DE102017122709A1 - bicycle rim - Google Patents

Abstract

A bicycle rim 7 has a radially outer peripheral portion 11, a radially inner peripheral portion 13, a first side wall 15 and a first anodically produced oxide layer 17. The first anodized oxide layer 17 on a first braking surface 15a has a first roughness Ra equal to or greater than 10 microns. The first anodized oxide layer 17 on a first non-braking surface 15b has a first gloss Gs (60 degrees) equal to or greater than 5.

Description

The present invention relates to a bicycle rim.

Cycling is becoming an increasingly popular form of recreational activity as well as a means of transport. Moreover, cycling has become a very popular competitive sport for both amateurs and professionals.

Whether the bicycle is used as a pastime, for transportation or competition, the bicycle industry is constantly improving the various components of the bicycle. A bicycle component that has been comprehensively redesigned is a bicycle rim. The bicycle rim is configured to contact a brake shoe of the bicycle.

According to the present invention, a bicycle rim has a rotational center axis. The bicycle rim has a radially outer peripheral portion, a radially inner peripheral portion, a first sidewall, and a first anodized oxide layer. The radially inner peripheral portion is disposed radially inward of the radially outer peripheral portion with respect to the rotational center axis. The first side wall is made of aluminum. The first side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The first side wall includes a first braking surface and a first non-braking surface disposed radially inwardly of the first braking surface with respect to the rotational center axis. The first anodized oxide layer is disposed on the first braking surface and the first non-braking surface. The first anodized oxide layer on the first braking surface has a first roughness Ra equal to or greater than 10 microns. The first anodized oxide layer on the first non-braking surface has a first gloss Gs (60 degrees) equal to or greater than 5. With the bicycle rim according to the present invention, in a bicycle rim, the heat dissipation of the first braking surface and the braking performance of the first braking surface in the wet can be improved since the first roughness Ra is equal to or greater than 10 microns. In addition, in the bicycle rim, since the first gloss Gs (60 degrees) is equal to or larger than 5, the designability and drainage of the first non-braking surface can be improved.

In accordance with a preferred aspect of the present invention, the bicycle rim has a second sidewall and a second anodized oxide layer. The second side wall is made of aluminum. The second side wall is spaced from the first side wall in an axis direction with respect to the rotation center axis. The second side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The second side wall includes a second braking surface and a second non-braking surface disposed radially inwardly of the second braking surface with respect to the rotational center axis. The second anodized oxide layer is disposed on the second braking surface and the second non-braking surface. The second anodized oxide layer on the second braking surface has a second roughness Ra equal to or greater than 10 microns. The second anodized oxide layer on the second non-braking surface has a second gloss Gs (60 degrees) equal to or greater than 5. With the bicycle rim according to this aspect, in a bicycle rim, the heat dissipation of the second braking surface and the braking performance of the second braking surface in the wet can be improved since the second roughness Ra is equal to or greater than 10 microns. In addition, in the bicycle rim, since the second gloss Gs (60 degrees) is equal to or greater than 5, the designability and drainage of the second non-braking surface can be improved.

According to a further preferred aspect of the present invention, the bicycle rim is configured such that the first roughness Ra is equal to or greater than 15 microns. With the bicycle rim according to this aspect, in a bicycle rim, the heat dissipation of the first braking surface and the braking performance of the first braking surface in the wet can be further improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the first gloss Gs (60 degrees) is equal to or greater than 20. With the bicycle rim according to this aspect, in a bicycle rim, the designability and drainage of the first non-braking surface can be further improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the second roughness Ra is equal to or greater than 15 microns. With the bicycle rim according to this aspect, in a bicycle rim, the heat dissipation of the second braking surface and the braking performance of the second braking surface in the wet can be further improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the second gloss Gs (60 degrees) is equal to or greater than 20. With the bicycle rim according to this aspect, in a bicycle rim, the designability and drainage of the second non-braking surface can be further improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the first anodized oxide layer and the second anodized oxide layer are bonded to each other via the radially inner peripheral portion. With the bicycle rim according to this aspect, in a bicycle rim, the manufacturing efficiency can be improved because the first anodized oxide layer and the second anodized oxide layer are disposed on the first braking surface and the second braking surface, respectively, in a single process.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one first groove is formed on the first braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be further improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one first groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be further improved.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one second groove is formed on the second braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be further improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one second groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be further improved.

According to another aspect of the present invention, a bicycle rim has a rotational center axis. The bicycle rim has a radially outer peripheral portion, a radially inner peripheral portion, a first sidewall, a first radially outer anodically generated oxide layer, and a first radially inner anodically generated oxide layer. The radially inner peripheral portion is disposed radially inward of the radially outer peripheral portion with respect to the rotational center axis. The first side wall is made of aluminum. The first side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The first side wall includes a first braking surface and a first non-braking surface disposed radially inwardly of the first braking surface with respect to the rotational center axis. The first radially outer anodized oxide layer is disposed on the first braking surface. The first radially outer anodically produced oxide layer has a first layer thickness. The first radially inner anodized oxide layer is disposed on the first non-braking surface. The first radially inner anodically produced oxide layer has a second layer thickness, which is smaller than the first layer thickness. With the bicycle rim according to the present invention, in a bicycle rim, the wear resistance of the first braking surface can be improved because the first layer thickness is greater than the second layer thickness. In addition, in a bicycle rim, the fatigue strength of the first non-braking surface can be improved because the second layer thickness is smaller than the first layer thickness.

According to a preferred aspect of the present invention, the bicycle rim according to the twelfth aspect is formed such that the first layer thickness is equal to or larger than 30 micrometers and equal to or smaller than 100 micrometers. With the bicycle rim according to this aspect, in a bicycle rim, the wear resistance of the first braking surface can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the second layer thickness is equal to or greater than 2.5 micrometers and equal to or less than 10 micrometers. With the Bicycle rim according to this aspect can be improved in a bicycle rim, the fatigue strength of the first non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim further includes a second sidewall, a second radially outer anodized oxide layer, and a second radially inner anodized oxide layer. The second side wall is made of aluminum. The second side wall is spaced from the first side wall in an axis direction with respect to the rotation center axis. The second side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The second side wall includes a second braking surface and a second non-braking surface disposed radially inwardly of the second braking surface with respect to the rotational center axis. The second radially outer anodically produced oxide layer is arranged on the second braking surface. The second radially outer anodically produced oxide layer has a third layer thickness. The second radially inner anodized oxide layer is disposed on the second non-braking surface. The second radially inner anodically produced oxide layer has a fourth layer thickness, which is smaller than the third layer thickness. With the bicycle rim according to this aspect, in a bicycle rim, the wear resistance of the second braking surface can be improved since the third layer thickness is larger than the fourth layer thickness. In addition, in a bicycle rim, the fatigue strength of the second non-braking surface can be improved because the fourth layer thickness is smaller than the third layer thickness.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the third layer thickness is equal to or greater than 30 microns and equal to or less than 100 microns. With the bicycle rim according to this aspect, in a bicycle rim, the wear resistance of the second braking surface can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the fourth layer thickness is equal to or greater than 2.5 micrometers and equal to or less than 10 micrometers. With the bicycle rim according to this aspect, in a bicycle rim, the fatigue strength of the second non-braking surface can be improved.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured such that the first radially outer anodized oxide layer is different from the first radially inner anodized oxide layer. With the bicycle rim according to this aspect, the characteristics of the first braking surface can be distinguished from the characteristics of the first non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured so that the second radially outer anodized oxide layer is different from the second radially inner anodized oxide layer. With the bicycle rim according to this aspect, the characteristics of the second braking surface can be distinguished from the characteristics of the second non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured such that the first radially outer anodized oxide layer is different from the first radially inner anodized oxide layer. The second radially outer anodically produced oxide layer differs from the second radially inner anodically produced oxide layer. With the bicycle rim according to this aspect, the characteristics of the first and second braking surfaces can be distinguished from the characteristics of the first and second non-braking surfaces.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one first groove is formed on the first braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one first groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be further improved.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one second groove is formed on the second braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be improved.

According to another preferred aspect of the present invention, the bicycle rim according to the twenty-third aspect is formed such that the at least one second groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be further improved.

According to another aspect of the present invention, a bicycle rim has a rotational center axis. The bicycle rim has a radially outer peripheral portion, a radially inner peripheral portion, a first sidewall, a first radially outer anodically generated oxide layer, and a first radially inner anodically generated oxide layer. The radially inner peripheral portion is disposed radially inward of the radially outer peripheral portion with respect to the rotational center axis. The first side wall is made of aluminum. The first side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The first side wall includes a first braking surface and a first non-braking surface disposed radially inwardly of the first braking surface with respect to the rotational center axis. The first radially outer anodized oxide layer is disposed on the first braking surface. The first radially outer anodized oxide layer has a first emissivity. The first radially inner anodized oxide layer is disposed on the first non-braking surface. The first radially inner anodized oxide layer has a second emissivity that is greater than the first emissivity. With the bicycle rim according to this aspect, in a bicycle rim, the heat dissipation of the first Braking surface and the first non-braking surface can be improved. Since the first radially outer anodized oxide layer has the first emissivity and the first radially inner anodized oxide layer has the second emissivity greater than the first emissivity, the heat of the first braking surface may be radiated over the first non-braking surface.

According to another preferred aspect of the present invention, the bicycle rim is configured such that the first emissivity is less than 81%. With the bicycle rim according to this aspect, the heat of the first braking surface can be radiated over the first non-braking surface.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the second emissivity is equal to or greater than 81%. With the bicycle rim according to this aspect, in a bicycle rim, the heat dissipation of the first braking surface and the first non-braking surface can be improved.

