JP4995504B2 - Annular structure - Google Patents

Description

  The present invention relates to an annular structure such as a bead wire for reinforcing a rubber member included in an air spring, a tire, an air roller, a pipe joint, and the like.

  In general, an annular bead for reinforcing an end of an air spring, a tire, an air roller, a pipe joint, or the like provided in a truck or a bus is embedded in the rubber member (for example, Patent Document 1). ).

  In order to embed a bead in a rubber member, when molding an unvulcanized rubber before vulcanization molding on a rubber member, a method of covering the unvulcanized rubber being molded with a bead previously formed in an annular shape, In many cases, a method of forming a bead by winding a thin wire around the unvulcanized rubber being molded a plurality of times is employed.

However, among these methods, the method of using a bead formed in an annular shape takes time to arrange the annular bead on unvulcanized rubber, and the method of winding a thin wire multiple times Since it takes a lot of time to wind, as another method, it is required to arrange a linear member around the unvulcanized rubber being molded and connect both ends thereof to form an annular bead.
JP2003-202045 (paragraph number 0032)

  By the way, as a method for connecting both ends of the linear member, a brazing method is conceivable. However, this method heats rubber, and thus cannot be used for forming a bead of a rubber member.

  As another method of connecting both ends of the linear member, a method of wrapping both ends of the linear member is conceivable. However, in the case of simply wrapping both ends of the linear member, rubber is used at the wrap portion. Since the thickness of the manufactured parts is thick, the sealing performance with the mounting bracket is reduced due to non-uniform dimensions in the vicinity of the wrap part, and the product characteristics are deteriorated due to the rigidity of the wrap part being greater than other parts. Is concerned.

  Furthermore, by cutting both ends of the linear member into a sharp taper and wrapping both ends so that the taper surfaces are aligned, the thickness near the wrap portion becomes thicker or the rigidity increases. Although it is conceivable to prevent this, the taper surfaces at both ends are likely to be shifted, and the sufficient lap length required for the bead cannot be obtained because the wrap length cannot be set to a sufficient length. In addition, it is difficult to cut a bead wire using a twisted wire to make a sharp taper, and a bead wire with a large number of single wires arranged in parallel can be cut sharply. Hard to do.

  An object of the present invention is to provide an annular structure such as a bead wire that can obtain a uniform rigidity and sufficient tensile strength over the entire circumference while connecting both ends of a linear member to form an annular shape.

  In order to achieve the above object, the annular structure according to the present invention is configured to reinforce a rubber member by connecting both ends of a linear member in an annular shape, and is provided at both ends of the linear member. Are formed with concavities and convexities that fit together.

  According to the above configuration, the thickness and rigidity of the connecting portion can be made substantially equal to other portions while connecting while preventing the positional deviation between the ends by fitting the unevenness at both ends of the linear member. Moreover, sufficient tensile strength can be obtained by setting the length of the irregularities to a desired length.

  If both ends of the linear member are connected via rubber that has penetrated between the concave and convex portions, the concave and convex portions need only be fitted to such an extent that displacement of both ends can be prevented. There is no need to strongly push the unevenness or separately apply an adhesive, and the connection of both ends of the linear member can be facilitated.

  If the linear member has a configuration in which a plurality of wires are bundled, and part of the wire is shifted in the length direction so that irregularities are formed at both ends, the linear member is set to a desired tensile strength. However, it is possible to reduce the bending rigidity to such an extent that it can be easily bent into an annular shape, and to facilitate the formation of irregularities at both ends.

  Here, in order to form irregularities on both ends of the linear member, a plurality of wires having the same length are bundled by bundling a plurality of wires and cutting both ends, and a part of the wires are lengthened. It is particularly suitable to draw out and shift in the direction, whereby the unevenness at both ends can be set to the same shape. As another method for forming irregularities at both ends of the linear member, when bundling a plurality of wires, some of the wires may be shifted in the length direction, and both ends of each wire Unevenness may be formed on the surface. Moreover, the length from which a several wire differs mutually may be sufficient, and you may use the one wire which formed the unevenness | corrugation in both ends as a linear member.

  If the linear member is composed of a core wire and a plurality of outer peripheral lines arranged around the core wire and twisted together, the core line is drawn from the outer peripheral line to form irregularities at both ends, and the plurality of outer peripheral lines Therefore, even in a state where the core wire is pulled out to form the recess, the plurality of outer peripheral lines can be prevented from being separated from each other, and the shape of the recess can be maintained.

  If at least one of the core wire and the outer peripheral wire of the linear member is a stranded wire formed by twisting a plurality of strands, the bending rigidity of the linear member is further reduced, and the deformation performance and the restoration performance are improved. Can improve the adhesion.

  If the linear member is subjected to a surface treatment that increases the adhesion to rubber, the annular structure can be sufficiently integrated with the surrounding rubber, and both ends of the linear member can be more reliably connected via the rubber. it can. In particular, by connecting both ends of the linear member via rubber that has entered between the irregularities, a sufficient tensile strength can be obtained even at the connecting portion. Here, examples of the surface treatment include brass plating, zinc plating, and bronze plating applied to the wire constituting the linear member, and further, adhesive treatment and the like can be employed.

  The annular structure according to the present invention is used to reinforce any rubber member, such as one that surrounds and reinforces the opening of a bag-like rubber member, or one that surrounds and reinforces the central part of a tubular member or rod-like member. Although it can be used, “it is embedded in at least one end in the direction of the central axis of a rubber cylinder in which a reinforcing cord layer is provided on a cylindrical rubber membrane, and the end of the reinforcing cord layer is engaged. It can be suitably used as a “bead wire that stops”.

  As the reinforcing cord layer, one formed by winding a Suda record can be exemplified, and in order to lock the end portion of this reinforcing cord layer to the bead wire, a linear member is arranged outside the end portion of the wound Suda record. A bead wire may be formed by connecting both ends of the linear member, and the end of the suda record may be folded back so as to be engaged with the bead wire.

  Further, “the reinforcing cord layer has a predetermined pitch in the circumferential direction for each winding of the reinforcing cord that surrounds the central axis a plurality of times while being inclined with respect to the central axis direction so as to pass through both ends of the rubber cylinder. It is particularly preferably used as a bead wire that is arranged in the circumferential direction by being shifted and is arranged so as to be hung on a portion of the reinforcing cord that passes through the end portion of the rubber cylindrical body to lock the reinforcing cord layer. be able to.

  In other words, when one or several reinforcing cords are continuously wound around both ends of the rubber cylinder to form a reinforcing cord layer by slightly shifting the position in the circumferential direction, the reinforcing cord layer is locked. In order to achieve this, it is necessary to dispose the bead wire so as to be hung on a portion of the reinforcing cord passing through the end of the rubber cylinder. In this case, it is not possible to use a bead formed in a ring shape in advance or a bead formed by winding a thin wire a plurality of times. However, if the annular structure according to the present invention is adopted, it is hung on the reinforcement cord while it is wound. By arranging the linear member in this manner and connecting both ends of the linear member when the winding of the reinforcing cord is completed, an annular bead wire can be arranged.

Further, an annular structure for reinforcing a rubber-made member, is configured in an annular by connecting the ends of the linear member, the linear member comprises a sheath covering the core wire, the periphery of the core wire An annular structure characterized in that the sheath and the core wire are shifted from each other in the length direction so that the position of the seam of the core wire and the position of the sheath seam when both ends are connected to each other is adopted. Ru can also be.

  According to this configuration, in a state where both ends of the linear member are connected and configured in an annular shape, the position of the seam of the core wire and the position of the sheath of the sheath are shifted. The seam can be reinforced with a core wire, and the bulge near the seam can be dispersed. By disposing the sheath and the core wire in the length direction, both ends of the sheath and the core wire are shifted in the length direction, so that the position of the core seam and the position of the sheath seam are shifted.

  Here, as a core wire, in addition to a single wire, a stranded wire, etc., a tubular wire or a sheet-shaped material rolled up into a rod shape or a tubular shape can be exemplified. The sheath can be exemplified by a tubular wire, a sheet-shaped material rolled into a tube, or a plurality of wires that are twisted together to form a tubular shape as a whole. In addition, it is suitable to employ | adopt a flexible thing as a core wire and a sheath.

  As described above, according to the present invention, since both ends of a linear member arranged around the unvulcanized rubber are connected to form an annular shape, an annular structure such as a bead wire can be easily formed. In addition, since the concavities and convexities formed at both ends of the linear member are fitted and connected, the size and rigidity in the vicinity of the connecting portion can be made substantially equal to other parts, and sufficient tensile strength can be obtained, and rubber It is possible to prevent deterioration in sealing performance and product characteristics between the manufactured member and the mounting bracket.

  In addition, even when a reinforcing cord layer is formed by continuously winding one or several reinforcing cords, a linear member is arranged so as to hang around the reinforcing cord while winding the reinforcing cord. When both ends of the linear member are connected to form a bead wire, the reinforcing cord layer can be locked with the bead wire.

  Hereinafter, the best mode for carrying out an annular structure according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a rubber cylinder provided with a bead wire as an annular structure according to the present invention, the left half showing a state before vulcanization molding and the right half showing a state after vulcanization molding. FIG. 2 is a side view of the linear member, and the left end shows an axial sectional view. FIG. 3 is a cross-sectional view of the linear member. 4A and 4B are schematic views showing the connection of both ends of the linear member, where FIG. 4A shows a state before connection, and FIG. 4B shows a state after connection.

  A bead wire 1 as an annular structure according to the present invention is for embedding in an end portion of a rubber cylinder 2 and reinforcing the end portion of the rubber cylinder 2. By bending the linear member 3 on which the portion 3b is formed and fitting the concave portion 3a and the convex portion 3b, both ends of the linear member 3 are connected to form an annular shape.

  As shown in FIGS. 2 and 3, the linear member 3 is composed of a plurality of core wires 4 and a plurality of outer peripheral wires 5 arranged around the core wires 4 and twisted together. After aligning the both ends of the member 3 by cutting or the like, the core wire 4 is pulled out from the outer peripheral line 5 and shifted in the length direction, thereby forming the recesses 3a and the protrusions 3b at both ends. The core wire 4 of the linear member 3 is a single wire, the outer peripheral wire 5 is a stranded wire formed by twisting a plurality of strands 5a, and the core wire 4 and the peripheral wires 5a are bonded to rubber. Surface treatment such as brass plating is performed to increase the thickness.

  Here, the connection of both ends of the linear member 3 will be described. First, as shown in FIG. 4A, the linear member 3 is bent so that both ends are opposed to each other, and further, the concave portions 3a and the convex portions 3b at both ends are formed. Fit and vulcanize the surrounding rubber. As a result, the rubber enters the gap between the concave portion 3a and the convex portion 3b and is vulcanized and bonded to the core wire 4 and the strand 5a of the outer peripheral wire 5, and both ends of the linear member 3 are sufficiently pulled through this rubber. As shown in FIG. 4 (b), an annular bead wire 1 is configured with strength.

  In addition, as shown in FIG. 5, it replaces with the linear member 3 comprised from the several core wire 4 which consists of a single wire, and the several outer peripheral wire 5 which consists of a twisted wire, You may make it use the linear member 8 which has arrange | positioned and twisted the outer periphery line 7 which consists of a single wire around.

  Next, the rubber cylinder 2 shown in FIG. 1 will be described. FIG. 6 is a perspective view showing the reinforcing cord layer, and shows a state where the reinforcing cord layer is formed on the outside of the molding former and the inner surface unvulcanized rubber. Note that FIG. 6 is shown upside down so that the lower end portion can be easily seen, and only the lower portion (upper portion in FIG. 6) of the molding former and the inner surface unvulcanized rubber is shown.

  The rubber cylinder 2 is used as, for example, a diaphragm of an air spring mounted on a truck or a bus. The upper end portion is sandwiched between a pair of fastening fittings 9a and 9b, and the piston 10 is inserted into the lower end portion. The part 10a is press-fitted. The rubber cylinder 2 is provided with a reinforcing cord layer 12 for increasing resistance to internal pressure and transmission force on a cylindrical rubber film 11 having a central portion larger in diameter than both ends and substantially spherical as a whole, and a lower end portion. The bead wire 1 is buried and the reinforcing cord layer 12 is locked.

