JP2000024153A - Shaft for golf club made of fiber reinforced resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a carry by increasing a head speed when a golf club mounted with a shaft having a bending rigidity distribution to make the shaft smoothly supple over the entire part of the shaft is swung and increasing the initial flying angle of a ball. SOLUTION: The reinforcing layers 8 at the front end of the shaft for the golf club made of the fiber reinforced resin formed by laminating fiber reinforced resin layers consisting of reinforcing fibers having a modulus of elasticity in tension of 70 to 800 GPa are formed of the fiber reinforced resin layers 5 consisting of carbon fibers having the modulus of elasticity in tension of <=60 GPa. In addition, the fiber reinforced resin layers 5 consisting of the carbon fibers having the modulus of elasticity in tension of <=60 GPa are disposed at the constituting layers of a grip part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club shaft made of a fiber-reinforced resin (hereinafter, simply referred to as a shaft), and more particularly to a bending rigidity of a grip portion which is a front end portion and a rear end portion of the shaft. By setting the optimum value, the blow angle immediately before impact is improved, the initial speed of the ball is efficiently improved, and at the same time, the head speed is improved to increase the flight distance.

[0002]

2. Description of the Related Art In recent years, golf clubs have tended to be lighter and longer. Therefore, the length of the shaft is long and light. Shafts made of fiber reinforced resin are generally used because they are lightweight and have a high degree of freedom in design. The weight reduction of the shaft was realized by using a carbon fiber or the like having a high elastic modulus and a high strength and reducing the thickness thereof. However, as described above, it is easy to be broken due to its small thickness and long length. In particular, the end of the shaft joining the head is frequently broken. Therefore, in order to prevent breakage of the tip of the shaft, the tip has often been reinforced with a reinforcing layer made of a fiber reinforced resin made of a high elastic modulus and high strength reinforcing fiber.

In this case, since the reinforcing layer has an orientation angle of the reinforcing fibers approximated to the axis of the shaft, the bending rigidity at the tip of the shaft increases, and the tip does not bend as designed. Among the functions of the shaft, it was difficult to obtain the effect of increasing the angle at which the ball protruded when hitting the ball. To solve the above-mentioned problem, Japanese Patent Application Laid-Open No. 9-141
As disclosed in Japanese Patent No. 754, a fiber reinforced elastic strength is used without significantly increasing the bending rigidity of the distal end portion by using carbon fiber having an elastic modulus of 5 to 150 GPa as a fiber constituting the reinforcing layer. It is known. In addition, the present applicant uses the carbon fiber as a reinforcing layer at the tip, designs a bending rigidity distribution in a range of 200 mm and 900 mm or more from the tip of the shaft, and flexes the tip appropriately. We also invented a shaft that can hit the upper blow.

[0004]

The elastic modulus is 5-15.
By reinforcing with a reinforcing layer using carbon fiber of 0 GPa, it was possible to impart bending almost as designed to the tip of the shaft. When the ball is hit, the running of the head is felt, and the blow angle immediately before the impact tends to be upper, and the initial speed of the ball is improved, but the head speed is not significantly improved.

Accordingly, the present invention solves the above-mentioned problems and provides a golf club equipped with the shaft as a shaft having a rigidity distribution such that the entire shaft from the tip of the shaft to the grip portion is smoothly bent, particularly a bending rigidity distribution. It is an object of the present invention to provide a golf club shaft made of a fiber-reinforced resin, which increases the head speed when swinging, increases the ball projection angle, increases the flight distance, and is durable.

[0006]

According to one aspect of the present invention, there is provided a golf club shaft formed by laminating a fiber-reinforced resin layer, wherein a tensile elastic modulus is applied to a tip portion and a grip portion of the shaft. This is a golf club shaft made of a fiber-reinforced resin having a configuration in which a fiber-reinforced resin layer using a reinforcing fiber of 150 GPa or less is provided.

According to a second aspect of the present invention, the tensile elastic modulus of 15
The fiber reinforced resin layer using a reinforcing fiber of 0 GPa or less has a configuration according to claim 1, which is disposed in a range from the tip of the shaft to 45% of the entire length and from the grip end of the shaft to 45%. It is a golf club shaft made of fiber reinforced resin.

According to a third aspect of the present invention, in a golf club shaft formed by laminating a fiber reinforced resin layer, the minimum value of the bending stiffness in a range from the tip of the shaft to around 100 mm is 20 N · m ² or less; 400 from grip end
The minimum value of the bending stiffness in the range up to around 70 mm is 70 N · m ²
In the following, the maximum value does not exceed 80 N · m ² , and the shaft for the fiber-reinforced resin wood club has a shaft deflection of 90 to 160 mm.

According to a fourth aspect of the present invention, in a golf club shaft formed by laminating a fiber reinforced resin layer, the minimum value of the bending stiffness in a range from the tip of the shaft to around 100 mm is 20 N · m ² or less, 400 from grip end
The minimum value of the bending stiffness in the range up to around 70 mm is 70 N · m ²
In the following, the maximum value does not exceed 80 N · m ² , and the shaft for a fiber-reinforced resin iron club is configured to have a flexure of 40 to 100 mm.

A fifth aspect of the present invention is a golf club shaft having a fiber reinforced resin layer laminated thereon, wherein a fiber reinforced resin layer using a reinforcing fiber having a tensile elastic modulus of 150 GPa or less is provided at a tip portion and a grip portion of the shaft. in disposed with a shaft, and a minimum value of flexural rigidity in the range from the tip of the shaft to 100mm near 20 N · m ² or less, and lowest values of the flexural rigidity in the range from the grip end to 400mm vicinity 70N m ² or less, the maximum value does not exceed 80 N · m ² , and the fiber reinforced resin wood club shaft is configured to have a shaft deflection of 90 to 160 mm.

According to a sixth aspect of the present invention, a fiber reinforced resin layer is laminated.
A golf club shaft, comprising:
Tensile elastic modulus of 150 GPa or less at the end and grip
Shaft with a fiber reinforced resin layer using different reinforcing fibers
At a distance of about 100 mm from the tip of the shaft.
The minimum value of the range of bending stiffness is 20 Nm^TwoLess than
Flexural rigidity in the range from the lip end to around 400 mm
The minimum value is 70 Nm ^TwoBelow the maximum value is 80Nm^TwoBeyond
And the shaft deflection is 40 to 100 mm
Shaft made of fiber reinforced resin
You.

According to a seventh aspect of the present invention, in a golf club shaft formed by laminating a fiber reinforced resin layer, the maximum value of the bending stiffness in a range from 200 mm to 200 mm from the tip of the shaft is 20 N · m ² or less; 400 from grip end
The minimum value of the bending stiffness in the range up to around 70 mm is 70 N · m ²
In the following, the maximum value does not exceed 80 N · m ² , and the deflection amount of the shaft is 90 to 160 mm.

The invention of claim 8 is a golf club shaft having a fiber reinforced resin layer laminated thereon, wherein the maximum value of the bending stiffness in a range from the tip of the shaft to around 200 mm is 20 N · m ² or less, 400 from grip end
The minimum value of the bending stiffness in the range up to around 70 mm is 70 N · m ²
Hereinafter, a shaft for a fiber-reinforced resin iron club, wherein the maximum value does not exceed 80 N · m ² and the amount of deflection of the shaft is 40 to 100 mm.

According to a ninth aspect of the present invention, there is provided a golf club shaft formed by laminating a fiber reinforced resin layer, wherein a tensile modulus of elasticity of 150 GPa is applied to a tip portion and a grip portion of the shaft.
In a shaft provided with a fiber-reinforced resin layer using the following reinforcing fibers, the maximum value of the bending rigidity in the range from the tip of the shaft to around 200 mm is 20 Nm ² or less, and from the grip end to around 400 mm. maximum bending minimum stiffness in the range of at 70N · m ² or less 80 N · m ²
And the shaft deflection is 90 to 160 mm
A fiber reinforced resin shaft for a wood club.

According to a tenth aspect of the present invention, there is provided a golf club shaft formed by laminating a fiber-reinforced resin layer, wherein a tensile elastic modulus of 150 GP is applied to a tip portion and a grip portion of the shaft.
In a shaft provided with a fiber reinforced resin layer using a reinforcing fiber of a or less, the maximum value of the bending rigidity in a range from the tip of the shaft to around 200 mm is 20 N · m ² or less, and around 400 mm from the grip end. maximum value minimum value of flexural rigidity at 70N · m ² or less in the range until 80 N · m ²
And the shaft deflection is 40 to 100 mm
A shaft for an iron club made of a fiber-reinforced resin.

According to an eleventh aspect of the present invention, in the invention of the seventh or ninth aspect, the bending stiffness distribution in a range from the grip end of the golf club shaft to the vicinity of 400 mm is a graph showing the bending stiffness distribution. minimum value is in the range of 50~70N · m ^2, the graph,
From the 400mm position to the grip end,
A fiber-reinforced resin wood club shaft having a gradient of 5.0N · m ² / 100mm.

