KR20000020158A - Pneumatic radial tire - Google Patents

Pneumatic radial tire Download PDF

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Publication number
KR20000020158A
KR20000020158A KR1019980038628A KR19980038628A KR20000020158A KR 20000020158 A KR20000020158 A KR 20000020158A KR 1019980038628 A KR1019980038628 A KR 1019980038628A KR 19980038628 A KR19980038628 A KR 19980038628A KR 20000020158 A KR20000020158 A KR 20000020158A
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South Korea
Prior art keywords
curvature
tire
radius
belt
crown
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KR1019980038628A
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Korean (ko)
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KR100545889B1 (en
Inventor
김균옥
이동윤
한상배
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홍건희
한국타이어 주식회사
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Publication of KR20000020158A publication Critical patent/KR20000020158A/en
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Publication of KR100545889B1 publication Critical patent/KR100545889B1/en

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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
    • B60C11/0083—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the curvature of the tyre tread
    • 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
    • B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
    • 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
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0033—Thickness of the tread

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

Abstract

PURPOSE: A pneumatic radial tire is provided to improve durability and a grounding shape of a tire belt by differently forming a tire radius of a crown center and a shoulder unit and by making a curvature radius of the crown center straight that is infinite. CONSTITUTION: A curvature radius of a crown center is formed in a straight but the range of the straight is 50 to 70% of a tire section width and the curvature of a belt layer(1) is formed in a straight but the range of the straight is in the whole width of the belt. The curvature radius of a tread unit(2) is formed not to be parallel with the curvature of the belt layer and the value of the radius is 300 to 600% of the section width. A tread thickness(A) of the crown center is at least thicker 10% than a thickness(B) of the crown shoulder.

Description

공기압 래이디얼 타이어Pneumatic radial tire

본 발명은 공기압 래이디얼 타이어에 관한 것으로, 특히 단면상에서 벨트가 형성하는 곡률과 트레드부의 곡률을 적정하게 설계함으로써 타이어의 벨트 내구성과 접지형상이 개선된 공기압 래이디얼 타이어에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic radial tire, and more particularly, to a pneumatic radial tire having improved belt durability and a folding shape of a tire by appropriately designing the curvature formed by the belt on the cross section and the curvature of the tread portion.

일반적으로 종래의 공기압 래이디얼 타이어를 설계하는 방법은 인몰드(In-mold)시의 형상과 인프레이트(Inflate)시의 형상의 차이를 최소화하여 벨트 내구성을 확보하기 위해 도 2에 도시된 바와 같이, 타이어 인프레이션시의 평형형상과 거의 유사하게 카카스 프로파일을 설정하고 이를 골격으로 하여 벨트층(10)을 크라운부 카카스(20)의 곡률과 평행하게 배열하며 외곽의 TR(Tread Radius) 또한 벨트층의 곡률과 평행하게 형성시켜왔다.In general, a method of designing a conventional pneumatic radial tire is as shown in Figure 2 to secure the belt durability by minimizing the difference between the shape when in-mold and the shape when inflate (Inflate) Similarly to the equilibrium shape at the time of tire inflation, the carcass profile is set, and as a skeleton, the belt layer 10 is arranged in parallel with the curvature of the crown carcass 20, and the outer TR (Tread Radius) is also used. It was formed in parallel with the curvature of the belt layer.

그런데, 래이디얼 타이어의 편평비가 낮아질수록 타이어 단면 크라운 센터에서 형성되는 카카스(20)의 곡률반경이 점점 커지게 된다. 따라서, 이 곡률과 평행하게 형성된 벨트층(10)의 곡률과 TR 또한 커지게 되고, 이와 같이 저편평비 타이어의 경우는 일반 타이어에 비해 트레드 반경이 커지게 되며, 이로 인하여 저편평비 타이어는 하중작용시의 접지형상에 있어 일반 타이어에 비하여 그 형상이 사각형에 가깝고 초저편평비로 가면 접지길이가 센터부와 숄드부가 역전되는 형상이 발생하여 접지형상이 오목하게 되어 타이어의 내구성이 저하되는 문제점이 있었다.However, as the flat ratio of the radial tire is lowered, the radius of curvature of the carcass 20 formed at the tire cross-sectional crown center becomes larger. Therefore, the curvature and TR of the belt layer 10 formed in parallel with the curvature also become large, and thus, in the case of the low flat tire, the tread radius becomes larger than that of the general tire, and thus, the low flat tire has a load effect. Compared to general tires, when the shape is closer to a square than the normal tire and goes to an ultra-low flat ratio, the shape of the ground length is reversed to the center part and the shoulder part, and the shape of the ground becomes concave, thereby deteriorating the durability of the tire.

