CN201370936Y - Golf club head - Google Patents

Abstract

The utility model relates to a golf club head with many slots on the striking face, one of them slot contains: the first curved side surface, the second curved side surface opposite to the first curved side surface and the bottom surface for connecting the first curved side surface and the second curved side surface. The first and second curved side surfaces have first and second involute profiles, respectively, as viewed from the longitudinal direction of the groove, and the distance between the first and second curved side surfaces increases from the bottom surface toward the striking surface.

Description

golf club head

technical field

The utility model relates to a golf club head, in particular to a golf club head in which the groove on the striking surface has a specific profile.

Background technique

In the game of golf, hitters typically choose a particular golf club based on the distance the golf ball needs to fly when hitting the ball. However, in a golf game, the factors related to the flying distance of the golf ball include, in addition to the selection of the golf club, the condition of the golf ball after it hits the ground. The movement of the golf ball after landing is mainly affected by the amount of backspin (Backspin) given to the golf ball by the golf club when hitting. A higher amount of backspin can reduce the forward rolling of the golf ball after landing, generally less Rolling forward improves the accuracy of where the golf ball lands on the green. Conversely, if the amount of backspin is too little, the golf ball tends to roll forward after landing, and too much forward roll may cause the golf ball to roll off the green or away from the hole.

In order to obtain backspin when striking, generally golf heads are provided with grooves (Grooves) on the striking surface, and the grooves can affect the contact characteristics between the striking surface of the golf club head and the golf ball during striking. This in turn affects the amount of spin the golf ball has after it hits the ball. In order to increase the amount of spin after the golf ball is hit, various designs of the grooves of the golf head have been proposed. However, for the fairness of the game, the golf club heads used in the game generally need to comply with the specifications set by the U.S. Golf Association ("USGA"), such as groove width, groove depth, or groove and groove. The distance between slots. Under these specifications, it will become very difficult to make the grooves of the golf ball hitting surface fully meet these specifications to become effective grooves, and at the same time take into account the amount of backspin after hitting, and usually can produce a higher amount of backspin The groove design cannot meet the relevant specifications. Conversely, the groove design that meets the relevant specifications provides a relatively low amount of backspin.

Therefore, it is necessary to provide a new type of golf club head that can comply with the USGA's groove specification on the striking surface of the golf club head and can effectively provide the required amount of backspin when the golf ball is struck.

Utility model content

The purpose of the utility model is to provide a golf club head, which can not only easily comply with the groove specification of the USGA on the striking surface of the golf club head, but also effectively provide the amount of backspin required when the golf ball is hit.

To achieve the above object, an embodiment of the present invention provides a golf club head with a plurality of grooves formed on the striking surface, wherein one groove includes: a first curved side, a second curved side opposite to the first curved side Two curved sides and a bottom surface for connecting the first and second curved sides. Viewed from the longitudinal direction of the groove, the first and second curved sides have first and second involute profiles respectively, and the distance between the first and second involute sides increases from the bottom surface toward the striking surface.

The utility model has the advantages of increasing the amount of backspin of the golfer when hitting the ball, so as to improve the performance during the game and increase the competitiveness of the golfer. In addition, another advantage of the present invention is that under the same groove opening width, compared with the bottom width of the known V-shaped or U-shaped grooves, the bottom width of the groove of the present invention is wider, so The groove processing of the utility model is relatively easy and not easy to damage the processed cutter.

Description of drawings

In order to have a better understanding of the viewpoints of the present utility model, please refer to the above detailed description and cooperate with the corresponding drawings. It is emphasized that, in accordance with the standard practice in the industry, the various features of the drawings are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily expanded or reduced for clarity of illustrating the above-described embodiments. The contents of relevant drawings are explained as follows.

