CN215841487U

CN215841487U - Golf club head and golf club

Info

Publication number: CN215841487U
Application number: CN202120186802.1U
Authority: CN
Inventors: 角田幸介
Original assignee: Yamaha Corp
Current assignee: Yamaha Corp
Priority date: 2020-03-24
Filing date: 2021-01-22
Publication date: 2022-02-18
Anticipated expiration: 2031-01-22
Also published as: CN113440817A; KR102561923B1; KR20210119265A; JP2021151295A

Abstract

The utility model aims to provide a golf club head capable of adjusting the hit trajectory to approach the trajectory intended by a player and a golf club provided with the same. A golf club head according to an aspect of the present invention includes: a head main body that can be attached to a shaft; a weight mounting portion provided to the head main body and having a plurality of mounting positions to which weights can be mounted; the plurality of attachment positions are on a path equidistant from a vertical axis passing through a center of gravity of the head main body in a state where the shaft is disposed at a lie angle of 60 °.

Description

Golf club head and golf club

Technical Field

The present invention relates to golf club heads and golf clubs.

Background

As the golf club head, a type capable of changing the weight mounting position is used. The player can adjust the height, the left-right direction and the operability of the batting trajectory by adjusting the balance weight according to the preference of the player.

There has been proposed a golf club head in which a position of a weight member (weight) can be changed at equal intervals from a shaft axis by fixing the weight member to any one of a plurality of mounting positions on an imaginary cylindrical surface around the shaft axis in the golf club head (see japanese patent application laid-open No. 2010-148702).

Patent document 1: japanese patent application laid-open No. 2010-148702

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

In the golf club head, the center of gravity angle can be changed by changing the position of the hammer member, and the angle of the face can be changed by changing the center of gravity angle. However, in this golf club head, there is a possibility that a hitting trajectory (a rotation state) which is not intended by a player may be generated due to a change in the center of gravity angle.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a golf club head capable of adjusting a hitting trajectory to approach a trajectory intended by a player, and a golf club provided with the same.

Technical solution for solving technical problem

In order to solve the above-described problems, a golf club head according to an aspect of the present invention includes a head body attachable to a shaft, and a weight attachment portion provided in the head body and having a plurality of attachment positions to which a weight can be attached, wherein the plurality of attachment positions are on a path equidistant from a vertical axis passing through a center of gravity of the head body in a state where the shaft is provided at a sole angle of 60 °.

Preferably, the counterweight mounting portion has a rail portion that is capable of guiding the counterweight and extends on the path, and the counterweight is movably engaged with the rail portion and is fixable at an arbitrary position of the rail portion.

Preferably, the weight mounting portion includes a plurality of joining portions that are engageable with the weight and are arranged at intervals from each other on the path, and the weight is joined to any one of the plurality of joining portions.

Preferably, in a state where the weight is attached to an arbitrary attachment position in the weight attachment portion and the shaft is disposed at a sole angle of 60 °, an inertia moment about a vertical axis passing through a center of gravity of the head main body is 5500g cm²The above.

Preferably, when the attachment position is changed, a difference between a maximum value and a minimum value of the moment of inertia is within 5% of the minimum value.

Another aspect of the present invention devised to solve the problem described above is a golf club including a shaft, a golf club head attachable to the shaft, and a weight attachable to the golf club head, the golf club head including: a head main body attachable to the shaft; a weight mounting portion provided to the head main body and having a plurality of mounting positions to which the weight can be mounted; the plurality of attachment positions are on a path equidistant from a vertical axis passing through a center of gravity of the head main body in a state where the shaft is disposed at a lie angle of 60 °.

The "lie angle" means an angle of the shaft center axis with respect to a horizontal plane. The "center of gravity of the head body" means the center of gravity of the head body in a state where no weight is attached. "vertical axis" means an axis perpendicular to the horizontal plane. The phrase "the mounting positions are equidistant from the vertical axis" means positions at distances within 5% from the vertical axis, in addition to positions at substantially equal distances from the vertical axis.

