WO2009115817A2 - Treuil de roue de secours - Google Patents

Treuil de roue de secours Download PDF

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Publication number
WO2009115817A2
WO2009115817A2 PCT/GB2009/000751 GB2009000751W WO2009115817A2 WO 2009115817 A2 WO2009115817 A2 WO 2009115817A2 GB 2009000751 W GB2009000751 W GB 2009000751W WO 2009115817 A2 WO2009115817 A2 WO 2009115817A2
Authority
WO
WIPO (PCT)
Prior art keywords
drum
wheel
winch
input shaft
cable
Prior art date
Application number
PCT/GB2009/000751
Other languages
English (en)
Other versions
WO2009115817A3 (fr
Inventor
Keith Robert Homan
Alistair Young
Original Assignee
Ap Driveline Technologies Limited
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 Ap Driveline Technologies Limited filed Critical Ap Driveline Technologies Limited
Publication of WO2009115817A2 publication Critical patent/WO2009115817A2/fr
Publication of WO2009115817A3 publication Critical patent/WO2009115817A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D43/00—Spare wheel stowing, holding, or mounting arrangements
    • B62D43/02—Spare wheel stowing, holding, or mounting arrangements external to the vehicle body
    • B62D43/04—Spare wheel stowing, holding, or mounting arrangements external to the vehicle body attached beneath the vehicle body
    • B62D43/045—Spare wheel stowing, holding, or mounting arrangements external to the vehicle body attached beneath the vehicle body the wheel or its cradle being attached to one or more chains or cables for handling