FIG. 1 is a front view illustrating a golf club head according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of one of the grooves in FIG. 1;

FIG. 3 is a schematic cross-sectional view of the groove in FIG. 2 after being cut along the section line 33 in FIG. 1;

4 is a schematic cross-sectional view illustrating a groove according to another embodiment of the present invention;

FIG. 5A is a schematic diagram illustrating a cross-sectional shape of a groove according to an embodiment of the present invention;

FIG. 5B is a schematic diagram illustrating the cross-sectional shape of a known trench.

[Description of main component symbols]

100: golf club head 102: strike panel

102a: strike surface 102b: groove

102c: Groove 102d: Groove

102e: bottom surface 102f: involute profile

102g: Involute profile 102h: Intersection line

102i: Transfer line 104: Main body

106: Bottom 108: Plane

110a: Tangent 110b: Tangent

112a: Lower connection area 112b: Lower connection area

114a: Upper connection area 114b: Upper connection area

502: straight line 504: normal line

506: Straight line 508: Normal

33: Section line C _b : Base circle

D: USGA trench depth d: USGA trench width

O: center of circle r _b : radius

T1: cut point T2: cut point

α: pressure angle θ ₁ : included angle

θ ₂ : Angle θ ₃ : Angle

θ ₄ : angle

Detailed ways

Although the present invention can be embodied in different forms, those shown in the drawings and described below are embodiments of the present invention, and please understand that what is disclosed herein is considered to be an example of the present invention, and is not intended to It is intended to limit the invention to the drawings and/or the specific embodiments described.

FIG. 1 shows a golf club head 100 according to one embodiment of the present invention. The golf club head 100 generally includes two parts, namely the striking faceplate 102 and the main body 104 . The striking face plate 102 has a striking surface 102 a , and a plurality of grooves 102 b are formed on the striking surface 102 a , wherein the plurality of grooves 102 b extend substantially horizontally and are parallel to the sole 106 of the golf club head 100 .

In the present utility model, the main body 104 includes the parts of the aforementioned golf club head 100 except the striking panel 102. The main body 104 can be made of carbon steel (such as S20C or S25C carbon steel), stainless steel (such as 17-4PH stainless steel), Metal materials such as alloy steel, iron-manganese-aluminum alloy, nickel-based alloy, cast iron, superalloy steel, pure titanium, titanium alloy (such as Ti6Al4V or CPTi titanium alloy), aluminum alloy, magnesium alloy, or copper alloy are used for manufacturing. The striking panel 102 and the main body 104 can be integrally formed by casting, powder sintering, forging, or machining. In addition, the golf club head 100 of the present invention can be formed by integrally casting the main body 104 with the mounting opening of the striking panel 102 by using the dewaxing method, and then disposing and welding the striking panel 102 to the opening of the main body 104 . If there is a step of welding the striking panel 102 and the main body 104, the finished golf club head 100 after welding can be further subjected to grinding (Grinding), polishing (Polishing) or age hardening (Age Hardening). The strike panel 102 to be welded to the main body 104 can be manufactured by extrusion, casting or forging. In other embodiments, the golf club head 100 may also have other designs, for example, the above-mentioned striking face plate 102 and the main body 104 may be integrally formed.

In addition, in order to adjust the center of gravity of the golf club head, the general golf club head can also include a counterweight, wherein the counterweight can be made of a material whose specific gravity is greater than that of the golf club head body, such as: tungsten alloy, tungsten Iron-nickel alloy, copper alloy or the above composition, and can be made by casting, forging, powder metallurgy and other methods.

Please refer to FIGS. 2 and 3 , which are respectively a schematic perspective view of one of the grooves 102 b in FIG. 1 , and a schematic cross-sectional view of the groove 102 b shown in FIG. 2 after being cut along the section line 33 in FIG. 1 . The groove 102b includes a curved side 102c, a curved side 102d and a bottom 102e, wherein the curved side 102c is opposite to the curved side 102d and located on both sides of the bottom 102e, that is, the bottom 102e connects the curved side 102c and the curved side 102d. As shown in Figure 2, viewed from the longitudinal direction of the groove 102b, the curved side 102c and the curved side 102d have an involute profile 102f and an involute profile 102g respectively, and the distance between the involute profile 102f and the involute profile 102g The distance increases from the bottom surface 102e toward the striking surface 102a.

