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公开(公告)号：JPS61235205A
公开(公告)日：1986-10-20
申请号：JP7811085
申请日：1985-04-12
Applicant: BRIDGESTONE CORP
Inventor： OGAWA HIROSHI , MOTOMURA KENICHI , YAMADA YUKIMASA , MAMATA MAMORU , NIBU HIKARI
Abstract: PURPOSE:To improve the wear life of a tire by forming a number of thin cuts in a prescribed configuration while being extended in the axial direction of the tire in the outermost shoulder rib among a number of ribs partitioned by broad main grooves that are extended in the circumferential direction. CONSTITUTION:In a pneumatic tire in which a tread 1 is divided into at least three ribs 3 and 4 by at least two broad main grooves 2 that are extended in the circumferential direction of the tire, a number of thin cuts 5 extended in the axial direction of the tire are arranged at least in one line on the circumference of the tire in the shoulder rib 3 positioned at the outermost side of the tread 1 among the ribs by setting the outside end 5a almost in the circumferential direction of the tire. The distance (a) between the outside end 5a of each cut 5 contained in this cut row 6 and the outside end 3a of the shoulder rib 3 is set to 2 to 15% of the tread width T, the axial length (b) of the cut 5 is set to 2% or more of the tread width T, and the cut depth (d) is set to 40 to 100% of the depth (e) of the main groove 2.
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公开(公告)号：JPS61122008A
公开(公告)日：1986-06-10
申请号：JP24346284
申请日：1984-11-20
Applicant: Bridgestone Corp
Inventor： KAJIMOTO KATSUHIKO , KUKIMOTO TAKASHI , YAMADA YUKIMASA , OGAWA HIROSHI
CPC classification number: B60C11/00
Abstract: PURPOSE:To reduce the partial wear of a pneumatic radial tire for a heavy load by increasing the curvature of a tread section at the transverse section of the tire in the half of the outside against a car to which the tire is fit as compared with the half of the inside and fitting the tire in the direction where the outward transverse force resulting from the ply stair of a reinforcing cord is generated. CONSTITUTION:For the curvature diameters Ro and Ri of the outside and inside contours in a tread section 1, Ro is set larger than Ri. In addition, the belt 3 of a tire (A) fit to the left side in the advance direction is a stacked cord layer whose cord arrangement is left rise, left rise, right rise, and right rise in the inside to the outside order of the tire and the belt layer 3 of a tire (B) fit to the right is stacked in right rise, right rise, left rise, and left rise, and then each has a ply stair marked by an arrow alpha or beta. As a result of this structure, the ply stairs alpha and beta of the left and right tires face the outside and the straight advance is improved. Besides, the transverse force at turning is offset by the ply stairs alpha and beta. Also, as a result of this structure, the partial wear can be reduced.
Abstract translation: 目的：为了减轻充气子午线轮胎对于重负荷的部分磨损，通过增加轮胎在一半外侧的轮胎横截面处的胎面部分相对于轮胎适合的车辆的曲率 一半的内部，并且在产生由加强帘线的层间楼梯产生的向外的横向力的方向上装配轮胎。 构成：对于胎面部1中的外侧和内侧轮廓的曲率直径Ro和Ri设定为大于Ri。 此外，轮胎（A）的前进方向上的左侧的轮胎（A）的皮带3是绳索排列向上升，左上升，右上升，右侧上升到内侧的层叠绳索层 轮胎（B）和右侧的轮胎（B）的轮胎层3以右上升，右上升，左上升和左上升的方式被堆叠，然后各自具有由箭头α或β标记的层状楼梯。 作为这种结构的结果，左右轮胎的层楼梯面α和β面向外部，并且直线前进提高。 此外，转弯处的横向力被层压楼梯α和β抵消。 此外，作为这种结构的结果，可以减少部分磨损。
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公开(公告)号：JPH05309760A
公开(公告)日：1993-11-22
申请号：JP14330992
申请日：1992-05-08
Applicant: BRIDGESTONE CORP , TOKAI RYOKAKU TETSUDO KK
Inventor： YAMADA YUKIMASA , IGARASHI MOTOHITO
Abstract: PURPOSE:To set a tire at high speed for traveling when it is impossible to levitate between stations by specifying respectively the blow-out temperature of rubber constituting the ouside and the inside of a tread and also specifying respectively values of the 100% modulus values. CONSTITUTION:A tread 31 is composed of an outside section 32 positioned outside the radius direction and brought into contact with the road surface and an inside section 33 positioned inside the radius direction. The blow-out temperature of the outside section 32 is set in the range of 170-200 deg.C, and rubber having 100% modulus value in the range of 20kg/cm to 30kg/cm is used. The wall thickness T on a tire equatorial face E of the outside section 32 is made in the range of 0.3 to 0.8 times of the tread wall thickness N (total wall thickness of the outside section 32 and the inside section 33 on the tire equatorial face E). On the other hand, the rubber having its blow-out temperature of 230 deg.C or over and 100% modulus value more than the 100% modulus value of the outside section 32 is used for the inside section 33. As a result, in the case of landing at super-high speed, only the inside section 33 can remain.
