JP6272393B2 - tire - Google Patents

Description

  The present invention relates to a tire.

  Conventionally, in spike tires (studded tires), when the ICE road surface (ice and snow road surface) travels, spike pins (studs) embedded in stud holes formed in the spike tires are inserted into the ICE road surface. The braking performance and the driving performance (ICE performance) on the ICE road surface are improved.

Patent 4488099 JP 2009-255605 A JP 2008-230259 A JP 59-96005 A

  However, in the conventional spike tire, when the ICE road surface travels, the spike pin penetrates into the ICE road surface, whereby ice is excavated and ice powder is generated.

  As a result, the ice powder adheres to the periphery of the spike pin, the penetration of the spike pin into the ICE road surface is hindered, and there is a problem that the ICE performance and the robustness are deteriorated.

  Therefore, the present invention has been made in view of the above-described problems, and provides a tire capable of suppressing the adhesion of ice powder to the periphery of the spike pin and avoiding a decrease in ICE performance and robustness. Objective.

  A first feature of the present invention is a tire having a tread portion, wherein a stud hole for embedding a spike pin is formed on a tread surface of the tread portion, and the stud hole is formed on the tread surface of the tread portion. The gist is that a recess is formed around the.

  In the first aspect of the present invention, the recess may be configured such that the depth from the tread portion of the tread portion increases as the distance from the stud hole in the tire circumferential direction increases. .

  In the first feature of the present invention, the recess may be configured such that the depth from the tread portion of the tread portion increases as the distance from the stud hole in the tire width direction increases. .

  In the first feature of the present invention, the tread portion is provided with a block defined by a circumferential groove extending in the tire circumferential direction and a width direction groove extending in the tire width direction, and the tire stepping of the block from the recess is provided. A stepping side groove connected to the width direction groove on the side may be formed, and the stepping side groove may be configured to be inclined by a predetermined angle with respect to the tire circumferential direction.

  In the first feature of the present invention, the tread portion is provided with a block defined by a circumferential groove extending in the tire circumferential direction and a width direction groove extending in the tire width direction, and the tire kick of the block from the recess is provided. A kick-out groove that is connected to the width-direction groove on the exit side may be formed, and the kick-out groove may be configured to be inclined by a predetermined angle with respect to the tire circumferential direction.

  In the first feature of the present invention, the kick-out side groove is configured such that the depth from the tread portion of the tread portion increases as the distance from the stud hole in the tire width direction increases. Also good.

  1st characteristic of this invention WHEREIN: The said recessed part may be formed in the range of 8 mm or more and 12 mm or less from the center position of the said stud hole.

  1st characteristic of this invention WHEREIN: The depth from the tread surface of the said tread part may be comprised so that it may be set to 0 mm or more and 2.0 mm or less in the said recessed part.

  1st characteristic of this invention WHEREIN: The said predetermined angle may be comprised so that it may be 0 degree or more and 70 degrees or less.

  A second feature of the present invention is a tire having a tread portion, wherein a circular groove is formed on a tread surface of the tread portion, and a stud hole for embedding a spike pin is formed on the bottom surface of the groove. It is formed, and the gist is that a recess is formed around the stud hole on the bottom surface of the groove.

  As described above, according to the present invention, it is possible to provide a tire capable of suppressing the adhesion of ice powder to the periphery of the spike pin and avoiding a decrease in ICE performance and robustness.

1 is a plan view of a part of a tread surface in a tire according to a first embodiment of the present invention. It is an enlarged view of the stud hole periphery in the tread surface in the tire concerning a 1st embodiment of the present invention. It is AA sectional drawing in the enlarged view of the stud hole periphery in the tread tread surface in the tire which concerns on the 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line B-B in an enlarged view around a stud hole in a tread surface in the tire according to the first embodiment of the present invention. It is an enlarged view of the stud hole periphery in the tread surface in the tire concerning the example 1 of change of the present invention. It is CC sectional drawing in the enlarged view of the stud hole periphery in the tread surface in the tire which concerns on the modification 1 of this invention. It is an enlarged view of the stud hole periphery in the tread surface in the tire which concerns on the modification 2 of this invention. It is DD sectional drawing in the enlarged view of the stud hole periphery in the tread surface in the tire which concerns on the modification 2 of this invention. It is AA sectional drawing in the enlarged view of the stud hole periphery in the tread tread surface in the tire which concerns on the modification 3 of this invention. It is BB sectional drawing in the enlarged view of the stud hole periphery in the tread surface in the tire which concerns on the modification 3 of this invention.

