CN107323178A - A kind of strong tire tread of superior skid resistance of earth-catching property - Google Patents

A kind of strong tire tread of superior skid resistance of earth-catching property Download PDF

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Publication number
CN107323178A
CN107323178A CN201710473512.3A CN201710473512A CN107323178A CN 107323178 A CN107323178 A CN 107323178A CN 201710473512 A CN201710473512 A CN 201710473512A CN 107323178 A CN107323178 A CN 107323178A
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CN
China
Prior art keywords
pattern zone
pattern
earth
tire tread
type structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710473512.3A
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Chinese (zh)
Inventor
盛建业
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.)
Taicang Round Auto Parts Co Ltd
Original Assignee
Taicang Round Auto Parts Co Ltd
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 Taicang Round Auto Parts Co Ltd filed Critical Taicang Round Auto Parts Co Ltd
Priority to CN201710473512.3A priority Critical patent/CN107323178A/en
Publication of CN107323178A publication Critical patent/CN107323178A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/0028—Reinforcements comprising mineral fibres, e.g. glass or carbon fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/10—Layered products comprising a layer of natural or synthetic rubber next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/18—Layered products comprising a layer of natural or synthetic rubber comprising butyl or halobutyl rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/005—Reinforcements made of different materials, e.g. hybrid or composite cords
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/14—Mixture of at least two fibres made of different materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554—Wear resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56—Damping, energy absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars
    • 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

Landscapes

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

Abstract

The present invention provides a kind of superior skid resistance of earth-catching property strong tire tread, and the tire tread includes bottom, middle enhancement layer and superficial layer；The superficial layer includes central pattern zone, the first flower-pattern layer and the second pattern zone；The central pattern zone is made up of some groups of diamond structures；The central pattern zone both sides are respectively arranged with the first pattern zone and the second pattern zone, and first pattern zone includes some groups of L-type structures, and the L-type structure head and the tail, which cooperate to surround, to be formed；L-type structure in second pattern zone in L-type structure and the first flower-pattern layer is staggered；The present invention provides a kind of superior skid resistance of earth-catching property strong tire tread, by setting central pattern zone, the first flower-pattern layer and the second pattern zone, it is possessed excellent earth-catching property；The tire tread structure sets simple, and decorative pattern sets reasonable, enhances draining and the non-skid property of tire, improves drive safety.

