JP2009153836A - Golf club shaft and its manufacturing method - Google Patents

Golf club shaft and its manufacturing method Download PDF

Info

Publication number
JP2009153836A
JP2009153836A JP2007337178A JP2007337178A JP2009153836A JP 2009153836 A JP2009153836 A JP 2009153836A JP 2007337178 A JP2007337178 A JP 2007337178A JP 2007337178 A JP2007337178 A JP 2007337178A JP 2009153836 A JP2009153836 A JP 2009153836A
Authority
JP
Japan
Prior art keywords
shaft
layer
reinforcing
reinforcing layer
golf club
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2007337178A
Other languages
Japanese (ja)
Other versions
JP5001825B2 (en
Inventor
Hiroyuki Suzuki
浩之 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Globeride Inc
Original Assignee
Daiwa Seiko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daiwa Seiko Co Ltd filed Critical Daiwa Seiko Co Ltd
Priority to JP2007337178A priority Critical patent/JP5001825B2/en
Publication of JP2009153836A publication Critical patent/JP2009153836A/en
Application granted granted Critical
Publication of JP5001825B2 publication Critical patent/JP5001825B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Golf Clubs (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club shaft which is collapse resistant and lightweight and its manufacturing method. <P>SOLUTION: The golf club shaft is made of a fiber-reinforced resin and has a straight or gently tapered large diameter section 10A formed in a prescribed length L2 from the base side end of the shaft and a tapered section 10B steeper than the large diameter section provided in the tip side adjacent to the large diameter section. A reinforcing layer P7 in which a reinforcing fiber is circumferentially directed is provided and an auxiliary layer P8 of a fiber-reinforced resin is provided outside the reinforcing layer in the length range including the steeply tapered section from the base side end of the shaft in addition to a body layer covering the overall length or 80% or more of the shaft, but not in the range of a prescribed length L1 from the base side end of the reinforcing layer. The external surface of the reinforcement layer is polished or ground and neither polishing nor grinding reaches the reinforcing fiber of the reinforcing layer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ゴルフクラブ用の繊維強化樹脂製のシャフトとその製法に関する。例えば、全長が114cmで、重量が55g以下に軽量化されたシャフトとその製法に関する。   The present invention relates to a shaft made of fiber reinforced resin for golf clubs and a method for producing the same. For example, the present invention relates to a shaft having a total length of 114 cm and a weight reduced to 55 g or less and a manufacturing method thereof.

元側領域がグリップ用の大径部であり、ヘッドを装着させる先側が細径部であるゴルフクラブ用シャフトは全長に亘って捩れや撓みに対して所定の剛性が必要である。また、先端部のヘッドでボールを打撃するものであるため、強度も求められる。更に、最近ではシャフトの軽量化が求められるようになってきている。下記特許文献1にはそうした剛性、強度、軽量化を満たすシャフトを提供しようとしている。
特許3652764号公報
A golf club shaft in which the former side region is a large-diameter portion for grip and the narrow side is the tip side on which the head is mounted needs to have a predetermined rigidity against twisting and bending over the entire length. Further, since the ball is hit with the head at the tip, strength is also required. Furthermore, recently, the weight reduction of the shaft has been demanded. Patent Document 1 below seeks to provide a shaft that satisfies such rigidity, strength, and weight reduction.
Japanese Patent No. 3655274

然しながら、特許文献1のシャフトでは、強化繊維が円周方向指向の層(直交層)をシャフト全長に対する大きな割合の領域に亘って積極的に設けている。従って、シャフトの潰れ破壊に対する強度は向上するが、軽量化の点では必ずしも可級的に軽量化させているとはいえない。
依って解決しようとする課題は、潰れにも強くて可級的に軽量なゴルフクラブ用シャフトとその製法を提供することである。
However, in the shaft of Patent Document 1, the reinforcing fiber is actively provided with a circumferentially oriented layer (orthogonal layer) over a large proportion of the entire shaft length. Accordingly, although the strength against crushing fracture of the shaft is improved, it cannot necessarily be said that the weight is reduced to a significant degree in terms of weight reduction.
Therefore, a problem to be solved is to provide a golf club shaft that is strong against crushing and is lightweight, and a manufacturing method thereof.

第1の発明では、繊維強化樹脂製のゴルフクラブ用シャフトであって、シャフトの元側端から所定長さ範囲に亘ってストレート又は緩いテーパの大径部が形成されており、該大径部に隣接した先側には、該大径部よりも急なテーパ部を設けており、シャフトの全長又は80%以上の長さに亘る本体層の他に、シャフトの元側端から前記急なテーパ部を含む長さ範囲内において、強化繊維が円周方向指向の補強層を設け、該補強層の外側に繊維強化樹脂の補助層が設けられているが、補強層の元側端から所定長さ範囲には設けられておらず、該補助層の外表面に研摩又は研削が施されており、前記補強層の強化繊維には研摩も研削も及んでいないことを特徴とするゴルフクラブ用シャフトを提供する。
大径部よりも急なテーパ部とは、大径部がストレートの場合も含んでいる。
In the first invention, the shaft for a golf club made of fiber reinforced resin, wherein a large diameter portion of a straight or loose taper is formed over a predetermined length range from the original side end of the shaft, the large diameter portion A taper portion that is steeper than the large-diameter portion is provided on the front side adjacent to the shaft. Within the length range including the taper portion, the reinforcing fiber is provided with a circumferentially oriented reinforcing layer, and an auxiliary layer of fiber reinforced resin is provided outside the reinforcing layer. A golf club characterized in that it is not provided in the length range, and the outer surface of the auxiliary layer is polished or ground, and the reinforcing fibers of the reinforcing layer are not polished or ground. Provide a shaft.
The taper portion steeper than the large diameter portion includes a case where the large diameter portion is straight.

