KR101408009B1 - Pneumatic tire having oil sheets - Google Patents

Abstract

The present invention relates to a pneumatic tire including an oil sheet, and includes an oil sheet positioned between a bead portion mounted on a rim and a sidewall and capable of contacting a rim flange of the rim.
The oil sheet includes 100 parts by weight of raw rubber, 20 to 70 parts by weight of oil, and 0.1 to 10 parts by weight of an antioxidant.

Description

{PNEUMATIC TIRE HAVING OIL SHEETS}

The present invention relates to a pneumatic tire comprising an oil sheet. More particularly, to a pneumatic tire including an oil sheet capable of contacting a rim flange of a tire.

Generally, a tire is one of the components constituting an automobile and directly contacts the road surface. The air inside the tire absorbs the shock caused by the unevenness of the road surface by applying a buffering action like a spring, thereby enhancing the ride feeling.

Such a tire includes a tread which is a rubber layer in contact with the road surface, a side wall connected to the tread and forming a side surface of the tire, a bead connected to the side wall and fixed to the rim of the vehicle A carcass which is installed in the inside of the tire and forms a skeleton with a high fatigue resistance against the bending motion of the side wall and a carcass which is disposed between the tread and the carcass to protect the carcass, And a belt for improving the rigidity of the belt.

During the running of the vehicle, the bead portion is deformed by the bending motion of the sidewall to periodically contact the rim. That is, as shown in FIG. 1B, when the tread is grounded on the road surface and the sidewall 10 undergoes a bending motion, the boundary point P between the bead portion 20 and the sidewall 10 contacts the rim flange 3). 1 (a), when the tread falls on the road surface, the boundary point P is separated from the end of the rim flange 3.

The boundary point P between the bead portion 20 and the sidewall 10 is repeatedly brought into contact with the end portion of the rim flange 3 to cause friction between the rim flange 3 and the boundary point P .

This friction adversely affects the durability of the rim 1 and the deformation of the tire.

Patent Document 10-0345746 (Structure for Preventing Thermal Deformation of Tire Bead) 2002.07.10.

The present invention provides a technique for minimizing rim wear caused by friction between a bead portion of a pneumatic tie and a rim flange.

The pneumatic tire according to an embodiment of the present invention includes an oil sheet positioned between a bead portion mounted on a rim and a sidewall and capable of contacting a rim flange of the rim.

Wherein one end of the oil sheet is positioned within a range of 90% to 110% of the length of the rim flange from the boundary between the bead base and the bead heel of the bead, and the other end of the oil sheet is located at a position between the bead base of the bead base and the bead heel Of the rim flange length from the boundary.

A receiving groove for receiving the oil sheet is formed between the bead and the sidewall, and the outer surface of the oil sheet may be coplanar with the outer surface of the bead and the sidewall.

The thickness T of the oil sheet 30 accommodated in the receiving groove 40 may be 0.1 mm to 10 mm. Wherein the pneumatic tire comprises a first fixing portion extending from the bead heel in the direction of the receiving groove to cover one end surface of the oil sheet and a second fixing portion extending in the direction of the receiving groove in the side wall, And a second fixing part covering the first fixing part.

The oil sheet may have a thickness of 0.1 mm to 10 mm.

The oil sheet may include 100 parts by weight of raw rubber, 20 to 70 parts by weight of oil, and 0.1 to 10 parts by weight of an antioxidant.

The oil sheet may further comprise 1 to 8 parts by weight of a foaming agent.

According to the embodiment of the present invention, when the oil sheet is bent and spread, the fluid contained in the oil sheet is put between the bead heel and the rim flange. The friction between the rim flange and the bead is reduced by the fluid that has been put in order to prevent the wear of the rim flange.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a state in which a boundary portion between a bead portion and a sidewall of a pneumatic tire comes into contact with a rim flange and falls. Fig.
2 is a cross-sectional view of a pneumatic tire according to an embodiment of the present invention mounted on a rim;
3 is an enlarged view of a portion A shown in Fig.
4 is an exploded cross-sectional view of the bead shown in Fig.
Fig. 5 is a sectional view showing a state in which the oil sheet shown in Fig. 2 is in contact with the rim flange and falls. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like parts are designated with like reference numerals throughout the specification.

The pneumatic tire according to an embodiment of the present invention will now be described with reference to Figs. 2 to 5. Fig.

FIG. 2 is a cross-sectional view of a pneumatic tire according to an embodiment of the present invention mounted on a rim, FIG. 3 is an enlarged view of a portion A shown in FIG. 2, Sectional view.

