JPH068014B2 - Method of manufacturing anti-skid device for tire - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a non-slip member for a tire which is lapped around an automobile tire and used.

(Prior Art) When traveling on a snowy or frozen road surface, a non-metal tire slipper having a large number of mesh portions such as a ladder type or a hexagonal type has recently attracted attention in place of a metal chain.

As a conventional method for manufacturing a non-metal tire slip stopper, there are those proposed in Japanese Examined Patent Publication No. 58-13337 (1 of the conventional example) and Japanese Examined Patent Publication No. 58-49366 of the present invention (2 of the conventional example). .

That is, in the conventional example 1, a groove for obliquely forming a mesh is formed on the surface of the press die, a plastic coating material such as synthetic rubber is accommodated in the lower part of the groove, and then a cord-shaped core is placed on the groove. A material is stretched around the groove as a guide to form a mesh in the press die,
Further, the above-mentioned mesh is filled with the plastic coating material, press-molded, and simultaneously vulcanized.

Further, in the conventional example 2, a diagonal groove-like groove for forming a mesh is formed on the surface of the press die, and a cord-like core material coated with a plastic coating material is stretched in the groove to press the die. The mesh is formed inside, and then this is formed integrally by molding.

(Problems to be Solved by the Invention) By the way, both of the conventional examples 1 and 2 have been recognized as having a certain degree of usefulness by solving the drawbacks of the one in which the core material is knitted in a mesh shape by a Russell knitting machine, for example. However, since a cord-shaped core material is stretched around a press die to form a mesh in the die, the vulcanization of rubber partially progresses during molding, resulting in deterioration of product physical properties, It took time to.

That is, since the press die is in a heated state, in the second and subsequent moldings, since the core material is in a heat saving state to stretch the core material around the press die, the press die must be cooled once, If this cooling is insufficient, vulcanization of the rubber may partially proceed, and it takes a considerable time to sufficiently cool the press die, and the time loss in the entire process is large. There was a problem in terms of productivity.

The present invention has been devised in order to solve the problems while securing the usefulness of the conventional examples 1 and 2, and a large number of predictions are made before loading into the press die. A net having a mesh is formed in advance, and this net is loaded into a press die and press-formed.

(Means for Solving Problems) That is, the technical means taken by the present invention to solve the problems is a cord-like or rod-like shape formed by coating the unvulcanized rubber 13 around the core 12. When the net forming material 33 is stretched around the mesh forming engaging portion 32 on the preforming table 31 and the net 35 having a large number of mesh portions 34 is braided in advance, the net forming material 33 is attached to the main body portion 9 of the antiskid 8. The core material 12 of the net constituent material 33 corresponding to the corresponding axial lug portion 14 is laid side by side in parallel with the plate surface of the preforming table 31 in the axial direction without crossing each other, and the braided net 35 Is released from the preforming table 31 and then fitted into the molding grooves 38 of the vulcanizing press dies 37 and 39 for hot press molding.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. First, a structure of a non-slip member and a means for mounting the tire on a tire, which is a target of a manufacturing method thereof, will be described.

In FIGS. 14 to 18, particularly FIGS. 17 and 18, reference numeral 1 denotes a tire, which has a tread portion 2, both shoulder portions 3, both sidewall portions 4 and both bead portions 5 and has a toroidal cross section. The bead portion 5 is fitted on the bead seat of the rim 6.

In addition, 7 has shown the disk.

In FIG. 14, reference numeral 8 denotes a non-slip member manufactured in the present invention in a band shape in a deployed state, which is located on the tread portion 2, the main body portion 9, both shoulder portions 3 and both sidewall portions 4 It has both side edges 10 and 11 respectively located at.

As shown in FIGS. 15 and 16, the slip stopper 8 is covered with a covering material 13 made of a non-metallic material having elasticity on a core material 12,
The core material 12 extends in a net shape.

The core material 12 is made of a synthetic fiber such as polyester, nylon or rayon or a natural fiber in a mesh shape, and the covering material 13 coated on the core material 12 is made of rubber, synthetic resin or other non-metallic material having elasticity, It may be a mixture of short fibers (glass fiber or the like) if necessary. The core material 12
May be a rubber-coated cord, and in any case, it is desirable that the cord has no stretchability (non-stretchability).

As shown in FIG. 14, the main body portion 9 is provided with a row of axial lug portions 14 which are spaced in the circumferential direction of the tire 1 and are parallel to the axial direction of the tire 1. Direction) is provided as a continuous arrangement.

Corresponding to the shoulder portion 3 and sidewall portion 4 by continuously provided by the oblique direction lug portion 16 and the axial lug portion 16 _A column set in the oblique direction in the axial direction the lug 14 on the side edges 10 and 11 In this example, the hexagonal (turtle-shaped) mesh-like portions 17 and 18 are provided in a continuous manner in the circumferential direction (longitudinal direction of the belt).

Here, regarding the crossing angles A, B, and C of the mesh portions 15, 17, and 18 in the tire axial direction, the angle A of the main body portion 9 is the smallest, and the relationship is A <B <C.

Each of the hexagonal mesh-shaped portions 15, 17, 18 is a main body 9
It is the largest and the amount of deformation in the circumferential direction is large,
The mesh portion 17 on the shoulder portion 3 is enlarged next to suppress the deformation in the circumferential direction to some extent, and even when the vehicle bends, the deviation from the tire 1 is suppressed to prevent slippage, and the outermost portion The mesh portion 18 is minimized to minimize the amount of deformation in the circumferential direction, and the slip stopper 8 is prevented from coming off.

In addition, the cross-sectional shape of the lug portion described above is a substantially trapezoidal shape in which the tire surface side is wide and the non-tire surface side is narrow.

Reference numeral 19 is a connecting lug having a trapezoidal cross section,
As shown in the figure, it has a connecting hole 20 and is connected to each other by a connecting fitting 21 having a hook that can be engaged with and disengaged from the connecting hole 20, and the connecting hole 20 and the connecting fitting 21 constitute a connecting means 22. There is.

Although the connecting means 22 is provided corresponding to both the shoulder portions of the tire, it may be provided corresponding to the tread portion.

Reference numeral 23 is a side rope, and as shown in FIG. 18, it is located on both outer sides of the rim 6, and the rope ends are connected to each other as shown in FIG.
It is connected so that it can be separated.

The side ropes 23 and the mesh portions 18 of the side edge portions 10 and 11 are connected to each other inside and outside in the radial direction by the connecting members 25, so that the slip stopper 8 is mounted on the tire 1.

In addition, in FIG. 14, FIG. 16 and FIG. 18, 26 indicates a spike tool, and as shown in FIG. 16, it has a collar portion 27, a body portion 28 having a smaller diameter than this, and an insertion portion 29. As shown in FIG. 14, it is provided on both sides of the axial lug portion 14 and the like.

Further, reference numeral 30 is a mounting hole, which is penetrated by the connecting lug 19 and is used to mount one end of the connecting tool 25 in a system detachable manner.

The anti-skid device 8 described above is manufactured as follows.

In FIG. 1, 31 is a pre-molding table (hereinafter, simply referred to as a molding table), which is not provided with a heating source,
It has an engaging portion 32 for molding the above-mentioned hexagonal mesh portions 15, 17, 18 and the like.

That is, in this embodiment, the engaging portion 32A corresponding to the axial lug portion 14, the engaging portion 32B corresponding to the diagonal lug portion 16, the engaging portion 32C corresponding to the axial lug 16A, and the connecting rib 19 are provided. In this example, the engaging portion 32D is formed as a groove structure, and the cord-like or rod-like net constituent material 33 in which the core material 12 is covered with the coating material 13 for end vulcanization is the engaging portions 32A to 32D. A net 35 having a plurality of mesh portions 34 corresponding to the mesh portions 15, 17, 18 of the anti-skid 8 is stretched on the preforming table 31.

In this case, as shown in FIG. 2, even if the engaging portion 32 fits the two net constituent materials 33 into one groove and stretches them around, as shown in FIG. Even if it is fitted in the groove and stretched around, further, for example, in the cross portion 35 shown in FIG. 1, two net constituent materials 33 are fitted in the groove in two steps as shown in FIG. It may be stretched in a crossed state.

In any case, one or a plurality of net constituent materials 33 are stretched around the engaging portion 32 shown by the groove of the molding table 31 in the first embodiment, and at a proper position of the parallel portion or the cross portion, for example, FIG. The tape 36 shown in FIG. 6, the adhesive 37 shown in FIG. 6, the stoppers 38 shown in FIG. 7 and the like are joined together, and are formed on the forming table 31 so that the mesh portions 34 of the net 35 do not come apart from each other. is there.

In this case, the tape 36 may be only a rubber tape, but may be a thin unvulcanized rubber sheet attached to a fiber such as nylon or polyester, and an adhesive is applied to a part of the covering material 13 and pressed with a tool or the like. And glued together,
In short, each mesh portion 34 of the net 35 stretched around the molding table 31
As long as they are formed by the forming table 31 so that they do not come apart from each other. The point is that when the net 35 having a large number of mesh portions 34 is braided in advance, the main body portion 9 of the anti-skid device 8 shown in FIG. Of the net constituent material 33 corresponding to the axial lug portion 14 in
As shown in FIG. 1, 12 are braided in parallel on the plate surface of the molding table 31 so as to be parallel to the axial direction without crossing each other.

Further, the engaging portion 32 of the molding table 31 has a groove shape in the embodiment shown in FIGS. 1 to 4, but the mesh portions 15, 17, 18 are formed as shown in FIGS. 8 and 9. The engaging portion is formed by screwing or driving the protrusion 40 on the molding table 31 so that the engaging portion can be formed.
32 may be configured.

In the case of the engaging portion 32 shown by the protrusion 40, the net constituent material 33 is stretched around to form the mesh portion 34 as shown in FIG. 8, and the parallel portion or the cross portion is formed as shown in FIGS. They are combined in the same way as illustrated.

Further, the engaging portion 32 may be a combination of a groove and a protrusion as shown in FIG.

In any case, the net forming material 33 is stretched around the forming table 31 to form the net 35 having the mesh portion 34 corresponding to the shape of the anti-skid 8, and after the net 35 is removed from the forming table 31, As shown in FIG. 11, a net 38 is formed in the forming groove 38 of the press die 37 corresponding to the shape of the anti-skid 8 as shown in FIG.
35 is charged and set, and then the upper press die 39 is clamped as shown in FIG.
As shown in FIG. 13, each rib portion having a trapezoidal cross section is integrally molded, and the driving holes for the spikes 26, the mounting holes 20, 30, etc. are formed by the pins 39A formed on the upper mold 39.

In this hot press molding, the axial lug portion 14 of the main body portion 9 of the slip stopper 8 is located in the tread portion of the tire and exerts the most anti-slip effect, so that the core material 12 is exposed or the core material 12 is formed. When the coating thickness is thin, the core material 12 is often damaged or broken early.

However, in the preforming in the part corresponding to the lug portion 14, the core material
Since 12 is not parallel to each other and is not crossed (including the vertical weight), it is possible to prevent the core material 12 from being exposed and the coating thickness being thin and even when vulcanizing and press-molding. is there.

After press molding, it is removed from the press die as usual. Note that the net constituent material 33 may have a trapezoidal shape other than a circular shape, an elliptic shape, or a quadrangular shape as long as the core material 12 is covered with the coating material 14 of unvulcanized rubber.

