EP1108448B1 - Golf club head, golf club, and golf club set - Google Patents

Golf club head, golf club, and golf club set Download PDF

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Publication number
EP1108448B1
EP1108448B1 EP00929855A EP00929855A EP1108448B1 EP 1108448 B1 EP1108448 B1 EP 1108448B1 EP 00929855 A EP00929855 A EP 00929855A EP 00929855 A EP00929855 A EP 00929855A EP 1108448 B1 EP1108448 B1 EP 1108448B1
Authority
EP
European Patent Office
Prior art keywords
golf club
club head
sectional area
iron
wood
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.)
Expired - Lifetime
Application number
EP00929855A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1108448A1 (en
EP1108448A4 (en
Inventor
Mototaka Iwata
Koji Sakai
Hiroshi Nagao
Takashi Kimura
Masahiro Mizobata
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.)
Mizuno Corp
Original Assignee
Mizuno Corp
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 Mizuno Corp filed Critical Mizuno Corp
Publication of EP1108448A1 publication Critical patent/EP1108448A1/en
Publication of EP1108448A4 publication Critical patent/EP1108448A4/en
Application granted granted Critical
Publication of EP1108448B1 publication Critical patent/EP1108448B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • A63B53/005—Club sets
    • 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
    • A63B53/0466—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
    • A63B53/047—Heads iron-type
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • 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
    • A63B2053/0491—Heads with added weights, e.g. changeable, replaceable

