GB1344623A - Variable displacement pumps and motors - Google Patents

Variable displacement pumps and motors

Info

Publication number
GB1344623A
GB1344623A GB1344623DA GB1344623A GB 1344623 A GB1344623 A GB 1344623A GB 1344623D A GB1344623D A GB 1344623DA GB 1344623 A GB1344623 A GB 1344623A
Authority
GB
United Kingdom
Prior art keywords
servomotor
piston
valve
valves
pump
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
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.)
Dowty Technical Developments Ltd
Original Assignee
Dowty Technical Developments Ltd
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 Dowty Technical Developments Ltd filed Critical Dowty Technical Developments Ltd
Publication of GB1344623A publication Critical patent/GB1344623A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)

Abstract

1344623 Fluid-pressure servomotor systems DOWTY TECHNICAL DEVELOPMENTS Ltd 21 April 1971 [9 May 1970] 22498/70 Heading G3P [Also in Division F1] A variable-displacement pump or motor 1, e.g. of swash-plate type, is controlled by a hydraulic servomotor 3, the cylinder 5 of which has parts 16, 17, 18 connected to reservoir 8 and controlled by the servomotor piston 6 to arrest the movement of the servomotor piston at selected part positions according to the setting of valves 14, 19 and 21. In the pump embodiment shown, pump delivery pressure in line 9 is supplied to the servomotor via restriction 12 and line 13. With valve 14 open, line 13 is connected to reservoir 8 and piston 6 remains in its minimum displacement position shown. With valve 14 closed and valve 19 open, delivery pressure moves piston 6 to the left until it opens port 16, which vents the working space and arrests the piston. Closing valves 14 and 19 and opening valve 21 causes piston 6 to move to port 17, and closing valve 21 causes the piston to move to its maximum displacement position at port 1#. The displacement-control member 2 is biased by the swash-plate, or a spring, towards its minimum displacement setting. In Fig.2 (not shown), a relay valve is remotely, hydraulically controlled by selector valves corresponding with valves 14, 19, 21, to control ports in the servomotor cylinder corresponding with ports 16, 17, 18. The selector valves are operatively connected to valves for connecting the pump delivery to various loads requiring different pump outputs. The servomotor may include a control unit for automatically adjusting the servomotor setting to maintain a predetermined pump output or driving torque.
GB1344623D 1970-05-09 1971-04-21 Variable displacement pumps and motors Expired GB1344623A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2249870 1970-05-09

Publications (1)

Publication Number Publication Date
GB1344623A true GB1344623A (en) 1974-01-23

Family

ID=10180373

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1344623D Expired GB1344623A (en) 1970-05-09 1971-04-21 Variable displacement pumps and motors

Country Status (3)

Country Link
JP (1) JPS5244041B1 (en)
DE (1) DE2123031A1 (en)
GB (1) GB1344623A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005012693A1 (en) * 2003-07-30 2005-02-10 Lincoln Industrial Corporation Controlled gas bleed system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6273796U (en) * 1985-10-26 1987-05-12
DE3600787C1 (en) * 1986-01-14 1987-04-02 Danfoss As Control unit for a pump with adjustable delivery rate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005012693A1 (en) * 2003-07-30 2005-02-10 Lincoln Industrial Corporation Controlled gas bleed system
US6901841B2 (en) 2003-07-30 2005-06-07 Lincoln Industrial Corporation Gas bleed system with improved control

Also Published As

Publication number Publication date
JPS5244041B1 (en) 1977-11-04
DE2123031A1 (en) 1972-10-26

Similar Documents

Publication Publication Date Title
US3540349A (en) Fluid-operated continuously actuated reciprocating piston drive
GB1412659A (en) Valves
GB1528938A (en) Hydraulic control valves
US3747351A (en) Hydraulic system
GB1220727A (en) Control response valve for hydrostatic transmission
GB1369742A (en) Power boost mechanism
GB1418793A (en) Hydraulic power transmission systems
GB1297761A (en)
US4013380A (en) Control systems for variable capacity hydraulic machines
GB1344623A (en) Variable displacement pumps and motors
GB1362664A (en) Valves for fluids
GB1465714A (en) Motor vehicle open centre series hydraulic circuit
GB1267461A (en) Hydraulic control apparatus for driving a drivable member
GB1527255A (en) Hydraulic control valves
US3732785A (en) Fluid pressure apparatus
GB1421037A (en) Valve assembly
US4742676A (en) Reversible hydrostatic transmission pump with drive engine speed control
GB1260753A (en) A fluid-pressure control system for dual motors
GB1314127A (en) Control of fluid operated pumps
GB842359A (en) Hydraulic remote control steering systems
GB1067557A (en) Improvements in or relating to automatic control apparatus for hydrostatic fan drives
GB2110309A (en) Control of continuous reciprocation of a fluid power cylinder
GB1487287A (en) Valve for controlling a reversible rotary hydraulic motor
GB1154689A (en) Four-Port Reversing Valve for Fluid Flow.
GB1262075A (en) Systems for operating internal combustion engine valves by means of fluid pressure

Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees