JP5006179B2 - Safety tire diaphragm, safety tire, safety tire and rim assembly, and method for manufacturing safety tire diaphragm - Google Patents

Description

  The present invention relates to a safety tire diaphragm applied to a safety tire that can be safely stopped even in a run-flat state in which the tire internal pressure has suddenly decreased due to puncture or the like, and that can travel a certain distance. The present invention relates to a safety tire to which a diaphragm is applied, an assembly of a safety tire and a rim, and a method for manufacturing a diaphragm for a safety tire, and particularly provides a diaphragm for a safety tire that is easy to manufacture.

  Safety tires include tires that support the tire load on the shoulders of air bladders, foams, elastic bodies, cores, etc., and the internal pressure is reduced by closing damaged parts such as holes created by applying or filling sealant. Tires and the like that prevent the above are known. However, since these conventional safety tires have a complicated structure, there are many cases where the defect rate increases and the production efficiency decreases. In some cases, it is necessary to prepare a dedicated rim having a valve for filling air into the air and a structure for attaching the core.

As a safety tire having a relatively simple structure, for example, in Patent Document 1, an inflatable annular diaphragm disposed between both bead portions allows the inner space of the tire to be separated from the inner chamber adjacent to the rim and the tread portion of the tire. A tire divided into two chambers, an outer chamber adjacent to the inner surface, is described. In such a tire, when the inner chamber and the outer chamber are filled with air, normal running is performed, and when the air in the outer chamber is released by puncture or the like and the internal pressure is reduced, the inner pressure in the inner chamber supports the load. And run-flat driving is possible.
Japanese Patent Publication No. 37-1754

  However, the safety tire described in Patent Document 1 requires a valve for filling the outer chamber with air in the sidewall portion of the tire, which complicates the manufacturing process of the pneumatic tire, and thus the safety tire. In addition, there is a problem in that the tire weight is increased and the performance such as tire uniformity is impaired. Moreover, such a diaphragm is annular, and it is difficult to mold and manufacture both the outer surface and the inner surface with a mold, and there is a problem that the manufacturing cost increases.

  An object of the present invention is to solve such problems of the prior art, and the purpose thereof is a safety tire having a simple structure, and a conventional general pneumatic tire is used. Therefore, a diaphragm for a safety tire that is applied to a safety tire that does not require a special valve on a sidewall portion of a pneumatic tire is manufactured easily and easily at a low cost.

  In order to achieve the above object, the present invention comprises a pair of bead portions, a pair of sidewall portions extending from the bead portion to the outside in the tire radial direction, and a tread portion extending between both sidewall portions. An inflatable and deformable annular safety tire diaphragm that is disposed inside a tire and constitutes a safety tire. The safety tire diaphragm is mounted on the rim when the tire is attached to the rim. A safety tire diaphragm, wherein the safety tire diaphragm includes a plurality of safety tire diaphragms along a circumferential direction thereof. A plurality of semi-molded products having shapes corresponding to the respective shapes when divided into pieces are joined to each other along the circumferential direction at their joining ends, and the inner chamber and the Outside A diaphragm safety tire characterized by having at least one communication unit for communicating with the chamber. By adopting such a configuration, the diaphragm for a safety tire can be manufactured by subsequently joining a plurality of pre-manufactured semi-molded products, and it has been difficult to apply in an integrally molded product. Since it is possible to manufacture the diaphragm for safety tires using vacuum molding, injection molding, or the like, the diaphragm for safety tires can be manufactured easily, easily and inexpensively.

  The joining end portions are preferably joined to each other by mechanical joining means. The term “mechanical joining means” as used herein means means for joining the joining ends based on frictional force or the shape of an object. For example, joining using bolts, nuts, or rivets for mechanical joining. And joining based on male / female shapes.

  Alternatively, the joining end portions are preferably joined to each other by welding.

  It is preferable to provide an airtight means between the joint ends joined to each other.

  Further, the safety tire according to the present invention is configured by accommodating any of the safety tire diaphragms described above in the tire, and the assembly of the safety tire and the rim according to the present invention includes: The tire of the safety tire is assembled to a general applicable rim determined by the standard.

