JPH11139113A - Pneumatic tire for heavy load - Google Patents

Pneumatic tire for heavy load

Info

Publication number
JPH11139113A
JPH11139113A JP9310130A JP31013097A JPH11139113A JP H11139113 A JPH11139113 A JP H11139113A JP 9310130 A JP9310130 A JP 9310130A JP 31013097 A JP31013097 A JP 31013097A JP H11139113 A JPH11139113 A JP H11139113A
Authority
JP
Japan
Prior art keywords
tire
lug
equator
side wall
wall angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9310130A
Other languages
Japanese (ja)
Inventor
Yasuhiko Kobayashi
靖彦 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP9310130A priority Critical patent/JPH11139113A/en
Publication of JPH11139113A publication Critical patent/JPH11139113A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B60C11/0311—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
    • B60C11/0316—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation further characterised by the groove cross-section
    • 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
    • B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
    • B60C11/1315—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls having variable inclination angles, e.g. warped groove walls

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire for a heavy load provided with point- symmetric lug type patterns for a tread, and excellent in abrasion resistance performance. SOLUTION: In a lug in which a side apart from a tire equatorial line is grounded in advance and a side near to the equatorial line is grounded afterward at the time of rotation (normal rotation) of a tire, a side wall angle αof a treading side is larger than a side wall angle β of a kicking-out side, and the side wall angle α of the treading side is gradually enlarged from the side near to the tire equatorial line EL toward the side apart from the equatorial line EL. In lugs 21, 22 in which sides of near to the equatorial line of the tire are grounded in advance and sides apart from the equatorial line are grounded afterward at the time of rotation of tire (normal rotation), side wall angles βof treading sides are smaller than wall sides angles α of kicking-out sides, and the kicking-out sides angles α are enlarged gradually from the sides near to the equatorial line of the tire toward sides apart from the equatorial line.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は空気入りタイヤに関する
ものであり、特に、ラグ型パターンをトレッドに備え
た、トラック、産業車両および建設車両などに装着され
て使用される重荷重用空気入りタイヤに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire, and more particularly to a heavy-duty pneumatic tire provided with a lug-type pattern on a tread and used in trucks, industrial vehicles, construction vehicles, and the like. Things.

【０００２】[0002]

【従来の技術】一般に、ラグ型パターンをトレッドに備
えた空気入りタイヤは駆動力や制動力が優れ、特に、非
舗装路における牽引力が優れている。そこで、トラッ
ク、産業車両および建設車両などに装着されて使用され
る重荷重用空気入りタイヤで、駆動力や制動力および非
舗装路における牽引力などが強く要求される場合、しば
しば、ラグ型パターンが採用される。2. Description of the Related Art In general, a pneumatic tire provided with a lug-type pattern on a tread has excellent driving force and braking force, and particularly excellent traction force on an unpaved road. Therefore, when heavy-duty pneumatic tires used in trucks, industrial vehicles, and construction vehicles are required to have strong driving, braking, and traction on unpaved roads, lug patterns are often adopted. Is done.

【０００３】トラック用、産業車両用および建設車両用
等の重荷重用空気入りタイヤでは、多くの場合、耐摩耗
性能に優れていることが強く要求される。また、建設車
両用などの重荷重用空気入りタイヤでは、車両に装着す
る際のタイヤの回転（正転）方向を指定することは困難
なことが多いので、点対称なラグ型パターンをトレッド
に備えた空気入りタイヤが要求される。In many cases, pneumatic tires for heavy loads such as for trucks, industrial vehicles, and construction vehicles are required to have excellent wear resistance. Also, with heavy duty pneumatic tires for construction vehicles, etc., it is often difficult to specify the direction of rotation (forward rotation) of the tire when mounted on the vehicle, so a point-symmetric lug pattern is provided on the tread. Pneumatic tires are required.

【０００４】[0004]

【発明が解決しようとする課題】本発明の目的は、点対
称なラグ型パターンをトレッドに備えた、耐摩耗性能に
優れた重荷重用空気入りタイヤを提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a heavy-duty pneumatic tire having a point-symmetric lug pattern on a tread and having excellent wear resistance.

【０００５】[0005]

【課題を解決するための手段】上記の目的を達成するた
めに、本発明によるタイヤは、トレッドの中央領域から
左右いずれか一方の両側領域に向けて、タイヤ回転軸方
向に傾斜した方向に延び、トレッド端で開口する左右い
ずれか一方の横方向溝と、該一方の横方向溝と対をなし
て、トレッドの中央領域から他方の両側領域に向けてタ
イヤ回転軸方向に傾斜した方向に延び、トレッド端で開
口する他方の横方向溝とが周方向に間隔を置いて多数形
成されることによって、左右対をなして一方のラグと他
方のラグとが周方向に間隔を置いて多数形成されたトレ
ッドを備えた空気入りタイヤにおいて、（１）該一方の
横方向溝と該他方の横方向溝とはタイヤの赤道線上の点
に関して点対称であり、（２）該一方のラグまたは該他
方のラグのうち、タイヤの回転（正転）時にタイヤ赤道
線に遠い側が先に接地して赤道線に近い側が後に接地す
るラグにおいて、踏み込み側の側壁角度αが蹴りだし側
の側壁角度βより大きく、かつ、踏み込み側の側壁角度
αがタイヤ赤道線に近い側から赤道線に遠い側に向けて
徐々に大きくなり、（３）該一方のラグまたは該他方の
ラグのうち、タイヤの回転（正転）時にタイヤ赤道線に
近い側が先に接地して赤道線に遠い側が後に接地するラ
グにおいて、踏み込み側の側壁角度βが蹴りだし側の側
壁角度αより小さく、かつ、蹴りだし側の側壁角度αが
タイヤ赤道線に近い側から赤道線に遠い側に向けて徐々
に大きくなることを特徴とする重荷重用空気入りタイヤ
である。本発明によるタイヤでは、該側壁角度α、βが
０度以上３５度以下であること、および該側壁角度がタ
イヤ赤道線に遠い側から赤道線に近い側に向かって連続
的に変化していることが好ましい。本明細書において、
溝またはラグの「側壁角度」とは、トレッドの表面に立
てた法線に対する、溝またはラグの側壁の角度を指す。In order to achieve the above-mentioned object, a tire according to the present invention extends from a central region of a tread toward one of right and left side regions in a direction inclined in a tire rotation axis direction. One of the left and right lateral grooves opening at the tread end, and forming a pair with the one lateral groove, extending in a direction inclined in the tire rotation axis direction from the central region of the tread toward the other side region. The other lateral groove opening at the tread end is formed in large numbers at intervals in the circumferential direction, so that one lug and the other lug are formed in pairs at right and left intervals in the circumferential direction. (1) the one lateral groove and the other lateral groove are point-symmetric with respect to a point on the equatorial line of the tire, and (2) the one lug or the one lug. Of the other lag, In a lug in which the side farther from the tire equator contacts first and the side closer to the equatorial line contacts later during rotation of the ear (forward rotation), the side wall angle α on the stepping side is larger than the side wall angle β on the kicking side and the stepping on. The side wall angle α gradually increases from the side closer to the tire equator line to the side farther from the equator line, and (3) the one lug or the other lug when the tire rotates (forward rotation) In a lug where the side closer to the equator line contacts first and the side farther from the equator line contacts later, the side wall angle β on the stepping side is smaller than the side wall angle α on the kicking side, and the side wall angle α on the kicking side is the tire equator. A heavy-duty pneumatic tire characterized by gradually increasing in size from the side closer to the line to the side farther from the equator line. In the tire according to the present invention, the side wall angles α and β are 0 degrees or more and 35 degrees or less, and the side wall angles continuously change from the side far from the tire equator to the side close to the equator. Is preferred. In this specification,
The “sidewall angle” of a groove or lug refers to the angle of the groove or lug sidewall with respect to the normal to the tread surface.

