JP2706066B2 - Method for manufacturing tread element of non-metal tire chain - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tread element of a ladder type nonmetallic tire chain to be mounted on an automobile tire. 2. Description of the Related Art Generally, a rudder type nonmetal tire chain has a structure in which a plurality of tread elements are arranged in parallel at a predetermined interval, and both ends of each tread element are connected by side ropes. ing. This tread element has a flat band shape or a mountain shape in which a reinforcing core material is embedded in a coating layer of rubber or synthetic resin. In a conventional tread element, one or more reinforcing core materials are used. The end portion is connected to a locking member such as a ring by using a strip wire (for example,
JP-A-62-129306, JP-A-62-145
806). [0003] The conventional tread element uses a string-like material such as a wire as a reinforcing core material, so that the tread element becomes relatively thick and has flexibility in the vertical direction. In addition to this, there are disadvantages that the bending rigidity in the lateral direction is small and that the reinforcing core material is easily deteriorated due to stress concentration. [0004] Further, the wire has a complicated structure of the connecting portion between the terminal portion and the locking member, and therefore has a disadvantage that the connecting terminal portion of the wire is easily separated or cut. Also,
Since the spike pins must be buried in a position that does not overlap with the wire, the arrangement position is limited, and the service life is shortened due to early wear of the coating layer. [0005] Furthermore, the process for connecting the terminal portion of the wire to the locking member is complicated and requires a lot of labor, which is one of the causes of a reduction in manufacturing efficiency. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a tread element of a non-metallic tire chain which eliminates the above-mentioned disadvantages, has a high performance and a long life with a simple structure, and can be manufactured at a high efficiency and at a low cost. According to the method of manufacturing a tread element of a non-metallic tire chain of the present invention, a longitudinal cord is used as a reinforcing layer, and both ends in the longitudinal direction are connected to a tread hook in advance. Prepare a reinforced core material. [0007] After setting a spike pin at a predetermined position of a lower mold having a concave mold for molding the front half of the tread element, a transfer mold for the lower mold having a convex mold for charging the front half of the reinforcing core material is formed. After injecting the combination, a molding material such as a rubber material or a synthetic resin into the lower mold, the lower mold transfer mold is separated from the lower mold. In parallel with or before or after this, an upper mold having a concave mold for molding the back half of the tread element is combined with a transfer mold for the upper mold having a convex mold for charging the back half of the reinforcing core material. Then, after injecting a molding material such as a rubber material or a synthetic resin into the upper mold, the upper mold transfer mold is separated from the upper mold. Next, the reinforcing core material is set in the reinforcing core material charging portion formed in the molding material filled in the lower mold. Subsequently, the upper mold filled with the molding material is combined with the lower mold and heated under pressure. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of a nonmetal tire chain provided with a tread element according to the present invention. In FIG. 1, reference numeral 10 denotes tread elements arranged at appropriate intervals, and reference numerals 20 and 21 denote side ropes to which the tread elements 10 are connected. As shown in FIGS. 2 and 3, the tread element 10 has a belt-shaped reinforcing layer 12 on both sides covered with a coating layer 14, and tread hooks 13 joined to both ends in the longitudinal direction of the reinforcing layer 12. 11, a cushioning material 18 is provided between the spike pins 16 buried on the surface side of the covering layer 14 and the reinforcing layer 12. As the reinforcing layer 12 of the reinforcing core material 11, a cord material of a blind weave used as a tire cord cut into a predetermined size is used. This reinforcing layer 12 is 1
Layers or a plurality of layers as required, and both ends in the longitudinal direction thereof are folded back around the reinforcing layer winding portion 13a of the tread hook 13 as shown in FIG. is there. As the connection structure between the reinforcing layer 12 and the tread hook 13, an appropriate one of the ply lock methods shown in FIGS. 5 (a) to 5 (e) can be adopted. Both sides of the reinforcing layer 12 are wrapped around the reinforcing layer 1 of the tread hook 13
Coating layer 14 covering both the winding terminal portion bonded to 3a
Is formed of rubber or synthetic resin. The covering layer 14 is formed such that the embedding position of the reinforcing layer 12 is made deeper so that the thickness of the front half of the reinforcing layer 12 is larger than that of the rear half of the reinforcing layer 12. The thickness is secured. The cushioning material 18 interposed between the spike pins 16 and the reinforcing layer 12 is not always necessary, but when used, a sheet of rubber material, canvas material, synthetic resin material or the like is used. The tread element 10 has side tread hooks 13b buried at both ends in the longitudinal direction of the tread element 10, and the side ropes
A set of non-metallic tire chains is formed by connecting to 0 and 21 by caulking. FIGS. 6 and 7 show another example of the tread element of the non-metallic tire chain according to the present invention, which has a mountain shape in which both end portions in the longitudinal direction of the tread element are bent in the same direction. The constituent members are the same as those shown in FIGS. 2 and 3, and therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted. Next, a method for manufacturing the tread element of the non-metal tire chain of the present invention will be described. FIG.