  In order to achieve the above object, the present invention includes a pair of bead portions, a pair of sidewall portions extending from the bead portion to the outside in the tire radial direction, and a tread portion extending between both sidewall portions. An inflatable and deformable annular safety tire diaphragm that is disposed inside a tire and that constitutes a safety tire, and the safety tire diaphragm is mounted on the rim when the tire is mounted on the rim. In the method for manufacturing a diaphragm for a safety tire, the space defined between the tire and the rim is divided into two chambers on the inner side and the outer side in the tire radial direction. A semi-molded product molding step for molding a plurality of semi-molded products having shapes corresponding to the respective shapes when divided, and the molded semi-molded products in the circumferential direction at their joint ends. Along Manufacturing a diaphragm for a safety tire, comprising: a semi-molded product joining step for joining together, and a communicating portion forming step for forming at least one communicating portion for communicating the inner chamber and the outer chamber. Is the method. By adopting such a configuration, the diaphragm for a safety tire can be manufactured by subsequently joining a plurality of pre-manufactured semi-molded products, and it is difficult to apply to the integral molding method. Therefore, it is possible to manufacture a safety tire diaphragm using a molding method such as vacuum molding or injection molding. Therefore, the safety tire diaphragm can be manufactured easily, easily and inexpensively.

  It is preferable that the joining end portions are mechanically joined to each other.

  Or it is preferable to join a joining edge part mutually by welding.

  Further, it is preferable to provide an airtight means between the joining end portions before joining the joining end portions to each other.

  By the way, in the claims and the specification, the term “applicable rim” means a rim defined in the standard according to the tire size, and the standard refers to the area where the tire is produced or used. An effective industrial standard, for example, the “Year Book” of The Tire and Rim Association Inc. in the United States, the “Standards Manual” of The European Tire and Rim Technical Organization in Europe, and the Japan Auto Tire Association in Japan. It is “JATMA Year Book”.

  According to the present invention, the safety tire is composed of a plurality of semi-molded articles, so that the structure is simple and a conventional general pneumatic tire can be used. A diaphragm for a safety tire that is applied to a safety tire that does not require a special valve on the sidewall portion can be manufactured easily and easily at a low cost.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a safety tire in which a safety tire having a combination of a diaphragm for safety tires (hereinafter referred to as “diaphragm”) according to an embodiment of the present invention and a conventional pneumatic tire is assembled to an applied rim. FIG. 1B is a cross-sectional view in the width direction showing the assembly of the rim and the rim in a state in which a predetermined air pressure is filled, and FIG. It is sectional drawing.

  A pneumatic tire 1 shown in FIG. 1 (a) is a general pneumatic tire having a radial structure or a bias structure as defined in a standard. A pair of bead portions 3 in which a bead core 2 is embedded, A pair of sidewall portions 4 extending outward in the tire radial direction, a pair of shoulder portions 5 extending further outward, and a tread portion 6 extending between the shoulder portions 5 are provided. Further, although not shown in the drawings, the tire also has other tire constituent members such as a carcass and a belt in accordance with the custom.

  Further, inside the pneumatic tire 1, an inflatable (diameter expansion deformation) annular diaphragm 7 extending between the pair of bead portions 3 is disposed over the entire circumference of the tire. The diaphragm 7 is sandwiched between the bead portion 3 of the pneumatic tire 1 and the rim 8 at both ends in the width direction. When the pneumatic tire 1 is mounted on the rim 8, the tire 1 and the rim A space defined between the inner chamber 9 adjacent to the rim 8 and the outer chamber 10 positioned adjacent to the rim 8 and adjacent to the inner surface of the pneumatic tire 1. It is divided into rooms.

  Therefore, the diaphragm 7 is inflated and deformed based on the pressure difference between the inner chamber 9 and the outer chamber 10 when the tire pressure is suddenly reduced due to puncture or the like, and is applied to the inner surface of the pneumatic tire 1, preferably the entire surface thereof. It adheres evenly over, prevents crushing deformation of the pneumatic tire 1 and supports the load of the pneumatic tire 1 as a shoulder. This ensures a safe stop of the vehicle even if the tire air pressure drops sharply.

