KR20240076611A - Stud for tire and tire comprising the same - Google Patents

Abstract

The present invention relates to a tire stud containing a hygroscopic material and a tire containing the same. The tire containing the tire stud exhibits behavior similar to that of a general tread compound on dry and wet road surfaces, prevents road surface damage, and resists damage at sub-zero temperatures. On icy and snowy roads, the rigidity of the hygroscopic material that absorbs moisture increases and acts as a stud, thereby improving the braking performance of the tire.

Description

Tire studs and tires containing the same {STUD FOR TIRE AND TIRE COMPRISING THE SAME}

The present invention relates to tire studs and tires including the same.

Tires are divided into driving tires used on general roads and snow tires used on snowy or icy roads, depending on the road surface condition.

Driving tires are designed and manufactured to have excellent grip with the road surface when driving on normal roads and to allow drivers to enjoy a comfortable ride, and are used in most vehicles.

However, the grip of driving tires on special road surfaces, such as snowy or icy roads, is significantly lower than on general roads, so there is a high possibility of accidents due to slipping. Therefore, unlike regular tires, specially designed snow tires are used on snowy or icy roads to improve grip on snowy or icy roads.

Unlike regular tires, these snow tires are divided into a stud type with steel pillar-shaped tips and a studless type without spikes for driving and braking power on snow and ice, which are common in winter. ) are divided into tires.

However, in the case of this stud type, since the tire is coupled in a fixed shape, it is impossible to adapt to changing environments while driving, resulting in increased damage to the road surface and wear or damage to the tire. For example, on an icy road in the cold winter, steel pillar-shaped studs improve grip with the road surface and prevent slipping, but when the temperature rises and the road surface becomes normal, the studs above can cause shock when the vehicle drives on the road surface. is applied, and when the wheels are driven at high speed, the road surface is damaged by the studs or noise is generated.

Accordingly, the need for studs that can change depending on the surrounding environment or temperature is emerging.

The purpose of the present invention is to prevent road surface damage by exhibiting behavior similar to that of a general tread compound on dry and wet road surfaces, and to brake tires by acting as studs by increasing the rigidity of the hygroscopic material that absorbs moisture on icy and snowy roads at sub-zero temperatures. The goal is to provide tire studs that improve performance.

Another object of the present invention is to provide a tire including the tire stud.

According to embodiments of the present invention for achieving the above-described object, a tire stud including a hygroscopic material is provided.

The hygroscopic material may have a moisture absorption rate of 50% to 90% by weight and a volume change rate of 5% to 50% when the temperature is 0° C. or lower.

The hygroscopic material may include raw rubber and a compound containing an epoxide group.

The compound containing the epoxide group may be epichlorohydrin, ethylene oxide, allyl glycidyl ether, or a combination thereof.

The raw rubber may include styrene butadiene rubber (SBR) and butadiene rubber (BR).

The hygroscopic material may include 50 to 99 parts by weight of raw rubber based on 100 parts by weight of the hygroscopic material.

The hygroscopic material may contain 1 to 50 parts by weight of a compound containing an epoxide group based on 100 parts by weight of the hygroscopic material.

According to another embodiment of the present invention, it is vertically inserted into the tread of a tire and includes a stud hole for attaching a stud and a stud attached to the stud hole, wherein the stud is a stud according to the present invention described above. Tires are provided.

The tire may include 20 to 400 stud holes based on the entire tire.

The stud may have a moisture absorption rate of 50% by weight to 90% by weight, and when the temperature is 0° C. or less, the stud protrudes from the surface of the tire tread to a length of more than 0.0 mm and 2.0 mm or less, and may be provided to have grip with the road surface. there is.

The present invention prevents damage to the road surface by exhibiting similar behavior to a typical tread compound on dry and wet roads, and improves the braking performance of the tire by acting as a stud by increasing the rigidity of the hygroscopic material that absorbs moisture on icy and snowy roads at sub-zero temperatures. Improved tire studs can be provided.

The present invention can also provide a tire including the tire stud.

1 to 3 are schematic diagrams showing a tire including tire studs according to an embodiment of the present invention.
Figure 4 is a graph showing storage modulus according to temperature of a tire stud according to an embodiment of the present invention.

Embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this means not only "directly connected" but also "indirectly connected" with another member in between. "Includes cases where it is. Additionally, when a part is said to “include” a certain component, this does not mean that other components are excluded, but that other components can be added, unless specifically stated to the contrary.

The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, a tire stud according to an embodiment will be described.

The present invention prevents damage to the road surface by exhibiting similar behavior to a typical tread compound on dry and wet roads, and improves the braking performance of the tire by increasing the rigidity of the hygroscopic material that absorbs moisture and acting as a stud on icy and snowy roads at sub-zero temperatures. It is about tire studs that have an improving effect.

Specifically, tire studs according to one embodiment include a hygroscopic material.

