Patent ID: 11897291
Assignee: THE YOKOHAMA RUBBER CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A pneumatic tire, comprising:
a tread portion extending in a tire circumferential direction, having an annular shape, and having a tread pattern, wherein
the tread pattern comprising:
two inner main grooves being positioned on both sides in a tire lateral direction with respect to a tire equator line of the pneumatic tire and being formed in an entire circumference in the tire circumferential direction;
two outer main grooves being provided and sandwiching the two inner main grooves on an inner side in the tire lateral direction;
an inner continuous land portion being sandwiched between the two inner main grooves and being continuously formed in the entire circumference in the tire circumferential direction;
two intermediate continuous land portions being sandwiched between one of the two inner main grooves and one of the two outer main grooves and between the other one of the two inner main grooves and the other one of the two outer main grooves, respectively, the two intermediate continuous land portions being continuously formed in the entire circumference in the tire circumferential direction, the two intermediate continuous land portions being outward in the tire lateral direction of the inner continuous land portion; and
first sipes being provided in regions of the two intermediate continuous land portions and extending inward in the tire lateral direction from the two outer main grooves,
regions of the inner continuous land portion and the two intermediate continuous land portions being not provided with lug grooves extending from the two inner main grooves or the two outer main grooves,
edges on both sides of one of the two inner main grooves each comprising a groove chamfered portion having a chamfered width changing in the tire circumferential direction and forming a zigzag shape as seen from a tread surface of the tread portion, and
the first sipes each including:
a sipe main body portion having a constant distance between sipe wall surfaces on a sipe bottom side in a depth direction of the first sipes; and
a sipe chamfered portion inclined so that the sipe wall surfaces are open to the tread surface on a side of the tread surface of the first sipes,
the sipe chamfered portion including, along an extending direction of the first sipe, a symmetric shape portion where two facing sipe wall surfaces of the sipe chamfered portion are arranged being symmetric with respect to a sipe center line of the first sipe, and an asymmetric shape portion where the two facing sipe wall surfaces are arranged being asymmetric with respect to the sipe center line, and
in the asymmetric shape portion, one of the two facing sipe wall surfaces having a gradual inclined surface that inclines with respect to the tread surface gradually compared to an other of the two facing sipe wall surfaces.