WO2014122932A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2014122932A1 WO2014122932A1 PCT/JP2014/000639 JP2014000639W WO2014122932A1 WO 2014122932 A1 WO2014122932 A1 WO 2014122932A1 JP 2014000639 W JP2014000639 W JP 2014000639W WO 2014122932 A1 WO2014122932 A1 WO 2014122932A1
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- WO
- WIPO (PCT)
- Prior art keywords
- groove
- tire
- circumferential direction
- lateral
- 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.)
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Classifications
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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
- B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
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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
- B60C11/0302—Tread patterns directional pattern, i.e. with main rolling direction
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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
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- 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
- B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
-
- 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
-
- 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
- B60C11/1259—Depth of the sipe
- B60C11/1263—Depth of the sipe different within the same sipe
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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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
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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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0346—Circumferential grooves with zigzag shape
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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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0351—Shallow grooves, i.e. having a depth of less than 50% of other grooves
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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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0386—Continuous ribs
- B60C2011/0388—Continuous ribs provided at the equatorial plane
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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
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
Definitions
- the present invention relates to a pneumatic tire, and more particularly to a pneumatic tire that can be suitably used as a winter tire.
- Patent Document 1 exhibits excellent performance on snow and on ice on snowy road surfaces and frozen road surfaces, but the drainage performance when running on wet road surfaces is not sufficient.
- an object of the present invention is to provide a pneumatic tire having excellent drainage performance while maintaining on-snow performance and on-ice performance.
- the pneumatic tire of the present invention includes a pair of circumferential grooves extending across the tire equator, and a rib-shaped central land portion row defined by the pair of circumferential grooves and a tread end.
- a pneumatic tire comprising a plurality of lateral grooves extending in the tire width direction, and vertical grooves that are located outside the circumferential grooves in the tire width direction and communicate between the lateral grooves adjacent to each other in the tire circumferential direction.
- the transverse groove includes a transverse groove first portion, a transverse groove second portion located on the outer side in the tire width direction with respect to the transverse groove first portion, and a transverse groove step portion connecting the transverse groove first portion and the transverse groove second portion.
- a groove width center at the outer end in the tire width direction of the first lateral groove is positioned on one side in the tire circumferential direction with respect to a groove width center at the inner end in the tire width direction of the second lateral groove, and the lateral groove step portion Is the outer end of the transverse groove first portion in the tire width direction and the transverse groove second.
- Extending in the tire circumferential direction so as to connect the inner ends of the tires in the tire width direction, and the longitudinal groove extends obliquely to the side opposite to the lateral groove step portion with respect to the tire circumferential direction.
- the end portion of the longitudinal groove on one side in the tire circumferential direction is joined to the joint portion of the lateral groove second portion and the lateral groove step portion of the lateral groove on one side in the tire circumferential direction, and the end of the longitudinal groove on the other side in the tire circumferential direction.
- the portion is joined to the joint portion between the transverse groove first portion of the transverse groove on the other side in the tire circumferential direction and the transverse groove step portion.
- the water entering the groove is efficiently discharged to the outside in the tire width direction while maintaining the performance on snow and the performance on ice, and is wet.
- the drainage performance on the road surface can be improved.
- “extends inclining to the side opposite to the lateral groove step with respect to the tire circumferential direction” means that the groove extending direction is opposite to the lateral groove step with respect to the tire circumferential direction. Inclined in the direction.
- the “groove extending direction” refers to a direction in which the amplitude center line extends when the groove is bent and extended.
- the longitudinal groove connects the longitudinal groove first portion, the longitudinal groove second portion located on one side in the tire circumferential direction of the longitudinal groove first portion, and the longitudinal groove first portion and the longitudinal groove second portion.
- the inclination angle of the longitudinal groove step portion with respect to the tire circumferential direction is preferably larger than the inclination angle of the longitudinal groove first portion and the inclination angle of the longitudinal groove second portion with respect to the tire circumferential direction.
- the depth of the longitudinal groove is preferably shallower than the depth of the circumferential groove.
- the second portion of the lateral groove has a portion extending in a zigzag shape in plan view.
- the zigzag extending portion in the second lateral groove portion it is possible to secure the edge component of the shoulder portion having a high pressure applied during braking and improve the braking performance.
- FIG. 3 is a one-side sectional view in the tire width direction at a position along the line III-III of the pneumatic tire shown in FIG. 1.
- a pneumatic tire 1 is partitioned on a tread surface by a pair of circumferential grooves 2 extending across the tire equator C and a pair of circumferential grooves 2.
- a plurality of lateral grooves 3 extending continuously in the tire width direction between the rib-shaped central land portion row CL and the tread end TE, and the outer side of the circumferential groove 2 in the tire width direction.
- a vertical groove 4 that communicates between adjacent horizontal grooves 3 is provided.
- An intermediate block row ML including a plurality of intermediate blocks defined by the circumferential groove 2, the vertical groove 4, and the horizontal groove 3 is provided on the outer side in the tire width direction of the central land portion row CL.
- an outer block row EL composed of a plurality of outer blocks defined by the vertical grooves 4, the tread ends TE, and the horizontal grooves 3 is provided on the outer side in the tire width direction of the intermediate block row ML.
- a plurality of sipes S are provided in each land portion of the central land portion row CL, the intermediate block row ML, and the outer block row EL.
- the shape of the sipe S is not particularly limited.
- the sipe S may be a so-called three-dimensional sipe or a two-dimensional sipe.
- the extending direction of the sipe S is not particularly limited.
- a plurality of sipes S in the tire width direction may be provided in the central land portion row CL, the intermediate block row ML, and the outer block row EL to increase the edge component in the tire width direction.
- a plurality of sipes S in the tire circumferential direction may be provided to increase the edge component in the tire circumferential direction.
- the pneumatic tire 1 is a tire whose rotation direction is specified using known means, and is attached to the vehicle so as to rotate downward in FIG. 1 during forward rotation (forward movement). Used.
- the pair of circumferential grooves 2 are bent with an amplitude in the tire width direction and extend in the tire circumferential direction.
- the circumferential groove 2 has a zigzag-like shape having a convex bent portion toward the inner side in the tire width direction between two lateral grooves 3 adjacent in the tire circumferential direction. It has a shape.
- each lateral groove 3 extends inclined with respect to the tire width direction.
- the lateral groove 3 extends by bending twice toward the other side B in the tire circumferential direction.
- 3R ′, 3R ′′ are arranged in parallel to the tire circumferential direction at a fixed arrangement pitch.
- the arrangement position of the lateral grooves 3L, 3L ′, 3L ′′ located on one side in the tire width direction and the arrangement position of the lateral grooves 3R, 3R ′, 3R ′′ located on the other side in the tire width direction are the tire There is a half-pitch shift in the circumferential direction.
- Each lateral groove 3 includes a lateral groove first portion 31, a lateral groove second portion 32 located on the outer side in the tire width direction from the lateral groove first portion 31, and a lateral groove step that connects the lateral groove first portion 31 and the lateral groove second portion 32. Part 33.
- the lateral groove first portion 31 extends in a convex curve toward the other side B in the tire circumferential direction.
- corrugation is provided in the tire circumferential direction one side A and the tire circumferential direction other side B of the horizontal groove 1st part 31 in planar view.
- the groove wall on the inner side in the tire width direction on the one side A in the tire circumferential direction and the groove wall on the outer side in the tire width direction on the other side B in the tire circumferential direction are flat. It extends with an unevenness in view.
- the transverse groove second portion 32 extends in a convex curve toward the other side B in the tire circumferential direction, like the transverse groove first portion 31.
- the horizontal groove 2nd part 32 has a part extended in zigzag shape in planar view.
- the groove wall portion on the outer side in the tire width direction extends in an uneven manner in a plan view.
- the inclination angle with respect to the tire width direction of the transverse groove first portion 31 and the transverse groove second portion 32 is gradually reduced toward the tread end side.
- the groove width center line of the lateral groove first portion 31 is defined as l 1
- the groove width center of the lateral groove first portion 31 at the outer end in the tire width direction is defined as X.
- the transverse grooves groove width center line of the second portion 32 and l 2 a groove width center of the lateral groove in the tire width direction inner end of the second portion 32 and Y.
- the groove width center X at the outer end in the tire width direction of the lateral groove first portion 31 is located on one side A in the tire circumferential direction from the groove width center Y at the inner end in the tire width direction of the second lateral groove portion 32.
- the groove width center X is located on the tire circumferential direction one side A and the tire width direction inner side than the groove width center Y of the inner end of the lateral groove second portion 32 in the tire width direction.
- the lateral groove step portion 33 is inclined and linearly extended with respect to the tire circumferential direction so as to connect the outer end in the tire width direction of the first lateral groove portion 31 and the inner end in the tire width direction of the second lateral groove portion 32. .
- the lateral groove step portion 33 extends while being inclined outward in the tire width direction with respect to the tire circumferential direction line.
- the lateral groove step portion 33 extends, for example, at an angle of 20 to 70 ° outward in the tire width direction with respect to the tire circumferential direction line.
- the dimension along the tire width direction of the lateral groove step portion 33 is 20% or less of the dimension along the tire width direction of the lateral groove 3.
- the dimension along the tire width direction of the lateral groove step portion 33 is 5 to 12 mm.
- the vertical groove 4 is bent twice and extends, and is inclined to the side opposite to the horizontal groove step portion 33 with respect to the tire circumferential direction. Specifically, in FIGS. 1 and 2, the longitudinal grooves 4 are inclined and extended inward in the tire width direction with respect to the tire circumferential direction line. For example, the longitudinal groove 4 extends at an angle of 5 to 40 ° inward in the tire width direction with respect to the tire circumferential direction line.
- the end of the longitudinal groove 4 on one side A in the tire circumferential direction is joined to the joint between the lateral groove second portion 32 of the lateral groove 3R on the one side A in the tire circumferential direction and the lateral groove step 33, and the tire circumferential direction of the longitudinal groove 4
- the end portion on the other side B is joined to a joint portion between the transverse groove first portion 31 ′ of the transverse groove 3R ′ on the other side B in the tire circumferential direction and the transverse groove step portion 33 ′.
- the joint portion between the lateral groove first portion 31 and the longitudinal groove 4 adjacent to each other in the tire circumferential direction is disposed on the same tire circumferential direction line.
- the junction part of the horizontal groove 2nd part 32 and the vertical groove 4 which adjoins a tire circumferential direction is arrange
- the longitudinal groove 4 includes a longitudinal groove first portion 41 located on the tire circumferential direction other side B, a longitudinal groove second portion 42 located on the tire circumferential direction one side A, a longitudinal groove first portion 41 and a longitudinal groove second.
- a longitudinal groove step 43 that connects the portion 42 is included.
- the inclination angle of the longitudinal groove step portion 43 with respect to the tire circumferential direction is larger than the inclination angle of the longitudinal groove first portion 41 and the inclination angle of the longitudinal groove second portion 42 with respect to the tire circumferential direction.
- the longitudinal groove step portion 43 is inclined at an angle of 50 to 90 ° inward in the tire width direction with respect to the tire circumferential direction line.
- the dimension along the tire circumferential direction of the longitudinal groove step portion 43 is 40% or less of the dimension along the tire circumferential direction of the longitudinal groove 4.
- the dimension along the tire circumferential direction of the longitudinal groove step portion 43 is 3 to 7 mm.
- the rib-shaped central land portion CL is provided in the center region of the tire tread surface, thereby exhibiting excellent steering stability performance particularly on a dry road surface. And since the sipe S is provided in the central land portion row CL, it is possible to secure the edge component without reducing the rigidity of the land portion as compared with the case where the groove is provided in the central land portion row CL. Can do.
- each lateral groove 3 extends in a convex curve toward the other side B in the tire circumferential direction, and the lateral groove first portion 31 and the lateral groove second portion 32.
- the arrangement pitch of the transverse grooves 3 is constant, but the arrangement position of the transverse grooves 3L located on one side in the tire width direction of the tire equator C and the arrangement position of the transverse grooves 3R located on the other side in the tire width direction are as follows. Deviation in the tire circumferential direction. Therefore, in this pneumatic tire 1, pattern noise at the time of tire rolling can be reduced and noise performance can be improved as compared with a case where the arrangement positions of the lateral grooves 3R, 3L are not shifted.
- the pair of circumferential grooves 2 are bent with an amplitude in the tire width direction, compared to the case where the circumferential grooves extend linearly.
- the edge components in both the tire width direction and the tire circumferential direction can be ensured to ensure steering stability.
- a snow column can be favorably formed in the circumferential groove 2, and the snow column shear force can be improved to further improve the performance on snow.
- the edge component with respect to a tire circumferential direction can be increased, and the turning performance on a snowy road can be improved.
- the lateral groove step portion 33 connects the lateral groove first portion 31 and the lateral groove second portion 32, the edge portion is formed on the outer side in the tire width direction on the tire circumferential direction one side A of the blocks constituting the intermediate land portion row ML. Can be increased. Therefore, the road surface can be scratched by the edge on the outer side in the tire width direction where the ground contact area becomes large during turning, and the turning performance can be improved.
- unevenness is provided in the tire circumferential direction one side A and the tire circumferential direction other side B of the lateral groove first portion 31 in plan view, thereby increasing the edge component of the blocks constituting the intermediate land portion row ML. Further, the effect of scratching the road surface can be obtained by the edge, and a snow column can be well formed in the lateral groove 3, and the snow column shear force can be improved, so that the performance on snow can be further improved.
- the lateral groove second portion 32 has a zigzag shape in a plan view, it is possible to secure an edge component of a shoulder portion having a high pressure applied during braking and improve braking performance.
- the lateral groove 3 includes a lateral groove step portion 33, and the longitudinal groove 4 extends in an inclined direction opposite to the lateral groove step portion 33 with respect to the tire circumferential direction.
- the end on one side A in the direction is joined to the joint between the second portion 32 of the transverse groove 3 on the lateral groove 3 on the one side A in the tire circumferential direction and the step 33 on the lateral groove, and the end on the other side B in the tire circumferential direction 4
- the pneumatic tire 1 is excellent without impairing on-snow performance by being joined to the joining portion of the transverse groove first portion 31 ′ of the transverse groove 3 ′ on the other side B of the tire circumferential direction and the transverse groove step portion 33 ′.
- Drainage performance can be demonstrated. Specifically, when running on a wet road surface, the water that has entered the circumferential groove 2 from one side A in the tire circumferential direction passes through the lateral groove first portion 31 and flows through the longitudinal groove 4a, and the lateral groove first portion 31 and the lateral groove. They merge at the joint with the step 33 and enter the lateral groove step 33.
- the water that has entered the horizontal groove step portion 33 is diverted to the vertical groove 4 b and the horizontal groove second portion 32 at the joint between the horizontal groove step portion 33 and the horizontal groove second portion 32.
- the water that has entered the transverse groove second portion 32 flows to the tread end TE of the tire and is discharged.
- the water that has entered the longitudinal groove 4b passes through the circumferential groove 2 at the junction between the transverse groove first portion 31 ′ and the transverse groove step portion 33 ′ of the transverse groove 3R ′ on the other side B in the circumferential direction. It merges with the water flowing through 31 'and enters the lateral groove step 33'. Then, the water that has entered the lateral groove step portion 33 ′ is diverted to the vertical groove 4 c and the horizontal groove second portion 32 ′ at the joint portion between the horizontal groove step portion 33 ′ and the horizontal groove second portion 32 ′.
- the water that has entered the transverse groove second portion 32 ′ flows to the tire tread end TE and is discharged, and the water that has entered the longitudinal groove 4c further enters the transverse groove 3R ′′.
- inflow and outflow at the merging portion can be kept constant even though the merging portion of the longitudinal groove 4 and the lateral groove 3 exists. Therefore, water can be efficiently drained without impairing performance on snow, and excellent drainage performance can be exhibited.
- the horizontal groove step portion 33 and the vertical groove 4 in the horizontal groove when traveling on a wet road surface can be obtained. Water flow can be made better and drainage performance can be further improved.
- the longitudinal groove 4 includes the longitudinal groove step portion 43 having a larger inclination angle with respect to the tire circumferential direction than the longitudinal groove first portion 41 and the longitudinal groove second portion 42. Edge components are increased, and driving performance can be improved.
- the depth of the vertical groove 4 is shallower than the depth of the circumferential groove 2, thereby configuring the block rigidity on the outer side in the tire width direction, specifically, the intermediate land portion row ML and the outer land portion row EL.
- the rigidity of the block to be performed can be ensured. Accordingly, the block can be prevented from falling on the outer side in the tire width direction and the contact area can be secured, so that the braking performance can be improved and the turning performance can be improved.
- the depth of the vertical groove 4 is made shallower than that of the horizontal groove 3, the water flow in the horizontal groove 3 during running on a wet road surface can be further improved to improve drainage performance.
- the vertical groove 4 is inclined and extended to the opposite side (tire width direction inner side) with respect to the tire circumferential direction line with respect to the tire circumferential direction line, so that the vertical groove 4 extends with respect to the tire circumferential direction line.
- the edge of the end portion on the one side A in the tire circumferential direction of the blocks constituting the outer land portion row EL The angle increases. Therefore, the rigidity of the blocks constituting the outer land portion row EL can be ensured.
- the acute angle portion of the block on the outer side in the tire width direction of the intermediate land portion row ML and one side A in the circumferential direction, and on the inner side in the tire width direction of the outer land portion row EL and the other side B in the circumferential direction. And block rigidity can be ensured.
- the pneumatic tire of this invention is not limited to the said example, A change is suitably added to the pneumatic tire of this invention. be able to.
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Abstract
Description
なお、ここで、縦溝に関し、「タイヤ周方向に対して横溝段部とは反対側に傾斜して延在」するとは、溝延在方向が、タイヤ周方向に対して横溝段部とは反対方向に傾斜していることをいう。なお、「溝延在方向」とは、溝が屈曲して延在している場合には振幅中心線が延びる方向をいう。
図1に示すように、本発明の一例に係る空気入りタイヤ1は、トレッドの踏面に、タイヤ赤道Cを挟んで延びる1対の周方向溝2と、1対の周方向溝2によって区画形成されたリブ状の中央陸部列CLとトレッド端TEとの間でタイヤ幅方向に連続して延びる複数本の横溝3と、周方向溝2のタイヤ幅方向外側に位置し、タイヤ周方向に隣接する横溝3間を連通する縦溝4とが設けられている。
そして、中央陸部列CLのタイヤ幅方向外側には、周方向溝2と、縦溝4と、横溝3とによって区画形成された複数の中間ブロックよりなる中間ブロック列MLが設けられている。また、中間ブロック列MLのタイヤ幅方向外側には、縦溝4と、トレッド端TEと、横溝3とによって区画形成された複数の外側ブロックよりなる外側ブロック列ELが設けられている。
ここで、中央陸部列CL、中間ブロック列ML及び外側ブロック列ELの各陸部には、複数のサイプSが設けられている。なお、サイプSの形状は特に限定されることはなく、例えば、サイプSは、所謂三次元サイプであってもよいし、二次元サイプであってもよい。また、サイプSの延在方向も特に限定されることはない。例えば、図1に示すように、中央陸部列CL、中間ブロック列ML及び外側ブロック列ELに、タイヤ幅方向のサイプSを複数設けて、タイヤ幅方向のエッジ成分を増加させてもよい。或いは、タイヤ周方向のサイプSを複数設けて、タイヤ周方向のエッジ成分を増加させてもよい。このように、サイプSを設けることにより、積雪路上における所望の方向の引っ掻き効果を増加させ、雪上性能を向上させることができる。
なお、この空気入りタイヤ1は、既知の手段を用いて回転方向が指定されたタイヤであり、正転時(前進時)に図1では下側に向かって回転するように車両に取り付けられて用いられる。
横溝段部33のタイヤ幅方向に沿う寸法は、横溝3のタイヤ幅方向に沿う寸法の20%以下である。例えば、横溝段部33のタイヤ幅方向に沿う寸法は、5~12mmである。
縦溝4のタイヤ周方向一方側Aの端部は、タイヤ周方向一方側Aの横溝3Rの横溝第2部分32と横溝段部33との接合部に接合し、縦溝4のタイヤ周方向他方側Bの端部は、タイヤ周方向他方側Bの横溝3R’の横溝第1部分31’と横溝段部33’との接合部に接合している。
また、図1及び2に示すように、タイヤ周方向に隣接する、横溝第1部分31と縦溝4との接合部は、同一のタイヤ周方向線上に配置されている。更に、タイヤ周方向に隣接する、横溝第2部分32と縦溝4との接合部とは、同一のタイヤ周方向線上に配置されている。
更には、図3に示すように、縦溝4の深さは、周方向溝2の深さよりも浅くなっている。また、図示しないが、縦溝4の深さを、横溝3の深さよりも浅くしてもよい。
そして、中央陸部列CLには、サイプSが設けられているので、中央陸部列CLに溝を設ける場合と比較して、陸部の剛性を低下させることなく、エッジ成分を確保することができる。
そして、横溝3の配設ピッチは一定であるが、タイヤ赤道Cのタイヤ幅方向一方側に位置する横溝3Lの配設位置と、タイヤ幅方向他方側に位置する横溝3Rの配設位置とが、タイヤ周方向にずれている。従って、この空気入りタイヤ1では、横溝3R,3Lの配設位置がずれていない場合と比較して、タイヤ転動時のパターンノイズを減少させ、騒音性能を向上させることができる。
特に、横溝段部33は、横溝第1部分31と横溝第2部分32とを連結するので、中間陸部列MLを構成するブロックのタイヤ周方向一方側Aのタイヤ幅方向外側でエッジ部分を増加させることができる。従って、旋回時に接地面積が大きくなるタイヤ幅方向外側において、エッジによって路面を引っ掻き、旋回性能を向上させることができる。
具体的には、湿潤路面走行時に、タイヤ周方向一方側Aから周方向溝2に入った水は、横溝第1部分31を通り、縦溝4aを流れる水と、横溝第1部分31と横溝段部33との接合部で合流して、横溝段部33へと入る。そして、横溝段部33へと入った水は、横溝段部33と横溝第2部分32との接合部で、縦溝4bと横溝第2部分32へと分流する。横溝第2部分32へと入った水は、タイヤのトレッド端TEへと流れて排出される。一方、縦溝4bに入った水は、周方向他方側Bの横溝3R’の、横溝第1部分31’と横溝段部33’との接合部で、周方向溝2を経て横溝第1部分31’を流れてきた水と合流して、横溝段部33’へと入る。そして、横溝段部33’へと入った水は、横溝段部33’と横溝第2部分32’との接合部で、縦溝4cと横溝第2部分32’へと分流する。横溝第2部分32’へと入った水は、タイヤトレッド端TEへと流れて排出され、縦溝4cに入った水は、さらに横溝3R’’へと入る。このように水が溝内を流れることによって、空気入りタイヤ1では、縦溝4と横溝3との合流部が存在するにも関わらず、合流部での流入と流出を一定に保つことができる為、雪上性能を損なわずに水を効率的に排水することができ、優れた排水性能を発揮することができる。また、横溝段部33及び縦溝4をこのような構成とすることに加え、縦溝4の深さを周方向溝2の深さよりも浅くすることによって、湿潤路面走行時の横溝内での水の流れをより良好にし、排水性能を更に向上させることができる。
Claims (4)
- タイヤ赤道を挟んで延びる1対の周方向溝と、
前記1対の周方向溝によって区画形成されたリブ状の中央陸部列とトレッド端との間でタイヤ幅方向に延びる複数本の横溝と、
前記周方向溝のタイヤ幅方向外側に位置し、タイヤ周方向に隣接する横溝間を連通する縦溝と、
をトレッド踏面に備える空気入りタイヤであって、
前記横溝が、横溝第1部分と、前記横溝第1部分よりもタイヤ幅方向外側に位置する横溝第2部分と、前記横溝第1部分と前記横溝第2部分とを連結する横溝段部とを含み、
前記横溝第1部分のタイヤ幅方向外端の溝幅中心は、前記横溝第2部分のタイヤ幅方向内端の溝幅中心よりもタイヤ周方向一方側に位置し、
前記横溝段部は、前記横溝第1部分のタイヤ幅方向外端と前記横溝第2部分のタイヤ幅方向内端とを連結するようにタイヤ周方向に対して傾斜して延び、
前記縦溝は、タイヤ周方向に対して前記横溝段部とは反対側に傾斜して延在し、
前記縦溝のタイヤ周方向一方側の端部は、タイヤ周方向一方側の横溝の横溝第2部分と横溝段部との接合部に接合し、
前記縦溝のタイヤ周方向他方側の端部は、タイヤ周方向他方側の横溝の横溝第1部分と横溝段部との接合部に接合する
ことを特徴とする、空気入りタイヤ。 - 前記縦溝が、縦溝第1部分と、前記縦溝第1部分のタイヤ周方向一方側に位置する縦溝第2部分と、前記縦溝第1部分と前記縦溝第2部分とを連結する縦溝段部とを含み、
タイヤ周方向に対する前記縦溝段部の傾斜角度が、タイヤ周方向に対する前記縦溝第1部分の傾斜角度および前記縦溝第2部分の傾斜角度よりも大きいことを特徴とする、請求項1に記載の空気入りタイヤ。 - 前記縦溝の深さは、前記周方向溝の深さよりも浅いことを特徴とする、請求項1または2に記載の空気入りタイヤ。
- 前記横溝第2部分が、平面視においてジグザグ状に延在する部分を有することを特徴とする、請求項1~3のいずれか1項に記載の空気入りタイヤ。
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| EP14748799.5A EP2955036B1 (en) | 2013-02-08 | 2014-02-06 | Pneumatic tire |
| CN201480008078.6A CN105008147B (zh) | 2013-02-08 | 2014-02-06 | 充气轮胎 |
| US14/762,907 US10245893B2 (en) | 2013-02-08 | 2014-02-06 | Pneumatic tire |
| RU2015138150A RU2607491C1 (ru) | 2013-02-08 | 2014-02-06 | Пневматическая шина |
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| JP6367139B2 (ja) * | 2015-02-27 | 2018-08-01 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
| USD782960S1 (en) * | 2015-10-02 | 2017-04-04 | Nokian Tyres Plc | Tyre |
| JP6744085B2 (ja) * | 2015-11-17 | 2020-08-19 | Toyo Tire株式会社 | 空気入りタイヤ |
| JP6711172B2 (ja) * | 2016-06-27 | 2020-06-17 | 住友ゴム工業株式会社 | タイヤ |
| EP3323637B1 (en) * | 2016-11-22 | 2019-09-04 | Sumitomo Rubber Industries, Ltd. | Tire |
| CN108725101B (zh) * | 2017-04-18 | 2021-12-03 | 住友橡胶工业株式会社 | 轮胎 |
| CN108859613B (zh) * | 2017-05-16 | 2021-09-24 | 住友橡胶工业株式会社 | 轮胎 |
| EP3643524B1 (en) * | 2017-06-22 | 2022-06-22 | Bridgestone Corporation | Heavy-load tire |
| JP7178813B2 (ja) | 2018-07-04 | 2022-11-28 | 株式会社ブリヂストン | タイヤ |
| US20260070376A1 (en) * | 2024-09-10 | 2026-03-12 | The Goodyear Tire & Rubber Company | Tire with snow sipes |
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| JP5083451B1 (ja) * | 2011-12-07 | 2012-11-28 | 横浜ゴム株式会社 | 空気入りタイヤ |
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- 2013-02-08 JP JP2013023578A patent/JP5620529B2/ja active Active
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2014
- 2014-02-06 WO PCT/JP2014/000639 patent/WO2014122932A1/ja not_active Ceased
- 2014-02-06 EP EP14748799.5A patent/EP2955036B1/en not_active Not-in-force
- 2014-02-06 CN CN201480008078.6A patent/CN105008147B/zh not_active Expired - Fee Related
- 2014-02-06 RU RU2015138150A patent/RU2607491C1/ru active
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| US10245893B2 (en) | 2019-04-02 |
| JP5620529B2 (ja) | 2014-11-05 |
| CN105008147A (zh) | 2015-10-28 |
| RU2607491C1 (ru) | 2017-01-10 |
| US20150352902A1 (en) | 2015-12-10 |
| JP2014151786A (ja) | 2014-08-25 |
| CN105008147B (zh) | 2017-06-06 |
| EP2955036A1 (en) | 2015-12-16 |
| EP2955036A4 (en) | 2016-10-26 |
| EP2955036B1 (en) | 2018-12-12 |
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