Effect of the utility model

In the golf club head according to the present invention, the mounting position is set at an equal distance from the vertical axis passing through the center of gravity, so that the center of gravity angle can be changed while suppressing a change in moment of inertia, and the hitting trajectory can be adjusted to a trajectory close to the trajectory intended by the player. Since the golf club head is provided, the hitting trajectory of the golf club according to the present invention can be adjusted to a trajectory close to the trajectory intended by the player, as in the above case.

Drawings

Fig. 1 is a schematic perspective view showing a state in which a golf club head according to a first embodiment of the present invention is disposed at a sole angle of 60 °.

Fig. 2 is a schematic top view of the golf club head of fig. 1 as viewed from above in fig. 1.

Fig. 3 is a schematic diagram for explaining the center of gravity angle.

Fig. 4 is a schematic plan view of a golf club head according to a third embodiment of the present invention, as viewed from the same direction as the lower side of fig. 1.

Fig. 5 is a schematic plan view of a golf club head according to a fifth embodiment of the present invention, as viewed from the same direction as fig. 2.

Fig. 6 is a schematic plan view of a golf club head according to a seventh embodiment of the present invention, as viewed from the same direction as fig. 4.

Description of the reference numerals

1. 1 ', 20' … golf club head; 2 … head main body; 3 … face of the rod; 4 … at the bottom of the rod; 5 … crown; 6 … shaft hole; 7 … neck of rod; 10. 30 … weight mounting portion; 11 … guide rail parts; 11a … bottom face; 11b … side face portions; 13 … engagement slot; a 31 … joint; 31a … bottom surface portion; 31b … side surface portions; 31c … threaded bore portion; 40. 45 … weight; 40a … body portion; 40b … engagement tab portion; 40c … first fixed part; 45a … body portion; 45b … second fastening portion; 50 … shaft; the center of gravity of the head main body in the state where no weight is attached to G1 or G2 …; l1, L2 … vertical axis; the P1, P2 … paths; s … a central axis of the shaft; r … distance (radius); theta … center of gravity angle.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, a wood-type golf club head is exemplified as the golf club head, but the golf club head may be an iron-type golf club head, a hybrid-type (ironwood-type) golf club head, or the like.

[ first embodiment ]

< Golf club head >

Fig. 1 and 2 show a golf club head 1 according to an embodiment of the present invention.

As shown in fig. 1, the golf club head 1 includes: a head main body 2 attachable to a shaft 50; and a weight mounting portion 10 provided in the head main body 2 and having a plurality of mounting positions to which weights 40 can be mounted. The golf club head 1 further includes a weight 40. The golf club head 1 further includes a first filling member (not shown). Fig. 1 shows a state in which the golf club head 1 is attached to a shaft 50.

Fig. 1 schematically shows the golf club head 1 in a state where the shaft 50 is provided at a sole angle of 60 °, that is, in a state where an angle of a center axis S (see fig. 3) of the shaft 50 with respect to a horizontal plane is 60 °. Fig. 2 schematically shows the golf club head in the state shown in fig. 1 from above in fig. 1.

(head main body)

The head main body 2 can be attached to the shaft 50. The head body 2 includes a face portion (striking surface) 3, a sole portion (sole surface) 4, a crown portion (upper surface) 5, and a hosel portion 7, and the hosel portion 7 includes a shaft hole 6 into which the shaft 50 is inserted and fixed. In the present embodiment, the weight attaching portion 10 is provided to the crown portion 5 of the head body 2.

Examples of the material of the head body 2 include stainless steel, titanium alloy, aluminum alloy, and tungsten. Further, a part of the head main body 2 may be formed of different materials.

(counter weight mounting part)

As shown in fig. 1 and 2, in the present embodiment, the weight attaching portion 10 is provided in the crown portion 5 of the head main body 2. In a state where the shaft 50 is set at a lie angle of 60 ° (the state of fig. 1), the weight attachment portion 10 is on a path P1 equidistant from a vertical axis L1 passing through the center of gravity G1 of the head body 2. The center of gravity G1 is the center of gravity of the head main body 2 in a state where the weight 40 is not attached to the head main body 2.

In the present embodiment, the weight mounting portion 10 has the rail portion 11 extending on the path P1 and capable of guiding the weight 40, and the weight 40 is movably joined to the rail portion 11 and can be fixed to an arbitrary position of the rail portion 11.