The invention of claim 12 is the invention of claim 8 or 10
In the invention described in the above, the bending rigidity distribution in the range from the grip end of the golf club shaft to the vicinity of 400 mm has a minimum value in the range of 50 to 70 N · m ² in a graph showing the bending rigidity distribution. Is
From the 400mm position to the grip end,
A fiber-reinforced resin iron club shaft has a slope of 5.0N · m ² / 100mm.

According to a thirteenth aspect of the present invention, in the invention according to any one of the third to twelfth aspects, 400
a fiber club shaft made of a fiber-reinforced resin, having at least a portion having an outer diameter of 16.0 mm or more between mm or 16.0 mm or more near the grip end. is there.

The invention according to claim 14 is the invention according to claims 1, 2, 5,
13. The golf club shaft according to claim 6, wherein the reinforcing fibers are carbon fibers having a tensile modulus of elasticity of 60 GPa or less.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings, and the present invention will be described in detail. FIG. 2 is an external view of the golf club shaft of the present invention, and FIG. 3 is a diagram illustrating the bending rigidity distribution of the golf club shaft of Example 1 of the present invention and a conventional shaft. FIG. 4 is a diagram illustrating a bending rigidity distribution of a golf club shaft according to another embodiment of the present invention;
Figure 5 shows the stack. It is well known that when a golf club is swung, the bending of the shaft from takeback to impact affects the head speed and the launch angle of a hit ball. Therefore, by making good use of the bending of the shaft, the head speed is increased, and
The launch angle of the ball can be increased (the head runs), and as a result, the flight distance can be increased.

In order to increase the head speed and increase the launch angle of the hit ball, a greater effect can be expected as the amount of change in the bending of the shaft increases. However, the amount of change in the bending only increases (the bending rigidity increases). A (small) shaft is not necessarily good, but it is necessary to design the distribution of the bending stiffness of the shaft to be optimal. As shown in FIG. 2, the shaft 1 is provided to the shaft 1 at a distal end 2 a of the distal end 2 as a distal end 2, a center 3, and a grip 4 on which a head obtained by dividing the shaft 1 into three equal parts is attached.
In particular, the amount of bending change becomes large immediately before the impact due to the bending moment applied to the distal end side 2, and the shaft distal end 2a is determined by the result of the accumulation of the amount of bending change.
Of the ball, and therefore the angle at which the ball protrudes at impact.

As described above, in order to maximize the bending angle of the ball by making full use of the bending of the tip 2a of the shaft 1 at the time of impact, the minimum value of the bending rigidity of the shaft tip 2b is 20 N · m ² or less. It is preferred that
More preferably, the maximum value of the bending stiffness from the shaft tip 2b to the vicinity of 200 mm is 20 N · m ² or less. The tip 2a has a smaller bending stiffness, the larger the amount of change in bending, and the result of accumulation of the amount of change in bending can be used at the time of impact, but it is preferable. The balance with the rigidity deteriorates, the head does not run, and the shaft does not flex smoothly as a whole, so the feeling also worsens, the deflection in the toe-down direction also increases, and the hitting position becomes unstable, so that 10 N · m ² or more It is preferred that

Looking at the grip side 4, the bending moment applied to the shaft while swinging the club differs depending on the power of the swinger and the type of swing. In particular, there is a large difference between the magnitude of the bending moment applied to the grip portion 4a near the top portion of the swing (turn point of the swing) and when the cock is released. That is, if the amount of change in the bending of the grip portion 4a is small, the bending from the central portion 3 of the shaft 1 to the grip portion 4a is difficult to be smooth, and the energy (restoration) due to the bending cannot be used. We cannot expect a rise. Therefore, in order to maximize the energy (restoration) due to the bending of the grip portion 4a at the time of impact and to increase the head speed, the minimum value of the bending rigidity of the grip portion 4a is 70 N · m ² or less.
The maximum value must not exceed 80 N · m ² . Further, preferably, the minimum value of the bending rigidity in the range from the grip end 4b to the vicinity of 400 mm is 50 to 70 N ·
m ² , the maximum value does not exceed 80 N · m ^2, and the bending stiffness distribution in the above range is shown in the graph from the position near 400 mm to the clip end 4 b in the range of 0 to ± 5. it is that it has a gradient of 0N · m ² / 100mm. The maximum value is 400 within the range.
The golf club can be formed according to the head speed, physical strength, and the like of the player by designing the position such as whether it is formed in the vicinity of the mm or the grip end 4b.

In order to increase the energy (restoration) due to bending in order to increase the head speed, it is preferable that the bending rigidity of the grip portion 4a is low. However, if it is too low, the balance with the bending rigidity of the entire shaft is required. worse, since electrode portions to flex without flexing smooth as a whole shaft, the effect of head speed is increased can not be expected so much, also becomes poor feeling during the swing, the range of 50~60N · m ² Preferably, there is.
Furthermore, by setting the outer diameter of the grip portion 4a of the shaft 1 of the present invention to 16.0 mm or more, which is larger than usual, it is easy to control the angle of the face surface of the club head at the time of impact, and to hit the sweet spot. This is preferable because the probability can be improved.
The region where the bending stiffness of the distal end portion 2a of the shaft 1 is reduced is in a range from the shaft distal end 2b to around 100 mm, and the minimum value is 20 N · m ² or less, or the shaft distal end 2b From 200 to 200 mm, the maximum value of which is 20 N · m ² or less, and the range in which the bending stiffness of the grip portion 4 a is reduced is from the grip end portion 4 b to the vicinity of 400 mm, and the minimum value is 70 N · m ^2.・ M ² or less, more preferably 50 to 7
Within the scope of 0N · m ^2, the maximum value does not exceed 80 N · m ^2, can be the effect of the invention more remarkable. The reason for this is that if the area and the range are exceeded, the effect of lowering the bending rigidity extends to the central portion 3 of the shaft 1 and affects the flex of the entire shaft.

The shaft 1 having the structure of the present invention described above
The deflection amount of the whole shaft is 90 to 160 mm for the wood club shaft, and 40 for the iron club shaft.
It is more effective and preferable if it is within the range of 100 mm. Although not shown, the deflection amount of the shaft 1 of the present invention was measured by a flex measurement method approved by the Japan Golf Equipment Association as a completed golf club with a head and a grip attached thereto. Is the amount of deflection of the shaft.

If necessary, according to the present invention, the flexural rigidity of the distal end portion 2a and the grip portion 4a of the shaft 1 is specified, while the flex of the entire shaft is the same as that of the conventional shaft. The swing distance can be increased by increasing the head speed and increasing the angle at which the ball projects while swinging.

It is effective that the shaft 1 of the present invention is formed of a fiber reinforced resin material. The lamination structure of the fiber reinforced resin layer will be described with reference to FIG. The shaft is usually
Generally, it is formed by winding and laminating a fiber reinforced resin prepreg made of reinforcing fibers having a tensile modulus of 70 to 800 GPa around a mandrel. The shaft is generally composed of an oblique layer 6 arranged such that the orientation angle of the reinforcing fibers of the fiber-reinforced resin prepreg is 20 to 60 ° with respect to the shaft length direction, and a straight layer 7 substantially the same as the shaft length direction. Is formed from at least two layers. And the diameter is the thinnest,
Since the load at the time of hitting the ball is large, a reinforcing layer 8 is provided at the tip 2a which is more easily broken than other portions, and the reinforcing effect is emphasized. Therefore, as can be seen from the graph explaining the concept of the bending rigidity distribution of the shaft of FIG.
The bending rigidity distribution on the tip side 2 was not smooth. The outer shape of the shaft is the shaft tip 2b.
Since it has a tapered shape whose diameter increases as it goes to the grip end 4b, the bending rigidity distribution tends to gradually increase as it goes to the grip end 4b.

According to the present invention, the tensile modulus of elasticity is 70 to 800 G.
A golf club shaft made of a fiber-reinforced resin formed by laminating a fiber-reinforced resin layer made of reinforcing fibers of Pa has a tensile modulus of elasticity of 150 GPa on a part of the fiber-reinforced resin layer.
It is a shaft 1 provided with a fiber reinforced resin layer 5 using the following reinforcing fibers. As described above, since the reinforcing layer 8 is generally provided on the distal end portion 2a of the shaft 1, unnecessary bending rigidity of the distal end portion 2a due to the provision of the reinforcing layer 8 is prevented, In order to make the shaft 1 smooth, the shaft 1 of the present invention is formed by forming the reinforcing layer 8 of the tip 2a with a fiber reinforced resin layer 5 made of a reinforcing fiber having a tensile elastic modulus of 150 GPa or less. The bending rigidity of 2a is efficiently reduced. The thickness of the reinforcing layer 8 is constant at a predetermined length from the shaft tip 2b, and gradually becomes thinner at a length greater than 45% of the total length from the shaft tip 2b. By the time, the reinforcing layer 8 has been completed.

In the present invention, if the range in which the reinforcing layer 8 made of reinforcing fibers having a tensile modulus of elasticity of the tip portion 2a of 150 GPa or less exceeds the above range, the weight of the shaft increases,
Since the bending rigidity of the entire shaft increases, it is not preferable because the shaft does not exhibit smooth bending.

As described above, since the outer shape of the normal shaft is tapered, the bending rigidity of the shaft increases toward the grip end 4b. In the shaft 1 of the present invention, the fiber reinforced resin layer 5 made of reinforcing fibers having a tensile elasticity of 150 GPa or less is disposed on the constituent layer of the grip portion 4a, thereby efficiently reducing the bending rigidity of the grip portion 4a. Thus, the bending from the central portion 3 of the shaft to the grip portion 4a is smooth. The fiber reinforced resin layer 5 made of reinforcing fibers having a tensile elasticity of 150 GPa or less has a constant thickness from the grip end 4b to a predetermined length, and the thickness becomes smoother at a length longer than that. The fiber reinforced resin layer 5 is finished up to 45% of the entire length from the grip end 4b.

In the present invention, if the range of disposition of the fiber reinforced resin layer 5 made of reinforcing fibers having a tensile modulus of the grip portion 4a of 150 GPa or less exceeds the above range, the distribution of flexural rigidity of the entire shaft is affected, and Is not preferable because it changes. With the above configuration, the shaft 1 of the present invention can be moved 100
The minimum value of the bending stiffness in the range up to the vicinity of 20 mm is 20 N · m ²
And the minimum value of the bending rigidity in the range from the grip end 4b to the vicinity of 400 mm must be 70 N · m ² or less. Further, the shaft tip 2b
The minimum value of the bending stiffness in the range from
It is preferably in the range of 0 to ²⁰ N · m ² , and more preferably, the minimum value of the bending stiffness in the range from the grip end 4 b to the vicinity of 400 mm is in the range of 50 to 60 N · m ² .

As described above, the shaft 1 of the present invention is designed such that the bending rigidity of the distal end portion 2a and the grip portion 4a of the shaft 1 is lower than that of the conventional shaft.
Since the bending strength of the two parts, particularly the tip 2a, is an important factor leading to breakage of the tip 2a, the bending strength may be equivalent to that of the related art while having the bending rigidity distribution described above. Necessary, therefore, the tensile modulus of 150 GP
It is preferable that the tensile strength of the reinforcing fiber of a or less is 1000 MPa or more.

The tensile modulus used in the present invention is 70 to
As the reinforcing fiber of 800 GPa, glass fiber, aramid fiber, carbon fiber, boron fiber and the like can be used, but carbon fiber is used in consideration of excellent mechanical properties as a fiber-reinforced resin molded product. Is preferred.

The tensile modulus used in the present invention is 150.
As the reinforcing fiber of GPa or less, carbon fiber, glass fiber, aramid fiber, and the like can be used. In order to efficiently form the shaft having bending rigidity of the present invention, preferably, the tensile elastic modulus is 60 GPa or less. The effect of the present invention becomes more remarkable if the carbon fiber is more preferably a carbon fiber having a tensile modulus of elasticity of 30 to 60 GPa. Also,
In order to improve the bending strength, the reinforcing fibers preferably have a tensile strength of 1000 MPa or more. As long as the reinforcing fibers are in the above-mentioned range, glass fibers, aramid fibers, carbon fibers such as polyacrylonitrile and pitch can be used. These reinforcing fibers can be used alone or in combination of two or more.

The matrix resin used in the present invention includes epoxy resin, unsaturated polyester resin,
Phenolic resin, silicone resin, polyurethane resin,
A thermosetting resin selected from a urea resin or the like is used, and usually an epoxy resin is preferably used.

[0036]

Embodiments of the present invention will be described below. [Example 1] A tapered stainless steel mandrel 9 having a mandrel tip outer diameter of 3.4 mm, an outer diameter of a grip end of 14.5 mm, and a length of 1200 mm is shown in FIG.
As shown in the figure, the tensile elastic modulus of the oblique layer 6 is 280 G
A fiber-reinforced resin prepreg 6a made of carbon fiber of Pa,
After winding 6b, the straight layer 7 was constituted by combining a fiber reinforced resin prepreg 5a made of carbon fiber having a tensile modulus of 60 GPa or less and a fiber reinforced resin prepreg 7a made of carbon fiber having a tensile modulus of 280 GPa.

That is, from the grip end 4b,
The boundary between the prepregs 5a and 7a is provided obliquely between 600 mm, and the tensile elastic modulus is 60
A prepreg 5a made of carbon fiber of GPa or less is arranged by cutting the tip obliquely, and a prepreg 7a made of carbon fiber having a tensile modulus of 280 GPa is arranged on the tip side 2 including the remaining portion, and the straight layer 7 is formed. And wound around the oblique layer 6.

