US20090075752A1 - Golf club head - Google Patents

Golf club head Download PDF

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Publication number
US20090075752A1
US20090075752A1 US12/230,611 US23061108A US2009075752A1 US 20090075752 A1 US20090075752 A1 US 20090075752A1 US 23061108 A US23061108 A US 23061108A US 2009075752 A1 US2009075752 A1 US 2009075752A1
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US
United States
Prior art keywords
club head
head
club
less
inertia
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.)
Abandoned
Application number
US12/230,611
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English (en)
Inventor
Tomoya Hirano
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.)
Dunlop Sports Co Ltd
Original Assignee
SRI Sports 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 SRI Sports Ltd filed Critical SRI Sports Ltd
Assigned to SRI SPORTS LIMITED reassignment SRI SPORTS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIRANO, TOMOYA
Publication of US20090075752A1 publication Critical patent/US20090075752A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0466—Heads wood-type
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0408—Heads characterised by specific dimensions, e.g. thickness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0408—Heads characterised by specific dimensions, e.g. thickness
    • A63B53/0412—Volume

Definitions

  • the present invention relates to a golf club head capable of reducing the variation in the carry distance of a struck ball and thereby increasing the carry distances in totality.
  • the directional stability of a struck ball is an important factor for stabilizing the carry distance. If the ball is struck off-center, the club head is moved or rotates around the center of gravity of the head more or less. If such a rotational movement of the club head at the time of off-center shot is reduced, then the lunching direction of the struck ball is stabilized.
  • the vertical gear effect is as follows. If the ball hitting position is off the sweet spot SS upwards or downwards, then as shown in FIG. 6 , with respect to a horizontal axis extending in the toe-heel direction passing through the center of gravity G of the head, there is caused a moment which is a product of the impact force F received from the golf ball (b) and the distance L 1 or L 2 between the hitting position and the center of gravity G measured perpendicular to the direction of the force F. As a result, the club head is rotated around the horizontal axis by a small angle.
  • the contact surface of the golf ball receives a force in the reverse direction to the rotational direction of the club head like a gear.
  • the backspin of the struck ball is decreased in the case of an upper hitting position or increased in the case of a lower hitting position.
  • an object of the present invention to provide a golf club head in which, by increasing the lateral moment of inertia and decreasing the thickness of the club head, the vertical moment of inertia is decreased on the whole, and thereby the variation in the carry distance can be reduced.
  • a hollow golf club head has a head volume of not less than 430 cc, a lateral moment of inertia of from 5000 to 5900 g sq ⁇ cm, and a club head thickness of from 45 to 58 mm.
  • the lateral moment of inertia is very large, even if the ball hitting position is off the sweet spot toward the toe or heel, the lateral movement of the club head becomes very small, and the directional stability of the struck ball is improved, therefore, the decrease in the carry distance is controlled.
  • the standard state of the club head 1 is such that the club head is set on a horizontal plane HP so that the center line CL of the club shaft (not shown) is inclined at the lie angle (alpha) while keeping the club shaft center line CL on a vertical plane VP 1 , and the club face 2 forms its loft angle (beta) with respect to the horizontal plane HP.
  • the center line of the shaft inserting hole (h) can be used instead of the center line of the club shaft.
  • Lateral moment of inertia Ma is the moment of inertia around a vertical axis A 1 passing through the center of gravity G in the standard state.
  • Vertical moment of inertia Mb is the moment of inertia around a horizontal axis A 2 passing through the center of gravity G in the heel-and-toe direction of the head in the standard state.
  • Sweet spot SS is the point of intersection between the club face and a straight line N drawn normally to the club face 2 passing the center of gravity G of the head.
  • Back-and-forth direction is a direction parallel with the above-mentioned straight line N projected on the horizontal plane HP.
  • Heel-and-toe direction is a direction TH parallel with the horizontal plane HP and perpendicular to the back-and-forth direction.