In the past, studs installed in snow tires mainly used pins made of high-strength metal, and the pins always protruded toward the road surface to increase driving force and braking force when driving on icy and snowy roads.

However, when the above-mentioned studs are installed on a tire, there is a drawback in that the stud pins not only damage the road surface but also generate a lot of noise on non-icy and snowy roads.

In order to reduce damage to the road surface, studs have been provided that allow the pins of the stud to be removed on non-icy and snowy roads, and the studs can be reinstalled on icy and snowy roads. However, not only is it not easy to remove the stud pin from the tire or re-insert the stud pin, but if the pin hole formed in the stud is filled with dirt or sand, it becomes difficult to install the pin in the stud. There is.

To solve this problem, a prior art has also been proposed in which the bottom of the stud pin is filled with a propellant whose volume expands when the temperature decreases. However, this has the limitation of not being able to prevent road surface damage on low-temperature, non-icy and snowy roads.

The present invention was devised to solve the above problems. By making tire studs contain hygroscopic materials, the role of the studs is limited by exhibiting behavior similar to that of rubber in the tread part of a tire on a dry road surface at room temperature, and On a wet road surface, the hygroscopic material of the stud absorbs moisture from the road surface, which reduces the elasticity of the stud compared to the high part of the tread portion, thereby limiting the role of the stud. On the other hand, on an icy and snowy road surface below 0℃, the moisture absorbed by the hygroscopic material of the stud As a result of freezing, the rigidity increases compared to the surrounding rubber of the tread area, so it can function as a stud.

1 to 3 are schematic diagrams showing tire studs according to an embodiment of the present invention.

Referring to Figures 1 to 3, the tire stud according to the present invention exhibits similar behavior to a typical tread compound on dry and wet road surfaces, prevents road surface damage, and is a hygroscopic material that absorbs moisture on icy and snowy roads at sub-zero temperatures. By increasing the rigidity of the tire and acting as a stud, the braking performance of the tire is improved.

The hygroscopic material may have a moisture absorption rate of 50% to 90% by weight and a volume change rate of 5% to 50% when the temperature is 0° C. or lower.

At this time, the moisture absorption rate may be a value calculated according to Equation 1 below.

[Equation 1]

Moisture absorption rate (%) = (weight increase of hygroscopic material / weight of hygroscopic material)

If the moisture absorption rate of the hygroscopic material is less than 50% by weight, it may not be able to absorb a sufficient amount of moisture from the ice and snow road surface, so it may be difficult to achieve the performance of the studs due to insufficient rigidity even at sub-zero temperatures. If it exceeds 90% by weight, If this is done, the driving performance of the tire may be reduced.

In addition, if the volume change rate of the hygroscopic material is less than 5% at a temperature of 0 ℃ or less, there is a problem in that it is difficult to perform the correct function because the studs cannot protrude from the icy and snowy road surface to the tire tread surface, and if it exceeds 50%, the studs There is a problem in that it is difficult to secure sufficient durability.

The hygroscopic material may be a rubber elastomer that can be applied to tire studs by absorbing moisture from icy and snowy road surfaces, and the hygroscopic material may include raw rubber and a compound containing an epoxide group.

The raw rubber serves as a matrix in tire studs, and may specifically include styrene butadiene rubber (SBR) and butadiene rubber (BR). The raw rubber may be included in an amount of 50 to 99 parts by weight based on a total of 100 parts by weight of the hygroscopic material. If the content of the raw rubber is less than 50 parts by weight, the elasticity or durability of the stud may not be sufficiently secured, and if the content of the raw rubber is less than 50 parts by weight, the elasticity or durability of the stud may not be sufficiently secured. In this case, the moisture absorption rate of the stud may decrease.

The compound containing an epoxide group contained in the hygroscopic material serves to effectively absorb moisture present on the ice and snow road surface by containing an epoxide functional group in the molecule. The compound containing the epoxide group may be included in an amount of 1 to 50 parts by weight based on a total of 100 parts by weight of the hygroscopic material. If the content of the compound containing the epoxide group is less than 1 part by weight, a sufficient amount of moisture is absorbed from the icy and snowy road surface. If this is not done, the performance of the studs may be difficult to achieve due to insufficient rigidity even in sub-zero temperatures, and if it exceeds 50% by weight, the driving performance of the tire may be reduced.

The compound containing the epoxide group may be, for example, epichlorohydrin, ethylene oxide, allyl glycidyl ether, or a combination thereof. Specifically, the hygroscopic material may include 20 to 80 parts by weight of epichlorohydrin, 20 to 80 parts by weight of ethylene oxide, and 20 to 80 parts by weight of allyl glycidyl ether, based on a total of 100 parts by weight of the hygroscopic material. On icy and snowy roads with temperatures of

Another embodiment of the present invention provides a tire including the tire stud.

Referring to Figures 1 to 3, the tire according to this embodiment includes stud holes and studs for attaching studs.

