Motorcycle tire with tread having main blocks and lower height sub blocks
AssigneeBridgestone Corporation
InventorIchizou Nakamura
Life of this patent
Estimating the term…
Abstract
A motorcycle tire is provided that is capable of remarkably improving a traction characteristic and an anti-sideslip characteristic for cornering without deteriorating the mud expulsion characteristic especially on a dirt road. In embodiments, a motorcycle tire has a plurality of main blocks scattered on a tread. Sub blocks are provided between the main blocks. The sub blocks are made of rubber and have a block height H2 lower than that the height H1 of the main blocks. A part of the rubber constituting a top portion of the sub block is removed to reduce the area of a upper face of the sub block.
Claims15
A motorcycle tire, comprising:
- a plurality of main blocks scattered on a tread;
- and
- sub blocks provided on a centerline of the tire between the main blocks in a tire circumferential direction, each sub block being made of rubber and having a block height lower than that of the main blocks, each sub block comprising:
- a top portion extending downward from an upper face of the sub block to a bending portion of a sidewall of the sub block;
- and
- a bottom portion extending downward from the bending portion to a groove surface,
- wherein an area of the upper face of the sub block is less than a cross sectional area of the sub block at a height of the bottom portion, and
- the bending portion extends around a perimeter of the sub block.
A motorcycle tire, comprising:
- a plurality of main blocks scattered on a tread;
- and
- sub blocks provided on a centerline of the tire between the main blocks in a tire circumferential direction, each sub block being made of rubber and having a block height lower than that of the main blocks, each sub block comprising a bending portion that extends around a perimeter of the sub block at a mid point of a side wall extending from a groove bottom toward an upper face of the sub block,
- wherein, an upper face area of the sub block is smaller than a cross sectional area of the sub block at a height of the bending portion.
A motorcycle tire, comprising:
- a plurality of main blocks scattered on a tread;
- and
- sub blocks provided on a centerline of the tire between the main blocks in a tire circumferential direction, each sub block being made of rubber and having a block height lower than that of the main blocks, each sub block comprising:
- a bottom portion extending radially upward from the tread and having a side that maintains substantially a constant angle with respect to the radial direction;
- and
- a top portion extending radially upward from the bottom portion to an upper face of the sub block,
- wherein a cross sectional area of the upper face of the sub block is less than a cross sectional area of the sub block at a radially uppermost portion of the bottom portion based on at least a change in the angle of the side of the sub block radially upward from the bottom portion, the change in the angle of the side of the sub block extends around a perimeter of the sub block.
Dependencies are inferred from the claim text.