JP4149219B2 - Heavy duty tire - Google Patents

Heavy duty tire Download PDF

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Publication number
JP4149219B2
JP4149219B2 JP2002265113A JP2002265113A JP4149219B2 JP 4149219 B2 JP4149219 B2 JP 4149219B2 JP 2002265113 A JP2002265113 A JP 2002265113A JP 2002265113 A JP2002265113 A JP 2002265113A JP 4149219 B2 JP4149219 B2 JP 4149219B2
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Japan
Prior art keywords
groove
lateral groove
tire
tread
circumferential
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JP2002265113A
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Japanese (ja)
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JP2004098914A (en
Inventor
由美子 大窪
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株式会社ブリヂストン
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Description

[0001]
[Industrial application fields]
The present invention relates to a heavy-duty tire, particularly a heavy-duty radial tire for running on rough roads, and intends to achieve both traction performance and wet performance.
[0002]
[Prior art]
For example, for dump truck tires that are frequently used on bad roads and are also used on paved roads, a circumferential groove extending along the equator of the tire and a transverse groove extending in a direction crossing the tire are combined. A so-called rib lug pattern is often used. That is, the tread pattern is intended to have both the excellent rough road traveling performance in the lag pattern and the excellent high speed traveling performance and wet performance in the rib pattern.
[0003]
For example, Patent Literature 1 describes a rib lug pattern mainly considering traveling on a rough road. That is, as shown in FIG. 1, two circumferential grooves 10a and 10b extending zigzag along the equator O of the tire, and between the circumferential grooves 10a and 10b and the circumferential grooves 10a and 10b and the tread end T Three block rows 12 to 14 are defined by a large number of horizontal grooves 11a to 11c that connect each other.
[0004]
This tread pattern ensures the skid resistance especially on wet road surfaces by extending the circumferential grooves in a zigzag shape, while at the same time, the multiple grooves that connect between the circumferential grooves and between the circumferential grooves and the tread ends T Due to the horizontal grooves, especially on rough roads, it is difficult to clog the mud and the mud is easy to discharge, so-called mud repellency, difficult to clog the stones into the groove, and clogged the groove. Ease of stone discharge, so-called stone biting property is secured.
[0005]
[Patent Document 1]
JP-A-8-72509 [0006]
[Problems to be solved by the invention]
However, since the contact pressure of the tread contact surface is higher in the central region in the width direction than in the other areas, the wet effect caused by the use of tires has been reduced after the middle stage of the wear due to a decrease in the edge effect in the central region. The problem was that the performance, particularly the skid resistance on wet roads, deteriorated.
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to maintain the performance of the tread pattern when it is new even when the tread surface wears. It is to propose a tread pattern.
[0008]
[Means for Solving the Problems]
The gist of the present invention is as follows.
(1) By two circumferential grooves extending zigzag along the equator of the tire on the tread surface of the tire, and a large number of lateral grooves connecting the circumferential grooves and between the circumferential grooves and the tread ends, respectively. It is a heavy duty tire in which three rows of block rows are formed,
The center lateral groove that connects the two circumferential grooves has a bent portion at the center, while the side lateral groove that connects the circumferential groove and the tread end has a groove width that gradually increases from the circumferential groove toward the tread end. Further, the center lateral groove and the side lateral groove extend while inclining with respect to the equator of the tire, and the tire has a direction opposite to the equator and is opposite between the center lateral groove and the side lateral groove .
[0009]
(2) The heavy duty tire according to (1) above, wherein the depth of the circumferential groove is 80 to 100% of the depth of the lateral groove.
[0010]
(3) The heavy duty tire as described in (1) or (2) above, wherein the circumferential groove is arranged in a region of 25 to 65% of a tread half width centering on the equator of the tire.
[0011]
(4) The heavy duty tire as described in any one of (1) to (3) above, wherein the length of the side lateral groove is 50% or more of the half width of the tread.
[0012]
(5) The heavy duty tire according to any one of (1) to (4) above, wherein the width of the center lateral groove is 30 to 50% of the width of the side lateral groove.
[0014]
(6) The tire for heavy loads according to (1) above, wherein an inclination angle of the center lateral groove and the side lateral groove with respect to the equator is 40 to 90 °.
[0015]
(7) The heavy duty tire according to any one of (1) to (6) above, wherein each block in the block row sandwiched between circumferential grooves has a narrow groove with a narrow opening width.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Now, the tread pattern of the present invention will be described in detail with reference to FIG.
That is, the illustrated tread pattern includes two circumferential grooves 1a and 1b extending zigzag along the equator O of the tire, a large number of center lateral grooves 2 connecting the circumferential grooves 1a and 1b, and the circumferential direction. Three block rows 4 to 6 are defined by a plurality of side lateral grooves 3a and 3b that connect the grooves 1a and 1b and the tread end T, respectively.
[0017]
Here, the center lateral groove 2 connecting the two circumferential grooves 1a and 1b has a bent portion 20 at the center, which is important for improving the circumferential edge component and preventing the occurrence of skid. . Thus, when the bent portion 20 is provided in the center of the center lateral groove 2, the edge component by bending, particularly the edge component in the circumferential direction, can be increased as compared with a normal linear lateral groove without the bent portion. A tread pattern strong against skidding can be realized.
[0018]
The bent portion 20 preferably has a refraction angle α shown in FIG. 2 of 70 to 120 °. That is, if the refraction angle α is less than 70 °, the tip of the bent portion 20 tends to be chipped, while if it exceeds 120 °, the water film destruction effect on the wet road and the hooking effect on the road surface on the bad road are reduced. There is a fear.
[0019]
On the other hand, the provision of the bent portion 20 in the center of the center lateral groove 2 may lead to the above-described reduction in mud repellency, and therefore the side lateral grooves 3a and 3b that connect the circumferential grooves 1a and 1b and the tread end T. Having a groove width that gradually increases from the circumferential grooves 1a and 1b toward the tread end T is important in order to improve the mud-penetration property and further the stone biting property. That is, since the contact pressure of the tread in the contact area is higher in the center area than in the width direction side area, mud and stone receive a force pushed outward from the tread center area through the lateral groove. Therefore, by gradually increasing the groove width of the side lateral grooves 3a and 3b toward the tread end T, mud and stone can be smoothly pushed out from the tread central region to the outside.
[0020]
In particular, as shown in FIG. 2, the groove widths of the side lateral grooves 3a and 3b are preferably gradually increased so that the ratio Wmax / Wmin between the maximum width Wmax and the minimum width Wmin is 1.2 to 2.5. . This is because when the ratio Wmax / Wmin is less than 1.2, the effect of pushing out the mud and stones from the tread central area to the outside becomes poor, and when the ratio exceeds 2.5, the lateral groove width in the tread side area is wide. As a result, the block area in the same region is reduced, so that there is a risk that the block rigidity is lowered and uneven wear, particularly heel and toe wear, occurs.
[0021]
In addition, the depth of the circumferential grooves 1a and 1b is 80 to 100% of the depth of the lateral grooves 2 and 3a and 3b, which is particularly advantageous for improving the skid resistance in the later stage of tread wear. That is, by setting the depth of the circumferential grooves 1a and 1b within the above range, an edge component can be ensured until the end of wear, so that the occurrence of skidding can be suppressed even at the end of wear.
[0022]
The circumferential grooves 1a and 1b are preferably arranged in a region of 25 to 65% of the tread half width TW / 2 which is a half of the tread width which is a distance between the tread ends T around the equator O of the tire. . This is because by arranging the circumferential grooves 1a and 1b in the above range, an edge component at the time of empty vehicle described later can be secured.
[0023]
Next, the length of the side lateral grooves 3a and 3b, that is, the axial length of the groove passing through the center of the lateral width of the side lateral groove, and the lateral groove wall from the tread end T to the central position of the circumferential width of the circumferential grooves 1a and 1b The distance L along the line is preferably 50% or more of the tread half width TW / 2 in order to continuously ensure a sufficient edge component. Specifically, the distance L is preferably about 30 to 80 mm.
