JPS5945203A - Spike tyre - Google Patents

Abstract

PURPOSE:To prevent the breaker layer reliably from damage by arranging a fiber layer formed with topping cords of organic fiber in the entire spike burrying range between the breaker layer and spikes of a spike tyre. CONSTITUTION:A spike tyre 1 is provided with more than one layer of carcass layer 2 and double breaker layer 3, while a block lug 5 of predetermined shape is formed on the surface of a tread 4 and many spikes 6 are burried such that the peaks will project through the surface. In such a tyre, a fiber layer 7 is arranged between the spike 6 and the breaker layer 3. Said fiber layer 7 is made of topping cordo formed by stranding organic fibers such as polyamid fiber (including aromatic group) such as nylon 6.6 or polyester fiber into 840 denier strands which are implanted by 4-12 strands per 1cm then covered with rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a snow tire that reliably prevents damage to a breaker layer caused by spikes.

Snow tires, which are effective in preventing "sliding roughness" caused by frozen grass, etc., may become unusable due to damage to many of the snow tires on the tread surface.

The main cause of damage to the breaker layer is that repeated loads are applied to the spikes while driving on the road, which generates shear stress, which causes cracks in the tread rubber between the spikes and the breaker layer. The cracks gradually grew,
It is thought that water intruding through these cracks or coming in contact with air oxidizes the steel breaker, and the stress of the spikes damages the oxidized part of the breaker, which then causes the tread rubber and breaker layer to separate. .

In addition, even if the breaker is not oxidized, cracks may occur in the tread rubber, causing stress concentration in the breaker layer, or the flange of the spike may enter through the crack and come into contact with the breaker layer. Also by
It is thought that damage to the breaker layer will occur.

In any case, the damage to the breaker layer is not due to a single cause, but seems to be caused by a combination of many factors, but the occurrence of this damage is due to the fact that the tread rubber below the spikes does not crack, and that cracks do not occur. Even if the breaker layer is not exposed to water, air, or the flange part of the spike, do not let it touch the breaker layer.
This can be prevented by preventing stress concentration from occurring.

As a conventional technology that implemented this,
There is a device disclosed in Japanese Patent No. 09, in which a chipped wire layer consisting of short metal fibers mixed with rubber is formed on the top of the breaker layer, or a layer of rubber is formed between the chipped wire layer and the breaker layer. A chipped nylon layer made of nylon filaments arranged in the circumferential direction is interposed therebetween.

In this conventional technology, the chipped wire layer acts as a buffer material to reduce the occurrence of cracks in the tread rubber, and even if cracks occur in the tread rubber, it acts as a shielding material to completely prevent water and air from entering the breaker layer. Moreover, it is possible to prevent the flange portion of the spike from coming into contact with the spike, and the durability of the spiked tire can be completely improved compared to a tire without a chipped layer.

However, the thick wire layer has a preferred length of 8-1B.
+w full-layer short fibers, the chipped nylon layer has a suitable length of 5
Due to repeated elastic deformation of ~15M nylon filaments, initiation is likely to occur particularly at both ends of the short fibers, causing separation and damage to the mixed rubber and creating cavities within the layer. Sometimes, also,
Because they are short fibers, they have low tensile strength and poor durability against shearing forces. It is difficult to obtain satisfactory results.

In view of the problems of the prior art, the present invention prevents breakage and breakage within the fiber layer by arranging a fiber layer formed of a topping cord made of organic fiber between the breaker layer and the spike. high tensile strength and flexibility,
To provide a spiked tire which can sufficiently resist repeated shearing force from spikes and has sufficient durability.

The present invention is characterized by having a carcass layer and a breaker layer, and in which a large number of spikes with tips protruding from the tread surface are embedded at intervals in the circumferential direction and width direction. In spiked tires, 1
A fiber layer made of organic fibers is disposed between the fiber layer and the spikes over the entire area where the spikes are buried.

Embodiments of the present invention will be described below with reference to FIGS.

1 to 3, a spike tire (1) has one or more carcass layers (2) and, for example, two breaker layers (3), and the surface of the tread (4) is Block lugs (5) are formed, and a large number of spikes (6) are embedded so that their tips protrude from the surface of the tread (4), and fibers are placed between the spikes (6) and the breaker layer (3). A layer (7) is arranged.

The carcass M (2) is a cord layer made of steel or organic fiber, and the cord angle is set at approximately 90° with respect to the circumferential direction, and the breaker (3) is a cord layer made of steel, and the cord angle is set at approximately 90° with respect to the circumferential direction. are oriented, for example, at an angle of 15 to 60 degrees with respect to the circumferential direction, and in the case of two layers, they are arranged in an X-shape. From the surface of this breaker layer (3) to the tread (4)
The thickness to the surface of A is the length of the spike (6) 13)
The fiber layer (7) is set to 105 to 150% of
For example, polyamide-based (including aromatic) fibers such as nylon 6-6 or organic fibers such as polyente/L/thread fibers are made into lozenges with a fineness of 840 denier) v/'2, and this pure system is made into a lozenge with a fineness of 840 denier) v/'2 per 1σ. It is a topping cord made of 4 to 12 pieces and covered with rubber, and may be laminated in 2 to 3 layers in addition to one cord, and the cord angle is in the range of 0 to 90 degrees with respect to the circumferential direction. Where applicable, G' is best. Cord angle θ°
In this case, the fiber layer (7) has one connection part around the entire circumference of the tire (1), and the yarn length is approximately equal to the total circumference length of the tire.

