JPS6131841Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in the assembly of spoke wheels mainly used for bicycles and motorcycles.

The conventional example is explained in detail in Figs. 1 to 8. The spokes S are made by cutting a single straight steel wire to a certain length, and hetting and bending one end of the spoke S to form the head 2. and a neck portion 3 and a bent portion 4 bent at a certain angle with respect to the shaft portion 5 (hereinafter, the head portion 2, neck portion 3, and bent portion 4 are collectively referred to as the spoke head 1),
A male thread is carved at the other end to form a threaded portion 6, and one spoke S is completed. A large number of spoke holes 9 are drilled on the same circular pitch on the outer periphery of the flanges 8, 8 in the hub H1 (generally, 18 to 20 holes are drilled in one flange of the hub, so both spoke holes 9 are drilled at the same circular pitch). A total of 36 to 40 holes are drilled) and
The spokes S are inserted into each spoke mounting hole 9, and the nipples 7 are screwed and tightened from the rim R side, and the spokes S are inserted while observing the vertical and horizontal deflection in the rim R.
is tensioned by the nipple 7, and when a tire (tube not shown) T is attached, it becomes a usable wheel. A front view of this spoke S assembled is shown in Figure 3, but as shown in Figures 2 and 6, the spoke S is actually an outer spoke.
Sa, Sa... and inner spokes Sb, Sb... are alternately stretched against the rim R in the third dimension direction. This is to prevent the outer spokes Sa and inner spokes Sb from interfering with each other since the adjacent spokes S are stretched in different directions. Figures 7 and 8 show the state in which the spokes S are tensioned.
When tension F is applied to spoke head 1, its head 2
Point Q and point P of the neck portion 3 serve as fulcrum points, and while deforming the bent portion 4, the shaft portion 5 actually
contacts the outer peripheral edge of the flange 8 and is often interfered with by the shaft portion 5. As a result, the bent portion 4 is work-hardened.
A break may be induced on the line connecting points A and B, and in some cases, a break may occur at the neck C. In the case of inner spoke Sb in Fig. 8, breakage occurs in the same way as outer spoke Sa, but outer spoke Sa
(In the case of the inner spoke Sb, there is no contact with the outer peripheral edge of the flange 8, and the relationship between the hub H1 and the tension F in this conventional example is similar to that of the outer spoke Sa. (The explanation is omitted as it is the same as in the previous case).
As is clear from FIGS. 7 and 8, the outer spoke Sa is closer to the bent portion 4 than the inner spoke Sb.
must have a large bending angle, and furthermore, the outer spoke Sa must have a longer length than the inner spoke Sb. However, when the outer spoke Sa is made as described above, the work hardening of the bent portion 4 is significant, which not only causes the spoke S to become brittle, but also causes the bending angle to be an acute angle of 90 degrees or more, which also affects the thickness of the flange 8. However, since it is difficult to insert the spoke mounting hole 9, the diameter of the spoke mounting hole 9 has to be made larger, and the lever action using the Q and P points as fulcrums increases the stress, so it is difficult to bend the spoke mounting hole 9. Part 4 and neck C
This results in accelerated rupture. However, due to actual manufacturing and handling, especially in bicycle spokes, outer spokes Sa and inner spokes Sb are not manufactured separately, and when viewed from the inner spoke Sb, the bending angle of the bent portion 4 is large (approximately 90 degrees). The length of the neck portion 3 is long, and when used as a wheel, the spokes S may loosen early and become unusable unless tightened, which may even lead to unexpected accidents. Note that 10 in FIG. 4 is the shaft portion of the hub H1.

In order to eliminate the above-mentioned disadvantages of spokes, we improved the hub, making it possible to incorporate the entire spoke into the inner side, making the spoke head the same bending angle, the neck length the same, and the shaft length different. This is designed to maintain a balance between tension and stress on the spokes after assembly, and is intended to further improve the strength of the spoked wheel.

An embodiment of the present invention will be described with reference to FIGS. 9 to 11. First, the hub H has flanges 25, 25 following boss parts 22, 22 at both ends of the shaft part 21, and the center of the flanges 25, 25. It consists of holes 30, 30 into which the bearings are inserted, and a hole 31 that passes through the axle. Spoke attachment holes 26 and 27 are drilled and arranged in parallel at different concentric pitches and at equal intervals. Further, from the outside of the flanges 25, 25, deep seats 28 are formed by coining with a drill or press in the spoke mounting holes 27 on the inner peripheral edge 23, and similarly, in the spoke mounting holes on the outer peripheral edge 24, deep seats 28 are formed by coining with a drill or press. A shallow chamfered seat 29 is formed by coining with a drill or press. Furthermore, in the embodiment shown in FIGS. 9 and 10, the outer peripheral edge 24 on the inner surface of the flange 25 is stepped, which is thinner than the inner peripheral edge 23 by approximately the thickness of the spoke S. Although not shown, the outer circumferential edge 24 may be made thinner in a tapered manner from the outer circumferential portion of the spoke attachment hole 27 on the inner circumferential edge 23 to the outer circumferential edge 24, and the depth of the seat 28 may be It is made deeper by the difference in stepped thickness. On the other hand, the spoke mounting holes 26, 26... are the spoke mounting holes 27, 27...
spoke mounting holes 26 and 27 are drilled in parallel radially from the center of the flange 25 and the center of the hole 31 in a concentric circle pitch and at equal intervals. You may
Since the area of the outer peripheral edge 24 is large, the spoke mounting holes 2
Even if the number of spoke mounting holes 6 and spoke mounting holes 27 is increased, it can be used satisfactorily.

