RU2461468C2 - Safe wheel air tire internal support - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to wheels that allow motion at no excess pressure in tires. Proposed internal support is rigidly secured to knock-down rim by thread joint inside air tire. Support is splitted into teeth that feature elasticity that allows bending by magnitude in contact with road surface equal to difference between support circle arc lengths and those of tire iner part located in contact area.

EFFECT: higher stability at pressure drop.

3 dwg

Description

The invention relates to elements of automobile wheels with pneumatic tires intended for motor vehicles and allowing to ensure relative traffic safety in the event of a sudden loss of excess pressure in the tires of the car and maintaining its mobility in the absence of this pressure.

Known elastic internal support company Hutchinson, installed in the wheel of a vehicle (US patent No. 5246050) with a pneumatic tire 37 × 12,5R16,5 company Goodyear.

Hutchinson’s Safe Composite Run-Flat system, used in this design, is an internal support element consisting of two hemispherical injection molded parts made from a special mixture using elastic ether that can withstand temperatures above 120 ° C . Both parts of the support are connected with tie bolts. This design, installed on a car equipped with tires with CRF support, allows pressure to pass 50 km with a loss of pressure in one or even several tires.

The disadvantage of this support is the low lateral rigidity of its protrusion in the absence of excess pressure, due to its relatively narrow configuration along the width of the support, contributing to lateral vibrations of the vehicle and reducing its directional stability and controllability. This design is used on cars when driving on hard roads and is unacceptable for driving on deformable (soft) soils due to the loss of their mobility.

The closest (prototype) of the known technical solutions is the supporting inner element of the Forverk company (Germany) of the vehicle wheel (French patent No. 2695076) with a pneumatic tire 13.00R20 from Michelin (France). The Forverk support element is a massive rubber ring of a special configuration, reinforced with a steel cord on the base adjacent to the side. Sleeves (hoses) filled with antifriction grease are embedded in the side recesses of the support element around the circumference. In the event of an accident, when the tire "sits" on the support element, the sleeves are destroyed and grease gets between the tire and the ring. Lubrication helps to reduce heat generation from friction of the internal parts of the tire and thereby increases its performance. The Forverk support element for the 13.00R20 tire allows the use of internal tire pressure regulation in off-road conditions and for short-term driving without excessive air pressure in the tires, and also ensures trouble-free operation of the vehicle at high speeds.

The disadvantage of this support is the likelihood of "rolling" the protrusion of the support on the sidewall of the tire with its subsequent break of the cord along the sidewall. This drawback is due to the use of anti-friction lubricant in this design, which contributes not only to reducing friction when the tire’s inner cavity contacts the treadmill and the bearing because of the difference in their radii at the same angular rolling speeds, but also to the bearing moving across the free space in the tire cavity and as a result, “rolling” to the sidewall.

This design does not exclude slippage of the tire and the support on the rim in the absence of air pressure and determines the impossibility of independent movement of the car in such situations. In addition, when driving on deformable soils with broken tires on smooth and radially stiff bearings of this design, a deep track is formed and rolling resistance increases significantly, further aggravated by insufficient adhesion of the support to the ground. As a result, the patency and mobility of the car on these soils is lost. The presence in the design of a non-separable and sufficiently rigid support excludes the possibility of assembling the wheel in the field.

The proposed internal support consists of ends connected by the ends of the bases of two elastic rings with single-ridged protrusions and is placed between the sides of the tire (figure 1). The outer diameter of the support does not limit the radial deformation of the tire with minimal air pressure in it. The total width of the base of the support is greater than the distance between the sides (in the light) by an amount that excludes mutual rotation of the tire, support and rim by the tightened edges of the split rim. In the new design of the inner support, in order to reduce the aforementioned friction (sliding) in the contact in the longitudinal direction and, consequently, the wear of the contacting surfaces of the support and the tire cavity, as well as the temperature of the tire warming up, instead of lubrication, there are teeth formed on the cylindrical part of the support ledges the height of the support (figure 2). In this case, the ratio of the thickness of the teeth "t" to their pitch "z" should be approximately equal to the ratio of the outer diameter of the support "d _o " to the diameter of the inner cavity of the tire "d _w " (t / z≈d _o / d _w ). This design solution eliminates the slip in contact of the support (teeth) with the inner cavity of the tire and is compensated by the bending of the teeth. The number of teeth on the support is determined experimentally (within 40-60 pcs.). The exception of the "run" of the protrusion of the support on the sidewall of the tire, in addition to the lack of lubrication, is compensated by two ridges of the support (Fig. 1), divorced by the external dimension in their upper part, approximately to the width of the treadmill of the tire. Maintaining the car’s passability on deformable soils on the supports (when the tire treadmill is torn off) is ensured by increasing the contact length of the support with the ground by reducing radial stiffness and improving the adhesion of the support divided by the teeth.

