JPH11348501A - Wheel for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a brake noise from being generated by providing a plurality of resonance systems in which the assembly structure of one spoke group in the motor cycle width direction is different from that of the other spoke group, and setting the resonance frequency of these resonance systems to be in the vicinity of the resonance frequency of a wheel at which the brake noise is generated. SOLUTION: A wheel 1 is rotatably supported by a front fork 2, a tire 8 is mounted on a wheel assembly 7 in which a rim 6 is connected to a hub 3 through spokes 4, 5 on the right and left motor cycle body sides, and a brake disk 9 is fitted to both end parts of the hub 3 in the motor cycle width direction. A resonance system in which the spoke group on the right side of the motor cycle body forms a printing, and a resonance system which the spoke group on the left side of the motor cycle body forms a spring are provided with bearing margins different from each other by spoke group on the right side of the motor cycle body and the spoke group on the left side of the motor cycle body, and the resonance frequency of these resonance systems is set in the vicinity of the resonance frequency of the wheel 1 to generate the brake noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spoke type motorcycle wheel having a brake disk mounted on a hub.

[0002]

2. Description of the Related Art Conventionally, motorcycle wheels have been
In some cases, a rim is connected to a hub via spokes and a brake disc is attached. The spokes include one spoke group and the other spoke group in the vehicle width direction, and are assembled so that the assembly structure (the number and the number of sets) of both spoke groups is the same. Further, the brake disc has an inner peripheral portion attached to one end or both ends in the vehicle width direction of the hub, and a brake pad of a brake caliper contacts an outer peripheral portion.

[0003]

However, in the spoke type motorcycle wheel constructed as described above, a so-called brake squeal sometimes occurs during braking. It is considered that this brake squeal is caused by resonance occurring in the vibration system of the wheel. The vibration system of the wheel can be regarded as a configuration in which, for example, when the rim is on the ground, a spring made of spokes is erected on the ground, and a weight consisting of a hub and a brake disc is attached to the upper end of the spring. That is, the brake disk vibrates together with the hub by the brake operation, and the frequency of the vibration reaches the resonance frequency of the vibration system of the wheel, thereby generating brake squeal.

In order to prevent the occurrence of brake squeal, the applicant of the present application has attached an annular weight to the brake disc via rubber, as disclosed in Japanese Patent Application Laid-Open No. H8-14287, and provided vibration during braking. A brake disc that can attenuate the pressure was proposed.

[0005] However, since this brake disc has a large number of parts due to its weight and rubber, the use of this brake disc increases the manufacturing cost of the wheel.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide an inexpensive motorcycle wheel that does not cause brake squeal.

[0007]

A motorcycle wheel according to the present invention is provided with a plurality of resonance systems by changing the assembly structure between one spoke group and the other spoke group in the vehicle width direction. The resonance frequency of the resonance system is set near the resonance frequency of the wheel where brake squeal occurs.

According to the present invention, since the wheel has a plurality of resonance systems, the vibration energy can be dispersed as compared with a conventional wheel having a single resonance system, and the brake disk serves as a vibration source, and Can cause a reduction in the amplitude at which resonance occurs.

[0009] A motorcycle wheel according to another invention is characterized in that:
In the motorcycle wheel according to the invention described above, the spoke margin and the number of spokes are changed between one spoke group and the other spoke group in the vehicle width direction.
According to the present invention, a plurality of resonance systems can be provided using the members constituting the wheel.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of a motorcycle wheel according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side view showing a part of a motorcycle wheel according to the present invention.
FIG. 3 is a cross-sectional view of a motorcycle wheel according to the present invention, and FIG. 3 is a configuration diagram showing a structure for assembling spokes. FIG. 3 shows a broken position in FIG. 2 by line II-II. FIG. 4 is a cross-sectional view for explaining the next generation.

In these figures, the reference numeral 1 denotes a motorcycle wheel according to this embodiment. The wheel 1 is for a front wheel rotatably supported by a front fork 2. A tire 3 is attached to a wheel assembly 7 having a hub 3 connected to a rim 6 via spokes 4, 5 on the right and left sides of the vehicle body. 2, and brake discs 9 are attached to both ends of the hub 3 in the vehicle width direction, as shown in FIG. The direction in which the wheel 1 rotates during forward movement is indicated by an arrow R in FIGS.