  Such a diaphragm 7 may be composed of an air impermeable and extensible material such as rubber, a composite of rubber and nonwoven fabric, or TPE (thermoplastic elastomer) such as TPO (olefinic thermoplastic elastomer). In particular, considering the expansion (breaking elongation) of the diaphragm 7 when the internal pressure of the outer chamber 10 is reduced, the weight of the diaphragm 7 is maintained, the shape of the diaphragm 7 is maintained during normal running, and the creep is suppressed by centrifugal force. Is preferably used. Moreover, it is preferable that the thickness of the diaphragm 7 exists in the range of 0.3 mm-5 mm. When the thickness of the diaphragm 7 is less than 0.3 mm, the strength of the diaphragm 7 becomes insufficient. As a result, when the diaphragm 7 expands, the diaphragm 7 cannot follow the expansion and is torn or comes into contact with the tire inner surface. On the other hand, when the thickness of the diaphragm 7 exceeds 5 mm, the tire mass increases, resulting in creep due to centrifugal force. This is because there is a possibility that the fuel efficiency is lowered and the tire performance is impaired. Furthermore, in order to ensure that the diaphragm 7 rapidly expands to the tire inner surface when the internal pressure is reduced, the breaking elongation of the diaphragm 7 is preferably 50% or more.

  Furthermore, when air is supplied to the inner chamber 9 from the air filling valve 12 provided on the rim 8, the diaphragm 7 is surely allowed to flow into the outer chamber 10 while being punctured. In order to control the flow rate of the pressurized air flowing out from the inner chamber 9 as necessary when the tire air rapidly decreases due to, etc., communication is performed between the inner chamber 9 and the outer chamber 10 while restricting the flow velocity. A communication part (not shown) is provided. In the diaphragm 7 of this embodiment, the communicating portion is configured by opening a small hole penetrating the material constituting the diaphragm 7. According to this, since an additional member is not required, the structure is simple and the weight can be further reduced, and the difference in mass between the portion provided with the small hole and the portion not provided is small, and the tire uniformity is reduced. There is no loss. Furthermore, although the smooth air flow between the inner chamber 9 and the outer chamber 10 is not hindered, a differential pressure due to pressure loss can be generated between the inner chamber 9 and the outer chamber 10. This differential pressure can be adjusted by appropriately selecting the diameter of the small holes. The diameter of the small holes is preferably in the range of 0.5 to 5 mm. This is because if the diameter is less than 0.5 mm, the pressure in the inner chamber 9 may increase too much when filling with the internal pressure, and the diaphragm 7 may expand. This is because when the internal pressure of the outer chamber 10 decreases, the air in the inner chamber 9 also flows out of the tire together with the air in the outer chamber 10, and the run-flat function may not be ensured.

  By adopting such a configuration, when air is supplied to the inner chamber 9 via the air filling valve 12 provided on the rim 8, a part of the supplied air is supplied to the outer chamber 10 via the communication portion. Supplied. When the supply of air is stopped when the internal pressure of the inner chamber 9 reaches a predetermined value, the differential pressure is adjusted by the communicating portion, while the tread portion 6 and the sidewall portion 4 are caused by external factors such as nail treading. If the air is damaged and the air filled in the outer chamber 10 is suddenly removed and becomes a run-flat state, an internal pressure difference is generated between the inner chamber 9 and the outer chamber 10, as shown in FIG. The diaphragm 7 expands and finally reaches the inner surface of the pneumatic tire 1 to replace the load support from the tire.

By the way, although illustration is omitted, the communicating portion can be configured by opening an opening penetrating the material constituting the diaphragm 7 and covering the opening with a filter member having a large number of pores. According to this, since a relatively lightweight filter member is used, the structure is relatively simple and relatively lightweight, and the difference in mass between the portion where the filter member is provided and the portion where the filter member is not provided is compared. And there is little damage to tire uniformity. Furthermore, although the smooth air flow between the inner chamber 9 and the outer chamber 10 is not hindered, a differential pressure due to pressure loss can be generated between the inner chamber 9 and the outer chamber 10. And this differential pressure | voltage can be adjusted by selecting suitably the diameter or number of the pores of a filter member. A suitable filter member is a nonwoven fabric. Since the non-woven fabric is a porous sheet in which fibers are superposed and bonded in a three-dimensional structure, a higher differential pressure can be generated between the inner chamber 9 and the outer chamber 10 as compared with the communication portion constituted by small holes. And this differential pressure | voltage can be adjusted by selecting the fabric weight of a nonwoven fabric suitably. The non-woven fabric applicable to the present invention is not particularly limited as long as it can generate a differential pressure due to pressure loss between the inner chamber 9 and the outer chamber 10, for example, natural fiber, synthetic fiber, glass fiber A metal fiber, carbon fiber, or the like bonded by spun bond, thermal bond, chemical bond, needle punch, stitch bond, or the like can be used. A particularly suitable nonwoven fabric is a PET fiber bonded with a rubber bond. When a non-woven fabric with a high basis weight is used, the flow rate of air that can pass through this is limited. Therefore, when air is supplied through the air filling valve 12, the space between the inner chamber 9 and the outer chamber 10 is temporarily. The differential pressure increases, and the diaphragm 7 may be deformed beyond the yield point. From the viewpoint of preventing this, the basis weight of the nonwoven fabric is preferably 1000 g / m ² or less. On the other hand, since the nonwoven fabric with a low basis weight has low strength, it is preferable that the basis weight of the nonwoven fabric is 5 g / m ² or more from the viewpoint of securing the strength of the diaphragm 7 as a whole.

