JP3914625B2 - 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
JP3914625B2
JP3914625B2 JP00196498A JP196498A JP3914625B2 JP 3914625 B2 JP3914625 B2 JP 3914625B2 JP 00196498 A JP00196498 A JP 00196498A JP 196498 A JP196498 A JP 196498A JP 3914625 B2 JP3914625 B2 JP 3914625B2
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Prior art keywords
groove
region
inclined groove
degrees
circumferential
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JPH11192815A (en
Inventor
一郎 服部
昭 栗間
泰広 濱田
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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
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1369—Tie bars for linking block elements and bridging the groove

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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、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複数本の周方向溝と、周方向に対して傾斜した方向に延び、隣接する該周方向溝に開口する多数の傾斜溝とが設けられ、該傾斜溝は、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領域と、周方向に対して大きな角度で傾斜した方向に延びる緩傾斜溝領域と、該急傾斜溝領域と該緩傾斜溝領域とをなめらかに結ぶ連結領域とで形成されている、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。
【０００３】
本発明の目的は、上記のような急傾斜溝領域と緩傾斜溝領域とを有する傾斜溝がトレッドに設けられたタイヤであって、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、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複数本の周方向溝と、周方向に対して傾斜した方向に延び、隣接する該周方向溝に開口する多数の傾斜溝とが設けられ、該傾斜溝は、周方向に対して５乃至３０度の角度で傾斜した方向に直線的に延びる急傾斜溝領域と、周方向に対して３５乃至７０度の角度で傾斜した方向に直線的に延びる緩傾斜溝領域と、該急傾斜溝領域と該緩傾斜溝領域とを傾斜角度を連続的に変化させながら結ぶ連結領域とで形成されている空気入りタイヤにおいて、（１）該傾斜溝は、該急傾斜溝領域では、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、（２）該緩傾斜溝領域では、該傾斜溝の少なくとも一方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であ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、該傾斜溝は、該緩傾斜溝領域では、溝深さが該周方向溝の溝深さの７０乃至９５％となるように溝の底上げが施されていること、該緩傾斜溝領域から該連結領域を経て該急傾斜溝領域にかけて、該傾斜溝の少なくとも一方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であること、該緩傾斜溝領域の少なくとも一部では、該傾斜溝の両方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であること、該トレッドが、トレッド幅の３０％程度を占めるトレッド中央領域と該トレッド中央領域の両側に配置された左右１対のトレッド両側領域とで形成され、該周方向溝はトレッド中央領域に設けられた１乃至２本の中央周方向溝とトレッド両側領域に設けられた左右各１本の両側周方向溝とよりなり、該傾斜溝は該央周方向溝と該央周方向溝に隣接する該両側周方向溝とに開口していること、該緩傾斜溝領域のうち該傾斜溝が該両側周方向溝に開口する個所では、該緩傾斜溝領域から該急傾斜溝領域にかけてまたは該緩傾斜溝領域から該連結領域をまたいで該急傾斜溝領域にかけて、該傾斜溝の少なくとも一方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であることが好ましい。
【０００６】
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、該傾斜溝は、該急傾斜溝領域では、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。また、該緩傾斜溝領域では、該傾斜溝の少なくとも一方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であるので、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うような構成となっていて、カット損傷が減少する。
【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、２と、周方向に対して傾斜した方向に延びる傾斜溝３とが設けられている。傾斜溝３は、周方向に対して５乃至３０度の角度で傾斜した方向に直線的に延びる急傾斜溝領域３１と、周方向に対して３５乃至７０度の角度で傾斜した方向に直線的に延びる緩傾斜溝領域３２と、急傾斜溝領域３１と緩傾斜溝領域３２とを傾斜角度を連続的に変化させながら結ぶ連結領域３３とで形成されている。傾斜溝３は、トレッド中央領域に設けられた中央周方向溝１とトレッド両側領域に設けられた両側周方向溝２とに開口し、急傾斜溝領域３１では溝が周方向に対して約１０度の角度で傾斜した方向に延び、緩傾斜溝領域３２では溝が周方向に対して３３乃至４６度の範囲内の角度で傾斜した方向に直線的に延びている。図２は図１のＡ−Ａ断面図である。傾斜溝３は、急傾斜溝領域３１では、溝深さｄ1 が周方向溝の溝深さＤの２０乃至６０％となるように溝の底上げが施されていて、本実施例ではｄ1 ＝３．０ｍｍでＤ＝９．９ｍｍであるから、ｄ1 ／Ｄ＝３０．３％となっている。緩傾斜溝領域３２でも若干溝の底上げが施されていて、本実施例ではｄ2 ＝８．３ｍｍでＤ＝９．９ｍｍであるから、ｄ2 ／Ｄ＝８３．８％となっている。図３は図１のＢ−Ｂ断面図である。傾斜溝３は、緩傾斜溝領域３２のうち傾斜溝３が両側周方向溝２に開口する個所では、図示のごとく、左側の溝側壁角度αが３度であるが、右側の溝側壁は２段溝となっていて溝側壁角度β、γがラジアル方向外側ではγ＝４５度でラジアル方向内側ではβ＝９度である。本実施例では緩傾斜溝領域３２から連結領域３３までが２段溝となっているが、緩傾斜溝領域３２から連結領域３３をまたいで急傾斜溝領域３１にかけて２段溝とすることも可能である。また、本実施例では右側の溝側壁だけが２段溝となっているが、左右両方の溝側壁を２段溝とすることも可能である。
【０００９】
従来例の空気入りタイヤは、傾斜溝３は溝の底上げが施されずに周方向溝１、２の溝深さ（９．９ｍｍ）と同じ溝深さであること、および、傾斜溝３は２段溝となっ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傾斜溝３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】図１のＢ−Ｂ断面図である。
【符号の説明】
１ 周方向溝
２ 周方向溝
３ 傾斜溝[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 A belt disposed radially outward of the crown portion of the carcass and a tread disposed radially outward of the belt, wherein the tread includes at least a plurality of circumferential directions extending in the circumferential direction and substantially in the circumferential direction. A groove and a plurality of inclined grooves extending in a direction inclined with respect to the circumferential direction and opening in the adjacent circumferential groove are provided, and the inclined groove extends in a direction inclined at a small angle with respect to the circumferential direction. A steeply inclined groove region, a gently inclined groove region extending in a direction inclined at a large angle with respect to the circumferential direction, and a connecting region that smoothly connects the steeply inclined groove region and the gently inclined groove region. It is, to a rough Passenger car or light truck pneumatic radial tire for traveling on a road surface.
