JP2007185502A - Golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club, reducing energy loss to improve resilience and enlarging a drive-out angle to improve carry in hitting a ball. <P>SOLUTION: This golf club includes: a shaft 5; and a head 7 of a hollow structure, secured to one end of the shaft 5 at a regulated lie angle α and a loft angle preset to the reference horizontal plane P. The head 7 includes a face part 7a having a ball hit surface for hitting a ball, a crown part 7b, a side part 7d, and a sole part 7c, wherein the inner surface of the face part 7a has a rib 10 provided below the central part C of the face part and projecting toward the center side of the head. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a golf club, and more particularly, to a golf club having a hollow structure head.

  Conventionally, in a golf club having a hollow structure, various ideas have been applied in order to improve the flight distance. For example, Patent Document 1 discloses a golf club that has a hollow structure with a low rigidity and improves a flight distance with respect to a head having a hollow structure. According to this golf club, by reducing the rigidity of the crown portion, the crown portion is bent at the time of impact, and the face portion is inclined with the boundary with the sole as a fulcrum. As a result, the loft angle increases, the backspin amount due to the gear effect decreases, and the flight distance can be improved while maintaining the same launch angle.

Further, for example, Patent Document 2 relates to a head having a hollow structure, in which the center of the face portion is thick and the periphery thereof is thin, and a plurality of groove portions extending in the left-right direction above the center thick portion are provided. A formed golf club is disclosed. According to this golf club, the upper side of the thick portion is deformed more than the lower side at the time of impact, so that the launch angle can be increased and the flight distance can be improved.
JP-A-4-135576 JP 2004-188775 A

  The golf club disclosed in Patent Document 1 described above has a configuration in which the entire face portion is inclined at the time of hitting the ball, so that the energy loss at the time of hitting the ball is increased and the resilience is lowered. Further, since the entire face portion is bent, the launch angle cannot be increased so much, and as a result, there is a limit to the improvement of the flight distance.

  On the other hand, according to the golf club disclosed in Patent Document 2 described above, by forming the groove portion, the upper side of the face portion is more easily bent than the lower side, and the launch angle can be easily increased. However, since the thin wall portion is formed around the face portion, the entire face portion is bent at the time of impact. That is, the energy loss at the time of hitting the ball is large, and the resilience is lowered.

  The present invention has been made on the basis of the above-mentioned problems, and provides a golf club that can improve resilience by reducing energy loss and can increase a launch angle and improve a flight distance when hitting a ball. With the goal.

  In order to achieve the above object, a golf club according to the present invention comprises a shaft and a hollow structure head fixed to one end of the shaft with a specified lie angle and loft angle set to a reference horizontal plane. The head includes a face portion having a ball striking surface for hitting a ball, a crown portion, a side portion, and a sole portion, and an inner surface of the face portion is below the center portion of the face portion, A rib protruding toward the center of the head is provided.

  According to the golf club having the head having the structure as described above, by providing the rib on the back side of the face portion, the specific strength and specific rigidity on the lower side of the face portion are improved, and the lower region is bent. And the upper region can be partially deformed. For this reason, the entire face portion does not bend at the time of hitting the ball, thereby reducing the energy loss and improving the resilience. Further, by providing the rib, it becomes easy to incline the upper side of the face portion with the vicinity above the rib as a fulcrum, and the hitting angle is increased by hitting a ball immediately above the portion where the inclination is increased. And the flight distance can be improved. Furthermore, by providing ribs on the back surface of the face portion, it is possible to increase the degree of freedom in designing the center of gravity and the moment of inertia design. Note that the above-described ribs only have to protrude toward the center of the head, and may be integrally formed with the face portion, or may be integrally formed with the sole portion and the side portion.

  According to the present invention, it is possible to obtain a golf club that can reduce energy loss at the time of hitting and improve resilience, and increase a launch angle to improve a flight distance.

Hereinafter, embodiments of a golf club according to the present invention will be described.
1 to 5 are views showing a first embodiment of a golf club according to the present invention. FIG. 1 is a front view of the golf club, FIG. 2 is a front view of a head, and FIG. FIG. 4 is a cross-sectional view taken along the line A, FIG. 4 is a cross-sectional view taken along the line BB in FIG. 3, and FIGS. .

