JP2926695B2 - Golf club head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood golf club head.

[0002]

2. Description of the Related Art Wood-based golf club heads are made of various materials such as persimmon, synthetic resin, metal, and alloy, and are required to have a long flight distance. In order for a golfer, such as a professional or an advanced player, who does not have a high head speed to fly the ball far, it is important to increase the launch speed (ball initial speed) and launch angle of the ball. For golfers who have difficulty hitting the ball at the sweet spot, a head that can reduce the decrease in flight distance even if the ball is hit without the sweet spot is desired. For example, a golfer with a slow head speed is shown in FIG.
As shown in (1), when the ball is hit above the center of the face 1 (position A), since the face 1 is rounded, the launch angle of the ball is high and the decrease in the flight distance is small. However, when the ball is hit below the center of the face 1 (position C), the launch angle is reduced due to the influence of the round. Further, when the ball is hit on a line passing through the center of gravity G and orthogonal to the face 1 (position B), since the center of gravity of the head and the ball is on the same line, the maximum energy is given to the ball. The probability of being able to make an impact at the position B is extremely low for a typical golfer.

In order to increase the sweet spot, a golf club head having a large head volume made of a synthetic resin material or various metals (including alloys) has been developed. For example, in the case of a head made of titanium or aluminum or an alloy thereof having a small specific gravity, the head volume can be increased without increasing the head weight, and the weight can be dispersed around the head, that is, the peripheral weight can be distributed. In addition, attempts have been made to make the sweet spot wider by making the position of the center of gravity backward and increasing the depth of the center of gravity.

[0004] Wood-based golf club head, as shown in FIG. 4, the head body 2 and a face 1 and the sole 3, the distance from the face center 1A to the center of gravity G is the centroid depth Z _G, and the The height from the horizontal line passing through the sole 3 to the center of gravity G when the sole 3 is solely taken is the center of gravity height Hg.
r, the angle between the surface orthogonal to the horizontal plane contacting the sole 3 when the sole 3 is solely inserted and the surface of the face 1 passing through the face center 1A is the loft angle θ. The conventional head has a center of gravity height Hgr of 21 to 23 mm and a center of gravity depth Zg of about 20 to 30 mm.

[0005]

The depth of the center of gravity Zg is 20 to
When the distance is about 30 mm, the moment of inertia around the X axis passing through the center of gravity G of the head shown in FIG. 5 is small, the initial velocity of the ball is reduced due to the variation of the hit points in the vertical direction of the face 1, and the height Hgr of the center of gravity is about 21 to 23 mm. , The position of the sweet spot on the face 1 is high, and when the ball is hit below the face center 1A, the ball does not rise and the flight distance decreases.

Accordingly, the present invention suppresses a decrease in the flight distance by raising the ball even if the ball is hit under the face center, and can increase the ball initial speed and the launch angle even for a general golfer having different hit positions. It is an object of the present invention to provide a wood-based golf club head.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a head having a head weight of 175 to 220 g, a head volume of 200 cc or more, a loft angle of 5 to 16 ° ,
The main body is made of metal or alloy material or synthetic resin material
Is a wood-based golf club head formed from these combinations , and the head book is formed along the outer rear edge of the sole.
Attaching a member having a large specific gravity M ₂ than the specific gravity M ₁ of the body portion
In addition, the depth Zg of the center of gravity of the head is set to 35 mm or more, and the height Hgr of the center of gravity of the head is set to 20 mm or less. In addition,
The head volume is preferably 320 cc or less.

[0008]

The head according to the present invention is such that even a golfer having a relatively low power can shake off the head, and even a golfer having a head volume of 200 cc or more and having a low meat ratio is likely to hit somewhere on the face. Since the depth Zg is 35 mm or more, the range of the sweet spot is widened, the ball is easily lifted, and the gear effect is also easily worked. If the depth of the center of gravity Zg is made ever deeper, the moment of inertia of the head around the X axis (see FIG. 5) becomes larger. Therefore, even if the sweet spot is removed up and down and the ball is hit, the decrease in the initial ball speed is reduced. Further, since the height Hgr of the center of gravity is 20 mm or less, the ball rises even when the ball is hit below the face center. Specific gravity M of the head body along the outer rear edge of the sole
Since mounting a member having a large specific gravity M ₂ than _1, above
Deepening the center of gravity and easily lowering the height of the center of gravity
Can be.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, the face 1, the sole 3 and the upper 4 constituting the head main body 2 are made of the same material.
For example, it is preferably formed of a metal material having a small specific gravity, such as a magnesium alloy, an aluminum alloy, and a titanium alloy. A member 5 having a specific gravity larger than the specific gravity of the head main body 2 is attached along the outer rear edge of the sole 3. This member 5 is preferably a titanium alloy,
It is made of stainless steel, copper alloy, iron and other materials. The specific gravity of the material forming the head main body 2 and _{M 1,} if the specific gravity of the material forming the member 5 and the _{M 2, M 1} is 1.75
Is preferably about 2.8, _{M 2} is preferably about 4 to 16. Specific gravity _{M 2} - gravity _{M 1} is 1.5 to 10, preferably from 1.5 to 8. The head body 2 includes a side 6 and a hosel 7. The head body 2 without the hosel 7 may be used.