  The cylindrical rubber film 11 includes an inner rubber 11a and an outer rubber 11b with a reinforcing cord layer 12 interposed therebetween. The cylindrical rubber film 13 includes an inner unvulcanized rubber 13a and an outer unvulcanized rubber 13b. Vulcanized and molded. The cylindrical unvulcanized rubber film 13 has a central portion with a constant diameter and both end portions set to have a smaller diameter than the central portion, and is substantially spherical when vulcanized.

  The reinforcing cord layer 12 is provided at the center of the cylindrical rubber film 11 in two layers, an inner surface side reinforcing cord layer 12a and an outer surface side reinforcing cord layer 12b, and the inner surface side reinforcing cord layer 12a and the outer surface side reinforcing cord layer 12b are provided. It is composed of a single reinforcing cord 14 surrounding the central axis of the rubber cylinder 1.

  The reinforcing cord 14 surrounds the central axis and inclines at a constant inclination angle with respect to the central axis direction, passes through both end portions of the cylindrical rubber film 11, and further, at a predetermined pitch in the circumferential direction for each winding. The center axis is surrounded a plurality of times until the arrangement position makes one round around the center axis while shifting. Thus, the reinforcing cords 14 are arranged in the circumferential direction while being inclined with respect to the central axis direction of the rubber cylinder 2 on the inner surface side reinforcing cord layer 12a and the outer surface side reinforcing cord layer 12b. Reinforcing cords 14 arranged on 12a and outer surface side reinforcing cord layer 12b are set so that their inclination directions intersect with each other without being knitted together.

  The bead wire 1 embedded in the lower end portion of the rubber cylinder 2 is arranged so as to be hung on a hanging portion 14 a passing through the lower end portion of the rubber cylinder 2 in the reinforcing cord 14. While locking a lower end part, the lower end part of the rubber cylinder 2 is reinforced and the breadth is controlled, and the sealing performance of the rubber cylinder 2 and the piston 10 is enhanced.

  The inclination angle of the reinforcing cord 14 arranged on the inner surface side reinforcing cord layer 12a and the outer surface side reinforcing cord layer 12b with respect to the central axis is β (−β) in a state where the reinforcing cord 14 is embedded in the cylindrical unvulcanized rubber film 13. It is set to change to β1 (−β1) after being vulcanized and molded into the cylindrical rubber film 11.

  Next, a method for manufacturing the rubber cylinder 2 will be described. FIG. 7 is a perspective view showing how the reinforcing cord surrounds the central axis. Note that FIG. 7 is shown upside down so that the lower end can be easily seen. FIG. 8 is a bottom view showing how the bead wires are arranged, and FIG. 9 is a bottom view showing how the reinforcing cord surrounds the central axis. 10A and 10B are views showing a cylindrical unvulcanized rubber film formed around the molding former, in which FIG. 10A is an axial sectional view and FIG. 10B is an axial perpendicular sectional view. FIG. 11 is an axial cross-sectional view of a cylindrical unvulcanized rubber film and a cylindrical rubber film.

  First, the inner unvulcanized rubber 13a is wound around the core-type molding former 15 in which the outer diameters at both ends in the central axis direction are set to be smaller than the outer diameter of the central part.

  Next, as shown in FIG. 7, one reinforcing cord 14 covered with unvulcanized rubber is inclined at a constant inclination angle β (−β) with respect to the central axis, and both ends of the inner surface unvulcanized rubber 13a. The central axis is wrapped around the central axis, and the central axis is wound a plurality of times until the arrangement position makes one round around the central axis while shifting by a predetermined pitch in the circumferential direction for each winding. Thus, the reinforcing cords 14 are arranged in the circumferential direction, and the inner surface side reinforcing cord layer 12a and the outer surface side reinforcing cord layer 12b are formed on the entire outer periphery of the inner surface unvulcanized rubber 13a, and the state shown in FIG. 6 is obtained.

  Further, when the reinforcing cord 14 is hung on the lower end portion of the inner unvulcanized rubber 13a, the linear member 3 is pressed against the lower end portion of the inner unvulcanized rubber 13a with the reinforcing cord 14, as shown in FIGS. While doing so, the linear member 3 is gradually arranged to hang the linear member 3 on the reinforcing cord 14 over the entire circumference. When the winding of the reinforcement cord 14 is completed, the concave portion 3a and the convex portion 3b at both ends of the linear member 3 are fitted to form an annular bead wire 1.

  Here, how the reinforcing cord 14 surrounds the central axis and how the linear member 3 is hooked on the reinforcing cord 14 will be described in more detail. First, the reinforcing cords 14 are arranged on the outer peripheral surface of the central portion of the inner surface unvulcanized rubber 4a at a predetermined inclination angle (β), hung on the outer peripheral surface of the end portion of the inner surface unvulcanized rubber 13a, and sandwiching the central axis. Guide to the outer peripheral surface on the opposite side. Subsequently, it arranges on the central part outer peripheral surface on the opposite side of the inner surface unvulcanized rubber 13a at an inclination angle (−β), hangs on the end outer peripheral surface of the inner surface unvulcanized rubber 13a, and guides it to the original outer peripheral surface.

  At this time, the start point 16a and the end point 16b in one wrapping are shifted in the circumferential direction by a predetermined code pitch set to be equal to or larger than the code diameter. Further, the inclination angle of the reinforcing cord 14 is not changed as much as possible when it is hung on the outer peripheral surface of the end portion. Since the end portion is set to have a smaller diameter than the center portion, a step between the end portion and the center portion locks the reinforcing cord 14 to prevent deviation.

  As a result, the reinforcing cords 14 are arranged substantially in parallel with each other on the opposite side across the central axis, and a single winding operation of the reinforcing cords 14 is completed. At this time, the reinforcing cords 14 arranged on the opposite side across the central axis are set to have the same size and the opposite inclination angles (β, −β) when viewed from the outer peripheral side.

  By repeating the winding operation of the reinforcement cord 14 by changing the inclination direction around the central axis while maintaining the inclination angle (β, −β) of the reinforcement cord 14 with respect to the central axis due to the deviation of the cord pitch during winding. The reinforcing cords 14 are arranged in the circumferential direction. By repeating the winding operation until the arrangement of the reinforcing cords 14 inclined in the same direction makes one round in the circumferential direction, the cylindrical inner surface side reinforcing cord layers 12a in which the inclined directions intersect with each other without the reinforcing cords 14 being knitted together, and The outer surface side reinforcing cord layer 12b is formed.

  Further, as shown in FIG. 9, when the reinforcing cord 14 is hung on the lower end portion of the inner unvulcanized rubber 13a, first, the reinforcing cord is pressed so as to press the starting end side of the linear member 3 at the terminal end side of the hooking portion 14a. 14 and arranging the starting end side of the linear member 3 inside the terminal end side of the hooking portion 14a, and then arranging the terminal end side of the linear member 3 outside the starting end side of the hooking portion 14a. To complete a single winding operation. As a result, in a single winding operation of the reinforcing cord 14, the linear member 3 passes inside and outside the hanging portion 14a of the reinforcing cord 14, and the linear member 3 is hung on one hanging portion 14a.

  By repeating the winding operation of the reinforcing cord 14 while passing the linear member 3 from the inner side to the outer side of the hanging portion 14a in the same procedure, the linear member 3 is gradually and entirely disposed around the reinforcing cord 14. It hangs on all the hanging parts 14a. When the winding of the reinforcing cord 14 is completed and the linear member 3 is disposed on the entire circumference, the concave portion 3a and the convex portion 3b at both ends of the linear member 3 are fitted.