The guide rail portion 11 is formed in a groove shape in the crown portion 5 of the head main body 2 so as to have a concave cross section, and as described above, in a state where the golf club head 1 is provided at a sole angle of 60 °, the guide rail portion has an arc shape centered on the center of gravity G1 in a plan view. As shown in fig. 2, the rail portion 11 includes a bottom surface portion 11a extending along the longitudinal direction (extending direction of the arc) and two side surface portions 11b extending upward (for example, perpendicular to the bottom surface portion 11a) and along the longitudinal direction from both ends of the bottom surface portion 11a in the width direction (direction perpendicular to the longitudinal direction, that is, radial direction of the arc). The two side surface portions 11b are arranged parallel to each other.

In fig. 2, the bottom surface portion 11a (i.e., the rail portion 11) has a circular arc shape centered on the center of gravity G1 at the center in the width direction (radial direction) in a plan view. The locus drawn at the center in the width direction is a path P1, and the distance between the vertical axis L1 and the path P1 corresponds to the radius R of the arc. When the radius of the path P1 is R [ mm ] and the width of the rail part 11 is X [ mm ], the radii of both widthwise end edges (radially outer end edge and radially inner end edge) of the rail part 11 become a length (R + X/2) of 1/2 length with respect to R plus the width X of the rail part 11 and a length (R-X/2) of 1/2 length minus the width X of the rail part 11.

As described above, the case where the path P1 is located at the same distance from the vertical axis L1 includes the case where the center position in the width direction (radial direction) of all the guide rail portions 11 included in the path P1 is located at the completely same distance from the vertical axis L1, and also includes the case where any of the center positions in the width direction in the path P1 is located at a different distance within 5% from the vertical axis L1.

The side surface portions 11b are respectively formed with engagement grooves 13 extending in the longitudinal direction. These engaging grooves 13 are formed in parallel with the bottom surface portion 11 a. These engagement grooves 13 are engaged with respective engagement piece portions 40b of the counterweight 40 described later, and are formed so as to be able to guide the counterweight 40 in the longitudinal direction.

< weight >

The counterweight 40 is used to adjust the center of gravity angle. The weight 40 can be attached to a weight attachment portion 10, here, a rail portion 11 provided in the head main body 2. The counterweight 40 has a main body 40a serving as a main body thereof, two engagement piece portions 40b engageable with the respective engagement grooves 13 of the both side surface portions 11b of the rail portion 11, and a first fixing portion 40c for fixing the main body 40a to the rail portion 11.

The main body 40a is formed to be slidable on both side surface portions 11b of the rail portion 11. The main body 40a is formed with a screw hole through which the first fixing portion 40c can be screwed.

The respective engagement piece portions 40b are formed to project from the main body portion 40 to both outer sides in a direction perpendicular to the longitudinal direction in plan view, and are engageable with and guided by the respective engagement grooves 13 of the both side surface portions 11b of the rail portion 11.

The first fixing portion 40c is formed by, for example, a screw (male screw) having a flat portion at the tip. The first fixing portion 40c is screwed into and penetrates the screw hole of the main body portion 40 a. The first fixing portion 40c is screwed so that the tip thereof presses the bottom surface portion 11a of the rail portion 11, and the respective joint piece portions 40b are fixed to the respective joint portions 31b by the pressing (the counterweight 40 is fixed to the rail portion 11).

It is preferable that the density of the weight 40 is greater than that of the head main body 2. By making the density of the weight 40 larger than that of the head main body 2, the amount of change in the center of gravity angle when changing the attachment position of the weight 40 can be further increased. Since the plurality of mounting positions of the counterweight 40 are located on the path P1, even when the amount of change in the center of gravity angle is large, it is possible to suppress a change in the moment of inertia due to a change in the mounting position.

< first filling means >

Preferably, the golf club head 1 further includes a first filling member (not shown) for filling a region of the rail portion 11 where the weight 40 is not mounted, and the first filling member has a mass smaller than that of the weight 40. The specific gravity of the first filling member is preferably equal to or less than the specific gravity of the head body 2. For example, when the material forming the head main body 2 is titanium, examples of the material forming the first filling member include resin, magnesium, and aluminum in addition to titanium.

