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Patent Searching and Data


Title:
ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2020/003696
Kind Code:
A1
Abstract:
An electric tool is provided which enables preventing adherence to the rotor core of dust, such as iron powder, that has entered into the motor. This electric tool comprises a cylindrical motor housing 10 housing and supporting a motor, and a cooling fan attached to the rotation shaft of the motor, and cools the motor by passing air generated by the cooling fan towards the back or front of the motor housing 10, wherein a fan guide 54 for guiding cooling air is provided in front of an insulator 35 of the stator 30 in the motor. The fan guide 50 comprises a first cylindrical part 51 which covers the rotation space of the cooling fan, a guide surface 53, and a second cylinder 55 which extends backwards from the guide surface 53, wherein a labyrinth space 39 is formed by the insulator 53 and the second cylinder 55. By providing the labyrinth space 39, it is possible to block the flow of cooling air from the outer peripheral side of the stator 3 to the opening 53a.

Inventors:
MIYAZAWA KEN (JP)
SUZUKI RYO (JP)
Application Number:
PCT/JP2019/015940
Publication Date:
January 02, 2020
Filing Date:
April 12, 2019
Export Citation:
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Assignee:
KOKI HOLDINGS CO LTD (JP)
International Classes:
B24B23/00; B25F5/00
Domestic Patent References:
WO2017150030A12017-09-08
Foreign References:
JP2013031901A2013-02-14
JP2015123515A2015-07-06
JPS4729684U1972-12-04
CN205237765U2016-05-18
US20100170538A12010-07-08
JP2012061552A2012-03-29
Other References:
See also references of EP 3815848A4
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