  Thereafter, the outer surface unvulcanized rubber 13b is wound around the outer side of the reinforcing cord layer 12 to form the tubular unvulcanized rubber film 13, and the state shown by the solid line in the left half of FIG. 1, FIG. 10, and FIG. 11 is obtained. . At this time, both ends of the linear member 3 are connected to each other through the rubber that has entered the gaps between the concave portions 3 a and the convex portions 3 b at both ends of the linear member 3, thereby forming the annular bead wire 1. The periphery of the bead wire 1 is a portion where the hanging portions 14a of the reinforcing cords 14 covered with unvulcanized rubber are closely arranged, and a sufficient amount of rubber to enter the gap between the concave portions 3a and the convex portions 3b. Exists.

  Further, the core-type molding former 15 is disassembled to remove the cylindrical unvulcanized rubber film 13, this is incorporated into an outer mold, a bag is inserted inside, and the cylindrical unvulcanized rubber film 13 is heated under pressure. By vulcanizing and molding the substantially spherical cylindrical rubber film 11, the rubber cylinder 2 in the state shown in the right half of FIG. 1 and the two-dot chain line in FIG. 11 is obtained.

  Next, taking the air spring as an example, the product of the present invention including the bead wire of the present invention is compared with the conventional product including the conventional bead wire. The present invention products 1 and 2 and the conventional products 1 and 2 each have a cross-sectional view in FIG. 1, and the upper end portion of the rubber cylinder 2 is sandwiched between a pair of fasteners 9 a and 9 b and the lower end portion. The insertion portion 10a of the piston 10 is press-fitted into. The conventional products 1 and 2 are provided with bead wires 17 and 18 in place of the bead wires 1 included in the products 1 and 2 of the present invention.

  Each of the rubber cylinders 2 has an inner diameter of φ150 mm, an outer diameter of the central portion of φ240 mm, a height (B1) of 140 mm, an inclination angle (β1) of the reinforcing cord 14 of 55 °, and an annular shape embedded in the lower end portion. The bead wires 1, 17 and 18 have an air spring diaphragm with a center diameter (D) of φ160 mm, an outer diameter of the central portion before vulcanization molding of φ216 mm, a height (B) of 170 mm, and an inclination angle (β ) Is set to 48 °.

  The reinforcing cord layer 12 is formed from a single reinforcing cord 14 surrounding the central axis, and a hanging portion 14 a passing through the lower end portion of the cylindrical rubber film 11 is hung on the bead wires 1, 17 and 18. The linear length (H) of the hanging portion 14a is 153 mm from the inclination angle (β = 48 °) and the height (B = 170 mm).

  The reinforcing cord 14 is a rubber-coated cord obtained by coating a polyester cord having a cord diameter of 0.6 mm with unvulcanized rubber, and the cord pitch is 1 mm. The diameter of the reinforcing cord 14 covered with unvulcanized rubber is set to φ1.0 mm.

  The bead wires 1, 17, and 18 in the present invention products 1 and 2 and the conventional products 1 and 2 are all formed by connecting both ends of linear members 3, 8, 19, and 20, which are stranded steel wires subjected to brass plating. It is configured. The configuration of the stranded steel wire is 1 × 2.1 + 6 × 1.0 for the product 1, the conventional product 1 and the conventional product 2, and 3 × 1.2 + (6 × 3) × 0 for the product 2 of the present invention. .5.

  The linear members 3 and 8 of the products 1 and 2 according to the present invention are obtained by drawing the core wires 4 and 6 from the outer peripheral lines 5 and 30 by 30 mm and forming the concave portions 3a and convex portions 3b at both ends. A bead wire 1 is formed by fitting 3b and connecting both ends.

  As shown in FIG. 12A, the linear member 19 of the conventional product 1 is formed by cutting a range of 20 mm at both ends into a taper shape, and connecting both ends by wrapping the taper surfaces. Thus, the bead wire 17 is configured. As shown in FIG. 12B, the linear member 20 of the conventional product 2 uses a stranded steel wire as it is, and wraps the range of 30 mm at both ends as it is to connect to the bead wire 18. Composed.

  Table 1 shows the results of comparing the product of the present invention with the conventional product for the four items of behavior during molding of an unvulcanized rubber film, behavior during vulcanization molding, sealing performance with the piston insertion portion, and durability.