By filling the first filling member in the region of the rail portion 11 where the counterweight 40 is not mounted, it is possible to suppress the entry of dust, dirt, and the like from the outside environment into the rail portion 11. Further, since the first filler is lighter than the weight 40, the influence of the first filler on the moment of inertia can be reduced.

The length, width, and depth of the rail portion 11 are not particularly limited and can be set as appropriate. For example, the dimensions of the rail portion 11 can be appropriately set so as to obtain a desired amount of change in the center of gravity angle.

< adjustment of center of gravity Angle >

For example, as shown in fig. 3, in the golf club head 1 in a state in which the shaft 50 is attached and the weight 40 is not attached, when the shaft 50 is horizontally supported in a state in which the golf club head 1 is rotatable about the shaft 50, an angle formed by an imaginary straight line in a vertical direction passing through the center axis S and an extending direction of the face portion 3 (face) when viewed from the center axis S direction of the shaft 50 is a center of gravity angle θ. At this time, the center of gravity G1 of the golf club head 1 in the state where the weight 40 is not attached is located on the virtual straight line in the vertical direction. In general, since the face portion 3 is not flat, the extending direction of the face portion 3 is based on the tangential direction of the front edge of the center of the face 3 (the extending direction of the face portion 3).

From this state, the counterweight 40 is inserted into the guide rail portion 11, and the respective engagement piece portions 40b of the counterweight 40 are inserted into the respective engagement grooves 13 of the respective side surface portions 11 b. Thereby, in the rail portion 11, the respective engagement piece portions 40b are guided by the respective engagement grooves 13, and the counterweight 40 is attached movably (positionally changeable) in the longitudinal direction of the rail portion 11. The respective engagement piece portions 40b are engaged with the respective engagement grooves 13 of the rail portion 11 and the counterweight 40 is inserted into the rail portion 11, whereby the counterweight 40 can move in the rail portion 11 without falling off from the rail portion 11.

Next, the counterweight 40 is moved to an arbitrary attachment position in the rail portion 11, and the counterweight 40 is fixed at the position by screwing the first fixing portion 40 c. Since the position of the center of gravity of the golf club head 1 (the center of gravity after the weight 40 is attached) changes from the state shown in fig. 3 according to the attachment position (not shown), the center of gravity angle θ also changes according to the change.

On the other hand, since the first fixing portion 40c tightened is loosened from the state where the counterweight 40 is attached in this way to release the fixation of the counterweight 40, the counterweight 40 can move in the rail portion 11. The counterweight 40 is moved to an arbitrary attachment position different from the current attachment position, and the counterweight 40 is fixed again by screwing the first fixing portion 40 c. The position of the center of gravity of the golf club head 1 (the center of gravity of the golf club head with the weight 40 attached) changes with the change in the attachment position of the weight 40, and the center of gravity angle θ changes with the change.

In the present embodiment, the mounting position of the counterweight 40 to the guide rail portion 11 is on the path P1 that is equidistant (radius R) from the vertical axis L1 passing through the center of gravity G1, and when the mounting position of the counterweight 40 is changed to change the center of gravity angle θ, the change in the moment of inertia can be reduced.

In a state where the weight 40 is attached to the weight attachment portion 10 (here, the rail portion 11) at an arbitrary attachment position and the shaft 50 is disposed at a sole angle of 60 °, the lower limit of the moment of inertia about the vertical axis L1 passing through the center of gravity G1 of the head main body 2 is preferably 5500G cm²More preferably 5700 g.cm²More preferably 5800 g.cm². If the moment of inertia does not satisfy the lower limit, the reduction width of the flight distance at the time of an off-center hit increases, and as a result, the miss performance of the head main body 2 may be poor. On the other hand, the larger the moment of inertia, the better, and the upper limit thereof is not particularly limited. The upper limit of the inertia moment may be limited by an appliance rule or the like, for example. In such a case, the upper limit of the moment of inertia may be set appropriately according to an appliance rule or the like. For example, the upper limit of the moment of inertia is set to 5900+100 g-cm in the appliance rule²(i.e., 6000 g. cm)²) In the case of (3), in order to comply with the appliance rule, the upper limit of the inertia moment can be set to 6000g · cm in accordance with the appliance rule²。

The difference between the maximum value and the minimum value of the moment of inertia when the attachment position is changed is preferably within 5%, more preferably within 3%, and even more preferably within 2% of the minimum value. When the difference exceeds the above range, the inertial moment may be smaller than the other mounting positions among the plurality of mounting positions, and when the weight 40 is placed at the mounting position, the flight distance at the time of the off-center hit may be decreased to a larger extent, and as a result, the miss-hit resistance of the head main body 2 may be poor.