Description

A kind of strong tire tread of superior skid resistance of earth-catching property
Technical field
The present invention relates to tire art, and in particular to a kind of strong tire tread of superior skid resistance of earth-catching property.
Background technology
Tire is the round and elastic connector between automobile and road, is the walking structure of automobile.First, tire it to ground The driving of face transmission automobile, the active force for turning to and braking, such as：The functions such as driving force, tractive force, brake force and steering force；Its It is secondary, tire be able to must make automobile various weathers, road surface and speed downward driving freely, the function of operation stabilization and high-speed secure； Again, tire must play damping vibration, reduce noise, the function of ride comfort.And tyre tread structure is tire embodies this The main expression-form of a little functions.
At present, substantially designed during most domestic tire producer design pattern structure according to differentiation.Tyre tread city The accommodation of field is also by popular steering minorityization, and requirement more and more higher of the market to tire is also required to factory and gone on business certainly The tyre tread of alienation adapts to the market increasingly segmented.
Tyre tread is the position that automobile is directly contacted with road surface, and main function is to increase the friction between tyre surface and road surface Power, ensures the normal performance of vehicle dynamic quality, braking, steer ability and riding stability, prevents wheel-slip.And decorative pattern The effect of performance depends on decorative pattern shape and its permutation and combination.
The poor-performing of existing tyre tread often anti-skid wearable, especially under weather condition of snowing, tire Earth-catching property is poor, makes its tractive force, braking ability reduction, easily skids, influence automobile driving safe.
Based on above prior art problem, this invention address that studying, a kind of performance is more superior, drives safer wheel Tire tread.
The content of the invention
To solve above-mentioned problem, strong it is an object of the invention to provide a kind of superior skid resistance of earth-catching property Tire tread, by setting central pattern zone, the first flower-pattern layer and the second pattern zone, makes it possess excellent earth-catching property；Institute State tire tread structure and set simple, decorative pattern sets reasonable, enhances draining and the non-skid property of tire, improves driving safety Property.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of strong tire tread of superior skid resistance of earth-catching property, the tire tread includes bottom, middle enhancement layer and table Surface layer；The bottom is the composite bed of butadiene rubber and binder resin；The middle enhancement layer is carbon nano-fiber and glass fibers The composite bed of dimension；The superficial layer is the composite bed of solution polymerized butadiene styrene rubber butadiene-styrene rubber and epoxy natural rubber；The tire Tyre surface is compounded to form by three layers of bottom, middle enhancement layer and superficial layer, is enhanced the anti-wear performance of tire tread, is improved tire Service life.
The superficial layer includes central pattern zone, the first flower-pattern layer and the second pattern zone, and the superficial layer is by disposable thermal Molded to form, technique is simple, and manufacturing cost is relatively low；The central pattern zone is made up of some groups of diamond structures, by by Centre pattern zone is designed to diamond structure, makes it have enough brake force and good maneuvering performance, it is not easy to break away；
The central pattern zone both sides are respectively arranged with the first pattern zone and the second pattern zone, and first pattern zone includes some Group L-type structure, the L-type structure head and the tail, which cooperate to surround, to be formed, L-type structure and the first flower-pattern layer in second pattern zone In L-type structure it is staggered；By setting the circular L-type structure that cooperates from beginning to end to not only increase the anti-skid wearable of tire Performance, and its monnolithic case is also more beautiful, generous, meets the aesthetic requirement of modern consumer.
Further, it is respectively equipped with a row oval convex between the central pattern zone and the first pattern zone, the second pattern zone Rise, improve the ground-grabbing antiskid performance of tyre surface.
Further, every group of L-type structure head and the tail interval in first pattern zone and the second pattern zone does not connect, so every Dead slot is formed in the middle of group L-type structure, the anti-skidding earth-catching property of tyre surface is further enhancing.
In addition, being provided with first groove in first pattern zone between every group of L-type structure, the first groove is waveform Groove, by setting wave-shaped trench, further enhances the drain function of tire, improves the anti-sideslip of tire, inclined slip energy, enters one Step improves the earth-catching property of tyre surface, ensures the security driven.
Separately have, be provided with second groove in second pattern zone between every group of L-type structure, the second groove is wave Shape groove, by setting wave-shaped trench, further enhances the drain function of tire, improves the anti-sideslip of tire, inclined slip energy, enters One step improves the earth-catching property of tyre surface, ensures the security driven.
The beneficial effects of the present invention are：
The present invention provides a kind of superior skid resistance of earth-catching property strong tire tread, by setting central pattern zone, the first flower Lamina and the second pattern zone, make it possess excellent earth-catching property；The tire tread structure sets simple, and decorative pattern, which is set, to be closed Reason, good appearance enhances draining and the non-skid property of tire, improves drive safety.
Brief description of the drawings
Fig. 1 provides the structural representation of superficial layer in a kind of strong tire tread of the superior skid resistance of earth-catching property for the present invention Figure；
Fig. 2 provides a kind of structural representation of the strong tire tread of the superior skid resistance of earth-catching property for the present invention；
Wherein, 1 is bottom, and 2 be middle enhancement layer, and 3 be superficial layer, and 4 be central pattern zone, and 5 be diamond structure, and 6 be the first flower Line area, 7 be the second pattern zone, and 8 be L-type structure, and 9 be first groove, and 10 be second groove, and 11 be elliptical shaped lobes.
Embodiment
Clear, complete description will be carried out to the technical scheme in the embodiment of the present invention below, it is clear that described implementation Example only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common The every other embodiment that technical staff is obtained on the premise of creative work is not made, belongs to what the present invention was protected Scope.
Referring to Fig. 1, Fig. 2, a kind of strong tire tread of superior skid resistance of earth-catching property, the tire tread includes bottom 1st, middle enhancement layer 2 and superficial layer 3；The bottom 1 is the composite bed of butadiene rubber and binder resin；The middle enhancement layer 2 For carbon nano-fiber and the composite bed of glass fibre；The superficial layer 3 is that solution polymerized butadiene styrene rubber butadiene-styrene rubber and epoxidation are natural The composite bed of rubber；The tire tread is compounded to form by 3 three layers of bottom 1, middle enhancement layer 2 and superficial layer, enhances wheel The anti-wear performance of tire tread, improves the service life of tire.
The superficial layer 3 includes central pattern zone 4, the first flower-pattern layer 6 and the second pattern zone 7, and the superficial layer 3 is by once Property it is hot-forming form, technique is simple, and manufacturing cost is relatively low；The central pattern zone 4 is made up of some groups of diamond structures 5, is led to Cross and central pattern zone 4 is designed to diamond structure 5, make it have enough brake force and good maneuvering performance, it is not easy to send out It is raw to break away；
The both sides of central pattern zone 4 are respectively arranged with the first pattern zone 6 and the second pattern zone 7, and first pattern zone 6 includes Some groups of L-type structures 8, the L-type structure 8 cooperates around forming from beginning to end, L-type structure 8 and the in second pattern zone 7 L-type structure 8 in one flower-pattern layer 6 is staggered；Wheel is not only increased by the L-type structure 8 for setting head and the tail to cooperate circular The anti-skid wearable performance of tire, and its monnolithic case is also more beautiful, generous, meets the aesthetic requirement of modern consumer.
Further, row ellipse is respectively equipped between the pattern zone 6 of central pattern zone 4 and first, the second pattern zone 7 Projection 11, improves the ground-grabbing antiskid performance of tyre surface.
Further, every group of L-type structure 8 in the pattern zone 7 of the first pattern zone 6 and second is spaced from beginning to end does not connect, this Dead slot is formed in the middle of every group of L-type structure of sample 8, the anti-skidding earth-catching property of tyre surface is further enhancing.
In addition, being provided with first groove 9 in first pattern zone 6 between every group of L-type structure 8, the first groove 9 is ripple Shape wave groove, by setting wave-shaped trench, further enhances the drain function of tire, improves the anti-sideslip of tire, inclined slip energy, The earth-catching property of tyre surface is further improved, the security driven is ensured.
Separately have, be provided with second groove 10, the second groove 10 in second pattern zone 7 between every group of L-type structure 8 For wave-shaped trench, by setting wave-shaped trench, the drain function of tire is further enhanced, the anti-sideslip of tire is improved, slides partially Performance, further improves the earth-catching property of tyre surface, ensures the security driven.
The present invention provides a kind of superior skid resistance of earth-catching property strong tire tread, by setting central pattern zone, the One flower-pattern layer and the second pattern zone, make it possess excellent earth-catching property；The tire tread structure sets simple, and decorative pattern is set Rationally, good appearance, enhances draining and the non-skid property of tire, improves drive safety.
It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although with reference to compared with The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the technology of invention Scheme is modified or equivalent substitution, and without departing from the scope of technical solution of the present invention, it all should cover the power in the present invention In sharp claimed range.

