Title:
POWER TOOL
Document Type and Number:
WIPO Patent Application WO/2021/220993
Kind Code:
A1
Abstract:
The present invention cools a bearing. In a vibration drill 10, a rear-side motor bearing 45 that rotatably supports a rotating shaft 41 of a motor 40 is held in a bearing holding part 26 of a motor housing 24. A plurality of air suction holes 26D are formed so as to penetrate the bearing holding part 26, and the interior and the exterior of the motor housing 24 communicate via the air suction holes 26D. Further, part of the rear-side motor bearing 45 is exposed to an air inlet channel 26E side of the interior of the air suction holes 26D. Due to this configuration, the rear-side motor bearing 45 can be cooled by an air flow AR1 that flows into the motor housing 24 from the air suction holes 26D.
Inventors:
NAKANO RYOSUKE (JP)
YOKOYAMA YOSHIKAZU (JP)
INUI KEN (JP)
SO CHISHO (JP)
YOKOYAMA YOSHIKAZU (JP)
INUI KEN (JP)
SO CHISHO (JP)
Application Number:
PCT/JP2021/016541
Publication Date:
November 04, 2021
Filing Date:
April 23, 2021
Export Citation:
Assignee:
KOKI HOLDINGS CO LTD (JP)
International Classes:
B25F5/00; B23B45/16; B23B47/00; B23Q11/12
Domestic Patent References:
| WO2018179587A1 | 2018-10-04 | |||
| WO2016076143A1 | 2016-05-19 |
Foreign References:
| JPS6015419Y2 | 1985-05-15 | |||
| JPS4859941U | 1973-07-30 | |||
| JP2019038093A | 2019-03-14 | |||
| JP2002101614A | 2002-04-05 | |||
| JP2002321172A | 2002-11-05 | |||
| JP2006167843A | 2006-06-29 | |||
| US7308950B2 | 2007-12-18 | |||
| JPS5790925U | 1982-06-04 |
Download PDF:
Previous Patent: WORK MACHINE
Next Patent: POWER STORAGE CELL, POWER STORAGE DEVICE, AND METHOD FOR MANUFACTURING POWER STORAGE DEVICE
Next Patent: POWER STORAGE CELL, POWER STORAGE DEVICE, AND METHOD FOR MANUFACTURING POWER STORAGE DEVICE