JP5156270B2 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

Info

Publication number
JP5156270B2
JP5156270B2 JP2007149226A JP2007149226A JP5156270B2 JP 5156270 B2 JP5156270 B2 JP 5156270B2 JP 2007149226 A JP2007149226 A JP 2007149226A JP 2007149226 A JP2007149226 A JP 2007149226A JP 5156270 B2 JP5156270 B2 JP 5156270B2
Authority
JP
Japan
Prior art keywords
groove
tire
uneven wear
pneumatic tire
width direction
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.)
Expired - Fee Related
Application number
JP2007149226A
Other languages
Japanese (ja)
Other versions
JP2008302730A (en
Inventor
香緒理 成瀬
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 JP2007149226A priority Critical patent/JP5156270B2/en
Publication of JP2008302730A publication Critical patent/JP2008302730A/en
Application granted granted Critical
Publication of JP5156270B2 publication Critical patent/JP5156270B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Tires In General (AREA)

Description

この発明は、タイヤ周方向に延びる主溝内に、トレッド部の偏摩耗を抑制するための偏摩耗犠牲突起を具える空気入りタイヤに関し、特に排水性の向上を図る。   The present invention relates to a pneumatic tire having a partial wear sacrificial projection for suppressing uneven wear of a tread portion in a main groove extending in the tire circumferential direction, and particularly improves drainage.

一般に空気入りタイヤは、比較的径の小さいトレッド部のショルダー側が比較的径の大きいトレッド部のセンター側に引きずられて、進行方向と逆向き(ブレーキング方向)の力を受けることからショルダー側がセンター側に比べて早く摩耗し、いわゆる両減り摩耗(偏摩耗)が生じる。特に、トレッド部にブロックパターンを具えた重荷重用のタイヤにおいては、溝が深く、しかも高重量下で使用されることから、個々のブロックが変形し易すく、それゆえ上記偏摩耗に加えて、各ブロックにおいてタイヤ周方向の前後で蹴り出し側ほど多く摩耗するヒールアンドトウ摩耗(偏摩耗)も生じる。   In general, a pneumatic tire has a shoulder on the shoulder side because the shoulder side of the tread portion having a relatively small diameter is dragged toward the center side of the tread portion having a relatively large diameter and receives a force in the direction opposite to the traveling direction (braking direction). It wears faster than the side, and so-called double wear (uneven wear) occurs. In particular, in heavy-duty tires having a block pattern in the tread portion, since the grooves are deep and used under high weight, individual blocks are easily deformed. Therefore, in addition to the uneven wear, In each block, heel and toe wear (partial wear) that wears more toward the kicking side before and after in the tire circumferential direction also occurs.

従来、このような問題を解決すべく、図5に示すように、トレッド部101にタイヤ周方向に延びる複数の主溝が形成されたタイヤにおいて、タイヤ幅方向最外側の主溝105内に、隣接するリブ113、114に対して低くなるように段差をつけた狭幅のリブ117(偏摩耗犠牲突起)を設けて、その突起117にブレーキング方向の力を集中させて偏摩耗を抑制する空気入りタイヤが提案されている(特許文献1参照)。
特開2007−91197号公報
Conventionally, in order to solve such a problem, as shown in FIG. 5, in a tire in which a plurality of main grooves extending in the tire circumferential direction is formed in the tread portion 101, in the main groove 105 on the outermost side in the tire width direction, A narrow rib 117 (uneven sacrificial protrusion) with a step so as to be lower than the adjacent ribs 113 and 114 is provided, and the force in the braking direction is concentrated on the protrusion 117 to suppress uneven wear. A pneumatic tire has been proposed (see Patent Document 1).
JP 2007-91197 A

しかしながら、特許文献1に記載されたような接地時に路面と接触する偏摩耗犠牲突起を主溝内に有する従来の空気入りタイヤは、その突起117によって主溝105内の空間がタイヤ幅方向の内側および外側の2つの空間105a、105bに隔てられることから、ウェット走行時には、その突起117が、主溝105a内に進入した水の排水を妨げる結果となり排水性が悪化するという問題がある。   However, in the conventional pneumatic tire described in Patent Document 1 that has uneven wear sacrificial protrusions in the main groove that come into contact with the road surface at the time of ground contact, the space in the main groove 105 is inside the tire width direction by the protrusion 117. In addition, since the two spaces 105a and 105b are separated from each other, the projection 117 has a problem that the drainage performance is deteriorated because the projection 117 prevents the water entering the main groove 105a from being drained.

従って、この発明は、これらの問題点を解決することを課題とするものであり、その目的は、高い排水性能を確保しつつ、偏摩耗を抑制することのできる空気入りタイヤを提供することにある。   Therefore, this invention makes it a subject to solve these problems, The objective is to provide the pneumatic tire which can suppress uneven wear, ensuring high drainage performance. is there.

