KR-20260066956-A - NON-PNEUMATIC TIRE HAVING UNIFORM GROUND PRESSURE STRUCTURE

Abstract

The present invention relates to a non-pneumatic tire having a uniform contact pressure structure that eliminates uneven contact pressure by providing a contact pressure distribution component on the outer side of the spoke, thereby improving drivability and minimizing noise and vibration transmitted to the vehicle. According to the present invention, a non-pneumatic tire is provided, characterized by comprising: a non-pneumatic tire body including a rim portion, a spoke portion, and a tread portion; and a contact pressure distribution member provided on the outer side of the non-pneumatic tire body.

Inventors

• 허정무

Assignees

• 한국타이어앤테크놀로지 주식회사

Dates

Publication Date

20260512

Application Date

20241105

Claims (6)

1. In the case of non-pneumatic tires, A non-pneumatic tire having a uniform contact pressure structure characterized by including a ground pressure distribution member provided on the outer surface of the non-pneumatic tire.
2. A non-pneumatic tire body including a rim, a spoke, and a tread; and A non-pneumatic tire having a uniform contact pressure structure, characterized by including a ground pressure dispersion member provided on the outer side of the above-mentioned non-pneumatic tire body.
3. In paragraph 1 or 2, The above ground pressure dispersion member is provided on the outer surface of the tread portion, and A non-pneumatic tire having a uniform contact pressure structure, characterized in that the above ground pressure dispersion member is formed from a single material or a composite material of rubber or polyurethane.
4. In paragraph 1 or 2, The above ground pressure dispersion member is, A non-pneumatic tire having a uniform contact pressure structure characterized by having at least one cushioning portion among a groove and a cavity formed in at least one direction among the X-axis, Y-axis, and Z-axis, or a composite direction combining two or more.
5. In paragraph 1 or 2, A non-pneumatic tire having a uniform contact pressure structure, characterized in that the above ground pressure dispersion member has a thickness of 10 mm or more.
6. In paragraph 2, A non-pneumatic tire characterized in that the composition forming the ground pressure dispersion member is identical to the composition of the tread portion.

Description

Non-pneumatic tire having a uniform ground pressure structure The present invention relates to a non-pneumatic tire, and more specifically, to a non-pneumatic tire having a uniform contact pressure structure that eliminates uneven contact pressure by providing a ground pressure distribution component on the outer side of the spoke, thereby improving drivability and minimizing noise and vibration transmitted to the vehicle. Pneumatic tires, which are widely used in vehicles, are filled with air to elastically deform according to the road surface, thereby improving ride comfort while driving. However, these pneumatic tires can be damaged due to bumps in the road surface or impacts from driving, and there is a problem in that the air pressure must be checked frequently due to the risk of punctures. As a result, airless tires that do not use compressed air and thus eliminate the need for air pressure checks have been proposed, thereby eliminating the risk of accidents caused by air pressure loss. Meanwhile, tires are mounted on vehicles and perform functions such as supporting the vehicle's load, mitigating road shocks, driving and braking the vehicle, and changing and maintaining the vehicle's direction of travel. However, in order to achieve dynamic performance among these roles, such as driving and braking, and changing and maintaining the direction of travel, it is essential to research tire structures that provide a contact area with the ground under any circumstances. Conventional pneumatic tires utilize a pressure vessel structure of fluid (air) to respond to various changes in the vehicle while driving, thereby enabling the realization of the contact area with the ground, which is the basis of tire performance. While pneumatic tires show changes in contact length and contact width with increasing load, non-pneumatic tires are structured such that only the contact length increases with load while the contact width cannot change; therefore, there is a problem where significant discrepancies occur when designing based on the static characteristics of pneumatic tires. Korean Patent No. 10-2183211 (Title of Invention: Non-pneumatic Tire) comprises a carcass fly coupled along the outer surface of a wheel fixed to a wheel axle, a plurality of cushioning parts formed at regular intervals along the outer surface of the carcass fly and elastically deformed in response to external force, a rubber layer formed along the outer surface of the spoke, and a tire body having a tread formed along the outer surface of the rubber layer. As a related prior art, Japanese Patent Publication No. 2010-538866 (Document 1) relates to a "composite laminated product" and proposes that, in a non-pneumatic tire, a connecting body (16) and a wheel spoke (12) are formed on the outer side of the tire, and such connecting bodies (16) are formed so as not to come into contact with each other, and the wheel spoke (12) is connected to the connecting body (16), thereby providing excellent durability against repetitive forces acting on the tire. FIG. 1 is a drawing showing the structure of a non-pneumatic tire according to Document 1, which is a prior art. In addition, Korean Published Patent Application No. 10-2023-0023087 (Document 2) relates to a "non-pneumatic composite spoke structure" and discloses a structure in which spoke structures having different characteristics are compositely arranged within a single tire. FIG. 2 is a drawing showing the non-pneumatic tire structure of Document 2, which is the prior art. However, conventional non-pneumatic tires with a transverse penetration structure have a problem of generating irregular contact pressure caused by the spoke support and non-support parts. Therefore, a non-pneumatic tire is required that has uniform contact pressure with the ground regardless of the upper spoke shape. Figure 1 is a drawing showing a conventional example of a non-pneumatic tire structure. Figure 2 is a drawing showing a conventional non-pneumatic tire structure of another example. FIG. 3 is a drawing showing an embodiment of a non-pneumatic tire having a uniform contact pressure structure according to the present invention. FIG. 4 is a drawing showing an embodiment in which a ground pressure dispersing member is provided in a non-pneumatic tire body included in a non-pneumatic tire according to the present invention. FIG. 5 is a drawing showing a first embodiment (A), a second embodiment (B), and a third embodiment (C) of a ground pressure distribution member included in a non-pneumatic tire having a uniform ground pressure structure according to the present invention. FIG. 6 is a drawing showing a fourth embodiment (D) and a fifth embodiment (E) of a ground pressure distribution member included in a non-pneumatic tire having a uniform ground pressure structure according to the present invention. FIGS. 7 and FIGS. 8 are drawings showing the results of noise level measurement (80 kph, constant speed driving on a s