Nidec Corporation

Naoto Yamaoka

Takamasa Yamashita

Takaya Otsuki

Kazuhiro Inouchi

Yuji Yabuuchi

Masahiro Ishikawa

Makoto Fujihara

A heat sink has a plurality of radially extending radiating fins, which are arranged annularly on the outer circumferential surface of a cylindrical base to be integral with that surface. The base is formed to have a cylindrical shape having a center axis. The base is formed to be solid-core. The heat sink is ground such that a cooling object contact portion having a generally cylindrical shape projects from the end surface of the heat sink in the axial direction. An annular groove is ground out along the outer circumference of a contact surface of the cooling object contact portion. An attaching member is attached on the outer circumferential surface of the cooling object contact portion, and a pressure application portion is entirely pressed by a pressing machine. The pressure application portion is plastically deformed outward in the diameter direction, so that the attaching member is fixed in between.

Radiator, heat sink fan, and radiator manufacturing method

A heat dissipating device which dissipates heat generated by a heat generating object mounted on a base includes a heat sink body, a heat-conducting area, a tip portion, an inclined surface, and a fastener. The heat-conducting area includes the tip portion, which is a substantially middle portion of the heat-conducting area and is arranged substantially closest to the heat generating object among the other areas of the heat-conducting area, and the inclined surface which is a part of the heat-conducting area and inclines outwardly from the tip portion such that a distance between the inclined surface and the heat generating object gradually increases. The fastener includes an attaching portion to mount the heat dissipating device to the base, and the attaching portion is arranged substantially radially outside of an outer peripheral portion of the heat generating object. When the attaching portion is secured to the base, the tip portion of the heat-conducting area is pressed to the heat generating object.

Heat dissipating device

A motor includes a rotor and a stator. A shaft of the rotor is received in a sleeve. A face of the sleeve and a face of the shaft, that are opposed to each other, form a bearing supporting the rotor in a rotatable manner relative to the stator. A sleeve-retaining portion that retains the sleeve has a bottom portion opposed to an axial end of the sleeve. A magnet holder is arranged in the bottom portion to accommodate an attracting magnet magnetically attracting the axial end of the shaft. The magnet holder is held between the axial end of the sleeve and the bottom portion of the sleeve-retaining portion.

Motor

Heat sink fan

Growing community of inventors

Kyoto, Japan

Naoto Yamaoka