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Pneumatic tireRelated Patent Categories: Resilient Tires And Wheels, Tires, Resilient, Anti-skid Devices, Tread, Having Tread Sections (e.g., Base-cap, Etc.) Containing Different Specified Physio-chemical Properties (e.g., Hysteresis, Modulus, Hardness, Etc.) Or CompositionsPneumatic tire description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20050284554, Pneumatic tire. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to a pneumatic tire, more particularly to an improved internal tread structure including a tread rubber having a specific hardness distribution. [0002] In recent years, from a point of view of environmental conservation, automobile tires are strongly required to reduce the rolling resistance to decrease the fuel consumption. [0003] Hitherto, in order to reduce the rolling resistance of a pneumatic tire, the tread rubber is provided with a two-layered structure in which the hardness of the radially outer layer is increased more than the radially inner layer. In this tread structure, however, there is a tendency to decrease the steering stability during cornering, and it is difficult to improve the high-speed durability and high-speed grip performance so as to satisfy the recent severe requirements. [0004] It is therefore, an object of the present invention to provide a pneumatic tire, in which not only the rolling resistance but also other tire performance such as steering stability, high-speed durability, grip performance, ride comfort and the like are improved. [0005] According to the present invention, a pneumatic tire comprises [0006] a tread portion with a tread face, [0007] a pair of sidewall portions, [0008] a pair of bead portions, [0009] a carcass extending between the bead portions, [0010] a belt made of cords disposed radially outside the carcass in the tread portion, [0011] a tread rubber disposed radially outside the belt and having a multi-layered structure including [0012] a radially outmost cap tread rubber defining said tread face and a base tread rubber disposed radially inside the cap tread rubber, said base tread rubber including a central base tread rubber centered on the tire equator and a side base tread rubber disposed on each side of the central base tread rubber so as to extend from a position axially inwards to a position axially outwards of an axial edge of the belt, [0013] the tread rubber having one of the following hardness distributions (a) and (b): [0014] (a) the side base tread rubber being hardest in the tread rubber, and the cap tread rubber having a hardness of from 53 to 63 degrees, the central base tread rubber having a hardness of from 45 to 60 degrees, and the side base tread rubber having a hardness of from 65 to 75 degrees; [0015] (b) the side base tread rubber being softest in the tread rubber, and the cap tread rubber having a hardness of 60 to 80 degrees, the central base tread rubber having a hardness of from 65 to 75 degrees, and the side base tread rubber having a hardness of from 45 to 60 degrees, [0016] wherein the hardness is measured with a type-A durometer according to Japanese Industrial Standard K6253. [0017] Embodiments of the present invention will now be described in detail in conjunction with the accompanying drawings. [0018] FIG. 1 is a cross sectional view of a pneumatic tire according to the present invention. [0019] FIGS. 2A and 2B show band cords. [0020] FIG. 3 is a cross sectional view of an extruded unvulcanized tread rubber. [0021] In the drawings, pneumatic tire 1 according to the present invention comprises a tread portion 2, a pair of sidewall portions 3, a pair of bead portions 4 each with a bead core 5 therein, a carcass 6 extending between the bead portions 4, and a tread reinforcing belt 9 disposed radially outside the carcass 6 in the tread portion 2. [0022] The tire 1 shown in FIG. 1 is a passenger car tire having an aspect ratio of not more than less than 60%. Here, the aspect ratio is measured under a normally inflated unloaded state. The normally inflated unloaded state is such that the tire is mounted on a standard rim and inflated to a standard load but loaded with no tire load. The undermentioned tread width TW is the maximum axial width between the edges E (hereinafter the "tread edge") of the ground contacting area under a standard loaded condition in which the tire is mounted on the standard rim and inflated to the standard load and then loaded with a standard load. The standard rim is the "standard rim" specified in JATMA, the "Measuring Rim" in ETRTO, the "Design Rim" in TRA or the like. The standard pressure is the "maximum air pressure" in JATMA, the "Inflation Pressure" in ETRTO, the maximum pressure given in the "Tire Load Limits at Various Cold Inflation Pressures" table in TRA or the like. In case of passenger car tires, however, 180 kPa is used as the standard pressure. The standard load is the "maximum load capacity" in JATMA, the "Load Capacity" in ETRTO, the maximum value given in the above-mentioned table in TRA or the like. [0023] The carcass 6 comprises at least one ply 6A of cords arranged radially at an angle of 75 to 90 degrees with respect to the tire equator C. The carcass ply 6A extends between the bead portions through the tread portion 2 and sidewall portions 3 and is turned up around the bead core in each bead portion from the inside to the outside of the tire so as to form a pair of turned up portions 6b and a main portion 6a therebetween. For the carcass cords, organic fiber cords, e.g. polyester, nylon, rayon and the like are used. But it is also possible to use steel cords. In this example, the carcass 6 is composed of a single ply 6A of polyester cords arranged at 90 degrees. [0024] The turned up portions 6b of the carcass ply 6A extend radially outwards beyond the maximum section width point of the carcass main into the tread portion 2 and the outer end 6be of turned up portion 6b is secured between the belt 9 and the carcass main. Continue reading about Pneumatic tire... Full patent description for Pneumatic tire Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pneumatic tire patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Pneumatic tire or other areas of interest. ### Previous Patent Application: Method for forming a green tread rubber and a pneumatic tire formed by using green tread rubber Next Patent Application: Quick-fit anti-skid system for vehicle wheels and associated device for fixing to the wheel Industry Class: Resilient tires and wheels ### FreshPatents.com Support Thank you for viewing the Pneumatic tire patent info. IP-related news and info Results in 0.16487 seconds Other interesting Feshpatents.com categories: Qualcomm , Schering-Plough , Schlumberger , Seagate , Siemens , Texas Instruments , 174 |
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