이에 본 발명은 상기와 같은 제반 문제점을 해결하기 위해 발명된 것으로서, 크라운 센터에서 카카스와 벨트층이 형성하는 곡률 반경의 값이 무한대, 즉 직선이 되도록 하고, 타이어 반경을 크라운 센터와 숄더부를 각각 다르게 형성시킴으로써 타이어의 벨트 내구성과 접지형상이 개선된 공기압 래이디얼 타이어를 제공함에 그 목적이 있다.Accordingly, the present invention has been invented to solve the above problems, so that the value of the radius of curvature formed by the carcass and the belt layer in the crown center is infinite, that is, straight, and the tire radius is different from the crown center and the shoulder It is an object of the present invention to provide a pneumatic radial tire with improved belt durability and folding shape of the tire.

도 1은 본 발명에 따른, 저편평비 래이디얼 타이어의 단면도,1 is a cross-sectional view of a low flat radial radial tire, according to the present invention;

도 2는 본 발명에 따른, 래이디얼 타이어의 규정하중 작용시의 접지형상도,Fig. 2 is a ground shape diagram at the time of the prescribed load action of the radial tire according to the present invention;

도 3는 종래의 구조로서, 도 1에 대응되는 단면도3 is a conventional structure, a cross-sectional view corresponding to FIG.

도 4는 종래의 기술로서, 도 2에 대응되는 접지형상도이다.FIG. 4 is a ground diagram corresponding to FIG. 2 according to the related art.

1 --- 벨트층, 2 --- 카카스부.1 --- Belt layer, 2 --- Carcass section.

상기와 같은 목적을 달성하기 위한, 본 발명은 70시리즈 이하의 초저편평비 래이디얼 타이어에 있어서 벨트 내구성이 개선되도록 하기 위해서, 크라운 센트부의 곡률반경을 무한대인 직선으로 형성시키되, 직선을 이루는 범위는 타이어 설계 단면폭(SW)의 50 내지는 70%로 한다. 또한 벨트층의 곡률(Rb) 또한 무한대인 직선으로 형성시키되, 직선의 범위는 벨트의 전폭으로 하며, 접지형상의 개선을 위해 타이어 외곽의 트레드부의 곡률반경(TR)은 벨트층의 곡률과 평행하지 않게 형성시키면서, 곡률반경의 값은 단면폭의 약 300 내지는 600%의 범위로 설정한다.In order to achieve the above object, the present invention in order to improve the belt durability in the ultra-low flat ratio radial tire of 70 series or less, the radius of curvature of the crown cent portion is formed in an infinite straight line, the range of forming a straight tire It is set as 50 to 70% of the design cross section width SW. In addition, the curvature Rb of the belt layer is also formed as an infinite straight line, the range of the straight line is the full width of the belt, the radius of curvature TR of the tread portion outside the tire is not parallel to the curvature of the belt layer to improve the ground shape. While not forming, the value of the radius of curvature is set in the range of about 300 to 600% of the cross-sectional width.

따라서, 벨트층이 이루는 곡률과 타이어 외곽 트레드부의 곡률(TR)이 서로 평행하지 않기 때문에, 타이어 단면상에서 크라운 센터부의 트레드 두께와 크라운 숄더부의 트레드 두께가 같지 않게 된다.Therefore, since the curvature formed by the belt layer and the curvature TR of the tire outer tread portion are not parallel to each other, the tread thickness of the crown center portion and the tread thickness of the crown shoulder portion are not equal on the tire cross section.

한편 벨트층이 이루는 곡률반경(Rb)이 무한대이고 트레드부의 곡률(TR)값이 양의 값으로 가지게 되도록 설계함으로 당연히 크라운 센터의 트레드 두께가 크라운 숄더의 트레드 두께보다 커지게 된다.On the other hand, the radius of curvature Rb formed by the belt layer is infinite, and the curvature TR of the tread part is designed to have a positive value, so that the tread thickness of the crown center becomes larger than the tread thickness of the crown shoulder.