In accordance with another preferred aspect of the present invention, the bicycle rim further includes a second sidewall, a second radially outer anodized oxide layer, and a second radially inner anodized oxide layer. The second side wall is made of aluminum. The second side wall is spaced from the first side wall in an axis direction with respect to the rotation center axis. The second side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The second side wall includes a second braking surface and a second non-braking surface disposed radially inwardly of the second braking surface with respect to the rotational center axis. The second radially outer anodically produced oxide layer is arranged on the second braking surface. The second radially outer anodized oxide layer has a third emissivity. The second radially inner anodized oxide layer is disposed on the second non-braking surface. The second radially inner anodized oxide layer has a fourth emissivity greater than the third emissivity. With the bicycle rim according to this aspect, in a bicycle rim, the heat dissipation of the second braking surface and the second non-braking surface can be improved. Since the second radially outer anodized oxide layer has the third emissivity and the second radially inner anodized oxide layer has the fourth emissivity, the heat of the second braking surface can be radiated over the second non-braking surface.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the third emissivity is less than 81%. With the bicycle rim according to this aspect, the heat of the second braking surface can be radiated via the second non-braking surface.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the fourth emissivity is equal to or greater than 81%. With the bicycle rim according to this aspect, in a bicycle rim, the heat dissipation of the second braking surface and the second non-braking surface can be improved.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured such that the first radially outer anodized oxide layer is different from the first radially inner anodized oxide layer. With the bicycle rim according to this aspect, the characteristics of the first braking surface can be distinguished from the characteristics of the first non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured so that the second radially outer anodized oxide layer is different from the second radially inner anodized oxide layer. With the bicycle rim according to this aspect, the characteristics of the second braking surface can be distinguished from the characteristics of the second non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured such that the first radially outer anodized oxide layer is different from the first radially inner anodized oxide layer. The second radially outer anodically produced oxide layer differs from the second radially inner anodically produced oxide layer. With the bicycle rim according to this aspect, the characteristics of the first and second braking surfaces can be distinguished from the characteristics of the first and second non-braking surfaces.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one first groove is formed on the first braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one first groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be further improved.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one second groove is formed on the second braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one second groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be further improved.

According to another aspect of the present invention, the bicycle rim has a rotational center axis. The bicycle rim has a radially outer peripheral portion, a radially inner peripheral portion, a first sidewall, a first radially outer anodically generated oxide layer, and a first radially inner anodically generated oxide layer. The radially inner peripheral portion is disposed radially inward of the radially outer peripheral portion with respect to the rotational center axis. The first side wall is made of aluminum. The first side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The first side wall includes a first braking surface and a first non-braking surface disposed radially inwardly of the first braking surface with respect to the rotational center axis. The first radially outer anodized oxide layer is disposed on the first braking surface. The first radially outer anodized oxide layer has a first hardness. The first radially inner anodized oxide layer is disposed on the first non-braking surface. The first radially inner anodized oxide layer has a second hardness that is less than the first hardness. With the bicycle rim according to this aspect, in a bicycle rim, since the first hardness is greater than the second hardness, the wear resistance of the first braking surface can be improved. In addition, in a bicycle rim, the fatigue strength of the first non-braking surface can be improved because the second hardness is smaller than the first hardness.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the first hardness is equal to or greater than 300 Hv and equal to or less than 600 Hv. With the bicycle rim according to this aspect, in a bicycle rim, the wear resistance of the first braking surface can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the second hardness is equal to or greater than 150 Hv and equal to or less than 250 Hv. With the bicycle rim according to this aspect, in a bicycle rim, the fatigue strength of the first non-braking surface can be improved.

In accordance with another preferred aspect of the present invention, the bicycle rim further includes a second sidewall, a second radially outer anodized oxide layer, and a second radially inner anodized oxide layer. The second side wall is made of aluminum. The second side wall is spaced from the first side wall in an axis direction with respect to the rotation center axis. The second side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The second side wall includes a second braking surface and a second non-braking surface disposed radially inwardly of the second braking surface with respect to the rotational center axis. The second radially outer anodically produced oxide layer is arranged on the second braking surface. The second radially outer anodized oxide layer has a third hardness. The second radially inner anodized oxide layer is disposed on the second non-braking surface. The second radially inner anodized oxide layer has a fourth hardness that is less than the third hardness. With the bicycle rim according to the forty-first aspect, in a bicycle rim, since the third hardness is greater than the fourth hardness, the wear resistance of the second braking surface can be improved. In addition, in a bicycle rim, the fatigue strength of the second non-braking surface can be improved since the fourth hardness is smaller than the third hardness.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the third hardness is equal to or greater than 300 Hv and equal to or less than 600 Hv. With the bicycle rim according to this aspect, in a bicycle rim, the wear resistance of the second braking surface can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the fourth hardness is equal to or greater than 150 Hv and equal to or less than 250 Hv. With the bicycle rim according to this aspect, in a bicycle rim, the fatigue strength of the second non-braking surface can be improved.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured such that the first radially outer anodized oxide layer is different from the first radially inner anodized oxide layer. With the bicycle rim according to this aspect, the characteristics of the first braking surface can be distinguished from the characteristics of the first non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured so that the second radially outer anodized oxide layer is different from the second radially inner anodized oxide layer. With the bicycle rim according to this aspect, the characteristics of the second braking surface can be distinguished from the characteristics of the second non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured such that the first radially outer anodized oxide layer is different from the first radially inner anodized oxide layer. The second radially outer anodically produced oxide layer differs from the second radially inner anodically produced oxide layer. With the bicycle rim according to this aspect, the characteristics of the first and second braking surfaces can be distinguished from the characteristics of the first and second non-braking surfaces.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one first groove is formed on the first braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one first groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be further improved.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one second groove is formed on the second braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one second groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be further improved.

According to another aspect of the present invention, a bicycle rim has a rotational center axis. The bicycle rim has a radially outer peripheral portion, a radially inner peripheral portion, a first sidewall, a first radially outer anodically generated oxide layer, and a first radially inner anodically generated oxide layer. The radially inner peripheral portion is disposed radially inward of the radially outer peripheral portion with respect to the rotational center axis. The first side wall is made of aluminum. The first side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The first side wall includes a first braking surface and a first non-braking surface disposed radially inwardly of the first braking surface with respect to the rotational center axis. The first radially outer anodized oxide layer is disposed on the first braking surface. The first radially outer anodically generated oxide layer has a first brightness (L *). The first radially inner anodized oxide layer is disposed on the first non-braking surface. The first radially inner anodically generated oxide layer has a second brightness (L *) which is smaller than the first brightness (L *). With the bicycle rim according to this aspect, in a bicycle rim, heat generated on the first braking surface can be transmitted from the first braking surface to the first non-braking surface. Since the first radially outer anodized oxide layer has a first brightness and the first radially inner anodized oxide layer has the second brightness less than the first brightness, the heat of the first braking surface can be radiated over the first non-braking surface.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the first brightness (L *) is equal to or greater than 26.5 and equal to or less than 35. With the bicycle rim according to this aspect, in a bicycle rim, the heat can be transmitted from the first braking surface to the first non-braking surface.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the second brightness (L *) is equal to or greater than 20 and equal to or less than 26. With the bicycle rim according to this aspect, in a bicycle rim, the heat from the first braking surface can be further transmitted to the first non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim further includes a second sidewall, a second radially outer anodized oxide layer, and a second radially inner anodized oxide layer. The second side wall is made of aluminum. The second side wall is spaced from the first side wall in an axis direction with respect to the rotation center axis. The second side wall extends between the radially outer peripheral portion and the radially inner peripheral portion. The second Sidewall includes a second braking surface and a second non-braking surface disposed radially inwardly of the second braking surface with respect to the rotational center axis. The second radially outer anodically produced oxide layer is arranged on the second braking surface. The second radially outer anodically generated oxide layer has a third brightness (L *). The second radially inner anodized oxide layer is disposed on the second non-braking surface. The second radially inner anodically generated oxide layer has a fourth brightness (L *) smaller than the third brightness (L *). With the bicycle rim according to this aspect, in a bicycle rim, heat generated on the second braking surface can be transmitted from the second braking surface to the second non-braking surface. Since the second radially outer anodized oxide layer has the third brightness and the second radially inner anodized oxide layer has the fourth brightness smaller than the second brightness, the heat of the second braking surface can be radiated via the second non-braking surface.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the third brightness (L *) is equal to or greater than 26.5 and equal to or less than 35. With the bicycle rim according to this aspect, in a bicycle rim, the heat can be transmitted from the second braking surface to the second non-braking surface.

According to another preferred aspect of the present invention, the bicycle rim is formed such that the fourth brightness (L *) is equal to or greater than 20 and equal to or less than 26. With the bicycle rim according to this aspect, in a bicycle rim, the heat from the second braking surface can be further transmitted to the second non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured such that the first radially outer anodized oxide layer is different from the first radially inner anodized oxide layer. With the bicycle rim according to this aspect, the characteristics of the first braking surface can be distinguished from the characteristics of the first non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured so that the second radially outer anodized oxide layer is different from the second radially inner anodized oxide layer. With the bicycle rim according to this aspect, the characteristics of the second braking surface can be distinguished from the characteristics of the second non-braking surface.

In accordance with another preferred aspect of the present invention, the bicycle rim is configured such that the first radially outer anodized oxide layer is different from the first radially inner anodized oxide layer. The second radially outer anodically produced oxide layer differs from the second radially inner anodically produced oxide layer. With the bicycle rim according to this aspect, the characteristics of the first and second braking surfaces can be distinguished from the characteristics of the first and second non-braking surfaces.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one first groove is formed on the first braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one first groove is a single spiral groove. With the bicycle rim according to this first aspect, in a bicycle rim, the braking performance of the first braking surface in the wet can be further improved.

According to a further preferred aspect of the present invention, the bicycle rim is formed such that at least one second groove is formed on the second braking surface. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be improved.

According to another preferred aspect of the present invention, the bicycle rim is formed so that the at least one second groove is a single spiral groove. With the bicycle rim according to this aspect, in a bicycle rim, the braking performance of the second braking surface in the wet can be further improved.

• 1 eine Seitenansicht einer Fahrrad-Rad-Baueinheit gemäß einer ersten Ausführungsform der vorliegenden Erfindung ist;
• 2 eine teilweise vergrößerte Querschnittsansicht der Fahrrad-Rad-Baueinheit gemäß der ersten Ausführungsform der vorliegenden Erfindung ist;
• 3 ein Musterdiagramm zur Erläuterung einer Behandlung der Fahrradfelge ist;
• 4A ein Musterdiagramm zur Erläuterung einer Behandlung der Fahrradfelge als eine Variation der ersten Ausführungsform ist;
• 4B ein Musterdiagramm zur Erläuterung einer Behandlung der Fahrradfelge als eine Variation der ersten Ausführungsform ist;
• 5 eine teilweise vergrößerte Querschnittsansicht der Fahrrad-Rad-Baueinheit gemäß einer zweiten Ausführungsform der vorliegenden Erfindung ist;
• 6 ein Musterdiagramm zur Erläuterung einer Behandlung der Fahrradfelge ist;
• 7A ein Musterdiagramm zur Erläuterung einer Behandlung der Fahrradfelge als eine Variation der zweiten Ausführungsform ist;
• 7B ein Musterdiagramm zur Erläuterung einer Behandlung der Fahrradfelge als eine Variation der zweiten Ausführungsform ist; und
• 7C ein Musterdiagramm zur Erläuterung einer Behandlung der Fahrradfelge als eine Variation der zweiten Ausführungsform ist.