(First embodiment of the present invention)
A tire according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

  As shown in FIG. 1, a plurality of circumferential grooves 2 extending in the tire circumferential direction L and a plurality of widthwise grooves (lug grooves) 3 extending in the tire width direction W are formed in the tread portion of the tire according to the present embodiment. ing.

  Here, the tire circumferential direction L is a circumferential direction centered on the tire rotation axis, and the tire width direction W is a direction parallel to the tire rotation axis.

  In addition, a plurality of blocks (land portions) 4 partitioned by a plurality of circumferential grooves 2 and a plurality of width grooves 3 are formed in the tread portion of the tire according to the present embodiment.

  As shown in FIG. 1, the shape of each block 4 viewed from a direction perpendicular to the tread surface (surface contacting the road surface) 100 may be a rectangular shape, a parallelogram shape, or an arrow blade. Other shapes, such as a shape, may be sufficient.

  Further, as shown in FIGS. 1 to 4, a stud hole 10 for embedding a spike pin is formed in the tread surface 100, specifically, the tread surface 100 in the block 4. .

  The stud hole 10 may be formed in a part of the plurality of blocks 4 or may be formed in all of the plurality of blocks 4.

  Further, as shown in FIG. 2, a recess 20 is formed around the stud hole 10 in the tread surface 100, specifically, in the tread surface 100 in the block 4. That is, the stud hole 10 is configured to open at the tread surface 100.

  For example, the concave portion 20 may be formed so as to surround the entire stud hole 10 in an annular shape, or may be formed so as to surround a part of the stud hole 10 in an annular shape.

  According to such a configuration, the ice powder generated by the spike pin can be discharged without adhering to the tread surface 100.

  Here, as shown in FIG. 3, in the above-described recess 20, the depth h <b> 1 from the tread surface 100 of the tread portion increases as the distance from the stud hole 10 in the tire width direction W increases. May be.

  According to such a configuration, the block rigidity around the stud hole 10 can be ensured.

  As shown in FIG. 4, the recess 20 is configured such that the depth h2 of the tread portion from the tread surface 100 increases as the distance from the stud hole 10 in the tire circumferential direction L increases. It may be.

  According to such a configuration, the block rigidity around the stud hole 10 can be ensured.

  For example, the recess 20 described above may be formed within a range of a distance of 8 mm to 12 mm from the center position of the stud hole 10.

  Moreover, in the above-mentioned recessed part 20, the depths h1 and h2 from the tread part 100 may be comprised so that it may be set to 0 mm or more and 2.0 mm or less.

  Here, in the recessed part 20 arrange | positioned at the tire circumferential direction L outer side of the stud hole 10, the depth h1 from the tread part 100 of the tread surface may be comprised so that it may be set to 0 mm or more and 2.0 mm or less.

  Or in the recessed part 20 arrange | positioned on the tire width direction W outer side of the stud hole 10, you may be comprised so that the depth h2 from the tread surface 100 of a tread part may be 0 mm or more and 2.0 mm or less.

  According to the tire according to the present embodiment, since the ice powder generated when traveling on the ICE road surface can be discharged by the recess 20 formed around the stud hole 10, the adhesion of the ice powder around the spike pin, and It is possible to prevent the spike pin from penetrating the ICE road surface, and to avoid the deterioration of the ICE performance and the robustness.

(Modification 1)
Hereinafter, with reference to FIG. 5 and FIG. 6, the tire according to the first modification of the present invention will be described focusing on differences from the tire according to the first embodiment described above.

