Pneumatic tire

Patent metadata

Field	Value
Publication number	US-2016200148-A1
Application number	US-201414912231-A
Country	US
Kind code	A1
Filing date	Aug 22, 2014
Priority date	Sep 9, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

A pneumatic tire ( 1 ) includes a tread portion ( 2 ) having at least one heat-dissipating recess portion ( 9 ). The recess portion ( 9 ) includes an opening edge ( 10 ) and an inner wall portion ( 11 ). The opening edge ( 10 ) includes a linear first edge ( 10 a ) and second edge ( 10 b ) opposite each other. The inner wall portion ( 11 ) includes a first wall surface ( 11 a ) extending from the first edge ( 10 a ) to a bottom portion ( 9 a ) at the deepest position of the recess portion ( 9 ), and a second wall surface ( 11 b ) extending from the second edge ( 10 b ) to the bottom portion ( 9 a ). An inclination angle ([theta] 1 ) of the first wall surface ( 11 a ) with respect to a first normal ( 12 a ) to a contact surface passing the first edge ( 10 a ) is greater than an inclination angle ([theta] 2 ) of a second wall surface ( 22 b ) with respect to a second normal ( 23 b ) to the contact surface passing the second edge ( 21 b ).

First claim

1 . A pneumatic tire comprising:
a tread portion provided with at lest one cooling recess portion; the recess portion comprising an opening edge opened at a ground contacting surface of the tread portion and an inner wall extending inward of the tread portion from the opening edge; the opening edge comprising a linearly extending first edge and a linearly extending second edge facing one another; the inner wall comprising, in a cross-section perpendicular to the first edge, a first wall that extends from the first edge to a deepest bottom of the recess portion and a second wall that extends from the second edge to the bottom; and an inclination angle θ 1 of the first wall with respect to a first normal line to the ground contacting surface passing the first edge being greater than an inclination angle θ 2 of the second wall with respect to a second normal line to the ground contacting surface passing the second edge.

2 . The pneumatic tire according to claim 1 , wherein the opening edge comprises a closed contour shape.

3 . The pneumatic tire according to claim 1 , wherein the inclination angle θ 2 of the second wall is in a range of from 30 to 85 degrees.

4 . The pneumatic tire according to claim 1 , wherein the first edge and the second edge extend at an angle of not more than 10 degrees with respect to an axial direction of the tire.

5 . The pneumatic tire according to claim 1 , wherein the opening edge comprises a trapezoidal shape having the second edge longer than the first edge.

6 . The pneumatic tire according to claim 1 , wherein the recess portion comprises the first wall and the second wall which are sharply connected one another at the bottom.

7 . The pneumatic tire according to claim 1 , wherein the second edge has a length in a range of from 3.0 to 10.0 mm.

8 . The pneumatic tire according to claim 1 , wherein the bottom of the recess portion has a depth in a range of from 2.0 to 8.0 mm from the ground contacting surface of the tread portion.

9 . The pneumatic tire according to claim 1 , wherein the tread portion comprises a tread pattern having a designated rotational direction, and
the second edge is located backward of the first edge in the rotational direction.

10 . The pneumatic tire according to claim 1 , wherein the tread portion comprises a tread pattern having an installing direction to a vehicle and a plurality of land portions separated by a plurality of main grooves, and
the recess portion is provided on the land portion to be located most inboard of the vehicle when the tire is installed to the vehicle.

11 . The pneumatic tire according to claim 1 , wherein the tread portion comprises a plurality of block elements separated by a plurality of lateral grooves, and
in a planar view of one of the block elements, the opening edge is arranged at a location which includes a center position of a pair of circumferentially adjacent lateral grooves.

Assignees

• Sumitomo Rubber Ind

Inventors

• Nomura Seiji

Classifications

• B60C2011/039

  provided at the shoulder portion · CPC title

• B60C2011/0381

  Blind or isolated grooves · CPC title

• B60C2011/0348

  Narrow grooves, i.e. having a width of less than 4 mm · CPC title

• B60C2011/0344

  provided at the equatorial plane · CPC title

• B60C11/032 Primary

  Patterns comprising isolated recesses · CPC title