# US 2021/0276370 A1 · Pneumatic tire

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- Number: US 2021/0276370 A1
- Document ID: US20210276370A1
- Status: Published application
- Kind: A1
- Application number: 17/257,155
- Filed: 2019-02-14
- Published: 2021-09-09
- Earliest claimed: 2018-07-03
- Assignees: The Yokohama Rubber Co., Ltd.
- Applicants: The Yokohama Rubber Co., LTD.
- Inventors: Haruna MIZUSHIMA
- Web page: https://patentgrep.com/patent/US20210276370A1

## CPC

- B60C 11/1392: {with chamfered block edges}
- B60C 11/0306: {Patterns comprising block rows or discontinuous ribs}
- B60C 11/032: {Patterns comprising isolated recesses}
- B60C 11/12: characterised by the use of narrow slits or incisions, e.g. sipes
- B60C 11/1236: {with special arrangements in the tread pattern}
- B60C 11/0304: {Asymmetric patterns}
- B60C 2011/0341: {Circumferential grooves}
- B60C 2011/0362: {Shallow grooves, i.e. having a depth of less than 50% of other grooves}
- B60C 2011/0381: {Blind or isolated grooves}
- B60C 2011/0383: {at the centre of the tread}
- B60C 2011/0386: {Continuous ribs}
- B60C 2011/0388: {provided at the equatorial plane}
- B60C 2011/039: {provided at the shoulder portion}
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

In a pneumatic tire, a land portion includes a chamfered portion formed on an edge portion of the land portion on a ground contact edge side, and a lug groove and a narrow groove disposed correspondingly to the chamfered portion. The chamfered portion is formed on the edge portion on a ground contact edge side, and has a chamfered width that increases toward a circumferential direction in the road contact surface of the land portion. The lug groove terminates in the land portion on one end, and is opened to a central portion of the chamfered portion in a longitudinal direction on the other end. The narrow groove is opened to an edge portion of the land portion on an equatorial plane side on one end, and terminates in the vicinity of a maximum width position of the chamfered portion on the other end.

## Claims

### Claim 1

A pneumatic tire, comprising:
a plurality of circumferential main grooves extending in a tire circumferential direction; and
a land portion defined by the plurality of circumferential main grooves adjacent to each other,
the land portion comprising:
a chamfered portion formed on an edge portion of the land portion on a tire ground contact edge side; and
a lug groove and a narrow groove disposed correspondingly to the chamfered portion,
the chamfered portion having a chamfered width that increases toward the tire circumferential direction on a road contact surface of the land portion,
the lug groove terminating in the land portion on one end, and being opened to a central portion of the chamfered portion in a longitudinal direction on an other end, and
the narrow groove being opened to an edge portion of the land portion on a tire equatorial plane side on one end, and terminating in a vicinity of a maximum width position of the chamfered portion or being connected to the maximum width position on an other end.

### Claim 2 (depends on 1)

The pneumatic tire according to claim 1, wherein a maximum width We of the chamfered portion has a relationship of 0.05≤Wc/Wb2≤0.30 with respect to a maximum width Wb2 of the land portion.

### Claim 3 (depends on 1)

The pneumatic tire according to claim 1, wherein a maximum length Lc from the maximum width position to a minimum width position of the chamfered portion in the tire circumferential direction has a relationship of 0.60≤Lc/Pc≤1.00 with respect to a pitch length Pc of the chamfered portion.

### Claim 4 (depends on 1)

The pneumatic tire according to claim 1, wherein the chamfered portion has a triangular shape obtained by connecting a long portion and a short portion to each other on the road contact surface of the land portion.

### Claim 5 (depends on 1)

The pneumatic tire according to claim 1, wherein an extension length D22 of the lug groove in a tire width direction has a relationship of 0.20≤D22/Wb2≤0.80 with respect to a maximum width Wb2 of the land portion.

### Claim 6 (depends on 1)

The pneumatic tire according to claim 1, wherein a maximum groove width W22 of the lug groove has a relationship of 0.03≤W22/Lc≤0.10 with respect to the maximum length Lc from the maximum width position to the minimum width position of the chamfered portion in the tire circumferential direction.

### Claim 7 (depends on 1)

The pneumatic tire according to claim 1, wherein an inclination angle θ22 of the lug groove with respect to the tire circumferential direction is in a range of 30 deg≤θ22≤85 deg.

### Claim 8 (depends on 1)

The pneumatic tire according to claim 1, wherein a distance L22 from the maximum width position of the chamfered portion to an opening position of the lug groove with respect to the chamfered portion in the tire circumferential direction has a relationship of 0.35≤L22/Lc≤0.65 with respect to the maximum length Lc from the maximum width position to the minimum width position of the chamfered portion in the tire circumferential direction.

### Claim 9 (depends on 1)

The pneumatic tire according to claim 1, wherein an inclination angle θ23 of the narrow groove with respect to the tire circumferential direction is in a range of 30 deg≤θ23≤85 deg.

### Claim 10 (depends on 1)

The pneumatic tire according to claim 1, wherein a maximum groove width W23 of the narrow groove has a relationship of 0≤W23/W22≤0.80 with respect to the maximum groove width W22 of the lug groove.

### Claim 11 (depends on 1)

The pneumatic tire according to claim 1, wherein the maximum groove width W22 of the lug groove is in a range of 2.5 mm≤W22≤6.5 mm.

### Claim 12 (depends on 1)

The pneumatic tire according to claim 1, wherein the maximum groove width W23 of the narrow groove is in a range of 0.4 mm≤W23≤1.5 mm.

### Claim 13 (depends on 1)

The pneumatic tire according to claim 1, wherein a distance Gs between the other end of the narrow groove and the maximum width position of the chamfered portion is in a range of Gs≤1.0 mm.

### Claim 14 (depends on 13)

The pneumatic tire according to claim 13, wherein the other end of the narrow groove is disposed separated from the maximum width position of the chamfered portion.

### Claim 15 (depends on 1)

The pneumatic tire according to claim 1, wherein only the narrow groove is opened to the edge portion of the land portion on the tire equatorial plane side, and other wide lateral grooves are not opened to the edge portion.