JP2000264006A - Wheel hub - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel hub capable of reducing a breakage accident of a wheel spoke while controlling an increase in wheel weight and a rise in production cost of a wheel. SOLUTION: A piercing direction 64 of a spoke locking part 32h forming a piercing hole 32f in a cylinder part 32b is set in a direction 21 nearly transverse to a hub axis 22 itself. Thereby, when a stretching direction 45 of a spoke 44 is in the outside direction of a tangent 41 of circumferences 40, 42 forming the spoke locking part 32h, an angle of the piercing direction 64 with the stretching direction 45 of the spoke 44 can be set in an obtuse angle. Then a stress concentration level and a work hardening level at an inside 44c of a bent part of the spoke can be relaxed. Consequently, a breakage accident of the spoke 44 can be reduced without using spokes having a thick size or a step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hub for a wheel, and more particularly to a technique for reducing breakage of a spoke for a wheel.

[0002]

2. Description of the Related Art A hub is known as a component constituting a central portion of a wheel used for a vehicle such as a bicycle. FIG.
FIG. 1 shows an example of the configuration of a conventional hub 2. This hub 2
A hub used for the rear wheel of a bicycle. The hub 2 includes a hub body 10 supported rotatably with respect to the hub shaft 4. That is, the hub body 10 is connected to the hub axle 4 via the pair of ball pushing bodies 6 fixed to the hub axle 4 and the plurality of steel balls 8.
Are supported so as to be immovable in the axial direction and rotatable around the axis.

[0003] The hub body 10 includes a pair of hub flange bodies 12, a pair of bowl bodies 13 press-fitted into the respective hub flange bodies 12, and a cylindrical hub for fixedly connecting the pair of bowl bodies 13 to each other. Torso 14
And

A gear 15 having a one-way clutch mechanism is mounted so as to cover a part of one of the pair of hub flanges 12 (the right side hub flange in the drawing). I have. Therefore, the one hub collar body 12
Is supplied with a driving force via a chain (not shown) and the gear 15.

On the other hand, a male screw is formed in a part of the other hub flange body 12 (the left hub flange body in the drawing), and a band brake drum (not shown) is attached. Therefore, a braking force is applied to the hub flange 12 via the drum of the band brake.

[0006] The hub body 10 is connected to a rim (not shown) constituting a wheel through a plurality of spokes 11 passed through spoke holes 12c provided in the hub flange body 12. A tire (not shown) is fitted into the rim. On the other hand, the hub axle 4 is attached to a rear fork (not shown) constituting a part of the body of the bicycle by using a tightening nut 16.

In such a wheel used for a vehicle such as a bicycle, the spokes 11 stretched between the hub 2 and the rim support the entire weight of the bicycle and the rider and transmit the driving force and the braking force. Will do. That is,
A large tension acts on the spoke 11.

[0008]

However, such a conventional hub 2 has the following problems. In the conventional hub 2, the spoke hole 12c is formed in the hub shaft 4
In a direction substantially the same as the axial direction.
On the other hand, spokes 11 are arranged in a plane substantially perpendicular to hub axis 4. Therefore, as shown in an enlarged manner in FIG. 17, the vicinity of the locking flange 11a of the spoke 11 is bent at substantially a right angle to form a hook portion 11b, and the hook portion 11b is hooked on the spoke hole 12c. Was.

However, when tension acts on the spokes 11, stress concentration causes stress on the inside of the bent portion 11 having a small radius of curvature.
Excessive tensile stress acts on c. Moreover, spoke 1
In order to withstand the strong tension (described above) acting on 1 and to reduce the weight of the wheel, a thin and hard steel wire is used as the material of the spokes 11. Therefore, the inside 11c of the bent portion having a large processing amount was significantly embrittled by work hardening.

[0010] For this reason, an accident has occurred in which the spoke 11 is broken near the inside 11c of the bent portion due to an impact load or a repeated load. Such a breakage accident is more likely to occur in the rear wheels where the weight distribution is high and not only the braking force but also the driving force acts.

In order to avoid such a situation, the spokes may be made thicker. However, since a large number of spokes are used (approximately 80 front and rear wheels in the case of a large wheel diameter), the number of spokes per spoke is large. Even if the weight increase is slight, the weight increase of the whole wheel is large. Increasing the weight of the wheels is not preferable because it causes not only an increase in the weight of the bicycle itself but also a decrease in acceleration performance and braking performance.

On the other hand, if only the spokes 11 used for the rear wheels are made thicker, the increase in wheel weight can be limited to only the rear wheels. However, in this case, the rim and the spoke 1
If the female screw (nipple, not shown) for fixing 1 is to be shared by the front and rear wheels, the diameter of the male thread portion (not shown) is shared by the front and rear wheel spokes having different thicknesses. There must be. This increases the spoke manufacturing cost. Further, by using a stepped spoke having a narrow central portion and a thick end, it is possible to suppress an increase in wheel weight to some extent, but the manufacturing cost of the spoke also increases. As mentioned above,
Since a large number of spokes are used to form one wheel, the cost of the entire wheel increases significantly even if the cost per spoke is small.