2, the pneumatic tire according to the present embodiment includes a bead base 21 abutting the rim base 2 and a bead base 21 abutting the rim flange 3 when the tire is mounted on the rim 1, 22 at a boundary point (P) of the oil sheet (30). In other words, the oil sheet 30 is positioned between the bead portion 20 mounted on the rim 1 and the side wall 10 acting on the vehicle.

The oil sheet 30 is formed entirely along the circumferential direction of the tire. However, they may be formed in a bar shape and disposed perpendicularly to the circumferential direction of the tire and spaced apart along the circumferential direction of the tire.

One end 31 of the oil sheet 30 is positioned between 90% and 110% of the length h of the rim flange 3 at the boundary 23 between the bead base 21 of the bead portion 20 and the bead heel 22. [ Lt; / RTI > For example, when the length h of the rim flange 3 is assumed to be 10 mm, the distance h1 at which the one end portion 31 of the oil sheet 30 is separated from the boundary 23 may be 9 mm to 11 mm. Accordingly, when the distance h1 is 9 mm, the one end 31 of the oil sheet 30 can be overlapped with the end of the rim flange 3 when the tire is mounted on the rim 1. However, when the distance h1 is 11 mm, the one end 31 of the oil sheet 30 is not overlapped with the rim flange 3 but is separated. In this case, one end of the oil sheet 30 can be brought into contact with the rim flange 3 during the swaying motion of the sidewall 10.

The other end portion 32 of the oil sheet 30 is located within the range of 200% of the length h of the rim flange 3 at the boundary 23 between the bead base 21 of the bead portion 20 and the bead heel 22 Located. For example, if the length h of the rim flange 3 is 10 mm, the distance h2 between the other end 32 of the oil sheet 30 and the boundary 23 may be 19 mm to 21 mm. The other end portion 32 of the oil sheet 30 is separated from the end of the rim flange 3. The oil sheet 30 whose other end portion 32 is separated from the rim flange 3 can come into contact with the upper surface and the side surface which are the ends of the rim flange 3 during the swaying motion of the sidewall 10.

3 and 4, a receiving groove 40 for receiving the oil sheet 30 is formed at the boundary point P between the bead heel 22 and the sidewall 10. When the oil sheet 30 is received in the receiving groove 40, the outer surface of the oil sheet 30 is located on the same plane as the outer surface of the bead heel 22 and the outer surface of the sidewall 10. The oil sheet 30 does not project further in the direction of the rim flange 3 than the outer surface of the bead heel 22 and the sidewall 10. There is no space between the bead heel 22 and the rim flange 3 because the oil sheet 30 is located on the same plane as the bead heel 22. [

The first fixing part 41 extends from the bead heel 22 in the direction of the receiving groove 40. The first fixing portion 41 extends over the outer surface of the bead heel 22 to cover the outer surface of the one end 31 of the oil sheet 30. [ The one end 31 of the oil sheet 30 can be fixed by the first fixing portion 41. [

Further, the second fixing portion 42 extends from the side wall 10 in the receiving groove direction. The second fixing portion 42 extends over the outer surface of the sidewall 10 to cover the outer surface of the other end 32 of the oil sheet 30. The other end (32) of the oil sheet (30) can be fixed by the second fixing portion (42). The first fixing portion 41 and the second fixing portion 42 can be firmly fixed so as not to be separated from the receiving groove 40. However, the first fixing part 41 and the second fixing part 42 may be omitted.

The thickness T of the oil sheet 30 accommodated in the receiving groove 40 may be 0.1 mm to 10 mm. When the oil sheet 30 is formed to be 0.1 mm or less, it can be torn easily during the bending motion. When the oil sheet 30 is formed to be 10 mm or more, the position of a chain (not shown) that protects the cord can be changed by preventing direct contact between the rim and the carcass.

Further, preferably, the thickness T of the oil sheet 30 may be 1 mm to 5 mm. In the above-mentioned range, the sheet is not torn even in the bending motion, the position of the body wave is not changed, and the most excellent effect for prevention of the wrinkle is exhibited.

Such an oil sheet 30 includes a fluid. The fluid is put between the bead heel 22 and the rim flange 3 during the bending motion of the side wall 10 to minimize the friction coefficient between the bead portion 20 and the rim flange 3. [

The oil sheet 30 includes 100 parts by weight of raw rubber, 20 to 70 parts by weight of oil, and 0.1 to 10 parts by weight of an antioxidant.

The raw material rubber is not particularly limited in the present invention, but may be any one selected from the group consisting of natural rubber, synthetic rubber, and combinations thereof.

The natural rubber may be a general natural rubber or a modified natural rubber.

