JPH0485101A - Spoke wheel structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of a wheel having spokes, which is often used particularly in motorcycles.

(Prior Art) The above-mentioned wheel usually has a hub rotatably supported by left and right bearings on the axle, and a rim connected to the hub by spokes.

The load of the vehicle body is supported on the road surface through the axle, hub, spokes, rim, and tires in this order. and,
In this case, the load on the hub and spokes tends to concentrate on the spoke connection portion of the hub to which the spokes are connected, and this spoke connection portion is a portion that is relatively easily damaged.

(Problems to be Solved by the Invention) By the way, if the spoke connection part is damaged, it is required to replace the entire hub with a new one in the conventional configuration, since the hub is an integral part. However, in addition to the above-mentioned spoke connection parts, the hub includes a bearing support part that is supported on the axle by a bearing, and a part that supports the power transmission member, so the spoke connection parts are damaged as described above. Just 1. It would be extremely unreasonable to replace all of these.

(Purpose of the Invention) This invention was made with attention to the above-mentioned circumstances, and it is necessary to replace the entire hub when one part of the hub is damaged, while the other part can be used as is. The purpose is to eliminate the conventional absurdity that it is not possible.

(Structure of the Invention) A feature of the present invention for achieving the above object is that the left and right bearing support portions in which the hub is supported on the axle by respective bearings, and the spoke connection portions in which the spokes are connected are separated from each other. It consists of three main parts, and these three parts are removably fixed to each other.

(for production) The effects of the above configuration are as follows.

The hub 17 is composed of three separate members: left and right bearing support parts 22.23 supported on the axle 9 by bearings 15.16, and a spoke connection part 24 that connects the spokes 20. The members are removably fixed to each other.

Therefore, if the spoke connection part 24 is damaged, only the spoke connection part 24 can be replaced with a new one, leaving the other left and right bearing support parts 22, 23.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In Figure 2, ■ is a motorcycle, and this motorcycle l
has a body frame la. This body frame
A front wheel 1c is supported at the front end of the vehicle a via a front fork 1b, and a rear wheel 1d is supported at the rear of the body frame la, and this rear wheel ld is driven by an engine le.

In addition, if is the front fuel tank, Ig is the rear fuel tank, and ih is the seat.

1 to 3, an arrow Fr in the figures indicates the front of the motorcycle l, and in the following description, left and right refers to the direction toward the front.

The vehicle body frame la has a pair of left and right gloss arm brackets 2.2 at the rear thereof, and a rear arm 4 is pivotably supported on a pivot shaft 3 installed on the rear arm brackets 2.2 so as to be vertically swingable.

Reference numeral 5 denotes a power transmission device driven by the engine le, and this power transmission device 5 is supported by the vehicle body frame la and also supported by the pivot shaft 3.

The rear arm 4 has a bifurcated rear portion and includes left and right arm portions 6.7. Each arm part 6.7
A notch 8 extending forward is formed at the rear end, and each end of an axle 9 is fitted into the left and right notches 8, 8 so as to be slidable forward and backward.

This axle 9 has a bolt shape, and its right end is a bolt head 10. The left end is the threaded part 11, and these bolt heads 10
and a threaded part 11 protrude from the outer surface of each arm part 6.7, and a nut 12 is screwed into the threaded part 11.

The axle 9 supports the rear wheel 1d. This rear wheel 1d has a left bearing 15 and a right bearing 16 on the axle 9.
The rim 19 has a hub 17 rotatably supported by the hub 17, and a rim 19 to which a tire 18 is attached is connected to the hub 17 by a large number of wire spokes 20.

The hub 17 is divided into three parts on the left and right, namely, a disk-shaped left bearing support part 22 supported on the axle 9 by a left bearing 15, and a disk-shaped left bearing support part 22 supported on the axle 9 by a right bearing 16. It is comprised of a right bearing support part 23 and a cylindrical spoke connection part 24 that connects the spokes 20. The left bearing support part 22 is removably screwed to the left end of the spoke connection part 24 by nine left ports 25 in the circumferential direction, and the right bearing support part 23 is screwed in the circumferential direction to the right end of the spoke connection part 24. It is removably screwed by nine right ports 26. In addition, the parts screwed together in this way are fitted with each other by doweling, thereby ensuring alignment.