  Or although illustration is abbreviate | omitted, the communicating part can also be comprised by opening the opening which penetrates this in the material which comprises the diaphragm 7, and arrange | positioning a valve member in this opening. According to this, the differential pressure between the inner chamber 9 and the outer chamber 10 can be controlled more reliably. Such a valve member is not particularly limited as long as it opens and closes according to the differential pressure between the inner chamber 9 and the outer chamber 10, and for example, a check valve or a relief valve can be used.

  In addition, the diaphragm 7 of this embodiment is composed of two left and right half-molded products 7a and 7b joined with the equator plane of the diaphragm 7 interposed therebetween. Such semi-molded products 7a and 7b can be molded using various molding methods such as injection molding, vacuum molding, pressure molding and blow molding. First, in the semi-molded product molding process, the diaphragm 7 is formed. A plurality (two in this embodiment) of semi-molded products 7a and 7b having a shape corresponding to the shape when divided into a plurality of (two in this embodiment) along the circumferential direction, In the subsequent semi-molded product joining step, the semi-molded products 7a and 7b are formed by joining the joined end portions 13 and 14 to each other along the circumferential direction with, for example, an adhesive. In addition, the communication part can be formed at the same time as any one of the above processes or in a subsequent process of the above process, and from the viewpoint of improving work efficiency, the communication part is simultaneously formed with the molding of the semi-molded products 7a and 7b. Is preferably formed.

  The safety tire 15 is configured by combining the diaphragm 7 and the conventional pneumatic tire 1 as described above, and the safety tire 15 and the rim 8 assembly 16 are mounted by attaching the safety tire 15 to the rim 8. Is formed.

  According to the diaphragm 7 of this embodiment, the diaphragm 7 is composed of a plurality of pre-manufactured (two in this embodiment) semi-molded products 7a, 7b, and their joint ends 13 along the circumferential direction afterwards. 14 can be manufactured by joining together, and the diaphragm 7 can be manufactured by using vacuum molding, injection molding, or the like, which has been difficult to apply to an integrally molded product. 7 can be easily and easily manufactured at low cost.

  Next, a diaphragm according to another embodiment of the present invention will be described with reference to the drawings. Here, FIG. 2 is a view schematically showing a part of a diaphragm of another embodiment according to the present invention, (a) is a cross-sectional perspective view before joining, and (b) is a cross-sectional view in the width direction after joining. FIG. In addition, the same code | symbol is attached | subjected to the member similar to the diaphragm 7 of previous embodiment, and the description is abbreviate | omitted.

  The diaphragm 7 shown to Fig.2 (a), (b) is comprised from two half molded products 7a and 7b on both sides of an equatorial plane. The two half-molded products 7a and 7b have joint ends 13 and 14 at their ends. A male threaded portion 17 is formed at the joint end 14 of one half-molded product 7b, and a female threaded portion 18 is molded at the joint end 13 of the other half-molded product 7a, as shown in FIG. As shown, the semi-molded products 7a and 7b are opposed to each other and turned in opposite directions (arrow directions in FIG. 2B) and screwed together so that the semi-molded products 7a and 7b are joined to each other. These male screw portion 17 and female screw portion 18 constitute a mechanical joining means. Other configurations and operations are the same as those of the diaphragm 7 (see FIG. 1) of the previous embodiment.

