Gwangsan gu, South Korea
Gwangsan gu, South Korea

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Disclosed are a method for determining pitches of cooling fins (104) for a pneumatic tire so that the heat dissipation performance of the sidewall (102) may be improved and an airflow noise generated by a high speed air may be decreased, and a pneumatic tire (100) including the cooling fins arranged by the same. The method for determining pitches of cooling pins for a pneumatic tire, including: selecting a total number of cooling fins, the number of pitch-types, and a size of each pitch; generating a random number and arranging each type of pitch sequentially by the generated random number to produce a random pitch arrangement; Fourier transforming the obtained pitch arrangement to calculate a result value (FT); and repeatedly performing the steps of producing a random pitch arrangement and calculating the FT to determine a pitch arrangement when a change in amplitude of the FT is smallest, wherein the cooling fin includes a first bar part (110) and a second bar part (106) which are connected with each other at an acute angle, wherein the second bar part is formed to be inclined in the radial direction of the tire, and an end portion of the second bar part is disposed closer to a center of rotation of the tire than an end portion of the first bar part in the radial direction of the tire.


Patent
Kumho Tire Co. | Date: 2016-02-03

The present invention provides a pneumatic tire (100) including a tread portion (110), a cap ply (120), a carcass (130), an apex (150), a bead (140), a side portion (170), and a belt (180) and having asymmetrical structure with respect to a central line C in a width direction. Moreover, the pneumatic tire includes the technical feature that outer diameters of a left side and a right side are equal, while rim diameters (D1,D2) of the left side and the right side are different, and thicknesses (T1,T2) of the left side portion and the right side portion are different.


Patent
Kumho Tire Co. | Date: 2015-07-23

The present invention provides a pneumatic tire including a tread portion, a cap ply, a carcass, an apex, a bead, a side portion, and a belt and having asymmetrical structure with respect to a central line C in a width direction. Moreover, the pneumatic tire includes the technical feature that outer diameters of a left side and a right side are equal, while rim diameters of the left side and the right side are different, and thicknesses of the left side portion and the right side portion are different.


The present disclosure defines a cap play (20) for a pneumatic tire (20) comprising a film layer (201), a coating layer (202) configured to surround an outer surface of the film layer (201) and a rubber topping layer (203) configured to surround an outer surface of the coating layer (202).


Disclosed is a pneumatic radial tire for a passenger car having ultra fine steel cords (100) for a carcass ply in which adhesive force between a carcass ply layer and a side wall or a rim flange rubber adjacent to a turn up portion on an outside and a stiffness of the rim flange rubber are larger than a bending stiffness of the carcass ply layer so as to improve durability of a bead part while reducing poor air inletting generated at a carcass turn up portion.


Patent
Kumho Tire Co. | Date: 2015-10-28

The present invention relates to a cavity noise reduction tire (1) comprising a sound-absorbing insert (5), more particularly to a cavity noise reduction tire (1) having a ratio of the cross-sectional area of the sound-absorbing insert (5) to the cross-sectional area of the space formed by the internal surface of the tire (1) which is to be about 23-29%.


Disclosed is a pneumatic radial tire for a passenger car having ultra fine steel cords for a carcass ply in which adhesive force between a carcass ply layer and a side wall or a rim flange rubber adjacent to a turn up portion on an outside and a stiffness of the rim flange rubber are larger than a bending stiffness of the carcass ply layer so as to improve durability of a bead part while reducing poor air inletting generated at a carcass turn up portion.


The present disclosure is directed to a cap ply for a pneumatic tire. The cap ply includes a film layer, a coating layer configured to surround an outer surface of the film layer and a rubber topping layer configured to surround an outer surface of the coating layer.


Patent
Kumho Tire Co. | Date: 2015-01-07

Pneumatic tire including a sipe formed in a tread block capable of minimizing slippage on a snowy or icy road while increasing rigidity of the tread block, thereby significantly improving braking and steering performances on wet and dry roads. The sipe comprises a first and a second sipe wall facing each other. The first sipe wall includes a plurality of upper protrusions extending from the surface of the tread block to a lower side thereof, a plurality of lower protrusions extending from the bottom of the sipe to an upper side thereof, and intermediate convex protrusions disposed between the upper and the lower protrusion in a radial direction of the tread block. The second sipe wall is formed with a phase difference of 1/2 of a pitch of the upper protrusion or the lower protrusion with respect to the first sipe wall so as to engage with the latter.


Patent
Kumho Tire Co. | Date: 2015-01-21

A cavity noise reduction tire comprises a tread portion, a bead assembly being disposed at each side of the tread portion, and a sidewall portion for connecting the tread portion and the bead assembly. The tire has a ratio of the cross-sectional area of the sound-absorbing material to the cross-sectional area of the space formed by the internal surface of the tire which is to be about 23-29%.

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