JPH10234892A - Club head for golf - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a club head which reduces pressure drag applied to a head body, increases head speed at the time of swing, and stabilizes a swing trace. SOLUTION: Multiple dimples 3 are formed on a face 2a of a club head. Thus, the dimples are set to have diameter of 2-5mm and depth of 0.1-0.5mm for enhancing retaining efficiency of a compressed air layer. The recess shape of the dimple is formed into a recessed part-sphere (the recess curved surface is the back surface of a projection curved surface), or roughly a recess trancated-cone curved surface, or a cone-shaped curved surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the surface morphology of a club head to reduce aerodynamic drag caused by airflow during a swing, thereby increasing the head speed and stabilizing the swing trajectory. The present invention relates to a golf club head.

[0002]

2. Description of the Related Art Conventionally, in order to increase the flight distance of a golf ball, various attempts have been made to improve the configuration of a club head, increase the head speed even slightly, and stabilize the swing trajectory. Was. In order to increase the head speed, in addition to reducing the mass of the head body, the aerodynamic drag R represented by R = (１ ／) · C · ρ · u ² · A is reduced, that is, , The drag coefficient C, and the maximum cross-sectional area A viewed from the traveling direction of the head main body are important. ρ: density of air u: relative speed of head body

As is apparent from the above equation, in order to reduce aerodynamic drag (hereinafter referred to as pressure drag), the top surface or sole surface of the head main body can be reduced without increasing the maximum cross-sectional area of the head main body. It is effective to form the head body in a so-called streamline shape by swelling or the like so as to reduce the pressure drag. For this reason, many configurations of the invention relating to these are disclosed (for example, Japanese Patent Publication No. 7-93).
No. 956).

[0004]

However, if the top body or the sole surface of the head body is swelled without increasing the maximum cross-sectional area of the head body, the head body is necessarily formed into a streamlined shape. It is necessary to narrow the front portion of the head body including the top surface, the sole surface, and the side surfaces, and the area of the face surface, which is the leading edge, is reduced. As a result, when hitting the golf ball, there is a problem that the probability of hitting the face surface with the ball is significantly reduced.

Further, in the configuration in which the sole surface is bulged, when the club head reaches the vicinity of the lowest point at the time of swing, the bulged portion hits the ground, so that a phenomenon called so-called duffling is easily caused. There were also problems. For this reason, No. 3 for hitting a ball placed directly on the ground,
Also, it has been difficult to apply the shape in which the sole surface is bulged to the No. 4 wood club.

[0006] As described above, pursuing a head having a small pressure drag by improving the shape of the head main body tends to be accompanied by a decrease in the function in the above-described use. Accordingly, it is an object of the present invention to provide a club head that effectively reduces a pressure drag applied to a head body and increases a head speed during a swing without impairing a function in use.

[0007]

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems by improving the surface configuration of the face surface of a club head. That is, by forming a large number of dimples on the face surface, the compressed air pressure in front of the head body is reduced, and the pressure drag of the club head is reduced.

[0008] By the way, the golf ball has a dimple action, so that a golf ball has
It is known to have far superior flight distance and directional stability. The aerodynamic mechanism is considered as follows. When a golf ball flies, the airflow blowing toward the front of the ball in the direction of travel approaches the ball surface while forming a compressed air region with a pressure gradient that increases in pressure as it approaches the ball surface, and then the ball surface After moving backward along, he leaves the ball. At this time, if there are no dimples on the ball surface, the compressed air flow having increased viscosity comes into direct contact with the solid ball surface, generates a large frictional drag, and moves at a low speed on the ball surface. Become. As a result, the successively flowing air flows are stacked in front of the ball in the traveling direction, increasing the compression pressure and increasing the pressure drag. On the other hand, if dimples are formed on the ball surface, the compressed air flow has a small frictional drag between the compressed air layer held in the dimple depression and the compressed air flow flowing along the ball surface. Since the compressed air flow moves on the ball surface, the moving speed of the compressed air flow is increased, and the compressed air flow is easily removed from the ball surface. As a result, the pressure drag on the front surface of the ball is reduced, and a large flight distance is obtained.