FIG. 3 shows a method of manufacturing the flat strip tread element shown in FIGS. 2 and 3 in the order of steps. The lower mold 30 and the lower transfer mold 35 shown in FIG.
And an upper mold 40 and an upper mold transfer mold 45 shown in FIG. 8 (b). The lower mold 30 is provided with a concave mold 31 for molding the front half of the tread element, and the lower mold transfer mold 35 is provided with a reinforcing core (see FIG. 4) in which a reinforcing layer is connected to a tread hook. 3) is provided with a convex half 36 for charging the front side half. The upper mold 40 has a concave mold 41 for molding the rear half of the tread element, and the transfer mold 45 has a convex mold 46 for charging the rear half of the reinforcing core material. Is provided. In manufacturing the tread element,
A reinforcing core material 11 in which the reinforcing layer 12 previously described with reference to FIG. 4 is bonded to the tread hook 13 is prepared, and a buffer material 18 is adhered to a predetermined position (spike pin embedding position) on the surface of the reinforcing layer 12. deep. First, the shank 16a of the spike pin 16 is inserted and set in the spike pin mounting portion 31a provided in the concave mold 31 of the lower mold 30, and as shown in FIG. And a molding material such as unvulcanized rubber or molten synthetic resin is injected from an injection nozzle 37 of the lower mold transfer mold 35, and the molding material 32 is filled in the concave mold 31 of the lower mold 30. Then, the lower mold transfer mold 35 is separated from the lower mold 30. As shown in FIG. 8B, in parallel with or before this, the upper mold transfer mold 45 is combined with the upper mold transfer mold 45, and the unvulcanized rubber or unvulcanized rubber is injected from the injection nozzle 47 of the upper transfer mold 45. A molding material such as a molten synthetic resin is injected, the molding material 42 is filled into the concave mold 41 of the upper mold 40, and the upper mold transfer mold 45 is separated from the upper mold 40. Next, as shown in FIG. 8C, a reinforcing core material charging portion (not shown) formed in the molding material 32 in the lower mold 30 by the convex 36 of the lower mold transfer mold 35. After the reinforcing core material 11 is charged and set, the lower mold 30 is combined with the upper mold 40 filled with the molding material 42 as shown in FIG. 8 (d). The lower mold 30 and the upper mold 40 thus combined are heated under pressure to cure the molding materials 32, 42 filled in the molds 30, 40, and then released. Then, the tread element of the present invention is obtained. In the above steps, the reinforcing layer 1 of the reinforcing core 11
2 instead of sticking the cushioning material 18 to the reinforcing core 1
1 and the cushioning material 18 are separately prepared, and the lower mold 30 is prepared.
