JP6077277B2 - Golf club head and design method - Google Patents

Description

  The present invention relates to a golf club head.

  Golf club heads typified by a wood type have been increasing in size year by year, and the influence of air resistance during swinging has increased. If the air resistance increases, the head speed may decrease, leading to a decrease in the flight distance of the hit ball. Patent Document 1 proposes a golf club head that focuses on a decrease in air resistance.

Special table 2011-528263 gazette

  In order to reduce the air resistance and improve the head speed, it is important to suppress the separation of the airflow from the golf club head. In order to suppress separation of the air flow from the crown portion, it is effective to round the crown portion. However, if the roundness of the crown portion is increased, the sound of the hitting sound tends to deteriorate.

  An object of the present invention is to suppress the deterioration of sound hitting while reducing air resistance.

According to the present invention, in a golf club head including a face portion and a crown portion and having a volume of 400 cc or more,
The crown portion is
Extending in the face-back direction and the toe-heel direction, and a drag reducing portion on the face side;
A hitting promotion portion that extends in the face-back direction and the toe-heel direction and is located on the back side of the drag reduction portion,
Face The face center of the face portion when the golf club head was placed on a horizontal plane to the specific lie angle as - in a virtual plane perpendicular to transverse back direction, the radius of curvature of the contour of the drag reduction unit less than 100mm And
The radius of curvature of the contour of the tapping sound promoting portion is Ri der least 200 mm,
The drag reduction unit is
Including the apex of the crown when the golf club head is disposed on a horizontal plane according to a specified lie angle;
The separation point at which the airflow flowing in the face-back direction is separated from the crown portion is located on the face portion side with respect to the hitting sound promoting portion,
A golf club head is provided.

  According to the present invention, it is possible to suppress the deterioration of the hitting sound while reducing the air resistance.

(A) And (B) is a perspective view and a side view of a golf club head according to an embodiment of the present invention. Explanatory drawing of a drag reduction part and a hitting sound promotion part. FIG. 3 is an end view taken along the line II of FIG. 2. (A) is explanatory drawing of a reference posture, (B) is explanatory drawing of a face center.

  FIG. 1A is a perspective view of a golf club head 10 according to an embodiment of the present invention. The golf club head 10 has a hollow body, and its peripheral wall forms a face portion 11 that forms a face surface (striking surface), a crown portion 12 that forms an upper portion of the golf club head 10, and a bottom portion of the golf club head 10. And a side portion 14 that forms the side portion of the golf club head 10. The side portion 14 includes a toe side portion, a heel side portion, and a back side portion. In addition, the golf club head 10 includes a hosel portion 15 to which a shaft is attached. The golf club head 10 is assumed to have a volume of 400 cc or more, and preferably 500 cc or less.

  The golf club head 10 is a golf club head for a driver, but the present invention is a wood type golf club head including a fairway wood other than a driver, a utility type (hybrid type) golf club head, and other hollow golf club heads. It is suitable for. The golf club head 10 can be made of a metal material. Examples of such a metal material include titanium-based metals (for example, 6Al-4V-Ti titanium alloy), stainless steel, and copper alloys such as beryllium copper. It is done.

  The golf club head 10 can be assembled by joining a plurality of parts. For example, a main body member that constitutes a peripheral portion of the crown portion 12, the sole portion 13, the side portion 14, and the face portion 11, and an opening is formed in a part corresponding to the face portion 11, and the main body member And a face member joined to the opening.

  In FIG. 1, an arrow D1 illustrates the face-back direction. The face-back direction is normally the flying ball direction (the target direction of the hit ball). Arrow D2 indicates the toe-heel direction. The toe-heel direction is a direction connecting the toe side end and the heel side end of the sole portion 13.

  The configuration of the crown portion 12 will be described with reference to FIGS. 1B, 2, and 3. FIG. 1B is a side view of the golf club head 10. More specifically, the golf club head 10 is viewed from the heel side when the golf club head 10 is disposed on a horizontal plane in accordance with a specified lie angle (hereinafter also referred to as a reference posture). FIG. 2 is an explanatory diagram of the drag reduction unit 12a and the hitting promotion unit 12b. More specifically, it is a plan view of the golf club head 10 in a reference posture. 3 is an end view taken along the line II of FIG. The II line coincides with a vertical virtual plane S that crosses the face center of the face portion 11 in the face-back direction.

  The reference posture will be supplemented with reference to FIG. 4A, and the face center will be described with reference to FIG.

