JP2011194266A - Golf club head - Google Patents

Golf club head Download PDF

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JP2011194266A
JP2011194266A JP2011130581A JP2011130581A JP2011194266A JP 2011194266 A JP2011194266 A JP 2011194266A JP 2011130581 A JP2011130581 A JP 2011130581A JP 2011130581 A JP2011130581 A JP 2011130581A JP 2011194266 A JP2011194266 A JP 2011194266A
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viscoelastic
club head
viscoelastic body
golf club
face plate
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JP5021825B2 (en
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Hideo Matsunaga
英夫 松永
Ko Saka
航 坂
Hideo Shimazaki
秀夫 島崎
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Bridgestone Sports Co Ltd
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Bridgestone Sports Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To reduce vibrations of a wide range of frequencies when reducing vibration of the golf club head by mounting a viscoelastic body on it.SOLUTION: The golf club head is mounted with a first viscoelastic body comprising a first viscoelastic material and a second viscoelastic body comprising a second viscoelastic material having temperature dependency of a loss factor different from that of the first viscoelastic material. The golf club head includes a club head body and a face plate attached to the front side of the club head body. The club head body has a hollow part opening in the face plate side and closing in the back part side of the head body. The first and second viscoelastic bodies are loaded in a compressed state into a space formed by the hollow part and the face plate. The hollow part is contracted toward the back part side from the face plate side. The second viscoelastic body is arranged at the back part side of the first viscoelastic body and is smaller than the first viscoelastic body.

Description

本発明はゴルフクラブヘッドに関し、特に、粘弾性体の装着によるゴルフクラブヘッドの制振技術に関する。   The present invention relates to a golf club head, and more particularly to a vibration control technique for a golf club head by mounting a viscoelastic body.

インパクト時の打感の向上や打音の調整のため、粘弾性体を取り付けたゴルフクラブヘッドが提案されている。粘弾性体を取り付けることでインパクト時の振動が粘弾性体により吸収され、打感が向上されると共にプレイヤーに耳障りとなる打音を低減することができる。特許文献１には比重と弾性が異なる複数種類の弾性錘を装着したゴルフクラブヘッドが開示されている。また、特許文献２には硬度が異なる複数種類の弾性体を装着したゴルフクラブヘッドが開示されている。   In order to improve the hit feeling at impact and adjust the hitting sound, a golf club head to which a viscoelastic body is attached has been proposed. By attaching the viscoelastic body, vibration at the time of impact is absorbed by the viscoelastic body, and the hitting sound can be improved and the hitting sound that is annoying to the player can be reduced. Patent Document 1 discloses a golf club head equipped with a plurality of types of elastic weights having different specific gravity and elasticity. Patent Document 2 discloses a golf club head equipped with a plurality of types of elastic bodies having different hardnesses.

実用新案登録第３１１２０３８号公報Utility Model Registration No. 3112038 特開２００４−３１３７７７号公報JP 2004-313777 A

ここで、本発明の発明者がゴルフクラブヘッド単体での共振周波数について検証したところ、概ね４０００Ｈｚ〜１００００Ｈｚの範囲の複数の周波数において共振周波数が確認された。従って、ゴルフクラブヘッドの振動をより効果的に低減するためには、広範な周波数の範囲について振動を低減できる粘弾性体をゴルフクラブヘッドに装着することが望ましい。しかし、一般に粘弾性材料が振動低減に効果的な周波数の範囲にはその材料に応じて限界がある。また、本発明の発明者がゴルフクラブ全体での共振周波数について検証したところ、概ね２０００Ｈｚ以下の範囲の複数の周波数において共振周波数が確認された。従って、ゴルフクラブ全体としてその振動を低減しようとする場合には更に広範な周波数の範囲について振動を低減する必要がある。   Here, when the inventors of the present invention verified the resonance frequency of the golf club head alone, the resonance frequency was confirmed at a plurality of frequencies in a range of approximately 4000 Hz to 10000 Hz. Accordingly, in order to more effectively reduce the vibration of the golf club head, it is desirable to attach a viscoelastic body capable of reducing the vibration over a wide frequency range to the golf club head. However, in general, there is a limit in the frequency range in which a viscoelastic material is effective in reducing vibration depending on the material. Moreover, when the inventor of the present invention verified the resonance frequency of the entire golf club, the resonance frequency was confirmed at a plurality of frequencies in a range of approximately 2000 Hz or less. Therefore, in order to reduce the vibration of the golf club as a whole, it is necessary to reduce the vibration over a wider frequency range.

従って、本発明の目的は、粘弾性体の装着によりゴルフクラブヘッドの振動を低減するにあたり、より広範囲な周波数の振動を低減することにある。   Accordingly, an object of the present invention is to reduce vibrations in a wider range of frequencies when reducing the vibration of a golf club head by mounting a viscoelastic body.

本発明によれば、第１の粘弾性材料からなる第１粘弾性体と、前記第１の粘弾性材料とは損失係数の温度依存性が異なる第２の粘弾性材料からなる第２粘弾性体と、が装着されたゴルフクラブヘッドにおいて、ヘッド本体と、前記ヘッド本体の正面側に取り付けられる前記フェースプレートと、を備え、前記ヘッド本体は、前記フェースプレート側に開口し、前記ヘッド本体のバック部側で閉じた空洞部を有し、前記第１及び第２粘弾性体が、前記空洞部と前記フェースプレートとにより形成される空間内に圧縮状態で装填され、前記空洞部は、前記フェースプレート側から前記バック部側に向かって縮小し、前記第２粘弾性体は、前記第１粘弾性体の背部側に配設され、前記第１粘弾性体よりも小さいことを特徴とするゴルフクラブヘッドが提供される。 According to the present invention, the first viscoelastic body made of the first viscoelastic material and the second viscoelasticity made of the second viscoelastic material having a temperature coefficient of loss coefficient different from those of the first viscoelastic material. A golf club head to which a body is mounted , the head body, and the face plate attached to the front side of the head body, the head body opening to the face plate side, A cavity portion closed on a back portion side, and the first and second viscoelastic bodies are loaded in a compressed state in a space formed by the cavity portion and the face plate, and the cavity portion is The second viscoelastic body is reduced from the face plate side toward the back portion side, and the second viscoelastic body is disposed on the back side of the first viscoelastic body and is smaller than the first viscoelastic body. Golf club head It is provided.