< advantage >

In the golf club head 1, the weight 40 is attached at an equidistant position (here, radius R) from the vertical axis L1 passing through the center of gravity G1, and when the weight 40 is attached at a different position to change the center of gravity angle θ, the change in the moment of inertia before and after the change can be reduced. Therefore, the golf club head 1 can adjust the trajectory of the shot to approach the trajectory intended by the player.

[ second embodiment ]

< Golf club >

The golf club of the present embodiment includes the shaft 50 and the golf club head 1. The shaft 50 is not particularly limited, and a conventionally known shaft 50 can be used. The golf club head 1 is as described above. Therefore, a detailed description of the golf club of the present embodiment is omitted.

< advantage >

The golf club according to the present embodiment is provided with this golf club head 1, and as described above, the trajectory of the hit ball can be adjusted to approach the trajectory intended by the player.

[ third embodiment ]

Fig. 4 shows a golf club head 1' according to another embodiment of the present invention. The golf club head 1' includes: a head main body 2 which can be attached to a shaft 50 (see fig. 1); and a weight mounting portion 10 provided to the head main body 2 and having a plurality of mounting positions for mounting a weight 40. The golf club head 1' further includes a weight 40. The golf club head 1' further includes a first filling member (not shown).

In the golf club head 1' of the present embodiment, the weight attaching portion 10 is provided at the sole portion 4 of the head body 2. The other structure is the same as that of the first embodiment. Therefore, a detailed description of the golf club head body 1' is omitted.

< advantage >

In the golf club head 1', the weight 40 is attached at an equidistant position (here, radius R) from the vertical axis L1 passing through the center of gravity G1, and when the weight 40 is attached at a different position to change the center of gravity angle θ, the change in the moment of inertia before and after the change can be reduced. Therefore, the golf club head 1' can adjust the trajectory of a shot to approach the trajectory intended by a player.

[ fourth embodiment ]

< Golf club >

The golf club of the present embodiment includes the shaft 50 and the golf club head 1'. The shaft 50 is not particularly limited, and a conventionally known shaft 50 can be used. The golf club head 1' is as described above. Therefore, a detailed description of the golf club of the present embodiment is omitted.

< advantage >

The golf club according to the present embodiment includes this golf club head 1', and as described above, the trajectory of the shot can be adjusted to approach the trajectory intended by the player.

[ fifth embodiment ]

< Golf club head >

Fig. 5 illustrates another embodiment of a golf club head 20 of the present invention. The golf club head 20 includes: a head main body 2 which can be attached to a shaft 50 (see fig. 1); and a weight mounting portion 30 provided in the head main body 2 and having a plurality of mounting positions for mounting weights 45. The golf club head 20 further includes a weight 45. The golf club head 20 further includes a second filling member (not shown).

Fig. 5 schematically illustrates the golf club head 20 from above in a state where the shaft 50 is disposed at a lie angle of 60 °, that is, in a state where the center axis S (see fig. 3) of the shaft 50 is disposed at an angle of 60 ° with respect to the horizontal plane, as in fig. 1.

(head main body)

In the present embodiment, the weight attaching portion 30 is provided to the crown portion 5 of the head body 2. The other configurations of the head body 2 are the same as those of the first embodiment, and therefore the same configurations are denoted by the same reference numerals and the description thereof is omitted.

(counter weight mounting part)

In the present embodiment, the crown portion 5 of the head body 2 is provided with the weight attachment portion 30. In a state where the shaft 50 is disposed at a lie angle of 60 ° (see fig. 1), the weight attachment portion 30 is located on a path P2 that is equidistant from a vertical axis L2 passing through the center of gravity G2 of the head body 2. The center of gravity G2 is the center of gravity of the head main body 2 in a state where the head main body 2 is not attached with the weight 45.