  • Club head thickness H is the height measured from the horizontal plane HP to the highest point (m) on the crown portion of the club head, namely, the highest point of the head excluding the upwardly protruding hosel portion if any.
  • Sweet spot height GH is a height of the sweet spot Ss measured from the horizontal plane HP.
  • Face progression FP is the horizontal distance between the leading edge Le of the club head and the vertical plane VP 1 including the club shaft center line CL, measured in a vertical plane VP 3 including the sweet spot SS and the center of gravity G.
  • Leading edge Le is a contact point between the club face 2 and a vertical plane VP 2 parallel with the vertical plane VP 1 .
  • Gravity point depth GL is the horizontal distance between the center of gravity G and the vertical plane VP 2 .
  • Wood-type golf club is meant for at least number 1 to 5 woods, and clubs comprising heads having similar shapes may be included.
  • a virtual edge line (Pe) defined based on the curvature change is used instead as follows.
  • a point Pe at which the radius (r) of curvature of the profile line Lf of the face portion first becomes under 200 mm in the course from the center ss to the periphery of the club face is determined.
  • the virtual edge line is defined as a locus of the points Pe.
  • FIG. 1 is a front view a club head according to the present invention.
  • FIG. 2 is a top view of the club head.
  • FIG. 3 is a cross sectional view taken along a vertical plane (line A-A in FIG. 2 ) including the sweet spot and the center of gravity of the club head.
  • FIG. 4 is a heel-side side view of the club head.
  • FIG. 6 is a cross sectional view for explaining a vertical gear effect of a club head.
  • golf club head 1 is a wood-type hollow golf club head.
  • the head 1 comprises a face portion 3 whose front face defines a club face 2 for striking a ball; a crown portion 4 intersecting the club face 2 at the upper edge 2 a thereof; a sole portion 5 intersecting the club face 2 at the lower edge 2 b thereof; a side portion 6 between the crown portion 4 and sole portion 5 ; and a hosel portion 7 disposed at the heel-side end to be attached to an end of a club shaft inserted into a shaft inserting hole (h).
  • the club head 1 is provided a shell structure with thin walls having a closed hollow (i).
  • the club face 2 is provided with a face roll (a curvature from crown to sole) of a radius of curvature PR, and a face bulge (a curvature from heel to toe) of a radius of curvature RB.
  • the outer surface of the crown portion 4 is convexly curved. Thus, apart from the hosel portion 7 , the highest point (m) is positioned within the outer surface of the crown portion 4 .
  • the hosel portion 7 has a tubular portion protruding upwardly from the crown portion 4 and defining the shaft inserting hole (h).
  • the outer surface of the hosel portion 7 is connected to the outer surface of the crown portion 4 through a transitional concave curve.
  • the side portion 6 can be formed to extend continuously from the toe to the heel through the rear of the head. But, in this embodiment, the side portion 6 is formed discontinuously.
  • the club head 1 is made of metal materials. But, in order to reduce the club head weight and/or to adjust the position of the center of gravity G of the head, a fiber reinforced resin can be used together with the metal materials.
  • metal materials having a large specific tensile strength for example, stainless steels, maraging steels, pure titanium, titanium alloys, magnesium alloys aluminum alloys and the like are.
  • the titanium alloys for example Ti-6Al-4V, Ti-15V-3Cr-3Al-3Sn, Ti-15Mo-5Zr-3Al, Ti-13V-11Cr-3Al and the like are be preferably used.
  • the club head 1 is manufactured by assembling a plurality of parts (usually 2 to 5 parts) each prepared by an appropriate method, for example, casting, rolling, forging, pressure molding or the like.
  • the volume of the club head 1 is set in a range of not less than 430 cc, preferably not less than 440 cc, more preferably not less than 450 cc.
  • Such a large head volume can give the user easy feelings at the time of addressing the ball and can increase the gravity point depth GL and the lateral moment of inertia Ma so as to improve the directional stability of the struck ball.
  • the volume is set to be not more than 600 cc, preferably not more than 550 cc. If golf rules are considered, the volume should be not more than 460 cc.
  • the mass of the club head 1 is preferably not less than 180 g, more preferably not less than 185 g, but preferably not more than 210 g, more preferably not more than 205 g.
