WO2001030455A2 - Golf ball dimple structures with vortex generators - Google Patents
Golf ball dimple structures with vortex generators Download PDFInfo
- Publication number
- WO2001030455A2 WO2001030455A2 PCT/US2000/041475 US0041475W WO0130455A2 WO 2001030455 A2 WO2001030455 A2 WO 2001030455A2 US 0041475 W US0041475 W US 0041475W WO 0130455 A2 WO0130455 A2 WO 0130455A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- golf ball
- dimple
- concave
- dimples
- polygon
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
- A63B37/0006—Arrangement or layout of dimples
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
- A63B37/0012—Dimple profile, i.e. cross-sectional view
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
- A63B37/002—Specified dimple diameter
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0077—Physical properties
- A63B37/0089—Coefficient of drag
Definitions
- the present invention relates to golf balls, and. more particularly, to golf ball dimples.
- FIGS. 1 -4 labeled as prior art, which consider the flow of air or fluid over the surface of a portion of a golf ball 20.
- FIG. 1 shows the cross section of a typical, spherically concave golf ball dimple 22 which would be on the surface of the golf ball 20.
- air 24 passes slowly over the dimple 22 of FIG. 1 in the direction as indicated by the arrows.
- the air 24 conforms to the shape of the dimple 22 at its surface and has insufficient velocity or direction change to create turbulence or vortices.
- FIG. 3 is a view of the same dimple 22 with the air 24 passing over the surface at a high enough velocity such that the air 24 cannot conform to the shape of the dimple 22.
- FIG. 4 is a view of the same dimple 22 with the air 24 passing over the dimple at an intermediate velocity.
- the air 24 cannot perfectly conform to the surface of the dimple 22, but is in much greater contact than the air in FIG. 3 where the velocity is higher.
- the air 24 exits the dimple 22 its velocity is such that it soon re-conforms to the surface 26 of the golf ball 20. Since this is the case, a turbulent boundary layer cannot be maintained even though some turbulence is generated at the intersection of the trailing edge of the dimple and the surface of the sphere.
- the number, size, shape, and depth of the dimples all have an influence on the amount of distance improvement a dimpled golf ball will exhibit. Specifically, as the depth, diameter, and number of the dimples is gradually increased, the frictional drag of the ball is increased by the surface roughness of the dimples, and the aerodynamic drag is decreased.
- triangle- or hexagon-shaped dimples having sharp edges have been used on golf balls. While these sharp edges assist in generating vortices and turbulence, they are located at the surface of the sphere and are hence in the airflow during the entire flight of the ball. Their effect must therefore be regulated so as not to produce too much turbulence early on in the flight, making them ineffectual during later portions of the flight.
- U.S. Pat. No. 4,877,252 to Shaw discloses pairs of normal sized dimples 28, 30 that overlap by as much as twenty percent.
- a single projection 32 below the level of the golf ball surface 26 is formed where the two dimples 28, 30 overlap. Theoretically, during flight at intermediate velocities, air strikes the projection 32, further helping to create a turbulent boundary layer.
- the dimples 28, 30 overlap by no more than twenty percent, they form a large area on the surface of the golf ball whose width is at least 1.8 times the diameter of a single dimple. This can be seen by comparing the indicated diameter D of the dimple 22 in FIG.
- the overlapping dimples 28, 30 in FIG. 5 will behave approximately as two independent dimples with only a slight improvement in flight characteristics. This is because the projection 32 is so far from the edges of the dimples 28, 30 that the air passing over the golf ball during flight will still have a chance to conform to the shape of the dimples even at relatively high velocities, e.g., as shown in FIG. 4.
- United States Pat. No. 4,960,282 also to Shaw, discloses pairs or chains of dimples that preferably overlap one another by at least 0.02 inches (0.508 mm) or twenty percent. Although this disclosed structure potentially reduces the velocity at which a turbulent boundary layer is formed, it still does not provide enhanced flight characteristics at lower velocities. This is because the projection is still quite far from the edges of the dimples, and because the turbulent boundary layer producing effect of the overlapping pairs of dimples is highly directionally dependent. That is, with reference to FIG. 5, when air 24 flows in either of the directions indicated by the arrows, a turbulent boundary layer will potentially be formed, depending on the velocity of the golf ball 20 and the particular dimensions of the overlapping dimples. However, if the air flows along (instead of across) the projection 32 (e.g., normal to FIG. 5), no boundary layer effects will be produced.
- Another object is to provide golf ball dimples having a common cross- sectional structure wherein a turbulent boundary layer is formed at low. medium, and high velocities.
- the present invention discloses a plurality of vortex generating golf ball dimples for producing a turbulent boundary layer on the surface of the golf ball during a longer portion of the golf ball's flight, without unnecessarily increasing the size of the boundary layer in the early portions of the flight. This results in the golf ball traveling a longer distance.
