US20090017938A1 - Wood-type golf club head - Google Patents
Wood-type golf club head Download PDFInfo
- Publication number
- US20090017938A1 US20090017938A1 US12/216,455 US21645508A US2009017938A1 US 20090017938 A1 US20090017938 A1 US 20090017938A1 US 21645508 A US21645508 A US 21645508A US 2009017938 A1 US2009017938 A1 US 2009017938A1
- Authority
- US
- United States
- Prior art keywords
- face
- club head
- inertia
- head
- less
- 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
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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
- A63B53/0458—Heads with non-uniform thickness of the impact face plate
- A63B53/0462—Heads with non-uniform thickness of the impact face plate characterised by tapering thickness of the impact face plate
-
- 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
Definitions
- the present invention relates to a wood-type golf club head, more particularly to a club face having curvature specifically defined in relation to a moment of inertia of the head in order to achieve carry distance and steady directionality.
- Such variation of backspin can be reduced by a face roll because the face roll can lessen the vertical gear effect.
- 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. 8 , 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. Accordingly, the backspin of the ball is decreased in the case of an upper hitting position or increased in the case of a lower hitting position.
- the distance L 1 or L 2 becomes relatively small, and the moment is decreased accordingly. Therefore, the vertical gear effect is lessened, and the variation of backspin is also decreased.
- the face roll can increase the ball launch angle, therefore, a decrease in the ballistic height due to the above-explained decrease in the backspin can be compensated thereby.
- the face roll in the case of the lower hitting position, can decrease the ball launch angle, therefore, an increase in the ballistic height due to the above-explained increase in the backspin can be compensated thereby.
- an object of the present invention to provide a wood-type golf club head in which, although the vertical moment of inertia is large, the decrease in the carry distance due to the ball hitting position which is off the sweet spot upward or downward, can be lessened.
- a wood-type golf club head has a club face provided with a face roll of which radius of curvature Y (inch) satisfies:
- Ma is a vertical moment of inertia (g sq ⁇ cm) of the head around a horizontal axis extending through the center of gravity of the head in parallel with a toe-heel direction of the head.
- the standard state of the club head is such that the club head is set on a horizontal plane HP so that the axis CL of the clubshaft (not shown) is inclined at the lie angle (alpha) while keeping the axis CL on a vertical plane VP, 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 7 a can be used instead of the axis CL of the clubshaft.
- “Sweet spot SS” is the point of intersection between the club face 2 and a straight line N drawn normally to the club face 2 passing through the center of gravity G of the head.
- Back-and-forth direction is a direction parallel with the straight line N projected on the horizontal plane HP.
- Heel-and-toe direction is a direction parallel with the horizontal plane HP and perpendicular to the back-and-forth direction.
- up-and-down direction is a direction perpendicular to the horizontal plane HP.
- “Vertical moment of inertia Ma” is the moment of inertia of the head around a horizontal axis passing through the center of gravity G in parallel to the toe-heel direction of the head.
- “Lateral moment of inertia Mb” is the moment of inertia of the head around a vertical axis passing through the center of gravity G.
- “Face progression FP” is the horizontal distance of the leading edge Le of the club head 1 from the vertical plane VP including the club shaft center line CL, measured in a vertical plane including the sweet spot Ss and the center of gravity G as shown in FIG. 3 .
- “Edge” of the club face 2 if the edge ( 2 a , 2 b , 2 c and 2 d ) is unclear due to smooth change in the curvature of the club face 2 , a virtual edge line (Pe) which is 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 20 mm in the course from the center SS to the periphery of the club face is determined. Then, the virtual edge line is defined as a locus of the points Pe.
- wood-type golf club is meant for at least number 1 to 5 woods, and clubs comprising heads having similar shapes may be included.
- FIG. 1 is a front view of a wood-type golf club head according to the present invention.
- FIG. 2 is a top view thereof.
- FIG. 3 is a cross sectional view taken along line A-A in FIG. 2 .
- FIG. 4 is a cross sectional view of the face portion for explaining the face roll.
- FIG. 5 is a cross sectional view of the face portion for explaining the face bulge.
- FIGS. 6 and 7 are a front view and a cross sectional view of a face portion for explaining the edge of the club face.