[0002]
[Problems to be solved by the invention]
When a tire runs 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 objects 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.
[0003]
An object of the present invention is a tire in which a slope groove having a steep slope groove area and a gently slope groove area as described above is provided on a tread, and is less susceptible to cut damage to the groove bottom due to foreign matters such as stones. The present invention provides a pneumatic radial tire for a passenger car or a light truck that travels on a road surface.
[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 right and left bead cores and moored at a bead portion, and disposed radially outward in a crown portion of the radial carcass. And at least a plurality of circumferential grooves extending in the circumferential direction and substantially in the circumferential direction, and inclined with respect to the circumferential direction. And a plurality of inclined grooves that open to adjacent circumferential grooves, and the inclined grooves extend linearly in a direction inclined at an angle of 5 to 30 degrees with respect to the circumferential direction. The inclination angle of the groove region, the gently inclined groove region linearly extending in a direction inclined at an angle of 35 to 70 degrees with respect to the circumferential direction, and the steeply inclined groove region and the gently inclined groove region are continuously changed. consolidated connecting while (1) In the steeply inclined groove region, the inclined groove is formed so that the groove depth is 20 to 60% of the groove depth of the circumferential groove. (2) In the gently inclined groove region, at least one groove side wall angle of the inclined groove is 30 to 60 degrees on the radially outer side and 0 to 20 degrees on the radially inner side. It is a pneumatic radial tire for passenger cars or light trucks traveling on rough roads.
[0005]
In order to achieve the above object, in the pneumatic tire of the present invention, the inclined groove is formed so that the groove depth is 70 to 95% of the groove depth of the circumferential groove in the gently inclined groove region. The angle of the side wall of at least one of the inclined grooves is 30 to 60 degrees on the radially outer side from the gently inclined groove region to the steeply inclined groove region, and the inner side in the radial direction. 0 to 20 degrees, and in at least a part of the gently inclined groove area, the groove sidewall angles of both of the inclined grooves are 30 to 60 degrees on the radially outer side and 0 to 20 degrees on the radially inner side. The tread is formed by a tread central region occupying about 30% of the tread width and a pair of left and right tread side regions disposed on both sides of the tread central region, and the circumferential groove is provided in the tread central region. It consists of one or two central circumferential grooves and one left and right circumferential grooves provided in both sides of the tread, and the inclined grooves are adjacent to the central circumferential grooves and the central circumferential grooves. The groove is open to the circumferential groove, and the portion of the gently inclined groove region where the inclined groove opens to the circumferential groove on both sides extends from the gently inclined groove region to the steeply inclined groove region or the gently inclined groove region. From the region to the steeply inclined groove region across the connecting region, it is preferable that the groove sidewall angle of at least one of the inclined grooves is 30 to 60 degrees on the radially outer side and 0 to 20 degrees on the radially inner side.
