GB1139184A - Torque-sensitive infinitely variable change speed gear - Google Patents

Torque-sensitive infinitely variable change speed gear

Info

Publication number
GB1139184A
GB1139184A GB1902466A GB1902466A GB1139184A GB 1139184 A GB1139184 A GB 1139184A GB 1902466 A GB1902466 A GB 1902466A GB 1902466 A GB1902466 A GB 1902466A GB 1139184 A GB1139184 A GB 1139184A
Authority
GB
United Kingdom
Prior art keywords
transmission
torque
speed
driving
downshift
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
GB1902466A
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.)
Piaggio and C SpA
Original Assignee
Piaggio and C SpA
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 Piaggio and C SpA filed Critical Piaggio and C SpA
Publication of GB1139184A publication Critical patent/GB1139184A/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
    • F16H61/66—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 specially adapted for continuously variable gearings
    • F16H61/662—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 specially adapted for continuously variable gearings with endless flexible members
    • F16H61/66227—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 specially adapted for continuously variable gearings with endless flexible members controlling shifting exclusively as a function of speed and torque

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Transmission Devices (AREA)

Abstract

1,139,184. Variable-speed gear. PIAGGIO & C. S.p.A. 29 April, 1966 [15 May, 1965], No. 19024/66. Heading F2D. The speed ratio of an I.C. engine transmission comprising driving and driven expandable sheaves connected by a V-belt, is steplessly varied by (a) speed sensitive means, comprising centrifugal masses, which upshifts the transmission as the speed of the driving sheave increases, and (b) torque sensitive means effective to counteract (a) to downshift the transmission when the transferred torque is increased above a predetermined value. In Fig. 1, driving half-sheave 6 is axially movable to increase, or decrease, the diameter wrapped by V-belt 11, (a) by means of centrifugal masses 9 as the speed of the driving shaft 1 increases, and (b) by means of sleeve 2, which has a helical path 4 in which a pin 3 on the driving shaft runs, and which sleeve, above a value of torque which corresponds to the pre-loading at assembly of spring 8, abuts stops 10 on guides 5 to downshift the transmission. Preloading of the spring 8 may be obtained through a lost motion stroke of the sleeve 2. In Figure 2, (not shown), centrifugal masses 25 move helical ramps 20 on which rollers 20<SP>1</SP>, of a pitman 21 connected to the movable halfsheave 17<SP>1</SP>, run to upshift the transmission. A box 16, connected to axially-fixed halfsheave 17 and carrying toothed sections 14 which mesh with a pinion 13 on the driving shaft 12, is rotated by a transferred torque giving rise to an angular displacement of sectors 14, counteracted by pre-loaded springs 18, which sectors act on the masses 25 to return them to the centre to downshift the transmission.
GB1902466A 1965-05-15 1966-04-29 Torque-sensitive infinitely variable change speed gear Expired GB1139184A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1096565 1965-05-15

Publications (1)

Publication Number Publication Date
GB1139184A true GB1139184A (en) 1969-01-08

Family

ID=11134691

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1902466A Expired GB1139184A (en) 1965-05-15 1966-04-29 Torque-sensitive infinitely variable change speed gear

Country Status (4)

Country Link
DE (1) DE1550899B1 (en)
ES (1) ES326750A1 (en)
FR (1) FR1493490A (en)
GB (1) GB1139184A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143601A (en) * 1983-07-18 1985-02-13 Piaggio & C Spa Variable-transmission-ratio mechanical drive with v-belt and expansible sheaves

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216678A (en) * 1978-04-17 1980-08-12 Borg-Warner Corporation Drive system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001901B (en) * 1955-03-22 1957-01-31 Suedd Ilo Werk G M B H Speed-dependent regulating, continuously variable V-belt transmission, especially for motor vehicles
DE1056486B (en) * 1956-02-18 1959-04-30 Vladimir Hruska Infinitely variable traction gear for vehicles
DE1086507B (en) * 1957-08-15 1960-08-04 Leipzig Inst Foerdertech Automatic regulation of the transmission ratio between the drive motor and the means of transport, e.g. B. wheels, caterpillars driving fluid gears
FR1205727A (en) * 1958-08-09 1960-02-04 Motobecane Ateliers Improvements to automatic variable speed drives with extendable pulley and V-belt, especially for mopeds and small vehicles
FR1222197A (en) * 1959-04-22 1960-06-08 Cie Int Machines Agricoles Automatic hydrostatic torque converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143601A (en) * 1983-07-18 1985-02-13 Piaggio & C Spa Variable-transmission-ratio mechanical drive with v-belt and expansible sheaves

Also Published As

Publication number Publication date
FR1493490A (en) 1967-09-01
ES326750A1 (en) 1967-03-16
DE1550899B1 (en) 1971-06-16

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