JPS62273108A - Anti-skid device for tire - Google Patents

Abstract

PURPOSE:To prevent the distortion of a frame body of an anti-skid device, which is formed by assembling frame bodies made of elastic material, by burying a short fiber in at least one part of the main body. CONSTITUTION:The main body 20 of a anti-skid device 10 for a tire is formed with a tire-side rubber layer 19A and a road-surface-side rubber layer 19B. A short fiber 21 made up of natural cellulose fiber is buried in the tire-side rubber layer 19A so that both rubber layers 19A and 19B are integrated into one body. By burying a short fiber in a part of the main body, distortion of the frame can be prevented.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a tire anti-slip device that is attached to the outer periphery of a tire and prevents the tire from slipping when a vehicle moves.

BACKGROUND TECHNOLOGY AND ISSUES TO BE SOLVED] A metal chain attached to the outer circumference of a tire is generally used as a vehicle tire anti-slip device used during snowy conditions. However, metal chains are complicated to install, make a lot of noise when the vehicle is running, and have the disadvantage that the chain hits the vehicle body while the vehicle is running, causing damage to the vehicle body.

In order to eliminate this drawback, a slip-correcting device has been proposed in which a reinforcing cord is enclosed within the anti-slip device body made of rubber, synthetic resin, etc., which consists of a set of frames forming a rhombus or tortoise-shell shape. . High tension reinforcement cords such as nylon and polyester fibers are used.

A material with low extensibility is used.

However, such conventional tire skid devices have the disadvantage that the slip that occurs between the tire and the skid device causes a relatively large twist in the frame, leading to uneven wear and premature failure. Ta.

The present invention takes the above facts into consideration and aims to provide a tire slip prevention device that can reduce twisting of the frame.

[Summary and operation of the invention] In the tire slip prevention device according to the present invention, short fibers are embedded in at least a portion of the main body made of a set of frames.

For this reason, the short fibers increase the torsional rigidity of the main body, and the torsion of the frame is reduced.

Embodiment 1 of the Invention FIG. 1.2 shows a tire slip prevention device 10 according to a first embodiment of the invention. This tire anti-slip device Ht
o is a reinforcing cord 12 for forming an outer frame as shown in FIG.
14 and reinforcing cords 16 and 18 for forming the small frame are embedded in the rubber main body 2G. This reinforcing cord can be made of synthetic resin such as nylon or polyester fiber, or a metal cord.

The main body 20, as its cross section is shown in the fourth @, is composed of a tire side rubber fit 9A and a road side rubber fi 19B. Short fibers 21 made of natural cellulose m fibers are embedded in the rubber calendar 19A on the tire side. Rubber F319A and rubber M19B are completely integrated.

The main body 20 has a continuous hexagonal shape in the direction of the arrow 1.
It is designed to be wrapped around the outer circumference of a tire (not shown). Further, a rubber protrusion 22 extends from the tip of the hexagonal shell of the main body 20 in a direction perpendicular to the direction of arrow A, and a mounting hole 24 is drilled into this protrusion 22. This mounting hole 24 is for inserting a mounting wire, a hook, etc. (not shown) when mounting the tire on the tire.

To explain the arrangement shape of the reinforcing cords in this embodiment, the reinforcing cords 12.14 for forming the outer frame pass only inside the outer frame portion 20A of the main body 20, and the reinforcing cords 12.14 for forming the outer frame are the same. They are arranged periodically in the form of a sine curve. At the maximum amplitude part of this sine curve, the mounting hole 2
We are proceeding by bypassing 4. Further, at the minimum amplitude portion of the sine curve, the reinforcing cords 1', 2, and 14 for forming the outer frame are arranged to intersect with each other.

A reinforcing cord 16 for forming a small frame is provided in a pair of first small frame portions 20B that are similar in shape to the outer frame portion 20A and have a small hexagonal shape within the outer frame portion 20A, and partially overlap with the outer frame portion 20A.
18 are arranged. These reinforcing cords 16.18 for forming a small frame are also arranged inside the main body 20 in a sine curve shape like the reinforcing cords 12.14 for forming an outer frame, but their amplitude is different from that of the reinforcing cords 12.18 for forming an outer frame. Smaller than 14.

And the period is about 1/2 of the reinforcement cord for outer frame formation 12.14
It becomes.

Therefore, these reinforcing cords 16° 18 for forming the small frame are the reinforcing cords 12 for forming the outer frame. , 14 and their intermediate points as they intersect with each other.

Therefore, the first small frame portion 20B forms a pair of hexagonal portions inside the outer frame portion 20A, and the remaining portions of these first small frame portions 20B are formed into a diamond-shaped second small frame portion 20 within the main body 20.
It is set as C. This 1g2 small frame portion 20C is formed so that a portion overlaps with the first small frame portion 20B and another portion overlaps with the outer frame portion 20A.

A large diameter portion 26 is formed in a portion of the main body 20, and a spike 28 is embedded within this large diameter portion 26.

The spike 28 has a cylindrical shape as shown in FIGS. 5 and 6, and protrudes slightly toward the road surface side end of the large diameter portion 26 to serve as a ground contact portion. In addition, the opposite side of the spike 28 to the road surface, that is, the tip part buried in the large diameter part 26 is a large diameter flange part 30 to prevent it from coming off from the main body 20. There is a sail 1 inside the main body 20.
A32 is buried and serves to prevent the spikes 28 from coming out on the side opposite to the road surface.

Since the spikes 28 are attached to the main body 20 in this manner, the spikes 28 are pushed downward in FIG. 5 when driving on a dry road, and the bottle at the tip is in a retracted state. In this case, the lower rubber surface will bulge toward the tire. Also, when driving on snow, the pins will stick out as in the molded state.

Therefore, problems such as damage to the dry road surface and generation of dust caused by spikes do not occur.

The total height of the spikes 28 in this example is 8 m+s,
The diameter D2 is 5I, and the flange diameter is 8■. Further, regarding the relationship between the spike 28 and the outer diameter D3 of the main body large diameter portion 26, it is preferable that the outer diameter D3 is (2 to 2.5) times the diameter D1.

On the other hand, as shown in FIG. 6.7, it is preferable that the spike 28 is provided with a hook portion 38 at the flange portion 30. This hook portion 38 is a protrusion that protrudes from the outer peripheral end of the flange portion 30 toward the road surface. Yes.

A plurality of sides are provided around the flange portion 30.

For this reason, these hooks 38 bite into the main body 20 when a force is applied in the direction of pulling them out from the main body 20, and the spikes 28
to ensure that it does not come off.

In the cross section shown in FIG. 5, the reinforcing cord 12 for forming the outer frame and the reinforcing cord 16 for forming the small frame are arranged on the road surface side with respect to the flange portion 30 with the spikes 28 attached. . Therefore, when the spikes 28 receive a force that pulls them out toward the road surface, these outer frame-forming reinforcing cords 12. A reinforcing cord 16 for forming a small frame corresponds to the seven rungs 30 and prevents it from coming off. Therefore, in addition to the hook portion 38 of the flange portion 30, the spike 28 is more securely prevented from coming off. These reinforcing cords 12° for forming the outer frame and the reinforcing cords 16 for forming the small frame are not limited to both sides of the spike 28 as shown in FIG. 5, but may be placed together on one side of the spike 28.

The spikes 28 are appropriately installed in the necessary parts of the main body 20, but depending on where the spikes 28 are installed, the spikes 28
There are cases where the reinforcing cord is not placed on both sides of the flange 30, but the reinforcing cord can be placed only on one side as long as it is buried on the road surface side of the flange 30. Also, the reinforcing cord can be wrapped around a spike and shaped into a loop. You may also do so.

Next, the manufacturing procedure of the tire slip prevention device 10 in this embodiment will be explained.

Rubber 819A is made by first kneading a compound of the ingredients shown in Table 1 below in a small Banbury mixer to produce unvulcanized rubber with a volume fraction of short fibers 21 of 0.1. This unvulcanized rubber is rolled with a roll to a thickness of 1.5 mm to produce a sheet 50 in which the short fibers 21 are oriented in the rolling direction (see Fig. 8).Furthermore, as shown in Fig. 8, A sheet 5 with a thickness of 3 cm, which is made by gluing together two sheets of this sheet) 50 and oriented at an angle of ±50' in the orientation direction of the short length am21 with respect to the longitudinal direction (corresponding to the outer circumferential direction of the tire).
2 is made. Finally, the sheet 52 is punched out with a cutter to produce the hexagonal shaped molded product. Short fiber 21
The orientation direction ±50'' corresponds to the inclination angle of the oblique side with respect to the longitudinal direction of the hexagonal shape.

The reinforcing cords 12.14 and the reinforcing cords 16.18 for forming a small frame are stretched over this molding in the above-described arrangement. Furthermore, on top of this, a hexagonal-shaped molded product (rubber layer 19B) is made by punching out an unvulcanized rubber sheet of tire tread rubber compound with a thickness of 5 mm using the same cutter as above.
are glued together and preformed.

Both of these preformed molded products are placed in a mold provided with a concave groove and vulcanized to obtain the tire slip prevention device main body 20.

Incidentally, the spikes 28 are arranged on the main body 20 by appropriate means.
COo) product name “5ANTOWE
BD)J The resorcin derivative (methylene acceptor) tire anti-slip device made from natural cellulose fibers and used to strengthen the bond with the rubber matrix during rubber vulcanization has a rubber layer 19A in contact with the outer peripheral surface of the tire during use. attached, mounting hole 2
Wires, hooks, etc. (not shown) are attached to 4 and mounted on the outer circumference of the tire. The symbol T shown in FIG. 1 is the main body 2.
0 shows the corresponding position of the tire shoulder when it is attached to the tire.

The mounting force acting on the mounting hole 24 is the outer frame portion 20A.

Since the first small frame portion 20B has a hexagonal shape, it applies appropriate tension. As a result, the tire anti-slip device 10 reliably comes into close contact with the outer periphery of the tire.

When the vehicle is running, the road-side surface of the main body 20 and the protruding portions of the spikes 28 serve as ground contact surfaces to prevent the tires from slipping. Particularly, the 20D part of the rudder, which is placed perpendicular to the running direction, has a high pitching force.
6. The main body 20 is a combination of large and small hexagonal shapes that are effective in improving braking force, so the difference in level around the tire outer circumference is small, and vibrations during running are small.

As already explained, the hook portion 38 of the spike 28 reliably engages with the main body 20, and the reinforcing cord is placed on the road surface side of the flange portion 30 to prevent the spike 28 from slipping out. It will not fall off from the main body 20.
Further, since the canvas 32 is arranged on the side opposite to the road surface of the flange portion 30, the spikes 28 are prevented from sinking toward the tire.

In place of the canvas 32, other pull-out prevention materials can also be used, such as stacking two tire blind cords to achieve the same effect as the canvas 32.

In this embodiment, the tire running direction with respect to the tire anti-slip device 110 is the direction of arrow A, and the longitudinal direction of the outer frame portion 20A is inclined with respect to this, so that the prying force acting on the spikes 28 is applied to the outer frame portion 20A. It acts in a diagonal direction with respect to the longitudinal direction, and has a great effect of preventing the spikes 28 from coming off.

In addition, the main body 20 has an outer frame portion 20A and a tortoiseshell-shaped small frame portion 20.
B and the small frame portion 20C are provided, so that the main body 20 is unlikely to shift from the tire outer periphery, and even if a shift occurs, it naturally returns to the proper mounting state.

FIG. 9 shows a second embodiment of the invention. This embodiment differs from the first embodiment in that the reinforcing cords 16 and 18 for forming the small frame are omitted. Therefore, in the first embodiment, the four reinforcing cords 12, 14, 16.
Since it has a structure in which 8 intersect, the weaknesses of manufacturing 1, such as accuracy and processing man-hours, have been resolved.

Next, the experimental results of the first example and the second example will be explained together with the experimental results of the first comparative example and the second comparative example.

The tire slip prevention device of the first comparative example differs from the first example only in that the rubber layer corresponding to the rubber layer 19A of the first example is replaced with a rubber layer corresponding to the rubber layer 19B. Also, like the first comparative example, the second comparative example differs from the second embodiment only in that the rubber layer corresponding to the rubber layer 19A of the second embodiment is replaced with a rubber layer corresponding to the rubber layer 19B. are doing.

The experiment was conducted by driving 400 km on a dry road with a tire anti-slip device attached to the tire. Table 2 As is clear from the above Table 2, in the one-vehicle comparative example, twisting occurred at the ground contact portion with the road surface, whereas in both Examples, twisting did not occur.

In addition, in the one-car comparative example, the ground contact portion with the road surface was broken, whereas in both examples, where twisting did not occur, no breakage occurred, indicating that the strength was increased and the durability was improved.

