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1. 发明专利

JPH0717206A PNEUMATIC RADIAL TIRE 失效
公开(公告)号：JPH0717206A
公开(公告)日：1995-01-20
申请号：JP16550593
申请日：1993-07-05
申请人： BRIDGESTONE CORP
发明人： KADOTA KUNINOBU , KOSEKI HIROYUKI
IPC分类号： B60C3/00
摘要： PURPOSE:To provide a new tire structure which avoids separation to be caused in the vicinity of a hoop material and can prevent the development of outer damage toward the hoop material in the case of a tire provided with the hoop material on the tire diametric inside of an annular recessed portion. CONSTITUTION:The tire possesses a section which contains the rotary axis of the tire at which an annular recessed portion 6 made up by winding peripherally a hoop material 3 to reduce partially the diameter of the crown portion of a carcass 1 and depressing a tread surface portion which confronts the above hoop material toward the inside of a tire diametrical direction is provided along a tread peripheral line. As for the contour line of the carcass 1 divided into two mountains by the tightening of the hoop material 3, each mountain is made to be a crown portion, and when a single tire containing this crown portion and existing side walls is each imagined, the carcass contour lines of respective imagined tires that adjoin mutually with the annular recessed portion 6 interposed, become shapes that intersect mutually or come into contact with each other on the tire diametrical inside of the annular recessed portion 6, and the thickness (h) of rubber that is embedded between the bottom surface of the annular recessed portion 6 and the hoop material 3, is made thicker than the thickness (t) of tread rubber on the tire diametrical outside of a belt layer.

2. 发明专利

JPH06286405A PENEUMATIC RADIAL TIRE 失效
公开(公告)号：JPH06286405A
公开(公告)日：1994-10-11
申请号：JP7573093
申请日：1993-04-01
申请人： BRIDGESTONE CORP
发明人： KADOTA KUNINOBU , KOSEKI HIROYUKI
IPC分类号： B60C3/00 , B60C9/18
摘要： PURPOSE:To enable adaptation to a heavy load tire, particularly to this kind of tire in a pneumatic radial tire which has a deep and wide annular recessed part almost in the central part of a tread surface and has excellent drainage performance. CONSTITUTION:A hoop material 3 to reduce partially a diameter of a crown part of a carcass 1 of a tire is wound in the circumferential direction, and belt layer 4a and 4b are arranged on the outside in the tire diameter direction of the carcass, and a tread 5 is arranged next, and an annular recessed part 6 formed by recessing a part corresponding to the hoop material of a tread surface to the inside in the tire diameter direction is arranged along a peripheral line of the tread, and the hoop material is composed of a fiber cord of polypara phenylene benzo bistiazole or polypara phenylene benzo bisoxazole having strength of not less than 30g/d.

3. 发明专利

JPH04297307A COMBINATED STRUCTURE OF HEAVY DUTY RADIAL TIRE FOR USE IN WINTER 失效
公开(公告)号：JPH04297307A
公开(公告)日：1992-10-21
申请号：JP8458291
申请日：1991-03-26
申请人： BRIDGESTONE CORP
发明人： ICHIKI YASUBUMI , AOKI NAMIHITO , MATSUMOTO HIROYUKI , KOSEKI HIROYUKI
IPC分类号： B60C5/00 , B60C20060101 , B60C11/00 , B60C11/03 , B60C11/11 , B60C11/12
摘要： PURPOSE:To improve the travelling performance on ice in a heavy duty radial tire having plural block rows each of which consists of blocks provided with siping by specifying respective negative ratios of a tire mounted on a non-driving shaft and a tire mounted on a driving shaft, and setting the negative ratio of the tire mounted on the non-driving shaft smaller. CONSTITUTION:Block rows 1-4 consisting of locks 1a-4a are formed on the tread, and the respective blocks 1a-4a are provided with sipings 5-8. The negative ratio NF of a tire mounted on a non-driving shaft is set as: 0.18

