Motorcycle tire

Patent metadata

Field	Value
Publication number	US-2016159153-A1
Application number	US-201414903109-A
Country	US
Kind code	A1
Filing date	Jun 23, 2014
Priority date	Jul 29, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

A motorcycle tire includes, on an outer circumferential side of a crown region of a radial carcass, a belt layer, a single auxiliary belt layer, and a tread rubber in the stated order, a periphery width of the auxiliary belt layer being greater than a periphery width of the belt layer. The cords of the auxiliary belt layer extend in a direction in which an inclination angle of the cords of the auxiliary belt layer with respect to a tire circumferential direction gradually decreases from each of both ends of a tire equatorial region including a tire equatorial plane toward a corresponding ¼ position which is at a distance of ¼ of the periphery width of the auxiliary belt layer from the tire equatorial plane along a periphery of the auxiliary belt layer, and the inclination angle in the ¼ position is 60° or more and 85° or less.

First claim

1 . A motorcycle tire that includes, as a frame, a carcass made up of one or more radial carcass plies toroidally extending between a pair of bead portions, and includes, on an outer circumferential side of a crown region of the carcass, a belt layer made up of a plurality of rubber-coated cords, a single auxiliary belt layer made up of a plurality of rubber-coated cords, and a tread rubber in the stated order, a periphery width of the auxiliary belt layer being greater than a periphery width of the belt layer,
wherein the cords of the auxiliary belt layer extend in a direction in which an inclination angle of the cords of the auxiliary belt layer with respect to a tire circumferential direction gradually decreases from each of both ends of a tire equatorial region including a tire equatorial plane toward a corresponding ¼ position which is at a distance of ¼ of the periphery width of the auxiliary belt layer from the tire equatorial plane along a periphery of the auxiliary belt layer, and the inclination angle in the ¼ position is 60° or more and 85° or less, and the inclination angle of the cords of the auxiliary belt layer in an end of the auxiliary belt layer is 70° or more and 85° or less.

2 . (canceled)

3 . (canceled)

4 . A motorcycle tire that includes, as a frame, a carcass made up of one or more radial carcass plies toroidally extending between a pair of bead portions, and includes, on an outer circumferential side of a crown region of the carcass, a belt layer made up of a plurality of rubber-coated cords, a single auxiliary belt layer made up of a plurality of rubber-coated cords, and a tread rubber in the stated order, a periphery width of the auxiliary belt layer being greater than a periphery width of the belt layer,
wherein the cords of the auxiliary belt layer extend in a direction in which an inclination angle of the cords of the auxiliary belt layer with respect to a tire circumferential direction gradually decreases from each of both ends of a tire equatorial region including a tire equatorial plane toward a corresponding ¼ position which is at a distance of ¼ of the periphery width of the auxiliary belt layer from the tire equatorial plane along a periphery of the auxiliary belt layer, and the inclination angle in the ¼ position is 60° or more and 85° or less, and the cords of the auxiliary belt layer have an inflection point in the ¼ position or outward from the ¼ position in a tire width direction, and extend in a direction in which the inclination angle gradually increases from the inflection point toward an end of the auxiliary belt layer.

5 . The motorcycle tire according to claim 4 ,
wherein the inclination angle of the cords of the auxiliary belt layer in the end of the auxiliary belt layer is 70° or more and 90° or less.

Assignees

• Bridgestone Corp

Inventors

• Oshima Masatomo

Classifications

• B60C9/02

  Carcasses · CPC title

• B60C2200/10

  for motorcycles, scooters or the like · CPC title

• B60C9/20 Primary

  built-up from rubberised plies each having all cords arranged substantially parallel · CPC title

• B60C9/28 Primary

  characterised by the belt or breaker dimensions or curvature relative to carcass (B60C9/30 takes precedence) · CPC title

• B60C11/00

  Tyre tread bands; Tread patterns; Anti-skid inserts · CPC title