  Table 1 shows that the product of the present invention is superior to the conventional product in all four items. That is, the method of the present invention does not cause misalignment of the bead wire connecting portion, entanglement of the strands, or disturbance of the reinforcing cord when molding the unvulcanized rubber film, and the position of the bead wire connecting portion when vulcanizing and molding is performed. Deviation, opening of both ends, and deformation do not occur, and deterioration of the sealing performance with the piston can be prevented and durability can be improved.

  According to the said structure, since the bead wire 1 is comprised by connecting the both ends of the linear members 3 and 8, the arrangement | positioning of the bead wire 1 to the rubber cylinder 2 can be made easy. In particular, while surrounding the central axis with one or several reinforcing cords 14, the linear members 3, 8 are gradually arranged from the starting end side and arranged on the entire circumference, and then both ends thereof are connected to connect the bead wire 1. By configuring, the reinforcement cord layer 12 can be locked by hanging the bead wire 1 on all the hanging portions 14 a of the reinforcement cord 14.

  Accordingly, the reinforcing cord layer 12 formed by winding one or several reinforcing cords 14 on the rubber cylinder 2 having a one-side seal structure in which a bead wire 1 such as a piston type air spring is essential is adopted. can do. In particular, the piston type is often employed, and the bead wire 1 of the present invention can be suitably used for a small air spring with low strength required for the bead wire 1.

  Since the bead wire 1 is formed from a flexible stranded wire, handling when the linear members 3 and 8 are gradually arranged from the start end side is easy, and when inserting a fitting such as a piston or a tire wheel. It fully follows deformation and quickly restores its original shape.

  Since the concave portions 3a and the convex portions 3b at both ends of the linear members 3 and 8 are fitted and connected, the deviation of both ends is prevented and the outer diameter and the cross-sectional shape of the bead wire 1 are made the same over the entire circumference. The product shape can be made stable and beautiful. Moreover, since the rigidity of the bead wire 1 does not change at all in the connecting portion, the fitting length of the concave portion 3a and the convex portion 3b can be freely selected according to the required tensile strength.

  The linear members 3 and 8 can easily form the concave portions 3 a and the convex portions 3 b at both ends by pulling out the core wires 4 and 6 from the outer peripheral lines 5 and 7. The core wires 4 and 6 can be easily pulled out to about 10 mm to 30 mm, and the twisted outer peripheral wires 5 and 7 sufficiently retain their shapes even when the core wires 4 and 6 are pulled out.

  The tensile strength of the linear members 3 and 8 is sufficient with the strength of only the core wires 4 and 6 or the strength of only the outer peripheral lines 5 and 7, and sufficient tensile strength even at the concave portions 3a or convex portions 3b at both ends. Can be obtained. In addition, in order to improve the fastening shape stability with a metal fitting or to use a lap joint, the conventional bead wire is often a large-sized bead wire.

  Moreover, since the both ends of the linear members 3 and 8 are connected via the rubber | gum which penetrate | invades between the recessed part 3a and the convex part 3b, the fitting length shall be set to about 5 to 10 times the diameter of a core. Thus, the connection can be made with a sufficient tensile strength, and partial deformation due to the force of pulling the bead wire 1 can be prevented.

  In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, the rubber cylinder 2 reinforced by the bead wire 1 as the annular structure according to the present invention is not limited to the diaphragm of the air spring, and may be provided in a tire, an air roller, a pipe joint, or the like. In addition, the reinforcing cord layer of the rubber cylinder may be formed by winding a wide Suda record as well as one formed by one or several reinforcing cords 14 around the central axis.

  The bead wire 1 can be embedded not only at one end of the rubber cylinder 2 in the central axis direction but also at both ends of the rubber cylinder. Furthermore, the annular structure according to the present invention is not limited to the bead wire 1 but is used to reinforce the peripheral edge of the opening of the bag-like rubber member, or to surround and reinforce the central portion of the cylindrical or rod-like rubber member. There may be.

