JPH08108701A - Joint structure of hub and spoke for bicycle - Google Patents

Abstract

PURPOSE: To maintain the degree of freedom for a spoke extension mode, regarding the structure where an expanded head formed at one end of a straight spoke is jointed to a hub body. CONSTITUTION: Each one set of two flanges 23 and 23 faced to each other via a small gap is arranged on the external surface of both ends of a hub body 32, and bearing holes 230 and 230 are drilled through the sets of the flanges 23 and 23 in such state as opposed to each other. In addition, spoke support shafts 25 are inserted in the holes 230 and 230, so as to be capable of free rotation, and straight spokes 1 are provided through spoke insertion holes formed at the center of the shafts 25 in a radial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle hub-spoke connection structure, and more particularly to a so-called straight spoke-hub connection structure in which hub-side end portions are formed in a straight line shape. The present invention relates to a connection structure of straight spokes and a hub that can be applied even when stretched in the form of.

[0002]

2. Description of the Related Art As a connecting structure for a bicycle hub and spokes, for example, a structure as shown in FIG. 5 is known. This is a so-called straight spoke with a straight tip.
(1) is connected to the hub body (32), and the hub body is attached to the plates (20) and (20) that project radially from the outer periphery of the end of the hub body (32).
Spoke holes (21) (2) drilled in the substantially circumferential direction of (32)
1) is formed, and straight spokes (1) are inserted into the spoke holes (21) (21) and their enlarged heads are formed.
(11) is engaged in the retaining state.

In this structure, since the hub-side ends of the straight spokes (1) are straight, an L-shaped engaging portion obtained by bending the spoke ends is engaged with the spoke holes of the hub collar. There is an advantage that the durability is improved as compared with the above. That is, in the latter spoke, since the bending stress changes repeatedly on the bending base end of the L-shaped engaging portion when the bicycle travels, the repeated stress causes the bending base end to be fatigued and damaged over time. Easier to do. On the other hand, since the hub-side ends of the straight spokes (1) are formed in a straight line, the bending stress does not act on the base ends of the expanded heads (11) and their durability is improved. It will improve.

However, since the spoke holes (21) and (21) are bored in the same direction as the traverse direction in the above-mentioned conventional one, the tension of the spokes is fixed to this traverse type, and this connection is made. There is a problem that the structure cannot be applied to other spoke tensioning modes. The present invention has been made in view of the above points, and is a "spoke connection structure in which an enlarged head (11) formed at one end of a straight spoke (1) is connected to a hub body (32)". At the spoke
It is an object of the present invention to provide a connecting structure that can be applied both when the (1) is radially stretched between the hub body (32) and the rim and when it is stretched in a twill shape.

[0005]

[Technical Means] A technical means of the present invention for solving the above-mentioned problem is to set "a pair of two pieces arranged one by one on the outer circumference of both ends of the hub body (32) and facing each other with a small space therebetween. Flange of
(23) (23), the bearing holes (230) (230) penetratingly provided in the pair of flanges (23) (23) so as to face each other, and the bearing holes (230) (230) facing each other. Spoke support shaft (2
5) and a spoke insertion hole (250) formed in the trunk of the spoke support shaft (25), and the spoke support shaft (25) is provided with a bearing hole (2
30) When it is inserted in (230), its spoke insertion hole (25
(0) is located between the flanges (23) and (23), and the straight spokes (1) are inserted into the spoke insertion holes (250) so that the enlarged head (11) does not come off. I was allowed to do it. "

[0006]

The above technical means operates as follows. The straight spokes (1) are swingable in the wheel circumferential direction by being supported by a spoke support shaft (25) which is rotatably inserted in a spoke receiver (2). That is, the bearing hole (230) formed in such a manner as to face the pair of flanges (23) (23).
A spoke support shaft (25) is rotatably inserted into the (230), and a spoke insertion hole (250) is formed in a body portion of the rotatable spoke support shaft (25). Straight spokes
The enlarged head (11) at the end of (1) is engaged in a retaining state. Therefore, the straight spokes (1) are
It becomes possible to rotate together with (25), which allows the straight spokes (1) to swing in the circumferential direction of the rim.

[0007]

[Effect] The present invention has the following unique effects. Hub body (32)
Since the straight spokes (1) that are connected to the can swing freely in the rim circumferential direction, the straight spokes (1) can be
It is possible to provide a connecting structure that can be applied both when radially extending between 2) and the rim and when extending in a twill shape.

[0008]

EXAMPLES Next, examples of the present invention described above will be explained.
As shown in FIG. 1, the hub (3) includes a hub shaft (30) and a hub body (32) rotatably fitted to the hub shaft (30) via steel balls (31) (31), Flange (23) and (23) facing each other with a distance slightly wider than the diameter of the shaft portion (10) of the straight spokes (1) are projected on both outer circumferences of the hub body (32), and the pair of flanges (23) (23) constitutes the spoke receiver (2).