The cushioning material 18 and the reinforcing core material 11 may be set in the molding material 32 in another process. Note that the mountain-shaped tread element shown in FIGS. 6 and 7 also uses a pair of upper and lower molds having a mountain-shaped concave shape and a pair of upper and lower transfer molds combined with this mold. It can be manufactured by exactly the same process. Also, the tread element of the present invention
Not limited to the above type, the same configuration as described above can be applied to a type in which a pair of flat belt-shaped tread elements are arranged in parallel and connected by an intermediate member. As described above, according to the present invention, since the reinforcing layer is a cord-shaped cord material, the process for connecting both ends to the tread hook is extremely simple. Therefore, the processing time and man-hours for the reinforcing core material are greatly reduced, and in particular, since the reinforcing layer can utilize the waste of the tire cord used as a carcass of the tire,
A highly efficient and inexpensive manufacturing method is obtained. Further, the tread element manufactured by the method of the present invention has a structure in which the interdigitated cord material is connected to the tread hook, so that the tread element is relatively thin, so that the flexibility in the vertical direction and the flexibility in the lateral direction are obtained. Not only does the structure have a large bending rigidity, but also the deterioration due to stress concentration of the reinforcing layer is reduced. In addition, since the reinforcing layer that is connected to the tread hook can be wound back and wound around the cord-shaped cord material, the connecting structure is simplified, and the connecting end portion of the reinforcing layer may be separated from the tread hook or cut. Less. Further, the most suitable position of the spike pins can be selected irrespective of the position of the reinforcing layer, so that the wear of the covering layer is reduced and the device can be used for a long time. In addition, when the cushioning material is used, in addition to the above-described effects, the non-metal tire chain having high performance and long life can be obtained in combination with the fact that the reinforcing layer is prevented from being damaged by the spike pins.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a nonmetal tire chain including a tread element manufactured by the method of the present invention. FIG. 2 is a plan view of a tread element. FIG. 3 is a side view of the tread element. FIG. 4 is a perspective view of a reinforcing core material. FIG. 5 is a side view showing several examples of a coupling mechanism between a reinforcing layer and a tread hook. FIG. 6 is a plan view showing another form of the tread element. FIG. 7 is a side view of the tread element of FIG. 6; FIG. 8 is a side view showing a manufacturing process of the tread element of FIG. 2; DESCRIPTION OF SYMBOLS 10 Tread element 11 Reinforcement core material 12 Cord material (reinforcement layer) 13 Tread hook 14 Covering layer 16 Spike pin 30 Lower mold 31 Recessed mold 32 for molding the surface side half of tread element 32 Filled molding material 35 Lower mold transfer mold 36 Convex mold 40 for charging the front half of reinforcing core material Upper mold 41 Concave mold 42 for molding the front half of tread element Filled molding material 45 Transfer mold 46 for upper mold Reinforcement core material Convex type for charging the back half

Continued on the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical display location B29K 105: 24 B29L 31:12

Claims (1)

(57) [Claims] In advance, prepare a reinforcing core material in which the cord-shaped cord material is used as a reinforcing layer and both ends in the length direction are connected to a tread hook, and are provided at predetermined positions of a lower mold having a concave mold for molding the surface side half of the tread element. After setting the spike pins, combine the transfer mold for the lower mold with the convex mold for the front half of the reinforcing core material, inject the molding material such as rubber or synthetic resin into the lower mold, and then mold the lower mold The transfer mold for the lower mold is separated from the upper mold and the upper mold having the concave mold for the rear half of the tread element and the convex mold for charging the rear half of the reinforcing core material are provided in parallel or before and after this. Combine the upper mold transfer mold, inject molding material such as rubber or synthetic resin into the upper mold, and then transfer from the upper mold to the upper mold transfer. After separating the mold and setting the reinforcing core material in the reinforcing core material charging portion formed in the molding material filled in the lower mold, the lower mold is filled with the molding material. A method for producing a tread element of a nonmetal tire chain, comprising combining a mold and heating under pressure.