JP2004147757A - Wood-type golf club head and wood-type golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood-type golf club head whose head volume is at least 300 ml, capable of achieving a high and stable trajectory, and a wood-type golf club with the head. <P>SOLUTION: The wood-type golf club has the wood-type golf club head 1, a shaft, and a grip. The volume of the wood-type golf club head 1 is at least 300ml, and the vertical moment of inertia is at least 1800gcm<SP>2</SP>. The golf club head comprises a face part 2, a side part 3, a crown part 4 and a sole part 5. The effective loft angle is at least 14 degrees and not more than 18 degrees. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood-type golf club head and a wood-type golf club, and in particular, by increasing the effective loft angle and volume of the head and increasing the length of the club, even a golfer with a low head speed can move the ball farther. The present invention relates to a wood type golf club head capable of skipping the golf ball and a wood type golf club equipped with the head.
[0002]
[Prior art]
The flight distance is an important factor for golf clubs. In particular, a wood type golf club is required to improve the flight distance, and various proposals for improving the flight distance have been made.
[0003]
For example, in Japanese Patent Application Laid-Open No. 08-24376, even if a ball is hit under the face center, the ball is raised to suppress a decrease in flight distance, and even a general golfer with different hitting positions can increase the initial ball speed and launch angle. In order to provide a wood-based golf club head that can be used, it is a wood-based golf club head having a head weight of 175 to 220 g, a head volume of 200 ml or more, and a loft angle of 5 to 16 degrees, and the center of gravity depth Zg of the head is 35 mm or more. A golf club head in which the center of gravity height Hgr of the head is 20 mm or less is disclosed.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 08-24376
[Problems to be solved by the invention]
In the golf club head described in the above-mentioned Japanese Patent Application Laid-Open No. 08-24376, there is a device for increasing the flight distance even when the hit point is below the sweet spot, but the conventional head having a relatively small head volume is targeted. . The hit point position of a general golfer is larger in the lateral blur width than in the vertical direction.
[0006]
Therefore, in order to secure a meet rate, which is the probability that a ball can be hit at a legal position, it is necessary to increase the dimensions in the toe-heel direction while the head volume is small. In this case, the inertia moment in the left-right direction of the head increases, but the inertia moment in the vertical direction does not increase, and the influence on the backspin amount of the golf ball is negligible.
[0007]
However, when the head volume exceeds 300 ml, the dimensions are enlarged in the vertical direction in order to balance the head shape, and the vertical moment of inertia of the head increases.
[0008]
The vertical moment of inertia is an index representing the ease of rotation when the head is rotated in the sole-crown (vertical) direction. When the hitting position deviates up and down from the sweet spot, a force to rotate the head in the up and down direction is applied. At this time, the larger the vertical moment of inertia of the head, the more difficult it is to rotate, and backspin is less likely to be applied. This vertical moment of inertia is obtained by measuring the rotation period of the head while hanging so that the contact surface at the center of the face is vertical.
[0009]
FIG. 4 shows the relationship between the head volume, the longitudinal moment of inertia, and the backspin amount. As shown in FIG. 4, is less than 300ml for example head volume from 150 ml, longitudinal moment of inertia, has increased substantially linearly from 1000Gcm ² to the 1700Gcm ^2, increases rapidly in the above 300ml, the 2000Gcm ² Some things have also appeared.
[0010]
For this reason, when the head volume is less than 300 ml, the decrease in the backspin is gradual and is at least about 2000 rpm, but at 300 ml or more, the backspin is less than 2000 rpm, and some with about 1000 rpm also appear.
[0011]
In order to stabilize the trajectory of the golf ball, a backspin of about 1800 to 2400 rpm is required at least. When the speed is lowered to 1000 rpm, the trajectory becomes unstable, the flight distance is reduced due to insufficient lift, and the influence of crosswind is affected. It becomes easier to receive, and the direction of the hit ball is greatly deviated.