A driven chain wheel 27 is removably collinear with the left port 25 at the left end of the left bearing support portion 22, and a transmission chain 28 is connected between the driven chain wheel 27 and the drive chain wheel 29 of the power transmission device 5. The power of the engine le is transmitted to the rear wheel 1d via the transmission chain 28 and the driven chain wheel 27.

Brake equipment for the rear wheel 1d above! f30 is provided. This brake equipment fi 30 has a brake disc 31, and this brake disc 31 is removably collinear with the right end of the right bearing support part 23 by six of the nine right ports 26.

Further, a bracket 32 is pivotally supported on the axle 9 between the right bearing support section 23 and the right arm section 7, and the rotating end of the bracket 32 is connected to a guide 33 that projects from the right arm section 7.
It is slidably fitted only in the front-to-back direction.

A caliper 34 is screwed to the bracket 32 with bolts 35, and the caliper 34 accompanies the back and forth movement of the rear wheel 1d together with the bracket 32. The caliper 34 is hydraulic, and the brake pedal (not shown) is operated by the rider.
By this operation, the brake disc 31 is clamped to brake the rear wheel 1d.

A collar 36 is fitted onto the axle 9, and the nut 12
If you screw it on, the collar 36 and the left and right arm parts 6.7
etc. are sandwiched, and the rear wheel 1d is fixed to the rear arm 4.

On the other hand, by loosening the nut 12 and removing it from the threaded portion 11, taking out the rear wheel 1d, and loosening the left port 25 and the right port 26, each component of the rear wheel 1d can be individually disassembled. . In particular, the hub 17 is
2. It can be disassembled into three parts, the right bearing support part 23 and the spoke connection part 24, so if any of these parts is damaged, only it can be replaced with a new one. I can do it.

Note that the above configuration may be applied to the front wheel of a motorcycle.

1 to 4, the transmission chain 28 is provided with a tension adjustment device.

That is, a left cam plate 38 is sandwiched between the left arm portion 6 and the nut 12, and a fitting hole 38a formed in the left cam plate 38 fits into the axle 9. In this case, axle 9
A part of the outer peripheral surface of the axle 9 is cut out to form a flat surface 39 extending to the left end of the axle 9. On the other hand, a locking portion 40 is formed in the fitting hole 38a and is removably fitted to the flat surface 39 from the axial direction of the axle 9.
is supposed to rotate together with the axle 9.

Further, a right cam plate 42 is sandwiched between the right arm portion 7 and the bolt head 10, and a fitting hole 42a formed in the right cam plate 42 fits into the axle 9. In this case, the part of the axle 9 that fits into the fitting hole 42a has a larger diameter than other general parts, and a part of the outer circumferential surface of the large diameter part 45 is cut out to form a flat surface 46. It is formed. The locking portion 4 is removably fitted into the flat surface 46 from the axial direction of the axle 9.
7 is formed in the fitting hole 42a, so that the right cam plate 42 rotates together with the axle 9.

Both cam plates 38 and 42 have fitting holes 38a and 42, respectively.
As described above, each of the fitting holes 38a, 42a is fitted into the axle 9 so that the respective outer circumferential portions have the same shape and size when viewed from the center of point a, and are in the same posture.

Engagement pins 49 are protruded from each arm portion 6.7 adjacent to the front of the left cam plate 38 and right cam plate 42, respectively. Parts of the outer circumferential surfaces of the left cam plate 38 and the right cam plate 42 can be engaged with the engagement pin 49.

When trying to adjust the tension of the transmission chain 28, first loosen the nut 12 and tighten the transmission chain 28.
・The axle 9 is moved backward until a predetermined tensile force is generated. Next, in this state, the operator pulls the left cam plate 38
Alternatively, the right cam plate 42 on the side that is easier to operate is rotated so that the front surface of its outer peripheral surface is engaged with the rear surface of the engagement pin 49.

In this case, the left cam plate 38 and the right cam plate 42 are designed to rotate together with the axle 9, so if one of them is rotated, the other will also rotate in the same way, and the outer peripheral surface of the left cam plate 38 and the right cam plate 42 will rotate together. The front surface is also automatically engaged with the rear surface of the engagement bin 49. In other words, the alignment of the axle 9 is ensured by rotating either the left cam plate 38 or the right cam plate 42. In this way, the axle 9 is prevented from moving forward from that position.

