GB1515757A - Control apparatus for an adjustable displacement pump - Google Patents

Control apparatus for an adjustable displacement pump

Info

Publication number
GB1515757A
GB1515757A GB50502/75A GB5050275A GB1515757A GB 1515757 A GB1515757 A GB 1515757A GB 50502/75 A GB50502/75 A GB 50502/75A GB 5050275 A GB5050275 A GB 5050275A GB 1515757 A GB1515757 A GB 1515757A
Authority
GB
United Kingdom
Prior art keywords
pump
valve
pressure
line
speed
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
GB50502/75A
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 GB1515757A publication Critical patent/GB1515757A/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
    • 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
    • F04B49/002—Hydraulic systems to change the pump delivery
    • 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
    • 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
    • F04B1/08—Control regulated 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
    • F04B49/08—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
    • F04B49/12—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

1515757 Fluid-pressure servomotor systems ROBERT BOSCH GmbH 9 Dec 1975 [17 Dec 1974] 50502/75 Heading G3P The output of a pump 11 is adjusted by pistons 15, 16, the larger of which is controlled by a valve 28 responsive to speed dependant pressure from an auxiliary pump 33 driven from the same source as the pump 11, the valve 11 having its movement opposed by the pressure in an accumulator 39 charged from the auxiliary pump through a non- return valve 40 and having means to permit fluid from the accumulator to flow into a return line 30. On increased load, the speed of pump 33 falls allowing the valve 28 to connect the piston 15 to a return line 47 and reduce the output of pump 11 so as to avoid stalling. If pump 33 runs at a lower speed for a long period, fluid in the accumulator leaks into the line 47 through a clearance surrounding a flange 42 so that the valve 28 is moved to again throttle communication between the piston 15 and the line 47 and restore delivery from the pump 11. The latter is also controlled by a pressure responsive valve 22. The fall in speed necessary to operate the valve 28 for stall prevention may be made the same for all speeds of operation by replacing a fixed throttle 35 with a variable throttle (54) Fig. 2 (not shown), responsive to pressure in the line 34.
GB50502/75A 1974-12-17 1975-12-09 Control apparatus for an adjustable displacement pump Expired GB1515757A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742459550 DE2459550A1 (en) 1974-12-17 1974-12-17 CONTROL DEVICE FOR AN ADJUSTABLE PUMP

Publications (1)

Publication Number Publication Date
GB1515757A true GB1515757A (en) 1978-06-28

Family

ID=5933603

Family Applications (1)

Application Number Title Priority Date Filing Date
GB50502/75A Expired GB1515757A (en) 1974-12-17 1975-12-09 Control apparatus for an adjustable displacement pump

Country Status (2)

Country Link
DE (1) DE2459550A1 (en)
GB (1) GB1515757A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2551088C2 (en) * 1975-11-14 1984-06-28 Mannesmann Rexroth GmbH, 8770 Lohr Device for volume and pressure control for variable displacement pumps
DE3001167A1 (en) * 1980-01-15 1981-07-16 G.L. Rexroth Gmbh, 8770 Lohr DEVICE FOR CONTROLLING A HYDROMOTOR
DE3247004C2 (en) * 1982-12-18 1985-06-20 Danfoss A/S, Nordborg Hydrostatic transmission, in particular for vehicle propulsion

Also Published As

Publication number Publication date
DE2459550A1 (en) 1976-07-01

Similar Documents

Publication Publication Date Title
GB1482947A (en) System for the combined control of an internal combustion engine and a hydrostatic transmission connected thereto
GB1475296A (en) Fuel injection pumping apparatus
GB1387491A (en) Variable displacement piston pumps or motors
GB1518735A (en) Control apparatus for a pump
ES413538A1 (en) Variable pressure hydraulic system
GB1401374A (en) Apparatus for damping the pressure increase of hydrostatic drives
GB1347056A (en) Power control device for two or more hydraulic pumps
GB1439193A (en) Noise reduction apparatus and method
GB1466528A (en) Piston pump
GB1469355A (en) Hydraulic control device
GB528950A (en) Improvements in and relating to means for automatically regulating a working machine
GB1467706A (en) Control system for a variable pump or motor
GB1515757A (en) Control apparatus for an adjustable displacement pump
GB1408814A (en) Control system for a hydrostartic transmission
GB990053A (en) A method of and device for the regulation of hydraulic motors
GB1168867A (en) Improvements in Motor Driven Hydraulic Pump Control Systems
GB1315064A (en) Hydraulic control system for a variable displacement pump supplied by a feed pump
GB928657A (en) Hydraulic transmission with low speed slip compensation
GB1482571A (en) Hydrostatic transmission
GB1452471A (en) Hydraulic servomotor
GB1472625A (en) Automatic torque limitation control for a variable-d-splacement pump
GB1085176A (en) Hydrostatic transmission
GB1292219A (en) Improvements in governors for fuel injection pumps
GB1263339A (en) Fluid-pressure control system for regulating the operation of machines
GB1002332A (en) Self regulating variable flow pumps

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]