US 2026/0241237 A1Published application

Multi-piece solid golf ball

AssigneeBridgestone Sports Co., Ltd.

InventorHideo WATANABE

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Abstract

In a golf ball including a core, an intermediate layer, and a cover, letting Shore C hardnesses at a core surface, an 87.5% outer position, a 50% outer position, and a 12.5% outer position of a core radius from a core center be H100, H87.5, H50, and H12.5 respectively, and a Shore C hardness at the core center be H0, the following conditions are satisfied: ( H 87.5 - H ⁢ 50 ) / ( H ⁢ 50 - H 12.5 ) ≥ 3.5 ⁢ deflection ⁢ of ⁢ core ⁢ ( CT ) > ( H ⁢ 100 - H ⁢ 50 ) / ( H ⁢ 50 - H ⁢ 0 ) ⁢ ( hardness ⁢ of ⁢ intermediate ⁢ layer ⁢ material - hardness ⁢ of ⁢ cover ⁢ ⁢ material ) - ( surface ⁢ hardness ⁢ of ⁢ intermediate ⁢ layer - encased ⁢ sphere - ( H 62.5 ) ≥ - 2 (where the material hardnesses and the surface hardness indicate Shore C values), and further, the dimples have a volume occupancy ratio (VR) of from 0.75 to 0.89%.

A multi-piece solid golf ball comprising a core, an intermediate layer, and a cover, wherein a plurality of dimples are formed on an outside surface of the cover, and in a hardness profile of the core, letting a Shore C hardness at a surface of the core be H100, the Shore C hardness at a position outside by 87.5% of a core radius from a core center be H87.5, the Shore C hardness at a position outside by 75% of the core radius from the core center be H75, the Shore C hardness at a position outside by 62.5% of the core radius from the core center be H62.5, the Shore C hardness at a position outside by 50% of the core radius from the core center be H50, the Shore C hardness at a position outside by 37.5% of the core radius from the core center be H37.5, the Shore C hardness at a position outside by 25% of the core radius from the core center be H25, the Shore C hardness at a position outside by 12.5% of the core radius from the core center be H12.5, and the Shore C hardness at the core center be H0, the following condition is satisfied:

(
H
87.5
-
H
⁢
50
)
/
(
H
⁢
50
-
H
12.5
)
≥
3.5
and letting a deflection when the core is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) be CT (mm), the following condition is satisfied:
CT
>
(
H
⁢
100
-
H
⁢
50
)
/
(
H
⁢
50
-
H
⁢
0
)
,
a relationship between the Shore C hardness (H62.5) at the position outside by 62.5% of the core radius from the core center, a material hardness of the intermediate layer and the cover, and a surface hardness of a layer-encased sphere in which the core is encased with the intermediate layer satisfies the following condition:
(
intermediate
⁢
layer
⁢
material
⁢
hardness
-
cover
⁢
material
⁢
hardness
)
-
(
surface
⁢
hardness
⁢
of
⁢
intermediate
⁢
layer
-
encased
⁢
sphere
-
H
62.5
)
≥
-
2
(where the material hardnesses and the surface hardness indicate Shore C hardness values),
and the dimples have a volume occupancy ratio (VR) of 0.75 to 0.89%.

79 more elements

Abstract

Claims11