DD150873A5 - RADIAL TIRES FOR TRUCKS - Google Patents

Abstract

The invention relates to a radial tire for trucks or similar vehicles, especially for the drive axle of construction vehicles. Due to the favorable design of the tread, an optimal compromise is to be achieved with the given requirements. In accordance with the invention, each transverse block 2, 2 ', 3, 3' is angled in a zigzag manner so that the angles alpha, beta, gamma which form the block legs 5, 5 ', 6, formed by the zigzag bending 6 ', 7, 7' occupy with the equator, increase from the equator 8 to the shoulder and continue the transverse blocks 2, 2 ', 3, 3' are arranged in a specific form.

Description

-Λ

Radial tires for trucks

Area of application of the invention

The present invention relates to a radial tire for trucks or similar vehicles, in particular for the driving axles of construction vehicles, having two circumferentially arranged rows of transverse blocks separated by a zig-zacloidal circumferential groove, the hats separating the transverse blocks opening into the tread edge.

Characteristic of the known technical solutions

Radial tires for trucks having the above features are known. In constructing a tread pattern for a truck tire, various criteria must be considered, all of which can cooperatively provide information about the quality of the tire. In particular, the traction, the cornering, the general handling, the power transmission, the rolling and abrasion behavior, often the improvement of one property leads to a deterioration of one of the other properties, To the driveability of a radial truck tire according to the above embodiment improve without deteriorating the traction ability, z. B, in a known tire of this type, the depth of the circumferential groove separating the two rows of blocks is chosen to be only on the order of about ten percent of the depth of the transverse grooves separating the transverse blocks. As a result, the mobility of the cross blocks can be reduced and thus the road position can be improved, although accepted

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must be that after a small mileage the circumferential groove disappears due to abrasion, which is accompanied by a significant reduction in the traction and drainage capacity of such a tire,

Furthermore, truck radial tires are known in which the cross blocks are angled zigzag, wherein the block legs formed by the zigzag processing take about the same angle with the equator of the tire. Although such tires have a satisfactory rolling behavior, their traction and cornering behavior is not satisfactory *

This deficiency stems from the fact that in a radial tire, unlike a bias tire, in normal operation there is often a tendency for the ground pressure of the tire to be greater in the shoulder area than in the equatorial area. The interaction forces between the footprint of the tire and the ground are therefore also larger in the shoulder area than in the equatorial area. This has the consequence that with the same angular position of a transverse block edge to the equator in the equatorial region a smaller force transmission can take place than in the shoulder region, this fact has the more negative effect on the cornering behavior of such a radial tire, the more the angle, the cross-block edges with the Take the equator, approach the 90 ° mark. The cornering behavior, which in itself becomes worse at such an angular position, now deteriorates in the equatorial region in relation to the shoulder region due to the lower soil pressure,

On the other hand, it is not possible, all cross-block edges over the entire tread width in one

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To arrange small angle to the equator, since the traction too much, since the traction is favored by when block leg edges are present in the axial direction. But since a tire, the side guide is insufficient, and its traction ability can not exploit, as it slips sideways, the known solution, the angle, which take the block legs of a zig-zag cross block with the equator, to keep the same over the entire tread width , Not the. Practical conditions of a radial tire ·

Completely contrary to this is the relative conditions in a bias tire, because in this usually the ground pressure in the equatorial region is higher than in the shoulder area.

Aim of the invention;

The aim of the invention is to provide a radial tire for trucks, in which the life is very large and has optimal performance characteristics.

Dung Principle of the OF INVENTION

The object of the invention is to develop by favorable design of the tread a radial tire for trucks, which represents an optimal compromise with respect to all the demands placed on him and in which the property image remains consistently well over the entire life.

This is erfinduigsgemäß essentially achieved in that each'Querblock is bent in such a zig-zag-shaped, that the angle (ο ^, β, ΤΟ, the by

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Zig-zag angulation formed block legs with the equator, increase from the equator to the shoulder, wherein the equator facing block legs of opposing transverse blocks are aligned, wherein the circumferential groove has at least about 3/4 of the depth of the cross blocks separating grooves and If necessary, the transverse blocks terminate alternately at different distances from the equator. "This combination of properties results in such a tire having excellent lateral guiding and traction properties on the construction site and therefore particularly suitable for use in the driving axles of construction vehicles the good performance, which can be achieved by the selected property combination, not at the expense of abrasion, but that on the contrary, the abrasion behavior by the more uniform stress on the tread over its entire Br eite is very advantageous «,

This favorable performance of the radial tire according to the invention is due to the fact that now in the equatorial region, where the ground pressure is often lower, the angle of the block legs to the equator is smaller, which advantageously favors the lateral guidance behavior. This compensates for the fact that the cornering behavior in the equatorial area must actually be lower than in the shoulder area due to the lower ground pressure. "Although this design of a tread pattern results in somewhat reduced traction in the equatorial region, this does not play a role the axial direction approaching angular position of the block legs in the direction of

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It must be emphasized in this context that the driving behavior of a tire in off-road use must substantially meet the requirement that the vehicle should also be able to climb or descend steeper or not slipping sideways on a slope slope ride. If there is a sideways slipping, even the best straight-ahead traction properties do not help anymore, since they can no longer affect the vehicle. In this sense, the present invention represents an excellent compromise *

The good lateral guidance and thus also traction behavior in the middle region is further enhanced by the fact that the equator facing block legs of opposing transverse blocks are formed in alignment, because this quasi an edge extension takes place, so that the once occurred anchoring the block leg edge in the underground in the course of rolling eich This is particularly advantageous for steep ramps, as it gives the high cornering force in a relatively wide tread region. The lateral thrust resistance is also favored by the fact that according to this embodiment of the invention in the ground relatively compact negative ribs arise, which allow quasi a support of the cross blocks.