  As shown in FIG. 5, in the tire according to the first modification, a depression side groove 30 </ b> A that connects from the recess 20 provided in the block 4 to the width direction groove 3 on the tire depression side A <b> 2 of the block 4 is formed.

  Here, as shown in FIG. 5, a plurality of such stepping side grooves 30 </ b> A may be provided, or only one may be provided.

  Further, the depression side groove 30A may be configured to be inclined with respect to the tire circumferential direction L by a predetermined angle θ1. Here, the predetermined angle may be configured to be 0 ° to 70 °.

  As shown in FIG. 6, the depression side groove 30A is configured such that the depth from the tread surface 100 of the tread portion increases as the distance from the stud hole 10 in the tire width direction W increases. (H3 <h4).

  According to such a configuration, it is possible to avoid a decrease in the amount of ice powder to be discharged while securing the block rigidity around the stud hole 10.

  Here, the length W1 in the tire width direction W of the depression side groove 30A may be configured to be 1.0 mm or greater and 4.0 mm or less.

  Further, in the above-described depression side groove 30A, the depths h3 and h4 of the tread portion from the tread surface 100 may be configured to be 0 mm or more and 2.0 mm or less.

  According to the tire according to the first modified example, ice powder generated during braking on the ICE road surface is discharged by the recess 20 formed around the stud hole 10 and then from the widthwise groove 3 through the step-side groove 30A. Since it can be discharged, it is possible to avoid the adhesion of ice powder to the periphery of the spike pin and the inhibition of the penetration of the spike pin into the ICE road surface, and the deterioration of ICE performance and robustness can be avoided.

(Modification 2)
Hereinafter, with reference to FIG.7 and FIG.8, it demonstrates paying attention to difference with the tire which concerns on the above-mentioned 1st Embodiment about the tire which concerns on the modification 2 of this invention.

  As shown in FIG. 7, in the tire according to the modified example 2, a kick-out side groove 30 </ b> B that is connected from the recess 20 provided in the block 4 to the width direction groove 3 on the tire kick-out side A <b> 1 of the block 4 is formed. Yes.

  Here, as shown in FIG. 7, a plurality of such kick-out side grooves 30B may be provided, or only one may be provided.

  Further, the kick-out side groove 30B may be configured to be inclined with respect to the tire circumferential direction L by a predetermined angle θ2. Here, the predetermined angle may be configured to be 0 ° to 70 °.

  As shown in FIG. 8, the kick-out side groove 30 </ b> B is configured such that the depth of the tread portion from the tread surface 100 increases as the distance from the stud hole 10 in the tire width direction W increases. (H5 <h6).

  According to such a configuration, it is possible to avoid a decrease in the amount of ice powder to be discharged while securing the block rigidity around the stud hole 10.

  Here, the length W2 of the kick-out side groove 30B in the tire width direction W may be configured to be 1.0 mm or greater and 4.0 mm or less.

  Further, in the above-described kick-out side groove 30B, the depths h5 and h6 of the tread portion from the tread surface 100 may be configured to be 0 mm or more and 2.0 mm or less.

  Note that, in the tire according to the second modification example, in addition to the above-described kick-out side groove 30B, a stepping-side groove 30A provided in the tire according to the first modification example may also be formed.

  According to the tire according to the second modified example, ice powder generated at the time of traction on the ICE road surface is discharged by the recess 20 formed around the stud hole 10, and then from the width direction groove 3 via the step-side groove 30A. Since it can be discharged, it is possible to avoid the adhesion of ice powder to the periphery of the spike pin and the inhibition of the penetration of the spike pin into the ICE road surface, and the deterioration of ICE performance and robustness can be avoided.

(Modification 3)
Hereinafter, with reference to FIG. 9, a tire according to Modification 3 of the present invention will be described focusing on differences from the tires according to the first embodiment, Modification 1 and Modification 2 described above.

  As shown in FIG. 9, in the tire according to the modified example 3, the circular groove 40 is formed on the tread surface 100 of the tread portion, and the stud hole 10 is formed on the bottom surface 200 of the groove 40.