In the present embodiment, the weight mounting portion 30 includes the plurality of joining portions 31 that are engageable with the weight 45 and are disposed at intervals from each other on the path P2, and the weight 45 is joined to any one of the plurality of joining portions 31.

In the present embodiment, a plurality of engaging portions 31 are formed in the crown portion 5 of the head main body 2. Each of the plurality of joining portions 31 may be joined to the weight 45, and is not particularly limited. For example, the plurality of engaging portions 31 are formed in a recessed hole shape. As described above, the plurality of joint portions 31 are formed to be arranged on the circular arc-shaped locus centered on the center of gravity G2 in a plan view in a state where the golf club head 20 is set at the sole angle of 60 °. The joint portion 31 has: for example, a bottom surface portion 31a having a circular shape, a polygonal shape, or the like (circular shape in fig. 5) in a plan view; a side surface portion 31a extending upward (for example, perpendicular to the bottom surface portion 31 a) from the periphery of the bottom surface portion 31 a; and a threaded hole 31c formed in the bottom surface 31 a. The respective joint portions 31 are formed in the same shape and the same size.

In fig. 5, the plurality of joint portions 31 are arranged such that the centers (radial centers) thereof draw an arc shape centered on the center of gravity G2 in a plan view. The centers describe a path P2, and the distance between the vertical axis L2 and the path P2 corresponds to the radius R. Thus, if the radius of the path P2 is R [ mm ], and the width (diameter in fig. 5) of each joint 31 in the radial direction is X [ mm ], the radius of the arc drawn by the end edge (radially outer end edge) of each joint 31 farthest from the center of gravity G2 is R plus the length (R + X/2) of 1/2 of the width X of the joint 31, and the radius of the arc drawn by the end edge (radially inner end edge) of each joint 31 closest to the center of gravity G2 is R minus the length (R-X/2) of 1/2 of the width X of the joint 31.

As described above, the position of the path P2 equidistant from the vertical axis L2 includes the case where the center positions of all the joints 31 included in the path P2 are located at a completely equal distance from the vertical axis L2, and the center position of any joint 31 in the path P2 is located at a position at a distance within 5% from the vertical axis L2.

(counter weight)

The counterweight 45 is used to adjust the center of gravity angle. The weight 45 can be attached to the weight attachment portion 30, here, the plurality of joint portions 31 provided in the head main body 2. In the present embodiment, the weight 45 is attached to different joining portions 31 among the plurality of joining portions 31, and can be fixed at an arbitrary position. The weight 45 has a body portion 45a constituting a main body of the weight 45 and a second fixing portion 45b for fixing the body portion 45a to either of the joint portions 31.

The body portion 45a is formed to be insertable into the joint portion 31. The body portion 45a is formed with a screw hole through which the second fixing portion 45b can be screwed.

The second fixing portion 45b is formed by, for example, a screw portion (male screw) that can be screwed into the screw hole portion 31c of the joint portion 31. The second fixing portion 45b is screwed into and penetrates the screw hole of the main body portion 45 a. The second fixing portion 45b is formed so that the weight 45 is fixed to any of the joint portions 31 by being screwed into the screw hole portion 31c of the joint portion 31.

As in the first embodiment, the density of the weight 45 is preferably higher than that of the head main body 2. By making the density of the weight 45 larger than the density of the head main body 2, the amount of change in the center of gravity angle when changing the attachment position of the weight 45 can be further increased. Since a plurality of mounting positions of the counterweight 45 are on the path P2, even when the amount of change in the center of gravity angle is large, it is possible to suppress a change in the moment of inertia due to the change in the mounting position.

(second filling member)

The golf club head 20 further includes a second filling member that fills the joint 31 where the weight 45 is not attached among the plurality of joints 31, and the mass of the second filling member is preferably smaller than the mass of the weight 45. The specific gravity of the second filling member is preferably equal to or less than the specific gravity of the head body 2. For example, when the material forming the head body 2 is titanium, examples of the material forming the second filling member include resin, magnesium, and aluminum in addition to titanium.

By filling the second filling member into the region where the weight 45 is not mounted in the plurality of joint portions 31, it is possible to suppress the entry of dust, dirt, and the like from the external environment into the joint portions 31. Further, since the second filler is lighter than the weight 45, the influence of the second filler on the moment of inertia can be reduced.