  According to the diaphragm 7 of this embodiment, the diaphragm 7 is composed of a plurality of pre-manufactured (two in this embodiment) semi-molded products 7a, 7b, and their joint ends 13 along the circumferential direction afterwards. 14 can be manufactured by joining together, and the diaphragm 7 can be manufactured by using vacuum molding, injection molding, or the like, which has been difficult to apply to an integrally molded product. 7 can be easily and easily manufactured at low cost. Furthermore, by joining the semi-molded products 7a and 7b to each other in this way, it can be easily joined by simply applying to the joining surface, while being easy to cause deterioration over time, the application amount and the pressure at the time of adhesion, The semi-molded products 7a and 7b can be easily and reliably joined without using an adhesive that causes many problems such as the adhesive strength changing depending on the situation and the need for drying time.

  Next, a diaphragm according to still another embodiment of the present invention will be described with reference to the drawings. Here, FIG. 3 is a diagram schematically showing a part of a diaphragm of still another embodiment according to the present invention, (a) is a sectional perspective view before joining, and (b) is a width direction after joining. It is sectional drawing. In addition, the same code | symbol is attached | subjected to the member similar to the diaphragm 7 of the said embodiment, and the description is abbreviate | omitted.

  The diaphragm 7 shown to Fig.3 (a), (b) is comprised from the two half-molded products 7a and 7b on both sides of an equatorial plane. The two half-molded products 7a and 7b have joint ends 13 and 14 at their ends. Opposed flange portions 20 and 21 are formed at the joint end portions 13 and 14, and the flange portions 20 and 21 further have a through hole 22 and a retaining protrusion 23 having a retaining head at the tip. Are alternately provided at predetermined intervals in the circumferential direction, and the retaining protrusions 23 are passed through the corresponding through holes 22 and the retaining heads are passed over the through holes 22. Thus, the two half-molded products 7a and 7b are joined to each other. The retaining protrusions 23 and the through holes 22 constitute mechanical joining means. Other configurations and operations are the same as those of the diaphragm 7 (see FIG. 1) of the previous embodiment.

  According to the diaphragm 7 of this embodiment, the diaphragm 7 is composed of a plurality of pre-manufactured (two in this embodiment) semi-molded products 7a, 7b, and their joint ends 13 along the circumferential direction afterwards. 14 can be manufactured by joining together, and the diaphragm 7 can be manufactured by using vacuum molding, injection molding, or the like, which has been difficult to apply to an integrally molded product. 7 can be easily and easily manufactured at low cost. Furthermore, by joining the semi-molded products 7a and 7b to each other in this way, it can be easily joined by simply applying to the joining surface, while being easy to cause deterioration over time, the application amount and the pressure at the time of adhesion, The semi-molded products 7a and 7b can be easily and reliably joined without using an adhesive that causes many problems such as the adhesive strength changing depending on the situation and the need for drying time.

  Next, a diaphragm according to still another embodiment of the present invention will be described with reference to the drawings. Here, FIG. 4 is a diagram schematically showing a part of a diaphragm of still another embodiment according to the present invention, (a) is a cross-sectional perspective view before joining, and (b) is a width direction after joining. It is sectional drawing. In addition, the same code | symbol is attached | subjected to the member similar to the diaphragm 7 of previous embodiment, and the description is abbreviate | omitted.

  The diaphragm 7 shown to Fig.4 (a), (b) is comprised from two half-molded products 7a and 7b on both sides of an equatorial plane. The two half-molded products 7a and 7b have joint ends 13 and 14 at their ends. A protrusion 25 extending continuously or intermittently in the circumferential direction is laid on the lower surface in the radial direction of the joint end 14 of one half-molded product 7b, and the radial direction of the joint end 13 of the other half-molded product 7a. On the upper surface, corresponding continuous grooves 26 extending continuously or intermittently in the circumferential direction are formed, and by fitting them under elastic deformation, the two half-molded products 7a and 7b are They are joined together. These protrusions 25 and the groove 26 constitute a mechanical joining means. Other configurations and operations are the same as those of the diaphragm 7 (see FIG. 1) of the previous embodiment.