  The linear member may be a stranded wire whose core wire is formed by twisting a plurality of strands. In addition, the linear member is not limited to a stranded wire obtained by twisting outer peripheral wires arranged around the core wire, and may be a member in which a plurality of wires are bundled.

  Further, the core wire only needs to be flexible and have sufficient tensile strength, and instead of a single wire or a plurality of core wires 4 and 6, a tubular wire or a sheet-like material is rounded into a rod shape or a tubular shape. The constructed core wire can be used. Moreover, it can replace with the several outer periphery wires 5 and 7 twisted together, and can also use the flexible sheath formed by rounding a tubular wire and a sheet-like raw material into a tube shape. Also in this case, since the position of the seam of the core wire and the position of the sheath seam when both ends are connected are shifted, the seam of the core wire can be reinforced with the sheath, and the seam of the sheath can be reinforced with the core wire, Swelling around the seam can be dispersed.

It is sectional drawing of the rubber cylinder provided with the bead wire as an annular structure concerning the present invention, the left half shows the state before vulcanization molding, and the right half shows the state after vulcanization molding. Side view of linear member Cross-sectional view of linear member It is a schematic diagram which shows the connection of the both ends of a linear member, (a) shows the state before a connection, (b) shows the state after a connection. Cross-sectional view of another form of linear member Perspective view showing a reinforcing cord layer The perspective view which shows a mode that a reinforcement cord surrounds a central axis Bottom view showing how to place bead wires Bottom view showing how the reinforcing cord surrounds the central axis It is a figure which shows the cylindrical unvulcanized rubber film formed around the molding former, (a) is an axial sectional view, (b) is an axial perpendicular sectional view. Axial sectional view of cylindrical unvulcanized rubber membrane and cylindrical rubber membrane Schematic showing connection of conventional bead wires

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bead wire 2 Rubber cylinder 3, 8 Linear member 3a Concave part 3b Convex part 4, 6 Core wire 5, 7 Peripheral line 5a Strand 12 Reinforcement cord layer 14 Reinforcement cord 14a Hanging part

Claims (8)

An annular structure for reinforcing a rubber member, which is formed into an annular shape by connecting both ends of a linear member, and the concave and convex portions that are fitted to each other are formed at both ends of the linear member. An annular structure characterized in that both ends of the linear member are connected via rubber that has penetrated into the body. An annular structure for reinforcing a rubber member, which is formed into an annular shape by connecting both ends of a linear member, and the linear member is formed by bundling a plurality of wires, and part of the wires An annular structure characterized in that, by shifting in the length direction, concavities and convexities to be fitted to each other are formed at both ends of the linear member. An annular structure for reinforcing a rubber member, which is formed into an annular shape by connecting both ends of a linear member, and the linear member is formed by bundling a plurality of wires, and part of the wires by shifting the lengthwise on both ends of the linear member, is formed is uneven to be fitted with each other, and characterized in that both ends of the linear member via the rubber has penetrated between the unevenness is connected to that ring-like structure. The linear member is composed of a core wire and a plurality of outer peripheral wires arranged around the core wire and twisted together, and the core wire is drawn out from the outer peripheral line to form the irregularities at both ends. The annular structure according to claim 2 or 3.   5. The annular structure according to claim 4, wherein the linear member is a stranded wire in which at least one of a core wire and an outer peripheral wire is formed by twisting a plurality of strands.   The annular structure according to any one of claims 1 to 5, wherein the linear member is subjected to a surface treatment for improving adhesion to rubber.   A rubber cylinder formed by providing a reinforcing cord layer on a cylindrical rubber film is embedded in at least one end in the central axis direction, and is a bead wire that locks the end of the reinforcing cord layer. The annular structure according to any one of claims 1 to 6, wherein The reinforcing cord layer is inclined with respect to the central axis direction so as to pass through both end portions of the rubber cylinder, and the reinforcing cord surrounding the central axis is shifted by a predetermined pitch in the circumferential direction for each winding. Is arranged in the circumferential direction,
The annular structure according to claim 7, wherein the reinforcing cord is a bead wire that is arranged so as to be hung on a portion passing through an end portion of a rubber cylindrical body, and locks the reinforcing cord layer.

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