第2の発明では、第1の発明の前記補強層と前記補助層は共に前記急なテーパ部に至っており、補助層は補強層の先側端よりも前方にまで至っており、該補助層の先側端はシャフト外表面として前記本体層に対して滑らかになるように研摩又は研削されているように構成する。   In the second invention, both the reinforcing layer and the auxiliary layer of the first invention reach the steep taper portion, and the auxiliary layer reaches the front of the front end of the reinforcing layer. The front end is polished or ground so as to be smooth with respect to the main body layer as the outer surface of the shaft.

第3の発明では、第1の発明又は第2の発明の前記補強層の円周方向強化繊維は炭素繊維であり、前記補助層の強化繊維はガラス繊維であり、該ガラス繊維は少なくとも2方向に交差するように配交されている。   In the third invention, the circumferential reinforcing fiber of the reinforcing layer of the first invention or the second invention is a carbon fiber, the reinforcing fiber of the auxiliary layer is a glass fiber, and the glass fiber has at least two directions. It is mated to cross.

第4の発明では、繊維強化樹脂製のゴルフクラブ用シャフトの製造方法であって、シャフトの元側端から所定長さ範囲に亘ってストレート又は緩いテーパの大径部が形成されており、該大径部に隣接した先側には、該大径部よりも急なテーパ部を設けており、シャフトの全長又は80%以上の長さに亘る本体層の他に、シャフトの元側端から前記急なテーパ部を含む長さ範囲内において、強化繊維が円周方向指向の補強層を設け、該補強層の外側に繊維強化樹脂の補助層用のプリプレグを設け、補強層の元側端から所定長さ範囲には設けられておらず、加圧用に表面に緊締テープを巻回して加熱成形し、加熱成形され、緊締テープを除去したシャフト素材の表面凹凸を研摩又は研削により除去する除去作業の際に、前記補強層の元側端から所定長さ範囲は前記除去作業をしないか又は凹凸を残す表面荒らしに留め、残りの補強層の領域では、前記補助層用プリプレグの巻回厚さ範囲内で前記除去作業を行うことを特徴とするゴルフクラブ用シャフトの製造方法を提供する。   According to a fourth aspect of the present invention, there is provided a golf club shaft manufacturing method made of fiber-reinforced resin, wherein a straight or loose tapered large-diameter portion is formed over a predetermined length range from the original side end of the shaft, A taper portion that is steeper than the large-diameter portion is provided on the front side adjacent to the large-diameter portion. In addition to the main body layer over the entire length of the shaft or a length of 80% or more, from the original end of the shaft Within the length range including the steep taper portion, the reinforcing fiber is provided with a circumferentially oriented reinforcing layer, a prepreg for an auxiliary layer of fiber reinforced resin is provided outside the reinforcing layer, and the original end of the reinforcing layer It is not provided in the predetermined length range, and is removed by grinding or grinding the surface irregularities of the shaft material that has been heated and molded by winding the fastening tape around the surface for pressurization and then removed from the fastening tape. When working, place it from the former end of the reinforcing layer. The length range is not subjected to the removal operation or is limited to roughening the surface leaving unevenness, and in the remaining reinforcing layer region, the removal operation is performed within the wound thickness range of the auxiliary layer prepreg. A method of manufacturing a golf club shaft is provided.

第1の発明では、シャフトとしての各剛性を維持しつつ軽量化を図ると、シャフトの元側端から所定長さ範囲であるグリップ用の大径部を特に薄肉化することになる。即ち、軽量化のために大径部を薄肉化しても、大径故に各剛性は確保できるが、潰れ強度が大きく低下する。その潰れに対する補強として、この大径部に強化繊維が円周方向指向の補強層を設ける。ここで、繊維強化樹脂製のシャフトを形成する場合、加圧用に緊締テープを巻回する手法のため、加圧加熱成形後のシャフト素材の表面には長手方向に沿った波打ち状の緊締テープ跡が形成されている。この緊締テープ跡をそのまま残置させてグリップ部材を接着接合させると、接合強度が低下する。そこで前記補強層の外側も研摩又は研削を行う必要が生じる。この作業によって、円周方向強化繊維を研摩や研削すれば潰れ補強効果が大きく低下する。このため、そうした研摩や研削を及ばなくさせる必要があり、補強層の外側に補助層を設け、研摩や研削はこの補助層の厚さ範囲内で行う。   In the first invention, when the weight is reduced while maintaining the rigidity as the shaft, the large-diameter portion for grip that is in a predetermined length range from the original side end of the shaft is particularly thinned. That is, even if the large-diameter portion is thinned for weight reduction, the rigidity can be ensured because of the large diameter, but the crushing strength is greatly reduced. As reinforcement against the collapse, a reinforcing layer in which the reinforcing fibers are oriented in the circumferential direction is provided on the large diameter portion. Here, when forming a shaft made of fiber reinforced resin, the surface of the shaft material after pressurization and heating molding has a wavy fastening tape mark along the longitudinal direction because of the technique of winding the fastening tape for pressurization. Is formed. If the grip tape is adhesively bonded while leaving the tightening tape mark as it is, the bonding strength decreases. Therefore, it is necessary to polish or grind the outside of the reinforcing layer. By this work, if the circumferential reinforcing fibers are polished or ground, the crushing reinforcement effect is greatly reduced. For this reason, it is necessary to avoid such polishing and grinding, and an auxiliary layer is provided outside the reinforcing layer, and the polishing and grinding are performed within the thickness range of the auxiliary layer.