[0006]
The pneumatic tire of the present invention is configured as described above. In particular, the inclined groove has a groove depth of 20 to 60% of the groove depth of the circumferential groove in the steeply inclined groove region. Since the bottom of the groove is raised, the cut damage is prevented from proceeding to the belt. Further, in the gently inclined groove region, the groove side wall angle of at least one of the inclined grooves is 30 to 60 degrees on the radially outer side and 0 to 20 degrees on the radially inner side. The structure is such that foreign matter is easily discharged, and cut damage is reduced.
[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 is provided with three circumferential grooves 1 and 2 extending in the circumferential direction and inclined grooves 3 extending in a direction inclined with respect to the circumferential direction. It has been. The inclined groove 3 includes a steeply inclined groove region 31 that linearly extends in a direction inclined at an angle of 5 to 30 degrees with respect to the circumferential direction, and a linear direction in a direction inclined at an angle of 35 to 70 degrees with respect to the circumferential direction. , And a connecting region 33 that connects the steeply inclined groove region 31 and the gently inclined groove region 32 while continuously changing the inclination angle . The inclined groove 3 opens into a central circumferential groove 1 provided in the tread central region and both circumferential grooves 2 provided in both side regions of the tread. In the steeply inclined groove region 31, the groove is approximately 10 with respect to the circumferential direction. In the gently inclined groove region 32, the groove extends linearly in a direction inclined at an angle within a range of 33 to 46 degrees with respect to the circumferential direction. 2 is a cross-sectional view taken along the line AA in FIG. In the steeply inclined groove region 31, the inclined groove 3 is raised at the bottom of the groove so that the groove depth d1 is 20 to 60% of the groove depth D of the circumferential groove. In this embodiment, d1 = 3. Since 0.0 mm and D = 9.9 mm, d 1 /D=30.3%. Even in the gently inclined groove region 32, the bottom of the groove is slightly raised. In this embodiment, d2 = 8.3 mm and D = 9.9 mm, so that d2 / D = 83.8%. 3 is a cross-sectional view taken along the line BB of FIG. In the inclined groove 3, the left groove side wall angle α is 3 degrees as shown in the figure where the inclined groove 3 opens into the circumferential grooves 2 on both sides of the gently inclined groove region 32, but the right groove side wall is 2 degrees. The groove side wall angles β, γ are γ = 45 degrees on the radially outer side and β = 9 degrees on the radially inner side. In this embodiment, the step from the gently inclined groove region 32 to the connecting region 33 is a two-step groove, but it is also possible to form a two-step groove from the gently inclined groove region 32 to the steeply inclined groove region 31. It is. In this embodiment, only the right groove side wall is a two-step groove, but both the left and right groove side walls can be a two-step groove.
[0009]
In the conventional pneumatic tire, the inclined groove 3 has the same groove depth as the groove depth (9.9 mm) of the circumferential grooves 1 and 2 without being raised, and the inclined groove 3 The main difference from the pneumatic tire of the above example is that it is not a two-step groove.
[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 on which foreign matters such as bolts are scattered On the road, a comparative test of the degree of cut damage in the tread portion was performed.
After traveling 30,000 km, when the cut damage of the tread portion was examined, almost no cut damage occurred in the pneumatic tire of the example according to the present invention. Almost everything 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.
3 is a cross-sectional view taken along the line BB in FIG.
[Explanation of symbols]
1 circumferential groove 2 circumferential groove 3 inclined groove

Claims (6)

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、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複数本の周方向溝と、周方向に対して傾斜した方向に延び、隣接する該周方向溝に開口する多数の傾斜溝とが設けられ、該傾斜溝は、周方向に対して５乃至３０度の角度で傾斜した方向に直線的に延びる急傾斜溝領域と、周方向に対して３５乃至７０度の角度で傾斜した方向に直線的に延びる緩傾斜溝領域と、該急傾斜溝領域と該緩傾斜溝領域とを傾斜角度を連続的に変化させながら結ぶ連結領域とで形成されている空気入りタイヤにおいて、（１）該傾斜溝は、該急傾斜溝領域では、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、（２）少なくとも該緩傾斜溝領域では、該傾斜溝の少なくとも一方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であ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 portion, a belt disposed radially outward of the crown portion of the radial carcass, and a tread disposed radially outward of the belt The tread includes at least a plurality of circumferential grooves extending in the circumferential direction or substantially in the circumferential direction, and a plurality of grooves extending in the direction inclined with respect to the circumferential direction and opening in the adjacent circumferential grooves. An inclined groove is provided, and the inclined groove has a steeply inclined groove region linearly extending in a direction inclined at an angle of 5 to 30 degrees with respect to the circumferential direction, and an angle of 35 to 70 degrees with respect to the circumferential direction. In a pneumatic tire formed by a gently inclined groove region that extends linearly in an inclined direction, and a connecting region that connects the steeply inclined groove region and the gently inclined groove region while continuously changing the inclination angle, (1) In the steeply inclined groove region, the inclined groove is raised so that the groove depth is 20 to 60% of the groove depth of the circumferential groove. (2) At least in the gently inclined groove region, Pneumatic vehicle or light truck running on rough roads characterized in that at least one groove sidewall angle of the inclined groove is 30 to 60 degrees on the radially outer side and 0 to 20 degrees on the radially inner side. Radial tire. 該傾斜溝は、該緩傾斜溝領域では、溝深さが該周方向溝の溝深さの７０乃至９５％となるように溝の底上げが施されてい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。2. The inclined groove is raised at the bottom so that the groove depth is 70 to 95% of the groove depth of the circumferential groove in the gently inclined groove region. Pneumatic radial tires for passenger cars and light trucks. 該緩傾斜溝領域から該連結領域を経て該急傾斜溝領域にかけて、該傾斜溝の少なくとも一方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であることを特徴とする請求項１又は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。From the gently inclined groove region to the steeply inclined groove region through the connecting region, the groove side wall angle of at least one of the inclined grooves is 30 to 60 degrees on the radially outer side and 0 to 20 degrees on the radially inner side. The pneumatic radial tire for a passenger car or a light truck according to claim 1 or 2. 該緩傾斜溝領域の少なくとも一部では、該傾斜溝の両方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であることを特徴とする請求項１〜３のいずれか１項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 groove side wall angle of both of the inclined grooves is 30 to 60 degrees on the radially outer side and 0 to 20 degrees on the radially inner side in at least a part of the gently inclined groove region. A pneumatic radial tire for a passenger car or a light truck according to any one of the above. トレッドが、トレッド幅の３０％程度を占めるトレッド中央領域と該トレッド中央領域の両側に配置された左右１対のトレッド両側領域とで形成され、該周方向溝はトレッド中央領域に設けられた１乃至２本の中央周方向溝とトレッド両側領域に設けられた左右各１本の両側周方向溝とよりなり、該傾斜溝は該央周方向溝と該央周方向溝に隣接する該両側周方向溝とに開口していることを特徴とする請求項１〜４のいずれか１項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。A tread is formed by a tread central region that occupies about 30% of the tread width and a pair of left and right tread side regions disposed on both sides of the tread central region, and the circumferential groove is provided in the tread central region Or two central circumferential grooves and one left and right circumferential grooves provided in both sides of the tread, and the inclined grooves are adjacent to the central circumferential grooves and the central circumferential grooves. The pneumatic radial tire for a passenger car or a light truck according to any one of claims 1 to 4, wherein the pneumatic radial tire is for a passenger car or a light truck. 該緩傾斜溝領域のうち該傾斜溝が該両側周方向溝に開口する個所では、該緩傾斜溝領域から該急傾斜溝領域にかけてまたは該緩傾斜溝領域から該連結領域をまたいで該急傾斜溝領域にかけて、該傾斜溝の少なくとも一方の溝側壁角度がラジアル方向外側では３０乃至６０度でラジアル方向内側では０乃至２０度であることを特徴とする請求項５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。In the portion of the gently inclined groove region where the inclined groove opens into the circumferential grooves on both sides, the steeply inclined portion extends from the gently inclined groove region to the steeply inclined groove region or across the connecting region from the gently inclined groove region. 6. The passenger car or light truck according to claim 5, wherein a groove side wall angle of at least one of the inclined grooves is 30 to 60 degrees on the radially outer side and 0 to 20 degrees on the radially inner side over the groove region. Pneumatic radial tire.
JP00196498A 1998-01-08 1998-01-08 Pneumatic radial tires for passenger cars or light trucks traveling on rough roads Expired - Fee Related JP3914625B2 (en)

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