  First, with reference to FIG. 4A regarding the reference posture, it is assumed that the golf club head 10 is disposed on the virtual horizontal plane Sh and the specified lie angle is θ1. A line XA is an axis line of a shaft attached to the hosel portion 15. If the specified lie angle is unknown, an average lie angle corresponding to the golf club number may be used. For example, in the case of a driver's golf club head, the angle is 59 degrees.

  Referring to FIG. 4B for the face center, a gauge G having vertical and horizontal scales is applied to the face portion 11, and a point that is the center of the vertical and horizontal scales is defined as a face center FC. The gauge G is a transparent thin plate in which holes are formed at the intersections of the vertical scale and the horizontal scale, and the same as the so-called impact point template can be used. The impact point template is a template for specifying the face center when measuring the CT value of the face portion.

  Next, the configuration of the crown portion 12 will be described with reference to FIG. 1 (B), FIG. 2 and FIG. The crown portion 12 includes a drag reduction portion 12a on the face portion 11 side, a sound hitting promotion portion 12b located on the back side of the drag reduction portion 12a, and a curvature transition portion 12c therebetween.

  The drag reducing portion 12a is formed with a shape for the purpose of reducing air resistance when the golf club head 10 is hit. Specifically, the curvature radius R1 of the contour in the D1 direction (face-back direction) is set to 100 mm or less at an arbitrary position of the drag reduction unit 12a.

  If the curvature radius R1 exceeds 100 mm, the effect of reducing the air resistance cannot be expected so much. If the radius of curvature R1 is smaller, the effect of reducing the air resistance is enhanced, but there is a limit and the shape of the crown portion 12 becomes distorted. Therefore, the curvature radius R1 is preferably 30 mm or more, and particularly preferably 50 mm or more and 80 mm or less.

  The drag reduction portion 12a is preferably started from the end portion on the face portion 11 side of the crown portion 12. In this embodiment, the drag reduction portion 12a is at least the periphery of the virtual plane S from the end portion on the face portion 11 side. It is started following TE.

  The radius of curvature of the top edge portion TE, which is the boundary portion between the face portion 11 and the crown portion 12, is minimized among the drag reduction portions 12a in that the air flow is prevented from separating from the crown portion 12 at an early stage. For example, it is preferably 3 mm or more and 10 mm or less.

  A longer width in the direction D1 (face-back direction) of the drag reducing portion 12a is preferable in that it takes a longer distance that does not separate the airflow, but there is a limit to a distance that can prevent the airflow from being separated, and It becomes difficult to form the hitting sound promoting portion 12b, which will be described later. Further, the position of the drag reducing portion 12a in the D1 direction (face-back direction) is preferably closer to the face portion 11. Here, as shown in FIG. 2, in the reference posture, from the first intersection P1 between the virtual plane S and the end of the crown portion 12 on the face portion 11 side, the virtual plane S and the back side of the crown portion 12 Let L be the horizontal distance to the second intersection P2 with the end. It is preferable that the back side end portion of the drag reducing portion 12a is located within a range of 0.3L to 0.5L in the horizontal distance from the first intersection P1 to the back side. That is, in FIG. 2, L1 = 0.3L to 0.5L.

  If the curvature radius of the entire crown portion 12 is reduced, the crown portion 12 is less likely to vibrate and the sound of the hitting sound becomes worse. Further, even if the radius of curvature of the entire crown portion 12 is reduced, the effect of reducing the air resistance is limited, and in particular, the region on the back side from the separation point of the air flow does not contribute to the reduction of the air resistance.

  The hitting sound promoting portion 12b is a portion in which the radius of curvature R2 is relatively increased for the purpose of improving the sound of the hitting sound. Specifically, the curvature radius R2 of the contour in the D1 direction (face-back direction) is set to 200 mm or more at an arbitrary position of the hitting sound promoting portion 12b.

  If the curvature radius R2 is less than 200 mm, the effect of improving the sound of hitting cannot be expected so much. When the radius of curvature R2 is larger, the effect of improving the sound of the hitting sound is enhanced. In the present embodiment, the hitting sound promoting portion 12b is a flat surface (curvature radius = ∞).

  When the curvature radius R2 is increased, the change in the curvature increases at the periphery of the hitting sound promoting portion 12b. Therefore, the hitting sound promoting portion 12b is likely to vibrate. FIG. 3 schematically shows the vibration mode of the hitting sound promoting portion 12b in an exaggerated manner. The sound hitting promotion part 12b vibrates in the direction of the arrow d3 as indicated by a broken line. As a result, the hitting sound can be made more reverberant.