  According to the diaphragm 7 of this embodiment, the diaphragm 7 is composed of a plurality of pre-manufactured (two in this embodiment) semi-molded products 7a, 7b, and their joint ends 13 along the circumferential direction afterwards. 14 can be manufactured by joining together, and the diaphragm 7 can be manufactured by using vacuum molding, injection molding, or the like, which has been difficult to apply to an integrally molded product. 7 can be easily and easily manufactured at low cost. Furthermore, by joining the semi-molded products 7a and 7b to each other in this way, it can be easily joined by simply applying to the joining surface, while being easy to cause deterioration over time, the application amount and the pressure at the time of adhesion, The semi-molded products 7a and 7b can be easily and reliably joined without using an adhesive that causes many problems such as the adhesive strength changing depending on the situation and the need for drying time.

  Next, a diaphragm according to still another embodiment of the present invention will be described with reference to the drawings. Here, FIG. 5 is a diagram schematically showing a part of a diaphragm of still another embodiment according to the present invention, wherein (a) is a cross-sectional perspective view before joining, and (b) is a width direction after joining. It is sectional drawing. In addition, the same code | symbol is attached | subjected to the member similar to the diaphragm 7 of previous embodiment, and the description is abbreviate | omitted.

  The diaphragm 7 shown to Fig.5 (a), (b) is comprised from two half molded products 7a and 7b on both sides of an equatorial plane. The two half-molded products 7a and 7b have joint end portions 13 and 14 at their end portions, respectively. The joint end portions 13 and 14 are overlapped with each other in the radial direction and welded to each other by, for example, frictional heat, hot air, a heat seal plate, etc., so that the two half-molded products 7a and 7b are mutually connected. Be joined.

  According to the diaphragm 7 of this embodiment, the diaphragm 7 is composed of a plurality of pre-manufactured (two in this embodiment) semi-molded products 7a, 7b, and their joint ends 13 along the circumferential direction afterwards. 14 can be manufactured by joining together, and the diaphragm 7 can be manufactured by using vacuum molding, injection molding, or the like, which has been difficult to apply to an integrally molded product. 7 can be easily and easily manufactured at low cost. Furthermore, by joining the semi-molded products 7a and 7b to each other in this way, it can be easily joined by simply applying to the joining surface, while being easy to cause deterioration over time, the application amount and the pressure at the time of adhesion, The semi-molded products 7a and 7b can be easily and reliably joined without using an adhesive that causes many problems such as the adhesive strength changing depending on the situation and the need for drying time. Furthermore, since the semi-molded products 7a and 7b are joined to each other by welding, the joining of the semi-molded products 7a and 7b can be further strengthened. In addition, since it is not necessary to form the mechanical joining means as described above, it is relatively easy to manufacture.

  In the various diaphragms 7 as described above, it is preferable to interpose, for example, a rubber gasket or a sealing material as an airtight means between the joining end portions 13 and 14 joined to each other. In this way, the space between the inner chamber 9 and the outer chamber 10 of the safety tire defined by the diaphragm 7 can be reliably kept airtight, and the design of the communication portion, in particular the air that passes through the communication portion. The flow rate can be easily designed. Further, it is possible to join the joint end portions 13 and 14 to be joined to each other while providing a predetermined gap, and to form a communication portion by the gap.

  In relation to the diaphragm 7 described above, the internal pressure in the diaphragm 7 (inside the inner chamber 9) during normal running is preferably equal to or higher than the inner pressure in the outer chamber 10. According to this, when the internal pressure of the outer chamber 10 is reduced, the diaphragm 7 can be rapidly expanded and deformed. If a large tension is applied to the diaphragm 7 in a normal running state, the diaphragm 7 may creep and deform and contact the tire inner surface when used for a long time. From the viewpoint of preventing this, the internal pressure of the inner chamber 9 is preferably 110% or less of the internal pressure of the outer chamber 10.

  Note that the above description shows only a part of the embodiment of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the gist of the present invention. . Further, the joining at the joining end part of each semi-molded product may be performed by using a mechanical joining means such as a male screw part, a female screw part, a ridge and a groove, and welding or an adhesive. Furthermore, bolts / nuts or rivets may be used as other mechanical joints. Furthermore, in the embodiment described above, there are two semi-molded products constituting the diaphragm 7, but the number is not limited to this, and may be three or more.

  As is apparent from the above description, according to the present invention, a safety tire having a simple structure can be used, and a conventional general pneumatic tire can be used, and a special valve is attached to the sidewall portion of the pneumatic tire. A diaphragm for a safety tire applied to a safety tire that does not need to be manufactured can be easily and easily manufactured at low cost.