粘弾性材料の損失係数（ｔａｎδ）の温度依存性は、各温度に対するその粘弾性材料の振動減衰効果の程度を示すものであるが、各周波数に対するその粘弾性材料の振動減衰効果の程度に関係する。つまり、相対的に、低温度において損失係数が高い粘弾性材料は高周波数帯に対する振動減衰効果が高い一方、高温度において損失係数が高い粘弾性材料は低周波数帯に対する振動減衰効果が高い。   The temperature dependence of the loss factor (tan δ) of a viscoelastic material indicates the degree of vibration damping effect of the viscoelastic material for each temperature, but is related to the degree of vibration damping effect of the viscoelastic material for each frequency. To do. That is, a viscoelastic material having a relatively high loss coefficient at a low temperature has a high vibration damping effect for a high frequency band, whereas a viscoelastic material having a high loss coefficient at a high temperature has a high vibration damping effect for a low frequency band.

従って、損失係数の温度依存性が異なる複数種類の粘弾性材料を併用することで、より広範囲な周波数の振動を低減することができる。   Therefore, vibrations in a wider range of frequencies can be reduced by using a plurality of types of viscoelastic materials having different temperature dependences of loss factors.

以上述べた通り、本発明によれば、粘弾性体の装着によりゴルフクラブヘッドの振動を低減するにあたり、より広範囲な周波数の振動を低減することができる。   As described above, according to the present invention, when the vibration of the golf club head is reduced by mounting the viscoelastic body, it is possible to reduce the vibration of a wider range of frequencies.

本発明の一実施形態に係るゴルフクラブヘッドＡの分解斜視図である。1 is an exploded perspective view of a golf club head A according to an embodiment of the present invention. （Ａ）はゴルフクラブヘッドＡが分解状態での図１の線Ｘ−Ｘに沿う断面図、（Ｂ）はゴルフクラブヘッドＡを組み立てた状態での図１の線Ｘ−Ｘに沿う断面図である。1A is a sectional view taken along line XX in FIG. 1 when the golf club head A is disassembled, and FIG. 1B is a sectional view taken along line XX in FIG. 1 when the golf club head A is assembled. It is. 図２（Ａ）の線Ｙ−Ｙに沿う断面図である。It is sectional drawing which follows the line YY of FIG. 2 (A). （Ａ）乃至（Ｅ）はゴルフクラブヘッドＡに装填される粘弾性体の例を示す図である。(A) thru | or (E) are figures which show the example of the viscoelastic body with which the golf club head A is loaded. （Ａ）は比較実験に用いた各粘弾性材料の損失係数の温度依存性を示す図、（Ｂ）は実施例及び比較例１乃至３の各ゴルフクラブヘッドに対する振動計測実験の結果を示す図である。(A) is a figure which shows the temperature dependence of the loss coefficient of each viscoelastic material used for the comparison experiment, (B) is a figure which shows the result of the vibration measurement experiment with respect to each golf club head of an Example and Comparative Examples 1-3. It is.

図１は本発明の一実施形態に係るゴルフクラブヘッドＡの分解斜視図、図２（Ａ）はゴルフクラブヘッドＡが分解状態での図１の線Ｘ−Ｘに沿う断面図、図２（ｂ）はゴルフクラブヘッドＡを組み立てた状態での図１の線Ｘ−Ｘに沿う断面図、図３は図２（Ａ）の線Ｙ−Ｙに沿う断面図である。   1 is an exploded perspective view of a golf club head A according to an embodiment of the present invention, FIG. 2A is a cross-sectional view taken along line XX of FIG. 1 in an exploded state, and FIG. FIG. 3B is a sectional view taken along line XX in FIG. 1 in a state where the golf club head A is assembled, and FIG. 3 is a sectional view taken along line YY in FIG.

ゴルフクラブヘッドＡはアイアン型のゴルフクラブヘッドであり、ヘッド本体１０と、ヘッド本体１０の正面側に取り付けられ、フェース面２０ａを構成するフェースプレート２０とを備える。本実施形態ではアイアン型のゴルフクラブヘッドを例示するが、他の形式のゴルフクラブヘッドに対しても本発明は適用可能である。   The golf club head A is an iron-type golf club head, and includes a head main body 10 and a face plate 20 that is attached to the front side of the head main body 10 and forms a face surface 20a. In this embodiment, an iron-type golf club head is exemplified, but the present invention is applicable to other types of golf club heads.

ヘッド本体１０はシャフトに連結されるホゼル部１０ａと、ソール部１０ｂと、バック部１０ｃと、が一体に形成されており、例えば、ステンレス鋼や軟鉄から構成される。ヘッド本体１０の上部はその正面側から背面側に貫通する開口部１０ｄが形成され、ヘッド本体１０の軽量化及び低重心化が図られている。また、ヘッド本体１０の正面にはフェースプレート２０の装着空間を画定するリブ１０ｅが形成されていると共にフェースプレート２０の背面が当接する当接部１０ｆが形成されている。   The head body 10 is integrally formed with a hosel portion 10a coupled to a shaft, a sole portion 10b, and a back portion 10c, and is made of, for example, stainless steel or soft iron. An opening 10d penetrating from the front side to the back side is formed in the upper part of the head main body 10 to reduce the weight and lower the center of gravity of the head main body 10. Further, a rib 10e for defining a mounting space for the face plate 20 is formed on the front surface of the head body 10, and an abutting portion 10f with which the back surface of the face plate 20 abuts is formed.

フェースプレート２０は、その正面にフェース面２０ａが、その周縁に段部２０ｂが形成されており、その背面は平坦な面をなしている。フェースプレート２０は例えばステンレス鋼、マルエージング鋼、真鍮、銅合金（例えば、ベリリウム銅、青銅）、チタン、チタン合金、ジュラルミン、アモルファス金属、ＦＲＭ等から構成される。   The face plate 20 is formed with a face surface 20a on the front surface and a stepped portion 20b on the periphery thereof, and the back surface is a flat surface. The face plate 20 is made of, for example, stainless steel, maraging steel, brass, copper alloy (for example, beryllium copper, bronze), titanium, titanium alloy, duralumin, amorphous metal, FRM, or the like.