The shape of the hitting sound promoting portion 12b may be any shape, but is preferably circular or elliptical in that it easily vibrates. In this embodiment, it is circular. If the area of the hitting sound promoting portion 12b is reduced, the hitting sound becomes higher, but the effect of improving the sound may be diminished. Therefore, the area of the hitting sound promoting portion 12b is preferably, for example, 700 to 8000 mm ² .

  It is preferable that the position in the D1 direction (face-back direction) of the hitting sound promoting part 12b is set with priority given to the position and range of the drag reducing part 12a. Therefore, in terms of preferentially securing the drag reducing portion 12a, the end portion on the face portion 11 side of the hitting sound promoting portion 12b has a horizontal distance in the range of 0.5L to 0.6L from the first intersection P1 to the back side. It is preferable to be located within. That is, in FIG. 2, L2 = 0.5L to 0.6L.

  Next, it is preferable that the hitting sound promoting portion 12 b includes the position of the antinode of the primary vibration mode of the crown portion 12. Thereby, the amplitude of the hitting sound promoting portion 12b is increased and the sound is further improved. The position of the antinode of the primary vibration mode of the crown portion 12 can be obtained by performing modal analysis by a computer or eigenvalue analysis by FEM. From the standpoint of achieving high sound output, the eigenvalue of the primary vibration mode of the crown portion 12 is preferably 4000 Hz or more.

  In the present embodiment, the thickness of the hitting sound promoting portion 12 b is thinner than the other portions of the crown portion 12. Thereby, it is possible to further facilitate the vibration of the hitting sound promoting portion 12b.

  In the case of the present embodiment, the hitting promotion part 12b is located on the back side from the peeling point indicated by the broken line DP in FIG. In other words, the peeling point DP is located closer to the face portion 11 than the hitting sound promoting portion 12b. The peeling point DP is a position where the air flow flowing in the direction D1 (face-back direction) peels from the crown portion 12. The peeling point DP can be identified from the result SR of the computer simulation (aerodynamic analysis).

  When the hitting sound promoting portion 12b is located on the back side with respect to the peeling point DP, the presence of the hitting sound promoting portion 12b does not adversely affect the aerodynamic performance of the golf club head 10.

  In the case of the present embodiment, the outer shape of the drag reduction unit 12a is set so that the peeling point DP is located on the back side of the drag reduction unit 12a. Usually, the peeling point DP is positioned on the back side of the apex TP of the crown portion 12, and therefore, in the present embodiment, the drag reducing portion 12a has a shape including the apex TP of the crown portion 12. The vertex TP is the highest point of the crown portion 12 when the golf club head 10 is in the reference posture. The peeling point DP can be positioned on the back side of the drag reducing portion 12a depending on the shape on the back side from the vertex TP. That is, the drag reduction unit 12a can prevent the air flow from separating early and reduce the air resistance.

  The drag reducing portion 12a and the hitting sound promoting portion 12b may be formed continuously in the D1 direction (face-back direction). However, in that case, the change in curvature at the boundary portion may be too rapid, and stress concentration, etc. As described above, the strength of the crown portion 12 may be affected.

  Therefore, in the present embodiment, the curvature transition portion 12c is formed between the drag reduction portion 12a and the hitting promotion portion 12b. The curvature transition portion 12c is a portion in which the curvature is gradually changed from the drag reduction portion 12a toward the hit sound promotion portion 12b, and the drag reduction portion 12a and the hit sound promotion portion 12b are smoothly connected. In the present embodiment, the peeling point DP is located at the curvature transition portion 12c.

  As described above, in the present embodiment, by providing the drag reducing unit 12a and the hitting sound promoting unit 12b, the drag reducing unit 12a improves the aerodynamic performance, and the hitting sound promoting unit 12b adversely affects the aerodynamic performance. The sound of the hitting sound can be improved within the range. Therefore, it is possible to suppress the deterioration of the hitting sound while reducing the air resistance.

  As a design method of the golf club head 10, for example, after the outline of the golf club head 10 is determined, the drag reduction unit 12a is first designed. Here, for example, aerodynamic analysis is performed on a computer for models with different specifications such as the outer shape, size, range, and the like of the drag reduction unit 12a. When the desired level of aerodynamic characteristics is obtained, the specifications of the drag reduction unit 12a are determined based on the content, and then the hitting sound promotion unit 12b is designed. Here, for example, for a model with different specifications such as the outer shape, size, range, thickness, etc. of the hitting sound promoting unit 12b, the hitting sound is simulated on a computer. When the target level of sound is obtained, the specification of the sound hit promotion unit 12b is determined based on the content. Thereby, the design of the drag reduction part 12a and the hitting sound promotion part 12b can be decided. When the target level of sound cannot be obtained, the design of the drag reduction unit 12a may be re-executed in order to improve the degree of freedom in design of the sound generation promoting unit 12b.

