# US 11,298,979 B2 · Non-pneumatic tire

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- Number: US 11,298,979 B2
- Document ID: US11298979B2
- Status: Granted
- Kind: B2
- Application number: 16/673,635
- Filed: 2019-11-04
- Published: 2020-05-07
- Granted: 2022-04-12
- Earliest claimed: 2018-11-05
- Assignees: Hankook Tire & Technology Co., Ltd.; Korea Advanced Institute of Science and Technology
- Applicants: Hankook Tire & Technology Co., Ltd; Korea Advanced Institute of Science and Technology
- Inventors: Sung Hee Youn; Seok Ju Choi; Myong Joong Lee; Jeong Mu Heo; Daniel Saakes; Tek Jin Nam; Seung Ryeol Kim; Se Yeong Kim; Yea Kyung Row; Oo Sung Son; Dong Hyeok Yun; Kwang Eun Park; Gi Tae Koo; Jeong Yeon Lee
- Web page: https://patentgrep.com/patent/US11298979B2

## CPC

- B60C 7/20: disposed circumferentially relative to wheel axis
- B60C 7/146: {extending substantially radially, e.g. like spokes}
- B60C 7/18: disposed radially relative to wheel axis
- B60C 7/22: having inlays other than for increasing resiliency, e.g. for armouring
- B60B 1/14: Attaching spokes to rim or hub
- B60B 21/06: characterised by means for attaching spokes {, i.e. spoke seats}
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION

## Abstract

The disclosed technology generally relates to a tire, and more particularly to a non-pneumatic tire that has handling performance similar to a pneumatic tire, supports the load of a vehicle and improves riding comfort by employing a parametric structure. In one aspect, a non-pneumatic tire includes a tread that comes in contact with the ground, a rim that is connected with an axle, and a spoke unit that functions as a structural support between the rim and the tread, in which the spoke unit is formed by circularly arranging spokes. The spokes have a single closed-loop longitudinal cross-section circumscribed to the rim and around the center of the tire.

## Claims

### Claim 1

A non-pneumatic tire assembly comprising:
a tread configured to come in contact with the ground;
a rim connected with an axle; and
a spoke unit that serves as a structural support between the rim and the tread,
wherein the spoke unit is formed by a plurality of spokes circularly arranged around the rim, the spoke unit having a single closed-loop longitudinal cross-section circumscribed to the rim and around a center of the tire, wherein each of the spokes encloses an entire circumference of the rim and contacts the rim at only two or three points.

### Claim 2 (depends on 1)

The non-pneumatic tire assembly of claim 1, wherein each spoke having the single closed-loop longitudinal cross-section of the spoke unit has only two contact points with the rim.

### Claim 3 (depends on 2)

The non-pneumatic tire assembly of claim 2, wherein seven to twenty one spokes having the single closed-loop longitudinal cross-section of the spoke unit are circularly arranged around the center of the tire.

### Claim 4 (depends on 1)

The non-pneumatic tire assembly of claim 1, wherein each spoke having the single closed-loop longitudinal cross-section of the spoke unit has only three contact points with the rim.

### Claim 5 (depends on 4)

The non-pneumatic tire assembly of claim 4, wherein four to twenty one spokes having the single closed-loop longitudinal cross-section of the spoke unit are circularly arranged around the center of the tire.

### Claim 6 (depends on 1)

The non-pneumatic tire assembly of claim 1, wherein the spokes having the single closed-loop longitudinal cross-section have an inclined axial cross-section.

### Claim 7 (depends on 1)

The non-pneumatic tire assembly of claim 1, wherein a structure reinforcing material layer is installed on the bottom of the tread.

### Claim 8 (depends on 7)

The non-pneumatic tire assembly of claim 7, wherein the structure reinforcing material layer is a set of reinforcing tubes wound one to three times around an axis.