Golf club head with improved inertia performance

Abstract

A golf club head that is capable improving on the inertia properties of a golf club head all while also improving the Center of Gravity (CG) location is disclosed herein. More specifically, the golf club head in accordance with the present invention achieves a relative low Moment of Inertia (MOI) about the Z-axis (MOI-Z), a relatively low MOI about the Shaft-axis (MOI-SA), a low MOI about the Y-axis (MOI-Y) and a high MOI about the X-axis (MOI-X).

What is claimed is: 
     
         1 . A golf club head comprising:
 a frontal portion, including a striking face, forming a rearward facing face cup,   a rear portion, attached to said frontal portion, forming a rear portion of said golf club head,   wherein said golf club head has a volume of greater than about 420 cc,   wherein an x-axis is defined as a horizontal axis tangent to a geometric center of said center face portion with a positive direction towards a heel of said golf club head, a y-axis is a vertical axis orthogonal to said x-axis with a positive direction towards a crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive direction towards the frontal portion, and   wherein said golf club head has center of gravity and a moment of inertia about said x-axis through the center of gravity (MOI-X), a moment of inertia about said y-axis through the center of gravity (MOI-Y), and a moment of inertia about said z-axis through the center of gravity (MOI-Z), and   wherein said MOI-Y is less than 400 kg-mm 2  and   wherein the golf club head has a MOI-X to MOI-Y ratio of greater than about 0.7.   
     
     
         2 . The golf club head of  claim 1 , wherein said frontal portion is made out a composite type material. 
     
     
         3 . The golf club head of  claim 1 , wherein said a density of said composite type material is less than about 3.0 g/cc. 
     
     
         4 . The golf club head of  claim 3 , wherein said golf club head MOI-Y is less than 300 kg-mm 2 . 
     
     
         5 . The golf club head of  claim 4 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane that is at less than about 0.4 times a face height from the ground plane. 
     
     
         6 . The golf club head of  claim 3 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane that is at less than about 0.35 times a crown height from the ground plane. 
     
     
         7 . The golf club head of  claim 3 , wherein said MOI-X is less than 300 kg-mm 2 . 
     
     
         8 . The golf club head of  claim 7 , wherein said MOI-Y is between about 250 kg-mm 2  and 300 kg-mm 2 . 
     
     
         9 . The golf club head of  claim 3 , wherein said golf club head has a MOI-Y to MOI-Z ratio of greater than about 1.5. 
     
     
         10 . The golf club head of  claim 3 , wherein said golf club head has a MOI-X to MOI-Z ratio of greater than about 1.10. 
     
     
         11 . The golf club head of  claim 10 , wherein said golf club head has a MOI-X to MOI-Z ratio of greater than about 1.20. 
     
     
         12 . The golf club head of  claim 3 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-Y, that is at less than about 0.4 times a face height from the ground plane. 
     
     
         13 . The golf club head of  claim 12 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-Y, that is at less than about 0.35 times a crown height from the ground plane. 
     
     
         14 . A golf club head comprising:
 a frontal portion, including a striking face, forming a rearward facing face cup,   a rear portion, attached to said frontal portion, forming a rear portion of said golf club head,   wherein said golf club head has a volume of greater than about 420 cc,   wherein an x-axis is defined as a horizontal axis tangent to a geometric center of said center face portion with a positive direction towards a heel of said golf club head, a y-axis is a vertical axis orthogonal to said x-axis with a positive direction towards a crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive direction towards the frontal portion, and   wherein said golf club head has center of gravity and a moment of inertia about said x-axis through the center of gravity (MOI-X), a moment of inertia about said y-axis through the center of gravity (MOI-Y), and a moment of inertia about said z-axis through the center of gravity (MOI-Z), and   wherein said MOI-Y is less than 400 kg-mm 2  and   wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-Y, that is at less than about 0.4 times a face height from the ground plane.   
     
     
         15 . The golf club head of  claim 14 , wherein said MOI-Y is between about 250 kg-mm 2  and 300 kg-mm 2 . 
     
     
         16 . The golf club head of  claim 14 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-Y, that is at less than about 0.4 times a face height from the ground plane. 
     
     
         17 . The golf club head of  claim 16 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-Y, that is at less than about 0.35 times a crown height from the ground plane. 
     
     
         18 . The golf club head of  claim 14 , wherein said frontal portion is made out a composite type material. 
     
     
         19 . The golf club head of  claim 14 , wherein said a density of said first material is less than about 3.0 g/cc. 
     
     
         20 . The golf club head of  claim 19 , wherein said golf club head has a MOI-Y to MOI-Z ratio of greater than about 1.5.