4. 发明专利

JPH04201608A PNEUMATIC TIRE EXCELLENT IN RUNNING PERFORMANCE ON FROZEN AND WET GROUND SURFACE 失效
公开(公告)号：JPH04201608A
公开(公告)日：1992-07-22
申请号：JP33060390
申请日：1990-11-30
申请人： BRIDGESTONE CORP
发明人： MATSUMOTO HIROYUKI , KOSEKI HIROYUKI
IPC分类号： B60C11/11 , B60C11/12
摘要： PURPOSE:To improve running performance on the surface of frozen and wet road in a studless tire by driving a land section which consists of main grooves and auxiliary grooves into narrow width land sections and wide width land sections which are narrow grooves and each of which has a predetermined thickness, specifying them as a bend deformation region and a shear deformation region respectively, and specifying the average thickness of the land sections which are orthogonal to the narrow grooves. CONSTITUTION:A tire tread face 1 consists of main grooves 2 and auxiliary grooves 3 to form land section divisions 4. A narrow width land section 6 and a wide width land section 7 are formed by a narrow groove 5 in each land section division 4. At this time, the wall thickness TS of the narrow width land section 6 is set to 0.1 to 0.5 times depth (h) of the narrow groove 5 to form a bend deformation region. Also, thickness T of the wide width land section 7 is set to 0.78 to 2.0 times depth (h) of the narrow groove 5 to form a shear deformation region. Also, average thickness TL of the land section division 4 which is orthogonal to the narrow groove 5 at the bottom of a mutually divided groove 3 is set to 1.5 times thickness from the bottom of the narrow groove 5 to the bottom of the mutually divided groove 3.

5. 发明专利

JPH0427606A BEAD PART STRUCTURE OF PNEUMATIC TIRE 失效
公开(公告)号：JPH0427606A
公开(公告)日：1992-01-30
申请号：JP13331390
申请日：1990-05-23
申请人： BRIDGESTONE CORP
发明人： KOBAYASHI YASUHIKO , KOSEKI HIROYUKI
IPC分类号： B60C15/00 , B60C15/06
摘要： PURPOSE:To prevent separation of a reinforcing ply by dividing a stiffener into inner and outer stiffener parts which are positioned on an inner side and an outer side in a radial direction by a particular border surface, constituting the inner and outer stiffener parts from rubber with a particular shore A hardness, and specifying the volume ratio of the outer stiffener to the whole stiffener. CONSTITUTION:The inner edge part in a radial direction of a stiffener 20 is disposed between a body part 5 and an outer ply 10, and comes into contact with a bead 2. With this constitution, the stiffener 20 is divided into an inner stiffener part 21 positioned on its inner side in a radial direction with regard to a border surface X which connects smoothly a position F on an outer side surface in an axial direction of the stiffener 20 and a position G on an inner side surface in an axial direction, and an outer stiffener part 22 positioned on its outer side in a radial direction with regard to the border surface X. Besides, the inner side stiffener part 21 is constituted from rubber with shore A hardness 58-68 degree, and the outer side stiffener part 22 is constituted from rubber with shore A hardness at 55 degree or less, which is apt to deform. Moreover, the volume ratio of the outer stiffener part 22 to the whole stiffener 20 is set at 10% or more.

6. 发明专利

JPH03186409A PNEUMATIC TIRE 失效
公开(公告)号：JPH03186409A
公开(公告)日：1991-08-14
申请号：JP32549389
申请日：1989-12-15
申请人： BRIDGESTONE CORP
发明人： KOBAYASHI YASUHIKO , KOSEKI HIROYUKI
IPC分类号： B60C13/00 , B60C13/02 , B60C15/00 , B60C15/024
摘要： PURPOSE:To prevent an outer side ply from its separation by forming a hollow in a specific location of a tire external surface and, making a specific curve extending in parallel to the main unit part of a carcass ply, to cross with the hollow and also specifying a distance, from an outer side ply to the hollow. CONSTITUTION:The carcass ply 4 of a carcass layer 3 in a tire 1 is composed of a main unit part 5 positioned inside the axial direction of a bead 2 and a foldback part 6 serving as an outer side ply positioned outside the axial direction of the head 2. In this case, a hollow 20 is formed in a tire external surface 18 between a radial direction outer end 17 of the foldback part 6 and a tire maximum width position. A curve B, extending in parallel to the main unit part 5 toward the tire maximum width position from the radial direction outer end 17, is made to cross the hollow 20. Furthermore, a distance C on the curve B, from the radial direction outer end 17 to a hollow side wall 21 on the side approaching this radial direction outer end 17, is set to 2.5 or less times the minimum distance A from the radial direction outer end 17 to the main unit part 5.

7. 发明专利

JPH0234408A STRUCTURE OF TIRE TREAD 失效
公开(公告)号：JPH0234408A
公开(公告)日：1990-02-05
申请号：JP18662188
申请日：1988-07-26
申请人： BRIDGESTONE CORP
发明人： MATSUMOTO HIROYUKI , TANABE CHISHIRO , KOSEKI HIROYUKI
IPC分类号： B60C11/11 , B60C11/03
摘要： PURPOSE:To enhance the tracting performance especially in muddy place by giving a specific relationship between the front and rear edge position in the rotating direction and the length along the axis to a fore and an aft block forming the tread structure of a tire. CONSTITUTION:Groups 23, 24 of fore and aft blocks are provided in the tread part 22 of a tire 21 and arranged alternately in the circumferential direction a distance L apart from each other. Each block 23, 24 consists of fore and aft blocks 25, 27 a distance M apart from each other in the axial direction of the tire 21 in linear symmetricity about the equator 26 of the tire. The front edges 28, 29 of the blocks 25, 27 are extended in parallel with the axis of tire 21. The axial direction length A of rear edges 30, 31 shall alike be made shorter than the axial direction length B of the front edges 28, 29. The front edges 28, 29 are arranged between the fore and aft edges 28, 29, 30, 31 of blocks 25, 27 situated immediately before.