然しながら、本願は可級的に軽量化を図るものであるため、研摩、研削後の補助層の残留量を可級的に少なくしたい。そこで、補助層を補強層の元側端から所定長さ範囲には設けないでおき、この範囲の補強層の外側は、研摩や研削を行わないか、行っても緊締テープ跡の凹凸を全て除去するのではなく、表面荒らし程度の作業にし、円周方向強化繊維を損傷させないようにしてもよい。表面荒らし程度の作業でも、それを全く行っていない素材表面のままよりは接合強度が向上する。即ち、グリップ部領域全体の緊締テープ跡を除去しなくても、グリップ部材の接着接合強度保持が可能である。グリップ部材の接着接合強度を考慮して、上記補助層を設けていない前記所定長さ範囲が短い場合は研摩や研削を行わないで済ますこともでき、長い場合は表面荒らし程度の研摩や研削を行う。
こうして、研摩や研削の及んでいない補強層の存在によってシャフトの潰れが防止でき、補助層も残留量を少なくすべく、補助層を設けない補強層の範囲が存在するため、可級的に軽量化できる。
However, since the present application is intended to reduce the weight as much as possible, it is desired to reduce the residual amount of the auxiliary layer after polishing and grinding as much as possible. Therefore, the auxiliary layer should not be provided in a predetermined length range from the original side end of the reinforcing layer, and the outer side of the reinforcing layer in this range is not polished or ground, or even if it is done, all the unevenness of the fastening tape mark will be Instead of removing the surface, the surface roughening operation may be performed so that the circumferential reinforcing fiber is not damaged. Even in the case of surface roughening work, the bonding strength is improved as compared with the surface of the material that is not subjected to any surface roughening. That is, the adhesive bonding strength of the grip member can be maintained without removing the tightening tape mark in the entire grip portion region. In consideration of the adhesive bond strength of the grip member, if the predetermined length range without the auxiliary layer is short, polishing or grinding can be omitted. Do.
In this way, the shaft can be prevented from being crushed by the presence of a reinforcing layer that has not been polished or ground, and the auxiliary layer also has a range of reinforcing layers that do not have an auxiliary layer in order to reduce the residual amount. Can be

第2の発明では、補強層の先側端ラインにおいて、補強層用のプリプレグ1枚分の厚さの段差が発生しているため、シャフトを撓ませた際にこの補強層先側端ラインにおいて応力集中が発生するが、補助層が補強層の外側に設けられていて補強層の先方にまで至っているので前記部位での応力集中は緩和防止される。また、シャフト成形後における研摩又は研削において、下側の補強層を研摩や研削することなく、補助層の先側端(ライン)付近を本体層に対して滑らかになるように(傾斜状に)研摩又は研削することができる。従って、研摩や研削で残った補助層の先側端においても応力集中は防止される。特に、大径部の先側に急テーパ部が設けられており、この部位は撓みが生じ始める部位であって補強層がこの急テーパ部に至っているため、応力集中が生じ易い部位であり、補助層の存在は効果的である。更には、本願のように可及的な軽量化を図る構造(薄肉化)の場合には、応力集中によってより損傷し易くなるので、応力集中防止構造は意義が大きい。   In the second aspect of the invention, since a step having a thickness corresponding to one prepreg for the reinforcing layer is generated in the leading end line of the reinforcing layer, the reinforcing layer leading end line is bent when the shaft is bent. Although stress concentration occurs, since the auxiliary layer is provided outside the reinforcing layer and reaches the tip of the reinforcing layer, stress concentration at the portion is prevented from mitigating. Also, in polishing or grinding after shaft molding, the vicinity of the front end (line) of the auxiliary layer is made smooth with respect to the main body layer (inclined) without polishing or grinding the lower reinforcing layer. Can be ground or ground. Therefore, stress concentration is also prevented at the front end of the auxiliary layer remaining after polishing and grinding. In particular, a steep taper portion is provided on the front side of the large-diameter portion, and this portion is a portion where bending starts and the reinforcing layer reaches this steep taper portion, which is a portion where stress concentration is likely to occur. The presence of the auxiliary layer is effective. Furthermore, in the case of a structure for reducing the weight as much as possible (thinning) as in the present application, the stress concentration prevention structure is significant because it is more easily damaged by stress concentration.

第3の発明では、補助層の強化繊維がガラス繊維であるため、補強層の炭素繊維よりも研摩や切削が容易な特性のため、研摩や研削する前のプリプレグ巻回状態補助層を研摩や研削作業をして限界近くまで薄くする場合に、それだけ、補強層の炭素繊維を損傷させ難い。   In the third invention, since the reinforcing fiber of the auxiliary layer is a glass fiber, it is easier to polish and cut than the carbon fiber of the reinforcing layer. When thinning to the limit by grinding, it is hard to damage the carbon fiber of the reinforcing layer.

第4の発明では、円周方向指向の強化繊維を損傷させないで凹凸の除去作業ができ、補助層用のプリプレグ層を十分に除去してもよいため、潰れに対する補強層の重量を最小にできる他、補助層の重量も最小にでき、シャフトの軽量化に寄与する。   In the fourth aspect of the invention, the unevenness can be removed without damaging the circumferentially oriented reinforcing fibers, and the prepreg layer for the auxiliary layer may be sufficiently removed, so that the weight of the reinforcing layer against crushing can be minimized. In addition, the weight of the auxiliary layer can be minimized, contributing to weight reduction of the shaft.