  In the golf club 1 according to the present embodiment, a head 7 set to a specified lie angle α and loft angle β with respect to a reference horizontal plane P is fixed to the tip of a shaft 5 made of metal or FRP. It is configured. In this case, the head body 7A constituting the head 7 includes a face portion 7a having a hitting surface, a crown portion 7b extending rearward from the upper edge of the face portion 7a, and extending rearward from the lower edge of the face portion 7a. And a sole portion 7c that extends from the toe side edge of the face portion to the heel side edge of the face portion, and connects the edge portions of the crown portion 7b and the sole portion 7c. It is formed in the hollow structure provided with the side part 7d. In the drawings, the toe portion, the back portion, and the heel portion constituting such a side portion 7d are indicated by reference numerals 7e, 7f, and 7g, respectively.

  A face member 8 on which a hit ball is actually formed is provided on the face portion 7a. In this case, the face member 8 may be formed of a plate-like member that closes the front opening of the crown portion 7b, the sole portion 7c, and the side portion 7d (the entire face portion is constituted by a face member). ) As in the present embodiment (see FIG. 3), it may be formed in a so-called cup shape and may constitute a part of the crown portion 7b, the sole portion 7c, and the side portion 7d. Alternatively, an opening having a predetermined size may be formed in the face portion 7a, and a plate-like face member may be fitted into the opening.

  The head main body 7A is, for example, a titanium alloy (Ti-6Al-4V, Ti-15V-3Cr-3Sn-3Al), an iron-based alloy (17-4ph, SUS304) other than the face member 8 provided on the face portion 7a. ), Or castum 450 (Carpenter) or the like is preferably integrally formed, and a face member 8 formed in a cup shape constituting the hitting surface of the face portion 7a is welded and bonded to the front side thereof. An opening 7 </ b> B that is fixed by, for example, is formed. Of course, in the head main body 7A, each member (face portion, crown portion, sole portion, side portion; outer shell member) constituting the head main body 7A is individually formed and fixed by welding, bonding or the like. good.

  The face member 8 provided on the face portion 7a is, for example, a titanium alloy (Ti-15V-3Cr-3Sn-3Al, Ti-6Al-4V, SP700, Ti-15V-6Cr-4Al, Ti-15Mo-5Zr-3Al). ), Iron-based alloy (Custum455,465 (Carpenter), 18Ni-12Co-4.5Mo-1.5Ti-Fe), or Ti-30Nb-10Ta-5Zr, etc. It is preferable to integrally form by pressing or forging, and the face member 8 formed in this way is fixed to the end face of the opening 7B by adhesion, welding, brazing or the like. Of course, the face portion 7a may be integrally formed with the head main body 7A instead of fixing the face member 8 as a separate member.

  Further, a shaft fastening portion (not shown) for fastening the tip of the shaft 5 is integrally formed in the head main body 7A. In this case, the shaft is fixed to the shaft fixing portion by inserting the tip end portion of the shaft through the opening hole formed in the crown portion 7b. The shaft fastening portion and the crown portion 7b may be separated from each other or may be integrally connected. Alternatively, the shaft fastening portion and the crown portion 7b may be connected by a low rigidity member such as rubber or synthetic resin.

  Ribs 10 are formed on the inner surface of the face portion 7a. The rib is a member that protrudes from the inner surface of the face portion 7a toward the center of the head, and has a function of improving the specific rigidity and specific strength of a specific region (lower region) of the face portion having a hitting surface. In this case, if the protruding amount with respect to the inner surface becomes too large, the rib will increase in weight too much and the degree of freedom of design will decrease, and if the protruding amount becomes too small, the specific rigidity and specific strength will be improved sufficiently. Therefore, the amount of protrusion with respect to the inner surface is preferably set in the range of 1.0 mm to 13.0 mm. Also, the width is preferably set in the range of 1.0 mm to 6.0 mm for the same reason. As for the thickness of the face surface around the rib, if the thickness is too thick, the weight increase becomes too large and the degree of freedom in design becomes small. It is preferable to set it in a range of ˜5.0 mm.

