Multi-piece golf club head
A golf club head that comprises a hollow interior cavity, a first piece, a second piece, adhesively bonded to the first piece along a first bonded joint, a third piece, adhesively bonded to the first piece along a second bonded joint, and a fourth piece, adhesively bonded to the first piece along a third bonded joint. A volume of the golf club head is at least 120 cubic centimeters (cc) and at most 600 cc. The first bonded joint has a first-joint bond area. The second bonded joint has a second-joint bond area. The third bonded joint has a third-joint bond area. A summation of the first-joint bond area, the second-joint bond area, and the third-joint bond area is at least 1,950 mm 2 and at most 3,400 mm 2 .
1 . A golf club head, comprising:
a hollow interior cavity, comprising at least a first portion, a second portion, a third portion, and a fourth portion;
a ring, comprising a first-piece interior surface that directly defines the first portion of the hollow interior cavity, wherein the ring extends from a forward portion of the golf club head and defines at least part of a heel portion, a toe portion, and a rear portion of the golf club head;
a cup, adhesively bonded to the ring along a first bonded joint and comprising a second-piece interior surface that directly defines the second portion of the hollow interior cavity, wherein the cup defines at least part of the forward portion of the golf club head;
a crown insert, adhesively bonded to one of the ring or the cup along a second bonded joint and comprising a third-piece interior surface that directly defines the third portion of the hollow interior cavity; and
a sole insert, adhesively bonded to one of the ring or the cup along a third bonded joint and comprising a fourth-piece interior surface that directly defines the fourth portion of the hollow interior cavity,
wherein:
a volume of the golf club head is at least 120 cubic centimeters (cc) and at most 600 cc;
the first bonded joint has a first-joint bond area;
the second bonded joint has a second-joint bond area;
the third bonded joint has a third-joint bond area;
a summation of the first-joint bond area, the second-joint bond area, and the third-joint bond area is at least 1,950 mm 2 and at most 3,400 mm 2 ;
the cup has a mass between 47.7 grams (g) and 109.1 g;
at least a portion of the ring is formed of an aluminum alloy;
a rearward weight attaches to the ring rearward of the first-joint bond area, the second-joint bond area, and the third-joint bond area;
the rearward weight comprises a center of gravity;
the center of gravity of the rearward weight has a z-axis coordinate of between −30 mm and 10 mm on a z-axis of a head origin coordinate system of the golf club head;
the center of gravity of the rearward weight has a y-axis coordinate of between 90 mm and 120 mm on a y-axis of a head origin coordinate system of the golf club head; and
a center of gravity of the golf club head has a y-axis coordinate of between 30 mm and 50 mm on the y-axis of the head origin coordinate system.
2 . The golf club head according to claim 1 , wherein the summation of the first-joint bond area, the second-joint bond area, and the third-joint bond area is at least 1,950 mm 2 and at most 2,900 mm 2 .
3 . The golf club head according to claim 1 , wherein the summation of the first-joint bond area, the second-joint bond area, and the third-joint bond area is at least 2,100 mm 2 and at most 3,400 mm 2 .
4 . The golf club head according to claim 3 , wherein the cup further comprises a strike face.
5 . The golf club head according to claim 1 , wherein at least an upper portion of the cup is formed of an aluminum alloy.
6 . The golf club head according to claim 1 , further comprising a strike plate, adhesively bonded to the cup along a fourth bonded joint, wherein:
the hollow interior cavity further comprises a fifth portion;
the strike plate comprises a fifth-piece interior surface that directly defines the fifth portion of the hollow interior cavity;
the fourth bonded joint has a fourth-joint bond area; and
a summation of the first-joint bond area, the second-joint bond area, the third-joint bond area, and the fourth-joint bond area is at least 4,250 mm 2 and at most 6,200 mm 2 .
7 . The golf club head according to claim 6 , wherein the summation of the first-joint bond area, the second-joint bond area, the third-joint bond area, and the fourth-joint bond area is at least 4,400 mm 2 and at most 5,500 mm 2 .
8 . The golf club head according to claim 6 , wherein the cup comprises an upper cup piece and a lower cup piece adhesively bonded to each other along a fifth bonded joint, wherein:
the fifth bonded joint has a fifth-joint bond area; and
a summation of the first-joint bond area, the second-joint bond area, the third-joint bond area, the fourth-joint bond area, and the fifth-joint bond area is at least 4,500 mm 2 and at most 7,000 mm 2 .
9 . The golf club head according to claim 8 , wherein the summation of the first-joint bond area, the second-joint bond area, the third-joint bond area, the fourth-joint bond area, and the fifth-joint bond area is at least 4,700 mm 2 and at most 6,300 mm 2 .
10 . The golf club head according to claim 1 , wherein:
the cup is made from a second-piece material;
the crown insert is made from a third-piece material;
the sole insert is made from a fourth-piece material;
the second-piece material is different than the third-piece material; and
the third-piece material and the fourth-piece material are the same.
11 . The golf club head according to claim 1 , wherein at least one of the first bonded joint, the second bonded joint, or the third bonded joint has a continuous length of at least 174 mm and at most 405 mm.
12 . The golf club head according to claim 1 , wherein:
each one of the bonded joints comprises two faying surfaces bonded together by an adhesive; and
at least one of the two faying surfaces of at least one of the bonded joints is a laser ablated surface.
13 . The golf club head according to claim 12 , wherein:
the laser ablated surface comprises an ablation pattern of peaks and valleys;
each one of the valleys of the ablation pattern has a valley major dimension and a valley minor dimension; and
at least one of the valley major dimension or the valley minor dimension of any one of the valleys of the ablation pattern is within 20% of a corresponding at least one of the valley major dimension or the valley minor dimension of all other ones of the valleys of the ablation pattern.
14 . The golf club head according to claim 1 , wherein a combined length of the first bonded joint, the second bonded joint, and the third bonded joint is at least 723 mm and at most 1,094 mm.
15 . The golf club head according to claim 1 ,
wherein
a ratio of a moment of inertia about a golf club head center of gravity x-axis (Ixx) generally parallel to the origin x-axis to a moment of inertia about a golf club head center of gravity z-axis (Izz) generally parallel to the head origin z-axis is at least 0.68, a summation of Ixx and Izz is between 850 kg-mm 2 and 1,100 kg-mm 2 , and Izz is no more than 590 kg-mm 2 .
16 . The golf club head according to claim 15 , wherein a mass of the golf club head is no more than 203 grams.
17 . The golf club head according to claim 1 , wherein the cup is made of an aluminum alloy.
18 . The golf club head according to claim 1 , wherein the cup comprises an upper cup piece and a lower cup piece.
19 . The golf club head according to claim 1 , wherein:
a total mass of the golf club head is between 185 grams (g) and 210 g; and
no more than 65% of the total mass of the golf club head is made of a material having a density between 3.6 g/cc and 5.5 g/cc.
20 . The golf club head according to claim 1 , wherein:
a total mass of the golf club head is between 185 grams (g) and 210 g; and
no less than 25% of the total mass of the golf club head is made of a material having a density between 0.9 g/cc and 3.5 g/cc.