DE2130260C3 - Tire-rim arrangement with a radial tire with a low aspect ratio and a bead secured against lateral displacement on the rim - Google Patents

Description

The invention relates to a tire-rim arrangement consisting of a tubeless tire with a belt insert in the area of the tread and a lot more Cross-section showing a height-to-width ratio less than 0.75, and a rim in which at least the outer tire bead in relation to the vehicle is secured against displacement, with no support member being provided in the arrangement.

Such a radial tire is for example from the magazine "Gummibereifung" No. 4/1968, p. 24/25, known, this tire on a so-called. Hump rim is attached to at least the in relation to secure the outer tire bead to the vehicle against displacement. In this known tire-rim arrangement no special measures are taken to ensure that the arrangement even in the deflated or at least partially deflated state and when lateral forces occur could be operated. The main purpose of the hump rim is to loosen the Tire bead from its seat in normal operation, d. H. with at least essentially correct air

i »Prevent pressure when large lateral forces occur. In the deflated state, however, a hump cannot absolutely rule out the possibility of the tire bead becoming detached loosens from its seat and enters the drop center, causing the tire to jump off the rim

ι ϊ with all the resulting negative consequences will.

From the magazine "Die Gummibereifung" No. 3/1963, p. 38, there are experiments with tubeless tires known, at which the air pressure in the tire field

-'Ii gene arrangement was reduced and checked, how the vehicle equipped in this way behaves. Any suggestions for the formation of a tire / rim arrangement, which can still be used safely in a practically vented state and

2) is particularly suitable for lateral forces without loosening the Resisting tire from the rim is not included in this article.

From CH-PS 32229 a pneumatic tire with a Luttschlauch is known, with for sealing

a self-sealing compound is present in an injury is which contains glycerin and powdered sulfur bloom. If the air hose is injured, so the pressurized self-sealing compound seeps through the resulting opening, which is

λ mixed solid body particles adhere and fill them up, so that the crack area is automatically sealed. Special measures in connection with the arrangement of such a tire on a rim to enable loading

-Ki drove in practically largely deflated condition and in particular measures to prevent the tire from becoming detached from a rim if it occurs side forces are not described in this publication. This also applies to DE-PS 633 848 and

4 ". US-PS 1237978, both of which merely use of lubricants in combination with sealants.

From GB-PS 835334 it is known to have an inflatable inside a tire-rim assembly

v) to provide a support element which is provided with a lubricated surface for the purpose of reducing friction. This arrangement, like all other known arrangements with rigid or inflatable support members, is disadvantageous because the assembly

«Days of such support members is difficult and automatically practically impossible to carry out and, moreover, the presence of the support members leads to a deterioration in the properties in normal operation.
The object of the invention is to provide a tire-rim-

Wi arrangement of the genus defined at the beginning in such a way that that while ensuring a simple structure both slow and sudden Air loss the running properties are at least largely retained and one to none

b ^r > Destruction of the tire leading to safe continuation of the journey over longer distances even if side forces occur.

This object is achieved according to the invention

through the simultaneous application of the following known measures,

a) both tire beads are secured on their rim seats against shifting in a rim recess, or a flat-bed rim is provided,

b) the width of the tread is at least equal to the rim width,

c) to lubricate the tire inner walls in at least In the partially vented state, the inner wall is at least in the with one another in Apply a solid coating of lubricant to areas that come into contact.

This combination of features makes it possible, surprisingly, to work with a structure and Driving behavior from a normal tire practically indistinguishable without any additional tires Support elements to achieve emergency running properties that allow that with a practically unpressurized Tire-rim arrangement at speeds of up to 70 km / h over distances of 50 to 80 km can be driven without impairing driving safety or the tire-rim arrangement damaged in a way that prevents them from being used after repairs have been carried out will.

Particularly advantageous refinements of the subject matter of the invention are set out in the subclaims specified.

The invention is described below with reference to the drawing, for example. It shows

Fig. 1 is a schematic sectional view of an inflated tire-rim assembly, and

FIG. 2 shows the tire / rim arrangement according to FIG. 1 in the unpressurized and loaded state.

