GB2189441A

GB2189441A - Wheel and tyre assembly

Info

Publication number: GB2189441A
Application number: GB08709582A
Authority: GB
Inventors: Wolfgang Weise; Roland Kanis; Manfred Doring; Manfred Amthor
Original assignee: RONNEBURG FAHRZEUGZUBEHOER
Current assignee: RONNEBURG FAHRZEUGZUBEHOER
Priority date: 1986-04-24
Filing date: 1987-04-23
Publication date: 1987-10-28
Also published as: GB2189441B; DD248549A1; FR2600945B1; FR2600945A1; DE3709602A1; GB8709582D0

Description

1 GB 2 189 441 A 1 SPECIFICATION bead and the diameter of which is

greaterthan that of the seat and each rim portion being provided with Wheel and tyre assembly passage means interconnecting the recess and the pressure chamber.

The present invention relates to a wheel and tyre 70 The internal air pressure of the air space enclosed assembly, especiallyfor a land vehicle, in particular a bythe pneumatictyre is thus present directly atthe motor vehicle, an automotive agricultural and tyre beads.

working machine or a trailer. Preferably, each rim portion, in the region of a Known types of vehicle wheel assemblies include boundary of the recess, has a protrusion against pneumatic tyres having carcasses which freely 75 which the associated tyre bead bears in bridge overthe wheel rim (DE-OS 25 09 941), which pressure-tight manner.

can have seating surfaces, opening radially inwards, An embodiment of the present invention will now forthe tyre beads and larger diameter mounting be more particularly described byway of example grooves or high mounting beds adjoining these with referencetothe accompanying drawing,the seating surfaces (DE-PS 30 00 428) and/oran upright 80 singlefigure of which is a schematic cross-section of encircling emergency-running supportshell (DE-OS part of a vehiclewheel and tyre assembly 34 05 363). In the radially enlarged mounting grooves embodying the invention.

of these wheel rim typesjoreign mattersuch as Referring nowto the drawing, there is shown part water, dirt and the like can ingress and not come out of a vehiclewheel andtyre assembly 1 comprising a automatically, so thatthe function of thewheel 85 pneumatictyre 2 and a wheel, which can be assembly is adversely affected. These defects have undivided or divided, for example according to been countered by provision of a variety of different DE-OS 34 08 402, DE- OS 34 20 402 (Figure 9) or DWP forms of sealing elements (DE-OS 32 37 544,33 36 9028 (Figure 2) and which comprises a central disc 239,33 36 278,3408 953) which generally havethe portion 20 and rim 3with, atthetwo sides of the penalty of introducing new disadvantages. These 90 wheel, rim portions defining seating surfaces 16 and new disadvantages are mainly increased costs, 17 opened radially inwards and adjoined by high assembly and service, reduced operational reliability mounting beds or grooves 12 and 13. The seating and increase in weight. A substantially simplified surfaces extend inclined or parallel tothe wheel axis.

solution of the problem is represented bythewheel The grooves 12 and 13 are in that case tapered bythe rim shape according to DE-OS 34 05 363, which 95 wheel rim portions 3 atthe radially inward diameters makes possible a closure of the mounting grooves 9 and 10 in such a mannerthatthey are closed off by means of thetyre bead itself, whereby the outwardly bythetyre beads 4 and 5. Cores 18 and 19 above-mentioned defects of additional sealing are presentwithin the beads and can also extend into elements are eliminated and the sealing itself is the region of the inner diameters 9 and 10.

improved. The basis of the closure according to 100 Advantageously, the rim portions 3 in the region of DE-OS 3405 363 is a bearing, which closes off and the diameters 9 and 10 are each provided with a seals the mounting grooves, of the tyre bead atthe hump 8, against which the associated one of thetyre wheel rim. This closure and sealing element is, beads 4 and 5 bear in pressure-tight manner.

however, dependent on position and shape, The tyre beads 4 and 5 thus act in a region in which assembly, inherent tension, surface, material and 105 conventional loadings are taken up and in another aging. Strength and long term behaviour of the seal region in which merely a sealing function takes maytherefore be unsatisfactory. It is also not place. A range of constructional possibilities, in excluded thatthe mounting grooves of the wheel terms of material and technique, exists forthe rims may open due to external influences under individual regions of the beads 4 and 5.

extreme conditions of use, for example during 110 Openings 14 and 15, which connectthe airspace fording with military vehicles. 11 of the pneumatic tyre 2 with the grooves 12 and A f u rther defect of al 1 the afore-mentioned seals is 13, are present in the rim portions 3 i n the region of that it is not possi ble to check for ingress of foreig n the outer groove diameters 6 and 7.

matter into the mounting grooves without removal The tyre beads 4 and 5 are forced, by air under of the tyre. 115 pressure from the space 11, outwardly againstthe There is thus a need for a wheel assembly with a rim portions 3 and the grooves 12 and 13 arethus sealing arrangement which, compared with the closed off in pressure-tight manner and protected described prior art, may be stronger, more secure, against ingress of foreign matter.

free of fatigue and maintenance and thereby stable Thus, it is not possible even under application of for a long time. This should preferably be carried out 120 extreme external forces to load the grooves 12 and in such a way, without use of additional sealing 13 with foreign matter, since thatwould necessitate a elements, as to make an ingress of foreign matter pressure loss analogously to the opening of a impossible even under extreme loadings. pneumatic tyre. Any such pressure loss would, According to the present invention there is however, provide a useful indication of extreme provided a wheel and tyre assembly comprising a 125 external loading and possible impairment of the wheel and a pneumatic tyre mounted on two rim functional capability of the assembly.

portions each at a respective side of the wheel and

Claims

bounding a pressure chamber, each rim portion CLAIMS defining a seat

engaged by a respective bead of the tyre and an adjoining recess which is closed bythe 130 1. A wheel and tyre assembly comprising a 2 GB 2 189 441 A 2 wheel and a pneumatictyre mounted ontwo rim portions each at a respective side of the wheel and bounding a pressure chamber, each rim portion defining a seat engaged by a respective bead of the tyre and an adjoining recess which is closed bythe bead and the diameter of which is greaterthan that of the seat and each rim portion being provided with passage means interconnecting the recess and the pressure chamber.
2. An assembly as claimed in claim 1, wherein each of the rim portions further defines a protrusion disposed ata boundary of the recess and pressurably engaged by the associated bead.
3. Awheei and tyre assembly substantially as herein before described with reference to the accompanying drawing.

Printed for Her Majesty's Stationery Office by Croydon Printing Company (UK) Ltd, 9187, D8991685. Published byThe Patent Office, 25 Southampton Buildings, London,WC2A lAY, from which copies maybe obtained.

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