  The rib 10 has a lateral rib 10a extending along the toe-heel direction and a crown-sole direction so as to effectively improve the specific rigidity and specific strength of the lower area of the ball striking surface. It is preferable that the vertical rib 10b is provided. And in the structure of this embodiment, these horizontal ribs and vertical ribs are integrally formed by casting, forging or the like together with the face member 8 constituting the face portion. Moreover, these horizontal ribs and vertical ribs may be formed continuously as shown in the drawing, or may be formed separately. Further, the numbers of the horizontal ribs and the vertical ribs are set as appropriate, and the directivity thereof may not be exactly parallel to or perpendicular to the reference horizontal plane P (see FIG. 13).

  The position where the rib 10 is provided is set below the face center C which is the center of the face portion 7a. Here, the face center C takes an intermediate perpendicular line of the maximum width L (heel side face boundary point P1, toe side face boundary point P2) constituting the hitting surface, and the crown side face on the intermediate normal line. It is defined by the center between the boundary point P3 and the sole-side face boundary point P4. The face boundary points P1 to P4 are usually defined by changes in the edge portion and finish (satin finish, mirror finish, blast finish, paint finish, etc.), but an R curved surface that cannot be determined by such criteria. If it is continuous, the position is smaller than R60.

  The rib 10 of this embodiment is such that one horizontal rib 10a extends parallel to the reference horizontal line P and is connected to the side portion of the head body when the head 7 is installed on the reference horizontal line P with a lie angle α. The three vertical ribs 10b are formed at predetermined intervals so as to be orthogonal to the horizontal ribs 10a. Of the three vertical ribs 10b, the central rib is formed longer than the ribs on both sides so as to correspond to the shape of the face portion.

  As a result, as shown in FIG. 2, the range H1 in the height direction where the ribs 10 are formed has higher specific rigidity and specific strength than the range H2 in the height direction where the ribs 10 are not formed. The upper side of the face part is more easily bent than the lower side, and the entire face part is suppressed from being bent. In this case, if the range H1 in the height direction in which the ribs 10 are formed becomes too large, the range in which a high initial velocity can be obtained at the time of hitting the ball is too small. On the other hand, since a high launch angle cannot be obtained when it becomes small, it is preferable to set the maximum height of the face portion 7a to a range of 0.2H to 0.5H, where H is H. In addition, regarding the base point of the lower end defining H and H1, when the height of the lower end of the face surface and the sole surface are different, the lower end (P4) of the face surface is the base point.

  In the head having the above-described configuration, the position where the rebound of the face portion is the largest (the maximum repulsion position measured in accordance with the pendulum test specified by the USGA. Details were issued by the USGA on February 24, 2003. IS described in “Technical Description of the Pendulum Test” attached to “Notice To Manufactures” is more toe than sweet spot SS (intersection when a perpendicular line is dropped from the center of gravity G of the head to the face portion 7a). It is preferably designed to be located on the side.

  By designing the head in this way, it is possible to obtain a high initial velocity while simultaneously obtaining a ball spin in the hook direction and a high launch angle due to the gear effect, so that a large flight distance can be obtained with a high draw type trajectory.

  Further, in the above-described face portion, the upper region of the face portion where the rib 10 is not formed, as shown in FIG. 4, the periphery is a thin portion 7D and the central region is a thick portion 7E. Is preferred.

  By forming the face portion in this way, it is possible to stabilize the variation in launch angle due to slight hitting point blur while obtaining a high launch due to the interaction with the high rigidity by the rib of the face portion.

  According to the golf club having the head 7 configured as described above, the rib 10 is provided on the back side of the face portion 7a, so that as shown in FIGS. 5 (a) and 5 (b), Since the side is difficult to bend and the upper side can be partially deformed, the entire face portion is not bent at the time of hitting the ball, thereby reducing the energy loss and improving the resilience. In addition, since the upper side of the face portion with the vicinity of the upper side of the lateral rib 10a as a fulcrum is easily tilted among the ribs 10, the launch angle is increased by increasing the tilt, and the flight distance can be improved. In this case, by reducing the thickness of the crown portion 7b of the head or lowering the rigidity by making it curved upward, the upper side of the face portion is easily bent at the time of hitting the ball, and the launch angle is increased. It becomes possible. Here, the reduction in rigidity means that the crown part 7b and the sole part 7c are cut from the head body 7A, and the rigidity in the face-back direction of both is compared, the crown part 7b has a lower rigidity than the sole part 7c. It only has to be.