Claims (5)

1. a kind of strong tire tread of superior skid resistance of earth-catching property, it is characterised in that the tire tread include bottom, in Between enhancement layer and superficial layer；
The bottom is the composite bed of butadiene rubber and binder resin；
The middle enhancement layer is the composite bed of carbon nano-fiber and glass fibre；
The superficial layer is the composite bed of solution polymerized butadiene styrene rubber butadiene-styrene rubber and epoxy natural rubber；
The superficial layer includes central pattern zone, the first flower-pattern layer and the second pattern zone, and the superficial layer is pressed into by disposable thermal Type is formed；
The central pattern zone is made up of some groups of diamond structures；
The central pattern zone both sides are respectively arranged with the first pattern zone and the second pattern zone, and first pattern zone includes some Group L-type structure, the L-type structure head and the tail, which cooperate to surround, to be formed；
L-type structure in second pattern zone in L-type structure and the first flower-pattern layer is staggered.
2. the strong tire tread of the superior skid resistance of a kind of earth-catching property according to claim 1, it is characterised in that described A row elliptical shaped lobes are respectively equipped between central pattern zone and the first pattern zone, the second pattern zone.
3. the strong tire tread of the superior skid resistance of a kind of earth-catching property according to claim 1, it is characterised in that described Every group of L-type structure head and the tail interval in first pattern zone and the second pattern zone does not connect.
4. the strong tire tread of the superior skid resistance of a kind of earth-catching property according to claim 1, it is characterised in that described First groove is provided with first pattern zone between every group of L-type structure, the first groove is wave-shaped trench.
5. the strong tire tread of the superior skid resistance of a kind of earth-catching property according to claim 1, it is characterised in that described Second groove is provided with second pattern zone between every group of L-type structure, the second groove is wave-shaped trench.
CN201710473512.3A 2017-06-21 2017-06-21 A kind of strong tire tread of superior skid resistance of earth-catching property Pending CN107323178A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710473512.3A CN107323178A (en) 2017-06-21 2017-06-21 A kind of strong tire tread of superior skid resistance of earth-catching property

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710473512.3A CN107323178A (en) 2017-06-21 2017-06-21 A kind of strong tire tread of superior skid resistance of earth-catching property

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Publication Number Publication Date
CN107323178A true CN107323178A (en) 2017-11-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191318710A (en) * 1913-08-18 1914-08-13 Dunlop Rubber Co Improvements in or relating to Tyres for Vehicle and similar Wheels.
CN203126400U (en) * 2013-02-27 2013-08-14 天津大丰橡胶工业有限公司 Tread pattern structure of tyre of extreme bicycle motocross
CN103770576A (en) * 2014-01-21 2014-05-07 青岛双星轮胎工业有限公司 Puncture-resistant prevulcanization tire tread
CN205930049U (en) * 2016-08-23 2017-02-08 青岛双星轮胎工业有限公司 Tire pattern
CN207059651U (en) * 2017-06-21 2018-03-02 太仓轮达汽车配件有限公司 A kind of superior tire tread of earth-catching property

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191318710A (en) * 1913-08-18 1914-08-13 Dunlop Rubber Co Improvements in or relating to Tyres for Vehicle and similar Wheels.
CN203126400U (en) * 2013-02-27 2013-08-14 天津大丰橡胶工业有限公司 Tread pattern structure of tyre of extreme bicycle motocross
CN103770576A (en) * 2014-01-21 2014-05-07 青岛双星轮胎工业有限公司 Puncture-resistant prevulcanization tire tread
CN205930049U (en) * 2016-08-23 2017-02-08 青岛双星轮胎工业有限公司 Tire pattern
CN207059651U (en) * 2017-06-21 2018-03-02 太仓轮达汽车配件有限公司 A kind of superior tire tread of earth-catching property

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Application publication date: 20171107