WO2006134333A1 - Ensemble d'entrainement - Google Patents

Ensemble d'entrainement Download PDF

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Publication number
WO2006134333A1
WO2006134333A1 PCT/GB2006/002126 GB2006002126W WO2006134333A1 WO 2006134333 A1 WO2006134333 A1 WO 2006134333A1 GB 2006002126 W GB2006002126 W GB 2006002126W WO 2006134333 A1 WO2006134333 A1 WO 2006134333A1
Authority
WO
WIPO (PCT)
Prior art keywords
kart
pulley
engine
assembly
drive assembly
Prior art date
Application number
PCT/GB2006/002126
Other languages
English (en)
Inventor
Peter Martin Radford
Original Assignee
Peter Martin Radford
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 Peter Martin Radford filed Critical Peter Martin Radford
Publication of WO2006134333A1 publication Critical patent/WO2006134333A1/fr

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
    • F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
    • F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
    • F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
    • F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
    • F16H9/16—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts
    • F16H9/18—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts only one flange of each pulley being adjustable

Definitions

  • This invention concerns a drive assembly, particularly but not exclusively a drive assembly usable on go-karts, and also a go-kart with such a drive assembly
  • go- ⁇ arts have only a single gear, usually driven by a chain from the engine. In practice this means that the go-kart is often in the "wrong gear” relative to the kart's speed and the engine speed.
  • Some go- karts have been provided with gear boxes. These however have proved relatively expensive, and often not wholly successful. Particular problems encountered with go-karts are the lack of space for mounting a component such as a gear box, and also the requirement for minimising weight.
  • Continuously variable transmissions are used in a wide range of applications, and can provide for a number of advantages. As they provide a continuously variable gear ratio, they can provide for a high engine efficiency, along with smooth and seamless acceleration.
  • One type of CVT comprises two V shaped pulleys with a belt extending therebetween.
  • the width of the respective pulleys can be varied such that the effective diameter of the pulleys varies.
  • One pulley can widen and/or the other narrows, thereby changing the gear ratio between the pulleys.
  • a primary pulley is provided on or adjacent an engine, and the width of the pulley is usually controlled by the engine speed.
  • the width of the driven second pulley is generally dictated by a requirement to maintain belt tension.
  • the second pulley may be spring urged closed against the belt tension.
  • This type of CVT shall hereinafter be referred to as a variable diameter pulley CVT.
  • a drive assembly including a variable diameter pulley CVT with a primary pulley, a secondary pulley, and a continuous line means extending therebetween, the secondary pulley extending substantially coaxially around a final drive.
  • the secondary pulley is preferably connected to the final drive by gearing, and the gearing may be in the form of an epicyclic gear.
  • the invention also provides a drive assembly for a go-kart, the assembly being according to either of the preceding paragraphs, with the rear axle forming the final drive.
  • the invention still further provides a go-kart with a drive assembly according to any of the preceding three paragraphs.
  • the go-kart preferably includes an engine with a centrifugal clutch.
  • a variator may be provided on the engine which varies the width of the primary pulley dependent on the engine speed.
  • Fig. 1 is a diagrammatic plan view of a drive assembly according to the invention.
  • Fig. 2 is a diagrammatic rear perspective view of the drive assembly of Fig. 1 as mounted to a go-kart.
  • the drawings show a variable diameter pulley CVT 10 with a primary pulley 12 and a secondary pulley 14. In use these would be connected by a V shaped belt, and the location of this belt is shown diagrammatically by dotted lines 16 in Fig. 1.
  • the CVT 10 is fitted on a go-kart and the primary pulley 12 is mounted on an engine 18.
  • the engine 18 has a centrifugal clutch (not shown).
  • a variator 20 is provided on the engine 18 which causes the width of the primary pulley 12 to decrease as the engine speed increases, thereby increasing the effective diameter of the primary pulley 12.
  • the pulley 12 is formed from two circular plates 22 which diverge away from each other, outwardly from a central part.
  • the circular plate 22 furthest from the engine 18 is fixed, whilst the plate 22 nearest the engine is axially movable by virtue of the variator towards and away from the engine.
  • the secondary pulley 14 again comprises two circular plates 24 with diverging outer parts.
  • the right hand side plate 24 as shown in Fig. 1 is fixed with the left hand side plate 24 movable towards or away therefrom.
  • the left hand plate 24 is urged by a spring 26 towards the right hand plate 24.
  • the secondary pulley 14 is mounted around a final drive 28 which in this instance is the rear axle 30 of the go-kart.
  • the secondary pulley 14 is connected by an epicyclic gear 32 to the axle 30 to drive same.
  • Fig. 2 shows the mounting of the engine 18 on two supports 34 which extend rearwardly behind the driver's seat of the go-kart.
  • the secondary pulley 14 is mounted behind the engine 18 on the supports 34.
  • the primary pulley 12 is not driven by virtue of the centrifugal clutch.
  • the CVT would be in a configuration similar to that shown in Fig. 1.
  • the clutch will activate causing the primary, pulley 12 to rotate and hence rotate the second pulley 14 by virtue of the belt extending therebetween.

Landscapes

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

Abstract

L'invention concerne un ensemble d'entraînement pour kart, l'ensemble comprenant une poulie à diamètre variable CVT (10) constituée d'une poulie primaire (12) et d'une poulie secondaire (14) reliée par une courroie en V. La poulie secondaire (14) est montée autour de l'essieu arrière (30) du kart et reliée à ce dernier par l'intermédiaire d'un engrenage épicyclique (32).
PCT/GB2006/002126 2005-06-16 2006-06-09 Ensemble d'entrainement WO2006134333A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0512265.0 2005-06-16
GB0512265A GB0512265D0 (en) 2005-06-16 2005-06-16 Drive assembly

Publications (1)

Publication Number Publication Date
WO2006134333A1 true WO2006134333A1 (fr) 2006-12-21

Family

ID=34855644

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2006/002126 WO2006134333A1 (fr) 2005-06-16 2006-06-09 Ensemble d'entrainement

Country Status (2)

Country Link
GB (1) GB0512265D0 (fr)
WO (1) WO2006134333A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035806A1 (fr) * 1980-02-29 1981-09-16 Van Doorne's Transmissie B.V. Bloc de propulsion pour véhicule à traction avant, comprenant une transmission continue à courroie
US4481004A (en) * 1978-02-07 1984-11-06 P.I.V. Antrieb Werner Reimers Kommanditgesellschaft Continuously variable transmission mechanism
US20020079146A1 (en) * 2000-12-21 2002-06-27 Tsang-Ying Chen Motor mount of electric cart
EP1473182A1 (fr) * 2003-04-28 2004-11-03 Bombardier-Rotax GmbH & Co. KG Mécanisme de débrayage pour véhicule

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481004A (en) * 1978-02-07 1984-11-06 P.I.V. Antrieb Werner Reimers Kommanditgesellschaft Continuously variable transmission mechanism
EP0035806A1 (fr) * 1980-02-29 1981-09-16 Van Doorne's Transmissie B.V. Bloc de propulsion pour véhicule à traction avant, comprenant une transmission continue à courroie
US20020079146A1 (en) * 2000-12-21 2002-06-27 Tsang-Ying Chen Motor mount of electric cart
EP1473182A1 (fr) * 2003-04-28 2004-11-03 Bombardier-Rotax GmbH & Co. KG Mécanisme de débrayage pour véhicule

Also Published As

Publication number Publication date
GB0512265D0 (en) 2005-07-27

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