JPH11347155A - Wood club head - Google Patents

Abstract

(57) [Summary] [Problem] To reduce the energy loss of a head body at the time of hitting a ball and to increase the flight distance of a hit ball. SOLUTION: This is a wood club head having a hollow structure made of metal and having a head volume of 200 cc or more. The thickness of the main body 1 was set to be equal to or greater than the thickness, and the specific gravity was set to be small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in the structure of a wood club head.

[0002]

2. Description of the Related Art Recently, long wood clubs having a metal hollow structure head have become mainstream. The characteristics of such a head are to reduce the head weight to make it easier to swing the club, and to increase the head volume and the moment of inertia around the center of gravity of the head to improve the flight distance and directionality of the hit ball. It is in that point.

[0003]

However, in the conventional head, in order to increase the head volume without increasing the head weight, the thickness of the head body is made as thin as possible.
The face that receives the impact of the hit ball directly is made of a material with a small specific gravity to avoid weight increase while being thickened to maintain durability,
When the ball is hit, there is a problem that energy loss due to internal stress in the thin head body increases, the repulsive force of the head applied to the ball decreases, the initial velocity decreases, and the increase in flight distance is suppressed.

In view of such circumstances, an object of the present invention is to provide a wood club head that reduces the energy loss of the head body when hitting a ball and increases the flight distance of a hit ball. is there.

[0005]

According to the present invention, there is provided a wood club head having a metal hollow structure having a head volume of 200 cc or more, wherein the rigidity of the head body excluding the face surface is reduced. The thickness of the head main body is set to be equal to or greater than the face surface and the specific gravity is set to be smaller than the face surface so that the specific gravity is equal to or more than that of the face surface.

[0006]

FIG. 1 shows, as an embodiment according to the present invention, a cross section of a wood club head having a head volume of 230 cc at the center in the longitudinal direction of the head (substantially at the center of the face surface 2).

In FIG. 1, the face surface 2 is made of a titanium alloy having a specific gravity of 4.5, and the thickness thereof is 2.9 mm over the entire face surface 2. The head body 1 is made of an aluminum alloy having a specific gravity of 2.8, and has a constant thickness of 3.5 mm throughout the entire thickness including the crown 3, the backside 4, and the sole 5. Is set.

In the golf club head according to the present invention, the thickness t ₀ of the head body is related to the thickness t of the face surface 2 by a relational expression: t ₀ ≧ t / (0.7 to 0.8) Is preferably set to at least 2 mm or more, preferably 3.5 mm or more.

It is desirable that the specific gravity (ρ _f ) of the face surface 2 and the specific gravity (ρ _h ) of the head body 1 be set so as to satisfy the relational expression of ρ _h ≦ ρ _f × 0.7.

The thickness of the face surface 2 is conventionally 3 to 3.
Although 5 mm is generally used, in the wood club head according to the present invention, the thickness of the face surface 2 is set to be smaller than this value (for example, 2 to 2.5 mm), and the weight reduced by this is reduced to the head body 1 And the thickness of the head main body 1 is increased (for example, 2.9 to 3.6 mm), so that the total weight of the head is not excessively increased.

Here, the thickness of the face surface 2 and the thickness of the head main body 1 mean the average thickness of each part of the head main body 1 within the face surface 2 or from the crown portion 3 to the side to the sole portion 5, respectively. I do.

[0012]

As described above, according to the present invention,
In a metal hollow wood club head having a head volume of 200 cc or more, since the thickness of the head body is set to be at least equal to or greater than the face surface, the rigidity (particularly bending rigidity) of the head body is relatively high. As a result, the energy loss of the head body based on the impact force when the ball is hit by the club swing is suppressed. As a result, the repulsive force of the head applied to the ball increases, the initial velocity of the ball increases, and the flight distance of the hit ball increases. Furthermore, since the specific gravity of the head body is set smaller than the specific gravity of the face surface, even if the specific surface thickness is set to be large, the weight of the entire head becomes excessively heavy, or the depth of the center of gravity of the head changes extremely. There is no.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment.

[Explanation of symbols]

 1 Head body 2 Face surface

Claims (1)

[Claims] 1. A wood club head having a metal hollow structure having a head volume of 200 cc or more, wherein the thickness of the head body is larger than that of the face surface so that the rigidity of the head body excluding the face surface is equal to or greater than that of the face surface. A wood club head characterized in that the thickness is made equal to or greater than that and the specific gravity is set small.