In Table 2 above, "the occurrence of stickiness in the tire anti-slip device" refers to a phenomenon in which the rubber layer softens and deteriorates due to frictional heat due to slippage occurring between the tire and the tire anti-slip device, causing it to become fluffy. When this phenomenon occurs, the rubber layer becomes sticky to the tire, causing deterioration in the workability of removing the tire anti-slip device.

In the 7fS1 example and the second example, the short fibers 21 are embedded in the rubber layer 19A on the side that contacts the tire, and since the short fibers 21 in this example have a significantly high softening temperature, the short fibers 21 in the rubber layer 19A are The softening and deterioration is limited to a very small portion of the surface and does not progress inward, and the tire anti-slip device does not become sticky.

In addition, the reason why stickiness does not occur in the first comparative example even though short fibers are not buried is because the reinforcing cords 16 and 18 for forming the small frame are buried in the second comparative example. This is thought to be because the degree of twist is small and the frictional heat is low, and the presence of the reinforcing cords 16 and 18 prevents the softening and deterioration of the rubber layer from progressing inwardly.

In this way, in this embodiment, the short fibers 21 are embedded, thereby preventing twisting and improving durability.

In addition, the occurrence of stickiness is prevented, making it easier to remove the tire anti-slip device.

In particular, although the second example has improved durability than the first comparative example, the reinforcing cord for forming the small frame 16.18
By omitting this, the number of processing steps is reduced and productivity is improved. Furthermore, as the number of reinforcing cords has decreased, the reinforcing cords are washed away during vulcanization, their arrangement is disrupted, they are exposed on the surface, and are damaged and cut due to abrasion from the road surface and tires, or excessive tension is applied to some parts. The probability that the receiver will break is greatly reduced. That is, reinforcing cords are likely to be washed away during vulcanization at locations where many reinforcing cords intersect, and in the second embodiment, three or more reinforcing cords do not intersect, so the above probability is substantially reduced. is close to zero.

In the first and second embodiments, the short m fibers 2 were buried only in the rubber layer 19A, but as shown in FIG. If it is buried throughout, the durability will be further improved.

Furthermore, as shown in FIG. 11, the durability can be improved by embedding the short fibers 21 only in the middle part of the rubber layer. However, in this case, the anti-stickiness effect becomes low or disappears.

The short fibers 21 are preferably oriented in the direction perpendicular to the cross section of the rubber layer, as shown in FIG. 12, from the viewpoint of preventing twisting; however, in order to obtain the effect of preventing stickiness, The orientation direction does not matter.

As a method for manufacturing the rubber layer in which the short FIi fibers 21 are embedded, in addition to the rolling method as in the above embodiment, a sheet in which the short fibers 21 are oriented can also be obtained by extrusion. In addition to the method of punching with a cutter to obtain the desired body shape as in the above embodiment, a method of preforming unvulcanized rubber into a string shape by extrusion or rolling into the desired body shape is also applicable. It is. In addition, in order to orient the short fibers 21 in various different directions, the short fibers 21
It can be easily obtained by, for example, gluing oriented sheets together into multiple layers.

In the above embodiment, the main body shape is a tortoiseshell shape, but
It goes without saying that the present invention can be applied to various frame shapes.

[Effect of application] As explained above, in the tire slip prevention device according to the present invention, since short fibers are embedded in at least a part of the main body consisting of a collection of frames, twisting of the frames can be reduced. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the tire slip prevention device according to the present invention, FIG. 2 is a perspective view of FIG. 1, and FIG. 3 is a plan view showing the state of wire arrangement in the first embodiment. Figure 4 is the first
Figure 5 is a sectional view taken along the line V-V in Figure 1, Figure 6 is a front view of the spike, Figure 7 is a plan view of the spike, and Figure 8 is the manufacturing process of this example. A perspective view showing a part of
FIG. 9 is a plan view of the second embodiment of the present invention shown corresponding to FIG. 3, FIG. 1θ and FIG. FIG. 3 is a plan view showing the orientation direction of fibers. 10... Tire anti-slip device, 12.14... Reinforcement cord for outer frame formation, 16.18.
φ・Reinforcement cord for forming a small frame, 20...Main body, 20A...Outer frame part. 20B...First small frame portion, 20C...Second small frame portion, 21...Short fiber, 28...Spike.

Claims (2)

[Claims] (1) A tire slip prevention device comprising a main body made of an elastic material consisting of a set of frames, characterized in that short fibers are embedded in at least a portion of the main body. (2) The tire slip prevention device according to claim (1), wherein the short fibers are natural cellulose fibers.