Motorcycle tire for traveling on rough terrain

Patent metadata

Field	Value
Publication number	US-2016236516-A1
Application number	US-201415025141-A
Country	US
Kind code	A1
Filing date	Oct 2, 2014
Priority date	Oct 16, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

Provided is a motorcycle tire ( 1 ) for traveling on rough terrain, the tire having a block ( 10 ) provided to a tread section ( 2 ). The block ( 10 ) has the following: a block lateral surface body part ( 15 ) that extends straight from the edge of a tread surface ( 12 ) inward in the tire radial direction; and a skirt section ( 20 ) that connects the block lateral surface body part ( 15 ) and a groove bottom surface ( 9 ). The skirt section ( 20 ) has the following: a flat section ( 21 ) that extends in a straight line on the groove bottom surface ( 9 ) side; and a curved section ( 22 ) that connects, in a beveled arc, the area between the flat section ( 21 ) and the block lateral surface body part.

First claim

1 . A motorcycle tire for running on rough terrain comprising:
a tread portion provided with a plurality of blocks protruding from a virtual block bottom which extends along a groove bottom; in a block cross section passing a center of gravity of a ground contact surface of the blocks and being perpendicular to the virtual block bottom, the blocks comprising a block-sidewall main portion extending radially inwardly in a straight shape from an edge of the ground contact surface and a skirt portion that connects the block-sidewall main portion to the groove bottom; and the skirt portion comprising a planar portion extending in a straight shape on the side of the groove bottom and a curved portion so as to connect the block-sidewall main portion to the planar portion in a chamfered manner.

2 . The pneumatic tire according to claim 1 , wherein a skirt length (L 1 ) measured along the virtual groove bottom from an intersection (P 1 ) between the virtual block bottom and a virtual extension of the block-sidewall main portion to an intersection (P 2 ) between the groove bottom and the skirt portion is in a range of from 0.19 to 1.00 times a block height (Hb) from the virtual block bottom to the ground contact surface.

3 . The motorcycle tire for running on rough terrain according to claim 1 , wherein a skirt height (Hs) from the virtual block bottom to an intersection (P 3 ) between a virtual extension of the planar portion and a virtual extension of the block-sidewall main portion is in a range of from 0.02 to 0.13 times a block height (Hb) from the virtual block bottom to the ground contact surface.

4 . The motorcycle tire for running on rough terrain according to claim 1 , wherein a length of the planar portion along the virtual block bottom is greater than a length of the curved portion along the virtual block bottom.

5 . The motorcycle tire for running on rough terrain according to claim 1 , wherein the planar portion is inclined at an angle of from 5 to 15 degrees with respect to the virtual block bottom.

6 . The motorcycle tire for running on rough terrain according to claim 1 , wherein the planar portion has an angle of less than 5 degrees with respect to the virtual block bottom.

Assignees

• Sumitomo Rubber Ind

Inventors

• Sueishi Makoto

Classifications

• B29D30/0601

  Vulcanising tyres; Vulcanising presses for tyres · CPC title

• B60C2200/14

  for off-road use · CPC title

• B60C2200/10

  for motorcycles, scooters or the like · CPC title

• B60C11/13

  characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping · CPC title

• B60C11/11

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