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公开(公告)号：JPH05301503A
公开(公告)日：1993-11-16
申请号：JP13140892
申请日：1992-04-27
Applicant: BRIDGESTONE CORP
Inventor： YAMADA YUKIMASA , YAGAWA KAZUO , HASHIMOTO TAKATSUGU , HACHITANI KAZUO
Abstract: PURPOSE:To provide flame retardancy of a tire even when the tire is brought into contact with a spark or fire in the last stage of wear of a pneumatic tire or in the case of breakage of the tire by using flame retardant organic fiber having an oxygen index within a specific value range, for at least an organic fiber cord in an outermost layer in a tread part. CONSTITUTION:In the last stage of wear of a tire, organic fiber 1 in a tread outermost layer is first exposed. At least for this organic fiber 1 in the outermost layer of a tread part 2, flame retardant fiber having an oxygen index (defined and measured by JIS K 7201, also referred to as O.I.) of 26.0-35.0 is used. Flame retardancy of the organic fiber in not only the outermost layer but also in two layers, three layers and the like toward the inside is preferable. Accordingly, the flame retardancy of the tire can be secured even when the tire is brought into contact with a spark or fire in the last stage of wear of a pneumatic tire or in the case of breakage of the tire.
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公开(公告)号：JPH05213017A
公开(公告)日：1993-08-24
申请号：JP1760792
申请日：1992-02-03
Applicant: BRIDGESTONE CORP
Inventor： YAMADA YUKIMASA , YAGAWA KAZUO , HASHIMOTO TAKATSUGU
Abstract: PURPOSE:To prevent ignition at the contacting part of a tire with a rim without extensively damaging wear and abrasion resistance required for the contacting part of the tire with a rim flange. CONSTITUTION:A pneumatic tire 10 is 13/80R20 in its size, and the reinforcing part of the pneumatic tire 10 has an one-ply radial carcass 14 reinforced by a steel cord mounting in troidal shape on a pair of bead cores 12 and two layers of belts 16 reinforced by a steel cord on the outside in he radial direction of the radial carcass 14, and a stiffener rubber 20 is arranged between a radial carcass body and its turning up part, and moreover a bead reinforcing layer 22 is provided along the outside of the turning up part of the radial carcass 14. The contacting part of the bead part 25 of the pneumatic tire 10 with the rim of a basic rim 26 is provided with a rubber chaffer layer 28 formed of a flame proof rubber component whose oxygen index is within a range from 19.8 to 27.5 to a gauge T being 1.0mm or less.
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Patent Agency Ranking
公开(公告)号：JPH04129804A
公开(公告)日：1992-04-30
申请号：JP25348290
申请日：1990-09-21
Applicant: BRIDGESTONE CORP
Inventor： YAMADA YUKIMASA
Abstract: PURPOSE:To suppress occurrence of chevron cut and prevent peel-off of tread by providing a cord layer which is formed by rubber-coating organic fiber in such a way that the dimension from the surface of tread becomes the predetermined ratio for the dimension in the deepest section of a groove in peripheral direction of tread. CONSTITUTION:A cord layer 30 which is constituted by arranging straight cord 32 consisting of nylon fiber in a layer in parallel and covering it by a coating rubber 34 is provided between the ground contact face of a tread 22 and a belt layer 26 and at a more shallow position than the deepest section of a tread groove 28. At this time, the dimension of distance A from the surface of the tread 22 of the cord layer 30 is set to the range of 0.35 to 0.55 of the depth B in the deepest section of the groove 28. Consequently, it is possible to suppress chevron cut which occurs from the initial stage of tire wear to the intermediate stage of wear.
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公开(公告)号：JPH0399902A
公开(公告)日：1991-04-25
申请号：JP23633489
申请日：1989-09-12
Applicant: BRIDGESTONE CORP
Inventor： YAMADA YUKIMASA
Abstract: PURPOSE:To improve the abrasion resistance of a tread part in a tire to support a car load slowly changing at takeoff and landing by enlarging a gauge dimension of a belt layer at the middle of a direction of a tire width, and partially forming the belt layer into plural narrow belt layers. CONSTITUTION:A linear motor car floats and drives a car body by a magnetic force operating between a super conductive magnet arranged on a side of a car body and a floating coil and a propelling guide coil which are arranged on a side of a guide passage, and supports the car body through a tire 40 at its takeoff and landing. In the tire 40, plural sheets of belts 56 are adjacently provided in a layer-shape on an outside in a radial direction of the tire of a down carcass 44 and along its convex part 54, and belts 58 are also provided in the same layer-shape on an outside in a radial direction of the belt 56. The dimension of the belt 56 in a direction of a tire width is established to be gradually narrower as a measuring position becomes near the inside in the radial direction of the tire. Thus the gauge dimensions H1 of the belt layers 56, 58 becomes larger at the central part in the dimension of the tire width.
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公开(公告)号：JPH05213011A
公开(公告)日：1993-08-24
申请号：JP1760992
申请日：1992-02-03
Applicant: BRIDGESTONE CORP
Inventor： YAMADA YUKIMASA , YAGAWA KAZUO , HASHIMOTO TAKATSUGU
Abstract: PURPOSE:To provide a tread part with a straight groove which can improve the flame resistance of the tread part without lowering wetness resistance. CONSTITUTION:The tread part of a pneumatic tire 10 is provided with at least one straight groove 34 being straight in a peripheral direction. In the straight groove 34, a narrow groove part 36 is provided at one spot on the ground contact face of the tread part in the case of the maximum load corresponding to normal inner pressure charged in the pneumatic tire 10, and the width B of the narrow groove part 36 is set up to be below 30% to the width A of the straight groove 34, namely (0
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公开(公告)号：JPH05213008A
公开(公告)日：1993-08-24
申请号：JP1760892
申请日：1992-02-03
Applicant: BRIDGESTONE CORP
Inventor： YAMADA YUKIMASA , YAGAWA KAZUO , HASHIMOTO TAKATSUGU
Abstract: PURPOSE:To effectively/make a pneumatic tire flameproof by minimizing the quantity of a consumed flameproof rubber component without damaging a requested fundamental characteristics such as the wear and abrasion resistance and heat build-up resistance of a tread. CONSTITUTION:The reinforcing part of a pneumatic tire 10 has an one-ply radial carcass 14 reinforced by a steel cord mounting in troidal shape on a pair of bead cores 12 and two layers of belts 16 reinforced by a steel cord on the outside in the radial direction of the radial carcass 14, and moreover a bead reinforced layer 22 along the outside of the turning up part of the radial carcass 14. The tire has an outer skin rubber part formed of a tread rubber layer 30 and a side rubber layer 32 which lies in a row on both the sides of the tread rubber layer 30 and extends toward a radial inside to a spot near a bead part, and the tread part is provided with a groove 34 continuing in a peripheral direction. The inner peripheral face of the groove 34 is arranged provided with a flame proof rubber component layer L whose oxygen index is within a range from 22.0 to 30.0 to a gauge T being 1.0 mm or less.
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公开(公告)号：JPH04193609A
公开(公告)日：1992-07-13
申请号：JP32504890
申请日：1990-11-27
Applicant: BRIDGESTONE CORP , RAILWAY TECHNICAL RES INST
Inventor： YAMADA YUKIMASA , ODA KAZUHIRO , TAKIZAWA HIDEYUKI
Abstract: PURPOSE:To make it difficult to cause hydroplaining even when a levitation type vehicle is landed on an wet road surface during travelling at ultra-high speed by providing grooves along the periphery of a tire on a tread, and specifying the ratio of opening area of their grooves within a ground-contact surface when the tread is worn to an apparent ground-contact area. CONSTITUTION:In a tire for levitation type vehicle 14, a pair of grooves 38 are formed at regular intervals on the external surfaces of a tread 34 in tire circumferential direction. These grooves 38 are arranged along the periphery of the tire within an area (dimension B) of 45% of a ground-contact width in ground contact width direction relative to the center of the ground-contact width under 100% load. Also, until the external surfaces of the tread 34 of a new part are worn to a remaining depth of 1.6mm, the ratio of opening area of the grooves 38 in their ground-contact area to an apparent ground-contact area under 100% load is set within an area of 0.02 to 0.15. In addition, organic fiber layer 40 is embedded inside the tread 34 as an wear end indication means, and it is exposed over the surfaces of the tread 34 when the tread 34 is worn to the remaining depth of 1.6mm.
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