  According to the head having the above-described configuration, the rib 10 is provided on the face portion 7a, so that the degree of freedom in designing the center of gravity and the moment of inertia can be increased. That is, the width of the center of gravity and the moment of inertia design can be expanded by appropriately changing the width and height of the rib 10 and the number and installation positions of the horizontal and vertical ribs. Further, the weight of the portion can be reduced while maintaining the face portion with high rigidity, and the weight can be redistributed to the head.

  6 and 7 are views showing a second embodiment of the present invention. FIG. 6 is a central sectional view of the head, and FIG. 7 is a sectional view taken along the line CC in FIG.

  In this embodiment, as in the first embodiment, when the face member 8 is formed in a predetermined cup shape, the end portion of the rib 10 that is provided integrally with the side portion (the toe in the case of the lateral rib 10a) is formed. Part and / or heel part) and the sole part (in the case of the longitudinal rib 10b), the rib 10 is integrally formed with the side part and the sole part.

  According to such a configuration, the specific rigidity and specific strength below the face portion 7a are further increased, and the entire face portion is more difficult to bend when the ball is hit, and energy loss can be effectively suppressed. It becomes. Further, even if the height and width of the rib 10 are slightly reduced, the same effect as in the first embodiment can be obtained, and the weight corresponding to the reduced rib 10 can be redistributed to the head, and the center of gravity design and inertia moment design can be achieved. The degree of freedom increases.

  Of course, in such a configuration, only one of the horizontal rib 10a and the vertical rib 10b may be configured to reach the side portion or the sole portion. Moreover, in this embodiment, the height of the rib of the horizontal rib 10a is higher than the height of other ribs. By doing in this way, the higher launch angle is attained by the rigidity effect of the horizontal rib 10a.

  8 and 9 are views showing a third embodiment of the present invention. FIG. 8 is a central sectional view of the head, and FIG. 9 is a sectional view taken along the line DD in FIG.

  In this embodiment, the lower side (rib forming region) of the face portion 7a is formed integrally with the head body 7A, and the horizontal rib 10a and the vertical rib 10b are formed integrally therewith. For this reason, the face member 8A is formed to bend toward the rear side in the same manner as in the above-described embodiment so as to constitute a part of the crown portion, the toe portion, and the heel portion. Is not bent and is joined and fixed to a stepped portion 10c formed on the front end side of the lateral rib 10a. In other words, the lateral rib 10a is positioned at the joint that is the lower end edge of the face member 8A, thereby improving the strength of the joint.

  In the above-described configuration, the lower region of the face portion 7a is integrally formed with the head body, and the rib 10 is integrally formed in this portion, so that the specific rigidity and specific strength of the lower region of the face portion 7a are increased. It can be further increased, and the resilience can be improved by reducing the energy loss during hitting. In this case, if the head body and the lower region of the face portion 7a are molded by lost wax casting, a high quality product can be produced at low cost.

  FIG. 10 is a diagram showing a fourth embodiment of the present invention, and is a central sectional view of the head.

  In this embodiment, a protrusion 10d serving as a joint is formed to protrude upward at the tip of the inner extension of the lateral rib 10a in the third embodiment. The position where the protrusion 10d is formed is set so as to be flush with the front opening of the crown portion 7b and the side portion 7d of the head body 7A. For this reason, the face member 8B can be configured in a cup shape as in the first embodiment described above, whereby the joint surface to the head body 7A can be a single surface in contact with the opening 7B. The accuracy at the time of assembly can be improved.

  Further, as shown in this embodiment, the center of gravity and the moment of inertia can be adjusted by forming a curved thinning 10e on the rib 10 (vertical rib 10b). Of course, such adjustment can be performed, for example, by forming holes in the ribs.

  11 and 12 are views showing a fifth embodiment of the present invention. FIG. 11 is a central sectional view of the head, and FIG. 12 is a sectional view taken along line EE of FIG.