이하 본 발명을 첨부한 도면을 참조로 하여 상세하게 설명하기로 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른, 저편평비 래이디얼 타이어의 단면도인 바, 본 발명은 70시리즈 이하의 초저편평비 래이디얼 타이어에 있어서 벨트 내구성이 개선되도록 하기 위해서, 크라운 센트부의 곡률반경을 무한대인 직선으로 형성시키되, 직선을 이루는 범위는 타이어 설계 단면폭(SW)의 50 내지는 70%로 한다. 또한 벨트층(1)의 곡률(Rb) 또한 무한대인 직선으로 형성시키되, 직선의 범위는 벨트의 전폭으로 하며, 접지형상의 개선을 위해 타이어 외곽의 트레드부(2)의 곡률반경(TR)은 벨트층의 곡률과 평행하지 않게 형성시키면서, 곡률반경의 값은 단면폭의 약 300 내지는 600%의 범위로 설정한다.1 is a cross-sectional view of a low flat radial tire according to the present invention. In order to improve belt durability in an ultra low flat radial tire of 70 series or less, the radius of curvature of the crown cent part may be infinitely straight. It is formed, but the range forming a straight line is 50 to 70% of the tire design cross-sectional width (SW). In addition, the curvature Rb of the belt layer 1 is also formed in an infinite straight line, the range of the straight line is the full width of the belt, the radius of curvature TR of the tread portion 2 of the outer tire to improve the ground shape The value of the radius of curvature is set in the range of about 300 to 600% of the cross-sectional width while being formed not parallel to the curvature of the belt layer.

따라서, 벨트층(1)이 이루는 곡률과 타이어 외곽 트레드부(2)의 곡률(TR)이 서로 평행하지 않기 때문에, 타이어 단면상에서 크라운 센터부의 트레드 두께(A)와 크라운 숄더부의 트레드 두께(B)가 같지 않게 된다.Therefore, since the curvature of the belt layer 1 and the curvature TR of the tire outer tread portion 2 are not parallel to each other, the tread thickness A of the crown center portion and the tread thickness B of the crown shoulder portion on the tire cross section. Will not be equal.

한편 벨트층(1)이 이루는 곡률반경(Rb)이 무한대이고 트레드부(2)의 곡률(TR)값이 양의 값으로 가지게 되도록 설계함으로 당연히 크라운 센터의 트레드 두께(A)가 크라운 숄더의 트레드 두께(B)보다 커지게 된다.On the other hand, the radius of curvature Rb formed by the belt layer 1 is infinite and the curvature TR of the tread part 2 is designed to have a positive value, so that the tread thickness A of the crown center is the tread of the crown shoulder. It becomes larger than the thickness (B).

상기와 같이 제작되어진 래이디얼 타이어의 성능을 시험해본 결과, 공기압 작용시와 하중작용시의 벨트 단말부에 걸리는 전단변형값이 현저하게 감소하게 되고, 공기압시와 하중시의 전단변형값의 차이 즉, 전단변형의 진폭도 감소되어짐을 확인할 수 있었고, 규정하중 작용시의 접지형상이 도 2에 도시된 것과 같이, 종래에 타이어의 접지길이가 센터부와 숄드부가 역전되는 형상이 발생하게 되어 접지형상이 오목해지는 부분이 없어지게 된다.As a result of testing the performance of the radial tire manufactured as described above, the shear strain value applied to the belt end portion during the pneumatic action and the load action is remarkably reduced, and the difference between the shear deformation value during the pneumatic and the load is The amplitude of the shear deformation was also reduced, and as shown in FIG. 2, the ground shape at the time of the prescribed load action, the ground length of the tire was inverted so that the center part and the shoulder part were inverted. This recessed portion is eliminated.

이상에서 상세하게 설명한 바와 같이, 본 발명에 의하면 크라운 센터에서 카카스부(2)와 벨트층(1)이 형성하는 곡률 반경의 값이 무한대, 즉 직선이 되도록 하고, 타이어 반경을 크라운 센터와 숄더부를 각각 다르게 형성시킴으로써 공기압 작용시와 하중작용시의 벨트 단말부에 걸리는 전단변형값이 현저하게 감소하게 되고, 공기압시와 하중시의 전단변형값의 차이 즉, 전단변형의 진폭도 감소됨에 따라, 타이어의 벨트 내구성과 접지형상이 개선되는 효과가 있다.As described in detail above, according to the present invention, the value of the radius of curvature formed by the carcass part 2 and the belt layer 1 at the crown center is infinite, that is, a straight line, and the tire radius is the crown center and the shoulder. By forming the parts differently, the shear strain value applied to the belt end portion during the pneumatic action and the load action is remarkably reduced, and the difference between the shear deformation values during the pneumatic and the load, that is, the amplitude of the shear deformation is also reduced. The belt durability and the folding shape of the tire are improved.