- FIGS. 8 and 9 are cross sectional views for explaining a vertical gear effect.
- FIGS. 10 and 11 are cross sectional views for explaining a horizontal gear effect.
- wood-type golf club 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 which extends from a toe-side edge 2 c to a heel-side edge 2 d of the club face 2 through a back face BF of the club head; and a hosel portion 7 at the heel side end of the crown to be attached to an end of a club shaft (not shown) inserted into the shaft inserting hole 7 a .
- the club head 1 is provided with a hollow (i) and a shell structure with the thin wall.
- the club face 2 is provided with a face roll FR (a curvature from crown to sole) and a face bulge FB (a curvature from heel to toe). Further, the face 2 is provided with parallel score lines 9 extending straight in the toe-heel direction. The score lines 9 are fine grooves for creating a suitable friction between the face and ball at impact even in wet conditions so as to effectively prevent so called drop ball.
- fiber reinforced resins can be used as light weight materials to form a part of the club head 1 .
- the club head 1 is made of one or more metal materials only.
- Various metal materials for example, stainless alloys, maraging steels, pure titanium, titanium alloys, magnesium alloys, aluminum alloys and the like can be used.
- the use of metal materials having high specific tensile strength is desirable.
- titanium alloys for example, Ti-6Al-4V, Ti-15V-3Cr-3Al-3Sn, Ti-15Mo-5Zr-3Al, Ti-13V-11Cr-3Al and the like can be suitably used.
- the club head 1 can be manufactured by assembling two or more (usually up to 5 or 6) parts each prepared through a suitable process for example, casting, forging, pressure molding or the like.
- the head is for a number 1 wood.
- the volume of the club head 1 is preferably not less than 400 cc, more preferably not less than 420 cc, still more preferably not less than 440 cc in order to increase the moment of inertia and the depth of the center of gravity.
- the club head volume is preferably not more than 600 cc, more preferably not more than 500 cc. According to the golf rules, the club head volume is not more than 470 cc, thus the volume is set to be 460 cc or less as circumstances demand.
- the height h of the face 2 is set in a range of not less than 30 mm, preferably not less than 35 mm, more preferably not less than 40 mm, but not more than 70 mm, preferably not more than 65 mm, more preferably not more than 60 mm when measured between the upper edge 2 a and the lower edge 2 b in the vertical plane including the sweet spot as shown in FIG. 4 . If the height h is too small, it becomes difficult to hit the ball, and the impact resilience of the face is decreased to decrease the carry distance. If the height h is too large, there is a possibility that the position of the sweet spot SS becomes unfavorably high, and the carry distance is decreased.
- the width FW of the face 2 is preferably set in a range of not less than 90 mm, more preferably not less than 95 mm, still more preferably not less than 100 mm, but not more than 130 mm, more preferably not more than 127 mm, still more preferably not more than 125 mm when measured in the toe-heel direction between the toe-side edge 2 c and heel-side edge 2 d passing through the sweet spot SS as shown in FIG. 1 .
- the vertical moment of inertia Ma is set to be not less than 3000 (g sq ⁇ cm), preferably not less than 3200 (g sq ⁇ cm), more preferably not less than 3500 (g sq ⁇ cm), still more preferably not less than 3900 (g sq ⁇ cm).
- the vertical moment of inertia Ma is less than 3000 (g sq ⁇ cm), it becomes difficult to obtain these effects. If the vertical moment of inertia Ma is too large contrary, there is possibility that the club head weight unavoidably increases or the shape of the club head becomes peculiar. Therefore, the vertical moment of inertia Ma is preferably not more than 4500 (g sq ⁇ cm), more preferably not more than 4000 (g sq ⁇ cm).
- the ball launch angle becomes substantially equal to the angle of a normal line drawn to the club face 2 at the ball hitting position.
- the radius of curvature Y of the face roll FR is small, if the ball hitting position is off the sweet spot SS upward, then the launch angle becomes relatively large, when compared with the ball hitting position is the sweet spot SS. If the ball hitting position is off the sweet spot SS downward, then the launch angle becomes relatively small. In either event, the carry distance is decreased.