The reduction of the pressure drag due to the dimple is as follows.
The same effect can be obtained even when the same thing as the dimple of the golf ball is formed on the face surface of the club head. In other words, on the face surface on which a large number of dimples are formed, the compressed air flow that reaches the face surface quickly moves toward the peripheral edge of the face surface with a small frictional drag with the compressed air layer held in the dimple depression. To reduce the compression pressure on the front face of the face. Further, the air flow having the reduced compression pressure hardly induces the air flow flowing along the top surface, the sole surface, and the side surface of the club head into turbulent flow, and also reduces the negative pressure behind the head. Due to this synergistic effect, the pressure drag of the club head is reduced, and the head speed during a swing can be increased.

The diameter of the dimple is set to 2 mm to 5 mm and the depth is set to 0.1 mm to 0.5 mm in order to increase the holding efficiency of the compressed air layer. Also,
The concave shape of the dimple is a concave spherical surface (hereinafter, a curved surface having a concave shape is regarded as the back surface of the convex curved surface), a substantially truncated conical curved surface, or a mortar-shaped curved surface. It is preferable that the dimples formed on the face surface are regularly arranged so that the dimples are arranged closest on the face surface.
This has the effect of increasing the coverage of the dimple surface with a small frictional drag on the face surface and further reducing the pressure drag. However, dimples may be formed on a part of the face surface in consideration of design.

On the other hand, when the relationship between the pressure drag in the traveling direction of the head main body and the lift in the vertical direction is observed at a certain constant speed of the club head, the pressure drag decreases in the club head having dimples formed on the face surface. It is understood that the lift also decreases according to the ratio. This will reduce lift, i.e., blurring.

In the conventional face, a plurality of horizontal grooves, ie, non-slip, are formed on the face for the purpose of increasing friction with the golf ball when hitting. It is not necessary to provide this groove when forming the groove. However, if it is desired to leave these grooves, it is also possible to form dimples in the regions between the respective grooves.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 shows an embodiment in which the present invention is applied to a wood club head, in which a large number of dimples 3 are formed without gaps over substantially the entire face surface 2a located at the front of a head main body 1a. Is set to 2 mm to 5 mm and the depth is set to 0.1 mm to 0.1 mm.
It is set to 5 mm. Here, the diameter of the dimple 3
And, the depths may all be the same size, or several types may be appropriately combined.

In the embodiment shown in FIG.
a, a plurality of horizontal grooves 4 are formed, and the dimples 3 are arranged between the respective grooves 4.

FIG. 3 shows an embodiment in which the present invention is applied to an iron club head.
In addition, a large number of dimples 3 are formed.

[0016]

Since the present invention is configured as described above, it has the following effects.

By forming a large number of dimples on the face surface, the pressure drag due to the air flow during the swing is reduced. Therefore, when a club having a head having the same shape is swung with the same force, the head speed is increased. be able to. As a result, the flight distance of the golf ball can be increased.

[0018] Then, the shake of the head main body is relatively weakened, the swing trajectory is stabilized, and the probability of hitting the ball in the center area of the face surface can be increased.

Further, since the configuration is such that only a large number of dimples are formed on the face surface, the present invention can be applied not only to the first wood club but also to other wood clubs and iron clubs.

Further, by adopting a structure in which a plurality of horizontal grooves are formed on the face surface and dimples are arranged and formed between the grooves, the above-described effects can be obtained while maintaining the conventional design feeling. Obtainable.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment in which dimples are formed on a face surface of a wood club head.

FIG. 2 is a perspective view showing an embodiment in which dimples and grooves are formed on the face surface of a wood club head.

FIG. 3 is a perspective view showing an embodiment in which dimples are formed on the face surface of the iron club head.

[Explanation of symbols]

 1a, 1b Head main body 2a, 2b Face surface 3 Dimple 4 groove

Claims (2)

[Claims] 1. A golf club head comprising a plurality of dimples formed on a face surface of the club head. 2. The dimple has a diameter of 2 mm to 5 mm.
2. The golf club head according to claim 1, wherein the depth is set to 0.1 mm to 0.5 mm.