Further, the prepregs 6a, 6 made of carbon fibers having a tensile modulus of elasticity of 280 GPa
b, the tensile modulus of elasticity is 60 GPa outside the shaft tip 2b within a range of about 400 mm.
A prepreg 5a made of the following carbon fibers was arranged with the carbon fibers oriented in the 0 ° direction which is the length direction of the shaft. Also, the end 5b of the grip side 4 of the prepreg 5a.
Are cut obliquely so that the distribution of bending stiffness due to the provision of the reinforcing layer 8 becomes smooth.

After the predetermined prepreg was wound as described above, a wrapping tape was wound thereon, and after heating and curing, the wrapping tape was removed and polished to obtain a shaft 10.
For this shaft 10, the shaft ends 2b to 100
When the bending stiffness near mm was measured, the lowest value was 10N.
In · m ^2, at the position of 100mm near a 16N · m ^2, a minimum value was measured flexural rigidity of up to 400mm near from the grip end 4b was 55N · m ^2. The deflection of the shaft 10 was 138 mm. A head and a grip were attached to the shaft 10 formed as described above to obtain a golf club. The golf club was hit by two golfers 10 times each, and the behavior of the head and the ball before and after the shot was shot with a high-speed camera,
The head speed immediately before hitting, the blow angle, and the initial speed of the ball at the time of hitting were measured. The flight distance was also measured at the same time.
Table 1 shows the average value of the measurement results. Example 2 A mandrel 9 made of stainless steel having a mandrel tip outer diameter of 5.1 mm, a grip end having an outer diameter of 15.2 mm, and a length of 1400 mm was provided. As shown in FIG. 5, prepregs 6a and 6b made of carbon fibers having a tensile modulus of elasticity of 280 GPa were wound around the mandrel 9 as the oblique layer 6. Next, as the straight layer 7, a prepreg 5a made of carbon fiber having a tensile elasticity of 60 GPa or less and a prepreg 7a made of carbon fiber having a tensile elasticity of 280 GPa were combined. The straight layer 7 is 400 to 6 from the grip end 4b.
A boundary between the prepregs 5a and 7a is provided obliquely between the prepregs 5a and 5mm.
A prepreg 5a made of carbon fiber of Pa or less is arranged by cutting the tip obliquely, and a prepreg 7a made of carbon fiber having a tensile elasticity of 280 GPa is arranged on the tip side 2 including the remaining portion. This was wound around the outer side of the oblique layer 6. Next, the tensile modulus of the straight layer 71 is 280 GP.
a prepreg 7a made of carbon fiber a and a prepreg 5a made of carbon fiber having a tensile elasticity of 60 GPa or less as the reinforcing layer 8 and having a shaft tip 2b
What is cut diagonally between 0-400mm,
The straight layer 72 was wound in the order of the prepreg 7a made of carbon fiber having a tensile modulus of elasticity of 280 GPa.

After the predetermined prepreg was wound as described above, a wrapping tape was wound thereon and cured by heating. Then, the wrapping tape was removed and polished to obtain a shaft 12 weighing 42 g and having a length of 1169 mm. This shaft 12
Measurement of the flexural rigidity of the tip to 200mm near the minimum value is 10 N · m ^2, a maximum value is in the position of 200mm from the tip, the value was 16N · m ^2. Minimum value was measured flexural rigidity of 400mm to near than the grip end 4b is 58N · m ^2, a maximum value is in the vicinity of the grip end portion 4b, a 65N · m ^2,
The outer diameter near the grip end 4b was 16.2 mm.
The deflection of the shaft 12 was 139 mm. A head and a grip were attached to the shaft 12 formed as described above to obtain a golf club. The golf club was hit by a plurality of golfers 5 to 10 times each, and the head speed and flight distance immediately before hitting were measured. Table 2 shows the average value of the measurement results. [Embodiment 3] A mandrel 9 similar to that of Embodiment 2 is provided with a reinforcing layer 8
A prepreg 5a made of carbon fiber having a tensile elastic modulus of 60 GPa or less, and a prepreg 5a cut obliquely from 100 to 300 mm from the tip 2b of the shaft was used. I got
The weight of the shaft 13 was 42 g and the length was 1169 mm. 200 mm from the tip of this shaft 13
When the bending stiffness in the vicinity was measured, the lowest value was 10 N · m
^{In 2} , the maximum value was at a position 200 mm from the tip, and the value was 15 N · m ² . 40 from grip end 4b
When the bending stiffness was measured to around 0 mm, the lowest value was 5
At 3 N · m ² , the bending rigidity near the grip end 4 b is 57.
N · m ² , and the outer diameter near the grip end 4b is 1
6.2 mm. The deflection of the shaft 13 is 1
37 mm. Shaft 13 formed as described above
A golf club was attached with a head and a grip.
The golf club was hit by a plurality of golfers 5 to 10 times each, and the head speed and flight distance immediately before hitting were measured. Table 2 shows the average value of the measurement results.