[0024]
The width of the center lateral groove 2 is preferably 30 to 50% of the width of the side lateral grooves 3a and 3b, that is, the average groove width of the side lateral grooves 3a and 3b. This is because if the width of the center lateral groove 2 is less than 30% of the average groove width of the side lateral grooves, the mud repellency deteriorates, whereas if it exceeds 50%, the edge component of the ground contact surface may be reduced.
[0025]
Further, the center lateral groove 2 and the side lateral grooves 3a and 3b extend while being inclined with respect to the tire equator O, and the orientation of the tire with respect to the equator O is opposite between the center lateral groove 2 and the side lateral grooves 3a and 3b. This is advantageous for preventing vehicle flow. That is, by reversing the inclination of the tire with respect to the equator O between the center lateral groove 2 and the side lateral grooves 3a and 3b, forces canceling out the forces generated from the respective blocks are mutually generated, effectively acting to suppress the vehicle flow. To do.
[0026]
Here, as shown in FIG. 2, the inclination angle of each lateral groove with respect to the equator O of the tire is β, and the inclination angle of the side lateral grooves 3a and 3b with respect to the equator O of the center lateral groove 2 is γ. It is preferable that β and γ are 40 to 90 ° in order to ensure excellent traction.
[0027]
In addition, providing the narrow grooves 7 with a narrow opening width in each block of the block rows 4 to 6 sandwiched between the circumferential grooves 3a and 3b is effective for strengthening the edge component when the vehicle is idle. That is, when the vehicle is empty, that is, when the load applied to the tire is small, the contact area is about half that when the vehicle is loaded, so if the narrow grooves 7 are provided in the block rows 4 to 6 that are the contact area when empty, The edge component of time will be enhanced.
[0028]
The opening width of the narrow groove is preferably about 2 to 10 mm, and the depth is preferably about 10 to 75% of the depth of the circumferential grooves 3a and 3b. This is because if the width and depth of the narrow groove exceed the upper limit, the block rigidity is lowered and the stone biting property is also deteriorated. On the other hand, if the width and depth are less than the lower limit, the water film destruction effect may be reduced.
[0029]
Moreover, as for the shape of a narrow groove, it is preferable to make an edge component larger by providing a bending part like illustration.
[0030]
【Example】
A tire having the specifications shown in Table 1 based on the tread pattern of FIG. 2 was prototyped for size 11R22.5. Further, as a conventional example, a tire having the tread pattern previously shown in FIG. 1 and a tire having the tread pattern shown in FIG. The tread pattern shown in FIG. 3 is the same as the tread pattern shown in FIG. 2 except that a zigzag-shaped circumferential groove 1c is provided at the center of the tread width, and the circumferential grooves 1a to 1c are connected by lateral grooves 3c and 3d, respectively. In particular, the groove widths of the side lateral grooves 3a and 3b are constant.
[0031]
[Table 1]
[0032]
The prototype tire thus obtained was assembled on a 22.5 × 7.50 rim and adjusted to an internal pressure of 900 kPa, and then mounted on a 2DD dump truck vehicle and subjected to a turning test on a wet road. That is, water was poured into a concrete road surface circuit with a radius of 30 m at a water depth of 2 mm, the lap time for each circuit of the circuit was measured 10 times, and the average value was calculated. This test was performed when the tire was new, at the end of the wear of the tire, and at the middle of the middle wear. The measured values thus obtained are shown in Table 2 as an index when the measured value at the time of a new product of the comparative example is taken as 100. The larger this index, the shorter the lap time.
[0033]
[Table 2]
[0034]
【The invention's effect】
According to the present invention, it is possible to provide a tire that maintains the tread pattern performance, particularly wet performance, when the tread surface is worn even when the tread surface is worn.
[Brief description of the drawings]
FIG. 1 is a diagram showing a conventional tread pattern.
FIG. 2 is a diagram showing a tread pattern of the present invention.
FIG. 3 is a diagram showing a comparative tread pattern.
[Explanation of symbols]
1a circumferential groove 1b circumferential groove 2 center lateral groove 3a side lateral groove 3b side lateral groove 4 block row 5 block row 6 block row 7 narrow groove

Claims (7)

  1. Three rows are formed on the tire tread surface by two circumferential grooves extending zigzag along the equator of the tire, and a plurality of transverse grooves connecting between the circumferential grooves and between the circumferential grooves and the tread ends. A heavy-duty tire in which a block row of
    The center lateral groove that connects the two circumferential grooves has a bent portion at the center, while the side lateral groove that connects the circumferential groove and the tread end has a groove width that gradually increases from the circumferential groove toward the tread end. Further, the center lateral groove and the side lateral groove extend while inclining with respect to the equator of the tire, and the tire has a direction opposite to the equator and is opposite between the center lateral groove and the side lateral groove .
  2.   The heavy duty tire according to claim 1, wherein the depth of the circumferential groove is 80 to 100% of the depth of the lateral groove.
  3.   The heavy duty tire according to claim 1 or 2, wherein the circumferential groove is arranged in an area of 25 to 65% of a half width of the tread centering on the equator of the tire.
  4.   The heavy duty tire according to any one of claims 1 to 3, wherein a length of the side lateral groove is 50% or more of a half width of the tread.
  5.   The heavy duty tire according to any one of claims 1 to 4, wherein the width of the center lateral groove is 30 to 50% of the width of the side lateral groove.
  6. The heavy load tire according to claim 1 , wherein an inclination angle of the center lateral groove and the side lateral groove with respect to the equator is 40 to 90 °.
  7. The heavy load tire according to any one of claims 1 to 6 , wherein each block in the block row sandwiched between the circumferential grooves has a narrow groove with a narrow opening width.
JP2002265113A 2002-09-11 2002-09-11 Heavy duty tire Active JP4149219B2 (en)

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JP4149219B2 true JP4149219B2 (en) 2008-09-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104275991A (en) * 2013-07-12 2015-01-14 住友橡胶工业株式会社 Heavy load applied tire
US10343460B2 (en) 2015-06-15 2019-07-09 Toyo Tire Corporation Pneumatic tire

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JP4499467B2 (en) * 2004-04-15 2010-07-07 株式会社ブリヂストン Pneumatic tire
JP5297778B2 (en) * 2008-02-27 2013-09-25 株式会社ブリヂストン Pneumatic tire
US9168791B2 (en) * 2008-08-11 2015-10-27 The Goodyear Tire & Rubber Company Heavy duty tire
KR100995063B1 (en) 2008-10-30 2010-11-18 금호타이어 주식회사 Tread pattern of off-road tire
JP5503775B1 (en) * 2013-04-30 2014-05-28 株式会社ブリヂストン Heavy duty pneumatic tire
JP5913190B2 (en) * 2013-05-02 2016-04-27 住友ゴム工業株式会社 Heavy duty tire
JP6291356B2 (en) * 2014-05-30 2018-03-14 東洋ゴム工業株式会社 Pneumatic tire
JP6261457B2 (en) * 2014-06-20 2018-01-17 東洋ゴム工業株式会社 Pneumatic tire
JP6432518B2 (en) * 2014-10-16 2018-12-05 横浜ゴム株式会社 Pneumatic tire
JP6229726B2 (en) * 2014-07-23 2017-11-15 横浜ゴム株式会社 Heavy duty pneumatic tire
CN106660404B (en) * 2014-10-20 2018-05-15 横滨橡胶株式会社 Pneumatic tire
JP6229724B2 (en) * 2014-07-23 2017-11-15 横浜ゴム株式会社 Heavy duty pneumatic tire
RU2633457C1 (en) * 2014-07-23 2017-10-12 Дзе Йокогама Раббер Ко., Лтд. Pneumatic tyre
AU2015293479B9 (en) * 2014-07-23 2017-07-13 The Yokohama Rubber Co., Ltd. Heavy duty pneumatic tire
WO2016013600A1 (en) * 2014-07-23 2016-01-28 横浜ゴム株式会社 Heavy duty pneumatic tire
WO2016067945A1 (en) * 2014-10-31 2016-05-06 横浜ゴム株式会社 Heavy-duty pneumatic tire
JP6229723B2 (en) * 2014-07-23 2017-11-15 横浜ゴム株式会社 Heavy duty pneumatic tire
AU2015293165B2 (en) * 2014-07-23 2017-08-03 The Yokohama Rubber Co., Ltd. Heavy duty pneumatic tire
JP6367692B2 (en) * 2014-11-18 2018-08-01 東洋ゴム工業株式会社 Pneumatic tire
CN106394139A (en) * 2016-11-30 2017-02-15 中国化工橡胶桂林轮胎有限公司 Motor lorry medium-short-distance tire tread pattern
CN106515317A (en) * 2016-11-30 2017-03-22 中国化工橡胶桂林轮胎有限公司 Tread pattern for truck mine tyre
JP2018135064A (en) * 2017-02-23 2018-08-30 横浜ゴム株式会社 Pneumatic tire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104275991A (en) * 2013-07-12 2015-01-14 住友橡胶工业株式会社 Heavy load applied tire
US10343460B2 (en) 2015-06-15 2019-07-09 Toyo Tire Corporation Pneumatic tire

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