FR2426816A2 - Electrohydraulic controller for hydrostatic transmission - has devices biassing valve spool toward positions porting fluid to standard controller and from manual controller respectively - Google Patents

Electrohydraulic controller for hydrostatic transmission - has devices biassing valve spool toward positions porting fluid to standard controller and from manual controller respectively

Info

Publication number
FR2426816A2
FR2426816A2 FR7832786A FR7832786A FR2426816A2 FR 2426816 A2 FR2426816 A2 FR 2426816A2 FR 7832786 A FR7832786 A FR 7832786A FR 7832786 A FR7832786 A FR 7832786A FR 2426816 A2 FR2426816 A2 FR 2426816A2
Authority
FR
France
Prior art keywords
controller
fluid
standard
hydrostatic transmission
pressure
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.)
Granted
Application number
FR7832786A
Other languages
French (fr)
Other versions
FR2426816B2 (en
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.)
Eaton Corp
Original Assignee
Eaton Corp
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
Priority claimed from US05/909,138 external-priority patent/US4158290A/en
Application filed by Eaton Corp filed Critical Eaton Corp
Publication of FR2426816A2 publication Critical patent/FR2426816A2/en
Application granted granted Critical
Publication of FR2426816B2 publication Critical patent/FR2426816B2/fr
Granted 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
    • F16H61/46—Automatic regulation in accordance with output requirements
    • 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
    • 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
    • F16H61/462—Automatic regulation in accordance with output requirements for achieving a target speed ratio

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

The electro-hydraulic control is for a hydrostatic transmission including a variable displacement hydraulic pump, a fixed displacement hydraulic motor, and fluid operable strokers to vary the displacement of the pump. The electro-hydraulic control is in series between the charge pump and the standard manual controller and determines the pressure of the charge fluid ported to be standard controller. The electro-hydraulic control includes a spool biased toward a first position to port fluid from the charge pump to the standard controller, and biased toward a second position to relieve to tank the pressure of fluid ported to the manual controller. The baising toward the second direction is accomplished, in part, by pressure in a fluid chamber exerting a biasing force on the spool, the fluid chamber being in communication with drain through a variable orifice which is variable in response to a pressure command signal.
FR7832786A 1978-05-24 1978-11-21 Electrohydraulic controller for hydrostatic transmission - has devices biassing valve spool toward positions porting fluid to standard controller and from manual controller respectively Granted FR2426816A2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/909,138 US4158290A (en) 1977-05-11 1978-05-24 Electro-hydraulic controller

Publications (2)

Publication Number Publication Date
FR2426816A2 true FR2426816A2 (en) 1979-12-21
FR2426816B2 FR2426816B2 (en) 1983-09-02

Family

ID=25426684

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7832786A Granted FR2426816A2 (en) 1978-05-24 1978-11-21 Electrohydraulic controller for hydrostatic transmission - has devices biassing valve spool toward positions porting fluid to standard controller and from manual controller respectively

Country Status (2)

Country Link
DE (1) DE2900224A1 (en)
FR (1) FR2426816A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537801A1 (en) * 1982-12-10 1984-06-15 Commercial Shearing CONSTANT SPEED GENERATOR DRIVE SYSTEM AND SPEED CONTROL APPARATUS OF A TREE
FR2537386A1 (en) * 1982-12-13 1984-06-15 Sundstrand Corp Hydraulic transmission seizure prevention system
EP3587810A1 (en) * 2018-06-29 2020-01-01 Robert Bosch GmbH Hydrostatic axial piston pump for a hydrostatic drive

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3042837C2 (en) * 1980-11-13 1982-12-09 Hydromatik Gmbh, 7900 Ulm Control and regulating device in a hydrostatic transmission

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB990054A (en) * 1960-07-08 1965-04-22 Citroen Sa Andre Regulator device for hydraulic motors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB990054A (en) * 1960-07-08 1965-04-22 Citroen Sa Andre Regulator device for hydraulic motors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537801A1 (en) * 1982-12-10 1984-06-15 Commercial Shearing CONSTANT SPEED GENERATOR DRIVE SYSTEM AND SPEED CONTROL APPARATUS OF A TREE
FR2537386A1 (en) * 1982-12-13 1984-06-15 Sundstrand Corp Hydraulic transmission seizure prevention system
EP3587810A1 (en) * 2018-06-29 2020-01-01 Robert Bosch GmbH Hydrostatic axial piston pump for a hydrostatic drive

Also Published As

Publication number Publication date
DE2900224A1 (en) 1979-11-29
FR2426816B2 (en) 1983-09-02

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