Ogura Clutch Company, Ltd.

Aisin Seiki Kabushiki Kaisha

Hiroyasu Onai

Ryoichi Fukumoto

Tomoaki Nishimura

Tsutomu Takeuchi

Yoshihiro Kurosu

Takashi Yamaguchi

Motoi Kato

Keita Nakashima

Yasuo Kidena

Takeshi Maeda

Kosuke Murakami

An excitation operation brake includes a braking shaft, an armature that rotates integrally with the braking shaft, and a field core including a disc portion facing the armature. The disc portion includes an outer magnetic shielding portion and an inner magnetic shielding portion, which make a magnetic flux flowing through the disc portion bypass to the armature a plurality of times. The outer magnetic shielding portion includes a low-magnetic resistance path having a magnetic resistance smaller than the magnetic resistance of a magnetic path that bypasses to the armature.

Excitation operation brake

A drive device is provided with a housingand an electromagnetic clutch mechanismaccommodated in the housing. The electromagnetic clutch mechanismis provided with an armaturerotatably supported in the housing, a rotorarranged to face the armatureand rotatably supported in the housing, and a coil. An annular magnetis fixed on the outer circumference surface of the rotor. A sensorarranged inside the housingdetects a polarity change of the magnetin association with rotation of the rotor. The magnetis provided with an annular wall portionextending toward the armaturebeyond a surface on which the armatureis in contact with the rotorwith respect to the axial direction. The annular wall portionis spaced radially outward from the armature. The annular wall portionprevents abrasion powder produced on actuation of the electromagnetic clutch mechanismfrom being scattered.

Drive device

Growing community of inventors

Isesaki, Japan

Hiroyasu Onai