COMPARATIVE EXAMPLE The same mandrel as in the example was used, except that the carbon fiber having a tensile modulus of 280 GPa was used instead of the carbon fiber having a tensile modulus of 60 GPa or less.
The shaft 20 of the comparative example was formed in the same specification as the example by molding in the same manner as the example. When the bending stiffness of this shaft from the tip to the vicinity of 200 mm was measured,
The lowest value is 21N · m ^2, the maximum value is 25N · m ^2,
At a position near 100 mm, it was 21 N · m ² . Minimum value was measured flexural rigidity of 400mm near from the grip end 4b flexural rigidity near the grip end portion 4b with 70N · m ² is 130N · m ^2, the grip end portion 4
The outer diameter near b was 15.3 mm. Shaft 2
The deflection amount of 0 was 138 mm. A head and a grip were attached to the shaft 20 formed as described above to obtain a golf club. The golf club was hit by two golfers 10 times each, and the head speed immediately before hitting the ball,
The blow angle and the angle of the ball at the time of hitting were measured with a high-speed camera. Table 1 shows the average value of the measurement results. Separately, the golf club was hit by a plurality of golfers 5 to 10 times each, and the head speed and flight distance immediately before hitting were measured. Table 2 shows the average value of the measurement results.

[0042]

[Table 1] Experimental results of golf clubs Note: Blow angle: The angle between the moving direction of the head and the horizontal line immediately before the ball hits the ball when hitting the ball (+: upper blow,-: down blow)

[0043]

[Table 2] Experimental results of golf clubs

[0044]

According to the golf club shaft of the present invention, since the bending stiffness of the shaft tip and the grip portion is made to be a bending stiffness distribution that makes the shaft smooth, the head speed increases, and The flying distance can be increased by increasing the blowing angle by increasing the blowing angle of the ball when the ball is hit. In addition, the shaft of the present invention has a tensile modulus of 150 GPa at the shaft tip and the grip.
Since the fiber reinforced resin layer made of the following reinforcing fibers is provided, a shaft having a reduced bending rigidity in the above-described portion can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a laminated form of a shaft according to an embodiment of the present invention.

FIG. 2 is an external view of a shaft.

FIG. 3 is a view for explaining the rigidity distribution of the conventional shaft and the shaft according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a rigidity distribution of a shaft according to another embodiment of the present invention.

FIG. 5 is a view for explaining a laminated form of a shaft according to another embodiment 2 of the present invention.

[Explanation of symbols]

 Reference Signs List 1 shaft 2 tip side 2a tip 2b shaft tip 3 center 4 grip side 4a grip 4b grip end 5 fiber reinforced resin layer 5a prepreg 5b end 6 oblique layer 6a prepreg 6b prepreg 7 straight layer 7a prepreg 8 reinforcing layer 9 Mandrel 10 Shaft 11 Shaft 12 Shaft 13 Shaft 20 Conventional Shaft 71 Straight Layer 72 Straight Layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 105: 06 (72) Inventor Hironori Ashita 1-112-35 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Mitsuno Inside the corporation

Claims (14)