- Each dimple is a composite of a plurality of overlapping smaller concave sections, with the dimple preferably being dimensioned to lie within a circumscribed circle having about the same diameter as a conventional dimple.
- the preferred embodiments of the dimple comprise a plurality of peripheral spherical sections overlapping a central spherical section to form a ridge-like polygon.
- the polygon, the top edge of which lies below the outer edges of the dimple acts as a vortex generating structure within the dimple con-cavity for producing the turbulent boundary layer.
- each pair of opposite or near opposite sides of the polygon has a common cross-sectional shape or structure.
- the aerodynamic characteristics of the cross-sectional structure are such that the turbulent boundary layer is formed about the dimple at even relatively low velocities. Also, because the cross-sectional structure is seen across the dimple from a plurality of orientations, the boundary layer producing effects of the dimple are directionally independent.
- the opposite or near opposite sides of the polygon act as spaced apart vortex generating projections extending up from the bottom of the dimple.
- air which can only slightly conform to the shape of the dimple, passes over the projections and only hits the trailing edge of the dimple, as in a conventional spherical dimple. This provides sufficient air vortices to create a turbulent boundary layer, without the projections unnecessarily and detrimentally contributing.
- the air conforms a bit more to the shape of the dimple, and vortices are created as the air encounters at least one of the projections.
- FIG. 1 is a cross-sectional view of a golf ball dimple according to the prior art
- FIG. 2 is a conceptual view of air flow over the dimple of FIG. 1 at a low velocity
- FIG. 3 is a conceptual view of air flow over the dimple of FIG. 1 at a high velocity
- FIG. 4 is a conceptual view of air flow over the dimple of FIG. 1 at an intermediate velocity
- FIG. 5 is a cross-sectional view of overlapping golf ball dimples according to the prior art
- FIG. 6 is a view of a cross-sectional structure common to a plurality of complex dimples of the present invention and as shown in FIGS. 10-13;
- FIG. 7 is a conceptual view of air flow over the cross-sectional structure of
- FIG. 6 at a high velocity
- FIG. 8 is a conceptual view of air flow over the cross-sectional structure of FIG. 6 at an intermediate velocity
- FIG. 9 is a conceptual view of air flow over the cross-sectional structure of FIG. 6 at a low velocity
- FIG. 10 is a top plan view of a first complex dimple having the cross- sectional structure shown in FIG. 6;
- FIG. 11 is a top plan view of a second complex dimple having the cross- sectional structure shown in FIG. 6;
- FIG. 12 is a top plan view of a third complex dimple having the cross- sectional structure shown in FIG. 6;
- FIG. 13 is a top plan view of a fourth complex dimple having the cross- sectional structure shown in FIG. 6;
- FIG. 14 is a perspective view of a golf ball incorporating the complex dimples shown in FIGS. 11 and 13.
- FIGS. 6-14 a preferred embodiment of a complex dimple cross-sectional structure 42 and complex dimples 40a-40d having the cross-sectional structure, according to the present invention, will now be given.
- a golf ball 20 e.g., as seen in FIG. 14
- the dimples 40a-40d exhibits superior driving length. This is because the dimples have unique aerodynamic features 42, 48, 56a-561, etc., as described below, that substantially improve and enhance the flight characteristics of the golf ball when it travels at low, medium, and high velocities after being struck by a golfer.
- FIGS. 10-13 Various complex dimples 40a-40d of the present invention are shown in FIGS. 10-13, respectively.
- complex it is meant that each dimple, as a result of being a composite of a plurality of smaller, spherically (or otherwise) shaped sections, has a vortex generating structure within the dimple concavity for producing a turbulent boundary layer.
- Each of the complex dimples 40a-40d has the cross-sectional structure 42 as shown in FIGS. 6-9.
- the aerodynamic characteristics of the cross-sectional structure 42 are such that a turbulent boundary layer is formed about the complex dimples 40a-40d at even relatively low velocities.
- the golf ball 20 provided with a plurality of the complex dimples 40a-40d will exhibit superior distance and flight characteristics.
- the complex dimples 40a-40d are similar in cross- section (from the perspective shown) to the spherical dimple 22 in FIG. 1, to the extent that they both have the same diameter D and define an at least partially spherical concavity.
- the cross-sectional structure 42 of the complex dimples 40a-40d includes first and second edged projections or "vortex generators" 44a, 44b extending upwards from the dimple bottom.
- FIG. 7 shows the effect of the vortex generators 44a, 44b on the flow of air 24 across one of the complex dimples 40a-40d at high velocities.
- the air 24 passes over the vortex generators 44a, 44b and collides with the rear wall of the dimple without being affected by the vortex generators.
