GB1518614A - Automatic transmission controls - Google Patents

Automatic transmission controls

Info

Publication number
GB1518614A
GB1518614A GB1589176A GB1589176A GB1518614A GB 1518614 A GB1518614 A GB 1518614A GB 1589176 A GB1589176 A GB 1589176A GB 1589176 A GB1589176 A GB 1589176A GB 1518614 A GB1518614 A GB 1518614A
Authority
GB
United Kingdom
Prior art keywords
valve
gear
reverse
linkwork
gears
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
GB1589176A
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.)
Automotive Products PLC
Original Assignee
Automotive Products PLC
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 Automotive Products PLC filed Critical Automotive Products PLC
Priority to GB1589176A priority Critical patent/GB1518614A/en
Publication of GB1518614A publication Critical patent/GB1518614A/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
    • F16H61/065—Smoothing ratio shift by controlling rate of change of fluid pressure using fluid 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
    • F16H61/02—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 characterised by the signals used
    • F16H61/0262—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 characterised by the signals used the signals being hydraulic
    • F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves
    • F16H2061/0288—Relay valve, e.g. valve arranged between shift valve and servo
    • 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
    • F16H61/02—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 characterised by the signals used
    • F16H61/0262—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 characterised by the signals used the signals being hydraulic
    • F16H61/0265—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 characterised by the signals used the signals being hydraulic for gearshift control, e.g. control functions for performing shifting or generation of shift signals
    • F16H61/0267—Layout of hydraulic control circuits, e.g. arrangement of valves

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

1518614 Change speed gear control AUTOMOTIVE PRODUCTS Ltd 12 April 1977 [20 April 1976] 15891/76 Heading F2D An automatic transmission has four forward speeds and reverse, there being a forward clutch 11, a second gear brake band 13, a third gear brake band 14, a top and revearse gear clutch 12 and a reverse gear brake band 15. Manual selection of the lower three gears, reverse, neutral and a park lock is by a selection valve 19. In position D of valve 19 the forward gears are controlled by a valve 42 whose position is responsive to output speed, through linkwork from a speed responsive device 57, and to throttle pedal position acting on a spring- loaded abutment 58 on a rod 54 in the linkwork. To prevent partial movement of valve 42 to a new ratio position causing clutch or brake slippage snap-action valves 39, 41, 84 associated with second, third and fourth gears only open when there is sufficient pressure generated upstream of a restricted flow to drain. When the third and fourth gear valves 41, 84 snap open on upshift they cause the second and third valves 39, 41 respectively to close. Accumulators 38, 90 smooth the engagement of clutches 11, 12 respectively. An accumulator 98 smooths the engagement of third gear from fourth at small throttle openings, the accelerator controlling a valve 97. Kickdown is provided by an actuator 108 acting on rod 54 of the control linkwork when valve 97 is moved sufficiently. Valve 97 also controls a pressure modulator 17 to increase pressure as the throttle is depressed. The emptying and filling of the actuators 131, 141, for brakes 13, 14 happens at substantially the same rate to provide smooth shifts. The pressure from modulator 17 is also increased in reverse.
GB1589176A 1977-04-12 1977-04-12 Automatic transmission controls Expired GB1518614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1589176A GB1518614A (en) 1977-04-12 1977-04-12 Automatic transmission controls

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1589176A GB1518614A (en) 1977-04-12 1977-04-12 Automatic transmission controls

Publications (1)

Publication Number Publication Date
GB1518614A true GB1518614A (en) 1978-07-19

Family

ID=10067402

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1589176A Expired GB1518614A (en) 1977-04-12 1977-04-12 Automatic transmission controls

Country Status (1)

Country Link
GB (1) GB1518614A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2453331A1 (en) * 1979-04-04 1980-10-31 Deere & Co CONTROL DEVICE FOR TRANSMISSION, PARTICULARLY FOR AGRICULTURAL TRACTORS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2453331A1 (en) * 1979-04-04 1980-10-31 Deere & Co CONTROL DEVICE FOR TRANSMISSION, PARTICULARLY FOR AGRICULTURAL TRACTORS

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Legal Events

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