The hub 3 has a cylindrical portion 1 through which an axle 10 passes.
1 and flanges 12 and 13 extending radially outward from both ends of the cylindrical portion 11, and these are integrally formed. The axle 10 is fixed to the front fork 2 and rotatably supports the cylindrical portion 11 via bearings 14 and 15. The flanges 12 and 13 of the hub 3 are provided with an annular brake disk 9 on an outer peripheral portion thereof with fixing bolts 16.
And the spokes 4 and 5 are mounted radially inward of the brake disk mounting portion.

As shown in FIG. 1, the brake disk 9 has a large number of through holes 9a and 9b for heat radiation, and the inner peripheral portion is fixed to the flanges 12 and 1 by the fixing bolts 16.
It is fixed to 3. The brake disc 9 on the left side of the vehicle body and the brake disc 9 on the right side of the vehicle body are formed so as to have the same shape and size, and are mounted on the flanges 12 and 13 with the same mounting structure. The brake caliper 17 which constitutes a hydraulic brake device together with the brake disc 9 has a conventionally well-known structure and is fixed to the front fork 2. The brake caliper 17 on the left side of the vehicle body and the brake caliper 17 on the right side of the vehicle body have the same structure. That is, the brake device is configured to have the same performance on the right and left sides of the vehicle body.

Spokes 4 and 5 for connecting hub 3 and rim 6
Are engaged with the flanges 12 and 13 by engaging the engaging members 4a and 5a formed at the end on the hub 3 side, and screwing the end on the rim 6 side to the nipple 18 engaged with the rim 6. I have. The spokes 4 on the right side of the vehicle body (the left side in FIG. 2) and the spokes 5 on the left side of the vehicle body are assembled so as to form a so-called six-piece set in this embodiment. The six-piece set referred to here is, for example, a spoke on the right side of the vehicle indicated by reference numeral 4R in FIG. 3. For example, in the radial direction from the center of the axle 10 to the rim 6 through the engaging element 4a of the spoke 4R. This means that the nipple 18 of the other six spokes 4 is installed between the imaginary line C extending outward and the nipple 18 to which the spoke 4R is screwed. FIG. 3 shows the spokes 5 on the left side of the vehicle body in a simplified state by thick lines.

The spoke group on the right side of the vehicle body has a different assembly structure from the spoke group on the left side of the vehicle body. In this embodiment, the spokes on the right side of the vehicle body are replaced with the spokes on the left side of the vehicle body. The margin is a dimension indicated by a symbol L in FIG. 4, and is a length of one of two spokes in contact with each other that pushes away the other. Here, the next generation will be described in more detail.

As shown in FIG. 2, three other spokes are pressed against all the spokes of the wheel 1 according to this embodiment. 2 and FIG.
Spoke indicated by R and 3 which contacts this spoke 4R
If the spokes 4 of the book do not touch each other,
Are arranged at the positions shown in FIG. That is, the other three spokes 4 cross the spokes 4R in FIG. Since this does not actually occur, these four spokes are elastically deformed by being pushed by the other spokes at a portion that comes into contact with the other spokes. The length corresponding to the sum of the deformation amount of the spoke 4R and the deformation amount of the other spokes 4 in contact with the spoke 4R is the next generation.

In order to change the margin between the spoke group on the right side of the vehicle body and the spoke group on the left side of the vehicle body, the length L of the spoke 4 that is bent on the hub 3 side is changed.
1 (see FIG. 4) or by changing the position of the spoke attachment hole of the rim 6. The spoke attachment holes are indicated by reference numeral 6a in FIG.

In the motorcycle wheel 1 constructed as described above, the spokes on the right side of the vehicle body and the spokes on the left side of the vehicle body have different replacements between the spokes on the right side of the vehicle body and the spokes on the left side of the vehicle body. And a resonance system in which the spoke group on the left side of the vehicle body becomes a spring.

Accordingly, the energy of the vibration generated by the brake pad (not shown) of the brake carry 17 sliding on the brake disc 9 during braking is caused by the resonance system having the spokes on the right side of the vehicle body and the spokes on the left side of the vehicle body. And a resonance system having For this reason,
Since the vibration energy at the time of resonance can be reduced as compared with a conventional wheel having only one resonance system, and the amplitude at which the wheel 1 resonates is reduced, the wheel 1 prevents brake squeal from occurring. be able to. Moreover, since the occurrence of brake squeal is prevented by using the spokes 4 and 5 constituting the wheel 1, the number of parts does not increase.

Second Embodiment A plurality of resonance systems can be provided by changing the number of spokes between a spoke group on the right side of the vehicle body and a spoke group on the left side of the vehicle body. This embodiment will be described in detail with reference to FIG.

