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公开(公告)号：JPH02198828A
公开(公告)日：1990-08-07
申请号：JP1745889
申请日：1989-01-30
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , KADOTA KUNINOBU
Abstract: PURPOSE:To simplify an right positioning of a piling position of a fold layer and ensuring of a specified width thereof and to improve processability by adhering and winding a peeling piece at a specified position of the inside layer of a belt laminated in advance on a belt-forming drum before laminating the fold layer. CONSTITUTION:A lamination of a cord strip forming an inside layer 2a of a belt 2 is at first performed on a belt forming drum and after lamination and enveloping of an inner enveloping layer 2e, both side fringes 6 and 6' are folded back and a relayed layer 7 is provided. Then, after peeling pieces 10 and 10' which may be made of each a polyethylene sheet are wound from a position where a fold layer 2b is to be piled to both ends, a cord strip 2b' with a wide width for constituting the fold layer 2b and a necessary inner enveloping layer 2e are successively piled up. After stitchering is performed, both face fringes 6 and 6' are folded back and stitching is performed again and piling up of the fold layer 2b is completed and the releasing pieces 10 and 10' are removed.
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公开(公告)号：JPH02106410A
公开(公告)日：1990-04-18
申请号：JP25887688
申请日：1988-10-14
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , KADOTA KUNINOBU
Abstract: PURPOSE:To effectively prevent rubber form cracking resulting fro side force by a plurality of shallow grooves continuous to all the circumference of a buttress region with a specified depth and distance in the specified buttress region. CONSTITUTION:A carcass 1 substantially being in the form of cord arrangement inside the radial face and a belt 2 being in the form of cord arrangement surrounding a crown are disposed as the support and reinforcing means for a rubber outer cover 3 of a side part along the outside of the carcass 1 and a rubber outer cover 4 of a round shoulder tread part continuous to the surface of the cover 3. In this case, a plurality of shallow grooves 8 continuous to the whole circumference of a buttress region 7 over wider area than the thickness (t) of end of belt measured in the radial direction of tire with distances of 3 - 10mm as well as thicknesses of 0.5 - 1.5mm, in the buttress region outside of a tread end 6 being brought into contact with the ground where a wound shoulder tread rubber outer cover 2 is brought into contact with the surface of road in a normal load posture under normal internal pressure. It is thus possible to restrain the rubber from cracking in the buttress region 7.
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公开(公告)号：JPH02106409A
公开(公告)日：1990-04-18
申请号：JP25888288
申请日：1988-10-14
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , KADOTA KUNINOBU
Abstract: PURPOSE:To improve warkability and to prevent generation of rigidity difference in the start end and final end of wound roll by providing a multi-cord layer to be wound closely in at least one layer of belt, forming the multi-cord of ribbon composed of respective small bundles being arranged all together. CONSTITUTION:A belt 2 is composed of two sets of fold layers 2a and two sheets of separation layers 2b which layers 2a, 2b are superposed sequentially. Two sheets of separation layers 2c are included inside each of the fold layers 2a, while an additional wound layer 5 is interposed between the fold layers 2a. In this case, the layer 5 is wound in a close roll by using a ribbon-like cord strip which is formed of two small bundles b1, b2 composed of two sets spaced with a step S of at least 50mm at both start and final ends of the roll and arranged all together, and which is coated with rubber. It is thus possible to improve workability as well as to prevent generation of rigidity difference in both the start and final end of the layer 5.
