Tyre
AssigneeSumitomo Rubber Industries, Ltd.
InventorTatsuya Kobayashi
Life of this patent
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Abstract
A tyre comprises a tread portion comprising a shoulder main groove and a shoulder land region. The shoulder land region includes an outer region, a middle region, and an inner region. The shoulder land region is provided with a plurality of shoulder sipes having components in a tyre axial direction. A sipe ratio of the middle region is smaller than the sipe ratio of the outer region and the sipe ratio of the inner region.
Claims19
A tyre comprising a tread portion wherein when the tread portion position for mounting the tyre on a vehicle is specified regarding inner and outer sides of the tread portion with respect to the vehicle, the tread portion comprises an outer shoulder main groove extending continuously in a tyre circumferential direction on a side closest to an outer tread edge with respect to the vehicle, an inner shoulder main groove extending continuously in the tyre circumferential direction on a side closest to an inner tread edge with respect to the vehicle, an outer shoulder land region formed on an outer side with respect to the vehicle and on an outer side in a tyre axial direction of the outer shoulder main groove, and an inner shoulder land region formed on an inner side with respect to the vehicle and axially outside the inner shoulder main groove, wherein
- the outer shoulder land region includes an outer region which is a region of 10% of a tread width axially outward from the outer tread edge, a middle region which is a region of 10% of the tread width axially inward from the outer tread edge, and an inner region between the middle region and the outer shoulder main groove,
- the inner shoulder land region includes an outer region which is a region of 10% of a tread width axially outward from the inner tread edge, a middle region which is a region of 10% of the tread width axially inward from the inner tread edge, and an inner region between the middle region and the inner shoulder main groove,
- each of the outer shoulder land region and the inner land region is provided with a plurality of shoulder sipes having components in the tyre axial direction,
- each of the outer regions, the middle regions, and the inner regions of the inner and the outer shoulder land regions has a sipe ratio,
- the sipe ratio is a ratio of a total opening area of the shoulder sipes to a total area of a ground contacting surface with respect to each of the outer regions, the middle regions, and the inner regions,
- the sipe ratio of the middle region is smaller than the sipe ratio of the outer region and the sipe ratio of the inner region with respect to each of the outer shoulder land region and the inner shoulder land region,
- each of the shoulder sipes arranged in the outer region of the outer shoulder land region completely crosses the outer region of the outer shoulder land region, and
- a ratio of the sipe ratio of the middle region to each of the sipe ratio of the outer region and the sipe ratio of the inner region in the inner shoulder land region is smaller than a ratio of the sipe ratio of the middle region to each of the sipe ratio of the outer region and the sipe ratio of the inner region in the outer shoulder land region.
A tyre comprising a tread portion comprising a shoulder main groove extending continuously in a tyre circumferential direction on a side closest to a tread edge and a shoulder land region formed on an outer side in a tyre axial direction of the shoulder main groove, wherein
- the shoulder land region includes an outer region which is a region of 10% of a tread width axially outward from the tread edge, a middle region which is a region of 10% of the tread width axially inward from the tread edge, and an inner region between the middle region and the shoulder main groove,
- the shoulder land region is provided with a plurality of shoulder sipes having components in the tyre axial direction,
- in each of the outer region, the middle region, and the inner region, when a ratio of a total opening area of the shoulder sipes included in the respective region to a total area of a ground contacting surface of the respective region is defined as a sipe ratio, the sipe ratio of the middle region is smaller than the sipe ratio of the outer region and the sipe ratio of the inner region,
- the shoulder land region includes a tread edge region which is a region of 10% of the tread width with the tread edge being a center thereof in the tyre axial direction, and
- the plurality of the shoulder sipes include edge sipes each having one end in the tread edge region,
- the shoulder land region includes an inner shoulder land region when the tread portion position for mounting the tyre on a vehicle is specified regarding inner and outer sides of the tread portion with respect to the vehicle,
- the edge sipes of the inner shoulder land region include a second edge sipe and a third edge sipe,
- the second edge sipe has the one end thereof arranged on the inner side in the tyre axial direction of the tread edge and extends axially inwardly therefrom, and
- the third edge sipe has the one end thereof arranged on the outer side in the tyre axial direction of the tread edge and extends axially outwardly therefrom,
- the tread portion includes an inner middle land region adjacent in the tyre axial direction to the inner shoulder land region,
- the inner middle land region is provided with an inner middle lateral groove crossing the inner middle land region,
- the inner middle lateral groove has a first apex portion protruding toward one side in the tyre circumferential direction and a second apex portion arranged on an outer side of the vehicle of the first apex portion and protruding toward the other side in the tyre circumferential direction,
- when the inner middle land region is divided into three parts equally in the tyre axial direction, the inner middle land region includes a first region positioned outermost of the vehicle and a second region adjacent to the first region,
- the first apex portion is arranged in the second region, and
- the second apex portion is arranged in the first region.
Dependencies are inferred from the claim text.