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51. 发明专利

JPH0495505A RADIAL TIRE 失效
公开(公告)号：JPH0495505A
公开(公告)日：1992-03-27
申请号：JP21019990
申请日：1990-08-10
申请人： BRIDGESTONE CORP
发明人： MIYAZONO TOSHIYA , KONO YOSHIHIDE , KOSEKI HIROYUKI
IPC分类号： B60C9/20 , B29D30/38 , B29K105/22
摘要： PURPOSE:To prevent degradation in durability of a tire due to the growth and development of cracks by dividing reinforcing elements in a rubber sheathed layer into bundles, each of which consists of several reinforcing elements, and enlarging the distribution spacing between the bundle and an adjacent reinforcing element. CONSTITUTION:The belt 2 of a radial tire 1 is generally used as a rubber- sheathed layer in which reinforcing elements made of steel monofilaments 3 arranged in parallel and diagonally to the equatorial face of the tire, are buried. In this case, with the above belt 2, in a conventional example shown in the upper column (a) in Figure, the arrangement of the steel monofilaments 3 in the rubber-sheathed layer is set for the monofilaments to be equally (s) spaced. Conversely, in an embodiment shown in the lower column (b), the steel monofilaments 3 are divided into bundles, each of which consists of several monofilaments and which are arranged at wider distribution spacing delta. Thus, the growth of cracks between adjacent reinforcing elements 3 located the distribution spacing delta apart is delayed depending on the distribution spacing delta, and thereby the enlargement of cracks capable of rapidly inducing belt-separation between laminated layers of the belt 2 can be effectively restricted.

52. 发明专利

JPH02279403A PNEUMATIC RADIAL TIRE 失效
公开(公告)号：JPH02279403A
公开(公告)日：1990-11-15
申请号：JP9919489
申请日：1989-04-19
申请人： BRIDGESTONE CORP
发明人： NAKAGAWA EIKO , KOSEKI HIROYUKI
IPC分类号： B60C15/00 , B60C15/06
摘要： PURPOSE:To reduce heat and strains at the top part of a carcass to improve the durability of a bead part by arranging a hard rubber sheet so as to overlap up to above a folded end part of the carcass, and arranging a surface layer rubber outside the hard rubber sheet in the direction of rotary shaft. CONSTITUTION:The lengthwise extending outer peripheral surface of a carcass ply cord 26 is covered with a ply coating rubber 28. A hard rubber sheet 29 is arranged on the outside of a folded end part 10A of a carcass in the direction of rotary shaft. Further, the portion surrounded by the folded end part 10A, the hard rubber sheet 29, and a steel cord 14 is filled with a soft rubber 30. In this case, the hard rubber sheet 29 is arranged so as to overlap up to above the cut section of the carcass. The difference between the rigidity of the carcass ply cord 26 and the rigidity of the soft rubber 30 near the cut section of the carcass is thus reduced, and thereby local concentration of strains can be eliminated.

53. 发明专利

JPH02246810A PNEUMATIC TIRE WITH BLOCKS DIVIDED BY SIPE 失效
公开(公告)号：JPH02246810A
公开(公告)日：1990-10-02
申请号：JP6641189
申请日：1989-03-20
申请人： BRIDGESTONE CORP
发明人： MATSUMOTO HIROYUKI , KOSEKI HIROYUKI
IPC分类号： B60C11/11 , B60C11/12
摘要： PURPOSE:To permit the initial rigidity of a block to be kept up to a running end in the above-mentioned tire for a snow or ice covered road by forming a sipe between opposite sides along a tread cross direction and setting the length of a cross path along a groove bottom to be longer than that in a block surface. CONSTITUTION:A land portion 2 which is formed by partitioning a tread with a groove portion 1 is divided with a sipe (S) which is formed along a tread cross direction to form a block 3. The length (l) of the cross path of the sipe (S) along a groove bottom S1 is set to be longer than the length l1 of the cross path of the sipe (S) in the surface of the block 3. Such constitution permits thawed-water discharging ability to be improved on an iced road and initial rigidity to be maintained up to a running end, because the length of the cross path is gradually increased with tread wear to offset the increase of block rigidity with the wear.

54. 发明专利

JPH02141306A PNEUMATIC TIRE 失效
公开(公告)号：JPH02141306A
公开(公告)日：1990-05-30
申请号：JP29227488
申请日：1988-11-21
申请人： BRIDGESTONE CORP
发明人： KONO YOSHIHIDE , KOSEKI HIROYUKI
IPC分类号： B60C9/18 , B60C9/20 , B60C9/26
摘要： PURPOSE:To effectively improve the durability of a belt in a folding structure belt having a reinforced tread by arranging reinforcing elements to form the strips of the belt so that each folded back layers of the reinforcing elements may mutually intersect with divergence of a half pitch. CONSTITUTION:A tire 1 is provided with a toroidal carcass 2 to reinforce a body and a folding structure belt 4 surrounding the crown of the carcass 2 in a rubber part of a tread 3 to reinforce the tread. The belt 4 is formed of strips made of many cords which are oriented in a wave form to serve as a reinforcing element 7 and coated with rubber having low modulus of elasticity. In this case, each layer of the reinforcing element 7 in the folded back portion 6 of the belt 4 is arranged to mutually intersect with divergence of an about half pitch. Thus the separation of the belt 4 can be prevented to improve its durability without damaging its cornering characteristics.