  • the club head is provided with a relatively large volume of more than 430 cc and the area of the club face 2 is relatively large as a necessary consequence, when the ball hitting position is off the sweet spot towards the heel or toe, there is possibility that the distance in the heel-and-toe direction between the hitting position and the sweet spot becomes very large. Even in such a condition, in order that the rotational movement (head movement) of the club head 1 around the vertical axis A 1 is surely reduces to thereby stabilize the direction of the struck ball, the lateral moment of inertia Ma should be large enough.
  • the lateral moment of inertia Ma has to be increased up to 5000 g sq ⁇ cm at least.
  • the lateral moment of inertia Ma is not less than 5300 g sq ⁇ cm, more preferably not less than 5500 g sq ⁇ cm.
  • the lateral moment of inertia Ma is at most 5900 g sq ⁇ cm.
  • the present inventor discovered that the club head thickness H and the vertical moment of inertia Mb have a certain correlation and that the vertical moment of inertia Mb can be kept at small values by reducing the club head thickness H.
  • the increase in the vertical moment of inertia Mb can be restrained even when the head volume is increased up to 430 cc at least and also the lateral moment of inertia Ma is increased up to 5000 g sq ⁇ cm at least.
  • the club head thickness H is preferably set in a range of from not less than 45 mm, more preferably not less than 47 mm, still more preferably not less than 49 mm.
  • the vertical moment of inertia Mb is preferably set in a range of not more than 5000 g sq ⁇ cm, more preferably not more than 4500 g sq ⁇ cm, still more preferably not more than 4000 g sq ⁇ cm.
  • the vertical moment of inertia Mb is preferably not less than 2500 g sq ⁇ cm, more preferably not less than 2700 g sq ⁇ cm, still more preferably not less than 3000 g sq ⁇ cm.
  • the club head 1 is subjected to a rotational movement as indicated in broken line such that the center of gravity G approaches the extension of the club shaft center line CL when viewed from the heel side of the head.
  • the loft angle is varied depending on the swing speed, thus, it is difficult for the user to control the ballistic course and carry distance of the ball.
  • the club head 1 in this example has a streamline shape, and the crown surface length LC is set to be longer than the sole surface length LS.
  • the contour of the crown portion 4 and the contour of the sole portion 5 are each defined by a smoothly curved arc line, and they are extended continuously from the edge ( 2 a , 2 b ) of the face portion to the rearmost point BP and connected with each other at the point BP without the side portion 6 therebetween.
  • the crown surface length LC is defined as the length measured along the outer surface of the crown portion 4 from the upper edge 2 a of the club face 2 to the rearmost point BP, and
  • the sole surface length LS is defined as the length measured along the outer surface of the sole portion 5 from the lower edge 2 b of the club face 2 to the rearmost point BP.
  • the side portion 6 is interrupted, and the head has a streamline shape.
  • the velocity of air flow along the surface of the crown portion becomes faster than the velocity of air flow along the surface of the sole portion, and the air pressure to the crown portion becomes lower than the air pressure to the sole portion, and the club head 1 , in particular its rear part, obtains lift. Therefore, the above-mentioned rotational movement of the head is reduced, and the resultant increase of the loft angle can be avoided, and thereby the carry distances become stable.
  • the ratio (LC/LS) of the crown surface length LC to the sole surface length LS is less than 1.02, the lifting is still insufficient. But, if the ratio (LC/LS) is more than 1.20, there is a tendency that the lifting and the restraint of the increase in the loft angle become excess. Therefore, the ratio (LC/LS) is preferably not less than 1.02, more preferably not less than 1.05, but preferably not more than 1.20, more preferably not more than 1.10, still more preferably not more than 1.09.
  • the crown surface length LC is preferably not less than 105 mm, more preferably not less than 108 mm, still more preferably not less than 110 mm, but not more than 125 mm, more preferably not more than 122 mm, still more preferably not more than 120 mm.
  • the sole surface length LS preferably not less than 100 mm, more preferably not less than 103 mm, still more preferably not less than 105 mm, but not more than 120 mm, more preferably not more than 117 mm, still more preferably not more than 115 mm.
  • the ratio (LC/LS) can be changed for example by setting the radius of curvature of the contour of the crown portion 4 at smaller values than that of the sole portion 5 and by decreasing the height BH of the rearmost point BP.
