JP3001855U - Spike tire - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a spiked tire that solves the problem of asphalt dust by allowing spikes to project and retreat by changing tire pressure. [Structure] The spike tire 20 is a tubeless spike tire in which spikes 2 are planted along the vicinity 1 of the center of the tread portion of the tire ground contact surface, and synthetic rubber 4a is provided on both sides of a non-stretchy and robust cloth 3. The airtight film 5b having the bake 4b is formed on the tire inner surface so that the tread central portion 6 immediately below the spikes and the bead base portions 8a and 8b contacting the wheels 7 on both sides of the tire have a V-shaped cross section. By sticking along the inner circumference, the space inside the tire is divided into a central region X and three regions, left and right side regions Y and Z, and a metal pipe 9a for introducing air into the left and right side regions Y and Z. , 9b and rubber pipes 10a, 10b are connected to the side regions through holes 15a, 15b formed in the wheel 7 while maintaining airtightness, and a valve 16 is attached. It

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a spiked tire that has a high braking effect when the road is snowed or frozen in winter, and more specifically, by changing the tire air pressure, only the center of the tread where the spike is planted is the ground contact surface. It is related to spiked tires that can be driven on both ice and snow roads and on general roads by making them protrude and leave.

[0002]

[Prior art]

 When snow or freezing occurs on mountain roads and general roads in winter, the grip between the tire tread of a car and the road surface is significantly reduced, making it slippery and extremely dangerous during driving.

Conventionally, as a method for preventing the above-mentioned tires of automobiles from slipping, a so-called spike tire in which a tire chain made of a metal (mainly iron) chain is attached to the tire or a large number of metal studs (spikes) are driven into a tread portion The method of wearing was common.

However, the work of mounting the above-mentioned tire chain in a cold outdoor environment is very troublesome because it requires jacking up, and even an unfamiliar person cannot properly mount the tire chain and sometimes detaches it during driving. . Moreover, because it is made of metal (iron), noise during operation is large, tires are worn, and riding comfort is far from comfortable. Moreover, especially on roads where snow roads and regular roads are intermittent, the disposition is bad.

Further, although the braking effect of the metal chain itself is strong, it has poor durability and is heavy, and therefore many people feel inconvenience when using it.

[0006] In this respect, the spiked tire can run on both ice and snow roads and general roads, and does not generate as much noise as a tire chain when running on a paved road surface, and the riding comfort is not so bad.

However, since it is difficult to replace a conventional spike tire with a normal tire as needed at any time, many people continue to ride the spike tire once it is installed during the winter season. At this time, if you always drive only on mountain roads in winter on ice and snow roads, you don't know, and in general, you often drive on dry roads with no snow, so spikes are generated by scraping the road surface. Asphalt dust is considered to be harmful to humans.

Recently, studless tires are regarded as a promising alternative to spiked tires. This studless tire is made of synthetic rubber that is softer than a normal tire, and generally has a structure in which a large number of slit-shaped grooves are additionally arranged in a special tread pattern.

[0009]

[Problems to be solved by the device]

 However, the studless tires that replace the spiked tires have twice the anti-skid ability (braking ability) as compared to the normal tires, but at present the performance that is necessary and safe for driving is not yet obtained. Therefore, even in a vehicle equipped with a studless tire, if the vehicle is slippery due to snow or freezing on the road, it will be necessary to install a tire chain.

On the other hand, spiked tires have a high braking ability and exhibit excellent performance. However, as mentioned above, there is a problem of asphalt dust due to some spikes, and the "Spike tire dust prevention method" was enacted in 1990. The current situation is that regulations on spiked tires in each prefecture are increasing.

The present invention has been made in view of the above circumstances, and only the central portion of the tire tread surface where the spikes are planted is projected or retreated with a simple operation without replacing the spike tire with a normal tire. By providing such a structure, it is possible to provide a spiked tire that solves the above-mentioned problem of asphalt dust while utilizing the advantages of the spiked tire.

[0012]

[Means for Solving the Problems]

 The present invention is a tubeless spike tire in which spikes are planted along the vicinity of the center of the tread portion of the tire contact surface, and an airtight film made by baking synthetic rubber on both sides of a non-stretch robust fabric is applied to the inner surface of the tire. By sticking along the inner circumference of the tire so that the cross-sectional shape becomes a V-shape, the middle part of the tread that is directly under the spike and the bead base part that contacts the wheels on both sides of the tire, the inner space of the tire is centered. Divide into three areas, the central area and the left and right side areas, and provide airtightness to the side areas from the hole formed in the wheel with a pipe in which a metal pipe and a rubber pipe that connects air into the left and right side areas are connected. The above object is achieved by providing a spike tyre, which is fitted and inserted while being held and a valve is attached.