  Further, a recess 20 is formed around the stud hole 10 on the bottom surface 200 of the groove 40. For example, the concave portion 20 may be formed so as to surround the entire stud hole 10 in an annular shape, or may be formed so as to surround a part of the stud hole 10 in an annular shape.

  Next, in order to clarify the effect of the present invention, results of tests performed using tires according to comparative examples and examples will be described. In addition, this invention is not limited at all by these examples.

  In this test, all tire sizes and pattern design factors were the same. Here, in this test, the size of all tires was “205 / 55R16”.

  Moreover, in this test, the stud hole 10 shall be formed in 96 places in all the tires.

  Here, in the test, the tire according to the comparative example is not formed with the above-described recess 20, and the tire according to the example is formed with the above-described recess 20.

  In this test, on the ICE road surface, the friction coefficient μ (braking performance) when changing from 20 km / h to 0 km / h, and the driving distance (traction performance) when changing from 0 km / h to 20 km / h. Evaluated.

Table 1 shows the results of this test. The evaluation results of the brake performance and the traction performance are indicated by an index. The larger the index, the better the brake performance and the traction performance.

  According to this test result, it can be seen that the brake performance and traction performance of the tire according to the example having the configuration of the present invention are superior to the brake performance and traction performance of the tire according to the comparative example.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

2 ... circumferential groove, 3 ... width direction groove, 4 ... block, 10 ... stud hole, 20 ... recess, W ... width direction, L ... circumferential direction, 30A ... stepping side groove, 30B ... kicking side groove

Claims (7)

A tire having a tread portion,
On the tread surface, a stud hole for embedding a spike pin is formed,
In the tread surface of the tread portion, a recess is formed around the stud hole,
In the tread portion, a block defined by a circumferential groove extending in the tire circumferential direction and a width groove extending in the tire width direction is provided,
A stepping-side groove that is connected from the recess to the widthwise groove on the tire stepping side of the block is formed;
The stepping side groove is configured to be inclined by a predetermined angle with respect to the tire circumferential direction,
The tire is configured such that, in the stepping side groove, the depth from the tread portion of the tread portion increases as the distance from the stud hole in the tire width direction increases. A tire having a tread portion,
A circular groove is formed on the tread surface.
A stud hole for embedding a spike pin is formed on the bottom surface of the groove,
In the bottom surface of the groove, a recess is formed around the stud hole,
In the tread portion, a block defined by a circumferential groove extending in the tire circumferential direction and a width groove extending in the tire width direction is provided,
A stepping-side groove that is connected from the recess to the widthwise groove on the tire stepping side of the block is formed;
The stepping side groove is configured to be inclined by a predetermined angle with respect to the tire circumferential direction,
The tire is configured such that, in the stepping side groove, the depth from the tread portion of the tread portion increases as the distance from the stud hole in the tire width direction increases. The tire according to claim 1, wherein the stepping-side groove is formed only on a tire stepping side of the block, and is not formed on a tire kicking side of the block. The tire according to claim 1 or 2, wherein a plurality of the stepping side grooves are provided in the tire width direction. A tire having a tread portion,
A circular groove is formed on the tread surface.
A stud hole for embedding a spike pin is formed on the bottom surface of the groove,
In the bottom surface of the groove, a recess is formed around the stud hole,
In the tread portion, a block defined by a circumferential groove extending in the tire circumferential direction and a width groove extending in the tire width direction is provided,
A kick-out side groove that is connected from the recess to the width direction groove on the tire kick-out side of the block is formed,
The kick-out side groove is configured to be inclined by a predetermined angle with respect to the tire circumferential direction,
The tire is configured such that the depth from the tread portion of the tread portion increases as the distance from the stud hole in the tire width direction increases in the kick-out side groove. The kick-out side groove is tire according to claim 5 is formed only on the tire kick-side of the block, the tire depression side of the block is characterized by not formed. The tire according to claim 5 or 6, wherein a plurality of the kick-out side grooves are provided in the tire width direction.

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