US 2026/0284478 A1Published application

Golf ball

AssigneeSumitomo Rubber Industries, Ltd.

InventorsKaita FUKAO, Takahiro SAJIMA, Kosuke TACHIBANA

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Abstract

In a golf ball 2, values V1 and V2 are each −3.0 or more and 3.0 or less, a difference (V3−V4) between values V3 and V4 is 5.0 or more and 10.0 or less, a value V5 is 65.0 or more and 73.0 or less, and a value Z is −25.0 or more and less than 0.0. V ⁢ 1 = ( H ⁢ 5 - H ⁢ 0 ) - ( H ⁢ 15 - H ⁢ 10 ) V ⁢ 2 = ( H ⁢ 10 - H ⁢ 5 ) - ( Hs - H ⁢ 15 ) V ⁢ 3 = ( ( H ⁢ 5 - H ⁢ 0 ) + ( H ⁢ 15 - H ⁢ 10 ) ) / 2 V ⁢ 4 = ( ( H ⁢ 10 - H ⁢ 5 ) + ( H ⁢ s - H ⁢ 1 ⁢ 5 ) ) / 2 V ⁢ 5 = ( H ⁢ 5 + H ⁢ 1 ⁢ 0 + H ⁢ 1 ⁢ 5 ) / 3 Z = - 5 36.36 * Db + 146.46 * Lb - 238.52 * Da + 225.22 * La + 111.21 Db: drag coefficient under a first condition Lb: lift coefficient under the first condition Da: drag coefficient under a second condition La: lift coefficient under the second condition

Claims20

Dependent claims

A golf ball comprising a spherical core and a cover, wherein

a value V1 calculated by the following mathematical formula (1) is −3.0 or more and 3.0 or less,
a value V2 calculated by the following mathematical formula (2) is −3.0 or more and 3.0 or less,
a difference (V3−V4) between a value V3 calculated by the following mathematical formula (3) and a value V4 calculated by the following mathematical formula (4) is 5.0 or more and 10.0 or less,
a value V5 calculated by the following mathematical formula (5) is 65.0 or more and 73.0 or less,
the golf ball has a plurality of dimples on a surface thereof,
a ratio X of a total area of all the dimples to a surface area of a phantom sphere of the golf ball is 70% or more, and
a value Z calculated by the following mathematical formula (6) is −25.0 or more and less than 0.0,
V
⁢
1
=
(
H
⁢
5
-
H
⁢
0
)
-
(
H
⁢
15
-
H
⁢
10
)
,
(
1
)
V
⁢
2
=
(
H
⁢
10
-
H
⁢
5
)
-
(
Hs
-
H
⁢
15
)
,
(
2
)
V
⁢
3
=
(
(
H
⁢
5
-
H
⁢
0
)
+
(
H
⁢
15
-
H
⁢
10
)
)
/
2
,
(
3
)
V
⁢
4
=
(
(
H
⁢
10
-
H
⁢
5
)
+
(
H
⁢
s
-
H
⁢
1
⁢
5
)
)
/
2
,
(
4
)
V
⁢
5
=
(
H
⁢
5
+
H
⁢
1
⁢
0
+
H
⁢
1
⁢
5
)
/
3
,
(
5
)
Z
=
-
5
36.36
*
Db
+
146.46
*
Lb
-
238.52
*
Da
+
225.22
*
La
+
111.21
,
(
6
)
in the mathematical formulas (1) to (5), H0, H5, H10, and H15 respectively represent hardnesses (Shore C) of the core at points whose distances from a central point of the core are 0 mm, 5 mm, 10 mm, and 15 mm, and Hs represents a surface hardness (Shore C) of the core, and
in the mathematical formula (6), Db represents a drag coefficient under a condition where a Reynolds number is 1.20*105 and a ratio (rω/V) is 0.131, Lb represents a lift coefficient under a condition where the Reynolds number is 1.20*105 and the ratio (rω/V) is 0.131, Da represents a drag coefficient under a condition where the Reynolds number is 0.83*105 and the ratio (rω/V) is 0.179, La represents a lift coefficient under a condition where the Reynolds number is 0.83*105 and the ratio (rω/V) is 0.179, and the ratio (rω/V) is calculated by dividing a product of a radius r (m) and a backspin rate ω (rad/s) of the golf ball by a speed V (m/s) of the golf ball.