  In this embodiment, the periphery of the face portion 7a (crown portion side, side portion side, and rib forming region) is integrally formed with the head main body 7A, and a plate-like face member formed on the face portion 7a by forging or the like. An opening 7B ′ for fitting 8D is formed.

  According to such a configuration, the room for selection of the material for the face member is widened, and at the time of hitting the ball, the bent portion in the face portion is reduced, so that the energy loss is reduced and the resilience can be improved. .

  Also in this embodiment, it is preferable that the periphery of the face member 8D is formed thinner than the central region.

  13 and 14 are views showing a sixth embodiment of the present invention. FIG. 13 is a central sectional view of the head, and FIG. 14 is a sectional view taken along line FF in FIG.

  In this embodiment, the front end side of the sole portion 7c constituting the head body 7A is curved in a substantially vertical direction to integrally form a face member fixing portion 7m for fixing the face member 8E. A horizontal rib 10a and a vertical rib 10b are integrally formed on the portion 7m. As shown in the figure, the face member fixing portion 7m has a central region rising to the position of the lateral rib 10a, and a toe side and a heel side rising to the region of the crown portion, and has a lateral rib 10a and a longitudinal rib 10b. The rib 10 is provided on the back surface of the face member fixing portion 7m integrally formed with the sole portion 7c. Thus, the rib 10 may be integrally formed with the head main body 7A (in this embodiment, the sole portion 7c) excluding the face portion.

  The back surface of the face member 8E is in close contact with the front surface side of the face member fixing portion 7m, so that the lower region of the face member 8E and the head body 7A overlap each other. In this case, the face member 8E and the head main body 7A are fixed by brazing, bonding, or the like, but it is preferable to use a fitting structure with irregularities so as to improve the adhesive strength between them. Specifically, a groove portion 8F is formed around the back surface side of the face portion 8E (along the toe, sole, and heel regions), and a protrusion that fits in the groove portion 8F is formed in the face member fixing portion 7m. 7n is integrally formed, and the face member 8E is fixed to the face member fixing portion 7m by fitting the groove portion 8F and the protruding portion 7n and brazing the both.

  Further, the face member 8E has an upper end edge bent rearward so as to constitute a part of the crown portion, and an end surface thereof is joined to the crown portion 7b. In this case, the face member 8E and the crown portion 7b are fixed by brazing, bonding, or the like, but it is preferable to use a fitting structure with irregularities so as to improve the bonding strength between them. Specifically, the protrusion 8G is formed along the end surface of the face portion 8E, and the groove portion 7p into which the protrusion 8G is fitted is formed integrally with the front end of the crown portion 7b. The face member 8E is fixed to the crown portion 7b by fitting 7p and brazing the both.

  According to the configuration described above, the ribs are formed, so that the same effects as those of the above-described embodiment can be obtained, and the face member 8E and the head main body (sole portion 7c) overlap in the lower region of the face portion 7a. Therefore, a large adhesion region (joining region) can be obtained, and further, the adhesive strength can be improved by the fitting structure with the unevenness, so that the selection range of the material can be widened. That is, by improving the adhesive strength, it is possible to use different materials (different metals), and it is possible to improve the degree of freedom in design.

  Specifically, a high specific strength titanium alloy (for example, Ti-15V-3Cr-3Sn-3Al) is used for the portion (face member 8E) where face deformation is important, and the head body 7A has a low specific gravity, for example, A magnesium alloy or the like can be used. As a result, the entire region other than the upper region of the face portion 7a is covered with the magnesium alloy, and the weight of the entire head can be reduced. In this case, since the magnesium alloy has a lower specific gravity than the titanium alloy, a material having a high specific gravity (tungsten alloy or the like) is used as the balancer 15 at various positions inside the head body (brazing, bonding, welding). , And can be fixed by caulking or the like), and the degree of freedom in designing the center of gravity can be improved. That is, it becomes easy to adjust the position of the center of gravity, thereby making it easier to obtain a high trajectory hit ball and improving the hitting ease.

