JPS58128905A - Tread form for vehicle pneumatic tire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a large number of circumferential blocks or block rows lined up in the circumferential direction and their connections Klfi, which have corrugated or zigzag grooves extending in the circumferential direction, and #$7 rank is at least partially The present invention relates to a tread profile for a vehicle pneumatic tire that is inclined relative to a plane parallel to the tire center plane.

Such a contoured vehicle pneumatic tire is known, for example, from US Pat. No. 2,779,37B. In known embodiments, the slopes in the area of the groove edges are present on both sides of the grooves or, if all grooves have slopes on one side, on the same side. The particular groove cross-sections of the known tread shapes all result from the operating conditions of the tire! It is useful for solving L.

This known narrow cross-section tire is vulcanized only in radially divided vulcanization molds with conventional groove depths. However, this type of vulcanization mold requires a very complex structure, so that its manufacturing cost is approximately six times that of a center-split lug.

The invention is therefore based on the task of developing a J11 surface profile which allows the vulcanization of the nine types of vehicle pneumatic tires in a centrally divided mold.

According to the present invention, this problem is solved by the fact that the opening angle between the parallel plane and the flank in the area facing the groove surface of the flank is larger than the opening angle in the area facing the groove bottom, and
The solution is that the IO heavily sloped area is on the groove flank that comes closest to the next tread edge.

The slope according to the invention of the individual flanks in the region of the radially outwardly located groove edges produces sloped surfaces which can be used to some extent as side slopes during the opening of the centrally divided mold by vulcanization. A relative movement in the axial direction between the tire and the mold half is thus possible without damaging the groove edges of the profile.

Due to the increased opening angle between the plane parallel to the tire center plane and the 117t tank, the invention provides that #IK penetrating foreign bodies in the area of the edges can be stuck there, but rather are immediately shaken out by centrifugal force. Provide >U point.

Another advantage is that due to the strong slope of the groove flanks in the area facing the tread, the groove edges are less exposed to damage from foreign objects or from roadway irregularities.

Finally, the possibility of using a centrally divided mold offers the advantage of low maintenance costs and therefore short operational downtimes.

Advantageous developments of the invention can be seen from the implementation section.

Next, two embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 shows the tread shape of a vehicle pneumatic tire.
, the vehicle pneumatic tire has a number of circumferential ribs (not shown in detail) and three circumferentially oriented #$1.2.3, both axially outer #$1 and #6 symmetrically with respect to the tire center plane. Otherwise, their cross-sectional shapes are identical, so that the individual parts of Is1 and 3 are then given the same reference numerals. This is introduced from Figure 2. #$1 7 rank 4 minerals that are far from the next tread edge have a relatively small inclination angle with respect to a plane parallel to the tire center plane in the normal way, and are almost vertical if & end ing.

The second flank 5 of the groove 1, which lies on the adjacent tread edge, is divided into sections in the radial direction. The slope in the range 6 near the groove bottom 70 is the first 7 rank 4
as small as or the same as. However, the slope in the region 9 facing the tread 8 has an essentially large opening angle with respect to the parallel plane.

In the exemplary embodiment of the present invention, a region 10 which is slightly inclined inwardly follows, which region is separated from the region 6 facing the groove bottom 7 by a step 11 . In this case, the groove flanks can be inclined by approximately 90° in step 11 with respect to a plane parallel to the tire center plane. middle jl
il#lI2 has two flanks 12.13, only one of which is strongly sloped and has a sloped area 14 on the side facing the footfall rkJ8. This is also sufficient, since both halves 1 of the vulcanization mold are divided substantially in the middle.
5.16 because the two hands are formed so that they can abut on the edges of the central $2 flank 15 without requiring any additional slopes.

Strongly sloped nine areas of flanks of grooves 1, 2 and 5 9 and 1
4. The tire after vulcanization is able to accommodate the large axial forces that occur during the relative movement of the tire and the mold half-rest 15.15 without causing damage to the highly stressed groove flanks. It serves as a sliding surface to some extent during mold release.

The effect of the present invention is that the cross section of the groove flank, which is subjected to strong stress during demolding, is curved, and the opening angle between the parallel plane of the tire center plane and the 72 ink increases continuously from the groove bottom 7 to the tread surface 8. There is something that can be obtained even if it is held in such a way.

Zigzag with three treads in Figures 3 and 4 $ 1
Other embodiments of the invention are described comprising 7.18.19.

The central groove 18 additionally has a first flank 20 with an inclined area 21, which corresponds in technical operation to the area 14 of the groove 2 of the previous embodiment. For the reasons already mentioned, no additional slope f+ is necessary on the second flank 22 of the central paddle 18.

In both axially outwardly located flanks 23 the flank 23 has an additional slope area 24 of large slope, which slope connects to the next tread edge.

However, the essential difference from the first embodiment is that the strongly inclined range 2
4 has different widths at different points around the tire [6ru]. In this case, the maximum width and therefore the sliding surface of the shank accommodates a large axial force when the tire is released from the mold, i.e. it is located close to the cusp 250 of the rib entering each zigzag. . In the embodiment of the present application, Chiang Frank 25C) strongly slopes and the width of the nine range 24 is adjacent to make the value zero in the nine curve curve 26,
It decreases linearly in the circumferential direction with respect to jtill of this point 25.

[Brief explanation of drawings]

Figure 1 is a partial plan view of the outer circumferential surface of the pleasure pneumatic tire;
The figure is a radial partial cross-sectional view taken along line 1-1@ in Figure 1.
The figure is a partial plan view of the outer peripheral surface of another tire, and FIG. II4 is a partial radial cross-sectional view taken along the y-y line in FIG. Numbers in the figure: 5.12, 20.25...72 Ink 7...Groove bottom 8...Tread 9.14, 21.24...Area agent facing tread 8 Moto Esaki・a

Claims (1)

[Scope of Claims] (1) A large number of scrap lips or block rows arranged in the circumferential direction, and a wavy X-ray zigzag groove extending in the circumferential direction between them, and -) The dark side (8) K side of the flank (5, 12, 20, 25) in a tread profile for a vehicle pneumatic tire, where the flanks are at least partially inclined relative to the tire center plane with respect to the 1iIK plane. The opening angle between the parallel plane and the flank (5, 12, 20, 25) in the range It (9, 14, 21, 24) K is smaller than the opening angle in the groove ji (7) K. large and highly sloping range (9°1
4.21, 24) is on the flank flank (5, 12, 20, 23) closest to the next tread. (2) The opening angle is constant from the groove bottom (7) to the tread (8) t.
The tread shape according to claim 1, wherein the tread shape has an additional length of 11 m. 5. The tread profile according to claim 1, wherein the il$lborank, 23) has in its radial section a plurality of straight sections with a plurality of, in particular two, different opening angles. (4) A tread profile according to any one of claims 1 to 5fjt, in which the groove flank has at least one step (11). (5) Large tilted range of groove flank (23)! ! (2
4) has different widths at different parts of the tire circumference H,
In this case, the width is selected such that it is greatest at the point where the stress is the greatest when the tire takes off.
Tread shape as described in section.