[0013]

[Action]

 In the spike tire according to the present invention, the space inside a general tubeless tire is divided into three parts by an airtight film in which synthetic rubber is baked on both sides of a non-stretch robust cloth. That is, the airtight film is attached along the inner circumference of the tire to the central portion of the tread on the inner surface of the tire and the bead base portions contacting the wheels on both sides of the tire so that the cross-sectional shape becomes a V shape. ing.

Therefore, the space divided into three parts is the central region and the left and right regions, and when the air pressures in each region are equal, the airtight membrane is in a state of being stretched straight, but the air pressure in the central region is higher than that in the side regions. When becomes higher, the airtight membrane bulges toward the side area and bends. Then, the airtight film, due to its non-stretchability, acts to pull the center portion of the tread on the inner surface of the tire, which is attached, toward the center of the tire to make the center of the tire tread depressed.

Therefore, if the spikes are planted only along the vicinity of the center of the tread portion of the tire ground contact surface, the spikes protruding from the ground contact surface will retreat and separate from the ground surface due to the above action.

That is, by changing the tire air pressure, the spikes planted along the vicinity of the center of the tread portion can be made to protrude or retreat to the ground contact surface, and the problem of asphalt dust can be solved.

Next, since the tire inner space is divided into three parts as described above, first, the air pressure is adjusted in the central region by utilizing the rim valve which is conventionally arranged on the rim. In addition, the air pressure in the left and right side areas is inserted into the left and right side areas while maintaining airtightness by inserting a pipe in which a rubber pipe is connected to the tip of a metal pipe into the left and right side areas through a hole formed in the wheel. Adjust through the valve.

As described above, in this spike tire, the central portion of the tread where the spikes are planted is pulled toward the center by the bending of the non-stretchable airtight membrane attached to the inner space of the tire due to the change in air pressure. By doing so, the protrusion and retreat of the spike to the ground contact surface can be controlled.

[0019]

【Example】

 An embodiment of the spike tire of the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view showing a state in which a spike of a spike tire according to the present invention protrudes from a contact surface, and FIG. 2 is a sectional view showing a state of the spike in the spike tire retracting from the contact surface. FIG. 3 is a vertical cross-sectional view of the entire spike tire, where (A) shows a ground contact state when traveling on an icy snow surface and (B) when traveling on a dry road surface.

In FIG. 1, a spike tire 20 is a tubeless spike tire in which spikes 2 are planted along the vicinity 1 of the center of the tread portion of the tire ground contact surface, and both sides of a non-expandable and sturdy cloth 3 are provided. The airtight film 5 with synthetic rubbers 4a and 4b baked on the tread central part 6 directly below the spikes on the inner surface of the tire, and the bead base parts 8a and 8b that come into contact with the wheels 7 on both sides of the tire. By sticking along the inner circumference of the tire so as to form a letter shape, the inner space of the tire is divided into a central area X and left and right side areas Y and Z, and to the left and right side areas Y and Z. A valve in which metal pipes 9a, 9b for injecting air and rubber pipes 10a, 10b are connected is fitted into the side area through holes 15a, 15b formed in the wheel 7 while maintaining airtightness, and the valve 1 6 is attached.

Explaining each of the above members in detail, first, tubeless tires are currently the mainstream type of passenger car tires, and like the bias tires, a rubber layer and a cord of a chemical fiber layer called a carcass 12 (mainly a radial cord). (Structure) and a steel belt 22 to be described later are laminated to form a multiple structure. Instead of a tube, there is a thin rubber layer called the inner liner 11 on the inner surface of the tire, and a bundle of steel wires is wrapped in ply. The bead portion 13 is made of a material called a bead base (8a, 8b) that does not leak air and has a bead diameter with a tightening margin. Further, the tire surface is made of a thick rubber layer 21, but a layer called a steel belt 22 is incorporated between the tire surface and the carcass 12 so as not to damage the carcass 12 by a road surface protrusion. A valve 18 for letting in air is fixed directly to the wheel 7.

Next, the airtight film 5 is a film in which synthetic rubbers 4a and 4b are baked on both sides of a non-stretchable and strong cloth 3 (for example, glass fiber, aramid fiber, carbon fiber, alumina fiber, etc.). It has a material that does not expand or contract while maintaining airtightness even under a high pressure of ² kg to 10 kg / cm ² in the tire.

The airtight film 5 has a vertically elongated C-shaped cross section in the tread central portion 6 which is directly below the spike 2 on the tire inner surface and the bead base portions 8a and 8b which come into contact with the wheels 7 on both sides of the tire. It is attached along the inner circumference of the tire. The central portion 6 is firmly attached by thermocompression bonding or welding, and the bead base portions 8a and 8b are pressed and fixed to the wheel together with the inner liner. The airtight film 5 attached to the tire inner space completely divides the tire inner space into a central region X and left and right side regions Y and Z.