The above-mentioned general natural rubber may be used as long as it is known as natural rubber, and the country of origin and the like are not limited. The natural rubber includes cis-1,4-polyisoprene as a main component, but may also include trans-1,4-polyisoprene depending on required characteristics. Therefore, in addition to natural rubber containing cis-1,4-polyisoprene as a main component, natural rubber including trans-1,4-isoprene as a main component, such as balata, Rubber may also be included.

The modified natural rubber means that the general natural rubber is modified or purified. Examples of the modified natural rubber include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), hydrogenated natural rubber and the like.

The synthetic rubber may be at least one selected from the group consisting of styrene butadiene rubber (SBR), modified styrene butadiene rubber, butadiene rubber (BR), modified butadiene rubber, chlorosulfonated polyethylene rubber, epichlorohydrin rubber, fluorine rubber, silicone rubber, Butadiene rubber, nitrile rubber, nitrile butadiene rubber (NBR), modified nitrile butadiene rubber, chlorinated polyethylene rubber, styrene ethylene butylene styrene (SEBS) rubber, ethylene propylene rubber, ethylene propylene diene (EPDM) rubber, Ethylene vinyl acetate rubber, acrylic rubber, hydrin rubber, vinyl benzyl chloride styrene butadiene rubber, bromomethyl styrene butyl rubber, maleic styrene butadiene rubber, carboxylic styrene butadiene rubber, epoxy isoprene rubber, ethylene propylene rubber maleic acid, Nitrile butadiene rubber It may be a p-methyl styrene (brominated polyisobutyl isoprene-co-paramethyl styrene, BIMS), and one selected from the group consisting of -, bromo mineyi suited polyisobutyl isoprene-co.

The raw material rubber may be any one selected from the group consisting of styrene butadiene rubber (SBR), butadiene rubber (BR), and combinations thereof. The styrene butadiene rubber may be an emulsion polymerized styrene butadiene rubber (Hereinafter referred to as "E-SBR"), solution polymerized styrene butadiene rubber (hereinafter referred to as "S-SBR"), and combinations thereof. But is not limited thereto.

The oil (fluid) is used for reducing the friction due to bending motion during running, and may be selected from the group consisting of petroleum oil, plant oil, and combinations thereof, but the present invention is not limited thereto .

The petroleum-based oil may be selected from the group consisting of paraffinic oil, naphthenic oil, aromatic oil, and combinations thereof. Examples of the vegetable oil include vegetable oils such as castor oil, cottonseed oil, linseed oil, canola oil, soybean oil, palm oil, palm oil, peanut oil, pine oil, pine tar, tall oil, konyu, rice bran oil, safflower oil, sesame oil, , Camellia oil, jojoba oil, macadamia nut oil, four flower oil, tung oil, and combinations thereof.

The oil is contained in an amount of 20 to 70 parts by weight based on 100 parts by weight of the raw rubber. If the oil content is less than 20 parts by weight, the friction reduction effect is lowered. If the oil content is more than 70 parts by weight, a problem may occur in the direct contact between the rim and carcass. Also, preferably, the oil may be included in an amount of 30 to 65 parts by weight, and the friction reducing effect on the wheel is excellent according to the range, but does not affect the rim and carcass contact.

The antioxidant is an additive used for stopping the chain reaction in which the oil sheet is autoxidized by oxygen. As the anti-aging agent, any one selected from the group consisting of an amine type, a phenol type, a quinoline type, an imidazole type, a carbamic acid metal salt, a wax and a combination thereof can be appropriately selected and used. Further, since the wax is low in volatility and shows inactivity with respect to the raw material rubber, it is preferable to use wax as the aging inhibitor.

The antioxidant is included in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the starting rubber. If the amount of the antioxidant is less than 0.1 parts by weight, the effect of preventing oxidation may be deteriorated. If the amount of the antioxidant is more than 10 parts by weight, problems may occur due to volatilization of the antioxidant.

The oil sheet 30 may further include a foaming agent. Since the bead portion 20 is deformed in proportion to the load of the automobile, the range in which the deformed bead portion 20 contacts the wheel is also proportional to the load of the automobile. Therefore, when the foaming agent is used, pores are formed in the oil sheet, and the amount of oil can be appropriately adjusted according to the vehicle load by containing the oil in the pores.

The foaming agent may be any conventionally used foaming agent. Specifically, the foaming agent may be any one selected from the group consisting of an inorganic foaming agent, a nitroso-based foaming agent, an azo-based foaming agent, a sulfonylhydrazide-based foaming agent, an azide-based foaming agent, and combinations thereof, It is not.