[0012]
The present invention has been made to solve such problems. An object of the present invention is to provide a wood-type golf club head capable of realizing a high and stable trajectory in a wood-type golf club head having a head volume of 300 ml or more, and a wood-type golf club having the head. There is.
[0013]
[Means for Solving the Problems]
The wood type golf club head according to the present invention has a volume of 300 ml or more, a longitudinal moment of inertia of 1800 gcm ² or more, and an effective loft angle of 14 degrees or more and 18 degrees or less.
[0014]
The upper limit of the head volume is considered to be about 460 ml in consideration of the head material at the time of filing of the present application, but the present invention can be applied to a head having a volume larger than 460 ml. Further, the upper limit value of the longitudinal moment of inertia is considered to be about 3000 gcm ^{2 in} consideration of the technical level at the time of filing of the present application, but the present invention can be applied to a head larger than 3000 gcm ² .
[0015]
By the way, the wood-type golf club is previously deflected with respect to the target direction so that the orientation of the face at the time of hitting matches the target direction. This deviation is called a face angle. The effective loft angle is a value obtained by subtracting from 90 degrees the angle formed by the tangent at the center of the face with the horizontal plane (ground) when this deviation is eliminated (when the face angle is 0 degree).
[0016]
A wood type golf club according to the present invention comprises a wood type golf club head having a club length of 111.76 cm (44 inches) or more, a volume of 300 ml or more, and a longitudinal moment of inertia of 1800 gcm ² or more. The effective loft angle of the type golf club head is 14 degrees or more and 16 degrees or less. The upper limit of the club length is considered to be about 119.38 cm (47 inches) in consideration of the fact that a general golfer can actually swing properly.
[0017]
By setting the effective loft angle to 14 degrees or more and 18 degrees or less in the head having the volume and the moment of inertia as described above, the backspin amount can be increased while increasing the ball jumping angle.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a wood type golf club head and a wood type golf club according to an embodiment of the present invention will be described.
[0019]
The wood type golf club of the present embodiment has a length of about 111.76 cm (44 inches) or more and 119.38 cm (47 inches) or less, and includes a wood type golf club head, a shaft, and a grip described later. Known shafts and grips are used.
[0020]
The wood type golf club head of the present embodiment is typically made of metal and has a face portion, a crown portion, a side portion, and a sole portion. The head volume is about 300 ml to 460 ml. The head moment of inertia is about 1800 gcm ² or more and 3000 gcm ² or less.
[0021]
A head having a volume of 300 ml or more such as the head of the present embodiment is large, so the sweet spot position is high, especially for a golfer whose head speed is 40 m / s or less, or a golfer who drives a downblow. , The backspin is too little to hit the ball easily.
[0022]
Therefore, some people use golf clubs called fairway woods with a large loft angle, such as No. 3 wood (called spoons), for tee shots. When this fairway wood is used, the hitting ball is likely to rise higher, but the club speed is shorter than No. 1 wood (called a driver), which further reduces the head speed. Moreover, since the fairway wood has a small moment of inertia of about 1300 gcm ² , even if the size is simply increased, there is a problem that the backspin is applied too much and the flight distance is reduced. Therefore, a satisfactory flight distance cannot be obtained.
[0023]
Therefore, in the wood type golf club head of the present embodiment, the effective loft angle, which is the inclination angle of the face surface, is increased to about 14 degrees or more and 18 degrees or less. Preferably, the effective loft angle is 15 degrees or more and 16 degrees or less.
[0024]
Thus, by setting the effective loft angle to 14 degrees or more and 18 degrees or less in a head having a head volume of 300 ml or more and a longitudinal moment of inertia of 1800 gcm ² or more, the ball jump angle can be increased.
[0025]
Further, from the tendency shown in FIG. 5, the backspin amount can be increased by increasing the loft angle. Therefore, the backspin amount can be increased by setting the effective loft angle within the above range.