【０００６】タイヤ回転軸方向に傾斜した方向に延び、
トレッド端で開口する左右１対の横方向溝を備え、一方
の横方向溝と他方の横方向溝とはタイヤの赤道線上の点
に関して点対称であるような本発明によるタイヤでは、
接地転動時に、タイヤ赤道線を挟んで左右いずれか片側
では、ラグがタイヤ赤道線に遠い側が先に接地して赤道
線に近い側が後に接地し、反対側ではラグがタイヤ赤道
線に近い側が先に接地して赤道線に遠い側が後に接地す
る。[0006] It extends in a direction inclined in the tire rotation axis direction,
A tire according to the present invention comprising a pair of left and right lateral grooves opening at the tread edge, one lateral groove and the other lateral groove being point symmetric with respect to a point on the equator line of the tire,
At the time of ground contact rolling, on either one of the left and right sides of the tire equator line, the side where the lug is farther from the tire equatorial line touches first, the side closer to the equatorial line touches later, and on the other side the lug is closer to the tire equatorial line. Ground first and the side farther away from the equator will ground later.

【０００７】タイヤ赤道線に遠い側が先に接地して赤道
線に近い側が後から接地するラグでは、先に接地するタ
イヤ赤道線に遠い側が大きく変形すると、その変形が順
次接地していく赤道線に近い側まで維持されてしまい、
ラグ全体の変形増加を招くことになる。本発明によるタ
イヤは上記のような構成であり、特に、タイヤの回転
（正転）時にタイヤ赤道線に遠い側が先に接地して赤道
線に近い側が後に接地するラグにおいて、踏み込み側の
側壁角度αが蹴りだし側の側壁角度βより大きくなって
いるので、接地開始時の変形を抑制することができ、シ
ョルダー部の周方向せん断力に対する剛性も大きくなる
ので、ラグ全体の変形を効果的に抑制し耐摩耗性能に優
れたタイヤが得られる。本発明によるタイヤは上記のよ
うな構成であり、特に、踏み込み側の側壁角度αがタイ
ヤ赤道線に近い側から赤道線に遠い側に向けて徐々に大
きくなっているが、これは、タイヤ赤道線に近い側では
ラグの変形を抑制する寄与率が小さいので、トレッド・
ゴムの摩耗容積を大きくするためである。In a lug in which the side farther from the tire equator is grounded first and the side closer to the equator is grounded later, if the side farther from the tire equatorial line grounds first deforms greatly, the deformation is sequentially grounded. To the side close to
This will increase the deformation of the entire lug. The tire according to the present invention is configured as described above. In particular, in a lug in which the side farther from the tire equator is grounded first and the side closer to the equator is grounded later when the tire is rotating (forward rotation), Since α is larger than the side wall angle β on the kick-out side, deformation at the start of contact with the ground can be suppressed, and the rigidity of the shoulder against the circumferential shear force increases, effectively deforming the entire lug. It is possible to obtain a tire which is suppressed and has excellent wear resistance. The tire according to the present invention is configured as described above. In particular, the side wall angle α on the stepping side gradually increases from the side close to the tire equator line to the side far from the equator line. On the side close to the line, the contribution to suppress the deformation of the lug is small,
This is to increase the wear volume of the rubber.

【０００８】一方、タイヤ赤道線に近い側が先に接地し
て赤道線に遠い側が後に接地する反対側のラグでは、タ
イヤ赤道線に近い側の剛性が高いので、上記のように変
形が順次接地していく方向に伝わっていくことが少な
い。しかしながら、赤道線に遠い側では径差の関係から
接地面内で制動入力が作用しており、この入力による蹴
り出し時のずれ変位が摩耗の原因となることがある。こ
のずれ変位はタイヤの回転方向と逆方向に作用する。本
発明によるタイヤは上記のような構成であり、特に、タ
イヤの回転（正転）時にタイヤ赤道線に近い側が先に接
地して赤道線に遠い側が後に接地するラグにおいて、踏
み込み側の側壁角度βが蹴りだし側の側壁角度αより小
さくなっているので、蹴りだし側の剛性が高くなり、上
記の蹴り出し時のずれ変位による摩耗を効果的に抑制し
ている。本発明によるタイヤは上記のような構成であ
り、特に、タイヤの回転（正転）時にタイヤ赤道線に近
い側が先に接地して赤道線に遠い側が後に接地するラグ
において、蹴りだし側の側壁角度αがタイヤ赤道線に近
い側から赤道線に遠い側に向けて徐々に大きくなってい
るが、これは、タイヤ赤道線に近い側では上記の蹴り出
し時のずれ変位による摩耗を抑制する寄与率が小さいの
で、トレッド・ゴムの摩耗容積を大きくするためであ
る。On the other hand, in the lug on the opposite side where the side closer to the tire equator is grounded first and the side farther from the equator is later grounded, the rigidity near the tire equator is high, so that the deformation is sequentially grounded as described above. It is less likely to be transmitted in the direction in which it is performed. However, on the side farther from the equator line, a braking input is acting on the ground contact surface due to a difference in diameter, and a displacement caused by this input at the time of kicking out may cause wear. This shift displacement acts in the direction opposite to the tire rotation direction. The tire according to the present invention is configured as described above. In particular, in a lug in which the side closer to the tire equator is grounded first and the side farther from the equator is grounded later when the tire is rotating (forward rotation), Since β is smaller than the side wall angle α on the kicking-out side, the rigidity on the kicking-out side is increased, and the wear due to the displacement at the time of kicking is effectively suppressed. The tire according to the present invention has the above-described configuration. Particularly, in a lug in which the side closer to the tire equator is grounded first and the side farther from the equator is grounded later during rotation (forward rotation) of the tire, the side wall on the kick-out side The angle α gradually increases from the side closer to the tire equator to the side farther from the equator, but this contributes to the suppression of wear due to the displacement during kicking described above on the side closer to the tire equator. This is because the wear rate of the tread rubber is increased because the rate is small.

【０００９】本発明によるタイヤでは、側壁角度α、β
が０度以上３５度以下であることが好ましい。これは、
側壁角度が０度より小さいと、ラグの剛性が著しく低下
し、偏摩耗が発生する恐れがあり、一方、３５度より大
きくなると、ラグの容積が不足するという不具合が生じ
るからである。また、本発明によるタイヤでは、側壁角
度α、βがタイヤ赤道線に遠い側から赤道線に近い側に
向かって連続的に変化していることが好ましい。これ
は、側壁角度の変化がある箇所で連続的でなくなると、
そこで剛性差が生じて偏摩耗が発生する恐れがあるから
である。In the tire according to the present invention, the side wall angles α, β
Is preferably not less than 0 degree and not more than 35 degrees. this is,
If the side wall angle is smaller than 0 degree, the rigidity of the lug is remarkably reduced, and uneven wear may occur. On the other hand, if the side wall angle is larger than 35 degrees, a problem that the volume of the lug is insufficient occurs. In the tire according to the present invention, it is preferable that the side wall angles α and β continuously change from the side far from the tire equator line to the side near the equatorial line. This is because when the side wall angle changes and becomes discontinuous at a certain point,
This is because a difference in rigidity may occur and uneven wear may occur.

【００１０】[0010]

【発明の実施の形態】以下、図面を参照しながら、本発
明に従う実施例の建設車両用空気入りラジアル・タイヤ
および比較例の建設車両用空気入りラジアル・タイヤに
ついて説明する。タイヤ・サイズは、いずれも、１８．
００Ｒ２５である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pneumatic radial tire for a construction vehicle according to an embodiment of the present invention and a pneumatic radial tire for a construction vehicle according to a comparative example will be described below with reference to the drawings. The tire size is 18.
00R25.

【００１１】図１は、本発明に従う実施例の建設車両用
空気入りラジアル・タイヤのトレッド・パターンを示す
正面略図である。図１に示すように、本発明に従う実施
例のタイヤは、トレッドの中央領域から左右いずれか一
方の両側領域に向けてタイヤ回転軸方向に傾斜した方向
に延び、トレッド端ＴＥで開口する左右いずれか一方の
横方向溝１１と、この一方の横方向溝１１と対をなし
て、トレッドの中央領域から他方の両側領域に向けてタ
イヤ回転軸方向に傾斜した方向に延び、トレッド端ＴＥ
で開口する他方の横方向溝１２とが周方向に間隔を置い
て多数形成されることによって、左右対をなして一方の
ラグ２１と他方のラグ２２とが周方向に間隔を置いて多
数形成されたトレッドを備えている。一方の横方向溝１
１と他方の横方向溝１２とはタイヤの赤道線ＥＬ上の点
に関して点対称である。側壁角度αおよびβは図示のａ
−ａ断面ではα1 ＝１９度、β1 ＝１５度で、ｂ−ｂ断
面ではα2 ＝１６度、β2 ＝１４度でｃ−ｃ断面ではα
3 ＝１４度、β3 ＝１２度であり、側壁角度αおよびβ
がタイヤ赤道線ＥＬに遠い側から赤道線ＥＬに近い側に
向かって連続的に変化している。一方のラグ２１または
他方のラグ２２のうち、タイヤの回転（正転）時にタイ
ヤ赤道線ＥＬに遠い側が先に接地して赤道線ＥＬに近い
側が後に接地するラグにおいて、踏み込み側の側壁角度
αが蹴りだし側の側壁角度βより大きく、かつ、踏み込
み側の側壁角度αがタイヤ赤道線ＥＬに近い側から赤道
線ＥＬに遠い側に向けて徐々に大きくなっている。一方
のラグ２１または他方のラグ２２のうち、タイヤの回転
（正転）時にタイヤ赤道線ＥＬに近い側が先に接地して
赤道線ＥＬに遠い側が後に接地するラグにおいて、踏み
込み側の側壁角度βが蹴りだし側の側壁角度αより小さ
く、かつ、蹴りだし側の側壁角度αがタイヤ赤道線ＥＬ
に近い側から赤道線ＥＬに遠い側に向けて徐々に大きく
なっている。FIG. 1 is a schematic front view showing a tread pattern of a pneumatic radial tire for a construction vehicle according to an embodiment of the present invention. As shown in FIG. 1, the tire according to the embodiment of the present invention extends in the direction inclined in the tire rotation axis direction from the central region of the tread toward either one of the right and left regions, and opens at the tread end TE. One of the lateral grooves 11 and one of the lateral grooves 11 form a pair and extend from the center region of the tread toward the other side region in a direction inclined in the tire rotation axis direction, and the tread end TE
A large number of the lugs 21 and the other lugs 22 are formed in a left and right pair at intervals in the circumferential direction by forming a large number of the other lateral grooves 12 that are open at a distance in the circumferential direction. Equipped tread. One lateral groove 1
1 and the other lateral groove 12 are point-symmetric with respect to a point on the equator line EL of the tire. The sidewall angles α and β are a
Α1 = 19 degrees and β1 = 15 degrees in the -a section, α2 = 16 degrees and β2 = 14 degrees in the bb section and α in the cc section
3 = 14 degrees, β3 = 12 degrees, and the side wall angles α and β
Changes continuously from the side far from the tire equator line EL toward the side close to the equator line EL. In one lug 21 or the other lug 22, when the tire rotates (forward rotation), the side farthest from the tire equator line EL contacts the ground first, and the side closer to the equator line EL contacts the ground later. Is larger than the side wall angle β on the kicking side, and the side wall angle α on the stepping side gradually increases from the side closer to the tire equator EL to the side farther from the equator EL. In one lug 21 or the other lug 22, the side closer to the tire equator line EL first contacts the ground when the tire rotates (forward rotation) and the side farther from the equator line EL contacts the rear, and the side wall angle β on the stepping-in side Is smaller than the side wall angle α on the kicking side, and the side wall angle α on the kicking side is the tire equator line EL.
From the side closer to the equator line EL gradually increases.

【００１２】ここで、図２を参照しながら、タイヤの回
転（正転）方向と踏み込み側および蹴りだし側の関係を
説明する。図２（Ａ）に示すように、タイヤの回転（正
転）方向ＲＤが上向きの方向の場合、一方のラグ２１ま
たは他方のラグ２２のうち、タイヤ赤道線ＥＬに遠い側
が先に接地して赤道線ＥＬに近い側が後に接地するラグ
とはラグ２１であり、タイヤ赤道線ＥＬに近い側が先に
接地して赤道線ＥＬに遠い側が後に接地するラグとはラ
グ２２であり、ラグ２１の踏み込み側とは２１Ａを指
し、ラグ２１の蹴りだし側とは２１Ｂを指し、ラグ２２
の踏み込み側とは２２Ａを指し、ラグ２２の蹴りだし側
とは２２Ｂを指す。逆に、図２（Ｂ）に示すように、タ
イヤの回転（正転）方向ＲＤが下向きの方向の場合、一
方のラグ２１または他方のラグ２２のうち、タイヤ赤道
線ＥＬに遠い側が先に接地して赤道線ＥＬに近い側が後
に接地するラグとはラグ２２であり、タイヤ赤道線ＥＬ
に近い側が先に接地して赤道線ＥＬに遠い側が後に接地
するラグとはラグ２１であり、ラグ２２の踏み込み側と
は２２Ｂを指し、ラグ２２の蹴りだし側とは２２Ａを指
し、ラグ２１の踏み込み側とは２１Ｂを指し、ラグ２１
の蹴りだし側とは２１Ａを指す。Here, the relationship between the rotation (forward rotation) direction of the tire and the stepping side and kicking side will be described with reference to FIG. As shown in FIG. 2 (A), when the rotation (forward rotation) direction RD of the tire is an upward direction, the side of one lug 21 or the other lug 22 farther from the tire equator line EL is grounded first. The lug whose side closer to the equator EL is grounded later is the lug 21, the lug closer to the tire equator EL first and grounded farther away from the equator EL is the lug 22, and the lug 21 is depressed. Side refers to 21A, the kicking side of lug 21 refers to 21B, and lug 22
The stepping side of the lug 22A refers to 22A, and the kicking side of the lug 22 refers to 22B. Conversely, as shown in FIG. 2 (B), when the rotation (forward rotation) direction RD of the tire is a downward direction, the side of the one lug 21 or the other lug 22 that is farther from the tire equator line EL comes first. The lug which is in contact with the ground and the side closer to the equator line EL is the lug 22 is the tire equator line EL.
The lug whose first side is grounded first and whose side farther from the equator line EL is grounded is the lug 21, the stepping side of the lug 22 indicates 22B, the kicking side of the lug 22 indicates 22A, and the lug 21 Stepping side refers to 21B, and lug 21
Kicker side means 21A.

【００１３】従来例のタイヤは、側壁角度αおよびβは
ａ−ａ断面ではα1 ＝β1 ＝１６度で、ｂ−ｂ断面では
α2 ＝β2 ＝１４度でｃ−ｃ断面ではα3 ＝β3 ＝１２
度であり、踏み込み側と蹴りだし側の側壁角度が同じで
あることを除いて、上記実施例のタイヤとほぼ同じであ
る。In the conventional tire, the side wall angles α and β are α1 = β1 = 16 degrees in the aa section, α2 = β2 = 14 degrees in the bb section, and α3 = β3 = 12 in the cc section.
Degree, and is almost the same as the tire of the above embodiment except that the side wall angle on the stepping side and the kicking side is the same.

【００１４】上記実施例の建設車両用空気入りラジアル
・タイヤと上記従来例の建設車両用空気入りラジアル・
タイヤについて、室内ドラム試験によって耐摩耗特性の
比較試験を実施した。The pneumatic radial tire for a construction vehicle according to the above embodiment and the pneumatic radial tire for a construction vehicle according to the prior art described above.
For tires, a comparative test of wear resistance was performed by an indoor drum test.

【００１５】比較試験の結果では、上記従来例のタイヤ
と比べ、上記実施例のタイヤは１２％摩耗進展速度が遅
くなっていた。According to the results of the comparative test, the tire of the above example had a 12% reduction in the rate of wear development as compared with the conventional tire.

【００１６】[0016]

【発明の効果】上記比較試験の結果から、本発明によっ
て、耐摩耗特性に優れた空気入りタイヤ得られることが
分かる。From the results of the above comparative tests, it can be seen that the present invention can provide a pneumatic tire having excellent wear resistance.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明のタイヤのトレッド・パターンを示す正
面略図である。FIG. 1 is a schematic front view showing a tread pattern of a tire of the present invention.

【図２】タイヤの回転（正転）方向と踏み込み側および
蹴りだし側の関係を説明する図面である。FIG. 2 is a drawing for explaining the relationship between the rotation (forward rotation) direction of a tire and a stepping side and a kicking side.

【符号の説明】[Explanation of symbols]

１１ 一方の横方向溝 １２ 他方の横方向溝 ２１ 一方のラグ ２２ 他方のラグ ＥＬ タイヤの赤道線 ＲＤ タイヤの回転（正転）方向 ＴＥ トレッド端 11 One lateral groove 12 The other lateral groove 21 One lug 22 The other lug EL Equatorial line of tire RD Tire rotation (forward rotation) direction TE Tread end

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 トレッドの中央領域から左右いずれか一
方の両側領域に向けてタイヤ回転軸方向に傾斜した方向
に延び、トレッド端で開口する左右いずれか一方の横方
向溝と、該一方の横方向溝と対をなして、トレッドの中
央領域から他方の両側領域に向けてタイヤ回転軸方向に
傾斜した方向に延び、トレッド端で開口する他方の横方
向溝とが周方向に間隔を置いて多数形成されることによ
って、左右対をなして一方のラグと他方のラグとが周方
向に間隔を置いて多数形成されたトレッドを備えた空気
入りタイヤにおいて、（１）該一方の横方向溝と該他方
の横方向溝とはタイヤの赤道線上の点に関して点対称で
あり、（２）該一方のラグまたは該他方のラグのうち、
タイヤの回転（正転）時にタイヤ赤道線に遠い側が先に
接地して赤道線に近い側が後に接地するラグにおいて、
踏み込み側の側壁角度αが蹴りだし側の側壁角度βより
大きく、かつ、踏み込み側の側壁角度αがタイヤ赤道線
に近い側から赤道線に遠い側に向けて徐々に大きくな
り、（３）該一方のラグまたは該他方のラグのうち、タ
イヤの回転（正転）時にタイヤ赤道線に近い側が先に接
地して赤道線に遠い側が後に接地するラグにおいて、踏
み込み側の側壁角度βが蹴りだし側の側壁角度αより小
さく、かつ、蹴りだし側の側壁角度αがタイヤ赤道線に
近い側から赤道線に遠い側に向けて徐々に大きくなるこ
とを特徴とする重荷重用空気入りタイヤ。1. A left or right lateral groove extending in a direction inclined in the tire rotation axis direction from a central region of a tread toward one of right and left side regions and opening at a tread end; Paired with the direction groove, extending from the central region of the tread toward the other side region in the direction inclined in the tire rotation axis direction, and the other lateral groove opening at the tread end is spaced circumferentially. In the pneumatic tire provided with a large number of treads, one lug and the other lug are formed in a left-right pair at circumferential intervals with respect to each other. (1) The one lateral groove And the other lateral groove are point-symmetric with respect to a point on the equator line of the tire, and (2) the one lug or the other lug
In a lug where the side farther from the tire equator is grounded first and the side closer to the equator is grounded later when the tire rotates (forward rotation),
The side wall angle α on the stepping side is larger than the side wall angle β on the kicking side, and the side wall angle α on the stepping side gradually increases from the side closer to the tire equator to the side farther from the equator. In one lug or the other lug, when the tire rotates (forward rotation), the side closer to the tire equator is grounded first, and the side farther from the equator is grounded later, and the side wall angle β on the stepping side kicks out. A heavy-duty pneumatic tire characterized in that the side wall angle α is smaller than the side wall angle α and the side wall angle α on the kicking side gradually increases from the side closer to the tire equator line to the side farther from the equator line. 【請求項２】 該側壁角度α、βが０度以上３５度以下
であることを特徴とする請求項１記載の空気入りタイ
ヤ。2. The pneumatic tire according to claim 1, wherein the side wall angles α and β are 0 degrees or more and 35 degrees or less. 【請求項３】 該側壁角度がタイヤ赤道線に遠い側から
赤道線に近い側に向かって連続的に変化していることを
特徴とする請求項１乃至２記載の空気入りタイヤ。3. The pneumatic tire according to claim 1, wherein the side wall angle continuously changes from a side far from the tire equator to a side near the equator.
JP9310130A 1997-11-12 1997-11-12 Pneumatic tire for heavy load Pending JPH11139113A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9310130A JPH11139113A (en) 1997-11-12 1997-11-12 Pneumatic tire for heavy load

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9310130A JPH11139113A (en) 1997-11-12 1997-11-12 Pneumatic tire for heavy load

Publications (1)

Publication Number Publication Date
JPH11139113A true JPH11139113A (en) 1999-05-25

Family

ID=18001538

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9310130A Pending JPH11139113A (en) 1997-11-12 1997-11-12 Pneumatic tire for heavy load

Country Status (1)

Country Link
JP (1) JPH11139113A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001213119A (en) * 2000-02-04 2001-08-07 Bridgestone Corp Pneumatic tire and its designing method
US6705367B1 (en) * 1999-07-29 2004-03-16 Bridgestone Corporation Heavy duty pneumatic radial tire including lug groove having platform
US6761196B2 (en) * 2000-01-26 2004-07-13 Bridgestone Corporation Pneumatic tire having lug grooves
JP2006521236A (en) * 2003-03-25 2006-09-21 ソシエテ ドゥ テクノロジー ミシュラン Method of attaching tire to construction machine and tire
JP2014168989A (en) * 2013-03-01 2014-09-18 Bridgestone Corp Tire
JP2015020442A (en) * 2013-07-16 2015-02-02 東洋ゴム工業株式会社 Pneumatic tire
CN107735270A (en) * 2015-06-15 2018-02-23 株式会社普利司通 Pneumatic tire
EP3686035A1 (en) * 2019-01-25 2020-07-29 Sumitomo Rubber Industries, Ltd. Tire
CN114746288A (en) * 2019-11-29 2022-07-12 株式会社普利司通 Tyre for vehicle wheels

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6705367B1 (en) * 1999-07-29 2004-03-16 Bridgestone Corporation Heavy duty pneumatic radial tire including lug groove having platform
US6761196B2 (en) * 2000-01-26 2004-07-13 Bridgestone Corporation Pneumatic tire having lug grooves
JP2001213119A (en) * 2000-02-04 2001-08-07 Bridgestone Corp Pneumatic tire and its designing method
JP2006521236A (en) * 2003-03-25 2006-09-21 ソシエテ ドゥ テクノロジー ミシュラン Method of attaching tire to construction machine and tire
JP2014168989A (en) * 2013-03-01 2014-09-18 Bridgestone Corp Tire
JP2015020442A (en) * 2013-07-16 2015-02-02 東洋ゴム工業株式会社 Pneumatic tire
CN107735270A (en) * 2015-06-15 2018-02-23 株式会社普利司通 Pneumatic tire
EP3308981A4 (en) * 2015-06-15 2018-05-09 Bridgestone Corporation Pneumatic tire
US10960711B2 (en) 2015-06-15 2021-03-30 Bridgestone Corporation Pneumatic tire
EP3686035A1 (en) * 2019-01-25 2020-07-29 Sumitomo Rubber Industries, Ltd. Tire
CN111483275A (en) * 2019-01-25 2020-08-04 住友橡胶工业株式会社 Tyre for vehicle wheels
US11453243B2 (en) 2019-01-25 2022-09-27 Sumitomo Rubber Industries, Ltd. Tire
CN114746288A (en) * 2019-11-29 2022-07-12 株式会社普利司通 Tyre for vehicle wheels
EP4067118A4 (en) * 2019-11-29 2023-03-15 Bridgestone Corporation Tire
CN114746288B (en) * 2019-11-29 2023-09-08 株式会社普利司通 Tire with a tire body

Similar Documents

Publication Publication Date Title
JP5238050B2 (en) Pneumatic tire
WO2007097309A1 (en) Pneumatic tire
JP3335118B2 (en) Heavy duty tire
JP7187255B2 (en) pneumatic tire
JP5471511B2 (en) Pneumatic tire
JP3035172B2 (en) Radial tire
JPH11139113A (en) Pneumatic tire for heavy load
JPS62103205A (en) Heavy load pneumatic tyre
JP2703172B2 (en) Heavy duty tire
JP2001191738A (en) Off-road pneumatic tire
JP2001121927A (en) Pneumatic tire
JP3104042B2 (en) Pneumatic tire
JP2001219715A (en) Pneumatic tire with high maneuver stability
JP2004075056A (en) Off-the-road tire
US10589575B2 (en) Tire
JP2005125880A (en) Pneumatic tire
JP4290806B2 (en) Pneumatic tire
JP2001039124A (en) Pneumatic tire
JP4468006B2 (en) Pneumatic tire
JP2004009999A (en) Pneumatic tire
JP2588065B2 (en) Pneumatic flat tire
JPH1191313A (en) Pneumatic radial tire
JPH01262204A (en) Pneumatic tire
JP7284037B2 (en) tire
WO2021106919A1 (en) Tire