前記の目的を達成するため、この発明は、トレッド部に、タイヤ周方向に延びる複数本の主溝と、少なくともタイヤ幅方向最外側の前記主溝とトレッド端とに挟まれた陸部を複数のブロックに区画する、タイヤ幅方向に延びるラグ溝と、タイヤ幅方向最外側の前記主溝の底部からタイヤ径方向外側に向かって***するとともに当該主溝に沿って連続して延び、当該主溝内をタイヤ幅方向の内側および外側の2つの空間に隔てる偏摩耗犠牲突起とを具え、前記偏摩耗犠牲突起は、未接地時には、トレッド表面よりタイヤ径方向内側に位置し、接地時には、路面とすべり接触する接触面を有する空気入りタイヤにおいて、前記偏摩耗犠牲突起は、前記接触面を形成する第1の高さと、前記第1の高さよりも小さく、かつ、当該偏摩耗犠牲突起のタイヤ幅方向の内側および外側の前記2つの空間を連通する連通部を形成する第2の高さと、を有してなることを特徴とする空気入りタイヤである。かかる構成を採用することにより、主溝内に配設された偏摩耗犠牲突起の接触面は、未接地時には、トレッド表面に対してタイヤ径方向内側に位置し、接地時にはその周囲よりも転がり半径が小さいことから路面とすべり接触する。これにより、偏摩耗犠牲突起を設けないときに主溝のタイヤ幅方向に隣接するブロックに発生していたブレーキング方向の力を、この偏摩耗犠牲突起に吸収させることができるので、その主溝に隣接するブロックに発生するブレーキング方向の力が緩和され偏摩耗は抑制される。さらに、ウェット走行時には、偏摩耗犠牲突起によってタイヤ幅方向の内側および外側の2つの空間に隔たれた主溝内、特には、そのタイヤ幅方向内側の空間に取り込まれた水は、それら2つの空間を連通する連通部を介してラグ溝内へ排出されるので、排水性能は向上する。

In order to achieve the above object, the present invention provides a tread portion including a plurality of main grooves extending in the tire circumferential direction and a plurality of land portions sandwiched between at least the outermost main grooves and the tread ends in the tire width direction. A lug groove extending in the tire width direction and protruding from the bottom of the main groove on the outermost side in the tire width direction toward the outer side in the tire radial direction and continuously extending along the main groove. A partial wear sacrificial protrusion that separates the inside of the groove into two spaces inside and outside in the tire width direction, and the uneven wear sacrificial protrusion is located on the inner side in the tire radial direction from the tread surface when not grounded, and on the road surface when grounded a pneumatic tire having a contact surface for the sliding contact, the uneven wear sacrificial protrusion, first the height you forms the contact surface, the first smaller than the height, and of the uneven wear sacrificial protrusion T A second height that forms a communication portion for communicating the two spaces of the inner and outer Ya width direction, a pneumatic tire characterized by comprising a. By adopting such a configuration, the contact surface of the uneven wear sacrificial protrusion disposed in the main groove is located on the inner side in the tire radial direction with respect to the tread surface when not grounded, and the rolling radius is larger than the surrounding area when grounded. Since it is small, it makes sliding contact with the road surface. As a result, the braking force in the braking direction generated in the block adjacent to the main groove in the tire width direction when the uneven wear sacrifice protrusion is not provided can be absorbed by the uneven wear sacrifice protrusion. The force in the braking direction generated in the block adjacent to is alleviated and uneven wear is suppressed. Furthermore, during wet running, the water taken into the main groove separated by the uneven wear sacrificial protrusions into the two inner and outer spaces in the tire width direction, in particular, the inner space in the tire width direction, Since it is discharged into the lug groove through the communicating part that communicates with the slag, drainage performance is improved.

なお、ここでいう「主溝」には、タイヤ周方向に沿って直線状に延びる溝のみならず、例えば波状又はジグザグ状に屈曲しつつ全体としてタイヤ周方向に延びる、いわゆる屈曲溝をも含むものとする。また、偏摩耗犠牲突起の「高さ」とは、偏摩耗犠牲突起が配設された主溝の底部から偏摩耗犠牲突起の頂端までのタイヤ径方向の距離を意味する。   The “main groove” herein includes not only a groove extending linearly along the tire circumferential direction but also a so-called bent groove extending in the tire circumferential direction as a whole while bending in a wavy or zigzag manner, for example. Shall be. Further, the “height” of the uneven wear sacrificial projection means the distance in the tire radial direction from the bottom of the main groove where the uneven wear sacrificial projection is disposed to the top end of the uneven wear sacrificial projection.

また、連通部は、ラグ溝の延長線上に位置することが好ましい。なお、ここでいう連通部が「外側ラグ溝の延長線上に位置する」とは、ラグ溝の、タイヤ幅方向最外側の主溝へ開口する開口部と、連通部の、タイヤ幅方向最外側の主溝内のタイヤ幅方向外側の空間へ開口する開口部とをそれぞれタイヤ赤道面に投影してみたときに、それらの投影がタイヤ周方向において完全に一致する場合および何れか一方の投影に他方の投影が完全に含まれる場合のみならず、それらの投影がタイヤ周方向において部分的に一致する場合をも含むものとする。   Moreover, it is preferable that a communicating part is located on the extension line of a lug groove. Note that the communication part here is “located on the extended line of the outer lug groove” means that the opening part of the lug groove that opens to the outermost main groove in the tire width direction and the outermost part in the tire width direction of the communication part When projecting the opening that opens to the outer space in the tire width direction in the main groove on the tire equatorial plane, the projections completely coincide with each other in the tire circumferential direction. This includes not only the case where the other projection is completely included, but also the case where these projections partially coincide with each other in the tire circumferential direction.

さらに、ラグ溝の溝深さは、タイヤ幅方向最外側の主溝の溝深さの15〜35%の範囲内にあることが好ましい。   Further, the groove depth of the lug groove is preferably in the range of 15 to 35% of the groove depth of the outermost main groove in the tire width direction.

さらに、連通部の深さは、ラグ溝の溝深さの100〜120%の範囲内にあることが好ましい。なお、ここでいう「連通部の深さ」とは、タイヤ径方向における偏摩耗犠牲突起の第1の高さと第2の高さの差を指す。   Furthermore, it is preferable that the depth of the communication portion is in the range of 100 to 120% of the groove depth of the lug groove. Note that the “depth of the communication portion” referred to here indicates a difference between the first height and the second height of the uneven wear sacrifice protrusion in the tire radial direction.

さらに、ラグ溝の溝幅は、ブロックのタイヤ周方向長さの15〜30%の範囲内にあることが好ましい。   Furthermore, the groove width of the lug groove is preferably in the range of 15 to 30% of the length in the tire circumferential direction of the block.

さらに、連通部のタイヤ周方向の長さは、ラグ溝の溝幅の100〜120%の範囲内にあることが好ましい。なお、ここでいう「連通部のタイヤ周方向の長さ」とは、連通部を形成する偏摩耗犠牲突起の第2の高さが、タイヤ周方向に連続して存在する長さを指す。   Furthermore, it is preferable that the length of the communication portion in the tire circumferential direction is in the range of 100 to 120% of the groove width of the lug groove. The “length of the communicating portion in the tire circumferential direction” herein refers to a length in which the second height of the uneven wear sacrificial protrusions forming the communicating portion exists continuously in the tire circumferential direction.

加えて、未接地時のトレッド表面から偏摩耗犠牲突起の接触面までのタイヤ径方向の距離は、1.5〜3.5mmの範囲内にあることが好ましい。   In addition, the distance in the tire radial direction from the tread surface when not grounded to the contact surface of the uneven wear sacrificial protrusion is preferably in the range of 1.5 to 3.5 mm.

この発明によれば、偏摩耗犠牲突起によってタイヤ幅方向の内側および外側に隔てられた主溝内の2つの空間を連通する連通部を設けたことから、高い排水性能を確保しつつ、偏摩耗を抑制することのできる。   According to the present invention, since the communication portion that communicates the two spaces in the main groove separated by the uneven wear sacrificial protrusions on the inner side and the outer side in the tire width direction is provided, the high wear performance is ensured, and the uneven wear is ensured. Can be suppressed.

以下、図面を参照しつつ、この発明の実施の形態を説明する。図1は、この発明に従う代表的な空気入りタイヤ(以下「タイヤ」という。)のトレッド部の一部の展開図であり、図2は、図1に示すトレッド部に設けられた、以下で説明するサイド主溝および偏摩耗犠牲突起の断面斜視図であり、図3(a)は、以下で説明する外側ラグ溝のタイヤ周方向断面の断面図であり、図3(b)は、サイド主溝および偏摩耗犠牲突起のタイヤ幅方向断面の断面図であり、図3(c)は、以下で説明する連通部のタイヤ周方向断面の断面図であり、図4は、図1の一部拡大断面図である。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a development view of a part of a tread portion of a typical pneumatic tire (hereinafter referred to as “tire”) according to the present invention, and FIG. 2 is a view provided below in the tread portion shown in FIG. FIG. 3A is a cross-sectional perspective view of the side main groove and the uneven wear sacrificial protrusion described, and FIG. 3A is a cross-sectional view of a cross section in the tire circumferential direction of the outer lug groove described below, and FIG. FIG. 3C is a cross-sectional view of a main groove and a cross section of the sacrificial wear sacrificial protrusion in the tire width direction, FIG. 3C is a cross-sectional view of a cross section in the tire circumferential direction of a communication portion described below, and FIG. FIG.

図1に示すタイヤは、トレッド部1に、タイヤ赤道面の両側において、タイヤ周方向にジグザグ状に連続して延びるそれぞれ一対のセンター主溝3およびサイド主溝5を具える。また、このタイヤは、トレッド部1に、センター主溝3とサイド主溝5を連結する内側ラグ溝7と、それぞれのセンター主溝3から、タイヤ周方向で交互になるように、タイヤ幅方向内側に向けて延びる枝溝9と、タイヤ周方向に隣接する枝溝9の間を連結する連結溝11とを具える。これらセンター主溝3、サイド主溝5、枝溝9および連結溝11によってサイド主溝5のタイヤ幅方向内側に内側ブロック13が区画形成されている。さらにこのタイヤは、トレッド部1に、サイド主溝5とトレッド端とに挟まれた陸部から複数の外側ブロック14を区画形成する、サイド主溝5からタイヤ幅方向外側に延びる外側ラグ溝15をも具える。なお、これら主溝3、5、ラグ溝7、15、枝溝9および連結溝11の配設本数および位置は、タイヤに要求される種々の性能を考慮して適宜変更することができる。   The tire shown in FIG. 1 includes a pair of center main grooves 3 and side main grooves 5 that continuously extend in a zigzag shape in the tire circumferential direction on both sides of the tire equatorial plane. Further, in this tire, the inner lug groove 7 connecting the center main groove 3 and the side main groove 5 to the tread portion 1 and the respective center main grooves 3 are alternately arranged in the tire width direction. A branch groove 9 extending inward and a connection groove 11 connecting the branch grooves 9 adjacent in the tire circumferential direction are provided. The center main groove 3, the side main groove 5, the branch groove 9, and the connecting groove 11 define an inner block 13 inside the side main groove 5 in the tire width direction. Further, this tire has a plurality of outer blocks 14 defined in the tread portion 1 from a land portion sandwiched between the side main groove 5 and the tread end, and an outer lug groove 15 extending outward from the side main groove 5 in the tire width direction. It also has. The number and position of the main grooves 3 and 5, the lug grooves 7 and 15, the branch grooves 9 and the connecting grooves 11 can be appropriately changed in consideration of various performances required for the tire.

加えて、このタイヤは、サイド主溝5内に、当該底部からタイヤ径方向外側に向かって***するとともにその主溝に沿って連続して延び、その主溝5内をタイヤ幅方向内外の2つの空間5a、5bに隔てる偏摩耗犠牲突起17を具え、その偏摩耗犠牲突起17は、未接地時には、トレッド表面23よりタイヤ径方向内側に位置し、接地時には路面とすべり接触する接触面19を有する。   In addition, the tire bulges in the side main groove 5 from the bottom toward the outer side in the tire radial direction and continuously extends along the main groove. The uneven wear sacrificial projections 17 are separated into two spaces 5a and 5b. The uneven wear sacrificial projections 17 are located on the inner side in the tire radial direction from the tread surface 23 when not grounded, and have a contact surface 19 that is in sliding contact with the road surface when grounded. Have.

さらに、図2に示すように、偏摩耗犠牲突起17は、接触面19を形成するの第1の高さhと、第1の高さhよりも小さく、偏摩耗犠牲突起17によって隔てられた2つの空間5a、5bを連通する連通部21を形成する第2の高さhと、を有する。 Further, as shown in FIG. 2, the uneven wear sacrificial protrusion 17 is smaller than the first height h 1 forming the contact surface 19 and the first height h 1, and is separated by the uneven wear sacrificial protrusion 17. It was having two spaces 5a, the second height h 2 to form the communicating portion 21 for communicating 5b, the.

かかる実施形態のタイヤによれば、サイド主溝5内に配設された偏摩耗犠牲突起17の接触面19は、未接地時には、トレッド表面23に対してタイヤ径方向内側に位置し、接地時にはその周囲よりも転がり半径が小さいことから路面とすべり接触する。これにより、偏摩耗犠牲突起17を設けないときにサイド主溝5に隣接するブロック13、14に発生していたブレーキング方向の力を、この偏摩耗犠牲突起17に吸収させることができるので、その分サイド主溝5に隣接するブロック13、14に発生するブレーキング方向の力が緩和され偏摩耗は抑制される。   According to the tire of this embodiment, the contact surface 19 of the uneven wear sacrificial projection 17 disposed in the side main groove 5 is located on the inner side in the tire radial direction with respect to the tread surface 23 when not grounded, and when grounded. Since the rolling radius is smaller than the surrounding area, it is in sliding contact with the road surface. As a result, the force in the braking direction generated in the blocks 13 and 14 adjacent to the side main groove 5 when the uneven wear sacrifice protrusion 17 is not provided can be absorbed by the uneven wear sacrifice protrusion 17. Accordingly, the force in the braking direction generated in the blocks 13 and 14 adjacent to the side main groove 5 is alleviated and uneven wear is suppressed.

しかもこの実施形態のタイヤによれば、図1に示すように、ウェット走行時に、トレッド部1の中心付近から連結溝11、枝溝9および内側ラグ溝7を介して流れ出てきた水は、偏摩耗犠牲突起17によってタイヤ幅方向内外の2つの空間に隔たれたサイド主溝5内、特にはそのタイヤ幅方向内側に位置する空間5aに取り込まれるものの、それら両空間5aおよび5bを連通する連通部21を通って外側ラグ溝15内へ排出され得るので、排水性能が低下することがない。   Moreover, according to the tire of this embodiment, as shown in FIG. 1, during wet running, the water flowing out from the vicinity of the center of the tread portion 1 through the connecting groove 11, the branch groove 9 and the inner lug groove 7 is unevenly distributed. Although it is taken into the side main groove 5 separated by the wear sacrificial protrusion 17 into two spaces inside and outside in the tire width direction, particularly in the space 5a located inside the tire width direction, the communicating portion communicates both the spaces 5a and 5b. 21 can be discharged into the outer lug groove 15, so that the drainage performance does not deteriorate.

なお、ウェット走行時に、サイド主溝5内、特には前記空間5a内に取り込まれた水をより効果的に外側ラグ溝15内に排出するためには、連通部21は、外側ラグ溝15の延長線上に位置することが好ましい。   In order to discharge the water taken into the side main groove 5, particularly the space 5 a more effectively into the outer lug groove 15 during wet running, the communication portion 21 is formed on the outer lug groove 15. It is preferable to lie on the extension line.

また、図3(a)、(b)に示すように、外側ラグ溝15の溝深さDlugは、サイド主溝5の溝深さDsideの15〜35%の範囲内にあることが好ましい。外側ラグ溝15の溝深さDlugがサイド主溝5の溝深さDsideの15%未満であると排水性の効果が十分でなく、35%を超えると外側ラグ溝15によって区画された外側ブロック14の剛性が低下し、偏摩耗が発生し易くなってしまうからである。 Further, as shown in FIGS. 3A and 3B, the groove depth D lug of the outer lug groove 15 may be within a range of 15 to 35% of the groove depth D side of the side main groove 5. preferable. If the groove depth D lug of the outer lug groove 15 is less than 15% of the groove depth D side of the side main groove 5, the drainage effect is not sufficient, and if it exceeds 35%, the outer lug groove 15 is partitioned by the outer lug groove 15. This is because the rigidity of the outer block 14 is reduced, and uneven wear tends to occur.

さらに、図3(a)、(c)に示すように、連通部21の深さDpathは、外側ラグ溝15の溝深さDlugの100〜120%の範囲内にあることが好ましい。連通部21の深さDpathが外側ラグ溝15の溝深さDlugの100%未満であると、連通部21を通って外側ラグ溝15へ排出される水の流れが妨げられてしまう結果となるので排出性の効果が十分でなく、120%を超えると偏摩耗犠牲突起17の剛性が過度に低下し耐偏摩耗性の効果が十分でないからである。 Further, as shown in FIGS. 3A and 3C, the depth D path of the communication portion 21 is preferably in the range of 100 to 120% of the groove depth D lug of the outer lug groove 15. If the depth D path of the communication part 21 is less than 100% of the groove depth D lug of the outer lug groove 15, the flow of water discharged to the outer lug groove 15 through the communication part 21 is hindered. Therefore, the effect of discharging is not sufficient, and if it exceeds 120%, the rigidity of the uneven wear sacrificial projection 17 is excessively lowered and the effect of uneven wear resistance is not sufficient.

図4に示すように、外側ラグ溝15の溝幅Wlugは、外側ラグ溝15に隣接する外側ブロック14のタイヤ周方向長さLblockの15〜30%の範囲内にあることが好ましい。外側ラグ溝15の溝幅Wlugが外側ラグ溝15に隣接する外側ブロック14のタイヤ周方向長さLblockの15%未満であると排水性の効果が十分でなく、30%を超えると当該ブロックの剛性が低下し、偏摩耗が発生し易くなってしまうからである。 As shown in FIG. 4, the groove width W lug of the outer lug groove 15 is preferably in the range of 15 to 30% of the tire circumferential direction length L block of the outer block 14 adjacent to the outer lug groove 15. If the groove width W lug of the outer lug groove 15 is less than 15% of the tire circumferential direction length L block of the outer block 14 adjacent to the outer lug groove 15, the drainage effect is not sufficient. This is because the rigidity of the block is lowered and uneven wear is likely to occur.

さらに、図4に示すように、連通部21のタイヤ周方向の長さLpathは、外側ラグ溝15の溝幅Wlugの100〜120%の範囲内にあることが好ましい。連通部21のタイヤ周方向の長さLpathが、外側ラグ溝15の溝幅Wlugの100%未満であると、連通部21を通って外側ラグ溝15へ排出される水の流れが妨げられてしまう結果となるので排出性の効果が十分でなく、120%を超えると接地時に路面とすべり接触する偏摩耗犠牲突起17の接触面19の接触面積が減少し、耐偏摩耗性の効果が十分でないからである。 Furthermore, as shown in FIG. 4, the length L path of the communication portion 21 in the tire circumferential direction is preferably in the range of 100 to 120% of the groove width W lug of the outer lug groove 15. When the length L path in the tire circumferential direction of the communication portion 21 is less than 100% of the groove width W lug of the outer lug groove 15, the flow of water discharged to the outer lug groove 15 through the communication portion 21 is hindered. As a result, the drainage effect is not sufficient, and if it exceeds 120%, the contact area of the contact surface 19 of the uneven wear sacrificial protrusion 17 that is in sliding contact with the road surface at the time of ground contact decreases, and the effect of uneven wear resistance is achieved. Is not enough.

しかも、図3(b)に示すように、未接地時のトレッド表面23から偏摩耗犠牲突起17の接触面19までのタイヤ径方向の距離Hは、1.5〜3.5mmの範囲内にあることが好ましい。未接地時のトレッド表面23から偏摩耗犠牲突起17の接触面19までのタイヤ径方向の距離Hが1.5mm未満であると、接地時に偏摩耗犠牲突起17の接触面19と路面がすべり接触でなく完全に接触してしまい、耐偏摩耗性の効果が十分でなく、3.5mmを超えると偏摩耗犠牲突起17の接触面19と路面が接触しない恐れがあるからである。   Moreover, as shown in FIG. 3B, the distance H in the tire radial direction from the tread surface 23 to the contact surface 19 of the uneven wear sacrificial protrusion 17 when not grounded is in the range of 1.5 to 3.5 mm. Preferably there is. If the distance H in the tire radial direction from the tread surface 23 to the contact surface 19 of the uneven wear sacrificial protrusion 17 when not grounded is less than 1.5 mm, the contact surface 19 of the uneven wear sacrificial protrusion 17 and the road surface are in sliding contact at the time of ground contact. This is because the contact surface 19 of the uneven wear sacrificial projection 17 and the road surface may not be in contact with each other if the contact with the contact surface is more than 3.5 mm.

上述したところは、この発明の実施形態の一部を示したにすぎず、この発明の趣旨を逸脱しない限り、これらの構成を相互に組み合わせたり、種々の変更を加えたりすることができる。   The above description shows only some of the embodiments of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the spirit of the present invention.

次に、この発明に従うタイヤを試作し、性能評価を行ったので、以下に説明する。   Next, tires according to the present invention were prototyped and performance evaluations were performed, which will be described below.

実施例1、2および3のタイヤは、トレッド部に図1に示すトレッドパターンを有するタイヤサイズが11R22.5のトラックおよびバス用のラジアルタイヤであり、表1に示す諸元を有する。なお、いずれのタイヤにおいても偏摩耗犠牲突起によって隔てられた主溝内のタイヤ幅方向の内側および外側の2つの空間を連通する連通部は、外側ラグ溝の延長線上に位置するものである。   The tires of Examples 1, 2 and 3 are radial tires for trucks and buses having a tire size of 11R22.5 having the tread pattern shown in FIG. 1 in the tread portion, and have the specifications shown in Table 1. In any of the tires, the communicating portion that communicates the two inner and outer spaces in the tire width direction in the main groove separated by the uneven wear sacrificial protrusions is located on the extended line of the outer lug groove.

比較のため、トレッド部に、図5に示すトレッドパターンを有する、連通部を設けていない以外は実施例1〜3と同じである従来例1のタイヤについても併せて試作した。従来例1のタイヤは、表1に示す諸元を有する。   For comparison, a tire of Conventional Example 1 having the tread pattern shown in FIG. 5 in the tread part and having the communication part other than that provided in Example 1 to Example 3 was also prototyped. The tire of Conventional Example 1 has the specifications shown in Table 1.

(耐偏摩耗性の評価試験)
前記各供試タイヤを、サイズ7.50×22.5のリムに組み付けて、内圧900kPa(相対圧)として車両(前1軸・後2軸、後2軸駆動。20t車)に装着し、高速道路を主体に5万km走行させた。走行後のタイヤを目視点検し、ブロックに発生した偏摩耗の容積を測定し、この測定値により評価を行い、従来例1の偏摩耗量を100とし各実施例1〜3のタイヤについて指数で表した。その結果を表1に示す。なお、表1中の偏摩耗量の指数の数値が小さいほど偏摩耗が少なく、耐偏摩耗性がよいことを示す。
(Evaluation test for uneven wear resistance)
Each of the test tires is assembled to a rim of size 7.50 × 22.5, and is mounted on a vehicle (front 1 axis / rear 2 axis, rear 2 axis drive, 20t car) with an internal pressure of 900 kPa (relative pressure), I drove 50,000km mainly on the highway. The tire after running is visually inspected, the volume of uneven wear generated in the block is measured, and evaluation is performed based on this measured value. The uneven wear amount of Conventional Example 1 is set to 100 and the tires of Examples 1 to 3 are indexed. expressed. The results are shown in Table 1. In addition, the smaller the numerical value of the index of the amount of uneven wear in Table 1, the smaller the uneven wear and the better the uneven wear resistance.

(ウェット走行性能の評価試験)
前記各供試タイヤを、サイズ7.50×22.5のリムに組み付けて、内圧900kPa(相対圧)として車両(前1軸・後2軸、後2軸駆動。20t車)に装着し、定積状態にて、厚さ2mmの水膜を表面に有する鉄板上で車両を発進させ、そのときの発進加速度をそれぞれ計測した。評価は、実施例1〜3のタイヤにつき従来例1のタイヤの発進加速度を100とし各実施例1〜3のタイヤについて指数で表した。その結果を表1に示す。なお、表1中の発進加速度の指数の数値が大きいほど発進加速度が大きく、すなわち排水性が高いことを示す。
(Evaluation test of wet running performance)
Each of the test tires is assembled to a rim of size 7.50 × 22.5, and is mounted on a vehicle (front 1 axis / rear 2 axis, rear 2 axis drive, 20t car) with an internal pressure of 900 kPa (relative pressure), In a fixed volume state, the vehicle was started on an iron plate having a 2 mm thick water film on the surface, and the starting acceleration at that time was measured. The evaluation was expressed as an index for the tires of Examples 1 to 3 with the starting acceleration of the tire of Conventional Example 1 as 100 for the tires of Examples 1 to 3. The results are shown in Table 1. In addition, it shows that start acceleration is so large that the numerical value of the index of start acceleration in Table 1 is large, ie, drainage is high.

Figure 0005156270
Figure 0005156270

表1に示す結果から、実施例3のタイヤは、実施例1および2のタイヤに比べて連通部の深さおよびタイヤ周方向長さが大きいことから偏摩耗量に若干の増加傾向がみられるが、実施例1および2のタイヤは、従来例1と同じ偏摩耗量であることから、連通部を設けても偏摩耗は抑制可能であることがわかった。   From the results shown in Table 1, the tire of Example 3 has a slightly increasing tendency in the amount of uneven wear because the depth of the communicating portion and the tire circumferential length are larger than those of Examples 1 and 2. However, since the tires of Examples 1 and 2 have the same uneven wear amount as that of Conventional Example 1, it has been found that uneven wear can be suppressed even if a communicating portion is provided.

また、従来例1のタイヤに比べウェット走行時の車両の発進加速度が大きいことから、連通部を設けたことにより排水性が向上したことが確認された。さらに、連通部の深さおよびタイヤ周方向長さが大きいほど、排水性が高くなることも確認された。 Moreover, since the starting acceleration of the vehicle at the time of wet traveling was larger than that of the tire of Conventional Example 1, it was confirmed that the drainage performance was improved by providing the communication portion. Furthermore, it was confirmed that the drainage becomes higher as the depth of the communication portion and the tire circumferential length are larger.

以上の説明から明らかなように、この発明によって、高い排水性能を確保しつつ、偏摩耗を抑制することのできる空気入りタイヤを提供することが可能となった。   As is apparent from the above description, according to the present invention, it is possible to provide a pneumatic tire capable of suppressing uneven wear while ensuring high drainage performance.

この発明に従う代表的な空気入りタイヤのトレッド部の一部の展開図である。1 is a development view of a part of a tread portion of a typical pneumatic tire according to the present invention. 図1に示すトレッド部内のサイド主溝および偏摩耗犠牲突起の断面斜視図である。FIG. 2 is a cross-sectional perspective view of a side main groove and a partial wear sacrifice protrusion in the tread portion shown in FIG. 1. (a)は、外側ラグ溝のタイヤ周方向断面の断面図であり、(b)は、サイド主溝および偏摩耗犠牲突起のタイヤ幅方向断面の断面図であり、(c)は、連通部のタイヤ周方向断面の断面図である。(A) is sectional drawing of the tire circumferential direction cross section of an outer side lug groove, (b) is sectional drawing of the tire width direction cross section of a side main groove and a partial wear sacrificial protrusion, (c) is a communication part. It is sectional drawing of a tire circumferential direction cross section. 図1の一部拡大断面図である。It is a partially expanded sectional view of FIG. 従来技術に従う空気入りタイヤのトレッド部の一部の展開図である。FIG. 3 is a development view of a part of a tread portion of a pneumatic tire according to a conventional technique.

符号の説明Explanation of symbols

1 トレッド部
3 センター主溝
5 サイド主溝
5a 空間
5b 空間
7 内側ラグ溝
9 枝溝
11 連結溝
13 内側ブロック
14 外側ブロック
15 外側ラグ溝
17 偏摩耗犠牲突起
19 接触面
21 連通部
23 トレッド表面
DESCRIPTION OF SYMBOLS 1 Tread part 3 Center main groove 5 Side main groove 5a Space 5b Space 7 Inner lug groove 9 Branch groove 11 Connection groove 13 Inner block 14 Outer block 15 Outer lug groove 17 Uneven wear sacrifice protrusion 19 Contact surface 21 Communication part 23 Tread surface

Claims (7)

トレッド部に、タイヤ周方向に延びる複数本の主溝と、少なくともタイヤ幅方向最外側の前記主溝とトレッド端とに挟まれた陸部を複数のブロックに区画する、タイヤ幅方向に延びるラグ溝と、タイヤ幅方向最外側の前記主溝の底部からタイヤ径方向外側に向かって***するとともに当該主溝に沿って連続して延び、当該主溝内をタイヤ幅方向の内側および外側の2つの空間に隔てる偏摩耗犠牲突起とを具え、前記偏摩耗犠牲突起は、未接地時には、トレッド表面よりタイヤ径方向内側に位置し、接地時には、路面とすべり接触する接触面を有する空気入りタイヤにおいて、
前記偏摩耗犠牲突起は、前記接触面を形成する第1の高さと、前記第1の高さよりも小さく、かつ、当該偏摩耗犠牲突起のタイヤ幅方向の内側および外側の前記2つの空間を連通する連通部を形成する第2の高さと、を有してなることを特徴とする空気入りタイヤ。
A lug extending in the tire width direction that divides a land portion sandwiched between a plurality of main grooves extending in the tire circumferential direction and at least the outermost main groove and the tread end in the tire width direction into a plurality of blocks in the tread portion. The groove and the bottom of the main groove on the outermost side in the tire width direction protrude from the bottom in the tire radial direction and continuously extend along the main groove. One of the uneven wear sacrificial protrusion comprises separating the space, the uneven wear sacrificial protrusion, when ungrounded, located in the tire radial direction inner side than the tread surface, at the time of grounding, a pneumatic tire having a contact surface for sliding contact with the road surface ,
The uneven wear sacrificial protrusion, first the height you forms the contact surface, the first smaller than the height, and the two spaces of the inner and outer tire width direction of the uneven wear sacrificial protrusion A pneumatic tire characterized by having a second height that forms a communicating portion that communicates.
前記連通部は、前記ラグ溝の延長線上に位置する、請求項1に記載の空気入りタイヤ。   The pneumatic tire according to claim 1, wherein the communication portion is located on an extension line of the lug groove. 前記ラグ溝の溝深さは、タイヤ幅方向最外側の前記主溝の溝深さの15〜35%の範囲内にある、請求項1又は2に記載の空気入りタイヤ。   The pneumatic tire according to claim 1 or 2, wherein a groove depth of the lug groove is in a range of 15 to 35% of a groove depth of the main groove on the outermost side in the tire width direction. 前記連通部の深さは、前記ラグ溝の溝深さの100〜120%の範囲内にある、請求項1〜3の何れかに記載の空気入りタイヤ。   The depth of the said communication part is a pneumatic tire in any one of Claims 1-3 which exists in the range of 100 to 120% of the groove depth of the said lug groove. 前記ラグ溝の溝幅は、前記ブロックのタイヤ周方向長さの15〜30%の範囲内にある、請求項1〜4の何れかに記載の空気入りタイヤ。   The pneumatic tire according to any one of claims 1 to 4, wherein a groove width of the lug groove is within a range of 15 to 30% of a length in a tire circumferential direction of the block. 前記連通部のタイヤ周方向の長さは、前記ラグ溝の溝幅の100〜120%の範囲内にある、請求項1〜5の何れかに記載の空気入りタイヤ。   The pneumatic tire according to any one of claims 1 to 5, wherein a length of the communication portion in a tire circumferential direction is in a range of 100 to 120% of a groove width of the lug groove. 未接地時のトレッド表面から前記接触面までのタイヤ径方向の距離は、1.5〜3.5mmの範囲内にある、請求項1〜6のいずれかに記載の空気入りタイヤ。   The pneumatic tire according to any one of claims 1 to 6, wherein a distance in a tire radial direction from the tread surface to the contact surface when not grounded is in a range of 1.5 to 3.5 mm.
JP2007149226A 2007-06-05 2007-06-05 Pneumatic tire Expired - Fee Related JP5156270B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007149226A JP5156270B2 (en) 2007-06-05 2007-06-05 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007149226A JP5156270B2 (en) 2007-06-05 2007-06-05 Pneumatic tire

Publications (2)

Publication Number Publication Date
JP2008302730A JP2008302730A (en) 2008-12-18
JP5156270B2 true JP5156270B2 (en) 2013-03-06

Family

ID=40231830

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007149226A Expired - Fee Related JP5156270B2 (en) 2007-06-05 2007-06-05 Pneumatic tire

Country Status (1)

Country Link
JP (1) JP5156270B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5827669B2 (en) * 2013-12-04 2015-12-02 住友ゴム工業株式会社 Pneumatic tire

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3717617B2 (en) * 1996-02-02 2005-11-16 株式会社ブリヂストン Pneumatic radial tire
JPH09240220A (en) * 1996-03-11 1997-09-16 Bridgestone Corp Pneumatic radial tire for heavy load
JP3332337B2 (en) * 1997-12-17 2002-10-07 住友ゴム工業株式会社 Pneumatic tire
JP2002211210A (en) * 2001-01-12 2002-07-31 Toyo Tire & Rubber Co Ltd Pneumatic tire
JP2005067246A (en) * 2003-08-26 2005-03-17 Sumitomo Rubber Ind Ltd Tire for heavy load
JP4528091B2 (en) * 2004-10-29 2010-08-18 株式会社ブリヂストン Pneumatic tire
JP4729379B2 (en) * 2005-10-03 2011-07-20 株式会社ブリヂストン Pneumatic tire

Also Published As

Publication number Publication date
JP2008302730A (en) 2008-12-18

Similar Documents

Publication Publication Date Title
JP5890853B2 (en) Pneumatic tire
JP4873988B2 (en) Pneumatic tire
JP5657773B1 (en) tire
JPWO2016121858A1 (en) Pneumatic tire
JP6450261B2 (en) Pneumatic tire
JP7092467B2 (en) tire
WO2018225371A1 (en) Pneumatic tire
JP5449209B2 (en) Pneumatic tire
JP6002182B2 (en) Pneumatic tire
JP6607708B2 (en) Pneumatic tire
JP4915066B2 (en) Pneumatic tire
JP6085317B2 (en) Pneumatic tire
JP4909035B2 (en) Pneumatic tire
CN109910522B (en) Pneumatic tire
JP6367139B2 (en) Pneumatic tire
JP6369603B1 (en) Pneumatic tire
JP6369602B1 (en) Pneumatic tire
JP5156270B2 (en) Pneumatic tire
JP6571993B2 (en) Pneumatic tire
JP5436270B2 (en) Heavy duty pneumatic tire
JP6514063B2 (en) Pneumatic tire
JP6631730B1 (en) Pneumatic tire
JP7037350B2 (en) Pneumatic tires
JP4528091B2 (en) Pneumatic tire
JP6612580B2 (en) Pneumatic tire

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100528

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120313

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120321

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120517

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20121113

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20121210

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20151214

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees