GB891042A - Hydraulic controls for change speed gears - Google Patents

Hydraulic controls for change speed gears

Info

Publication number
GB891042A
GB891042A GB24592/59A GB2459259A GB891042A GB 891042 A GB891042 A GB 891042A GB 24592/59 A GB24592/59 A GB 24592/59A GB 2459259 A GB2459259 A GB 2459259A GB 891042 A GB891042 A GB 891042A
Authority
GB
United Kingdom
Prior art keywords
valve
line
pressure
brake
brakes
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
GB24592/59A
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 GB891042A publication Critical patent/GB891042A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control 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
    • F16H61/02Control 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
    • F16H61/0262Control 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H2716/00Control devices for speed-change mechanisms of planetary gearings, with toothed wheels remaining engaged, e.g. also for devices to simplify the control or for synchronising devices combined with control devices
    • F16H2716/04Control devices for speed-change mechanisms of planetary gearings, with toothed wheels remaining engaged, e.g. also for devices to simplify the control or for synchronising devices combined with control devices the control being hydraulic or pneumatic
    • F16H2716/06Circuits thereof

Landscapes

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

Abstract

891,042. Change-speed control. CATERPILLAR TRACTOR CO. July 17, 1959 [March 18, 1959], No. 24592/59. Class 80 (2). [Also in Group XXXIV] In a vehicle transmission having speed ratio trains and forward and reverse trains selectable by hydraulically applied brakes, a selector valve 18 controls the supply of fluid from an enginedriven pump 14 to brake cylinders 1, 2, 3 for first, second and third gears, and a valve 20 controls the supply to brake cylinders F, R for forward and reverse, and the arrangement is such that the forward and reverse brakes can only be applied after the application of one of the gear ratio brakes. A valve 28 controls the rate at which the pressure rises in a selected brake cylinder. The transmission, which is described in Specification 891,041, is of the planetary type and a main clutch is dispensed with. Valves 18, 20 are manually operated and, as shown are in their neutral positions. The pump supplies liquid through a line 30, the pressure in which is determined by the valve 28 which is loaded by a spring 44 compressed by a piston 43 subject to pressure derived from the line 30 through a restricted orifice 32 and passages 38 in a valve 26, and through a restricted orifice 41 in a floating check valve spool 39. Valve 18 is moved successively to the right to open the speed ratio brakes to pressure, and a valve 22 is interconnected with the valve 18 and prevents flow of liquid from a line 33 to the valve 20 when the valve 18 is in its neutral position; and thus the forward and reverse brakes can only be applied after the selection of a gear ratio brake. If valves 18, 20 are actuated simultaneously the restricted orifice 32 maintains a pressure differential sufficient to ensure that the gear ratio brake is applied first. The rate of application of the brakes is controlled, since when valve 18 is operated to open a brake line to the line 30 the pressure in line 30 drops while the brake line is being filled and the valves 28, 26 move to the left. Piston 43 is moved to the right by the spring 44 and the expelled liquid moves the check valve 39 to the left, uncovering an exhaust line 40 to give rapid exhaust. When the brake line is filled valve 28 is opened by liquid entering a cavity in its spool through orifices 34, and the loading on the valve is gradually increased to increase the pressure in the brake cylinders, by pressure liquid admitted to the piston 43 through the restrictions 38, 41.
GB24592/59A 1959-04-28 1959-07-17 Hydraulic controls for change speed gears Expired GB891042A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US891042XA 1959-04-28 1959-04-28

Publications (1)

Publication Number Publication Date
GB891042A true GB891042A (en) 1962-03-07

Family

ID=22215708

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24592/59A Expired GB891042A (en) 1959-04-28 1959-07-17 Hydraulic controls for change speed gears

Country Status (1)

Country Link
GB (1) GB891042A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065391A1 (en) * 1981-05-08 1982-11-24 Deere & Company Hydraulic vehicle transmission control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065391A1 (en) * 1981-05-08 1982-11-24 Deere & Company Hydraulic vehicle transmission control system

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