Therefore, since the conventional valve 18 fixed to the wheel serves as an air inlet for only the central region X, it is necessary to provide an inlet for air in the left and right side regions Y, Z. The pipe 17 that connects the metal pipes 9a and 9b and the rubber pipes 10a and 10b plays this role, and maintains airtightness in the side regions Y and Z from the holes 15a and 15b formed in the wheel 7. The valve 16 is attached to the pipe end while being fitted (using packing) from the wheel side.

The rubber pipes 10 a, 10 b inserted in the side regions Y, Z have flexibility and are bent in response to the expansion curve of the airtight film 5 described later to damage the airtight film 5. It is desirable that it does not interfere with the bending deformation.

Further, the metal pipes 9a, 9b are integrally connected to the pipe 17, and it is desirable to take a measure to lock the brim to the bead portion so as not to flutter in a tire rotating at high speed.

Incidentally, in the usual spike tire, spikes are planted on the entire surface of the tread portion. However, in the spike tire of the present invention, only the central portion of the tread is provided, and both tread sides are not planted.

In the spike tire having the above-described structure, when traveling as a spike tire on an icy and snowy road surface, the air-tightness film 5 prevents the air pressure in the central region X and the side regions Y and Z of the tire internal space from being changed as shown in FIG. The valves 16 and 18 are adjusted so as to be in a state of being stretched straight (ie, X, Y, and Z have the same atmospheric pressure).

Next, when traveling on a general road, the central region X is set to a higher atmospheric pressure state by the valve 18 (in addition, the air pressure in the side regions Y and Z may be lowered), and the central region X is set. Increase the volume of. Then, in the central region X, the cross section tends to be circular under the P condition of a constant surface area (the airtight film 5 does not expand and contract), so that the left and right of the airtight film 5 are pressed in the direction of the arrow, and the airtight film 5 Is bent and deformed. On the contrary, because of its non-stretchability, the airtight film 5 pulls the tread central portion 6 on the inner surface of the attached tire toward the center of the tire to make the tread central portion on the tire surface depressed.

Therefore, the spikes planted in the center of the tread portion on the tire surface are pulled into the inside of the tire and are separated from the ground contact surface 24. (Refer to FIG. 3) In the spike tire according to the present invention described above, the main object of the present invention is to attach a non-stretchable airtight film to the inner space of the tire and divide the tire into three parts to change the air pressure. The point is that the airtight membrane is curved and deformed so that the center part of the tread where the spikes are implanted is recessed.If it is based on the above idea, the material of the airtight membrane, the attachment method, etc. Difference does not matter.

Further, in consideration of the high pressure in the central region X, a tube sealed to the valve 18 is attached, and a method for raising the central region X to a high pressure is performed as if it were a tire with a tube. Would be good. In this case, it is considered that the airtightness of the airtight film 5 is not so high but fulfills its function.

[0033]

[Effect of device]

 Since the spike tire according to the present invention is configured as described above, it has the following effects.

(1) It has an excellent effect that it can be used as a spiked tire only on ice and snow roads, and as a spike-free tire on general roads.

(2) It has an excellent effect that it can be switched between the spike tire and the normal tire simply by changing the air pressure and is extremely simple.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which spikes of a spike tire according to the present invention protrude from a ground contact surface.

FIG. 2 is a cross-sectional view showing a state in which a spike in the spike tire has retreated from a ground contact surface.

FIG. 3 is a vertical sectional view of the entire spike tire,
(A) shows the ground contact state when traveling on an icy and snowy road surface, and (B) shows the ground contact state when traveling on a dry road surface.

[Explanation of symbols] 1 near the center of the tread portion 2 spikes 3 fabrics 4a, 4b synthetic rubber 5 airtight film 6 central portion of the tread inside the tire 7 wheels 8a, 8b bead base portion 9a, 9b metal pipes 10a, 10b rubber pipes 11 Inner liner 12 Carcass 13 Bead portion 15a, 15b Holes 16, 18 Valve 17 Tube 20 Spike tire 21 Rubber layer 22 Steel belt 24 Ground plane X Central area Y, Z side area

Claims (1)

[Scope of utility model registration request] 1. In a tubeless spike tire in which spikes are planted along the vicinity of the center of the tread portion of the tire ground contact surface, an airtight film made of synthetic rubber baked on both sides of a non-stretch robust fabric is provided on the inner surface of the tire. By sticking along the inner circumference of the tire so that the cross-sectional shape becomes a V shape, the center part of the tread that is directly under the spike and the bead base part that contacts the wheels on both sides of the tire Area and left and right side areas are divided into three areas, and a metal pipe and a rubber pipe that connects air into the left and right side areas is connected to the side area from a hole formed in the wheel through a pipe connected to the rubber pipe. A spike tire that is fitted and valved while being inserted.