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公开(公告)号：JPS63284005A
公开(公告)日：1988-11-21
申请号：JP11815787
申请日：1987-05-15
Applicant: BRIDGESTONE CORP
Inventor： GENKON KATSUYUKI , YAMADA SHIGEKI
IPC: B60C9/08
Abstract: PURPOSE:To reduce distortion or the like of cords in an inner carcass layer so as to aim at elongation of fatigue lifetime by forming a carcass layer in two inner/outer layers, deviating the respective cords of two inner/outer layers by a specified pitch from each other, and arranging inward a circumscribed surface in contact with the outside of the cords in the inner layer. CONSTITUTION:A radial tire 11 used for an aircraft or the like is provided with a pair of ring-like beads 12, two carcass layers 13 which are disposed across the respective beads and folded over outward, and the like. And then, the carcass layer 13 is provided with cords 18 which are disposed in parallel with the tire shaft direction and are covered with a rubber 17. In this case, the carcass layer 13 is formed with inner/outer carcass layers 13A, 13B, respectively. And then, the respective cords 18A, 18B of the inner/outer carcass layers 13A, 13B are arranged with a pitch deviation (1/2)P from each other. In addition, a circumscribed surface M in contact with the outside of the inner carcass layer 13A is arranged inward by a predetermined distance (h) from an inscribed surface N in contact with the inside of the outer carcass layer 13B.
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公开(公告)号：JPH0316805A
公开(公告)日：1991-01-24
申请号：JP15167189
申请日：1989-06-14
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI
Abstract: PURPOSE:To minimize the bad influence at the time of cord breakage by constituting belts so that cross belts are arranged in the outermost layer and that circumferential belts are arranged on the inner side, and by laminating inclined cords so as to be crossed, and also by providing a protective layer in which the circumferential rigidity is set to be less than that of the outermost layer cross belts. CONSTITUTION:Belts 26 consisting of cords having an angle near to the circumferential direction of a tire are arranged so that the neighboring ones are crossed to each other. And, a protective layer 30 is embedded between the bottoms of grooves 28 of tread parts 22 and the uppermost layer of the belt 26. The protective layer 30 is constituted by arranging industrial fiber cords such as a pair of nylon cords, which have been inclined in an angle of 15 deg. to 70 deg. to the circumferential direction so as to be crossed to each other, along the width direction of the tire 10, and by coating them with a rubber layer. Further, a cushion rubber having a thickness of at least 1.1mm is embedded between the outermost layer of the belts 26 and the protective layer 30. By this constitution, the bad influence to be exerted on the cords at the time of cord breakage can be restrained to a minimum.
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Patent Agency Ranking
公开(公告)号：JPH02200423A
公开(公告)日：1990-08-08
申请号：JP1745989
申请日：1989-01-30
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , KADOTA KUNINOBU
IPC: B29D30/36
Abstract: PURPOSE:To fundamentally remove the damage caused by the generation of wrinkles on the outer surface of a bead part by smoothly and stably guiding the rising revolution of the bead part at the time of the troidal deformation of a green case at the initial period of a green tire making stage. CONSTITUTION:A green case 1 is set on a making drum consisting of bladder 2 whose body diameter is expansible and a pair of former rings 3 movable so as to approach the bladder 2 and to be spaced apart therefrom in a state holding said bladder 2 therebetween and the interval between the former rings is contracted while the bladder 2 is expanded to subject the green case 1 to troidal deformation but, especially, a cable bead is used with respect to a bead core 4. This cable bead is composed of an annular spiral bundle wherein sheath wires 4b, 4c, 4d, 4e are respectively wound, for example, 11, 17, 23 and 29 times around an annular core strand 4a over the first-fourth layers along rough spirals in succession and both ends of the respective wires are abutted. The bind wire 5 of the spiral bundle can be detached after the whole of the cable bead is coated with rubber or may be left as it is.
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公开(公告)号：JPH02198829A
公开(公告)日：1990-08-07
申请号：JP1745789
申请日：1989-01-30
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , KADOTA KUNINOBU
Abstract: PURPOSE:To eliminate the decrease in productivity and to prevent a cord bundle from occurrence of waving caused by tolerance of winding diameter by performing simultaneously arranging in parallel and flatly bundling several pieces of heat shrinkable org. fiber cords and winding them spirally on a belt forming drum or a preformed under-belt layer on the drum. CONSTITUTION:When a parallel cord strip 8 prepd. by arranging in parallel e.g. four org. fiber cord, bundling flatly them and coating them with a rubber coating is wound on a belt forming drum which is strongly curved on both sides, by using a heat shrinkable org. fiber cord which as e.g. a nylon 66 cord, is a material with a heat-shrinkage of about 4-12% at vulcanization temp. of a tire before vulcanization and after dipping treatment. A vulcanization molding without occurrence of waving on both ends of a spirally arranged cord layer 5 is realized by a heat shrinkage generated when a green tire wherein a tread rubber ring consisting of a belt laminate 2 and a tread rubber 3 is combined with a green case is vulcanization-molded in a tire mold.