Definitions

  • the present invention relates to a golf club head, a golf club and a golf club set.
  • a golf club head, a golf club and a golf club set efficiently reducing dispersion of carries resulting from dispersion of hitting positions.
  • Japanese Patent Laying-Open No. 9-149954 or Japanese Patent Laying-Open No. 10-248969 there is disclosed a technique of setting an angle at the time of projecting a principal axis of inertia on a plane perpendicular to a plane including a carrying line and a horizontal plane in the vicinity of a dispersion direction of hitting positions of a golfer thereby suppressing dispersion of carries.
  • Japanese Patent Laying-Open No. 5-57034 merely discloses means of enlarging the momental ellipsoid by adding the weight on the axis without changing the direction of the principal axis of inertia previously possessed by the produced head. In the aforementioned gazette, therefore, no judgment is made as to whether or not the direction of the principal axis of inertia is desirable in the first place when taking the performance of the golf club into consideration.
  • WO 92/15374 discloses a golf club head according to the preamble of claim 1.
  • the present invention has been proposed in order to solve the aforementioned problem, and aims at providing a golf club head, a golf club and a golf club set in which fluctuation of a carry and a flying direction of a ball is small also when a hitting position fluctuates.
  • the present invention is to provide a golf club head more efficiently suppressing dispersion of a carry and a ball hitting direction with respect to dispersion of a hitting position by three-dimensionally designing arrangement of a principal axis of inertia desirable for a golf club, which is not disclosed in the prior art.
  • a momental ellipsoid 10 three-dimensionally exists as shown in Fig. 1A and Fig. 1B.
  • a wood golf club 70 has a golf club head 1 for a wood and a shaft 60 whose one end is connected to the golf club head 11.
  • the golf club head 1 has a face plane 11.
  • the momental ellipsoid 10 of the golf club head 1 has principal axes I 1 , I 2 and I 3 of inertia. These principal axes of inertia intersect at the center G of gravity as the origin.
  • an iron golf club 170 has a golf club head 101 for an iron and a shaft 160 whose one end is connected to the golf club head 101.
  • the golf club head 101 has a face plane 111.
  • a momental ellipsoid 110 of the golf club head 101 has principal axes I 1 , I 2 and I 3 of inertia. These principal axes of inertia intersect at the center G of gravity as the origin.
  • the length of a principal axis is generally expressed by the inverse of the square root of the magnitude of the moment of inertia about the axis.
  • a load generated when hitting a ball with a golf club is shown by a vector F in Fig. 2.
  • This vector F can be decomposed into a vector FP perpendicular to a face plane 11 and a small vector FH parallel to the face plane 11. Dispersion of a carry and a flying direction results from unnecessary rotary motion of a golf club head 1 shown by arrow 12. It is understood that, in most of the moment generating this rotary motion, the vector FP perpendicular to the face plane 11 is the main component from its magnitude, and the vector FH parallel to the face plane 11 is a small component and is at an ignorable degree.
  • a load going to rotate the golf club head 1 is applied from the direction perpendicular to the face plane 11, and the face plane 11 may be designed to cut the momental ellipsoid along a plane parallel to the face plane 11 and passing through the center of the momental ellipsoid so that the sectional area (hereinafter referred to as an effective sectional area) is as small as possible in order to enlarge inertial resistance of the golf club head 1 against this load.
  • golf club heads include such a one that a face plane 11 is convexed as a general wood golf club head, a plane located in the vicinity of the center (centroid) of the face plane is defined as the face plane in this case.
  • a plane in contact with the face centroid, a sweet spot or a point on the face plane most having distance with respect to a plane including the outer periphery of the face plane is the face plane.
  • Each point is located in the vicinity of the centroid, and hence there is no large difference with whichever one the reference plane is in contact.
  • an axis perpendicular to the ground and passing through the center G of gravity is a Z axis
  • an axis parallel to an intersection line between a contact surface at the centroid (center of the face plane 11) of the face plane 11 and the ground, perpendicular to the Z axis and passing through the center G of gravity is an X axis.
  • An axis perpendicular to both of the X axis and the Z axis and passing through the center G of gravity is a Y axis.
  • f 1 (l 1 , m 1 , n 1 ) T f ⁇ Z(0, 0, 1)
  • ⁇ denotes cross products.
  • this cutting plane expresses the magnitude of inertial resistance indicating easiness of rotation on this plane, and the cutting plane expresses inertial resistance of the plane in the perpendicular direction. Further, it is obvious that the shape of this cutting plane becomes a plane ellipse since it is a cutting plane of a momental ellipsoid and a plane of a solid, as shown in Figs. 6, 7 and 8.
  • I 1 , I 2 and I 3 are moments of inertia in relation to the X, Y and Z axes
  • I 12 is a product of inertia in relation to the YZ plane and the XZ plane
  • I 23 is a product of inertia in relation to the XZ plane and the XY plane
  • I 1 ⁇ X 2 + I 2 ⁇ Y 2 + I 3 ⁇ Z 2 + 2 ⁇ I 12 ⁇ X ⁇ Y ⁇ + 2 ⁇ I 13 ⁇ X ⁇ Z + 2 ⁇ I 23 ⁇ Y ⁇ Z 1
  • the current area is the effective sectional area.
  • the effective sectional area of the momental ellipsoid cut along the plane parallel to the face plane 11 and passing through the center of the momental ellipsoid expresses the magnitude of inertial resistance of the body against the load perpendicularly acting on the plane, as described above.
  • the inertial resistance enlarges as this effective sectional area is small. Therefore, it is possible to provide a head whose carry and direction are stable by designing it to reduce the effective sectional area to the utmost.
