JP3720519B2 - Pneumatic radial tires for passenger cars or light trucks traveling on rough roads - Google Patents

Pneumatic radial tires for passenger cars or light trucks traveling on rough roads Download PDF

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Publication number
JP3720519B2
JP3720519B2 JP07354497A JP7354497A JP3720519B2 JP 3720519 B2 JP3720519 B2 JP 3720519B2 JP 07354497 A JP07354497 A JP 07354497A JP 7354497 A JP7354497 A JP 7354497A JP 3720519 B2 JP3720519 B2 JP 3720519B2
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Japan
Prior art keywords
groove
circumferential
steeply inclined
depth
pneumatic radial
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JP07354497A
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JPH10264613A (en
Inventor
裕司 加藤
司 羽田
信貴 田辺
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Bridgestone Corp
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Bridgestone Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1272—Width of the sipe
    • B60C11/1281—Width of the sipe different within the same sipe, i.e. enlarged width portion at sipe bottom or along its length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C11/125—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern arranged at the groove bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0374—Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は荒れた路面を走行する乗用車乃至ライト・トラック用空気入りラジアル・タイヤに関するもので、特に、左右のビード・コアーに巻回されてビード部に係留されたラジアル・カーカスと、該ラジアル・カーカスのクラウン部ラジアル方向外側に配置されたベルトと、該ベルトのラジアル方向外側に配置されたトレッドとを備えた乗用車乃至ライト・トラック用空気入りラジアル・タイヤに関するものである。
【０００２】
【発明が解決しようとする課題】
荒れた舗装路や農道などの非舗装路などに代表される、いわゆる荒れた路面をタイヤが走行すると、路上に散乱している小石、ガラスや金属などの破片およびボルト等の異物などによって、タイヤのトレッド部に設けられた溝底にカット損傷を受けやすい。溝底にカット損傷を受けたタイヤをそのまま継続して使用していると、カット損傷がベルトまで進行して損傷個所から水分が侵入し、ベルトを構成しているスチール・コードに錆びが発生し、致命的なバースト故障を誘発することがある。
上記のようなカット損傷を受けにくくするために、タイヤのトレッド部に設けられた溝を浅くすることによって溝底下のゴムの厚みを増加し、カット損傷がベルトまで進行しにくいようにすると、タイヤ転動時に溝が開閉する動きが小さくなるので、いったん溝に咬み込んだ石などの異物をいつまでも吐き出さずに、かえってカット損傷が増加することがある。
【０００３】
本発明の目的は、上記のような従来技術の不具合を解消して、石などの異物による溝底のカット損傷を受けにくい、荒れた路面を走行する乗用車乃至ライト・トラック用空気入りラジアル・タイヤを提供することである。
【０００４】
【課題を解決するための手段】
上記目的を達成するために、本発明の空気入りタイヤは、左右一対のビード・コアーに巻回されてビード部に係留されたラジアル・カーカスと、該ラジアル・カーカスのクラウン部ラジアル方向外側に配置されたベルトと、該ベルトのラジアル方向外側に配置されたトレッドとを備えた空気入りタイヤにおいて、（１）トレッドには、少なくとも、周方向また実質的に周方向に延びる周方向溝と、周方向に対して小さな角度で傾斜した方向に延びる急傾斜溝とが設けられ、（２）該急傾斜溝の少なくとも一部領域では、溝深さが該周方向溝の溝深さの２０乃至６０％となるように溝の底上げが施され、（３）該急傾斜溝の上記溝の底上げが施された領域では、溝底からさらにラジアル方向内側に延びる細溝が設けられ、（４）該細溝の溝幅は０．５乃至２．５ｍｍであり、（５）該急傾斜溝は、周方向に対してそれより大きな角度で傾斜する緩傾斜溝を介してのみ周方向溝に開口し、前記底上げと前記細溝との形成は、前記周方向溝、前記急傾斜溝、前記緩傾斜溝のうち、急傾斜溝のみに施されてなることを特徴とする、荒れた路面を走行する乗用車乃至ライト・トラック用空気入りラジアル・タイヤである。
【０００５】
上記目的を達成するために、本発明の空気入りタイヤでは、
該細溝の溝深さは該周方向溝の溝深さの４０乃至８０％であること、および
該急傾斜溝は周方向に対して５乃至３０度の小さな角度で傾斜した方向に延びていること
が好ましい。
【０００６】
発明者などが廃品タイヤを調査した結果、前述のカット損傷は、周方向に対して５乃至３０度程度の小さな角度で傾斜した方向に延びる急傾斜溝で多発していることが判明した。
本発明の空気入りタイヤは上記のような構成であり、特に、急傾斜溝の溝深さは周方向溝の溝深さの２０乃至６０％と、浅く設定され溝底下のゴムの厚みが増加されているので、カット損傷がベルトまで進行することを抑制するような構成となっている。
しかしながら、前述のように、カット損傷を受けにくくするために、タイヤのトレッド部に設けられた溝を浅くすることによって溝底下のゴムの厚みを増加すると、タイヤ転動時に溝が開閉する動きが小さくなるので、いったん溝に咬み込んだ石などの異物をいつまでも吐き出さずに、かえってカット損傷が増加することがある。
本発明の空気入りタイヤでは、上記のように、急傾斜溝の溝底からさらにラジアル方向内側に延びる細溝が設けられ、この細溝の溝幅は０．５乃至２．５ｍｍで、溝深さは周方向溝の溝深さの４０乃至８０％であるので、タイヤ転動時に溝が開閉する動きが大きくなり、いったん溝に咬み込んだ石などの異物を容易に吐き出してしまい、カット損傷が減少する。
また、急傾斜溝の溝底からさらにラジアル方向内側に延びる細溝が設けられたことによって、摩耗中期以降も排水性能が確保されるとともに見た目の摩耗外観の悪化を防止することができる。
【０００７】
【発明の実施の形態】
以下、本発明に従う実施例のタイヤおよび従来例のタイヤについて図面を参照して説明する。タイヤ・サイズは、いずれも、ＬＴ１９５Ｒ１４である。
【０００８】
図１は本発明による実施例のタイヤのトレッド・パターンの一部拡大図であって、本発明による実施例のタイヤは、図示を省略してあるが左右一対のビード・コアーに巻回されてビード部に係留されたラジアル・カーカスと、ラジアル・カーカスのクラウン部ラジアル方向外側に配置されたベルトと、ベルトのラジアル方向外側に配置されたトレッドとを備えた空気入りタイヤである。
本発明による実施例のタイヤのトレッドには、図１に示すように、周方向に延びる３本の周方向溝１と、周方向に対して８度の比較的に小さな角度で傾斜した方向に延びる多数の急傾斜溝２と、周方向に対して比較的に大きな角度で傾斜した方向に延びる多数の緩傾斜溝３とが設けられている。
図２は図１のＡ−Ａ断面図である。急傾斜溝２の少なくとも一部領域では、図２に示すように、溝深さｄ1 ＝３．０ｍｍが周方向溝の溝深さ（９．９ｍｍ）の３０．３％となるように溝の底上げが施され、溝底からさらにラジアル方向内側に延びる細溝４が設けられ、この細溝４の溝幅ｗは１．２ｍｍで、溝深さｄ2 は５ｍｍで、周方向溝の溝深さ（９．９ｍｍ）の５０．５％に相当する。
図３は図２に相当する急傾斜溝２と細溝４の断面図で、変形実施例である。
【０００９】
従来例の空気入りタイヤは、急傾斜溝２は溝の底上げが施されずに、周方向溝の溝深さ（９．９ｍｍ）と同じ溝深さで、細溝４が設けられていないことが上記実施例の空気入りタイヤとの主な相違点である。
【００１０】
上記本発明に従う実施例の空気入りタイヤと上記従来例の空気入りタイヤについて、小石、ガラスや金属などの破片およびボルトなどの異物が路上に散乱している荒れた舗装路や農道などの非舗装路で、トレッド部のカット損傷の度合いの比較試験を実施した。
３万ｋｍ走行後、トレッド部のカット損傷を調べたところ、上記本発明に従う実施例の空気入りタイヤではカット損傷がほとんど発生していなかったが、上記従来例の空気入りタイヤでは急傾斜溝２のほとんどすべてにカット損傷が発生していた。
【００１１】
【発明の効果】
上記の評価結果から、本発明に基づく実施例の空気入りタイヤは従来例の空気入りタイヤと比べて、耐カット損傷性能が優れていることが分かる。
【図面の簡単な説明】
【図１】本発明による空気入りタイヤのトレッド・パターンの一部拡大図である。
【図２】図１のＡ−Ａ断面図である。
【図３】変形実施例の断面図である。
【符号の説明】
１ 周方向溝
２ 急傾斜溝
３ 緩傾斜溝