Definitions

  • the present invention relates to a wheel winch for releasably securing a wheel to the underside of a vehicle floor.
  • a vehicle spare wheel is often stowed under the floor of the luggage compartment or other similar location.
  • the wheel may be suspended on a carrier attachment on the end of a cable, which passes through the centre of the wheel.
  • the other end of the cable is wound up into a winch mechanism, for example around a drum.
  • the winch is attached to the floor inside the luggage compartment and operated by means of an operating lever or hand brace.
  • the winch mechanism should be easy to operate manually, with suitable gearing between rotation of the lever or hand brace and the winding of the cable around the drum.
  • a wheel winch for releasably securing a wheel to the underside of a vehicle floor.
  • the winch comprises: a housing; a drum mounted for rotation in the housing; a cable having one end fastened to the drum and another end for engaging a wheel; and a gear arrangement for providing a rotational drive to the drum so as to wind/unwind the cable around the drum.
  • the gear arrangement comprises an eccentrically driven orbital gear member including a plurality of axially extending pegs that extend into corresponding recesses in the housing. The pegs engage walls of the recesses to provide a reaction to applied loads and a frictional resistance to movement therebetween.
  • the axially extending pegs are formed of metal, for example steel, and are insert moulded into the orbital gear member, which is formed of a plastics material, for example a reinforced thermo-plastic, during manufacture.
  • the orbital gear member is carried by an eccentric cam.
  • the eccentric cam may be coupled to an input shaft for providing the rotational drive.
  • the input shaft may include tool engagement means for receiving a tool to apply rotation to the input shaft.
  • the eccentric cam has a locating bore receiving the input shaft and a tolerance ring mounted between the input shaft and the locating bore.
  • the tolerance ring may be configured to slip at a predetermined level of torque so as to provide a predetermined level of tension to the cable and an indication that the predetermined level of tension has been applied.
  • a wheel winch for releasably securing a wheel to the underside of a vehicle floor.
  • the winch comprises: a housing; a drum mounted for rotation in the housing; a cable having one end fastened to the drum and another end for engaging a wheel; and a winding mechanism to wind/unwind the cable around the drum.
  • the winding mechanism comprises a rotatable input shaft providing a rotational drive to the drum through a tolerance ring configured to slip at a predetermined level of torque so as to provide a predetermined level of tension to the cable and an indication that the predetermined level of tension has been applied.
  • the winding mechanism may comprise an eccentric cam coupled to the input shaft, wherein the eccentric cam has a locating bore receiving the input shaft, and wherein the tolerance ring is mounted between the input shaft and the locating bore.
  • the tolerance ring may have an interference fit between the input shaft and the eccentric cam.
  • the tolerance ring may take the form of a thin-walled tube with axial corrugations.
  • the drum is provided with internal gear teeth, which mate with corresponding gear teeth of the orbital gear member.
  • There may be a difference in the number of gear teeth on the orbital gear and the number of internal gear teeth in the drum.
  • the difference in the number of teeth may be less than five, when there are at least twenty internal gear teeth in the drum.
  • the gear arrangement may have an input to output gear ratio of more than 5 : 1.
  • the drum may have an outer surface with a helical groove, which locates the cable as it is wound or unwound from around the drum.
  • the input shaft, tolerance ring and eccentric cam may be formed of metal, preferably steel.
  • One or more component of the wheel winch may be formed of a plastics material, for example formed by moulding of a reinforced thermoplastic material.
  • Figures 1a and 1b are views of a vehicle wheel with a central cable carrier shown in perspective from above and below respectively;
  • Figure 2 is an exploded view of a winch assembly
  • FIG 3 shows the components of the winch of Figure 2 assembled, but with the cover removed;
  • Figure 4 is a view from underneath of the cover of the winch of Figure 2.
  • FIGs 1a and 1b illustrate a vehicle wheel 1.
  • the wheel 1 has a central hub 2 surrounding an opening, where the wheel would be secured to an axle of the vehicle. In many instances, the wheel 1 would be a spare wheel of the vehicle and would carry a tyre, but this is not shown in figures 1a and 1b.
  • the wheel 1 is carried by a carrier 3, which supports the wheel 1 at its hub 2 from underneath, and is fixed to a cable 4, which extends through the wheel hub opening to above the wheel, as shown in Figure 1a.
  • the cable 4 is secured to the carrier 3 underneath the wheel 1 , by means of a compression spring 5 and a securing nut 6.
  • the cable tension causes compression of the spring 5 to apply a clamping load that clamps the wheel to the vehicle.
  • a winch mechanism 10 is assembled from the components shown, which include a winch housing 12, a cable drum 14, a ring gear 16, an eccentric cam 18, a tolerance ring 20 (only visible in Figure 1), an input shaft 22 and a housing cover 24.
  • the winch mechanism 10 includes a cable, such as the cable 4 of Figure 1a, which would be secured at one end to the cable drum 14, and at the other end to a wheel carrier, such as the carrier 3 of Figures 1a and 1b.
  • the end of the cable may be secured to the drum with a fitting that latches into a slot on one end of the outside of the drum, with the cable passing through an opening 25 in the side of the winch housing 12.
  • the outer surface of the drum 14 has a helical groove 26, which locates the cable as it is wound or unwound from around the drum.
  • the groove 26 has sufficient length to prevent bunching or multiple wrapping of the cable, which might otherwise cause jamming of the mechanism.
  • the drum 14 has internal gear teeth 28 on its inner surface, which mate with corresponding gear teeth 29 of the ring gear 16.