The size, depth, number, interval, and the like of the plurality of joining portions 31 are not particularly limited and can be set as appropriate. For example, they can be set as appropriate in order to obtain a desired amount of change in the center of gravity angle.

< adjustment of center of gravity Angle >

As in the case of the foregoing first embodiment, the center of gravity angle can be changed by changing the mounting position of the counterweight 45 in the counterweight mounting portion 30.

In the present embodiment, the weight 45 is inserted into any one of the joining portions 31 of the plurality of joining portions 31, and the second fixing portion 45b of the weight 45 is screwed into the threaded hole portion 31c of the joining portion 31, whereby the weight 45 can be attached to the joining portion 31. The position of the center of gravity of the golf club head 20 (the center of gravity after the weight 45 is attached) changes (not shown) with the attachment position from the state shown in fig. 3, and the center of gravity angle θ changes with this change.

On the other hand, the tightened second fixing portion 45b is loosened from the state in which the counterweight 45 is attached, the counterweight 45 is released from the fixation, and the counterweight 45 is removed so as to be movable. The counterweight 45 is re-fixed by inserting the counterweight 45 into any of the joint portions 31 at a mounting position different from the conventional mounting position and tightening the second fixing portion 45 b. The position of the center of gravity of the golf club head 20 (the center of gravity of the golf club head with the weight 45 attached) changes with the change in the attachment position of the weight 45, and the center of gravity angle θ changes with the change.

In the present embodiment, the counterweight 45 is mounted at an equidistant position (radius R) from the vertical axis L2 passing through the center of gravity G2 with respect to the positions of the plurality of joints 31, and when the mounting position of the counterweight 45 is changed to change the center of gravity angle θ, the change in the moment of inertia can be reduced.

In the present embodiment, similarly to the first embodiment, in a state where the weight 45 is attached to any one of the weight attaching portions 30 (here, the plurality of joint portions 31) and the shaft 50 is disposed at the lie angle of 60 °, the lower limit of the moment of inertia about the vertical axis L2 passing through the center of gravity G2 of the head main body 2 is preferably 5500G · cm²More preferably 5700 g.cm²More preferably 5800 g.cm². If the inertia moment does not satisfy the lower limit, the drop width of the flight distance at the time of the off-center hit increases, and as a result, the miss performance of the head main body 2 may be poor. On the other hand, the larger the moment of inertia, the better, and the upper limit thereof is not particularly limited. The upper limit of the moment of inertia may be limited by, for example, an appliance rule. In such a case, the upper limit of the moment of inertia may be set appropriately according to an appliance rule or the like. For example, according to the rule of the appliance, the upper limit of the moment of inertia is set to 5900+100 g-cm²(i.e., 6000 g. cm)²) In the case of (3), in order to comply with the appliance rule, the upper limit of the moment of inertia is set to 6000g · cm in accordance with the appliance rule²。

In the present embodiment, as in the first embodiment, when the attachment position is changed, the difference between the minimum value and the maximum value of the moment of inertia is preferably within 5%, more preferably within 3%, and still more preferably within 2% of the minimum value. When the difference exceeds the above range, the inertial moment may be smaller than the other mounting positions among the plurality of mounting positions, and when the weight 45 is mounted at the mounting position, the range of decrease in the flight distance at the time of the off-center hit becomes large, and as a result, the miss-hit resistance of the head main body 2 may be poor.

< advantage >

In the golf club head 20, the attachment position of the weight 45 is equidistant (radius R here) from the vertical axis L2 passing through the center of gravity G2, and when the attachment position of the weight 45 is changed to change the center of gravity angle θ, the change in the moment of inertia before and after the change can be reduced. Therefore, the golf club head 20 can adjust the trajectory of the shot to approach the trajectory intended by the player.

[ sixth embodiment ]

< Golf club >

The golf club of the present embodiment includes the shaft 50 and the golf club head 20. The shaft 50 is not particularly limited, and a conventionally known shaft 50 can be used. The golf club head 20 is as previously described. Therefore, a detailed description of the golf club of the present embodiment is omitted.

< advantage >

The golf club according to the present embodiment is provided with this golf club head 20, and as described above, the trajectory of the shot can be adjusted to approach the trajectory intended by the player.

