RU2288106C1 - All-road-tire wheel - Google Patents

Abstract

FIELD: transport engineering; road vehicles.

SUBSTANCE: invention relates to road vehicles designed for operation on hard-surface roads and off-roads. Proposed wheel has two interrupted treads with curvilinear bridges in longitudinal direction arranged in staggered order in antiphase of one tread relative to the other. Wheel is made in form of one monowheel with middle continuous tread larger radius of rolling as compared with said interrupted left-hand and right-hand treads. When running along even rigid non-deformable surface , tire pressure is to be increased and in this case only middle tread will be in constant contact with support surface, thus excluding dynamic loads on wheel and vehicle. When operating on surfaces of low carrying capacity, pressure inside tire is to be reduced, and in this case all three treads will be in contact with support surface.

EFFECT: increased traction-and-adhesion properties and cross-country capacity of vehicle driving wheels at decrease of their mass.

4 dwg

Description

The invention relates to land mobile vehicles for working on paved roads and in off-road conditions.

A device for paired pneumatic wheels is known, in which straight lintels are made on the treadmills and each of the wheels of the pair is mounted in antiphase on the drive axle shaft so that together they provide a continuous rolling circumference. When working on wet dirt roads and on surfaces with low bearing capacity due to rectangular jumpers, increased traction and coupling properties of paired half-round wheels are provided.

The disadvantages of such paired half-round wheels are their increased mass and the occurrence of large shock loads on them at the moment of entering the straight edges of the bridges in contact with the supporting surface [1].

A similar wheel-walking device is also known, in which the jumpers on the treadmills of the twin wheels are placed around the perimeter so that the round parts of the twin wheels when in contact with the supporting surface work with overlapping, helping to reduce the impact loads on them when the straight edges of the jumpers come into contact with a supporting surface. Testing of model specimens of such paired half-round wheels on class 1, 4 tractors showed that it is not possible to completely free from shock loads, especially on paved roads [2]. It was found out that during the transition from the work of the circular part of one wheel to the joint work of two circular parts of the wheels in the overlap zone, a kinematic discrepancy arises between them due to the difference in the dynamic radii of rolling wheels in pairs, which leads to increased resistance, rolling and wear, as well as additional dynamic load on the transmission and engine of the mobile machine.

The aim of the invention is to increase the traction and coupling properties and cross-country ability of driving wheels of mobile machines, to reduce the own masses of wheels and impact loads upon entering the jumper contact with the supporting surface.

The device described in [2] is taken as a prototype.

Similar features of the proposed drive wheel with increased cross-country ability compared to the prototype is the presence of intermittent treadmills.

The invention differs from the prototype in that instead of two half-round wheels paired on the same drive axle, a monowheel with three racetracks is proposed, of which the middle racetrack is continuous and the two extreme are intermittent (Figure 2).

The average treadmill has a greater rolling radius compared to the extreme. When driving on a flat, rigid, non-deforming surface, the pressure inside the tire is increased, and then only the middle treadmill will be in continuous contact with the supporting surface, as a result of which dynamic loads on the wheel and the machine are completely eliminated.

When working on surfaces with low bearing capacity, the pressure inside the tire is reduced and in this case all three treadmills will be in contact with the supporting surface.

The second distinguishing feature is the presence of curved edges of the jumpers, oriented in the longitudinal direction on the extreme treadmills in comparison with the rectilinear transverse jumpers of the prototype. The curved edges of the jumpers, oriented in the longitudinal direction, can increase the time of their sequential contact with the supporting surface and thereby reduce the impact on the supporting surface.

The third distinguishing feature is the uniform specific pressure in the contact spot compared to the prototype, in which the specific pressure is two times higher when in contact with the supporting surface of the circular part of one wheel compared to the position when two circular parts of the paired wheels are in contact with the supporting surface.

Thus, the proposed drive wheel has a novelty, significant distinguishing features and a positive effect, which consists in reducing its weight, increasing traction and coupling properties and maneuverability, reducing dynamic loads on the engine and transmission of a mobile car, improving its smoothness.

Figure 1 and figure 2 shows a General view of the device of the wheel off-road, which consists of a disk 1, the average continuous treadmill 2, the left treadmill 3, the right treadmill 4, the jumpers of the left treadmill 5, the jumpers of the right treadmill 6, the diameter of the average treadmill D ₁ , the diameter of the right and left tracks D ₂ , the diameter of the disc D ₃ . Figure 3 presents a scan of the surfaces of the treadmills of the wheel off-road.

The device operates as follows. When working on roads and on hard undeformable surfaces, the internal pressure inside the tire is increased to a value at which, under the action of normal vertical load per wheel, its drawdown h _w does not exceed the difference between the radii of the average treadmill and the lateral 0.5D ₁ -0.5D ₂ ≤h _W. In this case, the jumper edges of the treadmills will not come into contact with the supporting surface, which means that shock loads on the wheel will not occur.

When working on surfaces with low bearing capacity, the pressure inside the tire of the wheel is reduced (Figure 4). Under the influence of the vertical weight load and the driving moment, the tire will have a large drawdown h _w . Due to the low bearing capacity, soil subsidence h _gr will also occur. The increased contact area of the tire with the soil reduces its compaction, and a spherical shape with curved edges of the jumpers increases the traction and coupling properties of the wheel and its profile throughput in the process of overcoming single, threshold obstacles.

Information sources

1. A.S. No. 590164 (USSR). Drive wheel of a vehicle / E.P. Bochkov. - Publ. in BI - 1978. - No. 4.

2. Protocol for research tests of the semi-circular driving wheels of the MT3-82 tractor. / Federal State Institution "Kirovsky Zonal Machine Testing Station". - p.g.t. Orichi, 2005.

Claims (1)

An off-road wheel, including two intermittent treadmills with curved jumper shapes in the longitudinal direction, staggered in antiphase from one track to another, characterized in that it is made in the form of one monowheel with an average continuous treadmill, which has a larger rolling radius compared to with the mentioned intermittent left and right tracks.

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