Ōsaka, Japan
Ōsaka, Japan

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Patent
Tamagawa Seiki Kabushiki Kaisha, KASATANI Corporation and Nissin Kogyo Co. | Date: 2014-12-30

A primary molded body having an angled connector that is integrally connected to an insulating annular body provided in a stator of a motor section, and that has a plurality of terminals extending along an axial direction of the motor section; a through-hole that is formed in the primary molded body and runs through the angled connector from an interior of the insulating annular body; a secondary molded body that is molded so as to cover the primary molded body; a secondary molded connector that is formed in the secondary molded body and covers the angled connector; and a connector opening that is formed in the secondary molded connector and communicates with the through-hole, wherein an outlet of the through-hole communicates with the connector opening.


Ohara M.,Kasatani Corporation | Takigawa Y.,Osaka Prefecture University | Higashi K.,Osaka Prefecture University
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals | Year: 2010

To develop an improved surface treatment for producing metallic luster on magnesium alloys by controlling surface roughness, we analyzed the angle of incidence Ψ, the instrument acceptance angle △θ and the root mean square slope m, for experimental results on specular glossiness Gs and root mean square roughness a. First, we derived a theoretical equation from the theory of electromagnetic waves and a model of surface roughness, assuming that the root mean square roughness is much smaller than the wavelength of the incident radiation. In this equation, the ratio R/R0 of the specular reflectance of the specimens to the specular reflectance of a smooth surface indicates the sum of the specular reflection component and the scattering reflection component for the instrument acceptance angle. This reflectance is a function of the angle of incidence. In this study, angles of incidence of 20°, 60° and 85° were used. Next, the specular glossiness and the root mean square roughness were measured for the surface of AZ31 magnesium alloy specimens treated with acidic aqueous solution. The value of the root mean square slope was obtained from the theoretical equation and was compared with the experimental results. We found that the experimental results matched the results calculated for an angle of incidence of 20°. These results clarified that the reflectance R/Ro is a function of α/λ, the angle of incidence w, the instrument acceptance angle △θ and the root mean square slope m. These results will be useful for developing better surface treatments for producing metallic luster on magnesium alloys. © 2010 The Japan Institute of Metals.


Ohara M.,Kasatani Corporation | Higashi K.,Osaka Prefecture University
Materials Transactions | Year: 2011

To form a metallic luster on AZ31 magnesium alloy, it is necessary to optimize the surface morphology since the surface roughness affects the specular reflection of visible light, and the surface structure such as the film thickness and properties must be optimized so that light is not absorbed. We conducted experiments to analyze the relationship between surface roughness and specular reflection, and determined the range required to produce metallic luster. The ratio of the root mean square roughness a to the wavelength of incident light λ was 0-0.067, and the ratio of the specular reflectivity R of the specimens to the specular reflectivity of a smooth surface R 0 was 0.54-1.0. The thickness of film to form a metallic luster was theoretically analyzed and found to be about 100 nm or less. The authors developed an optimum acid aqueous solution for treating the surface to form a metallic luster on the surface of AZ31 magnesium alloy. This treatment satisfied the range required to form a metallic luster identified theoretically, and formed a film with a stable structure that maintained its metallic luster. The treatment maintained the geometrical patterns such as the hair-line and blast finishing of several hundred nm or more. A sufficiently high-quality surface for exterior parts was obtained by improving the process, and the process was industrialized. © 2011 The Japan Institute of Metals.


Ohara M.,Kasatani Corporation | Takigawa Y.,Osaka Prefecture University | Higashi K.,Osaka Prefecture University
Keikinzoku/Journal of Japan Institute of Light Metals | Year: 2010

In order to clarify the relationship between the surface roughness and the metallic luster and the relationship between the surface roughness and the conditions of the surface treatment, the surface roughness was examined in AZ31 magnesium alloy. The standard state of the metallic luster was the surface polished by emery paper #2000. The surface roughness and the metallic luster were quantified by the root mean square roughness, σ, with a cutt-off value of 0.002 mm and the specular gloss. It was analyzed the relationship between the metallic luster and the surface roughness. For the result, the metallic luster was available that the surface roughness was formed in the range of 0<σ/λ<0.1, and the necessary value of σ for the realization of the metallic luster was less than 53 nm. The optimal acid aqueous solution treatment was available the metallic luster, and σ was 9 nm. Finally, σ with the surface treatment conditions in the both component included the oxidant and high temperature and in the oxidant-free both components was examined, and was about 8Q nm. Therefore, it was concluded that the metallic luster was unavailable.


Ohara M.,Kasatani Corporation | Takigawa Y.,Osaka Prefecture University | Higashi K.,Osaka Prefecture University
Keikinzoku/Journal of Japan Institute of Light Metals | Year: 2010

In order to impart metallic luster to AZ31 magnesium alloy, the conditions of surface treatment were optimized, and the formative mechanism of metallic luster on the surface was inferred from the results of surface analysis. The target of this study was the surface of AZ31 magnesium alloy that was polished by emery paper (#2000). When the optimal acid aqueous solution treatment was applied, more than 60% of the magnesium in the film was oxidized. In addition, the thickness of the film was about 55 nm. It was confirmed that hydrogen generation was inhibited under the optimized surface treatment conditions. This optimization was performed by examining oxidant addition and the temperature of the acid aqueous solution, and metallic luster was successfully imparted to the alloy. In the optimal acid aqueous solution treatment, it was found that the reaction rate of magnesium oxide formation was faster than that of the dissolution of magnesium from the film composed of magnesium oxide on the surface. For surface treatment conditions in which a dull surface was obtained, it is speculated that the surface became rough due to the generation of hydrogen.

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