GB1365036A - Hydraulic ratio changing system for an automatic transmission - Google Patents

Hydraulic ratio changing system for an automatic transmission

Info

Publication number
GB1365036A
GB1365036A GB955873A GB955873A GB1365036A GB 1365036 A GB1365036 A GB 1365036A GB 955873 A GB955873 A GB 955873A GB 955873 A GB955873 A GB 955873A GB 1365036 A GB1365036 A GB 1365036A
Authority
GB
United Kingdom
Prior art keywords
vibrators
pressure
shifts
electromagnet
hydraulic
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
GB955873A
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.)
Voith Getriebe KG
Original Assignee
Voith Getriebe KG
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 Voith Getriebe KG filed Critical Voith Getriebe KG
Publication of GB1365036A publication Critical patent/GB1365036A/en
Expired 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
    • F16H61/04—Smoothing ratio shift
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric 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
    • F16H61/04—Smoothing ratio shift
    • F16H61/08—Timing control

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)
  • Gear-Shifting Mechanisms (AREA)

Abstract

1365036 Change-speed control VOITH GETRIEBE KG 27 Feb 1973 [29 Feb 1972] 9558/73 Heading F2D In an automatic transmission having hydraulically actuated friction elements for selecting different ratios, and control means for reducing the pressure of the hydraulic medium during ratio shifts, timing means is provided for each different ratio shift to determine the periods during which the pressure is reduced. In one embodiment, a hydraulic pump 10 supplies fluid to actuating pistons (not shown) for the friction elements through onoff valves 15 controlled by a device 14 governed by a gear selector lever (not shown) or by output speed and the setting of an engine fuel control 29. The reduction of pressure during ratio shifts is effected by an electromagnet 24 which acts on the spool of a pressure relief valve 20, or on its loading spring 22, and the duration of energization of the electromagnet is determined by a monostable multi-vibrator for each ratio shift, the multi-vibrators 12 and 23 being effective for shifts from first to second and second to third ratios, respectively, and the multi-vibrators 32, 21 being effective during downward shifts. One of these multi-vibrators may be used also for shifts between neutral and first and reverse, or additional multi-vibrators may be provided. The force applied by the electromagnet, and therefore the degree of pressure reduction achieved, is adjusted in accordance with the position of the fuel control 29 by signals fed to the multi-vibrators from a transducer 28 and amplifier 27. In a modification, the adjustment of the valve 25 to reduce pressure is effected by a hydraulic loading under the control of a further valve governed by the multi-vibrators, and the rate of restoration of normal pressure is controlled by a spring- loaded hydraulic accumulator discharging through an orifice.
GB955873A 1972-02-29 1973-02-27 Hydraulic ratio changing system for an automatic transmission Expired GB1365036A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722209447 DE2209447C2 (en) 1972-02-29 1972-02-29 Hydraulic switching device with switching pressure control for a powershift transmission

Publications (1)

Publication Number Publication Date
GB1365036A true GB1365036A (en) 1974-08-29

Family

ID=5837376

Family Applications (1)

Application Number Title Priority Date Filing Date
GB955873A Expired GB1365036A (en) 1972-02-29 1973-02-27 Hydraulic ratio changing system for an automatic transmission

Country Status (5)

Country Link
JP (1) JPS4899561A (en)
DE (1) DE2209447C2 (en)
FR (1) FR2174627A5 (en)
GB (1) GB1365036A (en)
IT (1) IT977916B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518064A (en) * 1981-01-30 1985-05-21 Automotive Products Limited Clutch control means

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1463498A (en) * 1973-05-08 1977-02-02 Automotive Prod Co Ltd Motor vehicle automatic gearboxes
DE2947897A1 (en) * 1979-11-28 1981-07-23 Robert Bosch Gmbh, 7000 Stuttgart HYDRAULIC CONTROL DEVICE FOR POWERTRAIN TRANSMISSION
JPS5712152A (en) * 1980-06-25 1982-01-22 Aisin Warner Ltd Oil pressure regulator for automatic transmission
GB2093134B (en) * 1981-02-12 1985-02-13 Automotive Prod Co Ltd Regulating fluid pressure in the control system of an automatic transmission
JPS6159052A (en) * 1985-06-07 1986-03-26 Yanmar Agricult Equip Co Ltd Speed change control method for running type service machine
JPS6159049A (en) * 1985-06-07 1986-03-26 Yanmar Agricult Equip Co Ltd Speed change control method for running type service machine
DE3607329A1 (en) * 1986-03-06 1987-09-17 Voith Gmbh J M CONTROL DEVICE FOR A MANUAL GEARBOX
DE3835295A1 (en) * 1988-10-17 1990-04-19 Rexroth Mannesmann Gmbh Valve arrangement for the control system of a gearbox

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518064A (en) * 1981-01-30 1985-05-21 Automotive Products Limited Clutch control means

Also Published As

Publication number Publication date
JPS4899561A (en) 1973-12-17
IT977916B (en) 1974-09-20
DE2209447C2 (en) 1974-03-14
FR2174627A5 (en) 1973-10-12
DE2209447B1 (en) 1973-08-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee