apparatus and hydraulic drive system
US5319932A (en) * 1993-04-28 1994-06-14 Roche Engineering Corporation Power sensing regenerator
WO1994025770A3 (en) * 1993-04-28 1995-01-12 Roche Eng Corp Power sensing regenerator
AU677395B2 (en) * 1993-04-28 1997-04-24 Roche Engineering Corporation Power sensing regenerator
GB2279776A (en) * 1993-05-28 1995-01-11 Dana Corp A hydraulic load sensing system
GB2279776B (en) * 1993-05-28 1997-09-24 Dana Corp Hydraulic load sensing system
EP0869285A3 (de) * 1997-04-04 1999-09-22 Brueninghaus Hydromatik Gmbh Lastdruckgeführter Förderstromregler mit Spülkreislauf
US20050047930A1 (en) * 2002-03-06 2005-03-03 Johannes Schmid System for controlling a hydraulic variable-displacement pump
US20160003237A1 (en) * 2013-03-27 2016-01-07 Kayaba Industry Co., Ltd. Pump discharge flow-rate control device
CN103982475A (zh) * 2014-05-30 2014-08-13 湖南五新重型装备有限公司 一种混凝土喷射车臂架液压控制系统
CN103982475B (zh) * 2014-05-30 2016-03-02 湖南五新隧道智能装备股份有限公司 一种混凝土喷射车臂架液压控制系统

Also Published As

Publication number Publication date
AU473650B2 (en) 1976-07-01
FR2211054A5 (enrdf_load_stackoverflow) 1974-07-12
SE383190B (sv) 1976-03-01
DE2350390C3 (enrdf_load_stackoverflow) 1979-08-30
DE2350390A1 (de) 1974-07-04
AU6028973A (en) 1975-03-13
CA983314A (en) 1976-02-10
IT996264B (it) 1975-12-10
JPS589276B2 (ja) 1983-02-19
JPS4989202A (enrdf_load_stackoverflow) 1974-08-26
GB1383490A (en) 1974-02-12
DE2350390B2 (enrdf_load_stackoverflow) 1979-01-11

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SPERRY CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:SPERRY RAND CORPORATION;REEL/FRAME:003794/0122

Effective date: 19790824

AS Assignment

Owner name: VICKERS, INCORPORATED TROY, MI A DE CORP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE NOVEMBER 2, 1983;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889

Effective date: 19831102

Owner name: VICKERS, INCORPORATED,MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889

Effective date: 19831102