US2025295959A1PendingUtilityA1
Multi-piece solid golf ball
Est. expiryMar 25, 2044(~17.7 yrs left)· nominal 20-yr term from priority
Inventors:Hideo Watanabe
A63B 37/0006A63B 37/0084A63B 37/0031A63B 37/0087A63B 37/0018A63B 37/0068A63B 37/0096A63B 37/0075A63B 37/0033A63B 37/0021A63B 37/0063A63B 37/0076A63B 37/00921A63B 37/0089A63B 37/009
62
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Claims
Abstract
A multi-piece solid golf ball includes a core, a surrounding layer, an intermediate layer, and a cover, in which a large number of dimples are formed on an outside surface of the cover, a relationship of surface hardnesses of each sphere is specified, an initial velocity of the ball is set to 75.0 to 77.724 m/s, and a relationship of a ratio to a lift coefficient/drag coefficient at a Reynolds number of 218,000 and a spin rate of 2,800 rpm, a lift coefficient/drag coefficient at a Reynolds number of 184,000 and a spin rate of 2,900 rpm, and a lift coefficient/drag coefficient at a Reynolds number of 158,000 and a spin rate of 3,100 rpm is specified.
Claims
exact text as granted — not AI-modified1 . A multi-piece solid golf ball comprising a core, a single-layer or multiple-layer surrounding layer, a single-layer intermediate layer, and a single-layer cover, wherein a large number of dimples are formed on an outside surface of the cover, the core is formed of a rubber material, the surrounding layer, the intermediate layer, and the cover are formed of a resin material, a relationship between a surface hardness of each sphere of the ball, a surrounding layer-encased sphere, and an intermediate layer-encased sphere satisfies the following conditions (1-a) and (1-b):
(
surface
hardness
of
ball
)
>
(
surface
hardness
of
surrounding
layer
-
encased
sphere
)
(
1
-
a
)
(
surface
hardness
of
ball
)
>
(
surface
hardness
of
intermediate
layer
-
encased
sphere
)
(
1
-
b
)
where hardness means Shore C hardness,
and a relationship between the surface hardness of each sphere of the core, the surrounding layer-encased sphere, and the intermediate layer-encased sphere satisfies at least one of the following conditions (2-a) or (2-b):
(
surface
hardness
of
surrounding
layer
-
encased
sphere
)
<
(
surface
hardness
of
core
(
2
-
a
)
(
surface
hardness
of
intermediate
layer
-
encased
sphere
)
<
(
surface
hardness
of
core
)
.
(
2
-
b
)
where hardness means Shore C hardness,
when an initial velocity of the ball is from 75.0 to 77.724 m/s, a ratio CL1/CD1 of a lift coefficient CL1 at a Reynolds number of 218,000 and a spin rate of 2,800 rpm to a drag coefficient CD1 is denoted by A1, a ratio CL2/CD2 of a lift coefficient CL2 at a Reynolds number of 184,000 and a spin rate of 2,900 rpm to a drag coefficient CD2 is denoted by A2, and a ratio CL3/CD3 of a lift coefficient CL3 at a Reynolds number of 158,000 and a spin rate of 3,100 rpm to a drag coefficient CD3 is denoted by A3, the following two conditions are satisfied:
0.59
≤
A
1
≤
0
.
6
55
and
(
A
2
+
A
3
)
/
2
≥
0
.
6
70
and when a volume occupancy ratio VR of the dimples is from 0.75 to 0.89%, a total volume of the dimples is denoted by D (mm 3 ), and a deflection when the ball is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) is denoted by B (mm), the following condition is satisfied:
9
5
≤
D
/
B
≤
1
4
0
.
2 . The multi-piece solid golf ball of claim 1 , wherein a value of A1 is from 0.590 to 0.613, a value of A2 is from 0.635 to 0.668, and a value of A3 is from 0.695 to 0.734.
3 . The multi-piece solid golf ball of claim 1 , wherein a value of A1 is from 0.614 to 0.655, a value of A2 is from 0.669 to 0.750, and a value of A3 is from 0.735 to 0.815.
4 . The multi-piece solid golf ball of claim 1 , wherein a value of (A2+A3)/2 is from 0.670 to 0.783.
5 . The multi-piece solid golf ball of claim 1 , wherein the cover is formed of an ionomer resin as a chief material.
6 . The multi-piece solid golf ball of claim 1 , wherein the relationship between the surface hardness of each sphere satisfies the following condition:
(surface hardness of ball)>(surface hardness of intermediate layer-encased sphere)>(surface hardness of surrounding layer-encased sphere)<(surface hardness of core) where hardness means Shore C hardness.
7 . The multi-piece solid golf ball of claim 1 , wherein the core has a hardness profile in which, letting the Shore C hardness at a core center be Cc, the Shore C hardness at a midpoint M between the core center and a core surface be Cm, the Shore C hardnesses at positions 2 mm, 4 mm, and 6 mm inward from the midpoint M be Cm-2, Cm-4, and Cm-6 respectively, the Shore C hardnesses at positions 2 mm, 4 mm, and 6 mm outward from the midpoint M be Cm+2, Cm+4, and Cm+6 respectively, and the Shore C hardness at the core surface be Cs, and defining surface areas A to F as follows:
surface
area
A
:
1
/
2
×
2
×
(
Cm
-
4
-
Cm
-
6
)
surface
area
B
:
1
/
2
×
2
×
(
Cm
-
2
-
Cm
-
4
)
surface
area
C
:
1
/
2
×
2
×
(
Cm
-
Cm
-
2
)
surface
area
D
:
1
/
2
×
2
×
(
Cm
+
2
-
Cm
)
surface
area
E
:
1
/
2
×
2
×
(
Cm
+
4
-
Cm
+
2
)
surface
area
F
:
1
/
2
×
2
×
(
Cm
+
6
-
Cm
+
4
)
the following condition is satisfied:
{
(
surface
area
D
+
surface
area
E
)
-
(
surface
area
A
+
surface
area
B
)
}
≥
4.
.
8 . The multi-piece solid golf ball of claim 7 , wherein the core hardness profile satisfies the following condition:
(
Cs
-
Cc
)
≥
2
0
.
9 . The multi-piece solid golf ball of claim 7 , wherein the core has a hardness profile in which the following condition is satisfied:
(
Cs
-
Cc
)
/
(
Cm
-
Cc
)
≥
4
.
0
.
10 . The multi-piece solid golf ball of claim 7 , wherein the core has a hardness profile in which the following condition is satisfied:
surface area E >surface area D >surface area C.
11 . The multi-piece solid golf ball of claim 1 , wherein the core is formed of a rubber composition containing the following components (A) to (D):
(A) a base rubber, (B) an organic peroxide, (C) water or a monocarboxylic acid metal salt, and (D) sulfur.Join the waitlist — get patent alerts
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