Patent ID: 11958320
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A tire comprising:
a tread portion provided with two first circumferential grooves and two second circumferential grooves all extending in a tire circumferential direction,
one of the two first circumferential grooves and one of the two second circumferential grooves are provided on one side of a tire equator, and the other of the two first circumferential grooves and the other of the two second circumferential grooves are provided on the other side of the tire equator,
first lateral grooves connecting between the one of the two first circumferential grooves and the one of the two second circumferential grooves and second lateral grooves connecting between the other of the two first circumferential grooves and the other of the two second circumferential grooves, wherein
each of the two first circumferential grooves comprises a radially outer first portion having a groove width, and a radially inner second portion which is positioned inside the radially outer first portion in a tire radial direction and having a groove width which is wider than the groove width of the radially outer first portion, wherein
the one of the two first circumferential grooves is a zigzag groove and comprises first approximate portions at which the one of the two first circumferential grooves is closest to the one of the two second circumferential grooves, and the other of the two first circumferential grooves is a zigzag groove and comprises other first approximate portions at which the other of the two first circumferential grooves is closest to the other of the two second circumferential grooves,
a depth of each of the first approximate portions is less than a depth of the one of the two second circumferential grooves,
a depth of each of the other first approximate portions is less than a depth of the other of the two second circumferential grooves,
each of the first lateral grooves is connected to a corresponding one of the first approximate portions,
each of the second lateral grooves is connected to a corresponding one of the other first approximate portions,
a depth of each of the first lateral grooves is 70% to 90% of the depth of the first approximate portions,
a depth of each of the second lateral grooves is 70% to 90% of the depth of the other first approximate portions, wherein
the one of the two second circumferential grooves is a zigzag groove and is disposed axially outward of the one of the two first circumferential grooves,
the other of the two second circumferential grooves is a zigzag groove and is disposed axially outward of the other of the two first circumferential grooves, and
a third circumferential a zigzag groove and is disposed between the two first circumferential grooves.