174 more elements

A golf ball comprising a spherical core and a cover, wherein

the core has a diameter of 38.0 mm or more and 41.5 mm or less,
a value V1 calculated by the following mathematical formula (1) is −2.0 or more and 2.0 or less,
a value V2 calculated by the following mathematical formula (2) is −2.0 or more and 2.0 or less,
a difference (V3−V4) between a value V3 calculated by the following mathematical formula (3) and a value V4 calculated by the following mathematical formula (4) is 5.5 or more and 9.0 or less,
a value V5 calculated by the following mathematical formula (5) is 67.0 or more and 73.0 or less,
a hardness H0 is 58 or more and 66 or less,
a difference (Hs−H0) is 18.0 or more and 26.0 or less,
the golf ball has a plurality of dimples on a surface thereof,
a ratio X of a total area of all the dimples to a surface area of a phantom sphere of the golf ball is 75% or more and 95% or less,
a total volume Y of all the dimples is 390 mm3 or more and 500 mm3 or less,
a value T calculated by the following mathematical formula (7) is 0.00 or more and 10.0 or less,
a value Z calculated by the following mathematical formula (6) is −15.0 or more and −0.5 or less, and
an amount of compressive deformation CDb of the golf ball is 2.80 mm or more and 3.10 mm or less,
V
⁢
1
=
(
H
⁢
5
-
H
⁢
0
)
-
(
H
⁢
15
-
H
⁢
10
)
,
(
1
)
V
⁢
2
=
(
H
⁢
10
-
H
⁢
5
)
-
(
Hs
-
H
⁢
15
)
,
(
2
)
V
⁢
3
=
(
(
H
⁢
5
-
H
⁢
0
)
+
(
H
⁢
15
-
H
⁢
10
)
)
/
2
,
(
3
)
V
⁢
4
=
(
(
H
⁢
10
-
H
⁢
5
)
+
(
H
⁢
s
-
H
⁢
1
⁢
5
)
)
/
2
,
(
4
)
V
⁢
5
=
(
H
⁢
5
+
H
⁢
1
⁢
0
+
H
⁢
1
⁢
5
)
/
3
,
(
5
)
Z
=
-
5
36.36
*
Db
+
146.46
*
Lb
-
238.52
*
Da
+
225.22
*
La
+
111.21
,
(
6
)
T
=
-
0.55
*
X
+
0.115
*
Y
+
0.3
,
(
7
)
in the mathematical formulas (1) to (5), H0, H5, H10, and H15 respectively represent hardnesses (Shore C) of the core at points whose distances from a central point of the core are 0 mm, 5 mm, 10 mm, and 15 mm, and Hs represents a surface hardness (Shore C) of the core, and
in the mathematical formula (6), Db represents a drag coefficient under a condition where a Reynolds number is 1.20×105 and a ratio (rw/V) is 0.131, Lb represents a lift coefficient under a condition where the Reynolds number is 1.20×105 and the ratio (rw/V) is 0.131, Da represents a drag coefficient under a condition where the Reynolds number is 0.83×105 and the ratio (rw/V) is 0.179, La represents a lift coefficient under a condition where the Reynolds number is 0.83×105 and the ratio (rw/V) is 0.179, and the ratio (rw/V) is calculated by dividing a product of a radius r (m) and a backspin rate w (rad/s) of the golf ball by a speed V (m/s) of the golf ball.

196 more elements

Dependencies are inferred from the claim text.