Tyre

Patent metadata

Field	Value
Publication number	US-11420478-B2
Application number	US-201916448006-A
Country	US
Kind code	B2
Filing date	Jun 21, 2019
Priority date	Jul 19, 2018
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

A tyre includes a tread portion including a groove bottom surface and a plurality of blocks protruding from the groove bottom surface. The plurality of blocks includes one or more multi-height blocks. Each multi-height block includes a first block portion having a first height from the groove bottom surface, a second block portion having a second height from the groove bottom surface, a third block portion having a third height from the groove bottom surface, and a block groove to define the first block portion, the second block portion and the third block portion. The second height is higher than the first height, and the third height is higher than the second height.

First claim

What is claimed is:

1. A tyre comprising:
a tread portion comprising a groove bottom surface and a plurality of blocks protruding from the groove bottom surface,
the plurality of blocks comprising one or more multi-height blocks,
each multi-height block comprising a first block portion having a first height from the groove bottom surface, a second block portion having a second height from the groove bottom surface, a third block portion having a third height from the groove bottom surface, and a block groove to define the first block portion, the second block portion and the third block portion, wherein
the second height is higher than the first height,
the third height is higher than the second height,
the block groove is directly adjacent to the first, second and third block portions,
the block groove comprises a first block groove extending between the first block portion and the second block portion,
a second block groove extending between the first block portion and the third block portion, and
a third block groove extending between the second block portion and the third block portion.

2. The tyre according to claim 1 , wherein
the third block portion comprises a portion located outwardly in a tyre axial direction of the second block portion.

3. The tyre according to claim 1 , wherein
the first block portion comprises portions located on both sides in a tyre circumferential direction of the second block portion and the third block portion.

4. The tyre according to claim 1 , wherein
the first block portion comprises a portion located inwardly in a tyre axial direction of the second block portion.

5. The tyre according to claim 1 , wherein
the second block portion comprises a second outer edge located outwardly thereof in the tyre axial direction, and the second outer edge is chamfered.

6. The tyre according to claim 5 , wherein
the second block portion comprises a second top surface located outwardly thereof in a normal direction to the groove bottom surface, and
the second top surface has a pentagonal shape in which the second outer edge is dented inwardly in the tyre axial direction.

7. The tyre according to claim 1 , wherein
the third block portion comprises a third inner block sidewall located inwardly thereof in the tyre axial direction, and
the third inner block sidewall extends in a normal direction to the groove bottom surface.

8. The tyre according to claim 1 , wherein
the first block portion comprises a first outer block sidewall located outwardly thereof in the tyre axial direction,
the third block portion comprises a third outer block sidewall located outwardly in the tyre axial direction, and
the third outer block sidewall is located outwardly in the tyre axial direction of the first outer block sidewall.

9. The tyre according to claim 1 , wherein
a difference between the second height and the first height is in a range of from 4% to 10% of the first height.

10. The tyre according to claim 1 , wherein
a difference between the third height and the first height is in a range of from 8% to 12% of the first height.

11. The tyre according to claim 7 , wherein
the third block portion has a third inner edge where the third inner block sidewall and a top surface of the third block portion cross with each other, and the third inner edge protrudes inwardly in the tyre axial direction so as to form a lateral V-shape.

12. The tyre according to claim 11 , wherein
the top surface of the third block portion has a pentagonal shape.

13. The tyre according to claim 1 , wherein
the third block portion is located outwardly in a tyre axial direction of the second block portion, and
the first block portion comprises circumferentially spaced portions located on both sides in a tyre circumferential direction of the second block portion and the third block portion.

14. The tyre according to claim 11 , wherein
the third block portion is located outwardly in a tyre axial direction of the second block portion, and
the first block portion comprises circumferentially spaced portions located on both sides in a tyre circumferential direction of the second block portion and the third block portion.

15. The tyre according to claim 13 , wherein
the circumferentially spaced portions of the first block portion are connected with each other by a portion located inwardly in the tyre axial direction of the second block portion.

16. The tyre according to claim 14 , wherein
the circumferentially spaced portions of the first block portion are connected with each other by a portion located inwardly in the tyre axial direction of the second block portion.

17. A tyre comprising:
a tread portion comprising a groove bottom surface and a plurality of blocks protruding from the groove bottom surface,
the plurality of blocks comprising one or more multi-height blocks,
each multi-height block comprising a first block portion having a first height from the groove bottom surface, a second block portion having a second height from the groove bottom surface, a third block portion having a third height from the groove bottom surface, and a block groove to define the first block portion, the second block portion and the third block portion, wherein
the second height is higher than the first height,
the third height is higher than the second height,
the block groove is directly adjacent to the first, second and third block portions, and
the second block portion comprises a second outer edge located outwardly thereof in the tyre axial direction, and the second outer edge is chamfered.

18. A tyre comprising:
a tread portion comprising a groove bottom surface and a plurality of blocks protruding from the groove bottom surface,
the plurality of blocks comprising one or more multi-height blocks,
each multi-height block comprising a first block portion having a first height from the groove bottom surface, a second block portion having a second height from the groove bottom surface, a third block portion having a third height from the groove bottom surface, and a block groove to define the first block portion, the second block portion and the third block portion, wherein
the second height is higher than the first height,
the third height is higher than the second height,
the block groove is directly adjacent to the first, second and third block portions,
the third block portion is located outwardly in a tyre axial direction of the second block portion, and
the first block portion comprises circumferentially spaced portions located on both sides in a tyre circumferential direction of the second block portion and the third block portion.

Assignees

• Sumitomo Rubber Ind

Inventors

• Miwa Takuya

Classifications

• B60C11/11 Primary

  in which the raised area of the pattern consists only of isolated elements, e.g. blocks (B60C11/12, B60C11/13 take precedence) · CPC title

• B60C11/1376

  Three dimensional block surfaces departing from the enveloping tread contour · CPC title

• B60C2200/14

  for off-road use · CPC title

• B60C11/03 Primary

  Tread patterns · CPC title

• B60C2200/10

  for motorcycles, scooters or the like · CPC title