図1は、本発明に係るゴルフクラブ用シャフトを使用したゴルフクラブの正面図であり、図2はそのシャフトを製造する過程の説明図である。シャフト10の先端部にはゴルフクラブヘッド20が接着接合されており、元側所定領域にはグリップ部材Gが接着接合されている。シャフトは、エポキシ樹脂等の合成樹脂をマトリックスとし、炭素繊維やガラス繊維で強化した繊維強化樹脂製の管状体であり、芯金30にプリプレグを巻回し、最外層に緊締用のテープを巻回して加圧し、その状態で加熱炉において加熱成形し、緊締用テープを除去する。
加熱成形後にシャフト素材の前後端部をカット除去する除去分は、以下の説明では無いものとして長さ寸法等を説明しているが、現実の製造では、そうしたカット除去分を見込んだ長さのプリプレグで製造することがある。
FIG. 1 is a front view of a golf club using a golf club shaft according to the present invention, and FIG. 2 is an explanatory view of a process of manufacturing the shaft. A golf club head 20 is adhesively bonded to the tip portion of the shaft 10, and a grip member G is adhesively bonded to the original predetermined region. The shaft is a tubular body made of a fiber reinforced resin reinforced with carbon fiber or glass fiber using a synthetic resin such as an epoxy resin as a matrix. A prepreg is wound around the core 30 and a fastening tape is wound around the outermost layer. In this state, heat forming is performed in a heating furnace, and the fastening tape is removed.
The removed part that cuts and removes the front and rear ends of the shaft material after thermoforming is explained in terms of the length dimension, etc., as it is not the following explanation, but in actual manufacturing, the length that allowed for such cut removal May be manufactured with prepreg.

芯金30は、その元側のストレートか緩いテーパ率(直径差を離隔距離で除した値)3/1000以下のテーパ状の芯金大径部30Aと、これに隣接した急テーパ率、例えば、4/1000〜10/1000の急テーパ部30Bと、これに隣接した緩いテーパ率、例えば、2/1000〜3/1000の中間部30Cと、これに隣接した略ストレート部30Dとを有している。順序は上記の順で、夫々の部位の長さは350mm,80mm,520mm,290mmであり、図2の各直径D1,D2,D3,D4,D5は、13.25mm,12.30mm,11.65mm,7.40mm,4.90mmである。   The cored bar 30 has a taper-shaped cored bar large diameter portion 30A having a straight or loose taper ratio (a value obtained by dividing the difference in diameter by a separation distance) of 3/1000 or less, and a steep taper ratio adjacent thereto, for example, 4/1000 to 10/1000 have a steep taper portion 30B, a loose taper ratio adjacent thereto, for example, an intermediate portion 30C of 2/1000 to 3/1000, and a substantially straight portion 30D adjacent thereto. ing. The order is as described above, and the lengths of the respective portions are 350 mm, 80 mm, 520 mm, and 290 mm, and the diameters D1, D2, D3, D4, and D5 in FIG. 2 are 13.25 mm, 12.30 mm, 11. 65 mm, 7.40 mm, and 4.90 mm.

以下では合成樹脂は全てエポキシ樹脂であるが、他の合成樹脂を使用してもよい。
シャフトの全長に亘る本体層内の最内層として、強化繊維に弾性率40ton/mm(390000N/mm)の炭素繊維を使用したプリプレグP1を巻回する。繊維方向は±45度付近(30度〜60度)であり、プリプレグ厚さは0.09〜0.10mm、樹脂含浸率は20〜28重量%、巻回数は、例えば、1.5〜3.5回である。この層の外側に、本体層の中間層として、弾性率30ton/mm(294000N/mm)の炭素繊維を使用したプリプレグP2を巻回する。繊維方向は軸長方向であり、裏打ちも無い引き揃え繊維のプリプレグである。プリプレグ厚さは0.06〜0.12mm、樹脂含浸率は20〜28重量%、巻回数は、例えば、1.5〜3.5回である。強化繊維の弾性率は、プリプレグP1より外側層であるプリプレグP2を小さくすると共に、強度に関しては、プリプレグP2の強化繊維はプリプレグP1のものよりも高強度である。
In the following, all synthetic resins are epoxy resins, but other synthetic resins may be used.
As an innermost layer in the main body layer extending over the entire length of the shaft, a prepreg P1 using carbon fibers having an elastic modulus of 40 ton / mm 2 (390000 N / mm 2 ) as a reinforcing fiber is wound. The fiber direction is around ± 45 degrees (30 to 60 degrees), the prepreg thickness is 0.09 to 0.10 mm, the resin impregnation rate is 20 to 28% by weight, and the number of windings is, for example, 1.5 to 3 .5 times. A prepreg P2 using carbon fiber having an elastic modulus of 30 ton / mm 2 (294000 N / mm 2 ) is wound as an intermediate layer of the main body layer on the outside of this layer. The fiber direction is an axial length direction, and is an aligned fiber prepreg with no backing. The prepreg thickness is 0.06 to 0.12 mm, the resin impregnation rate is 20 to 28% by weight, and the number of windings is, for example, 1.5 to 3.5 times. The elastic modulus of the reinforcing fiber makes the prepreg P2 which is an outer layer smaller than the prepreg P1, and the strength of the reinforcing fiber of the prepreg P2 is higher than that of the prepreg P1.

上記プリプレグP2の層の外側であって、ゴルフクラブヘッド20を装着させる先端部領域には、弾性率24t/mm(235200N/mm)の炭素繊維を軸長方向に引き揃えたプリプレグP3を巻回する。樹脂含浸率は30〜35重量%、巻回数は2〜4回である。このプリプレグP3の外側に、更に弾性率24ton/mm(235200N/mm)の炭素繊維を軸長方向に引き揃えたプリプレグP4を巻回する。樹脂含浸率は30〜40重量%、巻回数は1〜3回である。 A prepreg P3 in which carbon fibers having an elastic modulus of 24 t / mm 2 (235200 N / mm 2 ) are aligned in the axial length direction is provided outside the prepreg P2 layer and at the tip end region where the golf club head 20 is mounted. Wind. The resin impregnation rate is 30 to 35% by weight, and the number of windings is 2 to 4 times. A prepreg P4 in which carbon fibers having an elastic modulus of 24 ton / mm 2 (235200 N / mm 2 ) are aligned in the axial length direction is wound around the prepreg P3. The resin impregnation rate is 30 to 40% by weight, and the number of windings is 1 to 3 times.

このプリプレグP4の層の外側に、本体層の最外側層として、弾性率30t/mm(294000N/mm)の炭素繊維を使用したプリプレグP5を巻回する。繊維方向は軸長方向であり、裏打ちも無い引き揃え繊維のプリプレグである。プリプレグ厚さは0.06〜0.12mm、樹脂含浸率は20〜28重量%、巻回数は、例えば、1〜3回である。以上により、シャフトの全長又はその80%以上に亘る本体層としては円周方向指向強化繊維の層は無い。 A prepreg P5 using carbon fiber having an elastic modulus of 30 t / mm 2 (294000 N / mm 2 ) is wound as an outermost layer of the main body layer around the prepreg P4 layer. The fiber direction is an axial length direction, and is an aligned fiber prepreg with no backing. The prepreg thickness is 0.06 to 0.12 mm, the resin impregnation rate is 20 to 28% by weight, and the number of windings is, for example, 1 to 3. As described above, there is no layer of circumferentially oriented reinforcing fibers as the main body layer covering the entire length of the shaft or 80% or more thereof.

上記プリプレグP5の外側であって、ゴルフクラブヘッド20を装着させる先端部領域に、ガラス繊維を交差状に織ったスクリムクロスのプリプレグP6を巻回する。プリプレグの厚さは0.02〜0.05mmであり、樹脂含浸率は26〜50重量%、ゴルフクラブヘッドのホーゼル孔の孔径との関係で、外径調節等のために巻回数は適宜数である。   A scrim cloth prepreg P6 in which glass fibers are woven in a cross shape is wound around the tip region where the golf club head 20 is mounted outside the prepreg P5. The thickness of the prepreg is 0.02 to 0.05 mm, the resin impregnation rate is 26 to 50% by weight, and the number of windings is an appropriate number for adjusting the outer diameter, etc. in relation to the hole diameter of the hosel hole of the golf club head. It is.

一方、プリプレグP5の層の外側であって、プリプレグP5の元側端から所定長さのプリプレグP7を巻回する。この例では、プリプレグP7は、その元側端の位置から先側の芯金大径部30A領域を覆い、急テーパ部30Bの領域にまで至っている。プリプレグP7の元側端ラインは芯金長手方向に対して直交しており、先側端ラインは傾斜状であって、プリプレグ形状は略台形状といえる。強化繊維は弾性率が24t/mm(235200N/mm)以上の炭素繊維を使用し、繊維方向は円周方向であり、裏打ちも無い引き揃え繊維である。プリプレグ厚さは0.03mm〜0.08mmであり、樹脂含浸率は30重量%以上、好ましくは35〜55重量%であり、巻回数は1〜2回である。このプリプレグP7の巻回層が特許請求の範囲に言う補強層である。この補強層は、本体層のプリプレグP5よりも肉厚の薄いプリプレグを使用し、巻回端部の応力集中を防止している。 On the other hand, a prepreg P7 having a predetermined length is wound around the outer side of the layer of the prepreg P5 and from the original side end of the prepreg P5. In this example, the prepreg P7 covers the region 30A of the leading metal core large diameter portion from the position of the original side end and reaches the region of the steeply tapered portion 30B. The original side end line of the prepreg P7 is orthogonal to the longitudinal direction of the core bar, the front side end line is inclined, and the prepreg shape can be said to be substantially trapezoidal. The reinforcing fiber is a carbon fiber having an elastic modulus of 24 t / mm 2 (235200 N / mm 2 ) or more, the fiber direction is a circumferential direction, and there is no backing. The prepreg thickness is 0.03 mm to 0.08 mm, the resin impregnation rate is 30% by weight or more, preferably 35 to 55% by weight, and the winding number is 1 to 2 times. The wound layer of the prepreg P7 is a reinforcing layer referred to in the claims. This reinforcing layer uses a prepreg that is thinner than the prepreg P5 of the main body layer, and prevents stress concentration at the winding end.

この例でのプリプレグP7の長さL0は290mmである。プリプレグP7の長さ(巻回領域)は、少なくともプレーヤーのグリップエンド側の手(右利きの場合は左手)が位置する領域をカバーすべく150mm以上である。グリップエンド側の手は他方の手よりもグリップ部を強く把持するので潰れ易いからである。従って、長さL0は150mm〜330mmがよい。   The length L0 of the prepreg P7 in this example is 290 mm. The length (winding area) of the prepreg P7 is 150 mm or more so as to cover at least the area where the hand on the grip end side of the player (left hand in the case of a right-handed person) is located. This is because the hand on the grip end side grips the grip portion more strongly than the other hand and is easily crushed. Accordingly, the length L0 is preferably 150 mm to 330 mm.

このプリプレグP7の元側端から距離L1だけ先側に離隔した位置に元側端を位置させて、プリプレグP8を巻回させる。このプリプレグP8の巻回層の研摩、研削後の残りが特許請求の範囲に言う補助層である。プリプレグP8は、そのプリプレグP8の元側端の芯金大径部30A領域から急テーパ部30Bの領域にまで至っている。プリプレグP8の元側端ラインは芯金長手方向に対して直交しており、先側端ラインは傾斜状であって、プリプレグ形状は略台形状といえる。強化繊維はガラス繊維であり、繊維を交差状に織ったスクリムクロスである。プリプレグ厚さは0.02〜0.05mmであり、上記プリプレグP7の厚さよりも薄い。樹脂含浸率は25〜60重量%、好ましくは30〜50重量%であり、巻回数は1〜3回、或いは3回以上でもよく、巻回するプリプレグの厚さと研摩(研削)量等の条件で設定する。ガラス繊維故、前記プリプレグP7に使用の炭素繊維よりも低弾性であるが、プリプレグP8の強化繊維として炭素繊維を使用する場合も、プリプレグP7の強化繊維よりも低弾性のものを使用する。   The prepreg P8 is wound by positioning the original side end at a position separated from the original side end of the prepreg P7 by a distance L1 ahead. The remaining after polishing and grinding of the wound layer of the prepreg P8 is an auxiliary layer described in the claims. The prepreg P8 extends from the core metal large-diameter portion 30A region at the former end of the prepreg P8 to the region of the steep taper portion 30B. The original side end line of the prepreg P8 is orthogonal to the longitudinal direction of the core bar, the front side end line is inclined, and the prepreg shape can be said to be substantially trapezoidal. The reinforcing fiber is a glass fiber, and is a scrim cloth in which the fibers are woven in a cross shape. The thickness of the prepreg is 0.02 to 0.05 mm, which is thinner than the thickness of the prepreg P7. The resin impregnation rate is 25 to 60% by weight, preferably 30 to 50% by weight, and the number of windings may be 1 to 3 or 3 or more. Conditions such as the thickness of the prepreg to be wound and the amount of polishing (grinding) Set with. Since it is a glass fiber, it has a lower elasticity than the carbon fiber used for the prepreg P7. However, when a carbon fiber is used as the reinforcing fiber of the prepreg P8, one having a lower elasticity than the reinforcing fiber of the prepreg P7 is used.

プリプレグP8の先側端ラインは芯金の急テーパ部30Bの領域に至っていると共に、このプリプレグP8の長さ範囲においてはプリプレグP7の層を完全に覆っている。
前記長さL1は、この例では70mmであり、一般に50mm〜100mmとする。
その他、軽量化目的を損なわない範囲で、シャフトのキックポイント位置近く等の適宜な位置に部分的な長さ範囲のプリプレグを設けて、シャフトの剛性調節を行うこと等も許容できる。こうしてプリプレグを巻回した後、外周に緊締テープを巻回して加圧しつつ、加熱炉で加熱成形し、緊締テープを除去するとシャフトの素材が成形できる。その表面には緊締テープの跡として、長手方向に波状となった凹凸が形成されている。そこで、この凹凸を除去すべく、前記補助層を含む補助層以降のシャフト素材の先側領域を研摩や研削作業する。
The front end line of the prepreg P8 reaches the region of the steep taper portion 30B of the core metal, and completely covers the layer of the prepreg P7 in the length range of the prepreg P8.
The length L1 is 70 mm in this example, and is generally 50 mm to 100 mm.
In addition, it is also possible to adjust the rigidity of the shaft by providing a prepreg having a partial length range at an appropriate position such as near the kick point position of the shaft within a range that does not impair the weight reduction purpose. After winding the prepreg in this manner, the material for the shaft can be formed by winding the fastening tape around the outer periphery and pressurizing it while heating it in a heating furnace and removing the fastening tape. On the surface, as a trace of the fastening tape, irregularities that are wavy in the longitudinal direction are formed. Therefore, in order to remove the unevenness, the front side region of the shaft material after the auxiliary layer including the auxiliary layer is polished or ground.

既述の通り、長さL1の領域は研摩や研削作業を行わないか、或いは、その凹凸の表面を荒らす研摩や研削作業を行い、凹凸跡を残す。補助層の研摩や研削では、補助層の強化繊維がガラス繊維であるため、少なくとも弾性率のより大きな、補強層の使用している炭素繊維よりも研摩や研削がされ易く、センタレス研摩や研削では、シャフト素材が真円でなくても、研摩等の対象としていない補助層内側の補強層の炭素繊維を不用意に研摩等することが防止できる。   As described above, the region of the length L1 is not subjected to polishing or grinding work, or is subjected to polishing or grinding work to roughen the surface of the unevenness to leave an unevenness mark. In the polishing and grinding of the auxiliary layer, since the reinforcing fiber of the auxiliary layer is glass fiber, it is easier to polish and grind than the carbon fiber used in the reinforcing layer, which has a higher elastic modulus. In centerless polishing and grinding, Even if the shaft material is not a perfect circle, careless polishing or the like of the carbon fiber of the reinforcing layer inside the auxiliary layer that is not targeted for polishing or the like can be prevented.

こうして形成された塗装前のシャフト10’が図2の最下に図示されている。この例では、全長L4は114cm、芯金大径部30Aに対応する握り大径部10Aの長さL2は例えば250mm、芯金急テーパ部30Bに対応する急テーパ部10Bの長さL3は芯金急テーパ部30Bの長さと同じ80mmである。握り大径部10Aの元側端の肉厚はこの例では0.75mmであるが、0.5〜1.0mmである。大径部10Aと急テーパ部10Bとの境界の肉厚は、この例では0.75mmであるが、0.5〜1.0mmである。、急テーパ部10Bの左端(図のL3の左端)の肉厚は、この例では0.70mmであるが、0.45〜0.95mmである。シャフト先端の肉厚は、この例では1.70mmであるが、1.30〜2.10mmである。特に、大径部10Aが薄肉化されているが、強化繊維が円周方向指向のプリプレグP7による補強層の存在で潰れに対しても強い。この補強層の長さ領域にはプリプレグP7以外には円周方向指向の強化繊維が存在していない。これに塗装を施しても重量は55g以下である。これにグリップ部材Gが接着接合される。   The shaft 10 'thus formed is shown at the bottom of FIG. In this example, the total length L4 is 114 cm, the length L2 of the grip large diameter portion 10A corresponding to the core metal large diameter portion 30A is, for example, 250 mm, and the length L3 of the sharp taper portion 10B corresponding to the core metal sharp taper portion 30B is the core. The length is 80 mm which is the same as the length of the gold sharp taper portion 30B. In this example, the wall thickness at the former side end of the grip large-diameter portion 10A is 0.75 mm, but is 0.5 to 1.0 mm. The wall thickness at the boundary between the large diameter portion 10A and the steep taper portion 10B is 0.75 mm in this example, but is 0.5 to 1.0 mm. The thickness of the left end (the left end of L3 in the figure) of the steep taper portion 10B is 0.70 mm in this example, but is 0.45 to 0.95 mm. The thickness of the shaft tip is 1.70 mm in this example, but is 1.30 to 2.10 mm. In particular, the large-diameter portion 10A is thinned, but the reinforcing fibers are strong against crushing due to the presence of the reinforcing layer formed by the circumferentially oriented prepreg P7. In the length region of this reinforcing layer, there is no reinforcing fiber oriented in the circumferential direction other than the prepreg P7. Even if this is coated, the weight is 55 g or less. The grip member G is adhesively bonded to this.

また、プリプレグP7の巻回された補強層の先側端傾斜ラインに沿って、プリプレグ厚さの段差が存在し、これによるシャフトの応力集中が起こり得るが、補助層用プリプレグP8がこの補強層の先側端傾斜ラインを覆って補助層を形成し、加熱成形後のシャフト素材表面を滑らかに研摩(研削)するため、補助層自身の先側傾斜ラインのプリプレグ厚さによる段差部もテーパ状に研摩されるため、応力集中を防止できる。   Further, there is a step difference in the thickness of the prepreg along the leading end inclined line of the reinforcing layer around which the prepreg P7 is wound, and stress concentration of the shaft due to this may occur, but the prepreg P8 for the auxiliary layer is used as the reinforcing layer. In order to smooth the surface of the shaft material after heat forming by forming an auxiliary layer covering the front side end inclined line of the material, the step part due to the prepreg thickness of the front side inclined line of the auxiliary layer itself is also tapered. Therefore, stress concentration can be prevented.

こうして形成されたシャフトを使用したゴルフクラブでは、シャフトが軽量故に、その軽量化分をヘッド20に付加することも可能であり、その分重量バランスを適宜調整したゴルフクラブの提供が可能となり、また、握り用の大径部の潰れ強度も十分なため、従来通り自在な握りが可能であって、自在なスイングが可能である。   In the golf club using the shaft formed in this way, since the shaft is lightweight, it is possible to add the reduced weight to the head 20, and it is possible to provide a golf club in which the weight balance is appropriately adjusted. Since the crushing strength of the large-diameter portion for gripping is sufficient, the grip can be freely performed as before, and the swing can be freely performed.

本発明は、ゴルフクラブ用の繊維強化樹脂製シャフトに利用できる。   The present invention can be used for a fiber-reinforced resin shaft for a golf club.

図1は本発明に係るゴルフクラブ用シャフトを使用したゴルフクラブの正面図である。FIG. 1 is a front view of a golf club using a golf club shaft according to the present invention. 図2は図1のシャフトを製造する過程の説明図である。FIG. 2 is an explanatory view of a process of manufacturing the shaft of FIG.

符号の説明Explanation of symbols

10 ゴルフクラブ用シャフト
10’ シャフト素材
P7 補強層用プリプレグ
P8 補助層用プリプレグ
DESCRIPTION OF SYMBOLS 10 Golf club shaft 10 'Shaft material P7 Reinforcement layer prepreg P8 Auxiliary layer prepreg

Claims (4)

繊維強化樹脂製のゴルフクラブ用シャフトであって、
シャフトの元側端から所定長さ範囲に亘ってストレート又は緩いテーパの大径部が形成されており、該大径部に隣接した先側には、該大径部よりも急なテーパ部を設けており、
シャフトの全長又は80%以上の長さに亘る本体層の他に、シャフトの元側端から前記急なテーパ部を含む長さ範囲内において、強化繊維が円周方向指向の補強層を設け、
該補強層の外側に繊維強化樹脂の補助層が設けられているが、補強層の元側端から所定長さ範囲には設けられておらず、該補助層の外表面に研摩又は研削が施されており、
前記補強層の強化繊維には研摩も研削も及んでいない
ことを特徴とするゴルフクラブ用シャフト。
A golf club shaft made of fiber reinforced resin,
A large-diameter portion with a straight or loose taper is formed over a predetermined length range from the original end of the shaft, and a taper portion steeper than the large-diameter portion is formed on the front side adjacent to the large-diameter portion. Provided,
In addition to the main body layer over the entire length of the shaft or a length of 80% or more, in the length range including the steep taper portion from the original side end of the shaft, the reinforcing fiber is provided with a circumferentially oriented reinforcing layer,
An auxiliary layer of fiber reinforced resin is provided outside the reinforcing layer, but is not provided within a predetermined length range from the original side end of the reinforcing layer, and the outer surface of the auxiliary layer is polished or ground. Has been
A golf club shaft, wherein the reinforcing fiber of the reinforcing layer is not polished or ground.
前記補強層と前記補助層は共に前記急なテーパ部に至っており、補助層は補強層の先側端よりも前方にまで至っており、該補助層の先側端はシャフト外表面として前記本体層に対して滑らかになるように研摩又は研削されている請求項1記載のゴルフクラブ用シャフト。   The reinforcing layer and the auxiliary layer both reach the steep taper portion, the auxiliary layer extends further forward than the front end of the reinforcing layer, and the front end of the auxiliary layer serves as the outer surface of the shaft. 2. The golf club shaft according to claim 1, wherein the golf club shaft is polished or ground so as to be smooth. 前記補強層の円周方向強化繊維は炭素繊維であり、前記補助層の強化繊維はガラス繊維であり、該ガラス繊維は少なくとも2方向に交差するように配交されている請求項1又は2記載のゴルフクラブ用シャフト。   The circumferential reinforcing fibers of the reinforcing layer are carbon fibers, the reinforcing fibers of the auxiliary layer are glass fibers, and the glass fibers are arranged so as to intersect at least two directions. Golf club shaft. 繊維強化樹脂製のゴルフクラブ用シャフトの製造方法であって、
シャフトの元側端から所定長さ範囲に亘ってストレート又は緩いテーパの大径部が形成されており、該大径部に隣接した先側には、該大径部よりも急なテーパ部を設けており、
シャフトの全長又は80%以上の長さに亘る本体層の他に、シャフトの元側端から前記急なテーパ部を含む長さ範囲内において、強化繊維が円周方向指向の補強層を設け、
該補強層の外側に繊維強化樹脂の補助層用のプリプレグを設け、補強層の元側端から所定長さ範囲には設けられておらず、
加圧用に表面に緊締テープを巻回して加熱成形し、
加熱成形され、緊締テープを除去したシャフト素材の表面凹凸を研摩又は研削により除去する除去作業の際に、前記補強層の元側端から所定長さ範囲は前記除去作業をしないか又は凹凸を残す表面荒らしに留め、残りの補強層の領域では、前記補助層用プリプレグの巻回厚さ範囲内で前記除去作業を行う
ことを特徴とするゴルフクラブ用シャフトの製造方法。
A method of manufacturing a golf club shaft made of fiber-reinforced resin,
A large-diameter portion with a straight or loose taper is formed over a predetermined length range from the original end of the shaft, and a taper portion steeper than the large-diameter portion is formed on the front side adjacent to the large-diameter portion. Provided,
In addition to the main body layer over the entire length of the shaft or a length of 80% or more, in the length range including the steep taper portion from the original side end of the shaft, the reinforcing fiber is provided with a circumferentially oriented reinforcing layer,
A prepreg for an auxiliary layer of fiber reinforced resin is provided outside the reinforcing layer, and is not provided in a predetermined length range from the original side end of the reinforcing layer,
A pressure-sensitive adhesive tape is wound around the surface for pressurization and thermoformed.
When removing the surface irregularities of the shaft material that has been heat-formed and from which the fastening tape has been removed by grinding or grinding, a predetermined length range from the original side end of the reinforcing layer is not subjected to the removal operation or leaves irregularities. A method for producing a shaft for a golf club, characterized in that the removal operation is performed within the range of the winding thickness of the auxiliary layer prepreg in the remaining reinforcing layer region.
JP2007337178A 2007-12-27 2007-12-27 Golf club shaft and its manufacturing method Active JP5001825B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007337178A JP5001825B2 (en) 2007-12-27 2007-12-27 Golf club shaft and its manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007337178A JP5001825B2 (en) 2007-12-27 2007-12-27 Golf club shaft and its manufacturing method