ヘッド本体１０にはフェースプレート２０側に開口し、バック部１０ｃ側で閉じた空洞部１１が形成されている。空洞部１１はヘッド本体１０に一体的に形成された周壁１２乃至１４により画定されている。周壁１２乃至１４のフェースプレート２０側の端面のうち、空洞部１１の上部の周壁１２の端面は当接部１０ｆと面一でフェースプレート２０の背面に当接する当接部１２ａと、当接部１２ａの内側においてフェースプレート２０の背面から離間する離間部１２ｂと、を有する。また、空洞部１１の底部の周壁１４の端面は当接部１０ｆと面一でフェースプレート２０の背面に当接する当接部１４ａのみから構成されている。更に、空洞部１１の両側部の周壁１３の端面はフェースプレート２０の背面から離間し、離間部１２ｂと面一の離間部１３ａを有する。離間部１３ａは離間部１２ｂと異なり、周壁１３の厚み方向全域に渡って形成されている。   The head body 10 is formed with a cavity portion 11 that opens to the face plate 20 side and is closed on the back portion 10c side. The cavity 11 is defined by peripheral walls 12 to 14 formed integrally with the head body 10. Of the end surfaces of the peripheral walls 12 to 14 on the face plate 20 side, the end surface of the peripheral wall 12 at the upper part of the cavity portion 11 is flush with the contact portion 10f and a contact portion 12a that contacts the back surface of the face plate 20. And a separation portion 12b that is separated from the back surface of the face plate 20 inside the surface 12a. Further, the end surface of the peripheral wall 14 at the bottom of the cavity portion 11 is composed of only the abutting portion 14 a that is flush with the abutting portion 10 f and abuts against the back surface of the face plate 20. Furthermore, the end surfaces of the peripheral wall 13 on both sides of the cavity portion 11 are separated from the back surface of the face plate 20, and have a separation portion 13 a that is flush with the separation portion 12 b. Unlike the separation portion 12b, the separation portion 13a is formed over the entire thickness direction of the peripheral wall 13.

空洞部１１の両側には第２の空洞部１５がそれぞれ形成されている。空洞部１５はヘッド本体１０を軽量化するために設けられている。本実施形態では空洞部１５を空洞部１１の両側に設けているが片側にだけ設けることもできる。また、本実施形態では空洞部１５は空洞のままとするが、ここにゴルフクラブヘッドＡの重心位置を調整するための錘等を装填することも可能である。   Second cavities 15 are respectively formed on both sides of the cavity 11. The cavity 15 is provided to reduce the weight of the head body 10. In this embodiment, the cavity 15 is provided on both sides of the cavity 11, but it can be provided only on one side. In the present embodiment, the hollow portion 15 is left hollow, but a weight or the like for adjusting the position of the center of gravity of the golf club head A can be loaded therein.

空洞部１１とフェースプレート２０とにより形成される空間内には第１粘弾性体３０と第２粘弾性体４０とが圧縮状態で装填されている。第１粘弾性体３０はその正面３０ａがフェースプレート２０の背面に密着している。第２粘弾性体４０は第１粘弾性体３０の背部側に配置され、その正面４０ａが第１粘弾性体３０の背面３０ｂに密着している。   A first viscoelastic body 30 and a second viscoelastic body 40 are loaded in a compressed state in a space formed by the cavity 11 and the face plate 20. The front surface 30 a of the first viscoelastic body 30 is in close contact with the back surface of the face plate 20. The second viscoelastic body 40 is disposed on the back side of the first viscoelastic body 30, and the front surface 40 a is in close contact with the back surface 30 b of the first viscoelastic body 30.

第１粘弾性体３０と第２粘弾性体４０とは損失係数（ｔａｎδ）の温度依存性が異なる粘弾性材料から構成される。粘弾性材料の損失係数の温度依存性は、各温度に対するその粘弾性材料の振動減衰効果の程度を示すものであるが、各周波数に対するその粘弾性材料の振動減衰効果の程度に関係する。つまり、相対的に、低温度において損失係数が高い粘弾性材料は高周波数帯に対する振動減衰効果が高い一方、高温度において損失係数が高い粘弾性材料は低周波数帯に対する振動減衰効果が高い。本実施形態では、互いに損失係数の温度依存性が異なる粘弾性材料からなる第１粘弾性体３０と第２粘弾性体４０とを併用することで、より広範囲な周波数の振動を低減することができる。   The 1st viscoelastic body 30 and the 2nd viscoelastic body 40 are comprised from the viscoelastic material from which the temperature dependence of a loss coefficient (tan-delta) differs. The temperature dependence of the loss coefficient of the viscoelastic material indicates the degree of the vibration damping effect of the viscoelastic material for each temperature, and is related to the degree of the vibration damping effect of the viscoelastic material for each frequency. That is, a viscoelastic material having a relatively high loss coefficient at a low temperature has a high vibration damping effect for a high frequency band, whereas a viscoelastic material having a high loss coefficient at a high temperature has a high vibration damping effect for a low frequency band. In the present embodiment, vibrations in a wider range of frequencies can be reduced by using the first viscoelastic body 30 and the second viscoelastic body 40 made of viscoelastic materials whose loss coefficients have different temperature dependencies. it can.

第１粘弾性体３０及び第２粘弾性体４０を構成する粘弾性材料としては、例えば、ＩＩＲ（臭化ブチル組成物）、ＮＢＲ（アクリロニトリルブタジエンゴム）、天然ゴム、シリコンゴム、スチレン系ゴム等が挙げられる。第１粘弾性体３０及び第２粘弾性体４０は、上記粘弾性材料に例えば金属粉末等を混入して形成し、その比重を調整することもできる。   Examples of the viscoelastic material constituting the first viscoelastic body 30 and the second viscoelastic body 40 include IIR (butyl bromide composition), NBR (acrylonitrile butadiene rubber), natural rubber, silicon rubber, styrene rubber, and the like. Is mentioned. The first viscoelastic body 30 and the second viscoelastic body 40 can be formed by mixing, for example, metal powder into the viscoelastic material and adjusting the specific gravity thereof.