  • the height BH is preferable because the height of the center of gravity G is also decreased thereby.
  • the height BH is preferably not more than 30 mm, more preferably not more than 28 mm, still more preferably not more than 25 mm.
  • the sweet spot height GH is preferably set in a range of not more than 38 mm, more preferably not more than 36 mm, still more preferably not more than 34 mm, but not less than 25 mm, more preferably not less than 27 mm, still more preferably not less than 29 mm.
  • the face progression FP has influence upon the returning motion of the club head from swing and upon the timing of impacting the ball.
  • the face progression FP in a range of not less than 17 mm, preferably not less than 19 mm, but not more than 28 mm, preferably not more than 26 mm, more preferably not more than 25 mm, the directional stability of the struck ball can be improved to stabilize the carry distance.
  • the gravity point depth GL is preferably not less than 30 mm, more preferably not less than 32 mm, still more preferably not less than 33 mm. If the depth GL is too large, on the other hand, the head tends to become insensitive to the impact feeling. Further, the position of the sweet spot SS tends to become high, and potential for off-center hit (lower hit) increases. It is therefore preferable that the gravity point depth GL is set to be not more than 60 mm, more preferably not more than 57 mm, still more preferably not more than 55 mm.
  • the size HL of the club head 1 measured in the back-and-forth direction from the leading edge Le to the rearmost point BP is preferably set in a range of not less than 110 mm, more preferably not less than 115 mm, but not more than 127 mm, more preferably not more than 125 mm.
  • the club head 1 is decreased in the club head thickness H and the vertical moment of inertia Mb as explained above, the vertical gear effect occurs more or less.
  • the face roll is provided throughout the club face 2 and the radius of curvature PR is set in a range of not less than 12 inches, preferably not less than 14 inches, more preferably not less than 16 inches, but not more than 25 inches, preferably not more than 23 inches, more preferably not more than 21 inches.
  • These specific values of the radius of curvature RR are measured in the above-mentioned vertical plane VP 3 for the part between a point Pu 10 mm downward from the upper edge 2 a along the club face 2 and a point Pd 10 mm upward from the lower edge 2 b along the club face 2 , as shown in FIG. 3 .
  • the radius of curvature RB of the face bulge is increased.
  • the radius of curvature RB is set in a range of not less than 15 inches, more preferably not less than 17 inches, still more preferably not less than 20 inches, but not more than 50 inches, more preferably not more than 45 inches, still more preferably not more than 40 inches.
  • the overall area of the club head is preferably set in a range of not less than 115 sq ⁇ cm, more preferably not less than 117 sq ⁇ cm, still more preferably not less than 120 sq ⁇ cm.
  • the projected area of the head on the horizontal plane HP is so limited.
  • the projected area is preferably not more than 140 sq ⁇ cm, more preferably not more than 137 sq ⁇ cm, still more preferably not more than 135 sq ⁇ cm.
  • Wood-type hollow golf club heads were prepared and tested for the carry distance and the directional stability of the struck ball. All of the club heads had same structures and same specifications except for the specifications shown in Table 1. The volume, mass, lie angle and loft angle of the heads were 460 cc, 195 grams, 59 degrees and 11.5 degrees, respectively.
  • the heads were each made from a main part formed by casting a molten titanium alloy Ti-6Al-4V, a face plate formed by forging a titanium alloy Ti-5.5Al-1Fe, and a crown plate formed by forging a titanium alloy Ti-15V-3Cr-3Al-3sn.
  • the main part was provided with a front opening and a top opening.
  • the face plate and crown plate were laser welded to the main part so as to cover the front opening and the top opening, respectively.
  • the moments of inertia Ma and Mb were adjusted by changing the wall thicknesses of the sole portion, side portion and/or crown portion.
  • Each head was attached to an FRP shaft (MP400, flex R, manufactured by SRI Sports Limited) to make a wood club.
  • FRP shaft MP400, flex R, manufactured by SRI Sports Limited
  • the club was mounted on a swing robot and hit three-piece balls five times par each of the following three positions at a head speed of 40 m/s.
  • each of ten golfers having handicaps of 10 to 20 hit three-piece balls ten times par a club.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Golf Clubs (AREA)
US12/230,611 2007-09-14 2008-09-02 Golf club head Abandoned US20090075752A1 (en)