４ 細溝[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic radial tire for passenger cars or light trucks traveling on rough roads, and in particular, a radial carcass wound around left and right bead cores and moored at a bead portion, and the radial The present invention relates to a pneumatic radial tire for a passenger car or a light truck including a belt disposed radially outward of the crown portion of the carcass and a tread disposed radially outward of the belt.
[0002]
[Problems to be solved by the invention]
When a tire travels on a so-called rough road surface represented by a rough paved road or a non-paved road such as an agricultural road, the tires are scattered by pebbles scattered on the road, broken pieces of glass or metal, and foreign matters such as bolts. The bottom of the groove provided in the tread portion is susceptible to cut damage. If you continue to use a tire that has been cut damaged at the groove bottom, the cut damage will proceed to the belt, moisture will enter from the damaged area, and the steel cords that make up the belt will rust. May cause fatal burst failure.
In order to make it difficult to suffer from cut damage as described above, by increasing the thickness of the rubber under the groove bottom by shallowing the groove provided in the tread portion of the tire, it is difficult for the cut damage to progress to the belt. Since the movement of opening and closing of the groove becomes small during rolling, cut damage may increase instead of expelling a foreign object such as a stone once biting into the groove.
[0003]
The object of the present invention is to eliminate the above-mentioned problems of the prior art, and to prevent a groove bottom cut damage by a foreign object such as a stone and to travel on a rough road surface, a pneumatic radial tire for a passenger car or a light truck. Is to provide.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a pneumatic tire according to the present invention is arranged on a radial carcass wound around a pair of left and right bead cores and moored at a bead portion, and disposed radially outward in the crown portion of the radial carcass. In the pneumatic tire provided with the belt and the tread disposed on the outer side in the radial direction of the belt, (1) the tread includes at least a circumferential groove extending in the circumferential direction and substantially in the circumferential direction; A steeply inclined groove extending in a direction inclined at a small angle with respect to the direction, and (2) in at least a partial region of the steeply inclined groove, the groove depth is 20 to 60 of the groove depth of the circumferential groove. (3) In the region of the steeply inclined groove where the groove is raised, a narrow groove extending further inward in the radial direction from the groove bottom is provided, and (4) The groove width of the narrow groove is Ri .5 to 2.5mm der, (5) said acute inclined groove is opened only in the circumferential groove through the gently slant groove which inclines at an angle larger than the circumferential direction, the said raised fine The groove is formed only on the steeply inclined groove among the circumferential groove, the steeply inclined groove, and the gently inclined groove, and is used for a passenger car or a light truck traveling on a rough road surface. It is a pneumatic radial tire.
[0005]
In order to achieve the above object, in the pneumatic tire of the present invention,
The groove depth of the narrow groove is 40 to 80% of the groove depth of the circumferential groove, and the steeply inclined groove extends in a direction inclined at a small angle of 5 to 30 degrees with respect to the circumferential direction. Preferably it is.
[0006]
As a result of investigations of waste tires by the inventors, it has been found that the above-described cut damage frequently occurs in steeply inclined grooves extending in a direction inclined at a small angle of about 5 to 30 degrees with respect to the circumferential direction.
The pneumatic tire according to the present invention is configured as described above. In particular, the groove depth of the steeply inclined groove is set to be 20 to 60% of the groove depth of the circumferential groove, and the thickness of the rubber under the groove bottom is increased. Therefore, the cut damage is prevented from proceeding to the belt.
However, as described above, when the thickness of the rubber under the groove bottom is increased by shallowing the groove provided in the tread portion of the tire in order to make it less susceptible to cut damage, the movement of the groove opens and closes when the tire rolls. As it becomes smaller, the cut damage may increase instead of expelling a foreign object such as a stone once biting into the groove.
In the pneumatic tire of the present invention, as described above, a narrow groove extending radially inward from the groove bottom of the steeply inclined groove is provided, and the groove width of the narrow groove is 0.5 to 2.5 mm, and the groove depth is Since the depth of the groove is 40 to 80% of the groove depth of the circumferential groove, the movement of the groove when the tire rolls increases, and foreign objects such as stones once bite into the groove are easily discharged, resulting in cut damage. Decrease.
Further, by providing the narrow groove extending further inward in the radial direction from the groove bottom of the steeply inclined groove, the drainage performance can be secured even after the middle stage of wear and the appearance appearance can be prevented from deteriorating.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, tires of examples and conventional tires according to the present invention will be described with reference to the drawings. Both tire sizes are LT195R14.
[0008]
FIG. 1 is a partially enlarged view of a tread pattern of a tire according to an embodiment of the present invention. The tire according to an embodiment of the present invention is wound around a pair of left and right bead cores although not shown. A pneumatic tire including a radial carcass moored at a bead portion, a belt disposed radially outward of the crown portion of the radial carcass, and a tread disposed radially outward of the belt.
As shown in FIG. 1, the tread of the tire according to the embodiment of the present invention includes three circumferential grooves 1 extending in the circumferential direction and a direction inclined at a relatively small angle of 8 degrees with respect to the circumferential direction. A number of steeply inclined grooves 2 extending and a number of gently inclined grooves 3 extending in a direction inclined at a relatively large angle with respect to the circumferential direction are provided.
2 is a cross-sectional view taken along the line AA in FIG. In at least a partial region of the steeply inclined groove 2, as shown in FIG. 2, the groove depth d1 = 3.0 mm is 30.3% of the circumferential groove depth (9.9 mm). A narrow groove 4 is provided which is raised from the bottom and extends further radially inward from the groove bottom. The groove width w of the narrow groove 4 is 1.2 mm, the groove depth d2 is 5 mm, and the groove depth of the circumferential groove. This corresponds to 50.5% of (9.9 mm).
FIG. 3 is a sectional view of the steeply inclined groove 2 and the narrow groove 4 corresponding to FIG. 2, and is a modified embodiment.
[0009]
In the conventional pneumatic tire, the steeply inclined groove 2 is not provided with a raised bottom, and the groove depth is the same as the groove depth (9.9 mm) of the circumferential groove, and the narrow groove 4 is not provided. Is the main difference from the pneumatic tire of the above embodiment.
[0010]
About the pneumatic tire of the embodiment according to the present invention and the pneumatic tire of the conventional example, pebbles, debris such as glass and metal, and non-paved roads such as rough paved roads and agricultural roads where foreign matters such as bolts are scattered on the road On the road, a comparative test of the degree of cut damage in the tread portion was performed.
When the cut damage of the tread portion was examined after traveling 30,000 km, the cut tire damage hardly occurred in the pneumatic tire of the example according to the present invention, but the steeply inclined groove 2 in the conventional pneumatic tire described above. Almost all of them had cut damage.
[0011]
【The invention's effect】
From the above evaluation results, it can be seen that the pneumatic tires of the examples based on the present invention have better cut damage resistance than the conventional pneumatic tires.
[Brief description of the drawings]
FIG. 1 is a partially enlarged view of a tread pattern of a pneumatic tire according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is a cross-sectional view of a modified embodiment.
[Explanation of symbols]
1 Circumferential groove 2 Steeply inclined groove 3 Slowly inclined groove 4 Narrow groove

Claims (3)

左右一対のビード・コアーに巻回されてビード部に係留されたラジアル・カーカスと、該ラジアル・カーカスのクラウン部ラジアル方向外側に配置されたベルトと、該ベルトのラジアル方向外側に配置されたトレッドとを備えた空気入りタイヤにおいて、（１）トレッドには、少なくとも、周方向また実質的に周方向に延びる周方向溝と、周方向に対して小さな角度で傾斜した方向に延びる急傾斜溝とが設けられ、（２）該急傾斜溝の少なくとも一部領域では、溝深さが該周方向溝の溝深さの２０乃至６０％となるように溝の底上げが施され、（３）該急傾斜溝の上記溝の底上げが施された領域では、溝底からさらにラジアル方向内側に延びる細溝が設けられ、（４）該細溝の溝幅は０．５乃至２．５ｍｍであり、（５）該急傾斜溝は、周方向に対してそれより大きな角度で傾斜する緩傾斜溝を介してのみ周方向溝に開口し、前記底上げと前記細溝との形成は、前記周方向溝、前記急傾斜溝、前記緩傾斜溝のうち、急傾斜溝のみに施されてなることを特徴とする、荒れた路面を走行する乗用車乃至ライト・トラック用空気入りラジアル・タイヤ。A radial carcass wound around a pair of right and left bead cores and moored at a bead, a belt disposed radially outward of the crown of the radial carcass, and a tread disposed radially outward of the belt (1) The tread includes at least a circumferential groove extending in the circumferential direction or substantially in the circumferential direction, and a steeply inclined groove extending in a direction inclined at a small angle with respect to the circumferential direction. (2) In at least a partial region of the steeply inclined groove, the groove is raised so that the groove depth is 20 to 60% of the groove depth of the circumferential groove, and (3) the In the region of the steeply inclined groove where the bottom of the groove is raised, a narrow groove extending further inward in the radial direction from the groove bottom is provided. (4) The groove width of the narrow groove is 0.5 to 2.5 mm, (5) The steeply inclined groove The circumferential groove is opened only through a gently inclined groove that is inclined at a larger angle with respect to the direction. The raised bottom and the narrow groove are formed by the circumferential groove, the steeply inclined groove, and the gently inclined groove. Among them, a pneumatic radial tire for passenger cars or light trucks traveling on rough roads, characterized by being applied only to steeply inclined grooves . 該細溝の溝深さは該周方向溝の溝深さの４０乃至８０％であることを特徴とする請求項１記載の乗用車乃至ライト・トラック用空気入りラジアル・タイヤ。 The pneumatic radial tire for a passenger car or a light truck according to claim 1, wherein the groove depth of the narrow groove is 40 to 80% of the groove depth of the circumferential groove. 該急傾斜溝は周方向に対して５乃至３０度の小さな角度で傾斜した方向に延びていることを特徴とする請求項１乃至２記載の乗用車乃至ライト・トラック用空気入りラジアル・タイヤ。 3. The pneumatic radial tire for a passenger car or a light truck according to claim 1, wherein the steeply inclined groove extends in a direction inclined at a small angle of 5 to 30 degrees with respect to the circumferential direction.
JP07354497A 1997-03-26 1997-03-26 Pneumatic radial tires for passenger cars or light trucks traveling on rough roads Expired - Lifetime JP3720519B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP07354497A JP3720519B2 (en) 1997-03-26 1997-03-26 Pneumatic radial tires for passenger cars or light trucks traveling on rough roads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP07354497A JP3720519B2 (en) 1997-03-26 1997-03-26 Pneumatic radial tires for passenger cars or light trucks traveling on rough roads

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JPH10264613A JPH10264613A (en) 1998-10-06
JP3720519B2 true JP3720519B2 (en) 2005-11-30

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EP4360914A1 (en) * 2022-10-26 2024-05-01 Continental Reifen Deutschland GmbH Pneumatic tyre for vehicles

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JP4189980B2 (en) * 1998-11-27 2008-12-03 株式会社ブリヂストン Pneumatic tire
JP4518641B2 (en) * 2000-07-18 2010-08-04 株式会社ブリヂストン Pneumatic tire
FR2924981B1 (en) * 2007-12-17 2009-11-27 Michelin Soc Tech TIRE TREAD FOR SNOW TIRE.
AU2014285252B2 (en) * 2013-07-05 2017-10-05 Sumitomo Rubber Industries, Ltd. Pneumatic tire
CN104648048B (en) * 2015-01-29 2017-03-22 潍坊市跃龙橡胶有限公司 Special all-steel radial truck tire for Middle East
CN107685600B (en) * 2016-08-03 2020-09-08 横滨橡胶株式会社 Pneumatic tire
JP7110699B2 (en) * 2018-04-18 2022-08-02 住友ゴム工業株式会社 tire

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4360914A1 (en) * 2022-10-26 2024-05-01 Continental Reifen Deutschland GmbH Pneumatic tyre for vehicles

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