Patent ID: 11865800
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 14:
15. A tire mold used for producing a tire including a tread having a tread surface to come into contact with a road surface, at least two circumferential grooves being formed on the tread, 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 projections to form the circumferential grooves and land surface-forming portions to form the land surfaces,
a surface that has a contour represented by at least one circular arc and that is tangent to the three land surface-forming portions aligned in an axial direction with the projections interposed therebetween is a reference forming surface of the tread-forming surface,
among the three land surface-forming portions, a land surface-forming portion located between the two projections is a curved land surface-forming portion,
the projections each include a reference side surface that is a side surface on the land surface-forming portion side, and a back side surface that is a side surface located on a back side of the reference side surface,
a tangent point between the curved land surface-forming portion and the reference forming surface is a reference tangent point,
a boundary between the reference side surface and the curved land surface-forming portion is a reference boundary point,
a point of intersection of the reference forming surface and a virtual line of the reference side surface that extends from the reference boundary point toward the reference forming surface is a reference virtual point of intersection,
a contour of the curved land surface-forming portion is represented by one or more circular arcs,
the reference boundary point is located inward of the reference forming surface,
under a condition that a first projection of the two projects has a first cross-sectional area, and the second projection of the two projects has a second cross-sectional area greater than the first cross-sectional area of the first projection, a first distance from the reference virtual point of intersection to the reference boundary point on the first projection side is shorter compared to a second distance from the reference virtual point of intersection to the reference boundary point on the second projection side is longer,
a virtual tread surface obtained on the assumption that the grooves are not present on the tread is a reference surface of the tread surface,
the reference forming surface of the tread-forming surface correspond to the reference surface of the tread surface, and
land surface-forming portions do not swell outward from the reference forming surface of the tread-forming surface in the radial direction.