Tire

Patent metadata

Field	Value
Publication number	US-10023012-B2
Application number	US-201515102999-A
Country	US
Kind code	B2
Filing date	Jan 8, 2015
Priority date	Jan 15, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A tire includes primary inclined grooves and auxiliary inclined grooves. Each primary inclined groove has a first gently inclined portion and a first steeply inclined portion. Each auxiliary inclined groove has a second gently inclined portion and a second steeply inclined portion. Each primary inclined groove does not communicate with a circumferential groove on the tire equator line side and extends beyond a tread edge outward in a tire width direction. Each auxiliary inclined groove does not communicate with the circumferential groove on the tire equator line side, and does not reach the tread edge but terminates on the tire equator line side.

First claim

The invention claimed is:

1. A tire comprising, in a tread plan view:
a pair of circumferential grooves formed respectively on opposite sides of a tire equator line and extending in a tire circumferential direction; and
a plurality of lug grooves formed on an outer side of at least one circumferential groove of the pair of circumferential grooves in a tire width direction, wherein
the plurality of lug grooves include primary inclined grooves and auxiliary inclined grooves alternately formed in the tire circumferential direction,
each of the primary inclined grooves does not communicate with the circumferential groove on the tire equator line side and extends beyond a tread edge outward in the tire width direction,
each primary inclined groove includes: a first gently inclined portion located on the tire equator line side; and a first steeply inclined portion located on the tread edge side and continuing to the first gently inclined portion,
an inclination angle of the first steeply inclined portion relative to the tire circumferential direction is larger than an inclination angle of the first gently inclined portion relative to the tire circumferential direction,
each of the auxiliary inclined grooves does not communicate with the circumferential groove on the tire equator line side, and does not reach the tread edge but terminates on the tire equator line side,
each auxiliary inclined groove includes: a second steeply inclined portion located on the tire equator line side; and a second gently inclined portion located on the tread edge side relative to the second steeply inclined portion,
an inclination angle of the second steeply inclined portion relative to the tire circumferential direction is larger than an inclination angle of the second gently inclined portion relative to the tire circumferential direction, wherein
each primary inclined groove includes: a first contacting groove wall provided on a side that comes into contact with a ground first in a tire rotation direction; and a later contacting groove wall provided on a side that comes into contact with the ground later in the tire rotation direction, and
an inclination of the later contacting groove wall relative to the tire radial direction is larger than an inclination of the first contacting groove wall relative to the tire radial direction.

2. The tire according to claim 1 , wherein
each primary inclined groove has an inner end located on an innermost side in the tire width direction, and
in the tire width direction, a distance between the inner end and the one circumferential groove is 2.5% or more and 8.0% or less of a contact width which is a distance of the tread edge.

3. The tire according to claim 1 , wherein
between the pair of circumferential grooves, no widthwise groove extending in the tire width direction is formed, and a plurality of hole portions located at predetermined intervals in the tire circumferential direction are formed.

4. The tire according to claim 1 , wherein
a groove width of the primary inclined groove located on the tire equator line side is larger than a groove width of the primary inclined groove located on the tread edge side.

Assignees

• Bridgestone Corp

Inventors

• Hayashi Shintaro

Classifications

• B60C2011/0388

  provided at the equatorial plane · CPC title

• B60C2011/0365

  characterised by width · CPC title

• B60C2011/0372

  with particular inclination angles · CPC title

• B60C11/0302 Primary

  directional pattern, i.e. with main rolling direction · CPC title

• B60C2011/0334

  Stiffness · CPC title