FIG. 2 shows the head viewed from the sole 3 side.
The attachment position of the member 5 is shown by cross hatching.

The head thus configured has a head weight of 175 to 220 g, a head volume of 200 cc or more, and a loft angle θ of 5 to 16 °. The head center of gravity depth Zg is 35 mm or more, and the head center of gravity height Hgr is 20 mm.
mm or less.

Next, Table 1 compares Examples 1 and 2 of the present invention with a conventional golf club head.

[0014]

[Table 1]

In Table 1, Hg is the height up to the face center 1A. Ix indicates the moment of inertia about the X axis. In the first embodiment, a head as shown in FIGS. 1 and 2 is formed, the head main body 2 is formed of a magnesium alloy, and the member 5 is formed of stainless steel. In Example 2, a head as shown in FIGS. 1 and 2 was formed, the head main body 2 was formed of an aluminum alloy, and the member 5 was formed of a copper alloy. The conventional example is formed entirely of a stainless steel material.

The following Table 2 shows back spin, launch angle, ball initial velocity, carry when the hit point is set at the face center 1A and when the hit point is removed from above and below the face center 1A in Examples 1, 2 and the conventional example shown in Table 1. , The total distance. The case where there is a dot above the face center 1A is indicated by +, and the case where there is a dot below the face center 1A is indicated by-, and the unit is mm. D _YG indicates the distance from the face center to the center of gravity position Hg.

[0017]

[Table 2]

As is apparent from Table 2, the launch angles and ball initial velocities of the first and second embodiments are higher than those of the conventional example even when the hit point is lower than the face center 1A. I understand. In Table 2, an experiment was performed using a test hitting robot at a head speed of 35 m / sec.

In the embodiment, the head main body 2 is formed of a metal or alloy material. However, a head using a synthetic resin material, a so-called carbon head, or a combination of carbon and metal, or a face 1 may be used. The composite head may be made of a material different from that of the other head body 2. Further, the material of the sole 3 can be made of a material having a high specific gravity, and a low center of gravity can be achieved.

[0020]

As described above, according to the present invention, the specific gravity M of the head main body along the outer rear edge of the sole.
Attaching a member having a large specific gravity M ₂ than _1, the centroid depth Zg of the head and above 35 mm, height of center of gravity of the head Hgr
Is set to 20 mm or less, the range of the sweet spot is widened, the ball is easily lifted, and the gear effect is easily worked. When the depth of the center of gravity Zg is increased, the moment of inertia of the head around the X axis increases, and even if the sweet spot is removed vertically, the decrease in the initial velocity of the ball is suppressed, and the flight distance is extended. Center of gravity height Hgr is 20
When the distance is equal to or less than mm, even when the ball is hit below the face center, the ball is easily lifted, and a decrease in the flight distance is suppressed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a view of the embodiment shown in FIG. 1 as seen from the sole side.

FIG. 3 is an explanatory diagram in a case where hit points of a ball are different from each other.

FIG. 4 is a diagram illustrating the depth of the center of gravity and the height of the center of gravity.

FIG. 5 is a front view showing an X axis passing through the center of gravity.

[Explanation of symbols]

 Reference Signs List 1 face 2 head body 3 sole 4 upper 5 member 6 side 7 hosel

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-6-182004 (JP, A) JP-A-63-154186 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A63B 53/04 A63B 53/06

Claims (2)

(57) [Claims] 1. A head weight of 175 to 220 g, a head body
Product 200cc or more, Loft angle 5-16 °And head book
Body is metal or alloy material or synthetic resin material or
Formed from these combinationsWood Golf Club
AndSpecific gravity M of the head body along the outer rear edge of the sole ₁ Yo
Large specific gravity M _Two Attach a member having  The center of gravity Zg of the head is set to 35 mm or more, and the center of gravity Hgr of the head is set to 20 mm or less.
And golf club head. 2. A golf club head, wherein a relationship between a specific gravity M _1, M ₂ of claim 1 is _{(M 2 -M 1)> 1.5} .