The foaming agent is contained in an amount of 1 to 8 parts by weight based on the raw rubber. By weight, the amount of foaming is too small, and pores to be contained in the oil are hardly produced. If it is used in excess of 8 parts by weight, the production of foamed foam becomes too large, and the physical properties of rubber such as abrasion resistance may be abruptly lowered.

In addition, a foaming auxiliary may be optionally used together with the foaming agent. When the foaming auxiliary is used together with the foaming agent, there is an advantageous effect in terms of lowering the decomposition temperature of the foaming agent, accelerating the decomposition, and uniformizing the bubbles.

The organic acid may be any one selected from the group consisting of salicylic acid, phthalic acid, stearic acid, oxalic acid, and combinations thereof. The organic acid may be selected from the group consisting of organic acids, urea, urea derivatives and combinations thereof. have.

Next, the operation of the pneumatic tire described above will be described with reference to Fig.

5 (a) is a schematic view showing a state in which the tread of the tire is separated from the road surface and the oil sheet is separated from the rim flange. Fig. 5 (b) shows a state in which the tread is in contact with the road surface, Fig.

The bead heel 22 is brought into contact with the rim flange 3 when a tire in which the oil sheet 30 is placed at the boundary point P between the bead heel 22 and the sidewall 10 is mounted on the rim 1. [ At this time, one end of the oil sheet 30 may be overlapped with the end of the rim flange 3, or may be located near the end of the rim flange 3.

When the vehicle travels in this state, when the tread contacts the road surface, the side wall 10 adjacent to the tread performs a bending motion. As shown in Fig. 5B, the side wall 10 and the neighboring oil sheet 30 are bent by the bending motion of the side wall 10. The outer surface of the bent oil sheet (30) is in contact with the end surface of the rim flange (3).

And the sidewall 10, which is tilted from the road surface, is returned to the original state, and the oil sheet 30 is expanded as shown in a) of Fig. 5).

Thus, when the oil sheet is bent and spread, the fluid contained in the oil sheet 30 is put between the bead heel 22 and the rim flange 3. The friction coefficient between the rim flange 3 and the bead portion is reduced by the fluid that has been put in order to prevent the wear of the rim flange 3.

On the other hand, when the wear of the rim flange 3 is large, even if the new tire is replaced, the bead portion of the new tire is deformed by the worn dimension of the rim flange 3, so that the durability of the tire is decreased. However, according to the present invention, abrasion of the rim flange 3 by the fluid put on the oil sheet 30 is prevented, so that deformation of the bead portion of the new tire can be reduced.

Further, in the case of a heavy duty tire, high air pressure is used, which causes a large load to be applied to the rim 1. Especially, in case of tubeless rim, the possibility of tire separation and rim breakage is higher than tube type. However, the coefficient of friction between the bead heel 22 and the rim flange 3 is reduced by the fluid in the oil sheet 30, so that the wear of the rim flange 3 is prevented, thereby improving the durability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

1: rim 2: rim base 3: rim flange
10: sidewall
20: bead portion
21: bead base 22: bead heel 23: boundary
30: oil sheet 31: one end 32: other end
40: receiving groove
41: first fixing portion 42: second fixing portion
P: boundary point

Claims (7)

An oil sheet positioned between a bead portion mounted on the rim and the sidewall and capable of contacting the rim flange of the rim;
A receiving groove formed between the bead portion and the side wall and receiving the oil sheet;
A first fixing portion extending from the bead heel of the bead portion toward the receiving groove to cover one end surface of the oil sheet; And
A second fixing part extending from the sidewall in the receiving groove direction and covering the other end surface of the oil sheet;
/ RTI >
Wherein the outer surface of the oil sheet is located on the same plane as the outer surface of the bead portion and the side wall,
One end of the oil sheet
Wherein the bead base is located within a range of 90% to 110% of the length of the rim flange from a boundary of the bead base and the bead heel.
The method of claim 1,
The other end of the oil sheet
Is located within a range of 200% of the length of the rim flange from the boundary between the bead base of the bead portion and the bead heel
A pneumatic tire comprising an oil sheet.
delete The method of claim 1,
Wherein the thickness of the oil sheet is 0.1 mm to 10 mm.
delete The method of claim 1,
The oil sheet
100 parts by weight of the raw rubber,
20 to 70 parts by weight of oil, and
0.1 to 10 parts by weight of an antioxidant
Wherein the pneumatic tire comprises an oil sheet. The method of claim 6,
Wherein the oil sheet further comprises 1 to 8 parts by weight of a foaming agent.

Images