More specifically, it is inserted perpendicularly into the tread of the tire and includes a stud hole for attaching a stud and a stud attached to the stud hole, and the stud may be a stud containing the above-described hygroscopic material. The stud contains a hygroscopic material and is inserted into the stud hole to provide strong grip to the tire when driving on an icy or snowy road.

The tire may include stud holes uniformly distributed based on the entire tire, for example, may include 20 to 400 stud holes, and preferably may include 150 to 300 stud holes. there is.

If the number of stud holes is less than 20, it may be difficult to achieve sufficient braking performance on icy and snowy roads, and if the number of stud holes exceeds 400, it may act as resistance to the tire and reduce driving performance.

In the tire, the studs attached to the stud holes include a hygroscopic material, the studs have a moisture absorption rate of 50% to 90% by weight, and when the temperature is 0° C. or lower, the studs are more than 0.0 mm and 2.0 mm or less from the surface of the tire tread. It may be provided to protrude to a length of and have contact force with the road surface.

As the hygroscopic material contained in the stud absorbs moisture from the icy and snowy road surface and exhibits rigidity at sub-zero temperatures, its volume may change and protrude from the surface of the tire tread. In this case, the diameter of the stud hole is 5 to 20 mm. It may be. If the diameter of the stud hole is less than 5 mm, it is not easy to attach a stud containing a hygroscopic material to the stud hole, and it may be difficult to provide sufficient grip to the tire on an icy or snowy road, and if it exceeds 20 mm, the stud hole The bonding force between the tire and the stud may decrease, and the length of the stud protruding from the tire tread surface may decrease.

In the case of a tire including the studs, the tire tread portion is formed using a tire tread rubber composition constituting the tread portion of the tire, and then a curing process is performed to apply heat and pressure to the composition constituting the tire stud portion to form the tire tread portion. It can be manufactured through a process of attaching the stud through physical force, or by forming a stud hole in the tire tread, molding a tire stud into the intended shape in the formed stud hole, and performing a curing process. However, the method of manufacturing a tire including studs is not limited thereto and may be applied as long as it is a method conventionally used for manufacturing studded tires.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

[Manufacturing example: Manufacture of tire studs]

Tire stud compositions according to the following examples and comparative examples were prepared using the compositions shown in Table 1 below. The tire stud composition was prepared according to a conventional rubber composition manufacturing method.

Comparative Example 1 Example 1 Example 2 Example 3 raw rubber 100 85 80 75 epichlorohydrin 0 5 10 10 ethylene oxide 0 5 5 10 Allyl glycidyl ether 0 5 5 5

[Experimental example: Measurement of physical properties of manufactured tire studs]

Storage modulus according to temperature was measured for the tire stud specimen manufactured in Example 1, and the results are shown in FIG. 4.

The specific measurement conditions are as follows.

(Dynamic mechanical analyzer -80 ~ 60 ^o C, 10Hz, 0.5% strain)

As shown in Figure 4, as a result of measuring the curing behavior of the tire stud manufactured using the composition of Example 1, the tire stud according to the present invention, unlike the stud that does not absorb moisture, begins to increase in modulus from 0 ° C. You can see that

Ultimately, compared to the comparative example, the embodiment according to the present invention shows similar behavior to a general tread compound on dry and wet road surfaces and prevents road surface damage, On icy and snowy roads with sub-zero temperatures, the rigidity of the hygroscopic material that absorbs moisture increases and acts as a stud, which has the advantage of improving the braking performance of the tire.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

Claims (10)

Tire studs containing hygroscopic material.
In paragraph 1:
The hygroscopic material is a tire stud having a moisture absorption rate of 50% to 90% by weight and a volume change rate of 5% to 50% when the temperature is 0° C. or lower.
In paragraph 1:
A tire stud, wherein the hygroscopic material includes raw rubber and a compound containing an epoxide group.
In paragraph 3,
A tire stud, wherein the compound containing the epoxide group is epichlorohydrin, ethylene oxide, allyl glycidyl ether, or a combination thereof.
In paragraph 3,
A tire stud wherein the raw rubber includes styrene butadiene rubber (SBR) and butadiene rubber (BR).
In paragraph 3,
A tire stud, wherein the hygroscopic material includes 50 to 99 parts by weight of raw rubber based on 100 parts by weight of the hygroscopic material.
In paragraph 3,
A tire stud, wherein the hygroscopic material includes 1 to 50 parts by weight of a compound containing an epoxide group based on 100 parts by weight of the hygroscopic material.
It is inserted vertically into the tread of the tire and has stud holes for attaching studs.
Includes a stud attached to the stud hole,
A tire, wherein the stud is a stud according to claim 1.
In paragraph 8:
The tire includes 20 to 400 stud holes based on the entire tire.
In paragraph 8:
The studs have a moisture absorption rate of 50% by weight to 90% by weight, and when the temperature is 0° C. or less, the studs protrude from the surface of the tire tread to a length of more than 0.0 mm and 2.0 mm or less and are provided to have grip with the road surface. In, tire.

Images