  Furthermore, by disposing the magnesium alloy in the regions below the crown portion, the side portion, the sole portion, and the face portion, it is possible to improve the head attenuation and to obtain a calm shot feeling. In particular, even when the maximum thickness of the face member made of a titanium alloy is set to 3.0 mm or less, the hitting sound can be effectively suppressed.

  In the above-described configuration, the face member fixing portion 7m on which the rib 10 is formed only needs to be integrally formed with the head main body, and may be partially integrated with the toe portion and the heel portion.

  15 and 16 are views showing a seventh embodiment of the present invention. FIG. 15 is a central sectional view of the head, and FIG. 16 is a sectional view taken along the line GG of FIG.

  In this embodiment, in the face member fixing portion 7m having the rib 10 in the sixth embodiment, a gap portion 7m ′ where the back surface of the face member 8G is not fixed is formed. In this way, by forming the gap 7m ′, the face weight can be reduced and the intended performance can be obtained. Of course, the shape of the gap 7m ′ described above can be modified as appropriate, or a configuration in which a thin-walled portion is partially formed instead of forming such a gap.

  In the present embodiment, the face member 8G is integrally formed with the crown portion 7b by carbon fiber reinforced resin (CFRP), and the area from the lower end to the upper end of the face portion and further to the back portion of the head body 7A is lightweight. It has become. That is, the face member 8G is fixed to the face member fixing portion 7m by bonding or the like in the lower region of the face portion, and is overlapped and bonded to the upper end portion of the back portion 7f at the rear end of the crown portion. It is fastened by etc. Of course, when both are fixed, a fitting structure with irregularities may be used as described above.

  As in this embodiment, by integrally forming the face portion and the crown portion with a carbon fiber reinforced resin, for example, the thickness, the elastic modulus of the reinforcing fiber, and the fiber direction can be appropriately selected. (EI) and strength can be freely designed. In addition, the carbon fiber reinforced resin has high specific strength and specific rigidity, and has no joint portion in the region from the lower end to the upper end of the face portion and further to the back portion. The center of gravity far from the center, the flexibility of the face, and the ease of tilting of the face due to the ease of bending of the crown can be satisfied at the same time. As a result, a high launch angle, a low spin rate, and a fast initial ball speed can be obtained with respect to the hit ball, the flight distance can be improved, and a soft shot feel can be obtained.

  In the above-described configuration, the configuration other than the face portion (sole portion and side portion) can be made of various materials. For example, a titanium alloy (Ti-6Al-4V or the like), a magnesium alloy, an aluminum alloy, stainless steel, a stainless alloy, or the like can be used. Also, the face material formed integrally with the crown portion can be appropriately modified with respect to its constituent material such as a titanium alloy.

  Although the embodiment of the present invention has been described above, the golf club head according to the present invention is provided with the rib 10 on the back side below the face center C of the face portion 7a so as to increase the rigidity of the lower region. What is necessary is just to change the shape of the rib suitably.

  For example, in the rib 20 shown in FIG. 17A, when the one horizontal rib 20a and the four vertical ribs 20b are provided, the horizontal rib 20a is moved from the toe side to the heel side so that the hitting surface on the toe side becomes wider. It is formed to rise toward According to the rib having such a shape, when a miss hit occurs on the toe side, the trajectory can be stabilized without increasing the launch angle. The lateral rib 20a may be formed so as to gradually rise while being bent, as shown in FIG.

  Further, the rib 30 shown in FIG. 17B has the lateral rib 30a in the central region so that the hitting surfaces on the toe side and the heel side are wide when one lateral rib 30a and three longitudinal ribs 30b are provided. Is formed in a curved shape protruding. According to the rib having such a shape, when a miss hit occurs on the toe / heel side, the trajectory can be stabilized without increasing the launch angle.

  Moreover, about the structure which provides multiple vertical ribs, each vertical rib does not need to be formed in parallel. For example, as shown in FIG. 17 (c), a plurality of vertical ribs 40b are inclined to each other and connected to the horizontal rib 40a to form the rib 40, or as shown in FIG. The rib 50 may be configured such that the rib 50b is zigzag with respect to the lateral rib 50a. Alternatively, as in the rib 60 shown in FIG. 17 (f), a large number of horizontal ribs and vertical ribs are formed so as to form a lattice pattern below one horizontal rib 60a extending in the horizontal direction. May be formed. In this case, the shape of the recess formed by the lattice may be a circle, an ellipse or the like in addition to the polygonal shape shown in the figure.