Please refer to FIGS. 2 and 3 at the same time. The involute profile 102f and the involute profile 102g are generated by the base circle _Cb and another base circle (not shown) respectively, wherein the curved side 102c and the curved side 102d are respectively connected to the bottom surface 102e intersects with intersecting line 102h and intersecting line 102i (as shown in FIG. 2 ), intersecting line 102h is tangent to base circle _Cb , and intersecting line 102i is tangent to another base circle.

The following takes the involute profile 102f as an example to illustrate the generation of the involute profile 102f and the involute profile 102g. Referring to FIG. 3, the coordinates of the involute profile 102f satisfy the following equation:

$\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; the\; tan</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; cos</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; the\; tan</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; )</span>$

The coordinate origin is the center O of the base circle C _b , r _b is the radius of the base circle C _b , and α is the pressure angle between the involute profile 102f and the base circle C _b . The desired involute profile 102f can be produced by determining the position of the center O of the base circle C _b and the size of the radius r _b . Because the development direction of the involute profile 102g is opposite to that of the involute profile 102f, when the involute profile 102g is to be produced, the positive and negative directions of the coordinate axis x of the involute profile 102g must be in line with the coordinate axis x of the involute profile 102f Positive and negative directions are opposite. Using the involute to design the longitudinal contour lines of the curved side 102c and the curved side 102d of the groove 102b can make the occlusal rotational contact point of the ball and the groove 102b maintain on the pitch circle (not shown) during hitting the ball, reducing the The occurrence of sliding phenomenon, which in turn makes the rotation more smooth and improves the amount of backspin of the ball. In addition, for the longitudinal outline of the transition zone where the curved side 102c and the striking surface 102a join, there are relevant regulations in the USGA specification, which are as follows: first consider two concentric circles with radii of 0.010 inch and 0.011 inch respectively (not shown), the two concentric circles are placed in Fig. 3 so that the circle with a radius of 0.010 inches is tangent to the longitudinal outline of the curved side 102c and the striking surface 102a at the same time, if the curved side 102c and the striking surface 102a The groove 102b does not comply with the USGA specification if the longitudinal outline of the joined transition area protrudes beyond a circle with a radius of 0.010 inches. It can be known from FIG. 3 in conjunction with the above specification that the groove 102b is more likely to comply with the USGA specification because the development direction of the involute profile 102f of the groove 102b is consistent with the bending direction of the concentric circles.

In this embodiment, the radius r _b of the base circle C _b that produces the involute profile 102f is equal to the radius of the base circle (not shown) that produces the involute profile 102g, and viewed from the longitudinal direction of the groove 102b, the groove The groove 102b is substantially symmetrical to the plane 108, wherein the plane 108 divides the bottom surface 102e into two, as shown in FIGS. However, in other embodiments, it is not limited thereto, that is, the radius r b of the base circle C _b that generates the involute profile 102f may be different from the radius r _b of the base circle (not shown) that generates the involute profile 102g , or the trench 102b may be asymmetrical to the plane 108 that divides the bottom surface 102e into two.

Please refer to FIG. 3 again, the groove 102b of the golf club head 100 has a USGA groove width d, wherein the USGA groove width d is the straight-line distance between the tangent point T1 and the tangent point T2, and passes through the tangent point T1 and the tangent point T2 The relative tangent 110a and tangent 110b are tangent to the curved side 102c and the curved side 102d respectively, and the angle θ1 between the tangent 110a and the striking surface 102a _is 30 degrees, and the angle θ between the tangent 110b and the striking surface 102a ₂ is also 30 degrees. In a preferred embodiment, the USGA groove width d is less than or equal to 0.037 inches (0.9398 mm).

