JPS63199105A - Spike tire - Google Patents

Abstract

PURPOSE:To improve shock absorbing quality and climbing performance and to prevent a lawn from being damaged, by providing plural spikes to be implanted in a tread part, which eliminates the ruggedness, and filling a tire with air of predetermined low pressure, in the case of the captioned tire which runs on the lawn. CONSTITUTION:A tire main unit 2 arranges a cord of a carcass 7 at an angle about 90 deg. with respect to the center surface in the tire circumferential direction, and a tread part 3 of the tire main unit 2 substantially eliminates a rugged part. And the tread part 3 provides plural spikes 5 to be implanted. This spike 5 is divided into a nail part 8, forming its one end to a cone shape, and an implanted part by a flange part 10, and the spike 5 sets its protruding height L1 above or below about 10mm by embedding the implanted part 9 in the tire main unit 2. And air, with which a tire is filled, is set to a pressure of 0.1-1.0kg/cm<2>. By this constitution, the tire improves its shock absorbing quality and climbing performance further enables damage of a lawn to be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitably used for vehicle tires that run on lawns, more specifically, golf carts, lawn mowers, etc.
This invention relates to a spike tire that has excellent shock absorption and pitching ability and can reduce damage to grass.

[Background technology]

Conventionally, low-pressure tires with a filling air pressure of 0.4 to 0.8 kg/aJ have been used for vehicles that run on lawns, such as golf carts, and by lowering the tire contact pressure, damage to the lawn can be reduced. was reduced.

In addition, such tires are provided with a tread pattern to obtain kick-off force, but this tread pattern reduces the tire contact area and makes it possible to maintain uniform and low contact pressure on the grass. However, it was not possible to sufficiently prevent damage caused by trampling on the lawn. Furthermore, the tread pattern caused leaves to be cut into the lawn when running straight or turning, and the damage prevention effect thereof was not fully satisfactory.

[Promise of invention]

In view of this background, the present invention is based on installing spikes in the tread of a low-pressure slick tire, which provides i4'' iH absorption and pitching ability, while greatly reducing damage to grass. The object of the present invention is to provide a spiked tire that can solve the above problems.

[Means for solving problems]

An embodiment of the present invention will be described below based on the drawings.

In the figure, the spiked tire 1 of the present invention has a plurality of spikes 5 embedded in a tread portion 3 of a tire body 2 substantially free of unevenness, and preferably has a weight of 0.1 to 1°0 kg/-. 0.1~0.5kg/a! It is characterized by being filled with low pressure air.

As described above, the tire body 2 is a low-pressure tire, and its tread portion 3 is formed in a so-called slick shape with substantially no unevenness, and in this example, a pair of left and right bead cores 6, It includes a carcass 7 whose end portion is folded back around the bead core 6 and is locked therein.

The ear body 2 is usually made of natural rubber, synthetic rubber, etc., but various elastomers can also be used, and the carcass 7 is made of nylon, aromatic polyamide, polyester, etc.
It is composed of cords made of organic fibers such as rayon.

In this example, the tire body 2 has a radial structure in which the cord of the carcass 7 is arranged at an angle of 90° or close to 90° with respect to the center plane in the circumferential direction of the tire, and sleeve reinforcements are provided in the tread portion 3. It is formed in a so-called beltless shape that does not have a belt layer such as a belt layer. Further, spikes 5- are planted in the tread portion 3 and arranged along the circumferential direction of the tire.

The spike 5 has a cone-shaped needle part 8 at one end and an embedded part 9 at the other end, which are separated by a collar part 10, and the embedded part 9 is embedded in the tire body 2.

In addition, it is preferable that the protruding height Ll of the needle part 8 is set to around Lof1 from the viewpoint of the tire's pitching ability, and the flange part 1
0 has a diameter of 15 to 3 from the viewpoint of ground pressure.
It is preferable to set it after Q m H7ii.

In addition, the flange may be formed into a non-circular shape such as a square or a hexagon in addition to a circle or an ellipse.
is provided and the spike attachment forms a grip for the device. The embedded portion 9 may also be formed into a circular shape, an oval shape, or a polygonal shape to prevent rotation. Further, the height of the embedding can be determined depending on the tread thickness (T: arbitrarily set L7). Spikes normally arranged on golf carts can also be suitably used.

