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1. (WO2018003369) ELECTRICALLY POWERED TOOL

Pub. No.:    WO/2018/003369    International Application No.:    PCT/JP2017/019711
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Sat May 27 01:59:59 CEST 2017
IPC: B25F 5/02
B24B 23/02
B25F 5/00
Applicants: KOKI HOLDINGS CO., LTD.
工機ホールディングス株式会社
Inventors: MIYAZAWA Ken
宮澤 健
SAKAI Hironori
坂井 裕紀
Title: ELECTRICALLY POWERED TOOL
Abstract:
Provided is an electrically powered tool wherein a switching element and a capacitor, which are used to drive a brushless motor, are effectively arranged, and wherein the effect of cooling the switching element and the capacitor is improved. Provided is an electrically powered tool configured so that a handle section 160 is rotatable relative to a body section 102, wherein a motor housing 200 is formed in a cylindrical integral structure, and a first drive circuit 241 on which a switching element is mounted is received from a rear opening. The first drive circuit 241 is disposed within a circular cylindrical case 231 open to the rear side. A handle housing 161 is provided with an air flow window 165, and a gear case 104 is provided with a discharge opening. When a cooling fan 106 rotates, air is sucked into the handle housing from the air flow window 165. Then, as indicated by the arrow, the air cools, within the motor housing 200, the switching element mounted on the first derive circuit 241, then cools the motor 105, and is discharged to the outside from the discharge opening.