As a result, positioning of 9 is performed. Then, from this state, screw the nuts 12 to attach the axle 9 to each cam plate 38.
42 and collinear with the rear arm 4, the transmission chain 28 will maintain a predetermined tensile force.

By the way, conventionally, the left cam plate 38 and the right cam plate 42
The cam plates corresponding to the cam plates are independently rotatably supported on the axle 9, and therefore, the operation of rotating these cam plates to a predetermined posture must be performed for each cam plate individually. there were. However, in the above-mentioned embodiment, it is sufficient to perform the process on only one side, so there is an advantage that the operation becomes easy.

Referring to FIG. 5, the brake disc 31 will be explained in detail. This brake disc 31 has an outer circumferential portion 51 that is frictionally connected to the caliper 34.
Three spokes 52 are formed at equal intervals in the circumferential direction and are linearly bridged from one part of the first part to the other part, and these spokes have the same shape and size. Then, the intermediate portion of each spoke 52 is connected to the right bearing support portion 23 by the two right bolts 26, 26.
is screwed to.

The spoke 52 and the right bolt 2 screwed onto it
6.26 are provided almost symmetrically on the left and right with respect to an imaginary line 54 passing through the center of the axle 9 and the longitudinal center point 53 of the spoke 52. Furthermore, the intersection angle θ between the spokes 52 and the imaginary line 54 is approximately 90° on the Japanese side.

With the above configuration, when the outer circumferential portion 51 thermally expands due to frictional heat generated by the caliper 34, each spoke 52 is easily deformed by receiving bending stress. As a result, it extends uniformly in the radial direction while remaining flat, and its function when sandwiched between the calipers 34 is maintained well.

That is, the conventional spokes corresponding to the spokes 52 extend radially, and therefore, when the outer circumferential portion 5I thermally expands, the conventional spokes restrict the expansion by a tensile force, so that the outer circumferential portion 51 However, the problem was that the whole body was deformed into a saddle shape, impairing its function.
According to the embodiment described above, such inconveniences can be prevented from occurring.

FIG. 6 shows a modification of the brake disc 31.

According to this, six spokes 52 are provided at equal intervals in the circumferential direction, and each spoke 52 has an arc shape centered on the center of the axle 9. Further, the right bolt 26 is located at the center point 53 of the spoke 52.

Also in this example, when the outer circumferential portion 51 thermally expands, each spoke 52 receives bending stress and easily deforms, so that the outer circumferential portion 51 remains flat and has an even diameter as shown by the imaginary line in the figure. direction, and in this case also maintains its functionality well.

In order for the brake disc 31 to exhibit the above-described effects, it is preferable that the intersection angle θ is in the range of 45° to 135°, and the length of the spokes 52 is 0.0000000000000000000000000000000000000000000000000000
．． It is preferable that it is 5 times or more.

(Effects of the Invention) According to the present invention, the hub is constituted by three mutually separate members: the left and right bearing support portions supported on the axle by respective bearings, and the spoke connection portions that connect the spokes. Since the members are removably fixed to each other, if the spoke connection part is damaged, only the spoke connection part can be replaced with a new one, leaving the other left and right bearing support parts6. The conventional absurdity of having to replace the entire hub when one part is damaged is eliminated.

(Margin below)

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a plan sectional view, Fig. 2 is an overall left side view of the motorcycle, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 is an axle and each cam. Developed perspective view of the plate, No. 5
The figure is V-V! in Figure 1! FIG. 6, a partially cutaway view taken in the direction of arrow I, shows a modification of the brake disc, and corresponds to FIG. 5. l...Motorcycle, la...body frame, ld...rear wheel (axle), 9...axle, 15...left bearing, 16...right bearing, 17...hub, 19. rim, 20... spoke,
22...Left bearing support part, 23...Right bearing support part, 24...
・Spoke connection part.

Claims (1)

[Claims] 1. In a spoked wheel structure in which a hub is rotatably supported on the axle by left and right bearings, and a rim is connected to the hub by spokes, the hub is supported by the left and right bearings on the axle by respective bearings. , a spoke wheel structure that is composed of three separate members, including a spoke connection part that connects the spokes, and these three members are removably fixed to each other.