GB831486A - Operation of change-speed gearing - Google Patents

Operation of change-speed gearing

Info

Publication number
GB831486A
GB831486A GB2070956A GB2070956A GB831486A GB 831486 A GB831486 A GB 831486A GB 2070956 A GB2070956 A GB 2070956A GB 2070956 A GB2070956 A GB 2070956A GB 831486 A GB831486 A GB 831486A
Authority
GB
United Kingdom
Prior art keywords
drum
gearing
shift lever
ratio
spring
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
GB2070956A
Inventor
Laurence Derek Watts
Maurice George Hibberd Walter
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.)
Scammell Lorries Ltd
Original Assignee
Scammell Lorries Ltd
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 Scammell Lorries Ltd filed Critical Scammell Lorries Ltd
Priority to GB2070956A priority Critical patent/GB831486A/en
Publication of GB831486A publication Critical patent/GB831486A/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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F16H63/42—Ratio indicator devices
    • 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
    • F16H59/02—Selector apparatus
    • F16H59/04—Ratio selector apparatus
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/08—Multiple final output mechanisms being moved by a single common final actuating mechanism
    • F16H63/14—Multiple final output mechanisms being moved by a single common final actuating mechanism the final output mechanisms being successively actuated by repeated movement of the final actuating mechanism
    • 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
    • F16H59/02—Selector apparatus
    • F16H59/04—Ratio selector apparatus
    • F16H2059/047—Ratio selector apparatus with essentially straight linear movement for gear selection, e.g. straight selection movement using detent mechanism for improving feeling

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Control Devices (AREA)

Abstract

831,486. Change-speed control; ratchet gearing. SCAMMELL LORRIES Ltd. April 2, 1958 [Jan. 4, 1957], No. 20709/56. Classes 80 (2) and 80 (3). [Also in Group XXIX] A ratio shift lever 4 controlling planetary gearing in a motor vehicle is oscillated back-andforth about a journal 7 so that one or other of two pawls 16, 17 rotates a drum 5 step-by-step, compressed air fed in through a pipe 33 to a space 34 in the drum then being fed through spring-biased piston-like ports 42 to ports 39 in the housing 1 surrounding the drum and leading through pipes to ratio-establishing brakes in the gearing. The gearing may be a four-speed and reverse planetary gear in series with a twospeed planetary gear. The pawls 16, 17 are pivoted by bolts 22 upon the ratio shift lever 4, and are biased by an inverted U-spring 19 to engage teeth 18 on the drum. A cam 25 on the control housing 1 is so positioned as to disengage the inoperative pawl, e.g. 17, when the other pawl (16) is operative to turn the drum. Detent rollers 26 on levers 27 pivoted upon the casing 1 are biased towards each other by a spring 29 and engage the teeth 18 to hold the drum in a selected position. The piston-like ports 42 in the drum may be made from nylon or carbon. The shift lever 4 is restored to its central position by spring-biased plungers 9 in the housing 1. A catch 45 on the casing normally lies in the path of a lug 46 carried by the drum 5 and limits rotation of the drum 5 to prevent a down-shift into neutral. To engage neutral, a knob 51 on the ratio shift lever 4 is depressed against spring bias so that a plunger 50 engages a lever 47 to withdraw the catch 45 from the path of the drum lug 46. Alternatively, the catch 45 may be modified to prevent the ratio shift lever 4 being moved from the neutral to the reverse position. A governor responsive to engine speed supplies hydraulic or pneumatic pressure to a plunger 58 which, while a predetermined engine speed is exceeded, is projected into the path of the ratio shift lever on its down-shift side to prohibit a down-shift. A switch 57 in the vehicle engine starter circuit is closed only by a cam 56 carried by the drum 5 when neutral has been established in the gearing. A pointer 53 moving over a dial 54 indicating the ratio established in the gearing, Fig. 4 (not shown), is located exteriorly of the control housing.
GB2070956A 1957-01-04 1957-01-04 Operation of change-speed gearing Expired GB831486A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2070956A GB831486A (en) 1957-01-04 1957-01-04 Operation of change-speed gearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2070956A GB831486A (en) 1957-01-04 1957-01-04 Operation of change-speed gearing

Publications (1)

Publication Number Publication Date
GB831486A true GB831486A (en) 1960-03-30

Family

ID=10150370

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2070956A Expired GB831486A (en) 1957-01-04 1957-01-04 Operation of change-speed gearing

Country Status (1)

Country Link
GB (1) GB831486A (en)

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