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JP2007239679A JP2009066293A (ja) 2007-09-14 2007-09-14 ゴルフクラブヘッド
JP2007-239679 2007-09-14

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8012038B1 (en) * 2008-12-11 2011-09-06 Taylor Made Golf Company, Inc. Golf club head
US20130324296A1 (en) * 2012-05-30 2013-12-05 Bridgestone Sports Co., Ltd. Golf club head
US20190009142A1 (en) * 2017-07-06 2019-01-10 Sumitomo Rubber Industries, Ltd. Golf club set and golf club
CN113842617A (zh) * 2020-06-10 2021-12-28 雅马哈株式会社 高尔夫球杆头和高尔夫球杆
WO2022047080A1 (en) * 2020-08-26 2022-03-03 Karsten Manufacturing Corporation Club head having balanced impact and swing performance characteristics

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5715520B2 (ja) * 2011-07-28 2015-05-07 ダンロップスポーツ株式会社 ゴルフクラブヘッド及びその評価方法
JP6307696B1 (ja) * 2017-07-11 2018-04-11 住友ゴム工業株式会社 ゴルフクラブヘッド
JP6354922B1 (ja) * 2018-03-05 2018-07-11 株式会社プロギア ゴルフクラブヘッド

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US5573467A (en) * 1995-05-09 1996-11-12 Acushnet Company Golf club and set of golf clubs
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US6491592B2 (en) * 1999-11-01 2002-12-10 Callaway Golf Company Multiple material golf club head
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US6669579B2 (en) * 2000-03-14 2003-12-30 Callaway Golf Company Golf club head having a striking face with improved impact efficiency
US6679786B2 (en) * 2001-01-18 2004-01-20 Acushnet Company Golf club head construction
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US20030032500A1 (en) * 2001-08-03 2003-02-13 Norihiko Nakahara Golf club head
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US6929566B2 (en) * 2003-01-15 2005-08-16 Sri Sports Limited Golf club head and method of manufacturing the same
US7445564B2 (en) * 2004-03-30 2008-11-04 Daiwa Seiko, Inc. Golf club head
US20060148587A1 (en) * 2005-01-03 2006-07-06 Callaway Golf Company Golf Club Head
US7377861B2 (en) * 2005-08-23 2008-05-27 Bridgestone Sports Co., Ltd. Golf club head
US7513835B2 (en) * 2005-11-23 2009-04-07 Peter Angelo Belmont Golf club heads
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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10881918B2 (en) 2008-12-11 2021-01-05 Taylor Made Golf Company, Inc. Golf club head
US8157671B1 (en) 2008-12-11 2012-04-17 Taylor Made Golf Company, Inc. Golf club head
US8353782B1 (en) 2008-12-11 2013-01-15 Taylor Made Golf Company, Inc. Golf club head
US8579722B1 (en) 2008-12-11 2013-11-12 Taylor Made Golf Company, Inc. Golf club head
US11712608B2 (en) 2008-12-11 2023-08-01 Taylor Made Golf Company, Inc. Golf club head
US8012038B1 (en) * 2008-12-11 2011-09-06 Taylor Made Golf Company, Inc. Golf club head
US9387371B1 (en) 2008-12-11 2016-07-12 Taylor Made Golf Company, Inc. Golf club head
US9993700B2 (en) 2008-12-11 2018-06-12 Taylor Made Golf Company, Inc. Golf club head
US11173357B2 (en) 2008-12-11 2021-11-16 Taylor Made Golf Company, Inc. Golf club head
US10486038B2 (en) 2008-12-11 2019-11-26 Taylor Made Golf Company, Inc. Golf club head
US10507365B2 (en) 2008-12-11 2019-12-17 Taylor Made Golf Company, Inc. Golf club head
US10857429B2 (en) 2008-12-11 2020-12-08 Taylor Made Golf Company, Inc. Golf club head
US8888608B2 (en) * 2012-05-30 2014-11-18 Bridgestone Sports Co., Ltd. Golf club head
US20130324296A1 (en) * 2012-05-30 2013-12-05 Bridgestone Sports Co., Ltd. Golf club head
US20190009142A1 (en) * 2017-07-06 2019-01-10 Sumitomo Rubber Industries, Ltd. Golf club set and golf club
CN113842617A (zh) * 2020-06-10 2021-12-28 雅马哈株式会社 高尔夫球杆头和高尔夫球杆
WO2022047080A1 (en) * 2020-08-26 2022-03-03 Karsten Manufacturing Corporation Club head having balanced impact and swing performance characteristics
US20220118322A1 (en) * 2020-08-26 2022-04-21 Karsten Manufacturing Corporation Club head having balanced impact and swing performance characteristics
GB2613123A (en) * 2020-08-26 2023-05-24 Karsten Mfg Corp Club head having balanced impact and swing performance characteristics
EP4204108A4 (en) * 2020-08-26 2024-10-09 Karsten Mfg Corp CLUBTLE HEAD WITH BALANCED HIT AND SWING PERFORMANCE CHARACTERISTICS

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