(A) is an assembly of a safety tire and a rim formed by assembling a safety tire having a combination of a diaphragm for a safety tire according to an embodiment of the present invention and a conventional pneumatic tire to an applicable rim, and applying a predetermined air pressure. FIG. 1B is a width direction cross-sectional view showing a state in which the internal pressure is reduced in the assembly shown in FIG. 1A. It is a figure which shows schematically a part of diaphragm for safety tires of other embodiments according to this invention, (a) is a width direction section perspective view before joining, and (b) is a width direction after joining. It is sectional drawing. It is a figure which shows schematically a part of diaphragm for safety tires of further another embodiment according to this invention, (a) is the width direction cross-sectional perspective view before joining, (b) is the width after joining. FIG. It is a figure which shows schematically a part of diaphragm for safety tires of further another embodiment according to this invention, (a) is the width direction cross-sectional perspective view before joining, (b) is the width after joining. FIG. It is a figure which shows schematically a part of diaphragm for safety tires of further another embodiment according to this invention, (a) is the width direction cross-sectional perspective view before joining, (b) is the width after joining. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pneumatic tire 2 Bead core 3 Bead part 4 Side wall part 5 Shoulder part 6 Tread part 7 Diaphragm 7a Semi-molded article 7b Semi-molded article 8 Rim 9 Inner chamber 10 Outer chamber 12 Air filling valve 13, 14 Joint end 15 Safety Tire 16 Safety Tire / Rim Assembly 17 Male Threaded Part 18 Female Threaded Part 20 and 21 Flange Part 22 Through-hole 23 Retaining Protrusion Piece 25 Projection Line 26 Line Groove

Claims (10)

A safety tire is configured by being arranged on the inner side of a tire having a pair of bead portions, a pair of sidewall portions extending from the bead portion to the outer side in the tire radial direction, and a tread portion extending between both sidewall portions. An inflatable and deformable annular safety tire diaphragm, wherein the safety tire diaphragm has a space defined between the tire and the rim in a tire radial direction when the tire is mounted on the rim. In the diaphragm for safety tires, which is divided into two chambers inside and outside,
The safety tire diaphragm has a plurality of semi-molded products having shapes corresponding to the respective shapes when the safety tire diaphragm is divided into a plurality of pieces along the circumferential direction. And joined together along the circumferential direction, and
A safety tire diaphragm comprising at least one communicating portion communicating the inner chamber and the outer chamber.   The diaphragm for a safety tire according to claim 1, wherein the joining end portions are joined to each other by a mechanical joining means.   The diaphragm for a safety tire according to claim 1, wherein the joint end portions are joined to each other by welding.   The diaphragm for safety tires as described in any one of Claims 1-3 which provides an airtight means between the said joining edge parts joined mutually.   The safety tire comprised by accommodating the diaphragm for safety tires as described in any one of Claims 1-4 in a tire.   An assembly of a safety tire and a rim configured by assembling the safety tire according to claim 5 to a rim. A safety tire is configured by being arranged on the inner side of a tire having a pair of bead portions, a pair of sidewall portions extending from the bead portion to the outer side in the tire radial direction, and a tread portion extending between both sidewall portions. An inflatable and deformable annular safety tire diaphragm, wherein the safety tire diaphragm has a space defined between the tire and the rim in a tire radial direction when the tire is mounted on the rim. In the method for producing a diaphragm for a safety tire, which is divided into an inner chamber and an outer chamber,
A semi-molded product molding step for molding a plurality of semi-molded products having shapes corresponding to respective shapes when the safety tire diaphragm is divided into a plurality along the circumferential direction;
A semi-molded product joining step for joining the molded semi-molded products to each other along the circumferential direction at their joint ends,
And a communication part forming step of forming at least one communication part for communicating the inner chamber and the outer chamber.   The manufacturing method of the diaphragm for safety tires of Claim 7 which joins the said joining edge part mutually by a mechanical joining means.   The manufacturing method of the diaphragm for safety tires of Claim 7 which joins the said joining edge part mutually by welding.   The manufacturing method of the diaphragm for safety tires as described in any one of Claims 7-9 which provides an airtight means between these joining edge parts, before joining the said joining edge parts mutually.

Images