  • the eccentric cam 18 carries the ring gear 16, and determines the offset radial position of the ring gear 16, so that it mates correctly with the internal gear teeth 28 on the drum 14.
  • the ring gear 16 has an axial bore 30, which receives the eccentric cam 18.
  • the eccentric cam 18 has a circular, cylindrical outer surface 32, which is a close running fit in the bore 30 of the ring gear 16.
  • the outer surface 32 is eccentric with respect to a circular locating bore 34 in the eccentric cam 16.
  • the locating bore 34 is coupled via the tolerance ring 20 to the input shaft 22. The function of the tolerance ring 20 will be described in more detail below.
  • the input shaft 22, tolerance ring 20 and drum 14 are all mounted concentrically within the housing 12.
  • the ring gear 16 is mounted eccentrically on the eccentric cam 18.
  • the cover 24 removed, if the input shaft 22 is rotated, then the ring gear 16 can rotate freely to any position within the drum 14, without transmitting any torque to the drum 14.
  • the ring gear is provided with a number of upstanding pegs 36 protruding from its end face. These pegs 36 locate in circular recesses 39 on the underside of the cover 24. These circular recesses are not visible in Figure 2, but their locations can be seen form raised portions 37 in the upper surface of the cover 24 above each of the recesses.
  • Figure 4 shows the cover, when viewed from the underside, with recesses 39 clearly visible.
  • the recesses 39 in the cover 24 are of a larger diameter than the pegs 36 on the ring gear 16.
  • the input shaft 22 As the input shaft 22 is rotated it drives the eccentric cam 18 within the ring gear 16, and the pegs 36 orbit around inside the recesses in the cover 24.
  • the drive forces on the pegs 36 react against the sides of the recesses, to transmit torque to the drum via the meshing gear teeth 28, 29.
  • the radius of each recess must be equal to the sum of the radius of the corresponding peg 36 and the radial offset of the eccentric cam 18.
  • the ring gear 16 can therefore orbit round the central axis of the winch 10, at the radius of the throw (offset) of the eccentric cam 18, without any net rotation of the gear teeth 29 relative to the winch housing 12.
  • the tendency for the ring gear 16 to roll around the internal gear teeth 28 in the drum 14 forces the drum 14 to rotate within the housing 12, because the pegs 36, reacting against the sides of the recesses 39, prevent precession of the ring gear 16.
  • the number of gear teeth 29 on the ring gear 16 is only slightly fewer than the number of internal gear teeth 28 in the drum 14.
  • the small difference in the number of teeth (typically only three out of over twenty internal gear teeth 28 on the drum 14) provides the winch 10 with a high numerical gear ratio between rotation of the input shaft 22 and rotation of the drum 14 (typically seven or eight to one), this high gear ratio means that rotation of the input shaft 22 can be performed manually using a small lever or hand brace with relatively little effort to wind up the cable, even with a heavy wheel and tyre on the other end of the cable.
  • the outer end of the input shaft 22 is provided with a protrusion 38 that includes an eyelet opening 40.
  • a bar or hooked end of a lever is inserted through the eyelet 40 so as to engage the protrusion and rotate the input shaft 22.
  • a lever or hand brace could engage on a hexagonal drive shape formed on the outer end of the input shaft 22.
  • the cable is in tension as a result of the wheel weight, as well as pre- tensioning of the wheel against the underside of the vehicle floor. This generates a high side loading onto the drum 14 as well as a reverse drive torque through the gearing. However, transmission of the reverse drive torque through the winch mechanism is resisted by the frictional forces in the winch mechanism as well as the high gear ratio, which provide a self-locking effect that prevents the wheel from dropping without restraint having to be applied to the input shaft. There are preferably no low friction bearings or small diameter spindles to reduce drive friction within the winch mechanism.
  • Friction is generated between the outer diameter of the drum 14 within the housing 12, the outer surface 32 of the eccentric cam 18 against the bore 30 of the ring gear 16 and the input shaft 22 mounted at each end in the housing 12 and cover 24.
  • the pegs 36 also rub on the surfaces of the recesses 39 in the cover 24.
  • the tolerance ring 20 that is used for attaching the eccentric cam 18 to the input shaft 22 takes the form of a thin-walled tube with axial corrugations 42.
  • the tolerance ring 20 has an interference fit between the input shaft 22 and the eccentric cam 18.
  • excess torque is applied to the input shaft 22 (when the wheel is pre-tensioned against the underside of the vehicle floor)
  • the tolerance ring 20 will start to slip either on the input shaft 22 or in the bore 34 of the eccentric cam 18.
  • a predictable amount of pre-tensioning is provided as well as preventing excess cable pre-tensioning.
  • the onset of slipping of the tolerance ring 20 can be felt or heard by the operator rotating the input shaft 22.
  • the cable is extended and the wheel secured to the wheel carrier.
  • the input shaft 22 of the winch 10 is then rotated (e.g. with the aid of a lever or tool) to wind up the wheel.
  • the wheel reaches its stowed position against the underside of the vehicle floor, the user continues to wind the input shaft until the correct amount of pretension is applied to the cable.
  • the tolerance ring 20 slips at that point, and the user can feel/hear the slipping, which provides an indication that the wheel is secured with the correct amount of pre-tension.
  • the input shaft 22, tolerance ring 20 and eccentric cam 18 are metallic components, for example made of steel
  • many of the other components may be formed of metal or plastics materials.
  • many of the components may be reinforced thermo-plastic moulded components.
  • the drive pegs 36 are preferably metallic (e.g. steel), and are preferably integral with the ring gear 16.
  • the drive pegs 36 may be steel pins that are insert moulded into the ring gear 16 during manufacture. This provides the required strength for parts that are subjected to very high loading, especially when the wheel is pre-tensioned against the vehicle floor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Gear Transmission (AREA)
  • Gears, Cams (AREA)

Abstract

L’invention concerne un treuil de roue de secours destiné à fixer une roue de manière amovible sous le plancher d’un véhicule. Le treuil comprend : un logement ; un tambour destiné à tourner dans le logement ; un câble dont une extrémité est fixée sur le tambour et l’autre extrémité est destinée à engrener une roue ; et des engrenages destinés à faire tourner le tambour de façon à enrouler/dérouler le câble autour du tambour. Selon un aspect, les engrenages comprennent un engrenage orbital excentrique qui comprend une pluralité de goujons d’engrenages qui s’étendent axialement dans des renfoncements correspondants dans le logement. Les goujons mettent en prise les parois des renfoncements afin de réagir aux charges exercées et d’assurer une résistance au frottement provoqué par les mouvements. Selon un aspect, un arbre d’entrée rotatif fait tourner le tambour par le biais d’un anneau de tolérance configuré pour patiner à un niveau de couple prédéterminé.
PCT/GB2009/000751 2008-03-20 2009-03-20 Treuil de roue de secours WO2009115817A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0805163A GB0805163D0 (en) 2008-03-20 2008-03-20 Wheel winch
GB0805163.3 2008-03-20

Publications (2)

Publication Number Publication Date
WO2009115817A2 true WO2009115817A2 (fr) 2009-09-24
WO2009115817A3 WO2009115817A3 (fr) 2009-11-26

Family

ID=39386497

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2009/000751 WO2009115817A2 (fr) 2008-03-20 2009-03-20 Treuil de roue de secours

Country Status (2)

Country Link
GB (1) GB0805163D0 (fr)
WO (1) WO2009115817A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900009111A1 (it) * 2019-06-17 2020-12-17 Proma S P A Dispositivo per sollevare ed abbassare una ruota di scorta di un veicolo, avente superfici di impegno.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE916370C (de) * 1951-08-08 1954-08-09 Star Kugelhalter Ges M B H Deu UEberlastungskupplung
EP0444790A2 (fr) * 1990-02-21 1991-09-04 Sumitomo Heavy Industries, Ltd Transmission planétaire réductrice du type cycloidale
EP0507032A2 (fr) * 1991-04-01 1992-10-07 Deuer Manufacturing Inc. Unité de levage de pneumatique compacte
WO2007088231A1 (fr) * 2006-02-03 2007-08-09 Batz, S.Coop. Mécanisme permettant d'élever et d'abaisser une roue de secours

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE916370C (de) * 1951-08-08 1954-08-09 Star Kugelhalter Ges M B H Deu UEberlastungskupplung
EP0444790A2 (fr) * 1990-02-21 1991-09-04 Sumitomo Heavy Industries, Ltd Transmission planétaire réductrice du type cycloidale
EP0507032A2 (fr) * 1991-04-01 1992-10-07 Deuer Manufacturing Inc. Unité de levage de pneumatique compacte
WO2007088231A1 (fr) * 2006-02-03 2007-08-09 Batz, S.Coop. Mécanisme permettant d'élever et d'abaisser une roue de secours

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900009111A1 (it) * 2019-06-17 2020-12-17 Proma S P A Dispositivo per sollevare ed abbassare una ruota di scorta di un veicolo, avente superfici di impegno.
WO2020254963A1 (fr) * 2019-06-17 2020-12-24 Proma S.P.A. Dispositif permettant de lever et d'abaisser une roue de secours d'un véhicule présentant des surfaces de contact
US12077221B2 (en) 2019-06-17 2024-09-03 Proma S.P.A. Device for raising and lowering a spare wheel of a vehicle, having engagement surfaces

Also Published As

Publication number Publication date
WO2009115817A3 (fr) 2009-11-26
GB0805163D0 (en) 2008-04-30

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