ここで、第１粘弾性体３０及び第２粘弾性体４０は、互いに損失係数のピーク値温度が異なる粘弾性材料から構成されることが望ましい。一般に粘弾性材料の損失係数はピーク値温度を境にして各温度に対する損失係数が徐々に下がる。従って、損失係数のピーク値温度が異なる粘弾性材料を併用することにより、より広範囲な周波数の振動を低減できる。   Here, the first viscoelastic body 30 and the second viscoelastic body 40 are preferably composed of viscoelastic materials having different peak values of loss coefficients. In general, the loss coefficient of a viscoelastic material gradually decreases with respect to each temperature at the peak temperature. Therefore, vibrations in a wider range of frequencies can be reduced by using viscoelastic materials having different peak values of loss coefficients in combination.

また、第１粘弾性体３０及び第２粘弾性体４０は、損失係数のピーク値がいずれも０．３以上の粘弾性材料から構成されることが望ましい。損失係数が０．３以上であると、より高い振動減衰効果が得られる。   Moreover, as for the 1st viscoelastic body 30 and the 2nd viscoelastic body 40, it is desirable to comprise from the viscoelastic material in which the peak value of a loss coefficient is 0.3 or more. When the loss factor is 0.3 or more, a higher vibration damping effect can be obtained.

また、第１粘弾性体３０を構成する粘弾性材料と第２粘弾性体４０を構成する粘弾性材料とは、その損失係数のピーク値温度が、一方が摂氏−３０度未満で、他方が摂氏−３０度以上であることが望ましい。損失係数のピーク値温度が摂氏−３０度未満の粘弾性材料は相対的に高周波数帯に対する振動減衰効果が高く、摂氏−３０度以上の粘弾性材料は相対的に低周波数帯に対する振動減衰効果が高い。従って、より広範囲な周波数の振動を低減できる。 In addition, the viscoelastic material constituting the first viscoelastic body 30 and the viscoelastic material constituting the second viscoelastic body 40 have a peak temperature of the loss coefficient of which one is less than −30 degrees Celsius and the other is It is desirable to be -30 degrees Celsius or higher. A viscoelastic material having a peak temperature of a loss factor of less than −30 degrees Celsius has a relatively high vibration damping effect for a high frequency band, and a viscoelastic material having a peak temperature of −30 degrees Celsius or higher is a vibration damping effect for a relatively low frequency band . Is expensive. Therefore, vibrations in a wider range of frequencies can be reduced.

また、第１粘弾性体３０を構成する粘弾性材料の損失係数のピーク値温度は第２粘弾性体４０の粘弾性材料の損失係数のピーク値温度よりも低いことが望ましい。インパクト時のゴルフクラブヘッドＡの振動は、フェースプレート２０において最も振動の周波数が高くなり、フェースプレート２０から離れるに従って振動の周波数が低くなると考えられる。そこで、フェースプレート２０に密着している第１粘弾性体３０を構成する粘弾性材料として、損失係数のピーク値温度が相対的に低い粘弾性材料を用いることで、フェースプレート２０において生じる高周波数の振動をより効果的に低減する一方、フェースプレート２０から離れている第２粘弾性体４０を構成する粘弾性材料として、損失係数のピーク値温度が相対的に高い粘弾性材料を用いることで、フェースプレート２０から離れた部位において生じる低周波数の振動をより効果的に低減することができる。 The peak value temperature of the loss factor of the viscoelastic material constituting the first viscoelastic body 30 and the lower this than the peak value temperature of the loss factor of the viscoelastic material of the second viscoelastic body 40 desirably. It is considered that the vibration of the golf club head A at the time of impact has the highest vibration frequency in the face plate 20 and the vibration frequency decreases as the distance from the face plate 20 increases. Therefore, by using a viscoelastic material having a relatively low loss coefficient peak value temperature as a viscoelastic material constituting the first viscoelastic body 30 in close contact with the face plate 20, a high frequency generated in the face plate 20 is obtained. By using a viscoelastic material having a relatively high loss coefficient peak value temperature as a viscoelastic material constituting the second viscoelastic body 40 separated from the face plate 20 Further, it is possible to more effectively reduce the low-frequency vibration that occurs in a part away from the face plate 20.

係る構成からなるゴルフクラブヘッドＡでは、その組立に際し、まず、ヘッド本体１０の空洞部１１に第１粘弾性体３０と第２粘弾性体４０とが挿入される。次に、図２（Ｂ）に示すように、フェースプレート２０の背面がヘッド本体１０の当接部１０ｆにぴったりと当接するようにフェースプレート２０がリブ１０ｅに画定されるヘッド本体１０の装着空間内に挿入される。その後、リブ１０ｅがフェースプレート２０の段部２０ｂへカシメられ、フェースプレート２０がヘッド本体１０に固定される。第１粘弾性体３０と第２粘弾性体４０とは空洞部１１内部にてこれらが圧縮されるようにその大きさが設計される。   In the golf club head A having such a configuration, first, the first viscoelastic body 30 and the second viscoelastic body 40 are inserted into the cavity 11 of the head body 10 when assembling. Next, as shown in FIG. 2B, the mounting space of the head main body 10 in which the face plate 20 is defined by the rib 10e so that the back surface of the face plate 20 is in close contact with the contact portion 10f of the head main body 10. Inserted in. Thereafter, the rib 10 e is crimped to the step portion 20 b of the face plate 20, and the face plate 20 is fixed to the head body 10. The sizes of the first viscoelastic body 30 and the second viscoelastic body 40 are designed so that they are compressed inside the cavity 11.

しかして、本実施形態のゴルフクラブヘッドＡでは互いに損失係数の温度依存性が異なる粘弾性材料からなる第１粘弾性体３０と第２粘弾性体４０とを併用することで、より広範囲な周波数の振動を低減することができる。第１粘弾性体３０と第２粘弾性体４０とはゴルフクラブヘッドＡの内部に配設されているので外部に露出せず、本体部１０及びフェースプレート２０により保護されるので、その損傷の発生を防止できる。また、第１粘弾性体３０と第２粘弾性体４０とは圧縮状態で空洞部１１及びフェースプレート２０により画定される空間内に装填されているので、第１粘弾性体３０及び第２粘弾性体４０がゴルフクラブヘッドＡに密着し、振動低減効果を高めることができる。   Therefore, in the golf club head A of the present embodiment, the first viscoelastic body 30 and the second viscoelastic body 40 made of viscoelastic materials having different temperature dependences of the loss coefficients can be used in combination, so that a wider frequency range can be obtained. Can be reduced. Since the first viscoelastic body 30 and the second viscoelastic body 40 are disposed inside the golf club head A, the first viscoelastic body 30 and the second viscoelastic body 40 are not exposed to the outside, and are protected by the main body 10 and the face plate 20. Occurrence can be prevented. Further, since the first viscoelastic body 30 and the second viscoelastic body 40 are loaded in a space defined by the cavity 11 and the face plate 20 in a compressed state, the first viscoelastic body 30 and the second viscoelastic body 30 are loaded. The elastic body 40 is in close contact with the golf club head A, and the vibration reduction effect can be enhanced.

また、空洞部１１を画定する周壁１２及び１３の端面に離間部１２ｂ及び１３ａを設けることで、周壁１２及び１３の端面に空洞部１１と連通した空隙が形成される。このため、圧縮状態の粘弾性体３０の一部が当該空隙内へはみ出すことが許容される。   Further, by providing the separation portions 12 b and 13 a on the end surfaces of the peripheral walls 12 and 13 that define the cavity portion 11, a gap communicating with the cavity portion 11 is formed on the end surfaces of the peripheral walls 12 and 13. For this reason, it is allowed that a part of the viscoelastic body 30 in a compressed state protrudes into the gap.

図２（Ｂ）は第１粘弾性体３０の一部が離間部１２ｂとフェースプレート２０との間の空隙にはみ出している状態を示している。従って、第１粘弾性体３０及び第２粘弾性体４０の圧縮代を大きくしても、ヘッド本体１０にフェースプレート２０を取り付ける際に、ヘッド本体１０とフェースプレート２０とが第１粘弾性体３０を噛んでしまう場合を防止することができる。特に、本実施形態の場合、離間部１３ａにより形成される空隙は空洞部１１のみならず、空洞部１５とも連通しているので、第１粘弾性体３０がはみ出すことが許容される量が多くなり、一層ヘッド本体１０とフェースプレート２０とが第１粘弾性体３０を噛んでしまう場合を防止することができる。また、第１粘弾性体３０の一部が離間部１２ｂ及び１３ａとフェースプレート２０との間の空隙にはみ出すことにより、第１粘弾性体３０とフェースプレート２０との密着面積もより大きくなる。   FIG. 2B shows a state where a part of the first viscoelastic body 30 protrudes into the gap between the separation portion 12 b and the face plate 20. Therefore, even when the compression allowance of the first viscoelastic body 30 and the second viscoelastic body 40 is increased, when the face plate 20 is attached to the head main body 10, the head main body 10 and the face plate 20 are connected to the first viscoelastic body. The case where 30 is bitten can be prevented. In particular, in the case of the present embodiment, since the gap formed by the separation portion 13a communicates with not only the cavity portion 11 but also the cavity portion 15, the amount that the first viscoelastic body 30 is allowed to protrude is large. Thus, the case where the head body 10 and the face plate 20 bite the first viscoelastic body 30 can be prevented. Further, when a part of the first viscoelastic body 30 protrudes into the gap between the spacing portions 12b and 13a and the face plate 20, the contact area between the first viscoelastic body 30 and the face plate 20 is further increased.

また、本実施形態では第１粘弾性体３０の正面３０ａと背面３０ｂとが平行に形成されて板状をなしており、周縁を除いてその厚みが均一に形成されている。第２粘弾性体４０はその正面４０ａが第１粘弾性体３０の背面に当接する平坦面を構成している。第１粘弾性体３０と第２粘弾性体４０とは、正面３０ａ、背面３０ｂ並びに正面４０ａがフェースプレート２０の背面と平行になるように、それらの形状並びに空洞部１１の形状が設計される。この構成により、第１粘弾性体３０の正面３０ａが略均一な圧力でフェースプレート２０の背面に密着し、密着性を向上できる。 In the present embodiment, the front surface 30a and the back surface 30b of the first viscoelastic body 30 are formed in parallel to form a plate shape, and the thickness thereof is uniform except for the peripheral edge. The second viscoelastic body 40 forms a flat surface whose front surface 40 a abuts against the back surface of the first viscoelastic body 30. The shapes of the first viscoelastic body 30 and the second viscoelastic body 40 and the shape of the cavity portion 11 are designed so that the front surface 30a, the back surface 30b, and the front surface 40a are parallel to the back surface of the face plate 20. . With this configuration, the front surface 30a of the first viscoelastic body 30 is in close contact with the back surface of the face plate 20 with substantially uniform pressure, and adhesion can be improved.

また、本実施形態では、空洞部１１はヘッド本体１０の下部側に形成されており、空洞部１１に装填される粘弾性体３０はヘッド本体１０の下部側に位置している。この構成により、ゴルフクラブヘッドＡの重心位置を下げることができ、低重心化を図ることができる。また、アイアン型のゴルフクラブではゴルフボールの打点位置がフェース面２０ａの下部寄りとなるので、ゴルフボールの打点位置の略背後に第１粘弾性体３０及び第２粘弾性体４０が位置することになり、第１粘弾性体３０及び第２粘弾性体４０による制振効果を向上できる。   In the present embodiment, the cavity 11 is formed on the lower side of the head body 10, and the viscoelastic body 30 loaded in the cavity 11 is located on the lower side of the head body 10. With this configuration, the position of the center of gravity of the golf club head A can be lowered, and the center of gravity can be lowered. In the iron-type golf club, the hit point position of the golf ball is closer to the lower part of the face surface 20a. Therefore, the first viscoelastic body 30 and the second viscoelastic body 40 are located substantially behind the hit point position of the golf ball. Thus, the vibration damping effect by the first viscoelastic body 30 and the second viscoelastic body 40 can be improved.

また、本実施形態では第１粘弾性体３０はフェースプレート２０に沿う方向の幅（図１のｄ）が、その上部から下方へ向かうに従い幅広となっており、空洞部１１もこれに対応した形状となっている。このため、第１粘弾性体３０の重心位置は下部寄りになっており、これによりゴルフクラブヘッドＡの重心位置を下げることができ、更に低重心化を図ることができる。   In the present embodiment, the first viscoelastic body 30 has a width in the direction along the face plate 20 (d in FIG. 1) that increases from the top to the bottom, and the cavity 11 corresponds to this. It has a shape. Therefore, the position of the center of gravity of the first viscoelastic body 30 is closer to the lower portion, whereby the position of the center of gravity of the golf club head A can be lowered, and the center of gravity can be further lowered.

なお、本実施形態では粘弾性体をフェースプレート２０の背後の位置に配設しているが、粘弾性体の配設位置はこれに限られず、種々の部位に装着することができる。また、第１粘弾性体３０と第２弾性体４０とは接している必要はなく、分離して配設されていてもよい。   In this embodiment, the viscoelastic body is disposed at a position behind the face plate 20, but the arrangement position of the viscoelastic body is not limited to this, and can be attached to various parts. Moreover, the 1st viscoelastic body 30 and the 2nd elastic body 40 do not need to be in contact, and may be arrange | positioned separately.

次に、本実施形態ではゴルフクラブヘッドに装着する粘弾性体を２つとしたが、これに限られず、３以上の粘弾性体をゴルフクラブヘッドに装着してもよい。この場合、各粘弾性体を構成する各々の粘弾性材料は相互に損失係数の温度依存性が異なるものであることが望ましい。図４（Ａ）乃至（Ｄ）はその例を示す図である。ゴルフクラブヘッドの振動はゴルフボールの打点位置によりその共振周波数が異なるものとなる。図４（Ａ）乃至（Ｄ）の例はゴルフボールの打点位置に応じて粘弾性体を配設することで、各種の共振周波数の振動の低減に効果を発揮し、広範囲な周波数の振動に対応する。   Next, although two viscoelastic bodies are attached to the golf club head in this embodiment, the present invention is not limited to this, and three or more viscoelastic bodies may be attached to the golf club head. In this case, it is desirable that each viscoelastic material constituting each viscoelastic body has a temperature coefficient of the loss coefficient different from each other. FIGS. 4A to 4D are diagrams showing examples thereof. The vibration of the golf club head has a different resonance frequency depending on the hit position of the golf ball. In the example of FIGS. 4A to 4D, a viscoelastic body is arranged according to the hitting position of the golf ball, so that the effect of reducing vibrations of various resonance frequencies is exhibited, and vibrations in a wide range of frequencies can be obtained. Correspond.

図４（Ａ）の例は第１粘弾性体３０に代わる粘弾性体３００を左右に分割した構成とし、損失係数の温度依存性が異なる粘弾性材料からなる粘弾性体３００ａと粘弾性体３００ｂとから構成したものである。従って、本例では３つの粘弾性体がゴルフクラブヘッドに装着され、かつ、それぞれ損失係数の温度依存性が異なる例である。この構成は、ゴルフボールの打点位置がヒール寄りの場合とトウ寄りの場合とで、ゴルフクラブヘッドが異なる周波数の振動を発生する場合に対応するものである。   In the example of FIG. 4A, a viscoelastic body 300 instead of the first viscoelastic body 30 is divided into left and right parts, and a viscoelastic body 300a and a viscoelastic body 300b made of viscoelastic materials having different temperature coefficients of loss coefficients. It is composed of Therefore, in this example, three viscoelastic bodies are mounted on the golf club head, and the temperature dependence of the loss coefficient is different. This configuration corresponds to a case where the golf club head generates vibrations with different frequencies depending on whether the hitting position of the golf ball is close to the heel or close to the toe.

図４（Ｂ）の例は第１粘弾性体３０に代わる粘弾性体３０１を上下に分割した構成とし、損失係数の温度依存性が異なる粘弾性材料からなる粘弾性体３０１ａと粘弾性体３０１ｂとから構成したものである。従って、本例も３つの粘弾性体がゴルフクラブヘッドに装着され、かつ、それぞれ損失係数の温度依存性が異なる例である。この構成は、ゴルフボールの打点位置が上側の場合と下側の場合とで、ゴルフクラブヘッドが異なる周波数の振動を発生する場合に対応するものである。 In the example of FIG. 4B, a viscoelastic body 301 instead of the first viscoelastic body 30 is divided into upper and lower parts, and a viscoelastic body 301a and a viscoelastic body 301b made of viscoelastic materials having different temperature coefficients of loss coefficients. It is composed of Therefore, this example is also an example in which three viscoelastic bodies are mounted on the golf club head, and the temperature dependence of the loss coefficient is different. This arrangement is intended to strike position of the golf ball in the case when the upper and lower, corresponding to the case where the golf club head generates vibration at different frequencies.

図４（Ｃ）の例は第１粘弾性体３０に代わる粘弾性体３０２を左右に３分割した構成とし、粘弾性体３０２ａと粘弾性体３０２ｂと粘弾性体３０２ｃとから構成したものである。従って、本例は４つの粘弾性体がゴルフクラブヘッドに装着され、かつ、それぞれ損失係数の温度依存性が異なる例である。この構成は、ゴルフボールの打点位置が、いわゆるスイートスポット近傍の場合とヒール寄りの場合とトウ寄りの場合とで、ゴルフクラブヘッドが異なる周波数の振動を発生する場合に対応するものである。   In the example of FIG. 4C, a viscoelastic body 302 that replaces the first viscoelastic body 30 is divided into three parts on the left and right, and is composed of a viscoelastic body 302a, a viscoelastic body 302b, and a viscoelastic body 302c. . Therefore, this example is an example in which four viscoelastic bodies are mounted on a golf club head and the temperature dependence of the loss coefficient is different. This configuration corresponds to the case where the golf club head generates vibrations with different frequencies depending on whether the hit point position of the golf ball is near the so-called sweet spot, near the heel, or near the toe.

図４（Ｄ）の例は第１粘弾性体３０に代わる粘弾性体３０３をその厚み方向に分割した構成とし、粘弾性体３０３ｂが粘弾性体３０３ａの周縁及び背部を覆うように構成したものである。従って、本例も３つの粘弾性体がゴルフクラブヘッドに装着され、かつ、それぞれ損失係数の温度依存性が異なる例である。この構成は、ゴルフボールの打点位置が、いわゆるスイートスポット近傍の場合と、その他の場合とで、ゴルフクラブヘッドが異なる周波数の振動を発生する場合に対応するものである。   In the example of FIG. 4D, a viscoelastic body 303 instead of the first viscoelastic body 30 is divided in the thickness direction, and the viscoelastic body 303b is configured to cover the periphery and back of the viscoelastic body 303a. It is. Therefore, this example is also an example in which three viscoelastic bodies are mounted on the golf club head, and the temperature dependence of the loss coefficient is different. This configuration corresponds to a case where the golf club head generates vibrations with different frequencies depending on whether the hit point position of the golf ball is near a so-called sweet spot or in other cases.

図４（Ｅ）の例は２つの粘弾性体をゴルフクラブヘッドに装着した例であるが、図４（Ｄ）の例について粘弾性体３０３ｂと第２粘弾性体４０とを一体化した粘弾性体４０'としたものである。   The example of FIG. 4E is an example in which two viscoelastic bodies are mounted on a golf club head. However, in the example of FIG. 4D, the viscoelastic body 303b and the second viscoelastic body 40 are integrated. The elastic body 40 ′ is used.

図１に示したゴルフクラブヘッドＡについて比較試験を行なった。本発明の実施例と比較例とにおいて使用した第１粘弾性体３０及び第２粘弾性体４０の粘弾性材料は以下の通りである。
・実施例：
臭化ブチル組成物（第１粘弾性体３０及び第２粘弾性体４０とで損失係数の温度依存性が異なる。）
・比較例１：
スチレン系熱可塑性エラストマ（第１粘弾性体３０及び第２粘弾性体４０とで損失係数の温度依存性は同じ。）
・比較例２：
アクリロニトリルブタジエンゴム（第１粘弾性体３０及び第２粘弾性体４０とで損失係数の温度依存性は同じ。）
・比較例３：
第１粘弾性体３０及び第２粘弾性体４０を装填しない。 A comparative test was conducted on the golf club head A shown in FIG. The viscoelastic materials of the first viscoelastic body 30 and the second viscoelastic body 40 used in the examples and comparative examples of the present invention are as follows.
·Example:
Butyl bromide composition (the temperature dependence of the loss coefficient is different between the first viscoelastic body 30 and the second viscoelastic body 40)
Comparative example 1:
Styrenic thermoplastic elastomer (the temperature dependence of the loss coefficient is the same between the first viscoelastic body 30 and the second viscoelastic body 40)
Comparative example 2:
Acrylonitrile butadiene rubber (the temperature dependence of the loss coefficient is the same between the first viscoelastic body 30 and the second viscoelastic body 40)
Comparative Example 3:
The first viscoelastic body 30 and the second viscoelastic body 40 are not loaded.

図５（Ａ）は実験に用いた各粘弾性材料の損失係数の温度依存性を示す図であり、１Ｈｚの振動に対する温度依存性を示す図である。同図において、線ａは実施例の第１粘弾性体３０に用いた粘弾性材料（臭化ブチル組成物）の損失係数の温度依存性、線ｂは実施例の第２粘弾性体４０に用いた粘弾性材料（臭化ブチル組成物）の損失係数の温度依存性、線ｃは比較例１の第１粘弾性体３０及び第２粘弾性体４０に用いた粘弾性材料（スチレン系熱可塑性エラストマ）の損失係数の温度依存性、線ｄは比較例２の第１粘弾性体３０及び第２粘弾性体４０に用いた粘弾性材料（アクリロニトリルブタジエンゴム）の損失係数の温度依存性を示す。 Figure 5 (A) is a graph showing the temperature dependence of the loss factor of each viscoelastic material used in the experiment is a diagram showing the temperature dependence of the oscillation of 1 Hz. In the figure, the line a represents the temperature dependence of the loss coefficient of the viscoelastic material (butyl bromide composition) used for the first viscoelastic body 30 of the example, and the line b represents the second viscoelastic body 40 of the example. Temperature dependence of loss factor of the used viscoelastic material (butyl bromide composition), line c indicates the viscoelastic material (styrene-based heat) used for the first viscoelastic body 30 and the second viscoelastic body 40 of Comparative Example 1. The temperature dependence of the loss coefficient of the plastic elastomer), line d shows the temperature dependence of the loss coefficient of the viscoelastic material (acrylonitrile butadiene rubber) used for the first viscoelastic body 30 and the second viscoelastic body 40 of Comparative Example 2. Show.

なお、実施例の第１粘弾性体３０、第２粘弾性体４０に用いた各粘弾性材料は、その損失係数のピーク値温度が異なっている。また、その損失係数のピーク値はいずれも０．３以上である。また、第１粘弾性体３０の粘弾性材料の損失係数のピーク値温度は摂氏−３０度未満である。第２粘弾性体４０の粘弾性材料の損失係数のピーク値温度は摂氏−３０度以上である。   In addition, each viscoelastic material used for the first viscoelastic body 30 and the second viscoelastic body 40 of the example has a different peak value temperature of the loss coefficient. Further, the peak value of the loss coefficient is 0.3 or more. The peak value temperature of the loss coefficient of the viscoelastic material of the first viscoelastic body 30 is less than −30 degrees Celsius. The peak temperature of the loss coefficient of the viscoelastic material of the second viscoelastic body 40 is −30 degrees Celsius or higher.