  On the other hand, when giving priority to the hitting sound, the hitting sound promoting part 12b is first designed, and then the drag reducing part 12a is designed.

Claims (11)

In a golf club head including a face portion and a crown portion and having a volume of 400 cc or more,
The crown portion is
Extending in the face-back direction and the toe-heel direction, and a drag reducing portion on the face side;
A hitting promotion portion that extends in the face-back direction and the toe-heel direction and is located on the back side of the drag reduction portion,
Face The face center of the face portion when the golf club head was placed on a horizontal plane to the specific lie angle as - in a virtual plane perpendicular to transverse back direction, the radius of curvature of the contour of the drag reduction unit less than 100mm And
The radius of curvature of the contour of the tapping sound promoting portion is Ri der least 200 mm,
The drag reduction unit is
Including the apex of the crown when the golf club head is disposed on a horizontal plane according to a specified lie angle;
The separation point at which the airflow flowing in the face-back direction is separated from the crown portion is located on the face portion side with respect to the hitting sound promoting portion,
A golf club head characterized by that. The separation point where the airflow flowing in the face-back direction is separated from the crown portion is located on the back side from the drag reduction portion,
The golf club head according to claim 1. The crown portion is
Including a curvature transition portion between the drag reduction portion and the hitting promotion portion,
The separation point at which the airflow flowing in the face-back direction separates from the crown portion is located on the curvature transition portion.
The golf club head according to claim 1. The sound hitting promotion part is thinner than other parts of the crown part.
The golf club head according to claim 1. The hitting sound promoting portion includes a position of an antinode of a primary vibration mode of the crown portion.
The golf club head according to claim 1. And the virtual plane, from the first intersection point between the face side of the end portion of the crown portion, and the virtual plane, the horizontal distance to the second point of intersection of the back side of the end portion of the crown portion when the L ,
The back side end of the drag reducing portion is located within a range of 0.3 L to 0.5 L in a horizontal distance from the first intersection to the back side,
The face portion side end of the hitting sound promoting portion is located within a range of 0.5 L to 0.6 L at a horizontal distance from the first intersection to the back side.
The golf club head according to claim 1. The sound hitting promotion part is circular or elliptical in a plan view seen from the crown part side .
The golf club head according to claim 1. The drag reduction portion is elliptical in a plan view as seen from the crown portion side.
The golf club head according to claim 1 . The sound hitting promotion part is a flat surface.
The golf club head according to claim 1 . In a method for designing a golf club head including a face portion and a crown portion and having a volume of 400 cc or more,
A drag reduction unit design process for designing the anti-force reducing unit that is formed on the face side of the crown portion,
Anda striking noise promoting portion design process for designing a striking sound promoting portion you located on the back side of the drag reduction portion at the crown portion,
The drag reduction part is a vertical imaginary plane that crosses the face center of the face part in the face-back direction when the golf club head is arranged on a horizontal plane in accordance with a specified lie angle. 100 mm or less,
The sound hitting promotion part is a curvature radius of the contour in the virtual plane is 200 mm or more,
In the drag reduction part design process,
About the model of the golf club head with different specifications of the drag reduction unit, aerodynamic analysis is performed on a computer to determine the specification of the drag reduction unit,
The hit sound promoting part design process is performed after the specification of the drag reducing part is determined.
A design method characterized by that. In a method for designing a golf club head including a face portion and a crown portion and having a volume of 400 cc or more,
A drag reduction unit design process for designing the anti-force reducing unit that is formed on the face side of the crown portion,
Anda striking noise promoting portion design process for designing a striking sound promoting portion you located on the back side of the drag reduction portion at the crown portion,
The drag reduction part is a vertical imaginary plane that crosses the face center of the face part in the face-back direction when the golf club head is arranged on a horizontal plane in accordance with a specified lie angle. 100 mm or less,
The sound hitting promotion part is a curvature radius of the contour in the virtual plane is 200 mm or more,
In the sound hitting promotion part design process,
For the model of the golf club head with different specifications of the hitting sound promoting part, the hitting sound promoting part is determined by performing a simulation of hitting sound on a computer,
The drag reduction unit design process is performed after the specification of the hitting promotion unit is determined.
A design method characterized by that.

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