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公开(公告)号：JPH02171303A
公开(公告)日：1990-07-03
申请号：JP32562288
申请日：1988-12-23
Applicant: BRIDGESTONE CORP
Inventor： KADOTA KUNINOBU , YAMADA SHIGEKI
Abstract: PURPOSE:To prevent belt and separation by folding both ends in lateral direction of at least one layer of accumulated inserted belt plies toward the center in lateral direction, duplicating at the center, and separating at least one layer of folded belt plies at the center in lateral direction. CONSTITUTION:A belt layer 13 is constructed together with the innermost intersected belt ply 16. The both ends in lateral direction of an intersected belt ply 16a, an intersected belt ply 16b at 6th position from the innermost side, and the other intersection belt plies 16a and 16b are folded toward the center C in lateral direction. The folded portions A and B are duplicated on the intersected belt plies 16a and 16b at the center C in lateral direction, and the other intersected belt plies 16 are enclosed in these belt plies. In addition, the intersected belt ply 16a is separated at the equator 6 of a tire in lateral direction. With this constitution, belt end separation can be prevented by suppressing the cord-to-cord distance from becoming narrow.
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公开(公告)号：JPH02137917A
公开(公告)日：1990-05-28
申请号：JP29227188
申请日：1988-11-21
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , KADOTA KUNINOBU
Abstract: PURPOSE:To improve durability of a bead part by avoiding interference between a turnup ply and turndown ply, by a method wherein a rubber sheet to be used for squeegee rubber is stuck to a rubbered code strip so that the rubber sheet holds a fixed position of a carcass ply beforehand in a creating stage of a case band. CONSTITUTION:At the time of molding of a green case of a pneumatic tire provided with an up-and-down type radial structural carcass as reinforcement of a body, a rubbered code strip appropriated for a turnup ply 1a of the carcass 1 in a creating process of a case band is wound round a case band creating drum. In this instance, a rubber sheet which is to become squeegee rubber 7 is stuck to the ply extending to inward and outward of the same centering around a position becoming to face on a turnup end 1c of the ply or kept joined beforehand for uniting at the time of joining of the rubbered code strip. Then the rubbered code strip 9 appropriating for a turndown ply 1b is wound around the same by piling the rubbered code strip 9 upon the same for sticking together. The rubber sheet 10, which is to become the squeegee rubber, is treated by joining and uniting at the time of joining of the rubbered code strip 9.
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公开(公告)号：JPH02106331A
公开(公告)日：1990-04-18
申请号：JP25888188
申请日：1988-10-14
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , KADOTA KUNINOBU
IPC: B29D30/42
Abstract: PURPOSE:To improve the separation resistance and pressure resistance performance of a carcass ply by applying a rubber sealing sheet of the same type as that of covering rubber of a cord stripe onto a butt connecting seam, then stitching them, and maintaining a well-balanced cord array of the stripe. CONSTITUTION:When a rubber-coating stripe to be filled in a carcass ply is sequentially wound to be laminated around a case band forming drum 1 in response to the type of the ply, a sealing sheet 3 made of rubber of the same type as that of the coating rubber of the cord stripe is applied onto the butt connecting seam 4 of the starting end and finishing end of windings of the stripe occupying at least the innermost side and/or outermost side of the carcass, and then stitched. Thus, the cord array of the stripe including the seam 4 is kept well-balanced through the steps of molding a green case and a green tire as well as shaping and vulcanizing subsequent to the formation of a case band 2.
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