Publications (2)

Publication Number Publication Date
JP2009153836A true JP2009153836A (en) 2009-07-16
JP5001825B2 JP5001825B2 (en) 2012-08-15

Family

ID=40958485

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007337178A Active JP5001825B2 (en) 2007-12-27 2007-12-27 Golf club shaft and its manufacturing method

Country Status (1)

Country Link
JP (1) JP5001825B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012245309A (en) * 2011-05-31 2012-12-13 Dunlop Sports Co Ltd Golf club shaft

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10694A (en) * 1996-06-14 1998-01-06 Daiwa Seiko Inc Tube-like unit
JPH11155986A (en) * 1997-11-28 1999-06-15 Daiwa Seiko Inc Golf club shaft
JP2004057673A (en) * 2002-07-31 2004-02-26 Sumitomo Rubber Ind Ltd Golf club shaft
JP2005270343A (en) * 2004-03-24 2005-10-06 Sumitomo Rubber Ind Ltd Golf club shaft and manufacturing method thereof
JP2006000496A (en) * 2004-06-18 2006-01-05 Mamiya Op Co Ltd Shaft for golf club

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10694A (en) * 1996-06-14 1998-01-06 Daiwa Seiko Inc Tube-like unit
JPH11155986A (en) * 1997-11-28 1999-06-15 Daiwa Seiko Inc Golf club shaft
JP2004057673A (en) * 2002-07-31 2004-02-26 Sumitomo Rubber Ind Ltd Golf club shaft
JP2005270343A (en) * 2004-03-24 2005-10-06 Sumitomo Rubber Ind Ltd Golf club shaft and manufacturing method thereof
JP2006000496A (en) * 2004-06-18 2006-01-05 Mamiya Op Co Ltd Shaft for golf club

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012245309A (en) * 2011-05-31 2012-12-13 Dunlop Sports Co Ltd Golf club shaft

Also Published As

Publication number Publication date
JP5001825B2 (en) 2012-08-15

Similar Documents

Publication Publication Date Title
JP5080886B2 (en) Golf club shaft
JP5828759B2 (en) Golf club shaft
JP5191563B1 (en) Golf club shaft
JP2009254601A (en) Golf club shaft
JP2008307701A (en) Manufacturing method of tube made of fiber-reinforced resin and tube manufactured by the same
KR102388862B1 (en) Golf club
JP2013081694A (en) Golf club shaft and golf club
JP6188302B2 (en) Golf club shaft
JP5001825B2 (en) Golf club shaft and its manufacturing method
JP6375704B2 (en) Golf club and shaft
JP5133109B2 (en) Golf club shaft
JP2007185253A (en) Golf club shaft
JP2015027399A (en) Golf club shaft
JP6166141B2 (en) Golf club shaft
JP2015029743A (en) Golf club shaft
JP2005270343A (en) Golf club shaft and manufacturing method thereof
JP2018094085A (en) Golf club shaft and golf club
JP4997154B2 (en) Golf club shaft and manufacturing method thereof
JP5291356B2 (en) Golf club shaft
JP2004057642A (en) Golf shaft
JP5244255B2 (en) Golf club shaft and golf club
JP2005176960A (en) Golf club shaft
JP5244528B2 (en) Golf club shaft and golf club
JP2007252574A (en) Shaft for golf club
JP2006000496A (en) Shaft for golf club

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20091214

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110913

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20110915

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20120419

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20120518

R150 Certificate of patent or registration of utility model

Ref document number: 5001825

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150525

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250