Since in construction site use often must be expected with muddy ground, plays the self-cleaning effect of the profile a large role. This property is also improved by the continuously increasing outward angulation of the block legs to the equator.

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In order to further improve the traction in the shoulder area, the cross blocks can end alternately at different distances from the equator. This for such tires in and of itself known feature leading to the formation of a quasi-toothed tread edge _s thereby providing increased grip is obtained.

It is particularly advantageous if the angles (oC, β , 7 ")> which form the block legs with the equator, are within the following limits: oC ~ 35 to 45 °, β - 55 ° to 65 °, T- 70 ° to 80 °, In this Pail the effects described above can be particularly noticeable.

In order to increase the cross-block edge length in the central region of the tread, which contributes significantly to the lateral guidance, it is expedient if the transverse blocks have elongated grooves of the zig-zag-shaped circumferential groove extending in the same direction. This results in a parallel crowd of block edges, which are inclined according to the equator side block leg and whose length corresponds to about one third of the tread width. This edge group favors the cornering behavior and thus the power transmission capability.

In order to improve the self-cleaning ability of the grooves opening into the tread edge, the shoulder-side transverse blockers may have faceted surfaces whose inclination changes alternately, with all surfaces starting approximately equidistant from the bead. As a result, each second transverse block end protrudes somewhat in relation to the transverse block ends between them, forming an attack surface which "favors the pushing out of possibly occurring protection from the transverse grooves."

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2 2 12 4 3

embodiment

In the following the invention will be explained in more detail with reference to exemplary embodiments with reference to the drawings, in which: FIG

Pig * 1 and 2: Side views of a tire according to the invention

Pig * 3: a schematic cross section.

The radial tire 1 shown in Pig "1 has two adjacently arranged in the circumferential direction • series of transverse blocks 2, 2 ^f, 3, ^3! , The transverse blocks 2, 2% 3, 3 '' are angled in a zig-zag shape, with the angles CC, ^ ₃ , T ^, which connect the block legs 5 '5' »6, 6 ^f , 7 '7' with the Include the equator, increase from the equator to the shoulder, that is

The tread pattern shown in Pig «2 has a circumferential groove 4, whose segments inclined in one direction aufv / iron extensions, which form in the block legs 5, 5 ^f , 6, 6», 7, 7 'blind grooves 9, 9'. The ends of the cross blocks 2, 2 ^f, 3 ^"f 3 ends alternately at different distances to the equator 8, wherein they have facet-like Plächen 10, 11 which begin at about the same distance from the tire bead *

Pig. 3 shows a cross section AA * according to Pig. 1, taken from the v / earth that the Hutengrund in the region of the circumferential groove 4 and in the adjacent region is raised by about 25 % relative to the depth of the adjacent transverse grooves. As a result, a stabilization in this area can be achieved, which contributes to a minimization of the abrasion. The increase of the groove bottom is however

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so low that a deterioration in the drainage properties occurs only when the life of the tire with respect to the tread depth is almost reached.

Under a radial tire according to the present invention, a tire is understood as having a carcass composed of at least one of bead reaching to bead layer of rubberized fabric, the textile, plastic or steel cords parallel to each other and in planes extend _s the opposite meridian planes to not more than 10 % . Incidentally, radial tires according to the invention usually have a reinforcing belt, not shown in the figures, which may consist of several layers of rubberized Cordgewerbes.

Claims (4)

27. 6. 1980 57 527/26 Radial tire for trucks and similar vehicles, especially for the drive axles of construction vehicles, with zv / ei arranged in the circumferential direction rows of transverse blocks, which are separated by a zick ~ zack- »hairy circumferential groove, wherein the cross blocks separating grooves open into the tread edge , characterized in that each transverse block (2, 2 ', 3 »3 ^! ) is angled in a zigzag shape such that the angles (j j β * T) t which form the block legs formed by zigzag bending (FIG. 5, 5 ', 6, 6 ¹ , 7, 7 ^f ) occupy with the equator, increasing from the equator (8) to the shoulder, wherein the equator facing block legs (5 »5 ¹ ) of opposing transverse blocks (2, 2' , 3, 3 ¹ ) are aligned, wherein the circumferential groove (4) at least about 3/4 of the depth of the transverse blocks (2, 2 ^?, 3j 3 ') separating grooves and wherein optionally the transverse blocks (2, 2', 3 »3 ') alternately at different distances from the equator the. 2. Radial tire according to item 1, characterized in that the angles (oc , fi ₉ T) ₉ forming the block legs (5, 5 ^f , 6, 6 ^f , 7 »7 ^f ) with the equator (8), within the following Limits are: ' oC = 35 ° to 45 ° β = 55 ° to 65 ° γ = 70 ° to 80 °. 2 2 12 4 3 _ ₉ _ invention claim 3 * radial tire according to item 1 or 2, characterized in that the transverse blocks (2, 2 ^f , 3 »3 ¹ ) in extension of the same direction inclined segments of the zigzag-shaped circumferential groove (4) blind grooves (9j 9 ') have. 27 · 6. 1980 57 527/26 22 124 4 »Radial tire according to item 1, 2 or 3, characterized in that the shoulder-side transverse block ends have facet-like surfaces (10, 11) whose inclination changes alternately, all surfaces (10, 11) starting approximately equidistant from the bead. For this ... JLSeiten drawings in ilii 1Gf; FUS. "/ 5 * v