Please also refer to FIG. 3 , viewed from the longitudinal direction of the groove 102b, the groove 102b of the golf club head 100 has a USGA groove depth D, wherein the USGA groove depth D is the extension line of the striking surface 102a (as shown in FIG. 3 The vertical distance between the dotted line part) and the lowest point of the bottom surface 102e. In a preferred embodiment, the USGA trench depth D is less than or equal to 0.020 inches (0.508 mm).

In FIG. 3 , a straight line (not shown) is provided on the involute profile 102f or the involute profile 102g of the groove 102b. This line is tangent to the involute profile 102f or the involute profile 102g and passes through the involute The upper endpoint of the line profile 102f or the involute profile 102g, the point of tangency between the straight line and the involute profile intersects the surface of the striking panel at one point, and at the same time, a normal line (not shown) is provided on the bottom surface 102e of the groove 102b, This normal is perpendicular to the bottom surface 102e. In a preferred embodiment, the angle between the aforementioned straight line and the normal is less than or equal to 40 degrees and greater than or equal to 28.5 degrees.

As shown in FIGS. 2 and 3 , in this embodiment, the bottom surface 102e is substantially a plane, but in other embodiments, the bottom surface 102e can also be designed as a curved surface.

Please refer to FIG. 4 , which is a schematic cross-sectional view of a groove according to another embodiment of the present invention. The groove is similar to the groove 102b shown in FIG. 3 , including a curved side 102c, a curved side 102d and a bottom 102e. As shown in FIG. 4 , when viewed from the longitudinal direction of the groove, the curved side 102c and the curved side 102d also have an involute profile 102f and an involute profile 102g respectively. The difference between the groove shown in FIG. 4 and the groove 102b shown in FIG. 3 is that the groove shown in FIG. 4 also includes a lower connection region 112a and a lower connection region 112b, and the lower connection region 112a is between the bottom surface 102e and the curved side. 102c, and the lower connection area 112b is between the bottom surface 102e and the curved side 102d, wherein the lower connection area 112a and the lower connection area 112b are both curved surfaces, and the contours of the curved surfaces of the lower connection area 112a and the lower connection area 112b are respectively The involute profile 102f is different from the involute profile 102g. In addition, the groove shown in FIG. 4 also includes an upper connection area 114a and an upper connection area 114b. The upper connection area 114a is between the striking surface 102a and the curved side surface 102c, while the upper connection area 114b is between the striking surface 102a and the curved side surface 102c. Among the curved sides 102d, the upper connecting area 114a and the upper connecting area 114b are both curved surfaces, and the profiles of the curved surfaces of the upper connecting area 114a and the upper connecting area 114b are different from the involute profile 102f and the involute profile 102g respectively. From the above, it can be seen that the contours of the lower connection region 112a and the upper connection region 114a additionally included in the trench conform to an equation different from the equation that produces the involute contour 102f, while the contours of the lower connection region 112b and the upper connection region 114b conform to the equation The equations are different from the equations that produce the involute profile 102g. In addition, in this embodiment, the trench has the lower connection region 112a, the lower connection region 112b, the upper connection region 114a, and the upper connection region 114b at the same time, but in other embodiments, the above-mentioned connection regions may be optionally included. area without including the entire connection area in the trench.

Example

Preparation of golf club head with grooves on face having involute profile

Firstly, the golf club head body and the striking faceplate are cast and prepared, wherein the body has a toe (Toe), a sole (Sole), an upper portion (Top) and a heel (Heel). grooves, the grooves can also be selected by casting, so that the cross-sectional shape of each groove is shown in Figure 5A. In Fig. 5 A, the angle θ ₃ of these different golf club heads is respectively 28.5 degrees, 35 degrees and 40 degrees, wherein a straight line 502 is provided through the upper endpoint of the involute profile of the striking panel of each golf club head, This straight line 502 is tangent to the involute profile, the point of tangency between the straight line 502 and the involute profile intersects with the face plate surface, and the bottom surface of each golf club head is provided with a normal line 504 perpendicular to the bottom surface, and the normal line 504 Translate to the tangent point between the straight line 502 and the involute contour, and the angle between the normal line 504 and the straight line 502 is the angle θ ₃ . In FIG. 5A , the grooves of each golf club head are bilaterally symmetrical, that is, they are located on both sides of the groove symmetrically with respect to the two involute profiles.

