FR2273985A1 - Hydrostatic transmission with automatic pressure control - has safety interlock to provide gradual pressure drop when accelerator released - Google Patents

Hydrostatic transmission with automatic pressure control - has safety interlock to provide gradual pressure drop when accelerator released

Info

Publication number
FR2273985A1
FR2273985A1 FR7517608A FR7517608A FR2273985A1 FR 2273985 A1 FR2273985 A1 FR 2273985A1 FR 7517608 A FR7517608 A FR 7517608A FR 7517608 A FR7517608 A FR 7517608A FR 2273985 A1 FR2273985 A1 FR 2273985A1
Authority
FR
France
Prior art keywords
control
safety interlock
pressure drop
hydrostatic transmission
pressure control
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
FR7517608A
Other languages
French (fr)
Other versions
FR2273985B1 (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.)
Kloeckner Humboldt Deutz AG
Original Assignee
Kloeckner Humboldt Deutz AG
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 Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Publication of FR2273985A1 publication Critical patent/FR2273985A1/en
Application granted granted Critical
Publication of FR2273985B1 publication Critical patent/FR2273985B1/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
    • F16H61/42—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
    • F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
    • 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
    • F16H61/423—Motor 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
    • F16H61/465—Automatic regulation in accordance with output requirements for achieving a target input speed
    • 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
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H59/18—Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Transmission Device (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

The transmission is provided with a hydrostatic pump whose operating pressure is controlled w.r.t. accelerator pedal setting. This provides an optimum transmission control. If the accelerator is released then there is danger that the safety interlock valve is connected in parallel to the pressure control valve which provides a smooth pressure drop in relation to the falling engine speed of the vehicle. This gives the driver a smoother, surer control. The pump is able to maintain a steady output which is regulated to control the pressure to the brakes.
FR7517608A 1974-06-05 1975-06-05 Hydrostatic transmission with automatic pressure control - has safety interlock to provide gradual pressure drop when accelerator released Granted FR2273985A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742427112 DE2427112A1 (en) 1974-06-05 1974-06-05 HYDROSTATIC VEHICLE TRANSMISSION

Publications (2)

Publication Number Publication Date
FR2273985A1 true FR2273985A1 (en) 1976-01-02
FR2273985B1 FR2273985B1 (en) 1977-07-08

Family

ID=5917367

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7517608A Granted FR2273985A1 (en) 1974-06-05 1975-06-05 Hydrostatic transmission with automatic pressure control - has safety interlock to provide gradual pressure drop when accelerator released

Country Status (4)

Country Link
AT (1) AT338630B (en)
CH (1) CH594516A5 (en)
DE (1) DE2427112A1 (en)
FR (1) FR2273985A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2700803C2 (en) * 1977-01-11 1982-10-28 Sauer Getriebe KG, 2350 Neumünster Control system for a drive device
JPS55173750U (en) * 1979-05-31 1980-12-12
DE3244191C2 (en) * 1982-11-30 1985-07-25 Mannesmann Rexroth GmbH, 8770 Lohr Hydraulic cylinder with constant tension control

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1905307A1 (en) * 1969-02-04 1970-08-06 Bosch Gmbh Robert Control device for a hydrostatic transmission
DE2165527C3 (en) * 1971-12-30 1978-12-07 Kloeckner-Humboldt-Deutz Ag, 5000 Koeln Control device for a hydrostatic transmission for motor vehicles

Also Published As

Publication number Publication date
AT338630B (en) 1977-09-12
FR2273985B1 (en) 1977-07-08
CH594516A5 (en) 1978-01-13
ATA422475A (en) 1976-12-15
DE2427112A1 (en) 1976-01-02

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Legal Events

Date Code Title Description
ST Notification of lapse