Also, golf carts generally have a tread width L2 of 160+L.
&1iTilf& tires are used, but spikes 5
5. When considering the tread width L2, it is desirable to arrange them in 3 to 6 rows, preferably 4 to 5 rows, and the P setting P is 30 when considering the tire longitudinal rigidity and tire strength.
It is desirable to set the number to 180 pieces, preferably 50 to 120 pieces.

The spikes 5 can be made of plastic materials, metal materials, etc., as well as cemented carbide, ceramic, silicate aluminum composite materials, and reinforced plastics containing glass fibers, carbon fibers, aramid fibers, whiskers, etc. Attrition fl
It is desirable to use 4. Also, spike 5 is
After vulcanizing and forming the tire body 2 in which mounting holes are to be provided in advance,
A spike 5 is installed in the mounting hole. In such a case, the spikes can be easily replaced depending on wear. In addition, the spike 5 may form a locking portion 9A in which the lower end of the embedded portion 9 bulges out, as shown in FIG.

In this way, the spike tire 1 of the present invention has a tire main body 2
Because it is constructed with low-pressure tires with an air pressure of 0.1 to 1.0 kg/cd and uses a beltless radial structure,
The tire's longitudinal spring constant can be lowered, improving shock absorption. Moreover, since the tread portion 3 is formed into a slick shape without unevenness, a wider ground contact surface can be formed, and a ground contact pressure that is equalized and reduced and a smooth ground contact surface can be obtained.

Therefore, the spiked tire 1 can reduce damage to the lawn due to treading force, and can also prevent lawn leaves from being cut during transfer. Furthermore, since the spikes planted in the tread portion 3 are supported by the roots of the grass, a strong kicking force can be obtained without damaging the grass surface, making it possible to run on steep slopes.

Furthermore, since the spike tire 1 has a radial structure with low cornering power and low lateral rigidity, the side part of the tire can absorb the lateral slippage on the tire contact patch caused by centrifugal force during turning, and the spikes 5 and - By preventing lateral sliding and dragging, the effect of preventing damage to the lawn can be further enhanced.

In this example, a low-pressure tire with a radial structure without a belt layer was described as the tire body 2, but it is also possible to adopt a radial structure with a belt layer (in such a case, organic fibers are used as the belt layer). It is preferable to lower the longitudinal spring constant of the tire by using a cord etc. Also, the carcass 9
It is also good to adopt a cross-ply structure in which the grooves are arranged at a relatively shallow angle, for example, at an angle of 25 to 45 degrees, with respect to the center plane in the circumferential direction of the tire.

It is also possible to add a reinforcing layer and a bead epex, but it is better to configure the tire as a so-called cordless tire that does not include all of these reinforcing materials.

〔Effect of the invention〕

As mentioned above, the spiked tire of the present invention is formed as a low-pressure tire with a tod L with no unevenness and a plurality of spikes planted in the tod part, so it has excellent shock absorption and pitching ability. It is possible to obtain equalized and reduced ground contact pressure and a smooth running surface, thereby reducing damage to the lawn due to cutting, pressing, etc. of the lawn. Furthermore, when a radial structure without a belt layer is adopted as the tire body, it is possible to prevent the spikes from shifting laterally and dragging during turning, and the effect of preventing damage to the grass can be further enhanced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view showing another embodiment of the spike. 2.--Tire body, 3.--Tread section, 5.-
·spike. Patent Applicant Sumitomo Rubber Industries Co., Ltd. Agent Patent Attorney Tadashi Naemura Figure 2, Figure 3m

Claims (4)

[Claims] (1) A plurality of spikes are planted in the tread portion of the tire body, which has virtually no unevenness, and the air pressure is 0.1 to 1.
A spike tire characterized by being filled with low pressure air of 0 kg/cm^2. (2) The spike tire according to claim 1, wherein the tire body has a cross-ply structure, a radial structure, or a radial structure without a belt layer. (3) The spike tire according to claim 1, wherein the spikes are arranged in 3 to 6 rows along the tire circumferential direction on the tread portion. (4) The spikes have a diameter of 30 to 180 on the tread portion.
The spike tire according to claim 1, characterized in that the spike tire is planted in a range of 1.