The present invention has been made to solve the above-mentioned conventional problems, and to provide a wheel hub for reducing breakage of wheel spokes while suppressing an increase in wheel weight and an increase in manufacturing cost of the wheel. Aim.

[0014]

Means for Solving the Problems, Functions and Effects of the Invention
The wheel hub according to claim 1, wherein the rotating body is configured to be rotatable around a wheel axis, the rotating body having a plurality of spoke engaging portions formed on a substantially circumference centered on the wheel axis. In the wheel hub provided with the above, a spoke engaging portion provided on the rotating body is configured to penetrate in a direction substantially orthogonal to an axis parallel to the wheel axis.

Therefore, by appropriately setting the direction of penetration of the spoke engaging portion, the angle between the direction of penetration and the direction of tension of the wheel spokes can be made obtuse. Further, when the spoke tension direction is outward from the tangent line of the substantially circumferential portion where the spoke engaging portion is formed, it is assumed that the penetration direction of the spoke engaging portion is set to a direction substantially orthogonal to the wheel axis. Also, the angle between the penetrating direction and the spoke tension direction is an obtuse angle.

Therefore, the bending angle of the hooked portion of the spoke can be made a considerably large obtuse angle.
As a result, the degree of stress concentration and the degree of work hardening at the bent portion of the spoke can be reduced. For this reason, breakage accidents can be reduced without using linear thick spokes or stepped spokes. That is, it is possible to reduce breakage of the wheel spokes while suppressing an increase in wheel weight and an increase in manufacturing cost of the wheel.

According to a second aspect of the present invention, there is provided a wheel hub, wherein a substantially cylindrical spoke support cylinder having a wheel shaft as a center axis is provided on a rotating body, a through hole is provided in the spoke support cylinder, and a part of the through hole is provided. Alternatively, the whole is used as a spoke engaging portion.

[0018] Therefore, the spoke can be easily penetrated in a direction substantially orthogonal to an axis parallel to the wheel axis by merely providing the spoke support cylinder on the rotating body and providing the through hole in the substantially cylindrical surface of the spoke support cylinder. A spoke engagement can be realized.

According to a third aspect of the present invention, there is provided a wheel hub, wherein a plurality of spoke engaging portions are alternately arranged on two adjacent circumferences of the spoke supporting tubular portion.

Therefore, when the spokes engaged with the plurality of spoke engaging portions are stretched so as to cross each other, interference between the spokes can be avoided.

According to a fourth aspect of the present invention, there is provided the wheel hub, wherein a plurality of through holes are provided so as to correspond to the plurality of spoke engaging portions on a one-to-one basis.

Accordingly, by engaging only one spoke in one through hole, each spoke can be held more reliably. For this reason, for example, when assembling wheels using an automatic assembling apparatus, automation becomes easier.

According to a fifth aspect of the present invention, in the wheel hub, the direction of penetration of the through hole is inclined with respect to the direction perpendicular to the wheel axis, toward the direction of extension of the wheel spokes engaged in the through hole. I do.

Accordingly, it is possible to further increase the bending angle of the hooked portion of the spoke. For this reason, the degree of stress concentration and the degree of work hardening of the spoke bending portion can be further reduced. Further, since the axis of the through hole does not intersect with the wheel shaft, it is easy to avoid interference with a hub body formed around the wheel shaft when the spoke is passed through the through hole. For this reason, the assembling work of the wheel is facilitated.

According to a sixth aspect of the present invention, in the wheel hub, two of the plurality of spoke engaging portions are arranged adjacent to each other on two adjacent circles, and different portions of one through hole are used. Are formed respectively.

Therefore, one through hole has a surplus size even through two spokes. For this reason, the spoke can be inclined in the through hole. As a result, it is possible to further increase the bending angle of the hook portion of the spoke. In addition, since the through hole is large, it is easy to pass the spoke. For this reason, the assembling work of the wheel is facilitated. Further, since the through holes are large and small in number, the processing of the through holes becomes easy.

According to a seventh aspect of the present invention, in the wheel hub, the through hole is a large-diameter portion formed continuously with the two spoke engaging portions disposed adjacent to each other, and the locking flange of the wheel spoke is inserted. A large diameter portion to be obtained.

Therefore, the hook hook portion of the spoke can be engaged with the engaging portion through the spoke engaging flange from the outside of the spoke supporting cylinder portion in the radial direction. For this reason, the assembling work of the wheel is facilitated.

[0029] In the wheel hub of the eighth aspect, the rotating body is a pair of bearings for rotatably supporting the rotating body with respect to the wheel shaft, and a predetermined distance in the axial direction of the wheel shaft. A pair of support portions provided apart from each other, wherein the spoke supporting cylinder portion is disposed axially inside the wheel shaft of the pair of support portions.

Therefore, even when a gear, a brake or the like is mounted on the pair of bearings on the outer side in the axial direction of the wheel shaft, the position where the spoke supporting cylinder is provided can be secured.

According to a ninth aspect of the present invention, there is provided a wheel hub, wherein the rotating body is a pair of bearings for rotatably supporting the rotating body with respect to the wheel shaft, and a predetermined distance in the axial direction of the wheel shaft. A pair of support portions provided apart from each other, and the spoke support cylinder portion is disposed axially outside the wheel shaft of the pair of support portions.

Accordingly, it is possible to arrange the pair of spoke supporting cylinders on the pair of bearings axially outside the wheel shaft. For this reason, it is possible to increase the interval between the left and right spokes on the rotating body. That is, the lateral rigidity of the wheel can be increased.

According to a tenth aspect of the present invention, in the wheel hub, the rotating body includes a flange formed continuously with the spoke supporting cylinder.

Therefore, since the flange portion functions as a reinforcing member, even if the thickness of the spoke supporting cylinder portion is reduced,
The spoke supporting cylinder does not significantly deform due to the spoke tension. For this reason, the weight can be further reduced while maintaining the strength of the wheel.

[0035]

FIG. 1 is a half sectional view showing the configuration of a bicycle hub 20 which is a wheel hub according to an embodiment of the present invention. The hub 20 is a hub (rear hub) used for rear wheels of the bicycle. The hub 20 includes a hub body 30 that is a rotating body rotatably supported on a hub shaft 22 that is a wheel shaft.

A male screw is formed on the outer periphery of the hub shaft 22, and a female screw is formed on each of the pair of ball pushing bodies 26 and 27 and the pair of lock nuts 24 and 25. The ball pusher 26 and the lock nut 24 are screwed into the hub axle 22 and tightened together at desired positions in the axial direction, so that the ball pusher 26 is fixed to the hub shaft 22 using the principle of the double nut. . Similarly, push body 2
By screwing the lock nut 7 and the lock nut 25 into the hub axle 22 and tightening them together at desired positions in the axial direction, the ball pushing body 27 is fixed to the hub axle 22 using the principle of the double nut.

The hub body 30 includes a pair of spoke supports 32 and 33 corresponding to the pair of hub flange bodies 12 shown in FIG.
A pair of bowls 34, 35 press-fitted inside the cylindrical portion 32e of the spoke support 32 (see FIG. 2A) and inside the cylindrical portion 33d of the spoke support 33 (see FIG. 2B).
(A pair of bearings) and the cylindrical portion 32 of the spoke support 32
c (see FIG. 2A) and a pair of spacers 31 and 37 respectively press-fitted inside the cylindrical portion 33c (see FIG. 2B) of the spoke support 33 and the pair of bowls 34 and 3
5, and a substantially cylindrical hub body 36 that is press-fitted into the spacers 31 and 37, respectively, and fixedly connects them to each other.

The hub body 30 is immovable in the axial direction with respect to the hub shaft 22 through a pair of ball pressing bodies 26 and 27 (described above) fixed to the hub shaft 22 and a plurality of steel balls 28. And it is supported rotatably around the axis.

Of the pair of spoke supports 32, 33,
A gear 3 having a one-way clutch mechanism so as to cover a part of one of the spoke supports 33 (the right side in the drawing).
8 are attached. Therefore, a driving force is applied to the one spoke support 33 via the chain (not shown) and the gear 38. The gear 38 having the one-way clutch mechanism as described above is used for the hub body 3.
The hub integrated into the unit 0 is called a unit hub.

A male screw is formed on the cylindrical portion 32e (see FIG. 2A) of the other (left side in the drawing) spoke support 32, and a band brake drum (not shown) is attached. Therefore, a braking force is applied to the spoke support 32 via the drum of the band brake.

The hub body 30 is provided with spoke supports 32, 33.
Is connected to a rim 46 (see FIG. 3) constituting a wheel through a plurality of spokes 44 (see FIG. 3) passed through through holes 32f and 33f provided in the vehicle. A tire (not shown) is fitted into the rim 46. On the other hand, the hub axle 22 is attached to a rear fork (not shown) which forms a part of the body of the bicycle by using a tightening nut 39.

FIGS. 2A and 2B show enlarged views of the spoke supports 32 and 33. FIG. As shown in FIG. 2A, the spoke support 32 is formed in a substantially stepped cylindrical shape. That is, the flange portion 32a, the cylindrical portion 32b, the cylindrical portion 32c, and the cylindrical portion 32e are formed in this order. Cylindrical part 32b
Corresponds to the spoke support cylinder.

The cylindrical portion 32b is provided with a plurality of through holes 32f penetrating in the thickness direction of the cylindrical portion 32b. Each through hole 32f is a long hole having a longitudinal direction oblique to the circumferential direction of the cylindrical portion 32b. That is, each through hole 3
Reference numeral 2f is an elongated hole formed by connecting two spoke engaging portions 32g and 32h arranged adjacent to two adjacent circumferences 40 and 42 set on the cylindrical portion 32b. In other words, two spoke engagement portions 32g,
32h are formed using different portions of one through hole 32f.

As shown in FIG. 2B, the spoke support 33 is also formed in a substantially stepped cylindrical shape. That is, the flange 33a, the cylindrical portion 33b, the cylindrical portion 33c, the cylindrical portion 33d, and the cylindrical portion 33e are formed in this order. The cylindrical portion 33b corresponds to the spoke supporting cylindrical portion. The cylindrical portion 33b is provided with a plurality of through holes 33f similar to the through holes 32f provided in the spoke support 32.

FIG. 3 shows one spoke support (for example, the spoke support 32), a plurality of spokes 44 (spokes for wheels), and a case where a bicycle wheel is assembled using the hub 20 shown in FIG. 5 is a drawing schematically showing a relationship between rims 46. FIG. 4 is a view for explaining a state of the spokes 44 in this case, and is indicated by an arrow IV in FIG. 2A.
FIG. FIG. 5 is a drawing schematically showing a cross section VV of FIG.

As shown in FIG. 5, the through hole 32f is an elongated hole formed by connecting the two spoke engaging portions 32g and 32h (described above), so that one through hole 32f is formed.
Is large enough to pass through two spokes 44 in the longitudinal direction. Therefore, the spoke 44 can be inclined in the through hole 32f. That is, to the extent that the locking flanges 44a of the two spokes do not interfere with each other.
The bending angle of the hook 44b of the spoke 44 can be increased. Therefore, the bent portion 44 of the spoke 44
The degree of stress concentration and the degree of work hardening of 3c can be reduced.

Further, since the through hole 32f is large, it is easy to pass through the spoke 44. For this reason, the assembling work of the wheel is facilitated. Furthermore, since the through holes 32f are large and the number is small, the processing of the through holes 32f becomes easy.

The axial direction (through direction) 64 of the through hole 32f is the same as the direction 21 orthogonal to the hub shaft 22.

FIG. 6 is a half sectional view showing the structure of a bicycle hub 50 which is a wheel hub according to another embodiment of the present invention. This hub 50 is also a rear hub for a bicycle, and has substantially the same configuration as the hub 20 shown in FIG. The structure of the spoke supports 52, 53 forming the hub 50 is substantially the same as the structure of the spoke supports 32, 33 forming the hub 20. However, the spoke support 5
The shapes of the through holes 52f, 53f in 2, 53 are different from the shapes of the through holes 32f, 33f in the spoke supports 32, 33.

FIG. 7 is a view for explaining a state in which the spokes 44 are passed through the through holes 52f provided in the spoke support 52 constituting the hub 50. As shown in FIG. 7, the two spoke engaging portions 52g and 52h are similar to the above-described through hole 32f in that they are formed using different portions of one through hole 52f. In the middle of the engaging portions 52g and 52h, a large-diameter portion 52i formed continuously with them is provided.
Different from the through hole 32f.

The large diameter portion 52i is configured so that the locking flange 44a of the spoke 44 can be inserted. Therefore, the cylindrical portion 52b which is the spoke supporting tube portion (see FIG. 6)
Through the locking flange 44a of the spoke 44 from the outside in the radial direction to the hook portion 44b of the spoke 44
(See FIG. 5) can be engaged with the engaging portions 52g and 52h. For this reason, there is no need to pass the spokes 44 from the inside in the radial direction of the cylindrical portion 52b, and the assembling work of the wheels is facilitated.

FIG. 8 is a half sectional view showing the structure of a bicycle hub 60 which is a wheel hub according to still another embodiment of the present invention. This hub 60 is also a rear hub for a bicycle, and has substantially the same configuration as the hub 20 shown in FIG. Spoke supports 62, 6 constituting hub 60
The structure of 3 is a spoke support 32 constituting the hub 20,
The structure is almost the same as the structure of No. 33. However, the shape of the through holes 62f and 63f in the spoke supports 62 and 63 is the same as the shape of the through holes 32f in the spoke supports 32 and 33.
It differs from the shape of 33f.

That is, in the hub 60, a plurality of through holes 62f are provided in one-to-one correspondence with the plurality of spoke engaging portions.
Is provided. Therefore, by engaging only one spoke 44 into one through hole 62f, each spoke can be held more reliably. For this reason, for example, when assembling wheels using an automatic assembling apparatus, automation becomes easier.

In this embodiment, as shown in FIG. 9, the direction of the axis 64 of the through hole 62f (through direction).
With respect to the direction 21 orthogonal to the hub shaft 22
The spokes 44 engaged with 2f are inclined toward the tension direction 45.

Therefore, the bending angle of the hook 44b of the spoke 44 can be increased. For this reason, the degree of stress concentration and the degree of work hardening on the inside 44 c of the bent portion of the spoke 44 can be further reduced. Further, since the axis 64 of the through hole 62f does not intersect with the hub shaft 22, when the spoke 44 is passed through the through hole 62f,
Interference with the hub body 36 and the like formed around the hub shaft 22 can be easily avoided. For this reason, the assembling work of the wheel is facilitated.

