[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

GB2013841A - Work fluid system - Google Patents

Work fluid system

Info

Publication number
GB2013841A
GB2013841A GB7834037A GB7834037A GB2013841A GB 2013841 A GB2013841 A GB 2013841A GB 7834037 A GB7834037 A GB 7834037A GB 7834037 A GB7834037 A GB 7834037A GB 2013841 A GB2013841 A GB 2013841A
Authority
GB
United Kingdom
Prior art keywords
fluid pressure
control
fluid system
fluid
work
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.)
Withdrawn
Application number
GB7834037A
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Publication of GB2013841A publication Critical patent/GB2013841A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
    • F16H61/4139—Replenishing or scavenging pumps, e.g. auxiliary charge pumps
    • 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
    • F16H61/433—Pump capacity control by fluid pressure control means
    • 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
    • F16H61/46—Automatic regulation in accordance with output requirements
    • 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
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status
    • F16H2059/6838—Sensing gearing status of hydrostatic transmissions
    • F16H2059/6861—Sensing gearing status of hydrostatic transmissions the pressures, e.g. high, low or differential pressures

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Fluid Pressure (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Power losses are reduced during operation of a work fluid system, such as an hydrostatic transmission (14), provided with a control fluid system for controlling the operation of the work fluid system. A modulatable relief valve (79) establishes a control fluid pressure and is automatically adjustable to reduce the control fluid pressure during periods when the working fluid pressure in the work fluid system is itself at less than the maximum level due to load variations on the work fluid system or other causes. This reduces the volume of fluid which is discharged through the valve over a period of time but does not interfere with operation of the systems since the control fluid pressure demand is a function of the working fluid pressure. By reducing discharge through the control system fluid relief valve at times when a high control fluid pressure is not needed, a significant power saving is effected. <IMAGE>
GB7834037A 1978-01-30 1978-08-21 Work fluid system Withdrawn GB2013841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87334978A 1978-01-30 1978-01-30

Publications (1)

Publication Number Publication Date
GB2013841A true GB2013841A (en) 1979-08-15

Family

ID=25361462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7834037A Withdrawn GB2013841A (en) 1978-01-30 1978-08-21 Work fluid system

Country Status (1)

Country Link
GB (1) GB2013841A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257270A (en) * 1991-06-27 1993-01-06 Barmag Barmer Maschf Hydraulic switching system
WO2008121203A1 (en) * 2007-03-30 2008-10-09 Caterpillar Inc. Hydrostatic drive system with variable charge pump
FR2956462A1 (en) * 2010-02-18 2011-08-19 Poclain Hydraulics Ind HYDRAULIC TRANSMISSION DEVICE IN WHICH THE MAIN PUMP CAN BE ACTUATED PERMANENTLY.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257270A (en) * 1991-06-27 1993-01-06 Barmag Barmer Maschf Hydraulic switching system
GB2257270B (en) * 1991-06-27 1995-08-30 Barmag Barmer Maschf Hydraulic switching system
WO2008121203A1 (en) * 2007-03-30 2008-10-09 Caterpillar Inc. Hydrostatic drive system with variable charge pump
FR2956462A1 (en) * 2010-02-18 2011-08-19 Poclain Hydraulics Ind HYDRAULIC TRANSMISSION DEVICE IN WHICH THE MAIN PUMP CAN BE ACTUATED PERMANENTLY.
EP2361798A1 (en) * 2010-02-18 2011-08-31 Poclain Hydraulics Industrie Hydraulic transmission system in which the main pump can be permanently activated
US8857172B2 (en) 2010-02-18 2014-10-14 Poclain Hydraulics Industrie Hydraulic transmission system having a main pump that can be actuated continuously

Similar Documents

Publication Publication Date Title
JPS55109788A (en) Feed pump control system
ES478482A1 (en) Standby supply system for delivering pressure fluid to a user component
GB2013841A (en) Work fluid system
AU558958B2 (en) A load sensing hydraulic system
JPS5311306A (en) Pump unit
GB2014257A (en) Transmissions Having Controls and a Fluid Supply
JPS5632088A (en) Input torque controlling system for variable displacement pump
JPS5673203A (en) Pressure controlling system for parallel load in concentrated hydraulic system
JPS56129785A (en) Capacity controlling device of variable hydraulic pump
JPS57210188A (en) Total horsepower control method for a multitude of oil hydraulic pumps
JPS53145104A (en) Variable capacity type hydraulic device
JPS57107403A (en) Hydraulic control unit
JPS54108002A (en) Input power controlling system for hydraulic pump
JPS5519904A (en) Discharge flow control equipment of variable capacity pump
JPS53122036A (en) Control process of hydraulic machine equipped with inlet valve
JPS5388460A (en) Oil hydraulic stepliess transmission
JPS575579A (en) Delivery pressure controller for pump
JPS549371A (en) Directional and flow control valve with pressure compensation
JPS5311302A (en) Control circuit of plural hydraulic pump and input controller for control circuit
JPS56129786A (en) Capacity controlling device of variable hydraulic pump
FR2450368A1 (en) Pressure servo control for machine tools - has electrically controlled pressure limiter providing steady pressure set between extreme supply levels
JPS5587876A (en) Capacity controller of variable hydraulic pump
JPS57140576A (en) Liquid pressure pump of variable capacity
JPS56120803A (en) Pressure fluid circuit
JPS5762982A (en) Oil hydraulic unit

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)