Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shinichi Sakamoto0
Atsushi Nakagawa0
Kazutaka Iwata0
Kenichirou Yoshida0
Tomomasa Nishikawa0
Tomoyoshi Yokota0
Date of Patent
February 12, 2008
0Patent Application Number
114063730
Date Filed
April 19, 2006
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A power tool includes a brushless motor, a cooling fan, and a driving unit in a housing. The brushless motor is provided in the housing and having a rotary shaft. The cooling fan is attached to the rotary shaft in the housing, and rotatable together with the rotary shaft. The driving unit is provided in the housing for driving the motor. The driving unit includes an inverter circuit having a circuit board and a plurality of switching elements mounted on the circuit board. The circuit board is positioned on an opposite side to the motor with respect to the cooling fan. The plurality of switching elements is positioned around the cooling fan in a circumferential direction about the rotary shaft.
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