Hereinafter, selected embodiments of the present invention will be described with reference to the drawings, wherein FIG

• 1 a side view of a bicycle-wheel assembly according to a first embodiment of the present invention;
• 2 is a partially enlarged cross-sectional view of the bicycle-wheel assembly according to the first embodiment of the present invention;
• 3 Fig. 3 is a pattern diagram for explaining a treatment of the bicycle rim;
• 4A Fig. 4 is a pattern diagram for explaining a treatment of the bicycle rim as a variation of the first embodiment;
• 4B Fig. 4 is a pattern diagram for explaining a treatment of the bicycle rim as a variation of the first embodiment;
• 5 a partially enlarged cross-sectional view of the bicycle-wheel assembly according to a second embodiment of the present invention;
• 6 Fig. 3 is a pattern diagram for explaining a treatment of the bicycle rim;
• 7A Fig. 4 is a pattern diagram for explaining a treatment of the bicycle rim as a variation of the second embodiment;
• 7B Fig. 4 is a pattern diagram for explaining a treatment of the bicycle rim as a variation of the second embodiment; and
• 7C is a pattern diagram for explaining a treatment of the bicycle rim as a variation of the second embodiment.

It will be apparent to those skilled in the art from this disclosure that the following descriptions of the embodiments of the present technology are intended for purposes of illustration only and are not intended to limit the technology as defined by the appended claims and their equivalents.

In this embodiment, the directional indications "forward," "backward," "left," "right," "up," "down," "up," and "down," as well as other similar directional indications, refer to those directions described with respect to FIG a cyclist sitting on a bicycle saddle (not shown) of a bicycle facing the bicycle handlebar (not shown).

Now, a bicycle wheel assembly will be described below 1 described according to a first embodiment. As in 1 is shown, the bicycle wheel assembly 1 a hub 3 , a plurality of spokes 5 and the bicycle rim 7 on. The hub 3 is radial from the bicycle rim 7 with respect to a rotational center axis C1 the bicycle wheel assembly 1 arranged inwards. The hub 3 is mounted on a bicycle frame (not shown).

The majority of spokes 5 is between the hub 3 and the bicycle rim 7 in a radial direction with respect to the rotational center axis C1 arranged. A radially inner end of the spoke 5 is at the hub 3 attached, and a radially outer end of the spoke 5 is at the bicycle rim 7 attached.

As in 1 shown is the bicycle rim 7 formed substantially annular. A tire 9 is at the bicycle rim 7 assembled. The majority of spokes 5 is at the bicycle rim 7 attached as described above. The bicycle rim 7 has a rotational center axis. The central axis of rotation of the bicycle rim 7 is coaxial with the rotational center axis C1 the hub.

As in 2 is shown has the bicycle rim 7 a radially outer peripheral portion 11 a radially inner peripheral portion 13 , a first sidewall 15 and a first anodized oxide layer 17 on. The bicycle rim 7 also has a second side wall 19 and a second anodized oxide layer 21 on.

The bicycle rim 7 may also be a third anodically generated oxide layer 24 exhibit. The bicycle rim 7 may further comprise a connecting portion 23 exhibit. The bicycle rim 7 is made of aluminum.

As in 2 is shown, is the radially outer peripheral portion 11 radially from the radially inner peripheral portion 13 with respect to the rotational center axis C1 arranged to the outside.

The radially outer peripheral portion 11 includes a first radially outer peripheral portion 11a and a second radially outer peripheral portion 11b , The first radially outer peripheral portion 11a is formed substantially annular. The first radially outer peripheral portion 11a partially protrudes from the first side wall 15 in the direction of the second radially outer peripheral portion 11b in an axis direction with respect to the rotational center axis C1 out.

The second radially outer peripheral portion 11b is formed substantially annular. The second radially outer peripheral portion 11b partially protrudes from the second side wall 19 in the direction of the first radially outer peripheral portion 11a in the axis direction with respect to the rotational center axis C1 out.

The first and second radially outer peripheral portions 11a . 11b are at a distance from each other in the axis direction with respect to the rotation center axis C1 arranged. The mature 9 is between the first and second radially outer peripheral portions 11a . 11b in the axis direction with respect to the rotational center axis C1 assembled.

As in 2 is shown, is the radially inner peripheral portion 13 radially from the radially outer peripheral portion 11 with respect to the rotational center axis C1 arranged inwards.

The radially inner peripheral portion 13 is between the first sidewall 15 and the second side wall 19 in the axis direction with respect to the rotational center axis C1 arranged. The radially inner peripheral portion 13 is integral with the first and second radially outer peripheral portions in this embodiment 11a . 11b and the first and second side walls 15 . 19 educated.

The radially inner peripheral portion 13 contains a plurality of first openings 13a , The majority of first openings 13a is at intervals in a circumferential direction with respect to the rotational center axis C1 arranged.

The first openings 13a are through-holes, each of which is the radially inner peripheral portion 13 in the radial direction with respect to the rotational center axis C1 penetrate.

The radially outer end of the spoke 5 is in the first openings 13a arranged. The radially outer end of the spoke 5 is at the radially inner peripheral portion 13 z. B. with a nipple (not shown) attached.

The first side wall 15 is made of aluminum. As in 2 is shown, the first side wall runs 15 between the radially outer peripheral portion 11 and the radially inner peripheral portion 13 , Specifically, the first side wall runs 15 between the first radially outer peripheral portion 11a and the radially inner peripheral portion 13 in the radial direction with respect to the rotational center axis C1 ,

The first side wall 15 contains a first braking surface 15a and a first non-braking surface 15b that is radial from the first braking surface 15a with respect to the rotational center axis C1 is arranged inside.

The first braking surface 15a is configured to contact a brake shoe of the bicycle during a braking operation. The first braking surface 15a is an axially outer surface of the first side wall 15 and is arranged so that it is on the first side wall 15 extends radially outward. The first braking surface 15a is preferably annular.

At least a first groove 15c is on the first braking surface 15a educated. For example, the at least one first groove 15c preferably a single spiral groove. Alternatively, the at least one first groove 15c comprise a plurality of grooves. For example, the at least one first groove 15c comprise a plurality of annular grooves.

In this embodiment, the first groove extends 15c as the single spiral groove spirally in the circumferential direction with respect to the rotational center axis C1 , The first groove 15c facilitates water drainage on the first braking surface 15a during a braking operation. Consequently, the braking performance is improved in the wet through the room.

The first non-braking surface 15b is designed so that it does not contact the brake shoe of the bicycle. The first non-braking surface 15b is an axially outer surface of the first side wall 15 and is arranged so that it is radially on the first side wall 15 runs inwards. The first non-braking surface 15a is preferably annular.

A height difference is preferably between the first braking surface 15a and the first non-braking surface 15b educated. The height difference is in the circumferential direction with respect to the rotation center axis C1 , The height difference between the first braking surface 15a and the first non-braking surface 15b ranges from 0.8 mm to 1.2 mm. For example, the height difference between the first braking surface 15a and the first non-braking surface 15b 1.0 mm.

Such a height difference between the first braking surface 15a and the first non-braking surface 15b but does not have to be formed.

As in 2 is the first anodized oxide layer 17 on the first braking surface 15a and the first non-braking surface 15b arranged. The first anodized oxide layer 17 can with the second anodized oxide layer 21 over the radially inner peripheral portion 13 be connected. In other words, the first anodized oxide layer 17 and the second anodized oxide layer 21 are connected to each other via the radially inner peripheral portion 13 connected.

Specifically, the first anodized oxide layer becomes 17 on the first braking surface 15a and the first non-braking surface 15b after cutting the first braking surface 15a and the first non-braking surface 15b the first side wall 15 educated. The following is the anodizing treatment for the first anodized oxide layer 17 described in detail.

The second side wall 19 is made of aluminum. As in 2 is shown is the second side wall 19 from the first side wall 15 in the axis direction with respect to the rotational center axis C1 spaced.

The second side wall 19 extends between the radially outer peripheral portion 11 and the radially inner peripheral portion 13 , Specially runs the second side wall 19 between the second radially outer peripheral portion 11b and the radially inner peripheral portion 13 in the radial direction with respect to the rotational center axis C1 ,

The second side wall 19 contains a second braking surface 19a and a second non-braking surface 19b that is radial from the second braking surface 19a with respect to the rotational center axis C1 is arranged inside.

The second braking surface 19a is configured to contact the brake shoe of the bicycle during a braking operation. The second braking surface 19a is an axially outer surface of the second side wall 19 and arranged so as to be radially on the second side wall 19 goes to the outside. The second braking surface 19a is preferably annular.

At least one second groove 19c is on the second braking surface 19a educated. For example, the at least one second groove 19c preferably a single spiral groove. Alternatively, the at least one first groove 15c contain a plurality of grooves. For example, the at least one first groove 15c include a plurality of annular grooves.

In this embodiment, the second groove extends 19c as the single spiral groove spirally in the circumferential direction with respect to the rotational center axis C1 , The second groove 19c facilitates water drainage on the second braking surface 19a during a braking operation. Consequently, the braking performance is improved in the wet through the room.

The second non-braking surface 19b is designed so that it does not contact the brake shoe of the bicycle. The second non-braking surface 19b is an axially outer surface of the second side wall 19 and arranged so as to be radially on the second side wall 19 runs inwards. The first non-braking surface 15a is preferably annular.

A height difference is preferably between the second braking surface 19a and the second non-braking surface 19b educated. The height difference is in the circumferential direction with respect to the rotation center axis C1 , The height difference between the second braking surface 19a and the second non-braking surface 19b is 0.8 mm to 1.2 mm. For example, the height difference between the second braking surface 19a and the second non-braking surface 19b 1.0 mm. Such a height difference between the second braking surface 19a and the second non-braking surface 19b but does not have to be formed.