Further, the shape of the groove 38 of the press die 37 is determined by the cross-sectional shape of each lug portion in the anti-skid 8, and the shape of the engaging portion 32 of the molding table 31 is also the anti-slip to be manufactured. It is set according to the mesh shape of the tool 8. Therefore, the shape, arrangement, etc. of the mesh portion 34 may be other than those shown in the drawing.

(Effects of the Invention) The present invention is as described above, and has the following advantages.

In any of the conventional examples, since the cord-shaped net constituent material is stretched around in the press die to form the mesh in the press die, the press die is mostly under the heat saving condition, When stretched under this heat storage condition to form a mesh,
Partial vulcanization occurs, and the physical properties of the manufactured anti-skid device may deteriorate in each part, so that each part cannot be made into a uniform anti-skid device. Since the net-constituting material is stretched around the preforming table to form a net having a mesh, each part of the manufactured anti-slip device can have uniform physical properties.

Further, in the conventional example, since the mesh is formed by the press die, a sufficient cooling period of the press die is indispensable, which becomes a factor of time loss in manufacturing, whereas in the present invention, the net having the mesh is formed on the forming table. After that, it is charged into the press die and integrated into one body, so that it is not necessary to consider cooling on the forming table and the productivity can be greatly improved.

Further, the forming table has a mesh forming engaging portion, and the net forming material can be engaged and held by the engaging portion to form the net according to the standard. The net thus formed is mounted on the press die. Since it is to be put in, it is possible to make a large number of nets in advance with a molding table and then load this into a press die, or to stock so-called nets.

Further, when the net forming material is pre-braided on the preforming table, the core material of the net forming material in a portion corresponding to the axial lug portion of the anti-skid body does not cross each other and is parallel to the plate surface of the forming table. Since it is set up and braided,
When this net is hot-pressed, there is an advantage that the core material is hardly exposed and the coating thickness of the core material is unlikely to occur, and damage and breakage of the core material can be prevented and durability can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of a molding table used in the method of the present invention, FIGS. 2 to 4 are enlarged cross-sectional views showing three examples indicated by arrows ZZ in FIG. 1, and FIG. FIG. 7 is a cross-sectional view showing three examples of the connecting portion of the net constituent material, FIG. 8 is a partial plan view showing another example of the forming table, and FIGS. 9 and 10 are taken along line ZZ of FIG. Arrow 2
An enlarged cross-sectional view showing an example, FIG. 11 is a plan view showing an example of a press die (lower die), FIG. 12 is a cross-sectional view showing a state in which a net is loaded in the press die (lower die), and FIG. 13 is A sectional view showing the molding in a press die, FIG. 14 is a partial plan view showing the usage state of the manufactured anti-skid, and FIG. 15 is a sectional view taken along line XX of FIG. FIG. 16 is a sectional view taken along the line YY of FIG. 14, FIG. 17 is a partial front view showing an example in which the anti-skid device manufactured according to the present invention is mounted on a tire, and FIG. It is an expanded sectional view of a line arrow. 8 ... Anti-slip device, 31 ... Forming base, 32 ... Engagement part, 33 ... Net constituent material, 34 ... Mesh part, 35 ... Net, 39 ... Press type.

Claims (1)

[Claims] 1. A cord-like or rod-like net constituent material (33) formed by covering a core material (12) with unvulcanized rubber (13).
When the net (35) having a large number of mesh portions (34) is pre-braided by stretching it along the mesh forming engagement portion (32) on the preforming table (31), the slip stopper (8 The core material (12) of the net constituent material (33) corresponding to the axial lug portion (14) corresponding to the body portion (9) of FIG.
Braided by arranging them parallel to the plate surface of the preforming table (31) in the axial direction without crossing each other and releasing the braided net (35) from the preforming table (31). Sulfur press type
A method for manufacturing a tire anti-skid, comprising fitting into the molding grooves 38 of 37 and 39 and performing hot press molding.