Bearing holes (230) and (230) facing each other are formed in the flanges (23) and (23), and the bearing holes (230)
The spoke support shaft (25) having the structure shown in FIG.
Is rotatably inserted. Spindle for this spoke (25)
Is formed in a cylindrical shape as a whole, and a spoke insertion hole (250) is pierced through the body portion in the diameter direction, and the spoke support shaft (25) is attached to the flange (23) (23). Bearing hole (230)
These flanges (23) (23) when loaded in the (230) part
The spoke insertion holes (250) are located between the two. The spoke insertion hole (250) of the spoke support shaft (25) is formed to have a diameter slightly larger than the diameter of the shaft portion (10) of the straight spoke (1) and smaller than the enlarged head portion (11). As a result, the straight spokes (1) can be inserted into the spoke insertion holes (250) while being retained.

Next, the work of assembling the straight spokes (1) using the above parts will be described. First, the flange (2
3) The spoke support shafts (25) and (25) are individually inserted into the bearing holes (230) and (230) that are bored opposite to each other in (23). Next, straight spokes from between the adjacent specific spoke support shafts (25, 25).
(1) Insert (1), and insert the tip of the straight spoke (1) into the corresponding spoke insertion hole (25) of the spoke support shaft (25).
0). And the straight spokes (1)
The screw portion (12) at the tip of the rim is made to correspond to the nipple (41) provided in the spoke hole (40) of the rim (4), and the nipple (41) is screwed and tightened. Then, the enlarged heads (11) of the straight spokes (1) are replaced by the spoke insertion holes (2) of the spoke support shaft (25).
50), and the screw part (12) at the end of the straight spoke (1) is rimmed with the spoke hole (40).
Tightened and fixed to the (4) side, which completes the work of stretching the straight spokes (1) (1). And according to the above, each spoke support shaft (25) has a bearing hole of the flange (23).
Since it is rotatably inserted into (230) and (230), it is also possible to stretch straight spokes (1) and (1) radially as shown by the solid line in FIG. As shown in the drawing, it is possible to stretch in a twill shape.

In the embodiment shown in FIG. 4, the outer circumference of both ends of the spoke support shaft (25) is tapered toward the tip to form a tapered surface.
(252) (252), and the inner circumferences of the bearing holes (230) (230) in the flanges (23) (23) are also tapered similarly to the above. According to this embodiment, the spoke bearing (2
5) and the bearing holes (230) (230) are fitted on the tapered surface,
When tension is applied to the spokes (1), the spoke support shafts (25) move the flanges (23) (2
There is an advantage of centering in the gap center of 3). This avoids the inconvenience that the spoke support shaft (25) shifts in the axial direction from the proper position and the spoke (1) contacts the outer peripheral edge of the flange (23), which results in durability of the spoke (1). It is possible to prevent the inconvenience of being scratched, which causes deterioration of the sex.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

[Fig. 2] Illustration of the assembly work of straight spokes (1) (1)

FIG. 3 is a perspective view of the spoke support shaft (25).

FIG. 4 is an explanatory view of a second embodiment.

FIG. 5 is an explanatory view of a conventional example.

[Explanation of symbols]

 (1) ・ ・ ・ Straight spokes (11) ・ ・ ・ Enlarged head (23) ・ ・ ・ Flange (25) ・ ・ ・ Spoke support shaft (32) ・ ・ ・ Hub body (230) ・ ・ ・ Bearing hole (250) ・ ・ ・ Spoke insertion hole

Claims (2)

[Claims] 1. A spoke connecting structure in which an enlarged head portion (11) formed at one end of a straight spoke (1) is connected to a hub body (32). A pair of flanges (23) (23) arranged one by one and facing each other with a small space between each pair, and flanges (23) (23) of each pair.
Bearing holes (230) (230) penetrating in a manner to face each other
And a spoke support shaft (25) rotatably inserted into each of the facing bearing holes (230) (230), and a spoke insertion hole (250) formed in the body of the spoke support shaft (25). ) Is provided so that the spoke insertion hole (250) is located between the flanges (23) and (23) when the spoke support shaft (25) is inserted into the bearing holes (230) and (230). A bicycle hub-spoke connection structure in which straight spokes (1) are inserted so that the enlarged heads (11) are retained in the spoke insertion holes (250). 2. A spoke support shaft (25) is formed with a tapered outer periphery at both ends, and the inner peripheral surfaces of the bearing holes (230) (230) into which the spoke support shaft (25) is inserted match the tapered surface. The connecting structure for a bicycle hub and spoke according to claim 1, wherein the connecting surface is a tapered surface.