As in 2 is shown is the second anodized oxide layer 21 on the second braking surface 19a and the second non-braking surface 19b arranged. The second anodized oxide layer 21 can with the first anodized oxide layer 17 over the radially inner peripheral portion 13 be connected. Specifically, the second anodized oxide layer 21 with the first anodized oxide layer 17 via the third anodically produced oxide layer 24 be connected.

For example, the second anodized oxide layer 21 on the second braking surface 19a and the second non-braking surface 19b after cutting the second braking surface 19a and the second non-braking surface 19b the second side wall 19 educated. The following is the anodizing treatment for the second anodized oxide layer 21 described in detail.

As in 2 is shown, the third anodized oxide layer 24 on the radially inner peripheral portion 13 be arranged. The third anodically generated oxide layer 24 is on the radially inner peripheral portion 13 educated.

The third anodically generated oxide layer 24 can with the first and second anodized oxide layer 17 . 21 be connected. For example, the third anodically produced oxide layer 24 integral with the first and second anodized oxide layers 17 . 21 after cutting an outer surface of the third anodized oxide layer 24 be formed. The following is the anodizing treatment for the third anodized oxide layer 24 described in detail.

The connecting section 23 is designed to be the first sidewall 15 and the second side wall 19 combines. The connecting section 23 is preferably annular. The connecting section 23 is between the first sidewall 15 and the second side wall 19 in the axis direction with respect to the rotational center axis C1 arranged. The connecting section 23 is integral with the first side wall in this embodiment 15 and the second side wall 19 educated.

The connecting section 23 contains a plurality of second openings 23a , The majority of second openings 23a is at intervals in the circumferential direction with respect to the rotational center axis C1 arranged.

The second opening 23a is arranged so that it is the first opening 13a in the radial Direction with respect to the rotational center axis C1 is facing. The second opening 23a is a through hole that connects the connecting section 23 in the radial direction with respect to the rotational center axis C1 penetrates.

A tool (not shown) is inserted into the second opening 23a from a radially outer side of the connecting portion 23 in the direction of a radially inner side of the connecting portion 23 with respect to the rotational center axis C1 introduced. In this state, the radially outer end of the spoke 5 at the first opening 13a the radially inner peripheral portion 13 attached to the tool via a nipple (not shown).

As in 3 is shown, the anodizing treatment on the bicycle rim 7 carried out as follows. First, a cutting treatment on the first braking surface 15a and the second braking surface 19a for forming at least a first groove 15c and at least one second groove 19c at the first braking surface 15a or the second braking surface 19a carried out ( S11 ). In the cutting treatment, the first groove 15c and the second groove 19c , which are preferably individual spiral grooves, on the first braking surface 15a or the second braking surface 19a educated.

Second, a degreasing treatment on the bicycle rim 7 carried out ( S12 ). For example, the degreasing treatment on at least the first side wall 15 (eg the first braking surface 15a and the first non-braking surface 15b) and the second side wall 19 (eg the second braking surface 19a and the second non-braking surface 19b) carried out.

Specifically, in the degreasing treatment, the bicycle rim 7 immersed in phosphate solution at 60 degrees Celsius for 10 minutes. This will make the outer surface of the bicycle rim 7 degreased.

As a result, for example, the degreasing treatment on the outer surfaces of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 , the first side wall 15 , the second side wall 19 and the connection section 23 carried out.

The degreasing treatment may be performed after performing the surface-roughening treatment on, for example, the first and second sidewalls 15 . 19 , the first braking surface 15a and the second braking surface 19a with a device such as a blasting device or a laser processing device.

Third, the oxide-forming anodizing treatment becomes on the bicycle rim 7 carried out ( S13 ). For example, the oxide-generating anodizing treatment becomes on at least the first side wall 15 (eg the first braking surface 15a and the first non-braking surface 15b) and the second side wall 19 (eg the second braking surface 19a and the second non-braking surface 19b) carried out. (N) in ( S13 ) from 3 is a symbol that indicates the alumite layer with natural color appearance.

Specifically, in the oxide-generating anodizing treatment, the bicycle rim becomes 7 immersed in a solution containing 0.1% - 5.0% sulfuric acid and 5% - 20% organic acid, under the conditions of temperature: 0 to 20 degrees Celsius, current density: 1 - 20 A / dm ² and electrolysis time: 30 Minutes or more.

Thereby, for example, the oxide-generating anodizing treatment becomes on the outer surfaces of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 , the first side wall 15 , the second side wall 19 and the connection section 23 carried out.

Finally, a drying treatment on the bicycle rim 7 carried out ( S14 ). Specifically, in the drying treatment, the bicycle rim 7 contained in a drying oven at 100 degrees Celsius for 30 minutes.

By the above treatments, the first anodized oxide layer becomes 17 and the second anodized oxide layer 21 , For example, Alumitschichten with natural color appearance, on the first sidewall 15 and the second sidewall formed.

In this embodiment, the third anodized oxide layer 24 For example, the alumite layer with natural color appearance, on the radially inner peripheral portion 13 be formed. The natural color appearance alumite layer may be on the radially outer peripheral portion 11 and the connection section 23 be formed.

The first anodized oxide layer 17 that is formed by the above treatments includes the following properties.

The first anodized oxide layer 17 on the first braking surface 15a has a first roughness Ra that is equal to or greater than 10 microns. Preferably, the first roughness Ra equal to or greater than 15 microns. In this embodiment, the first roughness is Ra for example, 20 microns.

The second anodized oxide layer 21 on the second braking surface 19a has a second roughness Ra that is equal to or greater than 10 microns. Preferably, the second roughness Ra equal to or greater than 15 microns. In this Embodiment is the second roughness Ra for example, 20 microns.

In this embodiment, the first and second roughnesses become Ra obtained with a ten-point average roughness as follows. The outer surfaces of both the first and second anodically-generated oxide layers 17 . 21 are given an approximate formula f (x) in the predetermined range L approximated in it.

berechnet.The first and second roughness Ra (N) is given by the formula: $$\text{Ra}\left(\text{N}\right)={\displaystyle \int \left|\text{f}\left(\text{x}\right)\right|}\text{dx}/\text{L}.0\le \text{x}\le \text{L}$$

calculated.

berechnet.The first and second roughness Ra (N) is calculated at ten points. The first and second roughness Ra is with the formula: $$\text{Ra}=\text{Ra}\left(\text{N}\right)/\text{N}.\text{N}=10$$

calculated.

In this first and second anodized oxide layer 17 . 21 It may be at random from the bicycle rim 7 act selected samples.

The first anodized oxide layer 17 on the first non-braking surface 15b has a first shine gs (60 degrees) equal to or greater than 5. Preferably, the first gloss is gs (60 degrees) is equal to or greater than 20. In this embodiment, the first gloss is gs (60 degrees) for example 28.

The second anodized oxide layer 21 on the second non-braking surface 19b has a second shine gs (60 degrees) equal to or greater than 5. Preferably, the second gloss is gs (60 degrees) is equal to or greater than 20. In this embodiment, the second gloss is gs (60 degrees) for example 28.

berechnet.In this embodiment, the first and second glosses become gs (60 degrees) with reflected light flux Fs defined by measurement criterion Fos. For example, the first and second shine gs (60 degrees) with the formula: $$\text{gs}\left(60\text{Degree}\right)=\left(\text{fs}/\text{Fos}\right)*100$$

calculated.

The measurement criterion Fos corresponds to the luminous flux of a glass surface reflected by the mirror surface when the refractive index is 1.567. The reflected light flux Fs also corresponds to the measured light flux.

For example, at first light flux from a light source strikes the outer surface of both the first and second anodically produced oxide layers 17 . 21 at 60 degrees. Then, the reflected light flux Fs becomes that of the outer surface of each of the first and second anodically-generated oxide layers 17 . 21 at 60 degrees, measured with a light receiver.

The light flux measured with the light receiver is the light flux measured above. In this first and second anodized oxide layer 17 . 21 It may be at random from the bicycle rim 7 act selected samples.

In addition, the third anodically produced oxide layer 24 have the same characteristics as the first and second roughness Ra and the first and second shine gs (60 degrees).

As a variation of the first embodiment, for example, the oxide-generating anodization treatment (S13a) may be performed between the degreasing treatment (FIG. S12 ) and the drying treatment ( S14 ) are carried out as follows.

As in 4A is shown, in the oxide-generating anodization treatment (S13a), the bicycle rim 7 immersed in a solution containing 5.0% -20% sulfuric acid under the conditions of temperature: 10 degrees Celsius or less, current density: 5-20 A / dm ^2, and electrolysis time: 30 minutes or more.

By the above treatments, the first anodized oxide layer becomes 17 and the second anodized oxide layer 21 , which are for example hard Alumitschichten, on the first side wall 15 and the second side wall 19 educated.

The third anodically generated oxide layer 24 For example, the hard alumite layer may be on the radially inner peripheral portion 13 be formed. (H) in (S13a) of 4A is a symbol that indicates the hard alumite layer.

As a variation of the first embodiment, for example, the following oxide generation anodization treatment (S13b) and color electrolytic treatment (S13c) may be performed between the degreasing treatment (S13b). S12 ) and the drying treatment ( S14 ) be performed.

In this case, as in 4B In the oxide generation anodization treatment (S13b), the bicycle rim is shown 7 immersed in a solution containing 5.0% 20% sulfuric acid under the conditions of temperature: 20-30 degrees Celsius, current density: 1-5 A / dm ² and electrolysis time: 30 minutes or more.

In the electrolytic coloring treatment (S13c), the bicycle rim becomes 7 immersed in an electrolytic solution containing 15-35 g / l of nickel sulfate, 20-40 g / l of boric acid and 10-20 g / l of ammonium sulfate under the conditions of AC electrolysis: 10 volts or more, treatment time: 2-15 minutes or more and bath temperature: 10 to 30 degrees Celsius.

By the above treatments, the first anodized oxide layer becomes 17 and the second anodized oxide layer 21 For example, alumite layers with black color appearance, on the first side wall 15 and the second side wall 19 educated.

The third anodically generated oxide layer 24 For example, the alumite layer with black color appearance, on the radially inner peripheral portion 13 be formed.