Note that, as shown in FIG.
The direction of the axis 64 (through direction) may be the same as the direction 21 orthogonal to the hub shaft 22. In this case, the through hole 62f may be a long hole having a longitudinal component in the circumferential direction of the cylindrical portion 62b.

In this manner, similarly to the case shown in FIG. 9, the bending angle of the hook 44b of the spoke 44 can be increased, and the spoke 44 can be inserted into the through hole 62f.
When passing through, it is easy to avoid interference with the hub body 36 and the like formed around the hub shaft 22. Further, the processing of the through-hole 62f is easier than in the case of FIG.

FIG. 11 is a half sectional view showing the structure of a bicycle hub 70 as a wheel hub according to still another embodiment of the present invention. The hub 70 is also a rear hub for a bicycle, and is a type of unit hub. The left half of the drawing has the same configuration as the hub 20 shown in FIG. However, the right half in the drawing has a different configuration from the hub 20 shown in FIG.

Referring to FIG. 11, the structure of the right half of the hub 70 will be described with reference to the drawing. At one end of the core 74,
One end of the spoke support 73 is press-fitted into the outer diameter portion, and one end of the hub body 36 is press-fitted into the inner diameter portion. A bowl 75 is screwed into the outer diameter portion of the other end of the core 74. Cone body 7
By screwing the lock nut 7 and the lock nut 25 into the hub axle 22 and tightening them together at desired positions in the axial direction, the ball pressing body 77 is fixed to the hub axle 22 using the principle of the double nut.

The hub 30 is provided with spoke supports 32, 7
3, a bowl 34, 75, a spacer 31, a core 74, and a hub body 36 are provided. The hub body 30 is immovable in the axial direction with respect to the hub axle 22 through a pair of ball pushing bodies 26 and 77 (described above) fixed to the hub axle 22 and a plurality of steel balls 28. It is rotatably supported around.

A gear 78 having a one-way clutch mechanism is mounted so as to cover a part of the core 74 and a part of the bowl 75. Therefore, a driving force is applied to the spoke support 73 via the chain (not shown) and the gear 78.

A plurality of through holes 32f provided in the cylindrical portion 32b of the spoke support 32, and the spoke support 7
The shape of the plurality of through holes 73f provided in the third cylindrical portion 73b is the same as the shape of the through hole 32f and the through hole 33f in FIG.

In each of the above embodiments, the unit hub is described as an example of the rear hub of the bicycle. However, the present invention is not limited to the unit hub. For example,
The present invention can also be applied to a rear hub of a type configured to mount a separately manufactured freewheel later.

The present invention is also applicable to a hub (front hub) used for a front wheel of a bicycle. FIG. 12A is a half sectional view showing the configuration of a bicycle hub 80 which is a wheel hub according to still another embodiment of the present invention. The hub 80 is a front hub for a bicycle.
The hub 80 includes a hub body 90 that is a rotating body rotatably supported on a hub shaft 82 that is a wheel shaft.

A male screw is formed on the outer periphery of the hub shaft 82, and a female screw is formed on each of the pair of ball pushing bodies 86 and the pair of lock nuts 84. The pair of ball pushing bodies 86 and the pair of lock nuts 84 are connected to the hub shaft 8.
2 and tightened to each other at a desired position in the axial direction, thereby using the principle of a double nut to fix the pair of ball pushing bodies 86 to the hub shaft 82.

The hub body 90 includes a pair of spoke supports 92.
And a pair of bowls 94 as a pair of bearings respectively press-fitted inside the cylindrical portion 92c of each spoke support 92,
A substantially cylindrical hub body 96 is press-fitted into the pair of bowls 94 and fixedly connects them to each other.

The hub body 90 is immovable in the axial direction with respect to the hub shaft 82 via a pair of ball pushing bodies 86 fixed to the hub shaft 82 (described above) and a plurality of steel balls 88. ,
It is supported rotatably about an axis.

The hub body 90 is connected to a rim (not shown) constituting a wheel via a plurality of spokes (not shown) passed through through holes 92f provided in the spoke support 92. A tire (not shown) is fitted into the rim.
On the other hand, the hub axle 82 is attached to a front fork (not shown) constituting a part of the body of the bicycle by using a tightening nut 99.

Each of the pair of spoke supports 92 is formed in a substantially stepped cylindrical shape that opens inward in the axial direction of the hub shaft 82. That is, the flange portion 92a, the cylindrical portion 92b, and the cylindrical portion 92c are formed in this order. Cylindrical part 92b
Corresponds to the spoke support cylinder.

Each cylindrical portion 92 of the pair of spoke supports 92
b, through holes 32f provided in the respective cylindrical portions 32b, 33b of the spoke supports 32, 33 shown in FIG.
A through hole 92f similar to 33f is provided. That is, each through hole 92f is a long hole having a longitudinal direction oblique to the circumferential direction of the cylindrical portion 92b.

In each of the embodiments described above, the embodiment shown in FIG. 1 will be described as an example. A cylindrical portion 32b provided with a through hole 32f and a cylindrical portion 33b provided with a through hole 33f
Are disposed axially inside the hub axle 22 with respect to the arm body 34 and the arm body 35, respectively.

Therefore, the arm 34 and the arm 35
Brake (not shown) axially outward of hub shaft 22
Even when the gear 38 is mounted, it is possible to secure the position where the cylindrical portion having the through hole, which is the spoke supporting cylindrical portion, is provided.

FIG. 12B is a half sectional view showing the structure of a bicycle hub 100 which is a wheel hub according to still another embodiment of the present invention. The hub 100 is a front hub for a bicycle. The hub 100 has substantially the same configuration as the hub 80 described above. However, unlike the hub 80, the pair of spoke supports 102 are both formed in a substantially stepped cylindrical shape that opens outward in the axial direction of the hub shaft 82. That is, the flange portion 102a, the cylindrical portion 102b, and the cylindrical portion 102c
Are formed in this order. The cylindrical portion 102b
Corresponds to the spoke support cylinder.

Each cylindrical portion 1 of the pair of spoke supports 102
02b includes a pair of spoke supports 92 shown in FIG. 12A.
A through-hole 102f similar to the through-hole 92f provided in each of the cylindrical portions 92b is provided.

In this embodiment, the through hole 102f
The pair of cylindrical portions 102b provided with are arranged outside the pair of arms 94 in the axial direction of the hub shaft 82, respectively. Therefore, the distance between the left and right spokes on the hub body 108 can be increased. That is, the lateral rigidity of the wheel can be increased.

FIG. 13A is a half sectional view showing the structure of a bicycle hub 110 which is a wheel hub according to still another embodiment of the present invention. The hub 110 is a front hub for a bicycle. The hub 110 has substantially the same configuration as the above-described hub 80 (see FIG. 12A). However, hub 8
Unlike 0, the diameter of both ends of the hub body 116 is larger than the diameter of the central part. By press-fitting both ends of the hub body 116 between the inside of the cylindrical portion 112c of the spoke support 112 and the outer diameter of the bowl 94, a pair of spoke supports 112, a pair of bowls 94, and a hub are provided. Torso 116
Are fixedly connected to each other.

Each of the pair of spoke supports 112 is formed in a substantially stepped cylindrical shape that opens inward in the axial direction of the hub shaft 82. That is, the flange portion 112a, the cylindrical portion 112b,
The cylindrical portion 112c is formed in this order. The cylindrical portion 112b corresponds to the spoke supporting cylinder.

Each cylindrical portion 1 of the pair of spoke supports 112
12b includes a pair of spoke supports 92 shown in FIG. 12A.
A through hole 112f similar to the through hole 92f provided in each of the cylindrical portions 92b is provided.

FIG. 13B is a half sectional view showing the structure of a bicycle hub 120 which is a wheel hub according to still another embodiment of the present invention. The hub 120 is a front hub for a bicycle. The hub 120 is the hub 110 described above.
The configuration is almost the same as that of FIG. 13A. However, in this embodiment, the spoke support 122 is not shown in FIG.
The spoke support 112 and the bowl 94 shown in FIG. 3A are formed continuously. That is, the spoke support 122 is formed by continuously and integrally forming the spoke support cylinder and the support.

The spoke support 122 includes a flange 122a,
A cylindrical portion 122b and a bowl portion 122c formed so as to be folded inside the cylindrical portion 122b are formed in this order. The cylindrical portion 122b corresponds to a spoke supporting cylindrical portion.

The diameter of both ends of the hub body 126 is larger than the diameter of the central part. By press-fitting both ends of the hub body 126 between the inside of the cylindrical portion 122b of the spoke support 122 and the outer diameter of the bowl 122c, the pair of spoke supports 122 and the hub body 126 Fixedly connected to

Each cylindrical portion 1 of the pair of spoke supports 122
22b includes a pair of spoke supports 11 shown in FIG. 13A.
2 through holes 11 provided in each cylindrical portion 112b.
A through hole 122f similar to 2f is provided.

FIGS. 14A to 15B show bicycle hubs 130 (see FIG. 14A), 140 (see FIG. 14B) and 150 (see FIG. 15A) which are wheel hubs according to still another embodiment of the present invention. ), 160 (see FIG. 15B). Hubs 130, 14
Reference numerals 0, 150, and 160 denote the above-described hubs 80 (see FIG. 12A), 100 (see FIG. 12B), and 110 (see FIG.
3A) and 120 (see FIG. 13B), and the reference numerals are omitted.

However, the hubs 130, 140, 150, 1
The through-holes 1 provided respectively in the 60 spoke supports
32f, 142f, 152f, and 162f are hubs 80,
The through holes 92f, 102f, 112f, 122f respectively provided in the spoke supports 100, 110, 120
And different. Through holes 132f, 142f, 152f, 16
Like the through holes 62f provided in the spoke supports 62 and 63 of the hub 60 (see FIG. 8), 2f is formed in a one-to-one correspondence with a plurality of spoke engaging portions.

