Title:
電動工具
Document Type and Number:
Japanese Patent JP7031684
Kind Code:
B2
Abstract:
The present invention provides an electrical power tool which is capable of preventing adhesion of powder dust, such as iron powder, to edges of a stator core. Provided is an electrical power tool that includes: a motor having a rotor core 71 using a permanent magnet mounted to a rotary shaft 60; a cooling fan 13; and a motor housing for accommodating the motor and the cooling fan, wherein outside air is taken in by means of the cooling fan 13 so as to cause cooling air to flow in the direction of the rotary shaft 60 within the motor housing. Non-magnetic metal balancer members 85, 95 formed in a cylindrical shape having an outer diameter smaller than that of the rotor core 71 are provided on both ends, of the rotor core 71, in the axial direction. Further, resin spacer members 80, 90 are provided between the rotor core 71 and the balancer members 85, 95. The rotor core 71 has formed on the outer circumferential surface 71c thereof a plurality of axially-oriented grooves 74a-74d of a substantially V-shaped, while the spacer members 80, 90 are also configured to have substantially the same profile as the rotor core 71 so as to be able to cover a metal portion of the end faces 71a, 71b of the rotor core 71.
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Inventors:
Ken Miyazawa
Application Number:
JP2019557031A
Publication Date:
March 08, 2022
Filing Date:
September 28, 2018
Export Citation:
Assignee:
Koki Holdings Co., Ltd.
International Classes:
B24B23/00; H02K7/04; B24B23/02; B25F5/00; H02K7/14; H02K9/06
Domestic Patent References:
| JP2015126562A | ||||
| JP2013031901A | ||||
| JP2003274587A |
Attorney, Agent or Firm:
Aoritsu patent business corporation