With the above hub configuration, a large number of spoke mounting holes can be provided on the outer periphery of the flange as in the conventional example, so the number of spokes can be increased, and the number of spoke mounting holes can be kept within the same number as in the conventional example. Even when drilling on the periphery/outer rim, the spoke mounting holes will be reduced at the outer rim, and the strength of the flange will not be compromised.Since the seats are deep from the outside of the spoke mounting holes on the inner rim, the spoke The bending angle of the head and neck length may be the same as the spoke head shape that is attached to the inner and outer edges.In addition, the spokes should be inserted toward the inner edge, and the slight pitch difference between the inner and outer edges of the spokes should be the same. The lengths of the shafts are different, but since the difference is in the linear shafts, the spokes can be simply compared side-by-side and classified when assembled, and during manufacturing, the difference in the bending angle of the spoke head and the length of the neck length can also be considered. It is easier to select than by comparison, the spokes can be assembled on the inner side, and the bending angle of the spoke head can be loosened, making it easier to insert the spoke into the spoke mounting hole, and improving the accuracy of the spoke mounting hole. Since the bending angle has become looser, the degree of work hardening is reduced, and the brittleness associated with work hardening is freed, and the position of the protruding spoke bending part is adjusted inside the spoke mounting holes at the outer and inner peripheral edges. Since they are different, there is no interference between the spokes at all, and since they are internally assembled, there is no interference between the flanges and spokes. Also, since it is an inner assembly, all spoke mounting holes can be seated from the outside, improving work efficiency. Furthermore, since outer spokes are not used as in the conventional example, the spacing between the flanges can be increased, and the tension angle at which the spokes are stretched can be increased, so that the load can be distributed. As a result, the necks of the spokes can be shortened and the bending angles can be made looser than the ideal, making it possible to obtain spokes that are as strong as, or even stronger than, conventional models, which also improves the overall strength of the hub. Since the strength of the wheel is improved, it has an excellent effect on safety.

[Brief explanation of drawings]

Figures 1 to 6 show conventional examples. Figure 1 is a side view of the spokes and nipples, Figure 2 is a sectional view of the hub, spokes (nipples omitted), rim, and tire assembled to form a spoked wheel. Figure 3 is a front view of Figure 2, Figure 4 is a front view of the hub, Figure 5 is a side view of Figure 4 as seen from the flange side, and Figure 6 shows how the hub is assembled with spokes around the flange. Fig. 7 is a partially enlarged view when the spokes are used as outer spokes; Fig. 8 is an enlarged view when the spokes are used as inner spokes, similar to Fig. 7; Figure 9 or 1
Figure 1 is a drawing of one embodiment of the present invention,
9 is an enlarged side view of the hub as viewed from the outer surface of the flange, FIG. 10 is an enlarged cross-sectional view taken along line X--X in FIG. 9, and FIG. 11 is a schematic perspective view showing the assembled state of the hub and spokes. S...Spoke, 1...Spoke head, 2...Head, 3...Neck, 4...Bending part, 5...Shaft part, 2
3... Inner side of the outer circumferential edge 24 (inner circumferential edge), 24... Outer circumferential edge, 25... Flange, 26, 27... Spoke mounting hole, 28, 29... Seat.

Claims (1)

[Scope of claims for utility model registration] (1) The outer periphery of the hub and the inside of the outer periphery of the hub,
In a wheel in which spoke mounting holes are equally divided at different concentric pitches, spokes are hooked into the spoke mounting holes, and the spokes are connected to a rim and stretched, the spokes are attached to the outside of the flange of the hub. A chamfered seat is formed in the spoke mounting hole on the periphery, and a deep seat is formed in the inner spoke mounting hole of the outer periphery on the outer surface of the flange. A spoked wheel characterized in that the wheel is constructed by assembling the spokes so that the bent portion and the shaft portion of the spokes are located on the inner surface of the flange. (2) Claim 1 of the utility model registration claim characterized in that spokes having different shaft lengths are assembled into the spoke mounting holes on the outer periphery of the flange and the spoke mounting holes on the inner side of the outer periphery, respectively. spoked wheels.