These through holes 132f, 142f, 15
2f and 162f, as in the case of the through hole 62f, incline the direction of the axis of the through hole (through direction) toward the direction in which the spoke engaged with the through hole extends in the direction orthogonal to the hub axis. (See FIG. 9) or the same direction as the direction orthogonal to the hub axis. When the direction of the axis of the through-hole is the same as the direction orthogonal to the hub shaft, the through-hole should be a long hole having a longitudinal component in the circumferential direction of the cylindrical portion as shown in FIG. good.

In each of the above embodiments, the embodiment shown in FIG. 1 will be described as an example. As shown in FIG. 5, the penetration direction 64 of the spoke engaging portion 32h provided on the hub body 30 is used.
In a direction substantially perpendicular to an axis parallel to the hub shaft 22 (FIG. 5).
In the example, the direction 2 substantially orthogonal to the hub shaft 22 itself
1).

Therefore, by appropriately setting the penetration direction 64, the angle between the penetration direction 64 and the extending direction 45 of the spoke 44 can be made obtuse. In addition, the tension direction 45 of the spoke 44 is determined by the spoke engaging portion 32.
In the case where the circles h are formed outwardly from the tangent 41 of the circumferences 40 and 42, as shown in FIG.
Is set in a direction substantially orthogonal to the hub shaft 22 itself, the angle between the penetration direction 64 and the tensioning direction 45 of the spoke 44 is an obtuse angle.

Therefore, if the spoke engaging portion 32h
However, even if the through-hole (not shown) has a diameter slightly larger than the outer diameter of the hook 44b of the spoke 44, the bending angle of the hook 44b of the spoke 44 can be made obtuse. Become. As a result, the degree of stress concentration and the degree of work hardening on the inside 44c of the spoke bending portion can be reduced. For this reason, breakage accidents can be reduced without using linear thick spokes or stepped spokes. That is, the spoke breakage accident can be reduced while suppressing an increase in the wheel weight and an increase in the manufacturing cost of the wheel.

Further, in each of the above-described embodiments, FIG.
When the embodiment shown in FIG. 1 is described as an example, a cylindrical portion 32b having the hub shaft 22 as a central axis is provided on the spoke support 32, and the cylindrical portion 32b is provided with a through hole 32f. , Spoke engagement part 32
h. Therefore, by forming a through hole 32f in the cylindrical portion 32b by press working or the like, a spoke engaging portion 32h penetrating in a direction substantially orthogonal to an axis parallel to the hub shaft 22 can be easily realized.

Further, in each of the above-described embodiments, FIG.
When the embodiment shown in FIG. 2 is described as an example, as shown in FIG. 2A, a plurality of spoke engaging portions 32g, 32h,.
They are alternately arranged on two adjacent circumferences 40 and 42 of the cylindrical portion 32b.

Therefore, the plurality of spoke engaging portions 32
If the spokes 44 engaged in g, 32h,... are stretched to cross each other (see FIG. 4), interference between the spokes 44 can be avoided.

Further, in each of the above-described embodiments, FIG.
2A, the spoke support 32 of the hub 30 includes a flange 32a formed continuously with the cylindrical portion 32b.

Therefore, since the flange 32a functions as a reinforcing member, the cylindrical portion 32b is not significantly deformed by the tension of the spokes 44 even if the thickness of the cylindrical portion 32b is reduced. For this reason, the weight can be further reduced while maintaining the strength of the wheel.

In each of the above embodiments, the rotating body is provided with the flange formed continuously with the spoke supporting cylinder. However, the rotating body is formed continuously with the spoke supporting cylinder. It is also possible to configure so as not to include the provided flange portion.

Further, in each of the above embodiments, the plurality of spoke engaging portions are arranged alternately on two adjacent circumferences of the spoke supporting cylinder portion, but the present invention is not limited to this. Not something. For example, when the spokes for wheels are stretched so as not to intersect (so-called radial assembly), a plurality of spoke engaging portions may be arranged in a line on one circumference of the spoke support cylinder. it can.

In each of the above-described embodiments, a substantially cylindrical spoke supporting cylinder having a wheel shaft as a center axis is provided on the rotating body, a through hole is provided in the spoke supporting cylinder, and the spoke supporting cylinder is provided with a through hole. Although a part or the whole is used as a spoke engaging portion, the present invention is not limited to this. In short, a spoke engaging portion having a structure penetrating in a direction substantially orthogonal to an axis parallel to the wheel axis may be provided in any part of the rotating body.

In each of the above embodiments, the case where the present invention is applied to a bicycle hub has been described as an example.
The present invention can be applied to motorcycle hubs, automobile hubs, and other wheel hubs in general.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a configuration of a bicycle hub 20 which is a wheel hub according to an embodiment of the present invention.