The proposed elastic internal support (figure 1, position 2) is installed on a collapsible rim of the wheel (figure 1, position 1) in the cavity of a pneumatic tubeless tire (figure 1, position 3), which limits its radial deformation and provides the necessary its performance with a complete loss of internal pressure due to through damage (punctures, cuts, bullet breakdowns, etc.).

Assembling and disassembling the safe wheel with the replacement of its components in the field provides the ability to:

- significant separate deformation of two single-ridge, dissected by teeth, elastic rings of the support during installation and dismantling of it in the tire;

- tightening and disconnecting the sides of the detachable rim using the tools included in the vehicle spare parts.

The technical result of the claimed internal support of the pneumatic tire is to maintain the mobility of the vehicle after the destruction of the tires, increasing the reliability, directional stability, controllability and maneuverability of the car, as well as the resource of the pneumatic tire.

The specified technical effect on maintaining vehicle mobility is achieved by the following solutions, in contrast to existing designs:

- in order to ensure the required controllability of the vehicle, the support is made with the width of the outer part equal to or reduced by up to 10% of the width of the inner surface of the tire;

- in order to reduce weight, it is made of a V-shaped design, and to simplify the manufacture and assembly, it is made of 2 parts;

- in order to eliminate slippage in the outer part of the support relative to the inner part of the tire in the area of the treadmill and sidewalls at reduced pressure, the support is divided into teeth whose elasticity allows them to bend by an amount equal to the length difference due to their elasticity when passing through the contact zone of the tire with the road parts of the circumference of the support and the inner part of the tire (located in the contact zone);

- in order to ensure inflation of the tire, there are through holes in it connecting the inflation system with the internal cavity of the tire;

- in order to prevent the tire from turning on the rim, it is made wider than the tire at the base along with the tire side parts by an amount that excludes their mutual rotation when the tire rims are clamped in the absence of excess air pressure in the tire;

- in order to provide the necessary rigidity, the base of the support is reinforced, and the reinforcement is provided both in the circumferential and transverse directions;

- to ensure a tight fit of the support and tire on the rim and the necessary bearing capacity of the teeth, the elastic modulus of the base material and the teeth of the support is selected in the range from 30 to 120 kg / cm with an elongation of 100%;

- to ensure the necessary bearing capacity, the height of the teeth of the inner support is selected from 0.3 to 0.7 of the height of the profile of the support, and the thickness of the teeth "t" is selected more than the gap "z" between them, by an amount based on the ratio t / z≈d _o / d _sh .

The specified technical result is also achieved by the fact that the outer lobe of the inner support is less heated due to its light weight, there is also a better possibility of its replacement, including in the field due to greater deformation (compression) of the elastic teeth of the support.

Given some of the test results [1, 2] of the proposed internal support of the safe wheel of the vehicle and the requirements for adjustable pressure tires for BAT [3], it can be argued that the application of the invention will improve the reliability, directional stability, controllability, maneuverability and mobility of the vehicle, and also a tire resource.

Information sources

1. The study of the problems of creating and constructive solutions for combat-resistant tires and high-mileage tires for promising military vehicles. Report on research, FGU 21 NIIII MoD RF, inv. No. 5019, 2008. - 157 p.

2. The development of tires and rims for advanced military vehicles. Report on research, scientific and technological center of NIISHP, inv. No. 13297, 2008. - 203 p.

3. GOST RV 52395 - 2005. Pneumatic tires with adjustable pressure for military vehicles. General technical requirements (inv. No. 4017). - M .: Standartinform, 2006 .-- 5 p.

Claims (1)

The internal support of the pneumatic tire of the safe wheel is rigidly fixed to the collapsible rim by threaded connections in the cavity of the pneumatic tire of the safe wheel of the vehicle, limiting the radial deformation of the tire and providing its necessary performance with a complete loss of internal pressure in the tire, characterized in that the support is divided into teeth, elasticity which allows due to their elasticity when passing through the contact zone of the tire with the road to bend by an amount equal to the difference for in parts of the circumference of the support and the inner part of the tire located in the contact zone.

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