55. 发明专利

JPH0281706A PNEUMATIC TIRE FOR HEAVY LOAD 失效
公开(公告)号：JPH0281706A
公开(公告)日：1990-03-22
申请号：JP23225288
申请日：1988-09-19
申请人： BRIDGESTONE CORP
发明人： KONO YOSHIHIDE , KOSEKI HIROYUKI
IPC分类号： B60C9/18 , B60C3/02 , B60C9/20 , B60C9/22
摘要： PURPOSE:To improve maneuverability and durability by providing a first strip using reinforcing elements to be in orientation in the direction along the equator of a tire and a second strip using reinforcing elements to be in parallel arrangement to each other at a specified angle of inclination to the equatorial plane of the tire. CONSTITUTION:A first strip 2 using reinforcing elements in corrugated form functions as a circular rigidity means, and a second strip 3 bears only a role as a shearing rigidity means in the axial direction of the tire. It is possible to improve a belt with no need for using an additional reinforcing layer jointly and yet so as to be possible to satisfy performance needed for the belt profitably with that reinforcing elements 7 for the second strip 3 formed in two layers are arranged in parallel to each other at an angle of inclination in a range of 30-60 deg. to the equatorial plane of the tire, and the first and the second stripes 2, 3 form a stratified structure for functioning as the belt contributing to strengthen the crown of a tread-like carcass 4.

56. 发明专利

JPH0231903A PNEUMATIC RADIAL TIRE HAVING HIGH DURABILITY IN BEAD PORTION 失效
公开(公告)号：JPH0231903A
公开(公告)日：1990-02-01
申请号：JP18029288
申请日：1988-07-21
申请人： BRIDGESTONE CORP
发明人： IIDA HIROYUKI , KOSEKI HIROYUKI
IPC分类号： B60C15/00 , B60C3/04 , B60C9/08 , B60C15/06
摘要： PURPOSE:To enable secureness of durability in a bead portion required for elongation of regenerative lifetime of a heavy loaded radial tire by constituting a carcass profile in such a way as to generate a compressive stress in the bead portion near the winding-up end of a ply together with deformation of a carcass with a standard inner pressure filled. CONSTITUTION:The curvature varying region (upsilon) of a carcass passline bypasses toward the winding-up portion of a ply at a self-standing attitude filled with 5% of a standard inner pressure under an unloaded condition with rims braided. Under such a condition that the standard inner pressure is filled as shown by a dashed line, the passline of a carcass 4 deforms smoothly and continuously together with the expansion deformation of a tire on the basis of the inner pressure so that a compressive stress is generated inside a bead portion 1 near the winding-up end of the ply, thereby decreasing tensile strain. The compressive stress reduces the tensile strain under the unloaded condition with the inner pressure filled so as to bring about effective reduction of the tensile strain in the winding-up end of the ply in the bead portion at the time of traveling of the tire, thus suitably avoiding any trouble in the bead portion.

57. 发明专利

JPH01297306A PNEUMATIC RADIAL TYRE FOR HEAVY LOAD 失效
公开(公告)号：JPH01297306A
公开(公告)日：1989-11-30
申请号：JP12713388
申请日：1988-05-26
申请人： BRIDGESTONE CORP
发明人： KONO YOSHIHIDE , KOSEKI HIROYUKI , TANABE CHISHIRO
IPC分类号： B60C13/00 , B60C9/08 , B60C9/09 , B60C15/06
摘要： PURPOSE:To enhance the rigidity of the sidewall portion of a tyre by disposing a reinforcing layer formed by the lamination of two organic fiber cord layers in mutually intersected relationship inside a carcass ply which goes from the shoulder portion to the bead portion via the sidewall portion of the tyre. CONSTITUTION:A tyre is provided with a carcass 1 formed by turning one piece of turn-up ply from the inside back to the outside in the circumference of a bead core 5 and a belt layer 2 formed by the lamination of plural cord layers of steel cord in mutually intersected relationship. In this case, two pieces of putty formed of organic fiber cord are laminated to each other in such a manner that their respective cords may intersect with each other so as to form a reinforcing layer 3. And the reinforcing layer 3 is disposed along the inner side of the carcass 1 from the shoulder portion including the end of the belt layer 2 to the area in the bead portion where the turn-up portion of the carcass ply is located via the sidewall portion of the tyre. The rigidity of the sidewall portion is thus surely and simply enhanced.