This fiber layer (7) is baked on the surface of the breaker layer (3), but is not limited to this; for example, as shown in FIG. It may be placed midway between the layer (3) and the spikes (6) so that tread rubber is interposed on the inside and outside of the layer (3) and the spike (6).
Although not shown in the figure, it is possible to arrange the fiber l# at a position where the surface of the layer (7) is in contact with the 7 rung part (6a) of the 7 bike (6).

Next, a test example is shown.

Tire outer diameter (C) 656 tire inner diameter (1)) 655y lug groove depth hole -) 11" Tread rubber (Fn 23+U waspike length B) 12mm spike embedded length B)
'11 F from the tread surface to the carcass chest
J block A) 18+i+x force - waste layer (2) 1 layer (slur /I/) breaker layer (3) 2~ (steel) fiber layer (7) 1 layer (nylon 6/6) fiber
840 Tenino V/2 Fiber A-Large, number of threads 10 wood/σ This spike tire has a mileage of 1500 Y, and is not immersed in 10% salt water for one day every time, 35000 K.

When running, there were some places where cracks were fully formed under the brake, but there were very few cracks that reached the fiber M(l), and there was no damage to the breaker layer and no destruction of the 75-i Xlf: layer. No spikes fell off. Also,
For fiber M(7), no difference was observed between the 1-layer and 2-layer cases (t ratio), but when the cord angle was 75; 1 It was recognized that the elongation rate was very low and that it was extremely durable. In addition, spike (6)
The arrangement was as shown in FIG.

As is clear from this test result, when the fibrous layer (7) is placed between the breaker layer (3) and the spikes (6), the fibrous layer (7) has high tensile strength and bonding strength and is flexible. The shape retention and cushioning properties of the lower part of the spikes (6) are the same as above, the resistance to the shearing force from the spikes (6) is extremely high, and the high durability of the fiber layer (7) makes it possible to improve the tread rubber. It prevents the occurrence of cracks and suppresses the growth of cracks even if they occur, thereby forming a breaker layer (3
), it is recognized that the company is trying to avoid causing any damage to the product.

In the spike tire (1) constructed as described above, in order to enhance the anti-slip effect, the buried position of the spikes (6) must be set at the best position, and burying the spikes (6) at the best position is the same as described above. This is also a factor in fully demonstrating the effect of preventing damage to the breaker layer.

The second meat shows the best position of the spike (6), and the entire width (J) of the tread (4) is shown by 3 μm.
(P), each group μm (K) (NJ (Pi is 3
Two sets are arranged in each row, and the two sets in the group direction are distributed on both sides of the tread center (OL).

The upper and lower groups (T) (or two groups each have spikes (6) placed on each other at every other pitch, and the snow (6) in each group.
Iku (6) is out of sequence. That is, the spikes (6) in one set are arranged one row at a time by two pitches:)1
゜Same group■ (spikes (6) in Pi are shifted by 1 bit.

The two pairs of spikes (to the middle group) are arranged with spikes (6)'@: every two pitches and shifted one row at a time, and the spikes (6)'@: are placed every two pitches and shifted by one row.
6) are located within the same pitch.

For example, if the tire outer diameter is 656 nm, the groove μm (A) (NJ (, lff1 interval σ)) is 26.5 fl, and the upper and lower grooves -7° (6) (No group interval (Kt) (Pt) is rullIr4, the interval (Nt) of the set of medium hoop boxes is 18
Friend, the spacing between all rows is 2 mushrooms, and I'm going to cum (6)
is located within 10 to 80% of the half width from the tread center (OL).

In addition, the pitch variation of the spiked tire (1) shown in Figure 2 is divided into seven equal parts, and 8 = 44.8-
, M='49.0, L≠56.4
3 species σ) Bi-Sochi is self-equipped with M/2・8.8 layer M・L @L @M/2 to form a positive self-array, and this positive array is converted to 180a homogeneous and reversed. form an array,
This forward and reverse array is the j[ll
It is arranged and configured.

According to the present invention described in detail above, since the fiber layer formed of the topping cord made of organic fiber is disposed between the breaker layer and the spike over the entire area where the spike is buried, the W & fiber layer is Compared to a chipped layer mixed with short metal fibers and/or nylon filament gold rubber, it has higher tensile strength, bonding strength, and flexibility, and does not cause self-internal destruction even when subjected to repeated delta force, and can withstand shear from spikes. It has a high buffering effect against force and extremely high resistance,
Since the tread rubber retains its shape with respect to the surrounding tread rubber, there is very little chance of cracks in the tread rubber caused by spikes even when driving over long distances. Cracks that reach the layers are not generated, thereby increasing the durability of the spiked tire and completely preventing the CD from sinking or falling off.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention.
2 is a plan view, FIG. 6 is an enlarged sectional view of a main part, and FIG. 4 is a sectional view showing the other side of the fiber layer arrangement. (1)...Spike tire, (2)...Carcass layer, (3)...Breaker layer, (4)...Tread, (
6)...7 bikes, (7)...woven-fiber layer. Patent application (Applicant Otsu Tire Co., Ltd. Procedural amendments imported) Director General of the Japan Patent Office 1 Indication of the case 1982 Patent Application No. 154200 2 Name of the invention Spike Tire 3 Relationship with the amendment person case Patent application Person Otsu Tire Co., Ltd. 4 Agent 5 Date of notice of reasons for refusal 13-

Claims (1)

[Claims] 1 In a spiked tire having a carcass layer and a breaker layer, and in which a large number of spikes with tips protruding from the tread surface are buried at intervals in the circumferential direction and width direction,
A spike tire characterized in that the breaker layer and the slatted fiber layer are arranged.