As in 1 shown is the bicycle wheel assembly 101 according to a second embodiment described below. The bicycle wheel assembly 101 contains a hub 3 , a plurality of spokes 5 and the bicycle rim 107 ,

The bicycle wheel assembly 101 has substantially the same structures as the bicycle wheel assembly 1 , apart from the bicycle rim 107 , Thus, the elements having substantially the same function as in the first embodiment are given the same reference numerals as the bicycle wheel assembly 1 , A description of these elements is omitted here. In addition, the description of the first embodiment will be applied to the description of these elements.

As in 1 shown is the bicycle rim 107 formed substantially annular. A tire 9 is at the bicycle rim 107 assembled. The majority of spokes 5 is at the bicycle rim 107 attached. The bicycle rim 107 has the rotation center axis C1 ,

As in 5 is shown has the bicycle rim 107 a radially outer peripheral portion 11 a radially inner peripheral portion 13 , a first sidewall 15 , a first radially outer anodically generated oxide layer 27 and a first radially inner anodized oxide layer 29 on.

The bicycle rim 107 also has a second side wall 19 , a second radially outer anodized oxide layer 31 and a second radially inner anodized oxide layer 33 on. The bicycle rim 107 may also be a third anodically generated oxide layer 24 exhibit. The bicycle rim 107 also has a connection section 23 on. The bicycle rim 107 is made of aluminum.

In the embodiment of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 , the first side wall 15 , the second side wall 19 , the connection section 23 and the third anodized oxide layer 24 in the second embodiment, they are substantially the same structures as in the first embodiment. On a description of the design is omitted here.

As in 5 is the first radially outer anodized oxide layer 27 on the first braking surface 15a arranged. The first radially outer anodically generated oxide layer 27 is on the first braking surface 15a educated.

The first radially outer anodically generated oxide layer 27 is between the radially outer peripheral portion 11 and the first non-braking surface 15b in the radial direction with respect to the rotational center axis C1 arranged. By way of example, the first radially outer anodically produced oxide layer is 27 between the first radially outer peripheral portion 11a and the first radially inner anodized oxide layer 29 in the radial direction with respect to the rotational center axis C1 arranged.

The first radially outer anodically generated oxide layer 27 can with the first radially inner anodized oxide layer 29 be connected. The first radially outer anodically generated oxide layer 27 does not have to with the first radially inner anodic oxide layer 29 be connected. An anodizing treatment for the first radially outer anodized oxide layer 27 is described in detail below.

As in 5 is the first radially inner anodic oxide layer 29 on the first non-braking surface 15b arranged. The first radially inner anodically generated oxide layer 29 is on the first non-braking surface 15b educated.

The first radially inner anodically generated oxide layer 29 is between the first braking surface 15a and the radially inner peripheral portion 13 in the radial direction with respect to the rotational center axis C1 arranged. For example, the first radially inner anodically produced oxide layer 29 between the first radially outer anodized oxide layer 27 and the radially inner peripheral portion 13 in the radial direction with respect to the rotational center axis C1 arranged.

The first radially inner anodically generated oxide layer 29 can with the first radially outer anodic oxide layer 27 be connected. The first radially inner anodically generated oxide layer 29 does not have to with the first radially outer anodic oxide layer 27 be connected.

The first radially inner anodically generated oxide layer 29 can with the second radially inner anodized oxide layer 33 over the radially inner peripheral portion 13 be connected. Specifically, the first radially inner anodically generated oxide layer 29 with the second radially inner anodically generated oxide layer 33 via the third anodically produced oxide layer 24 be connected. The anodizing treatment for the first radially inner anodized oxide layer 29 is described in detail below.

As in 5 is the second radially outer anodized oxide layer 31 on the second braking surface 19a arranged. The second radially outer anodically generated oxide layer 31 is on the second braking surface 19a educated.

The second radially outer anodically generated oxide layer 31 is between the radially outer peripheral portion 11 and the second non-braking surface 19b in the radial direction with respect to the rotational center axis C1 arranged. By way of example, the second radially outer anodically produced oxide layer is 31 between the radially outer peripheral portion 11 and the second radially inner anodized oxide layer 33 in the radial direction with respect to the rotational center axis C1 arranged.

The second radially outer anodically generated oxide layer 31 can with the second radially inner anodized oxide layer 33 be connected. The second radially outer anodically generated oxide layer 31 does not have to with the second radially inner anodic oxide layer 33 be connected. The anodization treatment for the second radially outer anodized oxide layer 31 is described in detail below.

As in 5 2 is the second radially inner anodized oxide layer 33 on the second non-braking surface 19b arranged. The second radially inner anodically generated oxide layer 33 is on the second non-braking surface 19b educated.

The second radially inner anodically generated oxide layer 33 is between the second braking surface 19a and the radially inner peripheral portion 13 in the radial direction with respect to the rotational center axis C1 arranged. By way of example, the second radially inner anodically produced oxide layer is 33 between the second radially outer anodic oxide layer 31 and the radially inner peripheral portion 13 in the radial direction with respect to the rotational center axis C1 arranged.

The second radially inner anodically generated oxide layer 33 can with the second radially outer anodized oxide layer 31 be connected. The second radially inner anodically generated oxide layer 33 does not have to with the second radially outer anodic oxide layer 31 be connected.

The second radially inner anodically generated oxide layer 33 can with the first radially inner anodized oxide layer 29 over the radially inner peripheral portion 13 be connected. Specifically, the second radially inner anodically generated oxide layer 33 with the first radially inner anodically generated oxide layer 29 via the third anodically produced oxide layer 24 be connected. The anodizing treatment for the second radially inner anodized oxide layer 33 is described in detail below.

As in 6 is shown, the anodizing treatment on the bicycle rim 107 carried out as follows. First, a degreasing treatment on the bicycle rim 107 carried out ( S21 ). For example, the degreasing treatment on at least the first side wall 15 (eg the first braking surface 15a and the first non-braking surface 15b) and the second side wall 19 (eg the second braking surface 19a and the second non-braking surface 19b) carried out.

Specifically, in the degreasing treatment, the bicycle rim 107 immersed in phosphate solution at 60 degrees Celsius for 10 minutes. As a result, for example, the degreasing treatment on the outer surfaces of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 , the first side wall 15 , the second side wall 19 and the connection section 23 carried out.

Second, the oxide-generating anodizing treatment becomes on the bicycle rim 107 carried out ( S22 ). For example, the oxide-generating anodizing treatment becomes on at least the first side wall 15 (eg the first braking surface 15a and the first non-braking surface 15b) and the second side wall 19 (eg the second braking surface 19a and the second non-braking surface 19b) carried out.

Specifically, in the oxide-generating anodizing treatment, the bicycle rim becomes 107 immersed in a solution containing 15% sulfuric acid under the conditions of temperature: 20 to 25 degrees Celsius, current density: 1.5 A / dm ² and electrolysis time: 30 minutes.

As a result, an alumite layer ( A1 ) on the outer surfaces of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 , the first side wall 15 , the second side wall 19 and the connection section 23 educated.

Third, a sealing treatment and a dyeing treatment on the bicycle rim 107 carried out ( S23 ). For example, the sealing and dyeing treatment on at least the alumite layer ( A1 ) carried out.

Specifically, in the sealing and dyeing treatment, the bicycle rim 107 immersed in a solution containing black water-soluble organic dye and nickel acetate. As a result, the Alumitschicht is sealed with the nickel acetate and z. B. dyed black.

Thereby, the sealing and coloring treatment on the outer surfaces of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 , the first side wall 15 , the second side wall 19 and the connection section 23 carried out.

Then, a cutting treatment is performed on the alumite layers on the first and second braking surfaces 15a . 19a ( S24 ) for forming at least a first groove 15c and at least one second groove 19c on the first braking surface 15a or the second braking surface 19a carried out. This turns the alumite layers ( A1 ) on the first and second braking surfaces 15a . 19a away. In the cutting treatment, a single spiral groove may be formed on the first and second braking surfaces 15a . 19a be formed. In addition, a surface roughening treatment may be performed on the first and second braking surfaces 15a . 19a with a device such as a blasting device or a laser processing device.

Then, the oxide-generating anodizing treatment on the bicycle rim becomes 107 carried out ( S25 ). For example, the oxide-generating anodizing treatment becomes on the first and second braking surfaces 15a . 19a carried out.

Specifically, in the oxide-generating anodizing treatment, the bicycle rim becomes 107 immersed in a solution containing 0.1% or more of sulfuric acid and 3% or more of organic acid under the conditions of temperature: 0 to 20 degrees Celsius, current density: 2.5 A / dm ² and electrolysis time: 30 minutes or more.

Thereby, the first and second radially outer anodically produced oxide layers become 27 . 31 and the third anodized oxide layer 24 , which are, for example, alumite layers ( A2 ) with natural color appearance, on the first and second braking surface 15a . 19a and the radially inner peripheral portion 13 educated.

Finally, a drying treatment on the bicycle rim 107 carried out ( S26 ). Specifically, in the drying treatment, the bicycle rim 107 contained in a drying oven at 100 degrees Celsius for 30 minutes.

By the above treatments, for example, the first and second radially outer anodized oxide layers are included 27 . 31 the alumite layers ( A2 ) with natural color appearance. The first and second radially inner anodically generated oxide layers 29 . 33 and the third anodized oxide layer 24 contain the alumite layers ( A1 ) with black color appearance.

In this embodiment, the third anodized oxide layer 24 contain the Alumitschichten with black color appearance. The alumite layer may be on the radially outer peripheral portion 11 and the connection section 23 be formed.

The first radially outer anodically generated oxide layer 27 differs from the first radially inner anodic oxide layer 29 , For example, the first radially outer anodically produced oxide layer 27 from the first radially inner anodic oxide layer 29 to distinguish at least one of layer thickness, emissivity, hardness and brightness (L *).

The first radially outer anodically generated oxide layer 27 has a first layer thickness. For example, the first layer thickness is equal to or greater than 30 microns and equal to or less than 100 microns. In this embodiment, the first layer thickness is, for example, 35 micrometers.

The first layer thickness is measured as follows. A sample of the first sidewall 15 gets out of the bicycle rim 107 cut. The cutting plane of the sample is polished after the sample has been embedded in resin.

In this state, the cutting plane of the sample is examined with a microscope. This measures the first layer thickness.