58. 发明专利

JPS6428005A FLAT PNEUMATIC RADIAL TIRE FOR HEAVY LOAD 失效
公开(公告)号：JPS6428005A
公开(公告)日：1989-01-30
申请号：JP7825988
申请日：1988-04-01
申请人： BRIDGESTONE CORP
发明人： KOSEKI HIROYUKI
IPC分类号： B60C3/04 , B60C9/08 , B60C15/06
摘要： PURPOSE:To reduce stress shared by a belt layer so as to enhance the durability of a belt portion by forming a carcass line installed in a normal rim in the cross section of the radial directions at the time of filling up normal internal pressure to satisfy a specific dimension relation. CONSTITUTION:It is respectively presumed that a maximum height from the rim diameter of a carcass line is H, the maximum width of the carcass line is B, a maximum clearance between a straight line which is parallel with the rotation shaft of a tire on a radial cross section and crosses with the carcass line at two points and as well the distance L between cross points satisfies that L=0.96B-0.77H, and the carcass line is (a), a rim width is J, and the width of an area in which the cord 30a of a belt layer 30 crosses is 1. At this time, the configuration of the carcass line is set so as to satisfy the following respective equations. Namely, 0.45

59. 发明专利

JPS63151503A PNEUMATIC RADIAL TYRE 失效
公开(公告)号：JPS63151503A
公开(公告)日：1988-06-24
申请号：JP29847886
申请日：1986-12-15
申请人： BRIDGESTONE CORP
发明人： KOSEKI HIROYUKI , KURIMA AKIRA , TAKANO NANAKO
IPC分类号： B60C9/18 , B60C9/20 , B60C9/22
摘要： PURPOSE:To improve durability by arranging the widest belt ply whose cord arrangement is specific at the outside of a carcass layer and the second widest belt ply at its outside and arranging the outside ends in the width direction so that they may be positioned between the outside ends, in the width direction, of both belt ply layers on its outside. CONSTITUTION:A belt layer 31 composed of the widest belt ply 32 and the second widest belt ply 33 is arranged at the outside, in the radial direction, of the crown part 27 of a carcass layer 22. And these belt plies 32, 33 are so buried that cords 34, 35 for reinforcement made of steel, etc., may cross each other with a tyre equatorial face 25 between. And a reinforcing ply layer 38 comprised of reinforcing plies 40, 41 buried in parallel with a cords 42, 43 equatorial face is arranged at the outside, in the radial direction, of the belt layer 31 in a shoulder part 39. And the outside ends E, F in the width direction, of the reinforcing plies 40, 41 are positioned between the outside ends G, H of the belt plies 32, 33. By this constitution, belt crack can be prevented at the end, in the width direction, of the widest belt ply.

60. 发明专利

JPS6154305A Pneumatic radial tire for heavy load 失效
标题翻译：用于重载的气动径向轮胎
公开(公告)号：JPS6154305A
公开(公告)日：1986-03-18
申请号：JP17522284
申请日：1984-08-24
申请人： Bridgestone Corp
发明人： KOSEKI HIROYUKI , WATANABE ATSUSHI , TAKANO NANAKO
IPC分类号： B60C9/18 , B60C9/20 , B60C9/28
CPC分类号： B60C9/20 , B60C9/28 , Y10T152/10801
摘要： PURPOSE:To secure stability of a tread portion and reduce strain created between second and third belt plies, by interposing an insert ply between first and second belt plies. CONSTITUTION:The tire includes a carcass 2 having a single-layered ply and a belt 3 composed of first to fourth belt plies each having three-layered cords, which plies are arranged over the carcass 2. The cords of the second and third belt plies 3-2 and 3-3 are intersected with each other with respect to a center circumferential line of the tire, and are arranged at 10-30 deg.C to the center circumferential line. A pair of insert plies 4 are provided between the first and second belt plies 3-1 and 3-2. The insert plies 4 have a tensile elastic modulus of 2.0X10 -6.0X10 kgf/cm per unit width in a direction of cords. The cords of the insert plies 4 are intersected with each other with respect to the center circumferential line of the tire, and are arranged at 30-50 deg.C to the center circumferential line.
摘要翻译：目的：通过在第一和第二皮带层之间插入插入物层，以确保胎面部分的稳定性并减少第二和第三带束层之间产生的应变。构成：轮胎包括具有单层帘布层的胎体2和由具有三层帘线的第一至第四带束层组成的带3，该帘布层布置在胎体2的上方。第二和第三带束层帘线 3-2和3-3相对于轮胎的中心圆周线彼此相交，并且相对于中心圆周线布置在10-30℃。一对插入片4设置在第一和第二带束层3-1和3-2之间。插入片4在帘线方向上的单位宽度的拉伸弹性模量为2.0×10 -4 -6×10 4 kgf / cm 2。插入片4的帘线相对于轮胎的中心圆周线彼此相交，并且相对于中心圆周线布置在30-50℃。

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