FIG. 2A is an enlarged view of a spoke support 32 shown in FIG. 1; FIG. 2B is an enlarged view of the spoke support 33 shown in FIG.

FIG. 3 is a drawing schematically showing a relationship between one spoke support 32, a plurality of spokes 44, and a rim 46 when a bicycle wheel is assembled using the hub 20 shown in FIG.

FIG. 4 is a view for explaining a state of a spoke 44 in FIG. 3, and corresponds to an arrow IV in FIG. 2A.

FIG. 5 is a drawing schematically showing a cross section VV of FIG. 4;

FIG. 6 is a half sectional view showing a configuration of a bicycle hub 50 which is a wheel hub according to another embodiment of the present invention.

FIG. 7 is a view for explaining a state in which the spokes 44 are passed through through holes 52f provided in the spoke support members 52 constituting the hub 50.

FIG. 8 is a half sectional view showing a configuration of a bicycle hub 60 which is a wheel hub according to still another embodiment of the present invention.

FIG. 9 is a drawing schematically showing an example of a longitudinal sectional shape of a through hole 62f in the hub 60.

FIG. 10 is a drawing schematically showing another example of the longitudinal sectional shape of the through hole 62f in the hub 60.

FIG. 11 is a half sectional view showing a configuration of a bicycle hub 70 which is a wheel hub according to still another embodiment of the present invention.

FIGS. 12A and 12B are half sectional views showing the structures of bicycle hubs 80 and 100, respectively, which are wheel hubs according to still another embodiment of the present invention.

FIGS. 13A and 13B are half sectional views showing the configuration of bicycle hubs 110 and 120, respectively, which are wheel hubs according to still another embodiment of the present invention.

FIGS. 14A and 14B are half sectional views showing the configuration of bicycle hubs 130 and 140, respectively, which are wheel hubs according to still another embodiment of the present invention.

FIGS. 15A and 15B are half sectional views showing the structures of bicycle hubs 150 and 160, respectively, which are wheel hubs according to still another embodiment of the present invention.

FIG. 16 is a drawing showing an example of the configuration of a conventional hub 2.

FIG. 17 is an enlarged view of the vicinity of a spoke hole 12c in the hub 2.

[Explanation of symbols]

21: a direction substantially orthogonal to the hub shaft 22 22: a hub shaft 32b: a cylindrical portion 32f: a through hole 32h: a spoke engaging portion 40, 42... Circumference formed with spoke engaging portion 32h 41... Tangent to circumferences 40, 42 44... Spoke 44c... Bent portion 45 of spoke 44 ···································· Pulling direction of spoke engaging portion 32h.

Claims (10)

[Claims] 1. A wheel comprising: a rotating body rotatable around a wheel axis, the rotating body having a plurality of spoke engaging portions formed on a substantially circumference around the wheel axis. A hub for a wheel, wherein a spoke engaging portion provided on the rotating body has a structure penetrating in a direction substantially orthogonal to an axis parallel to the wheel axis. 2. The wheel hub according to claim 1, wherein a substantially cylindrical spoke supporting cylinder having the wheel shaft as a center axis is provided on the rotating body, and the spoke supporting cylinder has a through hole. A part or the whole of the through hole is used as the spoke engaging portion. 3. The wheel hub according to claim 2, wherein the plurality of spoke engaging portions are alternately arranged on two adjacent circumferences of the spoke supporting tubular portion. 4. The wheel hub according to claim 3, wherein a plurality of said through holes are provided in one-to-one correspondence with a plurality of said spoke engaging portions. 5. The wheel hub according to claim 4, wherein a through direction of the through hole is inclined toward a direction in which a wheel spoke engaged with the through hole extends in a direction perpendicular to the wheel axis. That is characterized by 6. The wheel hub according to claim 3, wherein, of the plurality of spoke engaging portions, two spoke engaging portions arranged adjacent to each other on the adjacent two circumferences are provided.
Characterized by being formed using different portions of one through hole. 7. The wheel hub according to claim 6, wherein the through hole is a large-diameter portion formed continuously with the two spoke engaging portions arranged adjacent to each other, and is engaged with the wheel spoke. A large-diameter portion through which a flange can be inserted. 8. The wheel hub according to claim 2, wherein the rotating body is a pair of bearings for rotatably supporting the rotating body with respect to the wheel shaft. A pair of bearings provided at a predetermined distance apart in the axial direction of the wheel axle, the spoke support cylinder is disposed axially inside the wheel axle of the pair of bearings, What is characterized by. 9. The wheel hub according to claim 2, wherein the rotating body is a pair of bearings for supporting the rotating body rotatably with respect to the wheel shaft. A pair of bearings provided at a predetermined distance in the axial direction of the wheel axle, and the spoke support cylinder is disposed axially outside the wheel axle of the pair of bearings, What is characterized by. 10. The wheel hub according to claim 2, wherein the rotating body includes a flange formed continuously with the spoke supporting cylinder. thing.