Patent ID: 11884034
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A tire mold to produce a tire including a tread having a tread surface that comes into contact with a road surface, at least two circumferential grooves having a groove width of not less than 9 mm being formed on the tread so as to extend in a circumferential direction, thereby forming at least three land portions in the tread, the tread surface including the at least two circumferential grooves and at least three land surfaces that are outer surfaces of the at least three land portions, the tire mold comprising:
a tread-forming surface to shape the tread surface, wherein
the tread-forming surface includes at least two projections to respectively form the at least two circumferential grooves, and at least three land surface-forming portions to respectively form the at least three land surfaces,
a contour of a land surface-forming portion between two projections among the at least three land surface-forming portions is represented by a single, continuous circular arc that is convex outward in a radial direction,
of the two projections, a first projection is a wide projection having a larger width than a second projection, and the second projection is a narrow projection having a smaller width than the first projection,
a surface that is tangent to the at least three land surface-forming portions is defined as a reference surface of the tread-forming surface, and
a wide-side drop distance, which is a first distance, in the radial direction, from the reference surface of the tread-forming surface to a first end of the contour of the land surface-forming portion between the two projections on a wide projection side, is greater than a narrow-side drop distance, which is a second distance, in the radial direction, from the reference surface of the tread-forming surface to a second end of the contour of the land surface-forming portion between the two projections on a narrow projection side.