Jtekt Corporation

Yoshinobu Muramoto

Yuichi Toyama

Tomohiro Niwa

Hiroyuki Takahashi

Takaya Tanikawa

Fumihiro Kawakami

Kosuke Tsukahara

Naoki Kinouchi

A wave washer is used for a shaft supporting device of an electric power steering system. The wave washer has an annular portion and six outward protrusions. The annular portion has first protrusions that protrude in a first axial direction and second protrusions that are formed so as to continuous with the first protrusions and that protrude in a second axial direction. Each outward protrusion protrudes from an outer periphery of the annular portion in a radially outward direction of the radial direction of the annular portion.

Wave washer, rotary shaft supporting device including the wave washer, and electric motor including the rotary shaft supporting device

In a motor that includes bus bars each of which has an intermediate electrical path portion, end electrical path portions, and a main electrical path portion, the width of a portion of the intermediate electrical path portion at which the multiple end electrical path portions are formed between the main electrical path portion and an end portion of the intermediate electrical path portion is decreased from the portion at which the main electrical path portion is formed toward the end portion of the intermediate electrical path portion in such a manner that the width is decreased immediately after each intervening end electrical path portion by a unit width 'w' that is equal to the width of the end electrical path portion. Thus, it is possible to prevent the current density in the intermediate electrical path portion from being excessive so that the current density is maintained substantially constant, and to attain lighter bus bars, and, consequently, to attain a lighter motor.

Polyphase alternating-current motor and electric power steering apparatus

Growing community of inventors

Toyoake, Japan

Yoshinobu Muramoto