  As described above, by changing the shape of the rib, it is possible to appropriately change the specific strength and specific rigidity of the region below the face portion 7a. Further, the rib may be integrally formed on the back surface of the face portion, or may be integrally formed on the sole portion or the side portion.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st Embodiment of the golf club which concerns on this invention, and is a front view of a golf club. The front view of a head. Sectional drawing along the AA line of FIG. Sectional drawing along the BB line of FIG. (A) And (b) is sectional drawing which shows the deformation | transformation state of the face part at the time of hitting. It is a figure which shows the 2nd Embodiment of this invention, and is center sectional drawing of a head. Sectional drawing along CC line of FIG. It is a figure which shows the 3rd Embodiment of this invention, and is center sectional drawing of a head. Sectional drawing along the DD line | wire of FIG. It is a figure which shows the 4th Embodiment of this invention, and is center sectional drawing of a head. It is a figure which shows the 5th Embodiment of this invention, and is center sectional drawing of a head. Sectional drawing along the EE line | wire of FIG. It is a figure which shows the 6th Embodiment of this invention, and is center sectional drawing of a head. Sectional drawing along the FF line of FIG. It is a figure which shows the 7th Embodiment of this invention, and is center sectional drawing of a head. Sectional drawing along the GG line of FIG. (A)-(f) is a figure which shows the modification of the shape of a rib.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Golf club 5 Shaft 7 Head 7A Head main body 7a Face part 7b Crown part 8 Face members 10, 20, 30, 40, 50, 60 Ribs 10a, 20a, 30a, 40a, 50a, 60a Lateral ribs 10b, 20b, 30b, 40b, 50b Vertical rib G Center of gravity P Reference horizontal plane

Claims (12)

In a golf club comprising a shaft and a head having a hollow structure that is fixed to one end of the shaft at a specified lie angle and loft angle with respect to a reference horizontal plane,
The head includes a face portion having a ball striking surface for hitting a ball, a crown portion, a side portion, and a sole portion,
2. A golf club according to claim 1, wherein a rib projecting toward the center of the head is provided on an inner surface of the face portion below the center portion of the face portion.   The golf club according to claim 1, wherein the rib includes a lateral rib extending along a toe-heel direction and a longitudinal rib extending along a crown / sole direction.   The face portion is provided with a face member to be joined by a joint portion, and the joint portion of the face member is formed on a ball striking surface and is formed at a position where at least the lateral rib is provided. The golf club according to claim 1 or 2.   4. The golf club according to claim 1, wherein the rib is formed integrally with a side portion and / or a sole portion adjacent to the face portion. 5.   The position where the rib is provided is provided in a range of 0.2H to 0.5H, where H is the maximum height of the face portion. Golf club.   2. The head according to claim 1, wherein a position IS at which the repulsion of the face portion in the upper region where no rib is formed is located more toe side than the sweet spot SS. 6. The golf club according to any one of 5 above.   7. The golf according to claim 1, wherein the upper region of the face portion where the rib is not formed has a thick portion at a central portion and a thin portion around the thick portion. club.   The golf club according to claim 1, wherein the crown portion is formed with a lower rigidity than the sole portion. In a golf club comprising a shaft and a head having a hollow structure that is fixed to one end of the shaft at a specified lie angle and loft angle with respect to a reference horizontal plane,
The head includes a face portion having a ball striking surface for hitting a ball, a crown portion, a side portion, and a sole portion,
On the inner side of the face portion, a rib that is integrally formed with a side portion and / or a sole portion adjacent to the face portion and protrudes toward the center of the head is provided below the center portion of the face portion. A featured golf club.   The rib is provided on a face member fixing portion integrally formed with a side portion and / or a sole portion adjacent to the face portion, and the face member is fixed to the face member fixing portion. The golf club according to claim 9, wherein the golf club is provided.   The golf club according to claim 10, wherein a gap is formed in the face member fixing portion.   The golf club according to claim 9, wherein the face member is formed integrally with a crown portion.

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