In addition, prepare golf club heads with customary grooves, so that the cross-sectional shape of each groove is as shown in Figure 5B, the angle θ of these different golf club heads is 28.5 degrees, 35 degrees and 40 degrees _respectively , The angle _θ4 is the included angle between the straight line 506 and the normal line 508, and the definitions of the straight line 506 and the normal line 508 are similar to the above-mentioned straight line 502 and the normal line 504, so the description will not be repeated here. In FIG. 5B, the grooves of each golf club head are also symmetrical.

The cross-sectional areas of the grooves of the golf club head with the involute profile of the present invention and the golf club head with conventional grooves are listed in Table 1 below. In Table 1, the distance between the two upper ends of the groove of each golf club head is the same, that is, the groove opening width of each golf club head is all the same, then it can be seen from Table 1 that there is The groove with the involute profile of the utility model has a larger cross-sectional area, and because the involute profile is a curved curve, the width of the bottom surface of the involute profile groove of the utility model is larger than that of the conventional groove Therefore, the involute profile groove of the utility model is relatively easy to process, and the processing tool is less likely to be broken and damaged.

Table I

The utility model angle θ ₃ (28.5 degrees) Customary angle θ ₄ (28.5 degrees) The utility model angle θ ₃ (35 degrees) Customary angle θ ₄ (35 degrees) The utility model angle θ ₃ (40 degrees) Customary angle θ ₄ (40 degrees) Surface groove cross-sectional area mm ² 0.264414 0.245506 0.263248 0.227172 0.247685 0.199061

Table 2 below shows the amount of backspin of the golf ball after being hit. The unit of the amount of backspin is rpm (Revolution Per Minute). Golf club heads with profile grooves, and golf club heads with conventional grooves, tested at a swing speed of 30m/sec and with a golf club head with a distribution of hitting angles between 50° and 60° .

Table 3 compares the recorded values of backspin of the golf club head using the conventional grooves in Table 2 after hitting the ball, and Table 4 compares the golf balls in Table 2 using the involute contour grooves of the present invention. The recorded values of golf ball spin after the club head hit the ball were compared.

Table II

Table three

Table four

It can be seen from Table 3 and Table 4 that under the same hitting angle, the larger the angles θ ₃ and θ ₄ of the groove, the smaller the backspin of the hit golf ball. Below θ ₃ or θ ₄ , the larger the hitting angle is, the smaller the amount of backspin of the hit golf ball will be.

As can be seen from Table 3, when the golf ball is hit by a golf club head with a customary groove, when the hitting angle is 50 degrees, the angle _θ of the groove changes from 28.5 degrees to 40 degrees, and the golf ball The amount of spin dropped by 19.7%, and when the hitting angle was 60 degrees, the amount of spin dropped by even as high as 30.0%.

In contrast to Table 4, when the golf ball is struck by the golf club head adopting the involute profile groove of the present invention, when the hitting angle is 50 degrees, the angle _θ of the groove changes from 28.5 degrees to 40 degrees, and the golf ball The amount of spin dropped by 6.5% on the ball, and 10.0% on the golf ball when the ball was hit at an angle of 60 degrees.

