Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2017/208711
Kind Code:
A1
Abstract:
In order to provide an electric tool that can effectively reduce the backflow of cooling air toward a motor body, an electric drill 1 has a housing 2 in which an exhaust port 25 is formed, a motor 3 stored in the housing 2, a fan 4 that rotates with rotation of a rotary shaft 31 of the motor 3, and a fan guide 5. The fan 4 is stored in a fan storing part 27 of the housing 2. The fan guide 5 has a base part 51 facing the outer peripheral part of blades 42 of the fan 4, and a cover part 54 having an annular shape and facing the surface of the fan 4 on the side of a stator 32 of the motor 3 in the axial direction of the rotary shaft 31. The cover part 54 has a first cover part 54A, and a second cover part 54B having a greater radial length than the first cover part 54A. The first cover part 54A is provided on the radially inner side of a region R1, where the exhaust port 25 is formed, on a peripheral wall surface 27B that defines the fan storing part 27, and the second cover part 54B is provided on the radially inner side of a region R2, where the exhaust port 25 is not formed, on the peripheral wall surface 27B.

Inventors:
TOMIYAMA Takeru (1060, Taked, Hitachinaka-City Ibaraki 02, 〒3128502, JP)
MATSUSHITA Akira (1060, Taked, Hitachinaka-City Ibaraki 02, 〒3128502, JP)
Application Number:
JP2017/016970
Publication Date:
December 07, 2017
Filing Date:
April 28, 2017
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HITACHI KOKI CO., LTD. (15-1, Konan 2-chome Minato-k, Tokyo 20, 〒1086020, JP)
International Classes:
B25F5/02; B25F5/00
Download PDF: