GB1035141A - Improvements relating to civil engineering machines - Google Patents

Improvements relating to civil engineering machines

Info

Publication number
GB1035141A
GB1035141A GB1908264A GB1908264A GB1035141A GB 1035141 A GB1035141 A GB 1035141A GB 1908264 A GB1908264 A GB 1908264A GB 1908264 A GB1908264 A GB 1908264A GB 1035141 A GB1035141 A GB 1035141A
Authority
GB
United Kingdom
Prior art keywords
valve
steering unit
actuator
pressure
supply
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
GB1908264A
Inventor
Frank Melville Robinson
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.)
Priestman Brothers Ltd
Original Assignee
Priestman Brothers 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 Priestman Brothers Ltd filed Critical Priestman Brothers Ltd
Priority to GB1908264A priority Critical patent/GB1035141A/en
Publication of GB1035141A publication Critical patent/GB1035141A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30585—Assemblies of multiple valves having a single valve for multiple output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

1,035,141. Hydrostatic transmissions. PRIESTMAN BROS. Ltd. May 3, 1965 [May 7. 1964], No. 19082/64. Heading F2D. An hydrbstatic transmission, particularly for an excavator vehicle, comprises a main pump 1 supplying two separate fixed displacement motors 6, 7 driving the wheels, and an auxiliary pump 32 supplying a power steering unit 36, the motor circuit containing a change-over valve 20 for selectively connecting the motors in series or parallel with respect to the main pump supply, the change-over being effected by pilot pressure supplied through a branch line 28 from the auxiliary pump supply line 34 under the control of a speed selector valve 35 in the steering unit circuit. The system also includes a manual forward and reverse selector valve 8 and a control valve 61 connected to the steering unit 36 and regulating the supply of pressure liquid to a steering actuator 60 and a rotary actuator 69 for a clam-shell grab which may be of the type described in Specification 1,010,086. As shown the changeover valve 20 connects the motor supply lines 12, 13, 24, 25 in parallel for low-speed drive, but if moved to the left by an actuator 29 connected to line 28 they are connected in series for highspeed drive. In the neutral position shown speed selector valve 35 connects auxiliary pump 32 to steering unit 36 by lines 34, 39, but if moved to the right by an actuator 37, pressure determined by a non-return valve 47 is supplied by lines 42, 28 to the change-over valve 20 to connect the motors 6, 7 in series, the supply at increased pressure to steering unit 36 being maintained. If valve 35 is moved to the left, lines 41, 28 are cut off, but pressure in a second line 42 determined by a second non-return valve 52, set for a higher pressure, is communicated to a brake actuator 54 in addition to the steering unit 36.
GB1908264A 1964-05-07 1964-05-07 Improvements relating to civil engineering machines Expired GB1035141A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1908264A GB1035141A (en) 1964-05-07 1964-05-07 Improvements relating to civil engineering machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1908264A GB1035141A (en) 1964-05-07 1964-05-07 Improvements relating to civil engineering machines

Publications (1)

Publication Number Publication Date
GB1035141A true GB1035141A (en) 1966-07-06

Family

ID=10123482

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1908264A Expired GB1035141A (en) 1964-05-07 1964-05-07 Improvements relating to civil engineering machines

Country Status (1)

Country Link
GB (1) GB1035141A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754341A (en) * 1972-04-13 1973-08-28 Grizzly Corp Chain trencher with shock-resistant silent drive
EP0279362A1 (en) * 1987-02-19 1988-08-24 Deere & Company Hydraulic system
EP1795657A2 (en) * 2005-12-09 2007-06-13 Volvo Construction Equipment Holding Sweden AB Hydraulic circuit for heavy construction equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754341A (en) * 1972-04-13 1973-08-28 Grizzly Corp Chain trencher with shock-resistant silent drive
EP0279362A1 (en) * 1987-02-19 1988-08-24 Deere & Company Hydraulic system
EP1795657A2 (en) * 2005-12-09 2007-06-13 Volvo Construction Equipment Holding Sweden AB Hydraulic circuit for heavy construction equipment
EP1795657A3 (en) * 2005-12-09 2008-12-24 Volvo Construction Equipment Holding Sweden AB Hydraulic circuit for heavy construction equipment

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