According to FIG. 1, a pneumatic tire 1 is mounted on a flat-bed rim 2. For example, it can be a split Rim or a rim can be used in which a drop center is compressed by axial compression has been closed. The inner surface of the tire is covered with a coating 3 made of rubber provided, in which castor oil is absorbed, with the castor oil to the exposed surface of the layer migrates and forms a lubricant coating on it.

The rubber mixture of the coating has, for example, the following approach:

Weight

Natural rubber

sulfur

Vulcanization accelerator

(Santocure TM)
Stearic acid
castor oil
zinc oxide
GPF carbon black

(ASTM Number N 660 obtained from
Columbian International)

shares
100

2.75

1.0
1.0

25.0
5.0

60.0

194.75

hen, which is impermeable to the lubricating material, so that the lubricating material is prevented while the use of the tire to migrate to the carcass This ensures that decomposition the tire carcass and thus tire damage by the lubricating material is excluded will.

The barrier layer is made up of the following rubber mixture, for example:

Weight shares Natural rubber 100 sulfur 2.75 Stearic acid 1.0 Vulcanization accelerator (Santocure TM) 1.0 mineral oil 5.0 zinc oxide 5.0 GPF carbon black 50.0 (ASTM Number N 660 obtained from Columbian International)

A barrier layer 4 made of a rubber mixture is provided between the cover and the tire carcass

While natural rubber is used in the above blends, blends can also be used containing synthetic rubber polymers.

As indicated in FIG. 1, only areas A and B, C and D shown in dashed lines can optionally have a lubricant layer. These areas correspond to those areas which come into direct contact when the tire is used in an at least largely deflated state. The lubricant coating is always so stable that when the tire / rim arrangement is at a standstill, no accumulations of lubricant can form and thus no uniformity problems arise.

In Fig. 2 the arrangement is shown in the vented and loaded state. Areas A and B and also C and D are in contact. The choice of the running surface width with regard to the rim width, the presence of lubricant in the areas in contact with one another and the fixing of the tire beads on the rim ensure that even in this critical state, no damage occurs, the running properties are essentially retained and the risk of the tire beads becoming detached from the rim is eliminated.

In the embodiment not shown in the drawing, in which an only at least partially ventilated state that becomes effective, normally stored in at least one closed space Lubricant is provided, has a beneficial effect that in the event of a sudden loss of air First of all, the lubricant coating takes effect immediately and damage to the tire-rim arrangement prevents, whereupon the stored lubricant is then also around after its release around the tire and can support the lubricant effect.

1 sheet of drawings

Claims (6)

Patent claims: 1. Tire-rim assembly, consisting of, a tubeless tire with a belt insert in the area of the tread and a cross-section that has a height-to-width ratio smaller than 0.75, and a rim in which at least the outer tire bead in relation to the vehicle is secured against displacement, with no support member being provided in the arrangement, marked through the simultaneous application of the following known measures, a) both tire beads are on their rim seats secured against shifting in a rim recess, or it is a flat bed rim intended, b) the width of the tread is at least equal to the rim width, c) is in the at least partially deflated state for the lubrication of the inner walls of the tire the inner wall at least in the areas that come into contact with one another with a solid coating (3) of lubricants Mistake. 2. tire-rim arrangement according to claim 1, characterized in that the lubricant from one contained in the coating (3) of the tire (1), insoluble in this and for free Surface of the coating consists of migrating liquid. 3. tire-rim arrangement according to claim 1 or 2, characterized in that between a barrier layer (4) for the lubricant is provided for the coating (3) and the carcass. 4. tire-rim arrangement according to one of the preceding claims, characterized in that that the lubricant consists of a gel. 5. tire-rim arrangement according to one of the preceding claims, characterized in that that the thickness of the coating (3) is in the range of 0.025 to 0.65 mm. 6. tire-rim arrangement according to one or more of the preceding claims, characterized characterized in that in the arrangement only an at least partially vented state which becomes effective, which is normally stored in at least one closed space Lubricant is provided.