Claims (2)

70시리즈 이하의 초저편평비 래이디얼 타이어에 있어서 벨트 내구성이 개선되도록 하기 위해서, 크라운 센트부의 곡률반경을 무한대인 직선으로 형성시키되, 직선을 이루는 범위는 타이어 설계 단면폭(SW)의 50 내지는 70%로 한다. 또한 벨트층(1)의 곡률(Rb) 또한 무한대인 직선으로 형성시키되, 직선의 범위는 벨트의 전폭으로 하며, 접지형상의 개선을 위해 타이어 외곽의 트레드부(2)의 곡률반경(TR)은 벨트층의 곡률과 평행하지 않게 형성시키면서, 곡률반경의 값은 단면폭의 약 300 내지는 600%의 범위로 설정되는 공기압 래이디얼 타이어.In order to improve the durability of the belt in the ultra-low flat ratio radial tire of 70 series or less, the radius of curvature of the crown cent is formed in an infinite straight line, and the range of the straight line is 50 to 70% of the tire design section width (SW). . In addition, the curvature Rb of the belt layer 1 is also formed in an infinite straight line, the range of the straight line is the full width of the belt, the radius of curvature TR of the tread portion 2 of the outer tire to improve the ground shape A pneumatic radial tire which is formed so as not to be parallel to the curvature of the belt layer, wherein the value of the radius of curvature is set in the range of about 300 to 600% of the cross-sectional width. 제 1항에 있어서, 상기 벨트층(1)이 이루는 곡률반경(Rb)이 무한대이고 트레드부(2)의 곡률(TR)값이 양의 값으로 가지게 되도록 설계하여 크라운 센터의 트레드 두께(A)가 크라운 숄더의 트레드 두께(B)보다 최소한 10%로 이상 두꺼워지는 것을 특징으로 하는 공기압 래이디얼 타이어.The tread thickness (A) of the crown center according to claim 1, wherein the radius of curvature Rb of the belt layer 1 is infinite and the curvature TR of the tread portion 2 is positive. Radial tire, characterized in that the thickness is at least 10% thicker than the tread thickness (B) of the crown shoulder.
KR1019980038628A 1998-09-18 1998-09-18 Pneumatic radial tire KR100545889B1 (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
KR100491993B1 (en) * 2002-07-10 2005-05-30 한국타이어 주식회사 Radial tire
CN109501523A (en) * 2018-12-04 2019-03-22 安徽佳通乘用子午线轮胎有限公司 A kind of all-steel radial tyre of high mileage
KR20200038104A (en) 2018-10-02 2020-04-10 허원준 Side Dish Container capable of easily checking the contents therein
CN112622517A (en) * 2020-12-30 2021-04-09 安徽佳通乘用子午线轮胎有限公司 Rail tire design method and rail tire

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JPS59179407A (en) * 1983-03-30 1984-10-12 Yokohama Rubber Co Ltd:The Pneumatic radial tire for motorcycle
JPH03167004A (en) * 1989-11-27 1991-07-18 Yokohama Rubber Co Ltd:The Pneumatic tire
JPH04193603A (en) * 1990-11-28 1992-07-13 Sumitomo Rubber Ind Ltd Radial tire for passenger car
JPH0648109A (en) * 1992-08-04 1994-02-22 Bridgestone Corp Pneumatic radial tire for heavy load
KR200248160Y1 (en) * 1996-05-30 2001-12-17 신형인 Pneumatic tire with improved steering stability

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* Cited by examiner, † Cited by third party
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KR100491993B1 (en) * 2002-07-10 2005-05-30 한국타이어 주식회사 Radial tire
KR20200038104A (en) 2018-10-02 2020-04-10 허원준 Side Dish Container capable of easily checking the contents therein
CN109501523A (en) * 2018-12-04 2019-03-22 安徽佳通乘用子午线轮胎有限公司 A kind of all-steel radial tyre of high mileage
CN109501523B (en) * 2018-12-04 2023-12-01 安徽佳通乘用子午线轮胎有限公司 High mileage all-steel radial tire
CN112622517A (en) * 2020-12-30 2021-04-09 安徽佳通乘用子午线轮胎有限公司 Rail tire design method and rail tire
CN112622517B (en) * 2020-12-30 2022-05-10 安徽佳通乘用子午线轮胎有限公司 Rail tire design method and rail tire

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