8. 发明专利

JPH01285410A HEAVY LOAD PNEUMATIC RADIAL TIRE 失效
公开(公告)号：JPH01285410A
公开(公告)日：1989-11-16
申请号：JP11493688
申请日：1988-05-13
申请人： BRIDGESTONE CORP
发明人： KONO YOSHIHIDE , KOSEKI HIROYUKI , TANABE CHISHIRO
IPC分类号： B60C15/06 , B60C15/00
摘要： PURPOSE:To improve the durability of a bead portion by disposing a turn-up ply in a designated region from an rim flange to the tread side and a turn-up portion substantially parallel at a designated space therebetween when a tire is installed on a normal rim and normal internal pressure is charged therein. CONSTITUTION:In the radial section of a tire which is installed on a normal rim and is charged with normal internal pressure, a turn-up ply of a carcass 1 and a turn-up portion 2 in a region clamped by a tangent (m) drawn from a rim flange 5 parallel to the rotating shaft of the tire and a line (n) drawn parallel at a position distant from the line (m) by 2/3 times the height of the rim flange are disposed in such a manner as to be substantially d1$1 d2, and the space between the ply and the turn-up portion 2 is set within 0.60 times as long as the diameter l of a bead core 4. By this arrangement, separation between rubber of the bead core portion and a cord can be prevented so as to improve durability.

9. 发明专利

JPH01122703A PNEUMATIC TIRE 失效
公开(公告)号：JPH01122703A
公开(公告)日：1989-05-16
申请号：JP28081387
申请日：1987-11-06
申请人： BRIDGESTONE CORP
发明人： KOSEKI HIROYUKI , KOBAYASHI YASUHIKO
IPC分类号： B60C9/18 , B60C9/22
摘要： PURPOSE:To prevent both separation of a belt end of a tire and uneven abrasion thereof by disposing a reinforcing layer between a belt ply and a carcass layer, and by arranging both widthwise outer ends of a reinforcing layer widthwise inward from specific points within the width of a tread. CONSTITUTION:A tire is composed of a carcass layer 2, a tread 7 arranged radially outward from the carcass layer 2 and a belt layer 8 disposed between the carcass layer 2 and tread 7. In this arrangement, a reinforcing layer 11 composed of less than two layers of reinforcing plies 12 which are embedded therein with cords laid substantially in parallel with the equator of the tire, are arranged between a belt ply 9c located at the radially outermost side of the belt layer 8 and the carcass layer 2. Further, the widthwise outer ends 14, 15 of each reinforcing ply 12 are arranged widthwise inward from points 18, 19 which are spaced respectively from both shoulder ends 16, 17 of the tire by one-fifth of the tire tread width W.

10. 发明专利

JPH01122702A PNEUMATIC RADIAL TIRE 失效
公开(公告)号：JPH01122702A
公开(公告)日：1989-05-16
申请号：JP28081287
申请日：1987-11-06
申请人： BRIDGESTONE CORP
发明人： KUKIMOTO TAKASHI , KOSEKI HIROYUKI
IPC分类号： B60C11/12 , B60C9/18 , B60C9/22 , B60C11/04
摘要： PURPOSE:To surely prevent both separation of a belt end of a tire and uneven wear thereof by specifying widthwise positions of both outer ends of a reinforcing ply, and forming lateral side grooves in a pair of right and left side ribs. CONSTITUTION:A tire 1 is composed of a carcass layer 2, a tread 7, a belt layer 10 and a reinforcing layer 13. Several main grooves 8a through 8d are formed in the outer periphery of the tread 7 so that a center rib 9a and a pair of side ribs 9 are formed. In this arrangement, both widthwise outer ends 17, 18 of at least a layer of a reinforcing ply 14 forming a reinforcing layer are located widthwise inward from the widthwise outermost ends 19, 20 of the main grooves 8a, 8c. Further, several lateral grooves (not shown) are formed in each side rib 9b, being circumferentially spaced from each other and being opened to the main grooves 8a through 8d.

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