GB1315064A - Hydraulic control system for a variable displacement pump supplied by a feed pump - Google Patents

Hydraulic control system for a variable displacement pump supplied by a feed pump

Info

Publication number
GB1315064A
GB1315064A GB2211471A GB2211471A GB1315064A GB 1315064 A GB1315064 A GB 1315064A GB 2211471 A GB2211471 A GB 2211471A GB 2211471 A GB2211471 A GB 2211471A GB 1315064 A GB1315064 A GB 1315064A
Authority
GB
United Kingdom
Prior art keywords
pump
pressure
throttle
delivery
subjected
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
Application number
GB2211471A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1315064A publication Critical patent/GB1315064A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/02—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for several machines or pumps connected in series or in 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
    • F04B49/007—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

Abstract

1315064 Controlling pumps ROBERT BOSCH GmbH 19 April 1971 [3 July 1970] 22114/71 Heading F1A A variable displacement pump 1 is supplied by a feed pump 2 driven at the same speed as pump 1 and of greater delivery volume than pump 1, the excess delivery being by-passed to a reservoir 19 by a spring-loaded pressure relief valve controlled by both the output pressure of the feed pump and the differential pressure across a throttle 4 in the delivery line 3 from pump 1, so that the feed pressure increases with increasing speed and pump 1 is completely filled. In Fig. 1, pressure relief valve 13 comprises a spool 12 connected to a control piston 8 subjected on either side to the pressures upstream and downstream of throttle 4, the spool 12 being loaded by spring 15 and subjected to feed pump output pressure in chamber 16'. In Fig. 2, a pilot valve 26 is controlled by piston 33 subjected to the differential pressure across throttle 4, such that increasing delivery from pump 1 producing an increasing pressure differential across throttle 4 causes piston 33 to open valve member 31 to connect line 28 to reservoir 19 via line 36, pressure relief valve 25 then being subjected to the pressure differential across throttle 39 and being opened against spring 40 by the pressure in line 38 to by-pass the feed pump delivery to reservoir 19.
GB2211471A 1970-07-03 1971-04-19 Hydraulic control system for a variable displacement pump supplied by a feed pump Expired GB1315064A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702033053 DE2033053A1 (en) 1970-07-03 1970-07-03 Control device for positive displacement pump

Publications (1)

Publication Number Publication Date
GB1315064A true GB1315064A (en) 1973-04-26

Family

ID=5775756

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2211471A Expired GB1315064A (en) 1970-07-03 1971-04-19 Hydraulic control system for a variable displacement pump supplied by a feed pump

Country Status (6)

Country Link
US (1) US3912419A (en)
JP (1) JPS493401B1 (en)
CH (1) CH525395A (en)
DE (1) DE2033053A1 (en)
FR (1) FR2097177B1 (en)
GB (1) GB1315064A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169448A (en) * 1976-06-22 1979-10-02 Lucas Industries Limited Air heater system
GB1548937A (en) * 1976-06-22 1979-07-18 Lucas Industries Ltd Air heater system
US4531359A (en) * 1983-11-04 1985-07-30 General Motors Corporation Gas turbine engine fuel system
DE3445516C1 (en) * 1984-12-13 1989-05-18 Mannesmann Rexroth GmbH, 8770 Lohr Control device for a control pump
US4662181A (en) * 1984-12-24 1987-05-05 Zwich Energy Research Organization, Inc. Method and apparatus for extending the duration of operation of a cryogenic pumping system
US5020324A (en) * 1990-03-13 1991-06-04 Deere & Company Charge flow priority circuit
US5186612A (en) * 1992-01-16 1993-02-16 Caterpillar Inc. Variable pressure inlet system for hydraulic pumps
US6772794B2 (en) 2002-01-24 2004-08-10 Seguin Carl Variable volume reservoir
US6916158B2 (en) * 2003-04-30 2005-07-12 Actuant Corporation Radial piston pump

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2604047A (en) * 1945-09-19 1952-07-22 Hulman Two-stage hydraulic pressure pump
US2709339A (en) * 1953-07-06 1955-05-31 Pacific Airmotive Corp Two-stage pumping system with automatic demand responsive control
US3002462A (en) * 1957-08-13 1961-10-03 Racine Hydraulics & Machinery Fluid translating apparatus
US3153508A (en) * 1961-08-04 1964-10-20 Gen Turbine Corp Vehicle mounted air compressor
US3515164A (en) * 1968-10-16 1970-06-02 Servoflo Corp Flow delivery system

Also Published As

Publication number Publication date
CH525395A (en) 1972-07-15
FR2097177A1 (en) 1972-03-03
JPS493401B1 (en) 1974-01-26
DE2033053A1 (en) 1972-01-05
US3912419A (en) 1975-10-14
FR2097177B1 (en) 1974-04-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees