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WO2008104730A1 - Dispositif à affaissement limité amélioré - Google Patents

Dispositif à affaissement limité amélioré Download PDF

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Publication number
WO2008104730A1
WO2008104730A1 PCT/GB2007/000678 GB2007000678W WO2008104730A1 WO 2008104730 A1 WO2008104730 A1 WO 2008104730A1 GB 2007000678 W GB2007000678 W GB 2007000678W WO 2008104730 A1 WO2008104730 A1 WO 2008104730A1
Authority
WO
WIPO (PCT)
Prior art keywords
wheel
run
segments
flat device
sleeve
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.)
Ceased
Application number
PCT/GB2007/000678
Other languages
English (en)
Inventor
Trevor John Chandler
John Bemard Savage
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.)
Runflat International Ltd
Original Assignee
Runflat International 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 Runflat International Ltd filed Critical Runflat International Ltd
Priority to PCT/GB2007/000678 priority Critical patent/WO2008104730A1/fr
Publication of WO2008104730A1 publication Critical patent/WO2008104730A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/04—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency
    • B60C17/06—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency resilient
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/02—Seating or securing beads on rims
    • B60C15/028—Spacers between beads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/04—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency
    • B60C17/041—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency characterised by coupling or locking means between rim and support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/04—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency
    • B60C17/041—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency characterised by coupling or locking means between rim and support
    • B60C17/042—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency characterised by coupling or locking means between rim and support preventing sliding or rotation between support and rim

Definitions

  • This invention relates to vehicle wheels provided with inflatable tyres and in particular the invention is concerned with devices fitted on the internal rim of a wheel inside the tyre enabling the wheel to run with a deflated tyre. Such devices have become known as "run-flat devices”.
  • the present invention is concerned with improved clamping means and parts for more securely, reliably and accurately, clamping together segments of a segmented ring run- flat device.
  • any differential gearbox in the transmission drive path to a wheel with a deflated tyre will divert torque away from the driven wheels that have inflated tyres to the wheel with the deflated tyre. This in turn causes rotation of the deflated tyre relative to the metal wheel, particularly where the metal wheel is a driven wheel.
  • Run-flat devices that fit on the rim of the metal wheel inside the tyre are well known, and usually comprise an annular body on to which that part of the outer circumferential wall of the tyre that is in contact with the ground or road can contact.
  • the annular body is usually made in two parts that are clamped to the outer rim of the metal wheel and the annular body is designed to slip circumferentially on the metal rim when the tyre deflates. This slippage is important because it allows the tyre to slip on the wheel rim whilst ensuring little or no slippage of the tyre relative to the outer circumference of the annular body.
  • the annular body comprises two semi-circular segments that are pivotally connected together at each end by a single clamping bolt that clamps the two segments together.
  • Radial clamping of the segments onto the metal wheel is achieved by a cylindrical band extending around the circumference of the segments that can be tightened to pull the segments together prior to tightening the pivot bolts.
  • the pivotal connection at one end of the segments has an elongate slot through which the clamping bolt passes that allows circumferential movement of the segments relative to each other during clamping them on to the rim of the metal wheel.
  • the bolt is accessible for tightening from only one side of the segments.
  • a single circumferential clamping means is used at one end of the segments.
  • the clamping means comprises a slot in one of the segments, and the slot has an inclined surface.
  • a tapered wedge is provided in the slot and engages the inclined surface.
  • a single bolt (accessible from one side) passes through holes in each end of adjoining segments. At least one of the holes is elongated to allow relative circumferential movement of the segments.
  • a problem with both of these known types of segmented run-flat devices is that because a single bolt is used at at least one end of the segments, each segment can pivot relative to the other and move out of alignment radially relative to the other segment. This can cause damage to the inside surface of the outer circumferential wall of the tyre when the tyre becomes deflated. This is particularly more of a problem with the prior known run-flat devices that do not use circumferential clamping bands because the two segments tend to open up like jaws under centrifugal and centripetal loads.
  • the leading edge of one segment can protrude beyond the circumference of an adjoining segment of the protruding segment and release the frictional engagement of the annular body on the rim of the metal wheel, allowing ' relative rotational slippage of the run-flat device on the rim of the metal wheel. Consequently, excessive wear on the run-flat device and the rim of the metal wheel is caused and the wheel becomes unbalanced during normal running.
  • the protruding edges of the displaced segments exacerbate the damage to the inside of the tyre and can cause the annular body to twist out of alignment with the plane of rotation of the wheel. This may lead to the tyre coming off the metal wheel altogether.
  • each segment has a single captive bolt that is only accessible from one side of the segments, and the segments are of an asymmetric shape, with the design of one end of each segment being different from the other end of the same segment.
  • An object of the present invention is to provide a run-flat device comprising a plurality of segments inter-connected by clamping means that even more reliably and securely limits or prevents relative pivotal movement between the segments; and which prevents movement of the coupled segments relative to the wheel or to a sleeve if present, until required by the 15 event of a tyre deflation.
  • Figure 1 shows a cross-sectional view through a wheel fitted with a run-flat device incorporating the present invention
  • Figure 2 is a side elevation showing a segmented ring and inner sleeve of the run-flat device of Figure 1 ;
  • Figure 3 is a schematic perspective view of the run-flat device of Figure 1;
  • Figure 4 shows a cross sectional view through the ends of two adjacent segments of the run flat device of Figure 2 and shows in greater detail the clamping means of the present invention
  • Figure 5 shows a schematic cross-sectional view of an inner sleeve of the run-flat device of Figure 2;
  • Figure 6 shows a run flat device of Figures 1 to 5 fitted to a two part wheel.
  • the wheel assembly 10 comprises a metal wheel 11 adapted to be fixed to a wheel hub of a vehicle (not shown) by way of conventional studs and nuts (not shown), or threaded studs (not shown).
  • An inflatable tyre 12 is mounted on the rim of the metal wheel in a conventional manner.
  • the metal wheel is of a single piece construction of the type in widespread use, and is provided with a conventional inflation valve (not shown).
  • the metal wheel could be made of a well-known two-part construction that has a removable rim as shown in Figure 6.
  • a run-flat device 13 comprising an annular body 14 made of three modified nylon segments 15 that are either clamped directly to the outer diameter of the wheel rims, or, as is preferred, clamped to the outer circumference of an inner modified nylon sleeve 16 split to permit the inner sleeve 16 to be opened and snapped in place around the outer diameter of the wheel 11.
  • the said segments are preferably constructed from a modified nylon material that has elastomeric properties and enhanced ballistic and shock absorption.
  • the inner sleeve 16 is also preferably made of a modified nylon, but modified in the sense of having enhanced lubricity and bearing functions.
  • central band 17 In other less preferred constructions it could be constructed with a nylon central band 17 and polyurethane edge bands 18 as shown in Figure 5.
  • the central band has a dove-tail shaped recess 17(a) on each side face and polyurethane side bands 18 if used would each have a dove-tail shaped side member 18(a) that fits into one of the recesses 17(a).
  • the central band 17 provides rigidity to resist side-loads of the side walls as they collapse inwards whilst integrally formed side bands of the same modified nylon material 18 provide rigidity with flexibility or resilience to cushion the contact between the beads of the side-walls of the tyre 12 to avoid damage to the tyre 12 when the tyre deflates.
  • the outer circumference of the central band 17 has a recess 41 and the inner circumference of the segments 15 have a flange 42 that locates in the recess 41.
  • a high temperature grease lubricant is preferably liberally applied to the outer circumference of the inner sleeve 16 and the inner circumference of the segments 15 which form a rotatable roller assembly.
  • the outer circumference of the sleeve 16 may be provided with peripheral grooves.
  • a shear pin 43 may be provided (as shown in Figure 5) for each segment 15 to accommodate this radial movement whilst restraining the segments 15 circumferentially until the pins 43 are sheared by the deflated tyre contacting the segments 15 and causing the segments 15 as a complete ring to rotate.
  • the shear pin 43 is inserted through a hole in the central part of the rim of the wheel and through the inner sleeve 16.
  • the inner circumference of the inner sleeve 16 may be profiled to match the profile of a specific metal wheel, or could simply bridge across the recesses or wells of the metal wheel 11 between the surfaces 12(a), 12(b) on which the beads of the side walls of the tyre 12 sit.
  • the inner sleeve 16 must be shaped so as not to impede the fitting of the tyre because it is necessary to provide gaps or circumferential recesses that allow each side wall of the tyre 12 to fit as the tyre is slipped over the front rim of the metal wheel 11 prior to inflation,
  • the inner sleeve 16 functions as a tyre bead retainer that stops the sidewalls of the tyre 12 collapsing inwards when the tyre is deflated.
  • FIG. 6 there is shown a second type of metal wheel 11 fitted with a run- flat device 13 of the present invention.
  • the metal wheel 11 is in two parts 44 and 45.
  • the main part 44 of the wheel constitutes the rear rim 46 and central rim 47 of the wheel 11 on to which the rear wall of the tyre 12 is fitted and the second part 45 constitutes the front rim 48 that retains the front side wall of the tyre 12.
  • the second part 45 is bolted to the main part 44 of the wheel prior to inflation of the tyre 12.
  • the run-flat device 13 is of a similar construction to that described and shown in Figures 2 to 5.
  • the inner sleeve 16 shown in Figure 1 effectively blocks off the deep wells formed in the rim of the metal wheel and serves to stop the side wails of the tyre falling into the deep wells when the tyre deflates.
  • the inner sleeve 16 may be dispensed with but in this case a bead retaining, device may be needed or the inner periphery of the segments modified to form a bead retaining device.
  • the three segments 15 are symmetrical about a radial plane orthogonal to the axis of rotation of the wheel and are of identical shape whether for a left-hand wheel or a right-hand wheel.
  • Each segment is a segment of a hollow cylinder with a concave end 20 and a convex end 21.
  • the convex ends 21 are of a complementary shape to the concave ends 20 so that the convex end 20 of each segment 15 nestles into the concave end 21 of an adjacent segment 15.
  • the segments 15 are assembled inside the tyre 12 with the convex ends 21 constituting the leading edge relative to the direction of rotation of the tyre 12 when it is running wholly deflated.
  • Each segment 15 has an arcuate recess 22 on each side to lighten the segments.
  • a clamping means 23 constructed in accordance with the present invention in the form of two parallel bolts 23(a), 23(b) each associated with a pair of anti-vibration washers (not shown).
  • the most preferred type of anti- vibration washers are those where opposed mating surfaces are provided with upstanding inter-engagable formations such as serrated edges which mutually interact to prevent slippage of those washers.
  • the shape of the ends of adjacent segments 15 and details of the clamping means is best seen in Figure 3.
  • the concave end 20 of each segment has a flange 26 of half the thickness of each segment and two circumferentially spaced holes 24, 25 are drilled through the flange 26.
  • the holes 24 are of a slightly larger diameter than that of the bolts 23(a) and 23(b) to allow relative movement of the end 20 relative to end 21.
  • the convex end 21 of each segment has a flange 27 that overlaps the flange 26 in a circumferential direction.
  • the flange 27 is provided with an elongate slot 28 that has inclined surfaces 29 that face away from the concave end 20 of the adjacent segment 15.
  • a wedge 31 having an inclined face 32 that abuts the inclined face 29 of the slot 28 in the convex end 21 of the segment 15 is placed in the slot 28 with the inclined face of the wedge 31 in contact with the inclined faces 29,
  • the angle of the wedge surface is preferably such as to permit optimum subsequent clamping force of the roller assembly on the wheel directly in the case of one piece wheels, or upon the sleeve in the case of two or three part wheels.
  • the wedge 31 has a hole 31 (a) through which one of the dome-headed clamping bolts 23(a) is passed. Prior to usage, the bolt and preferably all six such bolts, have a thread adhesive applied to the thread in the region where the corresponding nut will be applied thereto.
  • thread lock adhesive as sold under the 'LOCTITE 1 brand.
  • the ends 21 of the segments have two spaced holes 33, 34 that align with the holes 24, 25 in ends 20.
  • Two captive nuts 35 are mounted on a retaining plate 36 and the nuts 35 are inserted into the holes 33, 34 in the flanges 27.
  • a second dome headed clamping bolt 23(b) is passed through a hole 37 in a clamping plate 38, through the slot 28 and holes 34 and screwed into the second captive nut 35.
  • the clamping plate 38 bridges the slot 28 and is shaped so as not to interfere with bolt 23(a).
  • bolt 23(b) is tightened the clamping plate 38 engages a sidewall of the segment (15) and pulls the two flanges 26, 27 axially together in a direction parallel to the axis of rotation of the wheel 11.
  • the rear side wall of the tyre 12 is levered on to the front rim of the metal wheel 11 and then the inner sleeve 16 is prised open and fitted over the rim of the metal wheel inside the deflated tyre 12.
  • the slit 39 in the inner sleeve 16 is positioned to align with the inflation valve of the wheel (not shown).
  • the rear wall of the tyre is then pushed over the sleeve 16 on to the rear rim.
  • the segments 15 are inserted into the cavity of the deflated tyre from the front and are loosely assembled around the inner sleeve 16 with the heads of the bolts 23(a), 23(b) facing outwards.
  • the wedges 31 are then tightened down by tightening the bolts 23(a) evenly to an appropriate torque setting as will permit rotation of the roller assembly in the run-flat mode, whilst preventing unwanted rotation of the roller assembly directly on the internal wheel rim or on the sleeve where fitted.
  • This tightening to desired torque causes the wedges 31 to pull the segments 15 together and thereby clamp the segments 15 firmly to the inner sleeve 16 (where fitted) and clamp the inner sleeve 16 (where fitted) to the internal rim of the metal wheel 11.
  • the bolts 23(b) are fully tightened to an appropriate torque value effective to clamp the flanges 26 and 27 together axially.
  • the outer sidewall of the tyre 12 is then levered over the front rim of the metal wheel 11 and the tyre 12 inflated.
  • the tyre 12 collapses onto the outer circumferential surface of the run-flat device 13 in the region where the tyre 12 contacts the ground or road. This causes the run-flat device 13 to slip circumferentially on the rim of the metal wheel 11. This slippage between either the segments 15 and the rim of metal wheel (where no inner sleeve 16 is fitted) or between the segments 15 and the inner-sleeve 16 (where a sleeve 16 is fitted), ensures that there is little or no relative rotation between the tyre 12 and the run-flat device 13 and consequently little or no damage to the tyre 12. The beads of the sidewalls of the tyre 12 are prevented from collapsing inwards by the inner sleeve 16 that acts as a bead retainer when the tyre deflates.
  • the run-flat device 13 is subject to centripetal and centrifugal forces, which, in the absence of the second bolt 23(b) would loosen the circumferential grip of the run-flat device 13 on the metal wheel 11 by allowing the segments 15 to pivot relative to each other.
  • the bolts 23(a), 23(b) also provide both clamping in the circumferential direction and clamping in the axial direction (in a direction along the axis of rotation of the wheel) and prevent the segments twisting out of alignment with the wheel 11 when the deflated tyre contacts the outer circumference of the run-flat device 13,
  • a non-electronic security mark can be incorporated into appropriate non-bearing surfaces of the component parts, especially the segments.
  • a unique geometric profile can be incorporated into one or more segments that can act as a unique identity profile associated with the manufacturer and may further be associated with manufacturing and/or other production or test data ascribed uniquely to each relevant assembly.
  • the roller assembly consisting of the interconnected segments
  • the sleeve can be prevented from rotating relative to the wheel by using a transverse block sited within a gap in the periphery of the sleeve.
  • a solid block of steel, alloy, nylon or other deformation resistant material can be bolted, welded or otherwise affixed to the internal rim of such wheel to prevent rotation of the sleeve in inflated and deflated modes.
  • Such a block is desirable to enhance the 'run-flat' performance of the assembly especially in 'run-flat', i.e. tyre deflated mode.
  • the transverse block (not shown) can be e.g. various shapes, such as rectangular or machined to accommodate opposing ends defining a peripheral gap at a circumferential location.
  • a principal advantage of the present invention is that unlike other run-flat systems which necessitate the tyre fitter placing his hands inside the interior of the tyre during the fitting procedure, an assembly method is possible wherein the fitter can avoid placing either or both hands inside the tyre. For example, it is possible to use a cord, strap or rope to bring the ends of the assembly together and to install the fixing bolts without insertion of hands into the interior of the type. This can help to reduce or avoid accidental injury during the installation procedure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

L'invention concerne un dispositif à affaissement limité (13) destiné à être adapté sur la périphérie externe d'une roue (11) dans un pneu gonflable, ledit dispositif (13) comprenant une bague annulaire (14) réalisée à partir de plusieurs segments arqués (15) ayant une bride à chaque extrémité qui chevauche périphériquement les brides correspondantes (26, 27) par un moyen de serrage (23) espacé régulièrement autour de la bague (14) qui confère à chaque segment (15) une force de serrage périphérique et une force de serrage axiale pour pousser les segments (15) en périphérie et dans l'axe les uns vers les autres, le moyen de serrage comprenant un premier et un second boulon de serrage (23a, 23b) qui passent à travers une paire de trous espacés formés dans les brides adjacentes, le dispositif étant caractérisé par le fait que les boulons de serrage sont utilisés en association avec des rondelles de blocage anti-vibrations.
PCT/GB2007/000678 2007-02-27 2007-02-27 Dispositif à affaissement limité amélioré Ceased WO2008104730A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/GB2007/000678 WO2008104730A1 (fr) 2007-02-27 2007-02-27 Dispositif à affaissement limité amélioré

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB2007/000678 WO2008104730A1 (fr) 2007-02-27 2007-02-27 Dispositif à affaissement limité amélioré

Publications (1)

Publication Number Publication Date
WO2008104730A1 true WO2008104730A1 (fr) 2008-09-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/000678 Ceased WO2008104730A1 (fr) 2007-02-27 2007-02-27 Dispositif à affaissement limité amélioré

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Country Link
WO (1) WO2008104730A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011163513A1 (fr) * 2010-06-23 2011-12-29 Dynamic Runflats, Inc. Insert de roulage à plat en plusieurs parties
DE102015015943A1 (de) * 2015-12-08 2017-06-08 Bundesrepublik Deutschland, vertreten durch das Bundesministerium der Verteidigung, vertreten durch das Bundesamt für Ausrüstung, Informationstechnik und Nutzung der Bundeswehr Notlaufsystem mit Klebeendverdichter
GB2575889A (en) * 2018-07-26 2020-01-29 Carbon Threesixty Ltd A supporting member

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1560299A (fr) * 1966-11-15 1969-03-21
WO2003106199A1 (fr) * 2002-06-17 2003-12-24 Runflat International Limited Dispositif de limitation d'affaissement en deux parties pourvu de goupilles de cisaillement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1560299A (fr) * 1966-11-15 1969-03-21
WO2003106199A1 (fr) * 2002-06-17 2003-12-24 Runflat International Limited Dispositif de limitation d'affaissement en deux parties pourvu de goupilles de cisaillement

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011163513A1 (fr) * 2010-06-23 2011-12-29 Dynamic Runflats, Inc. Insert de roulage à plat en plusieurs parties
US8800623B2 (en) 2010-06-23 2014-08-12 William W. Gardetto Multi-piece run-flat insert
DE102015015943A1 (de) * 2015-12-08 2017-06-08 Bundesrepublik Deutschland, vertreten durch das Bundesministerium der Verteidigung, vertreten durch das Bundesamt für Ausrüstung, Informationstechnik und Nutzung der Bundeswehr Notlaufsystem mit Klebeendverdichter
DE102015015943B4 (de) 2015-12-08 2019-05-09 Bundesrepublik Deutschland, vertreten durch das Bundesministerium der Verteidigung, vertreten durch das Bundesamt für Ausrüstung, Informationstechnik und Nutzung der Bundeswehr Notlaufring für ein aus Felge und Gasbereifung bestehendes Rad
GB2575889A (en) * 2018-07-26 2020-01-29 Carbon Threesixty Ltd A supporting member
GB2575889B (en) * 2018-07-26 2020-07-29 Carbon Threesixty Ltd A supporting member

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