[Claims] 1. A golf club shaft having a fiber reinforced resin layer laminated thereon, wherein a fiber reinforced resin layer using a reinforcing fiber having a tensile elasticity of 150 GPa or less is provided at a tip portion and a grip portion of the shaft. A golf club shaft made of fiber reinforced resin. 2. A fiber reinforced resin layer using a reinforcing fiber having a tensile elasticity of 150 GPa or less is provided in a range from the tip of the shaft to 45% of the entire length and from the grip end of the shaft to 45%. The golf club shaft according to claim 1, wherein the golf club shaft is made of a fiber-reinforced resin. 3. A golf club shaft formed by laminating a fiber-reinforced resin layer, wherein the shaft is 100
The minimum value of the bending stiffness in the range up to the vicinity of 20 mm is 20 N · m ²
The minimum value of the bending rigidity in the range from the grip end to the vicinity of 400 mm is 70 N · m ² or less and the maximum value is 8
0N ・ m ² and shaft deflection is 90 ~
A fiber reinforced resin wood club shaft having a length of 160 mm. 4. A golf club shaft formed by laminating a fiber reinforced resin layer, wherein 100
The minimum value of the bending stiffness in the range up to the vicinity of 20 mm is 20 N · m ²
The minimum value of the bending rigidity in the range from the grip end to the vicinity of 400 mm is 70 N · m ² or less and the maximum value is 8
0N ・ m ² and shaft deflection is 40 ~
A shaft for a fiber-reinforced resin iron club, which is 100 mm. 5. A golf club shaft having a fiber reinforced resin layer laminated thereon, wherein a fiber reinforced resin layer using a reinforcing fiber having a tensile elastic modulus of 150 GPa or less is disposed at a tip portion and a grip portion of the shaft. The minimum value of the bending stiffness in the range from the tip of the shaft to the vicinity of 100 mm is not more than 20 N · m ² ,
The minimum value of the bending stiffness in the range up to around 00 mm is 70 N
A fiber reinforced resin wood club shaft characterized in that the maximum value does not exceed 80 N · m ² at m ² or less and the shaft deflection is 90 to 160 mm. 6. A golf club shaft having a fiber reinforced resin layer laminated thereon, wherein a fiber reinforced resin layer using a reinforcing fiber having a tensile elastic modulus of 150 GPa or less is provided at a tip portion and a grip portion of the shaft. The minimum value of the bending stiffness in the range from the tip of the shaft to the vicinity of 100 mm is not more than 20 N · m ² ,
The minimum value of the bending stiffness in the range up to around 00 mm is 70 N
An iron club shaft made of fiber reinforced resin, wherein the maximum value does not exceed 80 N · m ² at m ² or less, and the shaft deflection is 40 to 100 mm. 7. A golf club shaft formed by laminating a fiber reinforced resin layer, wherein 200
The maximum value of the bending stiffness in the range up to about 20 mm is 20 N · m ²
The minimum value of the bending rigidity in the range from the grip end to the vicinity of 400 mm is 70 N · m ² or less and the maximum value is 8
0N ・ m ² and shaft deflection is 90 ~
A fiber reinforced resin wood club shaft having a length of 160 mm. 8. A golf club shaft formed by laminating a fiber reinforced resin layer, wherein 200
The maximum value of the bending stiffness in the range up to about 20 mm is 20 N · m ²
The minimum value of the bending rigidity in the range from the grip end to the vicinity of 400 mm is 70 N · m ² or less and the maximum value is 8
0N ・ m ² and shaft deflection is 40 ~
A shaft for a fiber-reinforced resin iron club, which is 100 mm. 9. A golf club formed by laminating a fiber-reinforced resin layer.
A shaft for a rub, comprising:
Reinforcing fibers with a tensile modulus of elasticity of 150 GPa or less
In the shaft provided with the used fiber reinforced resin layer,
Flexural rigidity in the range from the shaft tip to around 200 mm
The maximum value of the property is 20 Nm^TwoLess than the grip end
The minimum value of the bending stiffness in the range from
N ・ m ^TwoBelow the maximum value is 80Nm^TwoNot exceed
Characterized in that the saft deflection is 90 to 160 mm
Fiber reinforced plastic shaft for wood club. 10. A golf club shaft obtained by laminating a fiber reinforced resin layer, wherein a fiber reinforced resin layer using a reinforcing fiber having a tensile elastic modulus of 150 GPa or less is provided at a tip portion and a grip portion of the shaft. On the shaft,
The maximum value of the bending stiffness in the range from the tip of the shaft to the vicinity of 200 mm is 20 N · m ² or less, and the minimum value of the bending stiffness in the range from the grip end to the vicinity of 400 mm is 7 Nm.
Maximum at 0N · m ² or less does not exceed 80 N · m ^2, and,
A shaft for fiber-reinforced resin iron clubs, wherein the shaft deflection is 40 to 100 mm. 11. A flexural rigidity distribution in a range from the grip end of the golf club shaft to a vicinity of 400 mm has a minimum value in a range of 50 to 70 N · m ² in a graph showing the flexural rigidity distribution. The graph is
From the 400mm position to the grip end,
5.0N · m ² / 100mm fiber reinforced plastic wood club shaft of claim 7 or 9, wherein in that it has a gradient of. 12. The flexural rigidity distribution in the range from the grip end of the golf club shaft to the vicinity of 400 mm has a minimum value in the range of 50 to 70 N · m ² in a graph showing the flexural rigidity distribution. The graph is
From the 400mm position to the grip end,
5.0N · m ² / 100mm fiber reinforced resin iron club shaft of claim 8 or 10, wherein in that it has a gradient of. 13. The fiber reinforced resin golf club shaft according to claim 3, wherein at least a portion having an outer diameter of 16.0 mm or more is provided between the grip end and 400 mm, or A golf club shaft made of a fiber-reinforced resin, wherein an outer diameter near a grip end portion is 16.0 mm or more. 14. The reinforcing fiber has a tensile modulus of 60 GP.
a, a carbon fiber of a or less,
13. The golf club shaft made of a fiber-reinforced resin according to any one of items 2, 5, 6, 9, 10, 11, and 12.