FIG. 5 is a configuration diagram of a wheel showing another embodiment. In the figure, the same or equivalent members as those described in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted. Wheel 1 shown in FIG.
In this example, the spokes 4 on the right side of the vehicle body are assembled so as to form a set of eight, and the spokes 5 on the left side of the vehicle body are assembled so as to form a set of six. For this reason, the spokes 4 on the right side of the vehicle body are longer than the spokes 5 on the left side of the vehicle body.

By changing the number of spokes 4 and 5 between the spoke group on the right side of the vehicle body and the spoke group on the left side of the vehicle body, a plurality of resonance systems are provided on the wheel 1 as in the case of the first embodiment. A brake squeal can be prevented from occurring.

[0023]

[Example] Spokes of spokes 4 and 5 and spokes 4 and 5
6 were obtained by actually manufacturing and testing a wheel in which both of the numbers of groups were changed between the spoke group on the right side of the vehicle body and the spoke group on the left side of the vehicle body. The results shown in FIG. 6 were obtained.

FIG. 6 is a graph showing the relationship between the acceleration response level and the frequency of the motorcycle wheel. In the figure, the characteristics of the wheel according to the present invention are indicated by solid lines, and the characteristics of the conventional wheel are indicated by two-dot chain lines. The acceleration response level is an acceleration frequency response function by hammering, and corresponds to the level of vibration generated during braking (volume at the time of occurrence of brake squeal). In carrying out this comparative test, the same conditions were used except for the structure for assembling the spokes.

As is apparent from FIG. 6, in the wheel 1 according to the present invention, two resonance frequencies B and C appear near the frequency at which brake squeal occurs in the conventional wheel, that is, near the resonance frequency A. . The resonance frequencies B and C are the resonance frequencies of the two resonance systems of the wheel 1. The acceleration response level at the resonance frequencies B and C is lower than the acceleration response level at the resonance frequency A of the conventional wheel. Therefore, by changing the assembling structure of the spokes 4 and 5 between the right side and the left side of the vehicle body, a plurality of resonance systems can be provided on the wheel 1, and the two resonance systems can be provided near the resonance frequency of the conventional wheel which generates brake noise. Since the resonance frequency of the system can be set, the occurrence of brake squeal can be prevented.

It was also found that the acceleration response level was reduced as described above by merely changing the replacement of the spokes 4 and 5 between the spoke group on the right side of the vehicle body and the spoke group on the left side of the vehicle body.

[0027]

As described above, according to the present invention, since a wheel has a plurality of resonance systems, vibration energy can be dispersed as compared with a conventional wheel having a single resonance system, and a brake disk can be provided. Can be used as a vibration source to reduce the amplitude when the wheel causes resonance. Therefore, it is possible to provide a motorcycle wheel that does not generate brake squeal.

According to another invention in which the spokes are replaced or the number of spokes is changed, a plurality of resonance systems can be provided by using members constituting the wheel. Therefore, the number of parts is increased in order to implement the present invention. Never do. Therefore, it is possible to provide an inexpensive motorcycle wheel that does not cause brake squeal.

[Brief description of the drawings]

FIG. 1 is a side view showing a part of a motorcycle wheel according to the present invention.

FIG. 2 is a cross-sectional view of a motorcycle wheel according to the present invention.

FIG. 3 is a configuration diagram showing an assembly structure of a spoke.

FIG. 4 is a cross-sectional view for explaining a next margin.

FIG. 5 is a configuration diagram of a wheel showing another embodiment.

FIG. 6 is a graph showing a relationship between an acceleration response level and a frequency of a motorcycle wheel.

[Explanation of symbols]

1 ... wheel, 3 ... hub, 4, 5 ... spoke, 6 ... rim, 9 ... brake disc.

Claims (3)

[Claims] 1. A motorcycle wheel in which a rim is connected to a hub via spokes and a brake disc is mounted, and resonance is achieved by changing the assembly structure between one spoke group and the other spoke group in the vehicle width direction. A motorcycle wheel, wherein a plurality of systems are provided, and resonance frequencies of these resonance systems are set near a resonance frequency of a wheel at which brake squeal occurs. 2. The motorcycle wheel according to claim 1, wherein a spoke margin is changed between one spoke group and the other spoke group in the vehicle width direction. 3. The motorcycle wheel according to claim 1, wherein the number of spokes is changed between one spoke group and the other spoke group in the vehicle width direction.