図５（Ｂ）は実施例及び比較例１乃至３の各ゴルフクラブヘッドに対する振動計測実験の結果を示す図であり、モーダル解析により減衰比を算出したものである。図中のプロットは各ゴルフクラブヘッドの共振周波数における減衰比を示しており、四角のプロットは実施例、黒丸のプロットは比較例１、白丸のプロットは比較例２、三角のプロットは比較例３を示す。実施例では広範囲の周波数において高い減衰比が得られていることが分かる。 FIG. 5 (B) shows the results of the vibration measurement experiment for each golf club head of the Examples and Comparative Examples 1 to 3, is obtained by calculating the attenuation ratio by modal analysis. The plot in the figure shows the damping ratio at the resonance frequency of each golf club head, the square plot is an example, the black circle plot is comparative example 1, the white circle plot is comparative example 2, and the triangular plot is comparative example 3. Indicates. In the embodiment, it can be seen that a high attenuation ratio is obtained in a wide range of frequencies.

Ａ ゴルフクラブヘッド
１０ 本体部
１１ 空洞部
１２〜１４ 周壁
１０ｆ、１２ａ、１４ａ 当接部
１２ｂ、１３ａ 離間部
１５ 空洞部
２０ フェースプレート
３０ 第１粘弾性体
４０ 第２粘弾性体 A Golf club head 10 Main body part 11 Cavity part 12-14 Peripheral walls 10f, 12a, 14a Contact part 12b, 13a Separation part 15 Cavity part 20 Face plate 30 First viscoelastic body 40 Second viscoelastic body

Claims (4)

第１の粘弾性材料からなる第１粘弾性体と、前記第１の粘弾性材料とは損失係数の温度依存性が異なる第２の粘弾性材料からなる第２粘弾性体と、が装着されたゴルフクラブヘッドにおいて、
ヘッド本体と、
前記ヘッド本体の正面側に取り付けられる前記フェースプレートと、を備え、
前記ヘッド本体は、前記フェースプレート側に開口し、前記ヘッド本体のバック部側で閉じた空洞部を有し、
前記第１及び第２粘弾性体が、前記空洞部と前記フェースプレートとにより形成される空間内に圧縮状態で装填され、
前記空洞部は、前記フェースプレート側から前記バック部側に向かって縮小し、
前記第２粘弾性体は、前記第１粘弾性体の背部側に配設され、前記第１粘弾性体よりも小さいことを特徴とするゴルフクラブヘッド。 A first viscoelastic body made of a first viscoelastic material and a second viscoelastic body made of a second viscoelastic material having a temperature coefficient of loss coefficient different from that of the first viscoelastic material are mounted. in the golf club head,
The head body,
The face plate attached to the front side of the head body,
The head body has a cavity that opens to the face plate side and is closed on the back side of the head body,
The first and second viscoelastic bodies are loaded in a compressed state in a space formed by the cavity and the face plate;
The hollow portion is reduced from the face plate side toward the back portion side,
The golf club head according to claim 1, wherein the second viscoelastic body is disposed on a back side of the first viscoelastic body and is smaller than the first viscoelastic body . 前記空洞部は、前記フェースプレート側から前記バック部側に向かって上下方向の幅が徐々に減少し、The hollow portion gradually decreases in width in the vertical direction from the face plate side toward the back portion side,
前記第１及び第２粘弾性体は板状をなし、その厚み方向に上下の幅が徐々に減少し、The first and second viscoelastic bodies are plate-shaped, and the vertical width gradually decreases in the thickness direction,
前記第１粘弾性体は前記第２粘弾性体よりも、その上下の幅が大きいことを特徴とする請求項１に記載のゴルフクラブヘッド。2. The golf club head according to claim 1, wherein the first viscoelastic body has a larger vertical width than the second viscoelastic body. 前記第１の粘弾性材料の損失係数のピーク値温度が前記第２の粘弾性材料の損失係数のピーク値温度よりも低いことを特徴とする請求項１又は２に記載のゴルフクラブヘッド。3. The golf club head according to claim 1, wherein a peak value temperature of a loss coefficient of the first viscoelastic material is lower than a peak value temperature of a loss coefficient of the second viscoelastic material. 前記ゴルフクラブヘッドは、アイアン型のゴルフクラブヘッドであることを特徴とする請求項１乃至３のいずれか１項に記載のゴルフクラブヘッド。 The golf club head, a golf club head according to any one of claims 1 to 3, characterized in that the golf club head of an iron type.
JP2011130581A 2011-06-10 2011-06-10 Golf club head Expired - Fee Related JP5021825B2 (en)

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US20140073450A1 (en) * 2011-11-28 2014-03-13 Acushnet Company Co-forged golf club head and method of manufacture
JP2015023946A (en) * 2013-07-25 2015-02-05 基宏 蘇 Iron golf club head
US20150119164A1 (en) * 2011-11-28 2015-04-30 Acushnet Company Co-forged golf club head and method of manufacture
US20160089581A1 (en) * 2011-11-28 2016-03-31 Acushnet Company Co-forged golf club head and method of manufacture
US20170182385A1 (en) * 2011-11-28 2017-06-29 Acushnet Company Co-forged golf club head and method of manufacture
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US20150119164A1 (en) * 2011-11-28 2015-04-30 Acushnet Company Co-forged golf club head and method of manufacture
US10220275B2 (en) 2011-11-28 2019-03-05 Acushnet Company Co-forged golf club head and method of manufacture
US20190175997A1 (en) * 2011-11-28 2019-06-13 Acushnet Company Co-forged golf club head and method of manufacture
US9387370B2 (en) * 2011-11-28 2016-07-12 Acushnet Company Co-forged golf club head and method of manufacture
US9616304B2 (en) * 2011-11-28 2017-04-11 Acushnet Company Co-forged golf club head and method of manufacture
US20170182385A1 (en) * 2011-11-28 2017-06-29 Acushnet Company Co-forged golf club head and method of manufacture
US10071292B2 (en) 2011-11-28 2018-09-11 Acushnet Company Co-forged golf club head and method of manufacture
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