[0026]
Furthermore, by setting the length of the golf club to 111.76 cm (44 inches) or more, the head speed can be secured and the initial velocity of the hit ball can be increased. As a result, the trajectory of the golf ball can be increased and stabilized, and a satisfactory flight distance can be obtained.
[0027]
The backspin amount in FIG. 5 is a head speed of 350 ml, a head moment of 2000 gcm ² , an effective loft angle of 10.5 degrees, 13 degrees, 15 degrees, and 20 degrees. The measurement was performed by swinging at 40 m / s and a blow angle of 0 degree. The club size was 111.76 cm (44 inches) and the shaft flex was S.
[0028]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0029]
FIG. 1 shows a wood type golf club head 1 according to one embodiment of the present invention. The wood-type golf club in this embodiment is a so-called driver (No. 1 wood) having a length of 44 inches, and includes the golf club head 1 shown in FIG. 1, a shaft, and a grip. Since well-known shafts and grips can be used, their illustration and description are omitted.
[0030]
As shown in FIG. 1, the wood type golf club head 1 in the present embodiment is made of metal and includes a face portion 2, a side portion 3, a crown portion 4, and a sole portion 5.
[0031]
In the wood type golf club head 1 in this example, the effective loft angle θ of the face surface is 15 degrees, the head volume is 350 ml, the inertia moment in the toe-heel direction is 3500 gcm ² , the longitudinal inertia moment is 1800 gcm ² , and the center of gravity depth is 28 mm. The sweet spot height is 34 mm, the score line width is 0.6 mm, and the score line depth is 0.2 mm.
[0032]
Next, the inventor of the present application made a trial hit to confirm the effect of the present invention, and the result will be described with reference to FIGS.
[0033]
FIG. 2 shows the results of actual test hits by subjects 1 to 6, and FIG. 3 shows the results of the robot test. The test was performed using a head having a head volume of 350 ml, a longitudinal moment of inertia of 2000 gcm ² , and an effective loft angle of 10.5 degrees, 14 degrees, 16 degrees, and 20 degrees.
[0034]
As shown in FIG. 2 and FIG. 3, the carry, which is the distance until the golf ball first falls to the ground after hitting, increases as a whole when the effective loft angle is in the range of 14 degrees to 18 degrees. I understand. In particular, it can be seen from FIG.
[0035]
Although the embodiments and examples of the present invention have been described above, the embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. . The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.
[0036]
【The invention's effect】
According to the present invention, in a large head having a head volume of 300 ml or more and a longitudinal inertia moment of 1800 gcm ² or more, the effective loft angle is set to 14 degrees or more and 18 degrees or less, thereby increasing the ball jumping angle. The backspin amount can also be increased, and the trajectory of the golf ball can be increased and stabilized. Thereby, even a beginner or an elderly person can improve the flight distance of the ball relatively easily.
[Brief description of the drawings]
FIG. 1 is a side view of a wood-type golf club head according to one embodiment of the present invention.
FIG. 2 is a diagram showing a test hit result by a subject performed using wood type golf club heads having different loft angles.
FIG. 3 is a diagram showing a test hit result by a robot performed using wood type golf club heads having different loft angles.
FIG. 4 is a diagram illustrating a relationship among a moment of inertia, a head volume, and a backspin amount.
FIG. 5 is a graph showing the relationship between the backspin amount and the loft angle.
[Explanation of symbols]
1 golf club head, 2 face part, 3 side part, 4 crown part, 5 sole part.

Claims (2)

In a wood type golf club head having a volume of 300 ml or more and a longitudinal moment of inertia of 1800 gcm ² or more,
A wood-type golf club head having an effective loft angle of 14 degrees or more and 18 degrees or less. The club is 111.76 cm long,
A wood type golf club head having a volume of 300 ml or more and a longitudinal moment of inertia of 1800 gcm ² or more;
The wood type golf club, wherein an effective loft angle of the wood type golf club head is 14 degrees or more and 16 degrees or less.

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