GB1401798A - Controls for variable pumps or motors - Google Patents

Controls for variable pumps or motors

Info

Publication number
GB1401798A
GB1401798A GB3384272A GB3384272A GB1401798A GB 1401798 A GB1401798 A GB 1401798A GB 3384272 A GB3384272 A GB 3384272A GB 3384272 A GB3384272 A GB 3384272A GB 1401798 A GB1401798 A GB 1401798A
Authority
GB
United Kingdom
Prior art keywords
pressure
over
pump
ride
valves
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
GB3384272A
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.)
Advanced Products Pty Ltd
Original Assignee
Advanced Products Pty 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 Advanced Products Pty Ltd filed Critical Advanced Products Pty Ltd
Publication of GB1401798A publication Critical patent/GB1401798A/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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/10—Control of working-fluid admission or discharge peculiar thereto
    • F01B3/103—Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block
    • F01B3/106—Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block by changing the inclination of the swash plate
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity

Abstract

1401798 Fluid-pressure servomotor systems ADVANCED PRODUCTS PTY Ltd 19 July 1972 [28 July 1971] 33842/72 Heading G3P [Also in Division F2] In a hydrostatic transmission control circuit wherein pump and motor displacement adjusting follow-up servomotors 10 are each controlled by a pilot valve 11 which is normally positioned by a manual control 23 acting through a further followup servomotor 18 on the pilot valve 11, over-ride means automatically adjust the pump and/or motor displacement when the pressure in the working circuit or the driving torque exceed predetermined values and the over-ride means is rendered inoperative during over-run of the motor. As shown the manual control 23 positions a pilot valve 24 of the follow-up servomotor 18. Pressure liquid supplied by a make-up pump 6 to a chamber 19A moves the servo-piston 18 against the bias of spring 21 to follow the movement of the pilot valve 24. If the make-up pump 6 fails, the spring 21 moves the servo-piston 18 left to reduce pump or increase motor displacement. Adjustably loaded normally closed over-ride valves 25, 26 are respectively loaded by working circuit high pressure 13 and a driving torque responsive pressure 17 which may be the hydrostatic pressure balancing the journal loading at the pump. When the pressure 13 or 17 exceeds a predetermined value the valve 25 or 26 is opened to vent the chamber 19A and thus reduce pump or increase motor displacement. The working circuit return line pressure 14 is supplied to an adjustably loaded normally open valve 27 which is closed by the increased pressure in the line 14 during motor over-run to block a vent duct 15 and thus render the over-ride valves 25, 26 of ineffective. Additional over-ride valve responsive to temperature or engine speed may be provided. In Fig. 3 (not shown) the overrun pressure (14) acts on a piston (28) connected directly to the servo-piston (18) to prevent leftward movement of the latter on opening of the valves (25, 26) and thus render the over-ride valves (25, 26) ineffective.
GB3384272A 1971-07-28 1972-07-19 Controls for variable pumps or motors Expired GB1401798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPA569771 1971-07-28

Publications (1)

Publication Number Publication Date
GB1401798A true GB1401798A (en) 1975-07-30

Family

ID=3764802

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3384272A Expired GB1401798A (en) 1971-07-28 1972-07-19 Controls for variable pumps or motors

Country Status (8)

Country Link
US (1) US3847061A (en)
JP (1) JPS4835402A (en)
CA (1) CA971822A (en)
DE (1) DE2236888C3 (en)
FR (1) FR2147740A5 (en)
GB (1) GB1401798A (en)
IT (1) IT963300B (en)
SE (1) SE383556B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952514A (en) * 1975-02-20 1976-04-27 Caterpillar Tractor Co. Underspeed actuator for hydrostatic transmission
US3996743A (en) * 1975-02-20 1976-12-14 Caterpillar Tractor Co. Underspeed actuator with part throttle control
DE3321443A1 (en) * 1983-06-11 1984-12-13 Losenhausen Maschinenbau AG, 4000 Düsseldorf VIBRATION ROLLER WITH POWER LIMITATION DEVICE
JP3517817B2 (en) * 1997-02-24 2004-04-12 新キャタピラー三菱株式会社 Hydraulic pilot circuit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017750A (en) * 1959-07-13 1962-01-23 Dowty Hydraulic Units Ltd Hydraulic apparatus
US3163115A (en) * 1960-03-08 1964-12-29 American Brake Shoe Co Horsepower limiting devices
US3199286A (en) * 1962-05-16 1965-08-10 Gar Wood Ind Inc Hydrostatic drive
US3127745A (en) * 1962-07-05 1964-04-07 New York Air Brake Co Hydrostatic transmission
US3252426A (en) * 1962-08-10 1966-05-24 New York Air Brake Co Hydraulic device
US3164960A (en) * 1963-09-03 1965-01-12 New York Air Brake Co Hydrostatic transmission
JPS4527170Y1 (en) * 1965-08-06 1970-10-21
US3384027A (en) * 1966-08-03 1968-05-21 Gen Signal Corp Hydraulic starting system and valves therefor
DE1807172A1 (en) * 1968-11-06 1970-06-11 Bosch Gmbh Robert Device for the electro-hydraulic remote control of hydraulic directional control valves

Also Published As

Publication number Publication date
DE2236888A1 (en) 1973-02-08
DE2236888C3 (en) 1978-04-13
JPS4835402A (en) 1973-05-24
US3847061A (en) 1974-11-12
DE2236888B2 (en) 1977-08-18
FR2147740A5 (en) 1973-03-09
CA971822A (en) 1975-07-29
IT963300B (en) 1974-01-10
SE383556B (en) 1976-03-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee