WO2015093325A1 - 不整地走行用の自動二輪車用タイヤ及びタイヤ加硫金型 - Google Patents
不整地走行用の自動二輪車用タイヤ及びタイヤ加硫金型 Download PDFInfo
- Publication number
- WO2015093325A1 WO2015093325A1 PCT/JP2014/082310 JP2014082310W WO2015093325A1 WO 2015093325 A1 WO2015093325 A1 WO 2015093325A1 JP 2014082310 W JP2014082310 W JP 2014082310W WO 2015093325 A1 WO2015093325 A1 WO 2015093325A1
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- WIPO (PCT)
- Prior art keywords
- tire
- circumferential direction
- tread
- block
- axial direction
- Prior art date
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
-
- 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
- B60C11/032—Patterns comprising isolated recesses
-
- 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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1353—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
- B29D2030/0607—Constructional features of the moulds
- B29D2030/0612—Means for forming recesses or protrusions in the tyres, e.g. grooves or ribs, to create the tread or sidewalls patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
- B29D2030/0607—Constructional features of the moulds
- B29D2030/0617—Venting devices, e.g. vent plugs or inserts
-
- 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
- B60C11/1353—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom
- B60C2011/1361—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom with protrusions extending from the groove bottom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/10—Tyres specially adapted for particular applications for motorcycles, scooters or the like
-
- 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
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/14—Tyres specially adapted for particular applications for off-road use
Definitions
- the present invention relates to a motorcycle tire for traveling on rough terrain with improved durability performance of a block provided in a tread portion, and a tire vulcanization mold capable of forming the tire.
- a recessed portion in which a groove bottom surface of a tread portion is locally recessed is provided between adjacent blocks in the tire circumferential direction. Such a recess can reduce stress concentration at the base of the block and improve the durability of the block.
- the present invention has been devised in view of the actual situation as described above, and is based on the fact that a plurality of recesses are provided on the bottom surface of the groove, and a spew or excision mark is provided between each recess and the block.
- the main object of the present invention is to provide a motorcycle tire for running on rough terrain with improved block durability and a tire vulcanization mold that can mold the tire.
- the invention according to claim 1 is a motorcycle tire for running on rough terrain in which a plurality of blocks protruding in the tire radial direction from the groove bottom surface are provided at intervals in the tire circumferential direction on the tread portion.
- the groove bottom surface between the adjacent blocks in the tire circumferential direction is provided with a recess, and a plurality of the recesses are provided at intervals in the tire axial direction, and the recesses are adjacent to each other in the tire circumferential direction.
- a spew sucked up in a vent hole of a mold at the time of vulcanization molding or a cut mark thereof is provided.
- the invention according to claim 2 is the motorcycle tire for running on rough terrain according to claim 1, wherein the recess has a longitudinal shape in which the length in the tire circumferential direction is larger than the length in the tire axial direction.
- the invention according to claim 3 is the motorcycle tire for rough terrain travel according to claim 1 or 2, wherein the recess is provided with 6 to 10 recesses in the tire axial direction.
- the tread portion of a motorcycle tire for running on uneven terrain is formed in which a plurality of blocks protruding in the tire radial direction from the groove bottom surface are provided at intervals in the tire circumferential direction.
- a tire vulcanization mold having a tread molding surface, wherein the tread molding surface is adjacent to each other in a tire circumferential direction, a first portion for molding the groove bottom surface, a plurality of second portions for molding each block.
- a convex third portion formed between the second portions and forming a recess in the groove bottom surface, wherein the third portion is provided at a plurality of intervals in a tire axial direction;
- the first part between the first part and the third part has one end opened at the tread molding surface and the other end communicated with the outside of the mold, so that air can be discharged outside the mold during vulcanization. There is a vent hole And said that you are.
- the invention according to claim 5 is the tire vulcanization mold according to claim 4, wherein the third portion has a vertically long shape in which the length in the tire circumferential direction is larger than the length in the tire axial direction.
- the invention according to claim 6 is the tire vulcanization mold according to claim 4 or 5, wherein the hole diameter of the vent hole is 0.5 mm to 1.5 mm.
- the invention according to claim 7 is the tire vulcanization mold according to any one of claims 4 to 6, wherein the third portion is provided with 6 to 10 in the tire axial direction.
- the distance in the tire circumferential direction between the edge of the vent hole and the end of the third portion in the tire circumferential direction is 1 mm to 6 mm.
- the motorcycle tire for traveling on rough terrain is provided with a recess on the bottom surface of the groove between adjacent blocks in the tire circumferential direction.
- a plurality of recesses are provided at intervals in the tire axial direction.
- a spewed up by a vent hole of the mold at the time of vulcanization molding or a cut mark thereof is provided.
- the concave portion and the block are vulcanized and formed in the tread portion, residual gas that tends to be generated between the block and the concave portion can be suppressed.
- molding defects at the base of the block can be suppressed, and as a result, the occurrence of scratches that can cause the durability performance of the block to deteriorate can be suppressed.
- the motorcycle tire for running on rough terrain of the present invention improves the block durability performance.
- FIG. 1 is a cross-sectional view showing an embodiment of a motorcycle tire for running on rough terrain according to the present invention.
- FIG. 2 is a development view of the tread portion of FIG. 1.
- FIG. 3 is a sectional view taken along line BB in FIG. 1 is a partial perspective view of a tire vulcanization mold for molding a tire of the present invention. It is explanatory drawing explaining vulcanization molding.
- FIG. 1 and FIG. 2 illustrate a motocross racing tire as a motorcycle tire (hereinafter simply referred to as “tire”) 1 for traveling on rough terrain according to the present embodiment.
- FIG. 1 is a tire meridian cross-sectional view including a tire rotation axis in a normal state of the tire 1.
- FIG. 2 is a development view of the tread portion 2 of the tire 1 of FIG. A cross-sectional view along AA in FIG. 2 is shown in FIG.
- the “normal state” is a no-load state in which a tire is assembled on a normal rim (not shown) and filled with a normal internal pressure.
- a normal rim not shown
- the dimensions and the like of each part of the tire are values measured in this normal state.
- the “regular rim” is a rim determined for each tire in the standard system including the standard on which the tire is based. For example, in the case of JATMA, “standard rim”, in the case of TRA “Design Rim”, in the case of ETRTO, “Measuring Rim”.
- the “regular internal pressure” is the air pressure defined by each standard for each tire in the standard system including the standard on which the tire is based.
- the tire 1 of the present embodiment includes a carcass 6 that extends from the tread portion 2 through the sidewall portion 3 to the bead core 5 of the bead portion 4, and the outer side in the tire radial direction of the carcass 6 and the tread portion 2.
- a belt layer 7 disposed inwardly of the belt and a bead apex rubber 8 that extends in a tapered manner from the bead core 5 toward the outer side in the tire radial direction.
- the carcass 6 includes, for example, two carcass plies 6A and 6B.
- Each of the carcass plies 6A and 6B includes a main body portion 6a extending from the tread portion 2 through the sidewall portion 3 to the bead core 5 embedded in the bead portion 4, and a folded portion connected to the main body portion 6a and folded around the bead core 5. 6b.
- the carcass plies 6A and 6B are provided with carcass cords arranged to be inclined with respect to the tire equator C.
- the carcass cords intersect between the carcass plies 6A and 6B.
- the carcass plies 6A and 6B of the present embodiment have a radial structure in which carcass cords are arranged at an angle of 65 ° to 90 ° with respect to the tire equator C.
- the carcass plies 6A and 6B may have a bias structure in which carcass cords are arranged at an angle of 15 ° to 45 ° with respect to the tire equator C.
- an organic fiber cord such as nylon, polyester, or rayon is suitably used.
- the belt layer 7 is composed of, for example, one belt ply 7A.
- a belt cord is arranged on the belt ply 7A so as to be inclined with respect to the tire equator C.
- As the belt cord for example, aramid or rayon is suitably employed.
- the bead apex rubber 8 is made of hard rubber.
- the bead apex rubber 8 is disposed between the main body portion 6a and the folded portion 6b.
- the bead apex rubber 8 reinforces the bead portion 4 and the sidewall portion 3.
- the outer surface 2s between the tread ends Te and Te of the tread portion 2 protrudes outward in the tire radial direction and extends in an arc shape. As a result, the tread portion 2 can obtain a sufficient ground contact area even during turning with a large camber angle.
- the tread width TW which is the distance in the tire axial direction between the tread ends Te, Te, is set to the maximum tire width.
- the rotation direction R is designated for the tread portion 2 of the present embodiment.
- the rotation direction R is displayed by, for example, characters or marks on a sidewall portion or the like.
- the tread part 2 is provided with a block 10.
- the block 10 protrudes outward in the tire radial direction from the groove bottom surface 9 d of the tread groove 9.
- a plurality of blocks 10 are provided at intervals L1 in the tire circumferential direction.
- the groove bottom surface 9 d is a bottom surface of the tread groove 9 and is a surface extending smoothly along the outer surface of the carcass 6.
- the interval L1 between the blocks 10 and 10 adjacent to each other in the tire circumferential direction is preferably 2.0% or more, more preferably 2.5% or more of the circumferential length CL of one circumference of the tire on the tire equator C. , Preferably 3.0% or less, more preferably 2.8% or less.
- the rubber hardness of the block 10 is preferably 55 degrees or more, more preferably 65 degrees or more, preferably 95 degrees or less, more preferably 85 degrees or less.
- the rubber hardness of the block 10 is smaller than 55 degrees, the rigidity of the block 10 cannot be sufficiently secured, and a sufficient grip force may not be obtained.
- the rubber hardness of the block is larger than 95 degrees, the flexibility of the block 10 is lowered, and the durability performance of the block may be lowered.
- the rubber hardness is a hardness according to durometer type A in an environment of 23 ° C. according to JIS-K6253.
- the block 10 of the present embodiment includes a center block 11 formed on the tire equator C, a shoulder block 12 arranged on the most tread end Te side, and a middle block 13 between the center block 11 and the shoulder block 12. Contains.
- the center block 11 includes, for example, a first portion 18 and a second portion 19.
- the first portion 18 has a horizontally long rectangular shape that is long in the tire axial direction.
- the first portion 18 is convex and curved on the side opposite to the rotation direction R of the tire 1.
- the second portion 19 protrudes from the first portion 18 to both sides in the tire circumferential direction at a position on the tire equator C.
- the tread surface of the center block 11 is formed in a substantially cross shape.
- Such a center block 11 can effectively improve the traction performance of the tire.
- the width W1 in the tire circumferential direction of the first portion 18 is preferably 0.10 times or more, more preferably 0.15 times or more, preferably 0.30 times or less, more preferably 0.25 times the interval L1. Is less than double. Thereby, the block 10 can be made to bite into a road surface effectively, and a grip force improves further.
- the shoulder block 12 includes, for example, end edges 12e and 12e extending in the tire circumferential direction, and is formed in a substantially trapezoidal shape.
- the length W2 of the shoulder block 12 in the tire circumferential direction gradually increases toward the outer side in the tire axial direction. Such a shoulder block 12 can improve the steering stability performance during turning.
- the middle block 13 includes end edges 13e and 13e extending in the tire circumferential direction, and is formed in a substantially trapezoidal shape.
- the middle block 13 includes an inner portion 13a and an outer portion 13b.
- the width W3 of the inner part 13a is kept constant.
- the width W3 of the outer portion 13b is gradually increased toward the outer side in the tire axial direction.
- the land sea ratio of the tire 1 of the present embodiment is, for example, 10% to 20%, preferably 13% to 18%.
- the land sea ratio is a ratio of the total area of the tread surface 10s of the block 10 to the total area of the outer surface of the tread portion 2 when it is assumed that the tread groove 9 is completely filled.
- a recess 15 is provided on the groove bottom surface 9d between the blocks 10 and 10 adjacent in the tire circumferential direction.
- the recessed part 15 is provided in the tread center area
- a plurality of the recesses 15 are provided at intervals in the tire axial direction.
- the recesses 15 are provided at equal intervals in the tire axial direction.
- the number N1 of the recesses 15 provided in the tire axial direction is not particularly limited, but is preferably 6 or more, more preferably 7 or more, preferably 10 or less, more preferably 9 or less.
- the number N1 is smaller than 6, the rigidity of the groove bottom surface 9d may not be uniformly relaxed. Conversely, if the number N1 is greater than 10, the rigidity of the groove bottom surface 9d may be excessively reduced.
- each recess 15 of the present embodiment is formed in an oval shape including vertical edges 20 and 20 extending in the tire circumferential direction and an arc portion 21.
- the pair of vertical edges 20, 20 extends, for example, linearly in parallel with each other in the tire circumferential direction.
- the circular arc part 21 has joined between the vertical edges 20 and 20 in circular arc shape. Such a recess 15 can suppress the generation of cracks from the edge 15e.
- the length L2 of the recess 15 in the tire axial direction is preferably 0.10 times or more, more preferably 0.12 times or more, preferably 0.16 times or less, more preferably 0.14 times the tread deployment width TWe. Is less than double.
- the length L2 of the recess 15 in the tire axial direction is smaller than 0.10 times the tread development width TWe, the above-described effect may be reduced.
- the length L2 is greater than 0.16 times the tread development width TWe, the rigidity of the groove bottom surface 9d may be locally reduced.
- the length L3 of the recess 15 in the tire circumferential direction is desirably larger than the length L2 in the tire axial direction.
- the ratio L3 / L2 of the length L3 of the recess 15 in the tire circumferential direction and the length L2 in the tire axial direction is preferably 3.0 or more, more preferably 3.4. That's it.
- the ratio L3 / L2 is preferably 4.2 or less, more preferably 3.8 or less.
- FIG. 3 shows a BB cross section of FIG.
- the recess 15 includes a bottom portion 22 and a side wall portion 23.
- the bottom portion 22 extends along the virtual surface 9v on the inner side in the tire radial direction from the virtual surface 9v obtained by extending the groove bottom surface 9d.
- the side wall portion 23 connects the groove bottom surface 9 d and the bottom portion 22.
- the depth d1 of the recess 15 is preferably 0.5 mm or more, more preferably 0.8 mm or more, preferably 1.5 mm or less, more preferably 1.2 mm or less.
- the depth d1 of the recessed part 15 is smaller than 0.5 mm, there exists a possibility that the effect mentioned above may not fully be exhibited.
- the depth d1 of the recess 15 is larger than 1.5 mm, the rigidity of the groove bottom surface 9d of the tread portion 2 is lowered, and the steering stability performance may be lowered.
- the distance W4 in the tire axial direction between the recesses 15 and 15 adjacent in the tire axial direction is preferably 1.10 times or more the length L2 of the concave portion 15 in the tire axial direction. Preferably it is 1.20 times or more, preferably 1.35 times or less, more preferably 1.30 times or less.
- the distance W4 is smaller than 1.10 times the length L2, the rigidity of the groove bottom surface 9d between the blocks 10 and 10 may be excessively lowered.
- the distance W4 is greater than 1.35 times the length L2, the stress concentration at the base of the block 10 may not be reduced.
- FIG. 4 is a partial perspective view of the tire vulcanization mold 30.
- the tire vulcanization mold 30 includes a tread molding surface 31 that forms the tread portion 2 of the tire 1 of the present invention shown in FIG.
- a range a1 of the tread portion 2 shown in FIG. 2 is formed by the tread molding surface 31 shown in FIG.
- the tread molding surface 31 includes a first portion 32 that molds the groove bottom surface 9d (shown in FIG. 2), and a plurality of second portions that mold each block 10 (shown in FIG. 2). 33 and a convex third portion 34 for shaping the recess 15 (shown in FIG. 2).
- the third portion 34 is provided between the second portions 33 and 33 adjacent in the tire circumferential direction.
- the third portion 34 has a vertically long shape in which the length in the tire circumferential direction is larger than the length in the tire axial direction.
- the third portion 34 forms a recess 15 (shown in FIG. 2) that is recessed from the groove bottom surface 9d.
- a plurality of third portions 34 are provided at intervals in the tire axial direction.
- the number N2 of the third portions 34 provided in the tire axial direction is the same as the number of the recesses 15. That is, the number N2 of the third portions 34 is preferably 6 or more, more preferably 7 or more, preferably 10 or less, more preferably 9 or less.
- a vent hole 35 is provided in the first portion 32m between the second portion 33 and the third portion 34.
- One end 36 of the vent hole 35 opens at the tread molding surface 31.
- the other end 37 of the vent hole 35 communicates with the outside of the mold and is connected to a vacuum device (not shown). By such a vent hole 35, the air between the mold and the raw cover can be discharged to the outside of the mold.
- FIG. 5 shows a cross-sectional view taken along the line C when the tire vulcanizing mold 30 shown in FIG. 4 is vulcanized.
- the tire vulcanization mold 30 is brought into close contact with the tread rubber 2g.
- the tread rubber 2g has a pressed portion 40 pressed by the first portion 32 and the third portion 34 and a sucked portion 41 sucked by the second portion 33, and the rubber moves in the direction of the arrow 42.
- the block 10 shown in FIG.
- the movement of the rubber described above is particularly large. It needs to be generated. For this reason, when there is no vent hole 35 between the second portion 33 and the third portion 34, the gap 38 is generated due to the poor movement of the rubber, and a fine vulcanization molding failure occurs at the base of the block 10.
- the vent hole 35 is provided between the second portion 33 and the third portion, the generation of the air gap 38 can be suppressed. For this reason, poor vulcanization molding at the base of the block 10 is suppressed, and as a result, the durability of the block 10 can be improved.
- the hole diameter L4 of the vent hole 35 is preferably 0.5 mm or more, more preferably 0.8 mm or more, preferably 1.5 mm or less, more preferably 1. 2 mm or less.
- the distance L5 in the tire circumferential direction between the edge 35e of the vent hole 35 and the end 34t of the third portion 34 in the tire circumferential direction is large, there is a possibility that gas tends to remain. is there.
- the distance L5 is preferably 6.0 mm or less, more preferably 4.0 mm or less.
- the distance L5 is preferably 1.0 mm or more, more preferably 3.0 mm or more.
- vent hole 35 is provided between the extended lines 39 and 39 extending in the tire circumferential direction from the edges 34e and 34e on both sides in the tire axial direction of the third portion 34, respectively.
- a pneumatic tire for a motorcycle for running on rough terrain having the basic structure shown in FIG. 1 and having the tread pattern of FIG. 2 as a basic pattern was prototyped based on the specifications shown in Table 1.
- Comparative Example 1 a tire in which a recess was not provided on the groove bottom surface was manufactured.
- Comparative Examples 2 to 5 a tire in which a concave portion was provided on the bottom surface of the groove and a spew and a cut mark thereof were not provided between the concave portion and the block was manufactured.
- These prototype tires were mounted on the rear wheels of the test vehicle, and their performance was tested.
- the common specifications and test methods for each test tire are as follows. Vehicle used: Displacement 450cc Motorcycle Tire size: 110 / 90-19 Rim size: 2.50 ⁇ 19 Internal pressure: 80 kPa
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Description
2 トレッド部
9d 溝底面
10 ブロック
15 凹部
17 切除痕
30 タイヤ加硫金型
図1及び図2には、本実施形態の不整地走行用の自動二輪車用タイヤ(以下、単に「タイヤ」ということがある。)1として、モトクロス競技用のタイヤが例示される。図1は、タイヤ1の正規状態でのタイヤ回転軸を含むタイヤ子午線断面図である。図2は、図1のタイヤ1のトレッド部2の展開図である。図2のA-A断面図が、図1に示されている。
使用車両:排気量450cc 自動二輪車
タイヤサイズ:110/90-19
リムサイズ:2.50×19
内圧:80kPa
上記条件にて、不整地路面のテストコースを実車走行したときの操縦安定性能が、運転者の官能によりテストされた。結果は、比較例1の値を100とする評点であり、数値が大きい程良好であることを示す。
不整地路面を3時間走行後のブロックに発生したクラックの数が測定された。結果は、発生したクラックの数の逆数であり、比較例1を100とする指数で表示されている。数値が大きい程、ブロックの耐久性能が優れていることを示す。
テストの結果を表1に示す。
Claims (8)
- トレッド部に、溝底面からタイヤ半径方向に隆起した複数のブロックがタイヤ周方向に間隔をもって設けられた不整地走行用の自動二輪車用タイヤであって、
タイヤ周方向で隣り合う前記ブロックの間の前記溝底面には、凹部が設けられ、
前記凹部は、タイヤ軸方向に間隔をもって複数個設けられ、
前記各凹部とタイヤ周方向で隣り合う前記ブロックとの間には、加硫成形時に金型のベントホールに吸い上げられたスピュー又はその切除痕が設けられていることを特徴とする不整地走行用の自動二輪車用タイヤ。 - 前記凹部は、タイヤ周方向の長さがタイヤ軸方向の長さよりも大きい縦長状である請求項1記載の不整地走行用の自動二輪車用タイヤ。
- 前記凹部は、タイヤ軸方向に6個~10個設けられている請求項1又は2記載の不整地走行用の自動二輪車用タイヤ。
- トレッド部に、溝底面からタイヤ半径方向に隆起した複数のブロックがタイヤ周方向に間隔をもって設けられた不整地走行用の自動二輪車用タイヤの前記トレッド部を成形するトレッド成形面を具えたタイヤ加硫金型であって、
前記トレッド成形面は、前記溝底面を成形する第1部分、前記各ブロックを成形する複数の第2部分、タイヤ周方向で隣り合う前記第2部分の間に設けられ、かつ、前記溝底面に凹部を成形する凸状の第3部分を含み、
前記第3部分は、タイヤ軸方向に複数個間隔をもって設けられ、
前記第2部分と前記第3部分との間の前記第1部分には、一端が前記トレッド成形面で開口しかつ他端が金型外部に連通することにより、加硫時に空気を金型外部に排出しうるベントホールが設けられていることを特徴とするタイヤ加硫金型。 - 前記第3部分は、タイヤ周方向の長さがタイヤ軸方向の長さよりも大きい縦長状である請求項4記載のタイヤ加硫金型。
- 前記ベントホールの穴径は、0.5mm~1.5mmである請求項4又は5記載のタイヤ加硫金型。
- 前記第3部分は、タイヤ軸方向に6個~10個設けられている請求項4乃至6のいずれかに記載のタイヤ加硫金型。
- 前記ベントホールの端縁と、前記第3部分のタイヤ周方向の端部とのタイヤ周方向の距離が、1mm~6mmである請求項4乃至7のいずれかに記載のタイヤ加硫金型。
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JP2020083151A (ja) * | 2018-11-28 | 2020-06-04 | Toyo Tire株式会社 | 空気入りタイヤ、タイヤ加硫金型、及び空気入りタイヤの製造方法 |
JP2021084554A (ja) * | 2019-11-28 | 2021-06-03 | 住友ゴム工業株式会社 | 不整地走行用の二輪車用タイヤ |
JP2021187173A (ja) * | 2020-05-25 | 2021-12-13 | 住友ゴム工業株式会社 | 不整地走行用の二輪車用タイヤ |
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