- the dimple will perform essentially the same as the conventional spherical dimple 22 in FIG. 3.
- FIG. 8 shows the cross-sectional structure 42 of FIG. 6 with air 24 passing over the dimple at an intermediate velocity.
- the air 24 hits the first vortex generator 44a and must quickly change direction. This abrupt change generates turbulence which is then additive to the turbulence created by the trailing edge of the dimple. Hence, a turbulent boundary layer is maintained at this velocity.
- FIG. 9 shows the effect of air 24 passing over the vortex generators 44a, 44b at a low velocity.
- the air now strikes both of the vortex generators 44a, 44b at the bottom of the dimple.
- some turbulence is generated by the passage of the air 24 over the vortex generators 44a, 44b due to the air's necessary abrupt direction change.
- the top edges 46a, 46b of the vortex generators lie below the outer edge of the complex dimples 40a-40d. This is because a golf ball's velocity is constantly changing during flight, and the vortex generators are not needed in the early, high velocity portion of the flight. Note that if the vortex generators extended upwards as far as the outer edge of the dimple, frictional drag would be greatly increased without much additional benefit resulting from the stronger turbulent boundary layer.
- a first of the complex dimples 40a is shown in FIG. 10, and is the simplest construction available by which to provide the cross-sectional structure 42.
- the first dimple 40a is merely a spherical section 48 intersecting a toroidal section 50.
- vortex generators function best if their upper edges are substantially linear in nature rather than being arced. Therefore, the first complex dimple 40a, although functional in providing improved flight characteristics, is not preferred over the remaining complex dimples 40b-40d described herein.
- FIGS. 11-13 show second, third and fourth complex dimples 40b-40d. respectively.
- Each of these complex dimples comprises a plurality of spherical sections or concave walls which overlap in such a manner that the peripheral or outer sections 54a-541
- FIG. 11 shows the second complex dimple 40b created by the central spherical section 52a being intersected by three outer spherical sections 54a-54c.
- the three outer spherical sections 54a-54c are symmetrically arranged 120° apart from one another about the center point P of the central spherical section 52a. This results in three linear segments 56a-56c forming a triangle and three additional linear segments 58a-58c which project from the apices of the formed triangle to the intersection of two adjacent outer spherical sections.
- Any two adjacent linear segments of the triangle (56a-56b, 56b-56c, or 56c-56a) provide the preferred linear edges of the vortex generators.
- the linear segments 56a, 56b form the vortex generator edges 46a, 46b.
- FIG. 12 shows the third complex dimple 40c created by the central spherical section 52b being intersected by four peripheral spherical sections 54d-54g.
- the four outer spherical sections 54d-54g are symmetrically arranged 90° apart from one another about the center point P of the central spherical section 52b.
- Any two opposed linear segments of the square (56d-56e or 56f-56g) provide the preferred linear edges of the vortex generators and the requisite cross-sectional structure 42.
- two of the linear segments 56d, 56e form the vortex generator edges 46a, 46b.
- FIG. 13 shows the fourth complex dimple 40d created by the central spherical section 52c being intersected by five outer spherical sections 54h-541.
- the five outer spherical sections 54h-541 are symmetrically arranged 72° apart from one another about the center point P of the central spherical section 52c. This results in five linear segments 56h-561 forming a pentagon and five additional linear segments 58h-581 which project from the apices of the formed pentagon to the intersection of two adjacent outer spherical sections.
- Any two non-adjacent linear segments of the pentagon (e.g., 56h-56i, 56h-56k, 56J-561) provide the preferred linear edges of the vortex generators.
- two of the linear segments 56h, 56i form the vortex generator edges 46a, 46b.
- the length of the segments is dependent on the relationship of the radii of all of the spherical sections 52c, 54h-541, and again, in FIG. 13 all the spherical sections have equal radii for convenience.
- Each of the complex dimples 40a-40d is preferably the same overall size as a conventional dimple.
- the complex dimples should be dimensioned to be circumscribed by a circle having the same diameter as a conventional dimple, about 0.100 to 0.185 inches (2.540 to 4.699 mm), with the radii of the circles generated by the intersection of the spherical dimple sections with the sphere of the ball preferably being between about 0.025 to 0.047 inches (0.635 to 1.194 mm) in length. If the complex dimples are dimensioned much wider, the projections 46a, 46b will become spaced too far apart and their vortex generating characteristics will diminish.
- any combination of the complex dimples 40a-40d can placed on the surface 26 of the golf ball 20 to either enhance the performance of the golf ball or to improve the aesthetics of the ball. All the dimples on the golf ball do not need to have vortex generators. Rather, it is anticipated that a uniform disbursement of vortex-generating complex dimples over the surface of the golf ball, intermingled with traditional dimples, will give both the best performance and the best aesthetics.