[ seventh embodiment ]

Fig. 6 illustrates another embodiment of a golf club head 20' of the present invention. The golf club head 20' includes: a head main body 2 which can be attached to a shaft 50 (see fig. 1); and a weight mounting portion 30 provided in the head main body 2 and having a plurality of mounting positions for mounting weights 45. The golf club head 20' is further provided with a weight 45. The golf club head 20' further includes a second filling member (not shown).

In the golf club head 20' of the present embodiment, the weight mounting portion 30 is provided at the sole portion 4 of the head body 2. The configuration other than this is the same as that of the fifth embodiment. Therefore, a detailed description of the golf club head body 20' is omitted.

< advantage >

In the golf club head 20', the weight 45 is attached at an equidistant position (here, radius R) from the vertical axis L2 passing through the center of gravity G2, and when the weight 45 is attached at a different position to change the center of gravity angle θ, the change in the moment of inertia before and after the change can be reduced. Therefore, the golf club head 20' can adjust the trajectory of the shot to approach the trajectory intended by the player.

[ eighth embodiment ]

< Golf club >

The golf club of the present embodiment includes the shaft 50 and the golf club head 20'. The shaft 50 is not particularly limited, and a conventionally known shaft 50 can be used. The golf club head 20' is as previously described. Therefore, a detailed description of the golf club of the present embodiment is omitted.

< advantage >

The golf club according to the present embodiment includes the golf club head 20', and as described above, the trajectory of the shot can be adjusted to be close to the trajectory intended by the player.

[ other embodiments ]

The embodiment is not intended to limit the structure of the present invention. Therefore, the embodiments may omit, replace or add components of the respective portions of the embodiments based on the description of the present specification and the common technical knowledge, and they should be construed as belonging to the scope of the present invention.

For example, in the first to fourth embodiments, the description has been given of the case where the counterweight 40 is movable without coming off the rail portion 11 by the engagement of the engagement grooves 13 of the rail portion 11 and the engagement piece portions 40b of the counterweight 40, but the method of movably attaching the counterweight 40 to the rail portion 11 is not particularly limited to the above embodiments. Further, a method of fixing the counterweight 40 to an arbitrary attachment position of the guide rail portion 11 is not particularly limited.

For example, in the fifth to eighth embodiments, the case where the screw hole portion 31c and the second fixing portion 45b are screwed together is used as the joining of the joining portion 31 and the weight 45, but the joining method of the joining portion 31 and the weight 45 is not particularly limited to the above embodiments.

In the first embodiment, the case where the golf club head is attached to a shaft has been described, but the golf club head may be attached to a shaft or may be in a state before the attachment.

Industrial applicability

The golf club head and the golf club of the present invention can adjust the trajectory of a shot to approach the trajectory intended by a player. Therefore, they can be used as various golf club heads and golf clubs having excellent operability.

Claims

1. A golf club head is provided with:

a head main body that can be attached to a shaft;

a weight mounting portion provided in the head main body and having a plurality of mounting positions at which weights can be mounted; the golf club head is characterized in that,

the plurality of attachment positions are on a path equidistant from a vertical axis passing through a center of gravity of the head main body in a state where the shaft is disposed at a lie angle of 60 °.

2. The golf club head of claim 1,

the counterweight mounting portion has a guide rail portion capable of guiding the counterweight and extending on the path,

the counterweight is movably engaged with the rail portion and can be fixed at an arbitrary position of the rail portion.

3. The golf club head of claim 1,

the counterweight mounting portion has a plurality of engaging portions engageable with the counterweight and arranged at intervals from each other on the path,

the weight is engaged with any one of the plurality of engagement portions.

4. The golf club head of any of claims 1-3,

an inertia moment about a vertical axis passing through a center of gravity of the head body is 5500 g-cm in a state where the weight is attached to an arbitrary attachment position in the weight attachment portion and the shaft is disposed at a sole angle of 60 degrees²The above.

5. A golf club comprising a shaft, a golf club head attachable to the shaft, and a weight attachable to the golf club head,

the golf club head has:

a head main body attachable to the shaft;

a weight mounting portion provided to the head main body and having a plurality of mounting positions to which the weight can be mounted;