As can be seen from the above comparison, when the groove angles θ ₃ and θ ₄ vary between 28.5 degrees and 40 degrees, the utility model can effectively reduce the loss of backspin to below 10%. Compared with the known technology, its The loss of backspin can be up to 30.0%. When taking the angle combination condition of the lowest amount of backspin, the utility model can increase the amount of backspin from the original 609 to 927rpm, and the percentage of the increase of the amount of backspin can reach 52.2%. Therefore, the utility model can effectively provide the amount of backspin required when the golf ball is hit, and because the utility model adopts the involute profile design, wherein the involute profile is a curve, which is beneficial to comply with the USGA specification.

The features of various embodiments have been roughly described above, so that those skilled in the art can better understand the corresponding detailed description. Those skilled in the art will appreciate that using the disclosure as a basis, other programs and structures can be designed or modified to achieve the same purpose and/or advantages of the embodiments described in this specification. Those skilled in the art can also understand that without departing from the spirit and scope of the present disclosure, equivalent structures, and without departing from the spirit and scope of the present disclosure, various changes, substitutions and modifications can be made.

Claims (12)

1. a glof club head is characterized in that, has a scope of attack, and this scope of attack is formed with many grooves, and wherein at least one groove comprises:

One first curved side;

One second curved side with respect to this first curved side; And

One bottom surface, connect this first and this second curved side;

Wherein, by this at least one groove vertically look it, this first and second curved side has first and second involute contour respectively;

Wherein, the distance between this first and second curved side is increased progressively towards this scope of attack direction by this bottom surface.

2. glof club head according to claim 1 is characterized in that, this first involute contour is produced by one first basic circle;

Wherein this first curved side and this bottom surface join in one first handing-over line, and this first handing-over line and this first basic circle are tangent.

3. glof club head according to claim 1 is characterized in that, this second involute contour is produced by one second basic circle;

Wherein this second curved side and this bottom surface join in one second handing-over line, and this second handing-over line and this second basic circle are tangent.

4. glof club head according to claim 1 is characterized in that, this first and second involute contour is produced by one first basic circle and one second basic circle respectively;

Wherein the radius of this first basic circle is equal to the radius of this second basic circle.

5. glof club head according to claim 1 is characterized in that, by this one of them groove vertically look it, this one of them groove is symmetrical in a plane, and wherein this plane is divided into two with this bottom surface.

6. glof club head according to claim 5, it is characterized in that, this one of them groove has United States Golf Association's groove width, this United States Golf Association's groove width is the air line distance between two point of contacts, and be tangential on this first and second curved side respectively by the two relative tangent lines at this two point of contact, and the angle between this two tangent line and this scope of attack is 30 degree;

Wherein this United States Golf Association's groove width is less than or equal to 0.037 inch.

7. glof club head according to claim 5, it is characterized in that, vertically look it by this one of them groove, this one of them groove has United States Golf Association's gash depth, and this United States Golf Association's gash depth is the vertical range between a minimum point of an extension line of this scope of attack and this bottom surface;

Wherein this United States Golf Association's gash depth is less than or equal to 0.020 inch.

8. glof club head according to claim 5 is characterized in that, this one of them groove has an angle, and this angle is between a normal of a straight line and this bottom surface;

Wherein this straight line and this first or second involute contour are tangential on a upper extreme point, and this normal is vertical with this bottom surface;

Wherein this angle is less than or equal to 40 degree and spends more than or equal to 28.5.

9. glof club head according to claim 1 is characterized in that, this bottom surface is a plane.

10. glof club head according to claim 1 is characterized in that, this bottom surface is a curved surface.

11. glof club head according to claim 1, it is characterized in that, also comprise bonding pad, this time bonding pad is between this bottom surface and this first curved side, maybe this time bonding pad is between this bottom surface and this second curved side, and wherein the profile of this time bonding pad is different from this first and second involute contour.

12. glof club head according to claim 1, it is characterized in that, also comprise bonding pad on, should go up the bonding pad between this scope of attack and this first curved side, maybe this goes up the bonding pad between this scope of attack and this second curved side, and the profile of bonding pad is different from this first and second involute contour on wherein being somebody's turn to do.

Images