- FIG. 14 shows a polar view of the golf ball 20 with the second and fourth of the above described vortex-generating complex dimples 40b, 40d interspersed among traditional dimples 22.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00988483A EP1224016A2 (en) | 1999-10-25 | 2000-10-24 | Golf ball dimple structures with vortex generators |
AU24689/01A AU2468901A (en) | 1999-10-25 | 2000-10-24 | Golf ball dimple structures with vortex generators |
JP2001532865A JP2003512141A (en) | 1999-10-25 | 2000-10-24 | Golf ball dimple structure with vortex formation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/426,397 US6315686B1 (en) | 1999-10-25 | 1999-10-25 | Golf ball dimple structures with vortex generators |
US09/426,397 | 1999-10-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001030455A2 true WO2001030455A2 (en) | 2001-05-03 |
WO2001030455A3 WO2001030455A3 (en) | 2001-09-13 |
Family
ID=23690648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/041475 WO2001030455A2 (en) | 1999-10-25 | 2000-10-24 | Golf ball dimple structures with vortex generators |
Country Status (5)
Country | Link |
---|---|
US (2) | US6315686B1 (en) |
EP (1) | EP1224016A2 (en) |
JP (1) | JP2003512141A (en) |
AU (1) | AU2468901A (en) |
WO (1) | WO2001030455A2 (en) |
Cited By (2)
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EP2316544A1 (en) * | 2009-10-28 | 2011-05-04 | Nike International, Ltd. | Golf ball with projections adjacent dimples |
JP2016123559A (en) * | 2014-12-26 | 2016-07-11 | ブリヂストンスポーツ株式会社 | Golf ball |
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US6315686B1 (en) * | 1999-10-25 | 2001-11-13 | Gilbert Barfield | Golf ball dimple structures with vortex generators |
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US6475106B1 (en) * | 2000-10-31 | 2002-11-05 | Spalding Sports Worldwide, Inc. | Golf ball with grooved dimples |
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US8591355B2 (en) * | 2002-02-15 | 2013-11-26 | Acushnet Company | Golf ball with dimples having constant depth |
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US6749525B2 (en) | 2002-05-23 | 2004-06-15 | Acushnet Company | Golf balls dimples |
US7229364B2 (en) * | 2002-05-23 | 2007-06-12 | Acushnet Company | Golf ball dimples |
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US7128666B2 (en) | 2003-08-18 | 2006-10-31 | Callaway Golf Company | Dimples comprised of two or more intersecting surfaces |
US7241233B2 (en) * | 2004-04-22 | 2007-07-10 | Bridgestone Sports Co., Ltd. | Golf ball |
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US10335640B2 (en) * | 2014-12-30 | 2019-07-02 | Acushnet Company | Golf ball dimple surface |
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1999
- 1999-10-25 US US09/426,397 patent/US6315686B1/en not_active Expired - Lifetime
-
2000
- 2000-10-24 JP JP2001532865A patent/JP2003512141A/en active Pending
- 2000-10-24 EP EP00988483A patent/EP1224016A2/en not_active Withdrawn
- 2000-10-24 AU AU24689/01A patent/AU2468901A/en not_active Abandoned
- 2000-10-24 WO PCT/US2000/041475 patent/WO2001030455A2/en active Search and Examination
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2001
- 2001-10-15 US US09/977,628 patent/US6547678B2/en not_active Expired - Lifetime
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US4877252A (en) | 1987-11-03 | 1989-10-31 | Dunlop Limited A British Company | Golf balls |
US4960282A (en) | 1987-11-03 | 1990-10-02 | Dunlop Limited | Golf balls |
US5536013A (en) | 1993-06-23 | 1996-07-16 | Hansberger Precision Golf Incorporated | Golf ball |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2316544A1 (en) * | 2009-10-28 | 2011-05-04 | Nike International, Ltd. | Golf ball with projections adjacent dimples |
CN102049125A (en) * | 2009-10-28 | 2011-05-11 | 耐克国际有限公司 | Golf ball with projections adjacent dimples |
US8556751B2 (en) | 2009-10-28 | 2013-10-15 | Nike, Inc. | Golf ball with projections adjacent dimples |
JP2016123559A (en) * | 2014-12-26 | 2016-07-11 | ブリヂストンスポーツ株式会社 | Golf ball |
Also Published As
Publication number | Publication date |
---|---|
AU2468901A (en) | 2001-05-08 |
JP2003512141A (en) | 2003-04-02 |
US6547678B2 (en) | 2003-04-15 |
EP1224016A2 (en) | 2002-07-24 |
US20020025864A1 (en) | 2002-02-28 |
WO2001030455A3 (en) | 2001-09-13 |
US6315686B1 (en) | 2001-11-13 |
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