- the radius of curvature Y (inch) of the face roll FR is limited in relation to the vertical moment of inertia Ma (g sq ⁇ cm) as follows:
- the ratio (Ma/Y) is not more than 245, more preferably not more than 200, still more preferably not more than 195.
- the ratio (Ma/Y) is not less than 90, preferably not less than 110, more preferably not less than 130.
- the radius of curvature Y is preferably not less than 15 inches, more preferably not less than 16 inches, still more preferably not less than 20 inches.
- the radius of curvature Y may be infinitely great, it is preferred that the radius Y is not more than 100 inches, more preferably not more than 50 inches, still more preferably not more than 40 inches in order to slightly fix the ball launch angle at the upper and lower hits because, even in the club head having a large vertical moment of inertia Ma, slight vertical gear effect occurs.
- the lateral moment of inertia Mb is set in a range of not less than 4000 (g sq ⁇ cm), preferably not less than 4500 (g sq ⁇ cm), more preferably not less than 5000 (g sq ⁇ cm), still more preferably not less than 5200 (g sq ⁇ cm).
- the lateral moment of inertia Mb is preferably not more than 8000 (g sq ⁇ cm), more preferably not more than 6000 (g sq ⁇ cm).
- the club head 1 In the case that the ball hitting position is off the sweet spot SS towards the toe, as shown in FIG. 10 (illustrating a right-handed case), the club head 1 is rotated clockwise around the center of gravity G, and a counterclockwise sidespin is given to the ball (b). On the other hand, in the case that the ball hitting position is off the sweet spot SS towards the heel, the club head 1 is rotated counterclockwise around the center of gravity G, and a clockwise sidespin is given to the ball (b). Such phenomenon is known as horizontal gear effect.
- the ball hitting position is off the sweet spot SS toward the toe (toe-side hitting)
- the ball is launched rightward at an angle ⁇ t with respect to the target trajectory j, and due to the sidespin (hook spin), the ball returns towards the target trajectory j.
- the ball hitting position is off the sweet spot SS toward the heel (heel-side hitting)
- the ball is launched leftward at an angle ⁇ h with respect to the target trajectory j, and due to the sidespin (slice spin), the ball returns towards the target trajectory j.
- the deterioration of the directionality is reduced.
- the face bulge FB is provided with a radius of curvature X (inch) satisfying
- Mb is the above-mentioned lateral moment of inertia in g sq ⁇ cm.
- the ratio (Mb/x) is not more than 325, more preferably not more than 260, but not less than 50, more preferably not less than 100, still more preferably not less than 130.
- the horizontal launch angle ⁇ t or ⁇ h at the time of toe-side or heel-side hitting is optimized and the deterioration of the directionality can be prevented. If the ratio (Mb/X) is less than 350, hook tendency and slice tendency become noticeable at the time of toe-side hitting and heel-side hitting, respectively.
- the numerical value of the radius of curvature X of the face bulge FB is preferably not less than 15 inches, more preferably not less than 16 inches, still more preferably not less than 20 inches. If the radius X is less than 15 inches, the above-mentioned advantageous effect tends to decrease. Although the radius of curvature X may be infinitely great, it is preferred that the radius X is not more than 100 inches, more preferably not more than 50 inches, still more preferably not more than 40 inches, so that the ball is launched at a small horizontal launch angle at the time of toe-side or heel-side hitting because, even in the club head having a large lateral moment of inertia Mb, slight horizontal gear effect occurs.
- the vertical moment of inertia Ma is less than the lateral moment of inertia Mb.
- the vertical gear effect comes out stronger than the horizontal gear effect. Therefore, it is desirable to make the radius of curvature Y of the face-roll FR less than the radius of curvature X of the face bulge FB in order to lessen the difference between the vertical and horizontal gear effects.
- the radius ratio (X/Y) is not less than 1.2, more preferably not less than 1.5.
- the radius ratio (X/Y) is not more than 3.5, more preferably not more than 3.0.
- the face roll FR and face bulge FB extend over the almost entirety of the club face 2 .
- the center of the radius of curvature Y is positioned backwardly far from the center of gravity G.
- the center of the radius of curvature X is positioned backwardly far from the center of gravity G of the head.
- the radius of curvature Y is a single radius.
- the horizontal plane including the sweet spot SS as shown in FIG.
- the radius of curvature X is a single radius.
- the radius Y or X may be varied as far as the above-mentioned limitations are satisfied.
- the face progression FP is increased to at least 20 mm, preferably not less than 21 mm as shown in FIG. 3 .
- the center line CL of the shaft axis is relatively shifted toward the backward of the club face. Namely, without decreasing the lateral moment of inertia Mb and the depth GL 2 of the center of gravity G, the center line CL of the shaft axis approaches the center of gravity G, and the moment of inertia Mc of the head around the center line CL is decreased.
- the face progression FP is preferably not more than 25 mm, more preferably not more than 24 mm, still more preferably not more than 23 mm.
- Wood-type hollow metal heads were prepared and tested for carry distance and directionality.
- Each of the club heads was composed of:
- a hollow main body formed by casting a titanium alloy Ti-6Al-4V and provided with an opening in the crown portion; a tungsten-alloy weight fixed to the inside of the main body by the use of an epoxide resin adhesive; and a crown plate formed by forging a titanium alloy Ti-15V-3Cr-3Sn and fixed to main body by laser-welding so as to cover the opening.
- the specifications common to all of the heads are as follows:
- Thickness of the crown portion 0.4 mm
- Thickness of the face portion is the thickness of the face portion
- Each of the club heads was attached to a FRP shaft (“MP400” manufactured by SRI Sports Limited, flex R, mass 48 grams) to make a number 1 wood, and the wood club was mounted on a swing robot. Then, the each head hit three-piece balls (SRIXON Z-UR, manufactured by SRI Sports Limited) six times par each of the following five hitting positions to obtain the average carry distance of the six shots.
- the head speed was 45 meter/second.
- Toe-side 10 mm toe-side of SS
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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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007183446A JP5074841B2 (ja) | 2007-07-12 | 2007-07-12 | ウッド型ゴルフクラブヘッド |
JP2007-183446 | 2007-07-12 |
Publications (1)
Publication Number | Publication Date |
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US20090017938A1 true US20090017938A1 (en) | 2009-01-15 |
Family
ID=40253621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/216,455 Abandoned US20090017938A1 (en) | 2007-07-12 | 2008-07-03 | Wood-type golf club head |
Country Status (2)
Country | Link |
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US (1) | US20090017938A1 (ja) |
JP (1) | JP5074841B2 (ja) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090156329A1 (en) * | 2006-10-25 | 2009-06-18 | Noah De La Cruz | Golf club with optimum moments of inertia in the vertical and hosel axes |
US20100216570A1 (en) * | 2007-09-27 | 2010-08-26 | Taylor Made Golf Company, Inc. | Golf club head |
US20100273572A1 (en) * | 2007-09-27 | 2010-10-28 | Taylor Made Golf Company, Inc. | Golf club |
US20110105243A1 (en) * | 2009-11-04 | 2011-05-05 | Sri Sports Limited | Golf club head |
CN103041555A (zh) * | 2011-10-12 | 2013-04-17 | 邓禄普体育用品株式会社 | 高尔夫球杆 |
US20160354652A1 (en) * | 2015-06-02 | 2016-12-08 | Bridgestone Sports Co., Ltd. | Manufacturing method, golf club head, and design method |
JP2017018726A (ja) * | 2016-10-31 | 2017-01-26 | ダンロップスポーツ株式会社 | ゴルフクラブヘッド |
US20210268346A1 (en) * | 2020-02-28 | 2021-09-02 | Sumitomo Rubber Industries, Ltd. | Golf club head |
US20220072399A1 (en) * | 2020-09-10 | 2022-03-10 | Karsten Manufacturing Corporation | Fairway wood golf club head with low cg |
US11975247B2 (en) | 2016-09-13 | 2024-05-07 | Taylor Made Golf Company, Inc. | Golf club head and golf club |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011212102A (ja) * | 2010-03-31 | 2011-10-27 | Mrc Composite Products Co Ltd | ゴルフクラブヘッド |
JP2021194120A (ja) | 2020-06-10 | 2021-12-27 | ヤマハ株式会社 | ゴルフクラブヘッド及びゴルフクラブ |
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JP2009018049A (ja) | 2009-01-29 |
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