The first radially outer anodically generated oxide layer 27 has a first emissivity. For example, the first emissivity is less than 81%. For example, in this embodiment, the first emissivity is 81.6%.

The first emissivity is by the ratio of the light energy of the first radially outer anodic oxide layer 27 defines the light energy of a black body. The light energy of the first radially outer anodically produced oxide layer 27 is the one from the first radially outer anodic oxide layer 27 is released in the heat radiation. The light energy of the black body is that of the black body at the same temperature as that of the first radially outer anodized oxide layer 27 is released.

The first emissivity is measured based on JIS R 1693-2 as follows. The spectrum of the first radially outer anodically generated oxide layer 27 is measured by FTIR (Fourier Transform Infrared Spectroscopy). The first emissivity is measured at the predetermined temperature (eg, 20, 30, 50, and 70 degrees Celsius) based on the spectrum.

The first radially outer anodically generated oxide layer 27 has a first hardness. For example, the first hardness is equal to or greater than 300 Hv and equal to or less than 600 Hv. For example, in this embodiment, the first hardness is 500 Hv.

berechnet.The first hardness is measured as follows. The first hardness is defined by the Vickers hardness HV. The Vickers hardness HV is determined by the ratio F / A, where F is the force exerted on a pressure body in kiloponds and A is the surface of the first radially outer anodically generated oxide layer 27 in square millimeters. In other words, the Vickers hardness HV is given by the formula: $$\text{HV}=1.8544*\text{F}/\left(\text{d}*\text{d}\right)\text{or HV}=0.1891*\text{F}/\left(\text{d}*\text{d}\right)$$

calculated.

The first radially outer anodically generated oxide layer 27 has a first brightness (L *). For example, the first brightness (L *) is equal to or greater than 26.5 and equal to or less than 35. In this embodiment, the first hardness is 27.3, for example. In addition, the brightness (L *) is one of three color elements. The three elements include brightness (L *), saturation, and hue.

The first brightness (L *) is one of the color properties. The first brightness (L *) is one of the color properties. The first brightness (L *) indicates the degree of light and darkness.

The first brightness (L *) is measured as follows. Light from a light source strikes an outer surface of the first radially outer anodically-generated oxide layer 27 at 45 degrees. The reflected light from the outer surface of the first radially outer anodically generated oxide layer 27 at 0 ± 5 degrees is measured with a light receiver. The first brightness (L *) is measured based on the light measured with the light receiver.

The first radially inner anodically generated oxide layer 29 differs from the first radially outer anodic oxide layer 27 , For example, the first radially inner anodically produced oxide layer 29 from the first radially outer anodic oxide layer 27 to distinguish at least one of layer thickness, emissivity, hardness and brightness (L *).

The first radially inner anodically generated oxide layer 29 has a second layer thickness that is smaller than the first layer thickness. For example, the second layer thickness is equal to or greater than 2.5 microns and equal to or less than 10 microns. For example, in this embodiment, the second layer thickness is 10 micrometers.

The first radially inner anodically generated oxide layer 29 has a second emissivity greater than the first emissivity. For example, the second emissivity is equal to or greater than 81%. For example, in this embodiment, the second emissivity is 82%.

The first radially inner anodically generated oxide layer 29 has a second hardness that is less than the first hardness. For example, the second hardness is equal to or greater than 150 Hv and equal to or less than 250 Hv. For example, in this embodiment, the second hard is 200 Hv.

The first radially inner anodically generated oxide layer 29 has a second brightness (L *) that is less than the first brightness (L *). For example, the second brightness (L *) is equal to or greater than 20 and equal to or less than 26. In this embodiment, the second brightness (L *) is 25.5, for example.

The measurement with respect to the second layer thickness, the second emissivity, the second hardness, and the second brightness (L *) of the first radially inner anodic oxide layer 29 is the same as that for the first radially outer anodized oxide layer 27 , As a result, their description is omitted here.

The measuring mode for the second layer thickness, the second emissivity, the second hardness and the second brightness (L *) of the first radially inner anodically produced oxide layer 29 is the same as that for the first radially outer anodized oxide layer 27 , As a result, their description is omitted here.

Items for measuring the first and second emissivities, the first and second hardnesses, and the first and second brightnesses (L *) may be randomly selected from the bicycle rim 107 be selected samples.

The second radially outer anodically generated oxide layer 31 differs from the second radially inner anodic oxide layer 33 , For example, the second radially outer anodically produced oxide layer 31 from the second radially inner anodic oxide layer 33 to distinguish at least one of layer thickness, emissivity, hardness and brightness (L *).

The second radially outer anodically generated oxide layer 31 has a third layer thickness. For example, the third layer thickness is equal to or greater than 30 microns and equal to or less than 100 microns. For example, in this embodiment, the third layer thickness is 35 micrometers.

The second radially outer anodically generated oxide layer 31 has a third emissivity. For example, the third emissivity is less than 81%. For example, in this embodiment, the third emissivity is 80.6%.

The second radially outer anodically generated oxide layer 31 has a third hardness. For example, the third hardness is equal to or greater than 300 Hv and equal to or less than 600 Hv. For example, in this embodiment, the third hardness is 500 Hv.

The second radially outer anodically generated oxide layer 31 has a third brightness (L *). For example, the third brightness (L *) is equal to or greater than 26.5 and equal to or less than 35. In this embodiment, the third brightness (L *) is, for example, 27.3.

The third layer thickness, third emissivity, third hardness, and third brightness (L *) measurement of the second radially outer anodized oxide layer 31 is the same as that for the first radially outer anodized oxide layer 27 , As a result, their description is omitted here.

The second radially inner anodically generated oxide layer 33 differs from the second radially outer anodic oxide layer 31 , For example, the second radially inner anodically produced oxide layer 33 from the second radially outer anodized oxide layer 31 to distinguish at least one of layer thickness, emissivity, hardness and brightness (L *).

The second radially inner anodically generated oxide layer 33 has a fourth layer thickness that is smaller than the third layer thickness. For example, the fourth layer thickness is equal to or greater than 2.5 microns and equal to or less than 10 microns. For example, in this embodiment, the fourth layer thickness is 10 micrometers.

The second radially inner anodically generated oxide layer 33 has a fourth emissivity greater than the third emissivity. For example, the fourth emissivity is equal to or greater than 81%. For example, in this embodiment, the fourth emissivity is 82%.

The second radially inner anodically generated oxide layer 33 has a fourth hardness that is less than the third hardness. For example, the fourth hardness is equal to or greater than 150 Hv and equal to or less than 250 Hv. For example, in this embodiment, the fourth hardness is 200 Hv.

The second radially inner anodically generated oxide layer 33 has a fourth brightness (L *) that is less than the third brightness (L *). For example, the fourth brightness (L *) is equal to or greater than 20 and equal to or less than 26. In this embodiment, the fourth brightness (L *) is 25.5, for example.

The Fourth Layer Thickness, Fourth Emissivity, Fourth Hardness and Fourth Brightness (L *) of the second radially outer anodized oxide layer 31 is the same as that for the first radially outer anodized oxide layer 27 , As a result, their description is omitted here.

In addition, the third anodically produced oxide layer 24 have the same properties as the first and second radially inner anodic oxide layers 29 . 33 , Specifically, the third anodized oxide layer 24 have the same properties as at least one of the second and fourth layer thicknesses, the second and fourth emissivities, the second and fourth hardnesses, and the second and fourth brightnesses (L *).

Items for measuring the third and fourth emissivities, the third and fourth hardnesses, and the third and fourth brightnesses (L *) may be randomly removed from the bicycle rim 107 be selected samples.

As a variation of the second embodiment, the treatment of the bicycle rim 107 carried out as follows. The description of the same configuration as in the second embodiment is omitted here.

As in 7A is shown, first a degreasing treatment on the bicycle rim 107 carried out ( S21 ). Second, an oxide-forming anodizing treatment on the bicycle rim becomes 107 carried out ( S22 ). As a result, an alumite layer ( A3 ) on at least the first side wall 15 (eg the first braking surface 15a and the first non-braking surface 15b ) and the second side wall 19 (eg the second braking surface 19a and the second non-braking surface 19b ) educated.

Third, a dyeing treatment on the bicycle rim 107 carried out ( S23a ). This will cause the alumite layer ( A3 ) z. B. dyed black.

Then, a galvanizing-coating treatment is performed on the bicycle rim 107 performed (S24a). For example, the anion plating coating treatment becomes on at least the first sidewall 15 (eg the first braking surface 15a and the first non-braking surface 15b) and the second side wall 19 (eg the second braking surface 19a and the second non-braking surface 19b) carried out.

Specifically, in the anion plating-coating treatment, the bicycle rim becomes 107 immersed in a solution containing the acrylic resin under the conditions of voltage: 50-100 V, temperature: 10 to 30 degrees Celsius and electrolysis time: 1-5 minutes. As a result, a cover layer (C) is formed on the alumite layer.

Then a drying treatment on the bicycle rim 107 carried out ( S25a ). Then, a cutting treatment is performed on the first and second braking surfaces 15a . 19a for forming at least a first groove 15c and at least one second groove 19c on the first braking surface 15a or the second braking surface 19a carried out ( S26a ). This will cause the alumite layer ( A3 ) and the cover layer (C) of the first and second braking surfaces 15a . 19a away.

Then, an oxide-generating anodizing treatment such as the oxide-forming anodizing treatment ( S25 ) of the second embodiment, on the bicycle rim 107 carried out ( S27a ). For example, the oxide-generating anodizing treatment becomes on the first and second braking surfaces 15a . 19a carried out. This will cause the alumite layer ( A2 ) with natural color appearance on the first and second braking surface 15a . 19a educated. Finally, the drying treatment on the bicycle rim 107 carried out ( S28a ).

By the above treatments, for example, the first and second radially outer anodized oxide layers are included 27 . 31 the alumite layers ( A2 ) with natural color appearance. The first and second radially inner anodically generated oxide layers 29 . 33 contain the top layer (C) and the alumite layers ( A3 ) with black color appearance.

In this embodiment, the third anodized oxide layer 24 the cover layer (C) and the alumite layers ( A3 ) with black color appearance included. The cover layer (C) and the alumite layer ( A3 ) may be on at least one of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 and the connection section 23 be formed.

As another variation, for example, the following treatment may be performed after the cutting treatment (S26a). In this case, the following oxide-generating anodizing treatment on the bicycle rim becomes 107 ( S27b ) after the cutting treatment ( S26a ) carried out.

For example, as in 7B is shown in the oxide-forming anodizing treatment ( S27b ), the bicycle rim 107 immersed in a solution containing 5.0% -20% sulfuric acid under the conditions of temperature: 10 or less degrees Celsius, current density: 5-20 A / dm ² and electrolysis time: 30 minutes or more. This will result in a hard alumite layer ( A4 ) on the outer surfaces of the first and second braking surfaces 15a . 19a educated.

By the above treatments, for example, the first and second radially outer anodized oxide layers are included 27 . 31 the hard alumite layer ( A4 ). The first and second radially inner anodically generated oxide layers 29 . 33 contain the top layer (C) and the alumite layer ( A3 ) with black color appearance.

In this embodiment, the third anodized oxide layer 24 the cover layer (C) and the alumite layer ( A3 ) with black color appearance included. The cover layer (C) and the alumite layer ( C3 ) may be on at least one of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 and the connection section 23 be formed.

As another variation, for example, the following treatment may be performed after the cutting treatment (S26a). In this case, the following oxide-generating anodizing treatment on the bicycle rim becomes 107 ( S27c ) after the cutting treatment ( S26a ) carried out.

For example, as in 7C is shown in the oxide-forming anodizing treatment ( S27c ), the bicycle rim 107 immersed in a solution containing 5.0% -20% sulfuric acid under the conditions of temperature: 20 to 25 degrees Celsius, current density: 1-5 A / dm ² and electrolysis time: 30 minutes or more. As a result, an alumite layer ( A5 ) on the outer surfaces of the first and second brake surfaces 15a . 19a educated.

Then an electrolytic dyeing treatment on the bicycle rim 107 performed (S28c). For example, in the electrolytic Dyeing treatment, the bicycle rim 107 immersed in electrolytic solution containing 15-35 g / l of nickel sulfate, 20-40 g / l of boric acid and 10-20 g / l of ammonium sulfate under the conditions of AC electrolysis: 10 volts or more, treatment time: 2-15 minutes and bath temperature : 10 to 30 degrees Celsius. Finally, the drying treatment on the bicycle rim 107 carried out ( S29 ).

By the above treatments, for example, the first and second radially outer anodized oxide layers are included 27 . 31 the alumite layer ( A5 ) with black color appearance. The first and second radially inner anodically generated oxide layers 29 . 33 contain the top layer (C) and the alumite layer ( A3 ) with black color appearance.

In this embodiment, the third anodized oxide layer 24 the cover layer (C) and the alumite layer ( A3 ) with black color appearance included. The cover layer (C) and the alumite layer ( A1 ) may be on at least one of the radially outer peripheral portion 11 , the radially inner peripheral portion 13 and the connection section 23 be formed. Although the bicycle rim in the above embodiment is of the clincher type, the present invention can also be applied to a tubular rim of the tubular type, tubeless type or tubular clincher type.

In understanding the scope of the present disclosure, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of the specified features, elements, components, groups, integers, and / or steps, the presence of others but not preclude specified features, elements, components, groups, integers and / or steps.

The above also applies to words with similar meanings as the terms "containing", "with" and their derivatives. Also, the terms "part", "member", "section", "component" or "element", when used in the singular, may have the dual meaning of a single part or multiple parts.

Also, as used herein to describe the above embodiment (s), the following directional terms are "forward," "backward," "high," "down," "vertical," "horizontal," "under," and "across." as well as all other similar directional indications on those directions of the bicycle rim. Consequently, these terms as used to describe the present technology should be construed in relation to the bicycle rim.

The term "formed", as used herein to describe a component, member or part of a device, implies the existence of other unclaimed or unnamed components, members, components or parts of the device for performing a desired function. Terms of degree such as "substantially", "about" and "approximately" as used herein mean a reasonable amount of deviation from the modified term such that the end result does not change significantly.

Although only selected embodiments have been selected to illustrate the present technology, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made therein without departing from the scope of the technology as defined in the appended claims. For example, the size, shape, position or orientation of the various components may be changed as needed and / or desired.

Components shown as directly connected or contacting one another may have intermediate structures interposed therebetween. The functions of one element can be exercised by two, and vice versa. The structures and functions of one embodiment may be incorporated into another embodiment. In a particular embodiment, all advantages need not be present at the same time.

Any feature unique to the prior art, alone or in combination with other features, should also be considered as a separate description of other Applicants' technologies, including the structural and / or functional concepts provided by this feature (s). e) is / are embodied.

Thus, the foregoing descriptions of the embodiments according to the present technologies are merely illustrative and not restrictive of the technology as defined by the appended claims and their equivalents.

LIST OF REFERENCE NUMBERS

1

Bicycle wheel assembly

3

hub

5

Plurality of spokes

7

bicycle rim

9

tires

11

radially outer peripheral portion

11a

first radially outer peripheral portion

11b

second radially outer peripheral portion

13

radially inner peripheral portion

13a

Plurality of first openings

15

first sidewall

15a

first braking surface

15b

first non-braking surface

15c

first groove

17

first anodically produced oxide layer

19

second side wall

19a

second braking surface

19b

second non-braking surface

19c

second groove

21

second anodically produced oxide layer

23

connecting portion

23a

second opening / plurality of second openings

24

third anodically produced oxide layer

27

first radially outer anodically generated oxide layer

29

first radially inner anodically generated oxide layer

31

second radially outer anodically generated oxide layer

33

second radially inner anodically generated oxide layer

101

Bicycle wheel assembly

107

bicycle rim

C1

Central axis of rotation

gs

shine

L

predetermined area

Ra

roughness

Claims (63)

A bicycle rim (7) having a center of rotation (C1), said bicycle rim (7) comprising: a radially outer peripheral portion (11); a radially inner peripheral portion (13) disposed radially inwardly of the radially outer peripheral portion (11) with respect to the rotational center axis (C1); a first side wall (15) made of aluminum, the first side wall (15) extending between the radially outer peripheral portion (11) and the radially inner peripheral portion (13) and having a first braking surface (15a) and a first non-braking surface (15). 15b) disposed radially inwardly of the first braking surface (15a) with respect to the rotational center axis (C1); and a first anodized oxide layer (17) disposed on the first braking surface (15a) and the first non-braking surface (15b); in which the first anodized oxide layer (17) on the first braking surface (15a) has a first roughness Ra equal to or greater than 10 microns; and wherein the first anodized oxide layer (17) on the first non-braking surface (15b) has a first gloss Gs (60 degrees) equal to or greater than 5. Bicycle rim (7) according to Claim 1 , further comprising: a second side wall (19) made of aluminum and spaced from the first side wall (15) in an axis direction with respect to the rotation center axis (C1), the second side wall (19) being interposed between the radially outer peripheral portion (12). 11) and the radially inner peripheral portion (13), and a second braking surface (19a) and a second non-braking surface (19b) disposed radially inwardly of the second braking surface (19a) with respect to the rotational center axis (C1), contains; and a second anodized oxide layer (21) disposed on the second braking surface (19a) and the second non-braking surface (19b), the second anodized oxide layer (21) on the second braking surface (19a) having a second roughness Ra which is equal to or greater than 10 microns; and wherein the second anodized oxide layer (21) has a second gloss Gs (60 degrees) on the second non-braking surface (19b) equal to or greater than 5. Bicycle rim (7) according to Claim 1 or 2 wherein the first roughness Ra is equal to or greater than 15 microns. Bicycle rim (7) according to one of Claims 1 to 3 wherein the first gloss Gs (60 degrees) is equal to or greater than 20. Bicycle rim (7) according to Claim 2 wherein the second roughness Ra is equal to or greater than 15 microns. Bicycle rim (7) according to Claim 2 or 5 wherein the second gloss Gs (60 degrees) is equal to or greater than 20. Bicycle rim (7) according to one of Claims 2 . 5 and 6 wherein the first anodized oxide layer (17) and the second anodized oxide layer (21) are connected to each other via the radially inner peripheral portion (13). Bicycle rim (7) according to one of Claims 1 to 7 wherein at least one first groove (15c) is formed on the first braking surface (15a). Bicycle rim (7) according to Claim 8 wherein the at least one first groove (15c) is a single spiral groove. Bicycle rim (7) according to one of Claims 2 . 5 . 6 and 7 wherein at least one second groove (19c) is formed on the second braking surface (19a). Bicycle rim according to Claim 10 wherein the at least one second groove (19c) is a single spiral groove. A bicycle rim (107) having a rotational centerline (C1), said bicycle rim (107) comprising: a radially outer peripheral portion (11); a radially inner peripheral portion (13) disposed radially inwardly of the radially outer peripheral portion (11) with respect to the rotational center axis (C1); a first side wall (15) made of aluminum, the first side wall (15) extending between the radially outer peripheral portion (11) and the radially inner peripheral portion (13) and having a first braking surface (15a) and a first non-braking surface (15). 15b) disposed radially inwardly of the first braking surface (15a) with respect to the rotational center axis (C1); a first radially outer anodized oxide layer (29) disposed on the first braking surface (15a) and having a first layer thickness; and a first radially inner anodized oxide layer (29) disposed on the first non-braking surface (15b) and having a second layer thickness smaller than the first layer thickness. Bicycle rim (107) according to Claim 12 wherein the first layer thickness is equal to or greater than 30 microns and equal to or less than 100 microns. Bicycle rim (107) according to Claim 12 or 13 wherein the second layer thickness is equal to or greater than 2.5 microns and equal to or less than 10 microns. Bicycle wheel (107) according to one of Claims 12 to 14 , further comprising: a second side wall (19) made of aluminum and spaced from the first side wall (15) in an axis direction with respect to the rotation center axis (C1), the second side wall (19) being interposed between the radially outer peripheral portion (12). 11) and the radially inner peripheral portion (13), and a second braking surface (19a) and a second non-braking surface (19b) disposed radially inwardly of the second braking surface (19a) with respect to the rotational center axis (C1), contains; a second radially outer anodized oxide layer (31) disposed on the second braking surface (15a) and having a third layer thickness; and a second radially inner anodized oxide layer (33) disposed on the second non-braking surface (15b) and having a fourth layer thickness smaller than the third layer thickness. Bicycle rim (107) according to Claim 15 wherein the third layer thickness is equal to or greater than 30 microns and equal to or less than 100 microns. Bicycle rim (107) according to Claim 15 or 16 wherein the fourth layer thickness is equal to or greater than 2.5 microns and equal to or less than 10 microns. Bicycle wheel (107) according to one of Claims 12 to 17 wherein the first radially outer anodized oxide layer (27) differs from the first radially inner anodized oxide layer (29). Bicycle wheel (107) according to one of Claims 15 to 17 wherein the second radially outer anodized oxide layer (31) differs from the second radially inner anodized oxide layer (33). Bicycle rim (107) according to Claim 15 wherein the first radially outer anodized oxide layer (27) differs from the first radially inner anodized oxide layer (29); and the second radially outer anodized oxide layer (31) differs from the second radially inner anodized oxide layer (33). Bicycle wheel (107) according to one of Claims 12 to 20 wherein at least one first groove (15c) is formed on the first braking surface (15a). Bicycle rim (107) according to Claim 21 wherein the at least one first groove (15c) is a single spiral groove. Bicycle wheel (107) according to one of Claims 15 . 16 . 17 and 19 wherein at least one second groove (19c) is formed on the second braking surface (19a). Bicycle rim (107) according to Claim 23 wherein the at least one second groove (19c) is a single spiral groove. A bicycle rim (107) having a rotational center axis (C1), said bicycle rim (107) comprising: a radially outer peripheral portion (11); a radially inner peripheral portion (13) disposed radially inwardly of the radially outer peripheral portion (11) with respect to the rotational center axis (C1); a first side wall (15) made of aluminum, the first side wall (15) extending between the radially outer peripheral portion (11) and the radially inner peripheral portion (13) and having a first braking surface (15a) and a first non-braking surface (15). 15b) disposed radially inwardly of the first braking surface (15a) with respect to the rotational center axis (C1); a first radially outer anodized oxide layer (27) disposed on the first braking surface (15a) and having a first emissivity; and a first radially inner anodized oxide layer (29) disposed on the first non-braking surface (15b) and having a second emissivity greater than the first emissivity. Bicycle rim (107) according to Claim 25 , where the first emissivity is less than 81%. Bicycle rim (107) according to Claim 25 or 26 , wherein the second emissivity is equal to or greater than 81%. Bicycle wheel (107) according to one of Claims 25 to 27 , further comprising: a second side wall (19) made of aluminum and spaced from the first side wall (15) in an axis direction with respect to the rotation center axis (C1), the second side wall (19) being interposed between the radially outer peripheral portion (12). 11) and the radially inner peripheral portion (13), and a second braking surface (19a) and a second non-braking surface (19b) disposed radially inwardly of the second braking surface (19a) with respect to the rotational center axis (C1), contains; a second radially outer anodized oxide layer (31) disposed on the second braking surface (19a) and having a third emissivity; and a second radially inner anodized oxide layer (33) disposed on the second non-braking surface (19b) and having a fourth emissivity greater than the third emissivity. Bicycle rim (107) according to Claim 28 , where the third emissivity is less than 81%. Bicycle rim (107) according to Claim 28 or 29 , wherein the fourth emissivity is equal to or greater than 81%. Bicycle wheel (107) according to one of Claims 25 to 30 wherein the first radially outer anodized oxide layer (27) differs from the first radially inner anodized oxide layer (29). Bicycle wheel (107) according to one of Claims 28 to 30 wherein the second radially outer anodized oxide layer (31) differs from the second radially inner anodized oxide layer (33). Bicycle rim (107) according to Claim 28 wherein the first radially outer anodized oxide layer (27) differs from the first radially inner anodized oxide layer (29); and the second radially outer anodized oxide layer (31) differs from the second radially inner anodized oxide layer (33). Bicycle wheel (107) according to one of Claims 25 to 33 wherein at least one first groove (15c) is formed on the first braking surface. Bicycle rim (107) according to Claim 34 wherein the at least one first groove (15c) is a single spiral groove. Bicycle wheel (107) according to one of Claims 28 . 29 . 30 and 32 wherein at least one second groove (19c) is formed on the second braking surface (19a). Bicycle rim (107) according to Claim 36 wherein the at least one second groove (19c) is a single spiral groove. A bicycle rim (107) having a rotational centerline (C1), said bicycle rim (107) comprising: a radially outer peripheral portion (11); a radially inner peripheral portion (13) disposed radially inwardly of the radially outer peripheral portion (11) with respect to the rotational center axis (C1); a first side wall (15) made of aluminum, the first side wall (15) extending between the radially outer peripheral portion (11) and the radially inner peripheral portion (13) and having a first braking surface (15a) and a first non-braking surface (15). 15b) disposed radially inwardly of the first braking surface (15a) with respect to the rotational center axis (C1); a first radially outer anodized oxide layer (27) disposed on the first braking surface (15a) and having a first hardness; and a first radially inner anodized oxide layer (29) disposed on the first non-braking surface (15b) and having a second hardness smaller than the first hardness. Bicycle rim (107) according to Claim 38 wherein the first hardness is equal to or greater than 300 Hv and equal to or less than 600 Hv. Bicycle rim (107) according to Claim 38 or 39 wherein the second hardness is equal to or greater than 150 Hv and equal to or less than 250 Hv. Bicycle wheel (107) according to one of Claims 38 to 40 , further comprising: a second side wall (19) made of aluminum and spaced from the first side wall (15) in an axis direction with respect to the rotation center axis (C1), the second side wall (19) being interposed between the radially outer peripheral portion (12). 11) and the radially inner peripheral portion (13), and a second braking surface (19a) and a second non-braking surface (19b) disposed radially inwardly of the second braking surface (19a) with respect to the rotational center axis (C1), contains; a second radially outer anodized oxide layer (31) disposed on the second braking surface (19a) and having a third hardness; and a second radially inner anodized oxide layer (33) disposed on the second non-braking surface (19b) and having a fourth hardness smaller than the third hardness. Bicycle rim (107) according to Claim 41 wherein the third hardness is equal to or greater than 300 Hv and equal to or less than 600 Hv. Bicycle rim (107) according to Claim 41 or 42 wherein the fourth hardness is equal to or greater than 150 Hv and equal to or less than 250 Hv. Bicycle wheel (107) according to one of Claims 38 to 43 wherein the first radially outer anodized oxide layer (17) differs from the first radially inner anodized oxide layer (29). Bicycle wheel (107) according to one of Claims 41 to 43 wherein the second radially outer anodized oxide layer (31) differs from the second radially inner anodized oxide layer (33). Bicycle rim (107) according to Claim 41 wherein the first radially outer anodized oxide layer (17) differs from the first radially inner anodized oxide layer (29); and the second radially outer anodized oxide layer (31) differs from the second radially inner anodized oxide layer (33). Bicycle wheel (107) according to one of Claims 38 to 46 wherein at least one first groove (15c) is formed on the first braking surface (15a). Bicycle rim (107) according to Claim 47 wherein the at least one first groove (15a) is a single spiral groove. Bicycle wheel (107) according to one of Claims 41 . 42 . 43 and 45 wherein at least one second groove (19c) is formed on the second braking surface (19a). Bicycle rim (107) according to Claim 49 wherein the at least one second groove (19c) is a single spiral groove. A bicycle rim (107) having a rotational centerline (C1), said bicycle rim (107) comprising: a radially outer peripheral portion (11); a radially inner peripheral portion (13) disposed radially inwardly of the radially outer peripheral portion (11) with respect to the rotational center axis (C1); a first side wall (15) made of aluminum, the first side wall (15) extending between the radially outer peripheral portion (11) and the radially inner peripheral portion (13) and having a first braking surface (15a) and a first non-braking surface (15). 15b) disposed radially inwardly of the first braking surface (15a) with respect to the rotational center axis (C1); a first radially outer anodized oxide layer (27) disposed on the first braking surface (15a) and having a first brightness (L *); and a first radially inner anodized oxide layer (29) disposed on the first non-braking surface (15b) and having a second brightness (L *) smaller than the first brightness (L *). Bicycle rim (107) according to Claim 51 wherein the first brightness (L *) is equal to or greater than 26.5 and equal to or less than 35. Bicycle rim (107) according to Claim 51 or 52 wherein the second brightness (L *) is equal to or greater than 20 and equal to or less than 26. Bicycle wheel (107) according to one of Claims 51 to 53 , further comprising: a second side wall (19) made of aluminum and spaced from the first side wall (15) in an axis direction with respect to the rotation center axis (C1), the second side wall (19) being interposed between the radially outer peripheral portion (12). 11) and the radially inner peripheral portion (13), and a second braking surface (19a) and a second non-braking surface (19b) disposed radially inwardly of the second braking surface (19a) with respect to the rotational center axis (C1), contains; a second radially outer anodized oxide layer (31) disposed on the second braking surface (19a) and having a third brightness (L *); and a second radially inner anodized oxide layer (33) disposed on the second non-braking surface (19b) and having a fourth brightness (L *) smaller than the third brightness (L *). Bicycle rim (107) according to Claim 54 wherein the third brightness (L *) is equal to or greater than 26.5 and equal to or less than 35. Bicycle rim (107) according to Claim 54 or 55 wherein the fourth brightness (L *) is equal to or greater than 20 and equal to or less than 26. Bicycle wheel (107) according to one of Claims 51 to 56 wherein the first radially outer anodized oxide layer (17) differs from the first radially inner anodized oxide layer (29). Bicycle wheel (107) according to one of Claims 54 to 56 wherein the second radially outer anodized oxide layer (31) differs from the second radially inner anodized oxide layer (33). Bicycle rim (107) according to Claim 54 wherein the first radially outer anodized oxide layer (27) differs from the first radially inner anodized oxide layer (29); and the second radially outer anodized oxide layer (31) differs from the second radially inner anodized oxide layer (33). Bicycle wheel (107) according to one of Claims 51 to 59 wherein at least one first groove (15c) is formed on the first braking surface (15a). Bicycle rim (107) according to Claim 60 wherein the at least one first groove (15a) is a single spiral groove. Bicycle wheel (107) according to one of Claims 54 . 55 . 56 and 58 wherein at least one second groove (19c) is formed on the second braking surface (19a). Bicycle rim (107) according to Claim 62 wherein the at least one second groove (19c) is a single spiral groove.

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