Power tool

Patent metadata

Field	Value
Publication number	US-11027405-B2
Application number	US-201816205284-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	May 31, 2016
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

An oscillating power tool, including: a housing; an output shaft for installing a working head, the output shaft being installed in the housing and extending out of the housing; a transmission mechanism, installed in the housing, and the transmission mechanism being connected to the output shaft; and a motor, installed in the housing, the motor being connected to the transmission mechanism and driving the transmission mechanism to drive the output shaft to move, where an outer diameter of the motor is in a range of 40 mm to 50 mm.

First claim

What is claimed is:

1. An oscillating power tool, comprising:
a housing;
an output shaft for installing a working head, the output shaft being installed in the housing and extending out of the housing;
a transmission mechanism being configured to be installed in the housing and to be connected to the output shaft; and
a motor being installed in the housing, and the motor comprising: a stator; a rotor, rotatable relative to the stator; and an armature shaft being fixedly connected to the rotor, and wherein the armature shaft is connected to the transmission mechanism, and the transmission mechanism converts rotation of the armature shaft into reciprocation of the output shaft around an axis per se, wherein a no-load rotation speed of the motor is greater than 20000 revolutions/minute, and a ratio of output power of the motor to a volume of the motor is greater than 2 W/cm 3 .

2. The oscillating power tool according to claim 1 , wherein an outer diameter of the motor is in a range of 40 mm to 50 mm.

3. The oscillating power tool according to claim 2 , wherein the housing is provided with a gripping portion, and a peripheral perimeter of the gripping portion ranges from 150 mm to 200 mm.

4. The oscillating power tool according to claim 3 , wherein a ratio of the output power of the motor to the peripheral perimeter of the gripping portion is greater than 0.95 W/mm.

5. The oscillating power tool according to claim 1 , wherein the no-load rotation speed of the motor is greater than 30000 revolutions/minute, and the ratio of the output power of the motor to the volume is greater than 5 W/cm3.

6. The oscillating power tool according to claim 5 , wherein the housing is provided with a gripping portion, a peripheral perimeter of the grip portion ranges from 150 mm to 200 mm, and a ratio of the output power of the motor to the peripheral perimeter of the gripping portion are greater than 2.0 W/mm.

7. The oscillating power tool according to claim 1 , wherein a ratio of an outer diameter of the rotor to an outer diameter of the stator ranges from 0.60 to 0.70, and a yoke width of the stator ranges from 3.5 mm to 4.0 mm.

8. The oscillating power tool according to claim 1 , wherein an axial length of the motor ranges from 45 mm to 60 mm.

9. The oscillating power tool according to claim 1 , wherein the housing comprises an outer housing and an inner housing;
the outer housing covers the outside of the inner housing;
the motor, the transmission mechanism, and the output shaft are all received in the inner housing;
wherein the outer housing is provided with a gripping portion, and a peripheral perimeter of the gripping portion ranges from 165 mm to 215 mm;
wherein the inner housing comprises a motor housing and a head housing; and
the output shaft and the transmission mechanism are received in the head housing and the motor is received in the motor housing.

10. The oscillating power tool according to claim 9 , wherein it further comprises a vibration-damping element, and wherein
the vibration-damping element is disposed between the head housing and the outer housing;
or the vibration-damping element is disposed between the motor housing and the outer housing;
and the vibration-damping element is a vibration-damping block, a vibration-damping pat, or a vibration-damping ring.

11. An oscillating power tool, comprising:
a housing;
an output shaft for installing a working head, the output shaft being installed in the housing and extending out of the housing;
a transmission mechanism being configured to be installed in the housing and to be connected to the output shaft; and
a motor being installed in the housing, and the motor comprising: a stator; a rotor, rotatable relative to the stator; and an armature shaft being fixedly connected to the rotor, and the armature shaft is connected to the transmission mechanism, and the transmission mechanism converts rotation of the armature shaft into reciprocation of the output shaft around an axis per se, a no-load rotation speed of the motor is greater than 38000 revolutions/minute, and a ratio of output power of the motor to a volume of the motor is greater than 8.5 W/cm3.

12. The oscillating power tool according to claim 11 , wherein an outer diameter of the motor is in a range of 40 mm to 50 mm.

13. The oscillating power tool according to claim 12 , wherein the housing is provided with a gripping portion, and a peripheral perimeter of the gripping portion ranges from 150 mm to 185 mm, a ratio of the output power of the motor to the peripheral perimeter of the gripping portion is greater than 5 W/mm.

14. The oscillating power tool according to claim 11 , wherein an axial length of the motor ranges from 45 mm to 60 mm, a ratio of an outer diameter of the rotor to an outer diameter of the stator ranges from 0.60 to 0.70, and a yoke width of the stator ranges from 3.6 mm to 4.2 mm.

15. The oscillating power tool according to claim 11 , wherein the housing comprises an outer housing and an inner housing;
the outer housing covers the outside of the inner housing;
the motor, the transmission mechanism, and the output shaft are all received in the inner housing;
the outer housing is provided with a gripping portion, and a peripheral perimeter of the gripping portion ranges from 165 mm to 215 mm;
the inner housing comprises a motor housing and a head housing; and
the output shaft and the transmission mechanism are received in the head housing and the motor is received in the motor housing.

Assignees

• Positec Power Tools Suzhou Co Ltd

Inventors

• Zhang Shisong
• Pang Xiaoli
• Zhong Hongfeng
• Wu Yu
• Li Weifeng
• Zhao Xiao
• Zhou zhongya
• Wu Hongbing
• Wu Haiquan
• Bian Yinhang
• Lu Hui
• Li Hui
• Zhang Wei

Classifications

• H02K5/207

  with openings in the casing specially adapted for ambient air · CPC title

• H02K23/08

  having series connection of excitation windings · CPC title

• H02K5/143

  for cooperation with commutators · CPC title

• H02K5/161

  radially supporting the rotary shaft at both ends of the rotor (H02K5/165, H02K5/167, H02K5/173 take precedence) · CPC title

• H02K1/185

  to outer stators · CPC title