  • a golf club set according to claim 13 comprises an iron golf club and a wood golf club according to claim 1.
  • a golf club set according to claim 14 comprises a plurality of golf clubs having a golf club head according to claim 1.
  • This golf club set is applied to any of that formed by wood golf clubs, that formed by iron golf clubs and that formed by wood and iron golf clubs.
  • a golf club set according to claim 15 comprises a wood golf club and an iron golf club according to claim 1.
  • Fig. 1A and Fig. 1B are diagrams typically showing principal axes of inertia of a wood golf club head.
  • Fig. 2 is a diagram decomposing force and a moment generated when hitting a ball into a component of force horizontal to a face and a vertical component of force.
  • Fig. 3 is a conceptual diagram showing basic axes of the coordinates of momental ellipsoid systems.
  • Fig. 4 is a model diagram for illustrating a cutting elliptic plane and coordinate transformation.
  • Fig. 5 is a model diagram showing an axis parallel to an intersection line of a contact surface at the centroid of a face plane and the ground and passing through the center of gravity as an ⁇ axis, an axis parallel to the plane and perpendicular to the ⁇ axis as a ⁇ axis and an axis perpendicular to the ⁇ axis and the ⁇ axis as a ⁇ axis.
  • Fig. 6 is a diagram showing a surface cut along a plane passing through the center of gravity of a momental ellipsoid and parallel to a face plane.
  • Fig. 7 is a diagram showing the surface cut along the plane passing through the center of gravity of the momental ellipsoid and parallel to the face plane.
  • Fig. 8 is a diagram showing the surface cut along the plane passing through the center of gravity of the momental ellipsoid and parallel to the face plane.
  • Fig. 9 is a graph showing results of simulation of change of an effective sectional area/minimum area ratio in a driver head and a carry at the time of hitting a ball on a position displaced by 10 mm from a sweet spot in a toe direction.
  • Fig. 10 is a diagram showing an effective sectional area in a driver head and a carry at the time of hitting a ball on a position displaced by 10 mm from a sweet spot toward a toe side.
  • Fig. 11 is a model diagram of a golf club head employed when carrying out the test shown in Fig. 10.
  • Fig. 12 is a diagram typically showing principal axes of inertia of an iron golf club head.
  • the present invention is a momental ellipsoid of a golf club head, and assuming that three principal axes of the momental ellipsoid orthogonal to each other at the origin are an axis I 1 , an axis I 2 and an axis I3 in order of larger moments of inertia about those principal axes, the ratio (A/B) of a sectional area A (effective sectional area) at the time of cutting the momental ellipsoid along a plane passing through the origin and parallel to a face plane and a sectional area B (minimum sectional area) at the time of cutting the momental ellipsoid along a plane including the axis I 1 and the axis I 2 is at least 1 and not more than 1.4.
  • a main load rotating the golf club head perpendicularly acts on the face plane.
  • the magnitude of inertial resistance against the load perpendicularly acting on the face plane can be expressed by the effective sectional area A.
  • the resistance most enlarges against the load applied to the face plane when the effective sectional area of the momental ellipsoid is the minimum.
  • a carry is stabilized by suppressing the effective sectional area to not more than 1.4 times the minimum sectional area B.
  • Fig. 9 simulates the relation between change of an effective sectional area/minimum area ratio of a momental ellipsoid and a carry at the time of continuously changing the axis I 3 in a toe-heel direction and hitting a ball on a position displaced by 10 mm from a sweet spot toward the toe side.
  • the effective sectional area/minimum area ratio exceeds 1.4.
  • the effective sectional area/minimum area ratio may be set to not more than 1.4.
  • a golf club set can be structured employing the aforementioned golf club heads.
  • the effective sectional area/minimum area ratio varies with the head, and the difference in a golf club head for a wood and a golf club head for an iron is particularly large. It is said that the wood is a club of a carry and the iron is a club of directivity for this reason.
  • the ratio of the maximum inertial resistance possessed by the golf club heads and actually possessed inertial resistance becomes constant and hence it is possible to make it a golf club set whose carries are stable.
  • a feeling for carry stability in the golf club set more coincides by setting the value of the effective sectional area/minimum area ratio constant or within the range of ⁇ 0.1 at the maximum in the golf club set.
  • the golf club head according to the present invention is such a golf club head that the effective sectional area A is at least 0.0005 (1/g ⁇ cm 2 ) and not more than 0.0025 (1/g ⁇ cm 2 ).
  • the value of the effective sectional area varies with inclination of the principal axes of the momental ellipsoid or the shape of the momental ellipsoid. If this value is large, inertial resistance reduces regardless of the ratio to the minimum sectional area and it becomes a head having no carry stability. Therefore, the effective sectional area A is preferably set to at least 0.0005 (1/g ⁇ cm 2 ) and not more than 0.0025 (1/g ⁇ cm 2 ).
  • the effective sectional area A is preferably set to at least 0.0005 (1/g ⁇ cm 2 ) and not more than 0.002 (1/g ⁇ cm 2 ).
  • the golf club head is such a golf club head that the effective sectional area A becomes at least 0.0005 (1/g ⁇ cm 2 ) and not more than 0.00125 (1/g ⁇ cm 2 ).
  • Fig. 10 shows carry change at the time of making a hit with displacement by 10 mm from a sweet spot toward a toe side when changing the effective sectional area of a driver head. This test was adjusted by preparing heads lighter than prescribed mass as shown in Fig. 11 and arranging equal weights on positions symmetrical about the center G of gravity thereof so that the center of gravity positions and the weights of the golf club heads remain unchanged while only inclination of principal axes of inertia change.
  • a solid line 50 shows a principal axis I 3 of inertia of a general club head.
  • a dotted line 51 shows a principal axis I 3 of inertia of a first golf club head.
  • a dotted line 52 shows a principal axis I 3 of inertia of a second golf club head.
  • the first golf club head has weight members 53 and 54.
  • the second golf club head has weight members 55 and 56.
  • test hitting was made with a robot at a head speed of 40 ms. Also as to the others, the head speed was set to 40 m/s.
  • a broken line approximates actually measured data with a polynominal and couples the same with virtual lines. It is understood from this data that there is a plateau-shaped peak in the vicinity of the effective sectional area A of 0.00125. Further, it is understood that the carry abruptly lowers from a portion where the effective sectional area A exceeds 0.0025.
  • the effective sectional area A is preferably set to not more than 0.002 (1/g ⁇ cm 2 ), desirably not more than 0.00125 (1/g ⁇ cm 2 ).
  • the golf club head according to the present invention is such a golf club head that a value obtained by dividing the effective sectional area A by the area of the face plane is not more than 1.00 ⁇ 10 -4 (1/g ⁇ cm 4 ).
  • Performance as a club does not improve when dispersion of hitting points enlarges also when reducing the momental ellipsoid, and hence some limitation must be provided. Therefore, it is possible to balance both by rendering the range of the ratio of the area of the face correlated with the dispersion of hitting points and the effective sectional area not more than 1.00 ⁇ 10 -4 (1/g ⁇ cm 4 ).
  • a golfer has such a regular hitting area that the quantity of dispersion of hitting points varies with the magnitude of the face area.
  • the face area reduces as the count enlarges in a golf club head for a wood, while it is possible to provide a club easy to handle in which a feeling with the regular hitting area possessed by the golfer is coincident by rendering the ratio of the face area and the effective sectional area constant.
  • a value obtained by dividing the effective sectional area A by the volume of the golf club head is not more than 1.50 x 10 -5 (1/g ⁇ cm 5 ).
  • a golf club particularly a golf club head for a wood
  • it can be enlarged in the height, length and width directions of the head.
  • the shape of the momental ellipsoid varies with the enlarging direction, and the value of the effective sectional area also changes.
  • the value obtained by dividing the effective sectional area A by the volume of the head is desirably set to not more than 1.50 x 10 -5 (1/g ⁇ cm 5 ).
  • a golfer empirically feels that a head having a large volume has large inertial resistance and that having a small head volume has small inertial resistance. Therefore, it is needless to say that a club set matching with the golfer's feeling can be provided when regularizing the ratio of the head volume and the effective sectional area constant.
  • a value obtained by dividing the effective sectional area A by the mass of the golf club head is not more than 1.00 ⁇ 10 -5 (1/g 2 ⁇ cm 2 ).
  • the mass of the golf club head is subjected to restriction in design of the golf club, and hence it is possible to make it a head having small dispersion of carries as the ratio of contribution to the effective sectional area per unit mass is high whether to increase the volume or to change mass distribution. As this value, it is desirable to render the same not more than 1.00 ⁇ 10 -5 (1/g 2 ⁇ cm 2 ).
  • the effective sectional area When making it a golf club for a wood, it is desirable to set the effective sectional area to at least 0.0005 (1/g ⁇ cm 2 ) and not more than 0.0020 (1/g ⁇ cm2). In this case, it is possible to bring out the characteristics of the golf club for a wood and make it a head having small dispersion of carries resulting from dispersion of hitting positions.
  • the golf club head according to the present invention By applying the golf club head according to the present invention to all clubs in a golf club set for woods, it is possible to homogenize the characteristics of the clubs in the set and structure a golf club set for woods whose hit feelings are unified.
  • loft angles are preferably not more than 16°.
  • the golfer When demanding a carry, further, the golfer generally employs a loft angle of not more than 16°.
  • a golf head for a wood whose loft angle is not more than 16° at the minimum a club whose carry stability is high may be provided. While the golf club head for a wood has heretofore been mainly described, numerical values in individual characteristics vary with various factors including shapes in a wood and an iron. While the description hereinafter shows optimum values in a golf club head for an iron, effects thereof follow those in the golf club head for a wood.
  • the golf club head for an iron according to the present invention is such that the effective sectional area A is at least 0.001 (1/g ⁇ cm2) and not more than 0.0025 (1/g ⁇ cm 2 ).
  • a value obtained by dividing the effective sectional area A by the volume of the golf club head is not more than 7.80 ⁇ 10 -5 (1/g ⁇ cm 5 ).
  • a value obtained by dividing the effective sectional area A by the mass of the golf club head is not more than 1.10 ⁇ 10 -5 (1/g 2 ⁇ cm 2 ).
  • the loft angle of the golf club is 16°.
  • the golf club head according to the present invention is designed to reduce the area of a plane ellipse at the time of expressing the moment of inertia important as a characteristic of the club head by a momental ellipsoid about the center of gravity and cutting the momental ellipsoid along a virtual plane parallel to the face plane and passing through the center of gravity of the golf club head.
  • it is possible to enlarge inertial resistance of the golf club head with respect to the hitting direction and efficiently reduce dispersion of carries resulting from dispersion of hitting positions.
  • the present invention can be utilized for a golf club head, a golf club and a golf club set.

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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)
EP00929855A 1999-06-25 2000-05-24 Golf club head, golf club, and golf club set Expired - Lifetime EP1108448B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP18029899 1999-06-25
JP18029899A JP3592961B2 (ja) 1999-06-25 1999-06-25 ゴルフクラブヘッド、ゴルフクラブおよびゴルフクラブセット
PCT/JP2000/003335 WO2001000282A1 (fr) 1999-06-25 2000-05-24 Tete de canne de golf, canne de golf et ensemble de cannes de golf

Publications (3)

Publication Number Publication Date
EP1108448A1 EP1108448A1 (en) 2001-06-20
EP1108448A4 EP1108448A4 (en) 2001-09-26
EP1108448B1 true EP1108448B1 (en) 2003-09-17

Family

ID=16080771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00929855A Expired - Lifetime EP1108448B1 (en) 1999-06-25 2000-05-24 Golf club head, golf club, and golf club set

Country Status (7)

Country Link
EP (1) EP1108448B1 (ja)
JP (1) JP3592961B2 (ja)
CN (1) CN1315879A (ja)
CA (1) CA2341523A1 (ja)
DE (1) DE60005282T2 (ja)
TW (1) TW455497B (ja)
WO (1) WO2001000282A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5087328B2 (ja) * 2007-06-29 2012-12-05 ダンロップスポーツ株式会社 ウッド型ゴルフクラブヘッド
JP5345486B2 (ja) * 2009-09-15 2013-11-20 ブリヂストンスポーツ株式会社 ゴルフクラブヘッド及び設計方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2542523B2 (ja) * 1988-05-31 1996-10-09 ヤマハ株式会社 ゴルフ用ウッドクラブヘッド
WO1992015374A1 (en) * 1991-03-01 1992-09-17 Sanders Gregory L System for adjusting a golf club
JPH0557035A (ja) * 1991-08-31 1993-03-09 Maruman Golf Corp 慣性主軸方向にフエースラウンドを設けたゴルフクラブヘツド
JP2719695B2 (ja) 1991-08-31 1998-02-25 マルマンゴルフ株式会社 慣性主軸方向に重量配分させたゴルフクラブヘッド
US5366223A (en) * 1993-10-28 1994-11-22 Frank D. Werner Golf club face for drivers
JP3063967B2 (ja) * 1995-09-25 2000-07-12 住友ゴム工業株式会社 ゴルフクラブヘッド
US6186905B1 (en) * 1997-01-22 2001-02-13 Callaway Golf Company Methods for designing golf club heads
JP3174528B2 (ja) 1997-03-13 2001-06-11 住友ゴム工業株式会社 ゴルフクラブヘッド

Also Published As

Publication number Publication date
DE60005282D1 (de) 2003-10-23
TW455497B (en) 2001-09-21
CA2341523A1 (en) 2001-01-04
WO2001000282A1 (fr) 2001-01-04
DE60005282T2 (de) 2004-07-08
CN1315879A (zh) 2001-10-03
JP3592961B2 (ja) 2004-11-24
EP1108448A1 (en) 2001-06-20
JP2001000596A (ja) 2001-01-09
EP1108448A4 (en) 2001-09-26

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