Power tool

Patent metadata

Field	Value
Publication number	US-12134177-B2
Application number	US-202318448273-A
Country	US
Kind code	B2
Filing date	Aug 11, 2023
Priority date	Aug 26, 2022
Publication date	Nov 5, 2024
Grant date	Nov 5, 2024

Abstract

A power tool includes a housing, a motor, a ball sleeve, an oscillating member with a mounting portion, and an output shaft rotating around an output shaft axis. The oscillating member and the ball sleeve are engaged in an engagement region on the oscillating member, and the geometric center of the engagement region is an engagement center. A first plane bisects the first bearing assembly along a direction of the output shaft axis, and a second plane bisects the second bearing assembly along the direction of the output shaft axis. The height from the engagement center to the first plane is a first height H1, the height from the engagement center to the second plane is a second height H2, and the ratio H1/H2 of the first height H1 to the second height H2 is greater than or equal to 0.5 and less than or equal to 1.4.

First claim

What is claimed is:

1. A power tool, comprising:
a housing;
a motor rotatable around a motor axis;
a ball sleeve sleeved on a motor shaft and driven by the motor shaft to move;
an oscillating member driven by the ball sleeve to oscillate; and
an output shaft driven by the oscillating member to rotate around an output shaft axis; and
a first bearing assembly and a second bearing assembly sleeved on the output shaft;
wherein the oscillating member comprises a mounting portion sleeved on the output shaft, the first bearing assembly is located on an upper side of the mounting portion, the second bearing assembly is located on a lower side of the mounting portion, the oscillating member and the ball sleeve are engaged in an engagement region on the oscillating member, a geometric center of the engagement region is defined as an engagement center, a first plane bisects the first bearing assembly along a direction of the output shaft axis, the first plane is perpendicular to the output shaft axis, a second plane bisects the second bearing assembly along the direction of the output shaft axis, the second plane is perpendicular to the output shaft axis, a height from the engagement center to the first plane is a first height H1, a height from the engagement center to the second plane is a second height H2, and a ratio H1/H2 of the first height H1 to the second height H2 is greater than or equal to 0.5 and less than or equal to 1.4.

2. The power tool of claim 1 , wherein the ratio H1/H2 of the first height H1 to the second height H2 is greater than or equal to 0.6 and less than or equal to 1.4.

3. The power tool of claim 1 , wherein a difference between the first height H1 and the second height H2 is less than or equal to 10 mm.

4. The power tool of claim 1 , wherein the first bearing assembly comprises a first bearing, and the second bearing assembly comprises a second bearing.

5. The power tool of claim 4 , wherein the first bearing assembly further comprises a third bearing, and the third bearing is located above the first bearing.

6. The power tool of claim 4 , wherein the second bearing assembly further comprises a fourth bearing, and the fourth bearing is located below the second bearing.

7. The power tool of claim 1 , wherein a third plane perpendicular to the output shaft axis exists, the third plane bisects the mounting portion along the direction of the output shaft axis, a distance from the engagement center to the third plane is a third distance H3, and the third distance H3 is less than or equal to 12 mm.

8. The power tool of claim 1 , wherein the engagement center comprises a first engagement center on a left side and a second engagement center on a right side.

9. The power tool of claim 1 , wherein a distance from the engagement center to the output shaft axis is a first radius R1, and the first radius R1 is less than or equal to 32 mm.

10. The power tool of claim 9 , wherein the mounting portion is sleeved on an outer circumference of the output shaft, an inner radius of the mounting portion is a second radius R2, and a ratio R2/R1 of the second radius R2 to the first radius R1 is greater than or equal to 0.34 and less than 1.

11. The power tool of claim 1 , further comprising a shock absorbing mechanism for performing shock absorbing on the power tool, wherein the shock absorbing mechanism comprises a first shock absorbing assembly and a second shock absorbing assembly, each of the first shock absorbing assembly and the second shock absorbing assembly comprises at least one shock absorber, a maximum span formed by the first shock absorbing assembly and the second shock absorbing assembly along a direction of the motor axis is defined as a first length T1, and the first length T1 is greater than or equal to 110 mm.

12. The power tool of claim 1 , further comprising a shock absorbing mechanism for performing shock absorbing on the power tool, wherein the shock absorbing mechanism comprises a first shock absorbing assembly and a second shock absorbing assembly, a minimum distance between the first shock absorbing assembly and the second shock absorbing assembly is defined as a third length T3, the third length T3 is greater than or equal to 30 mm, each of the first shock absorbing assembly and the second shock absorbing assembly comprises at least one shock absorber, the first shock absorbing assembly has a first shock absorbing center C 1 , the second shock absorbing assembly has a second shock absorbing center C 2 , a distance from the first shock absorbing center C 1 to the output shaft axis is defined as a first distance L1, a distance from the second shock absorbing center C 2 to the first shock absorbing center C 1 is defined as a second distance L2, and a ratio of the first distance L1 to the second distance L2 is less than or equal to 0.27.

13. The power tool of claim 1 , wherein the oscillating member and the ball sleeve are engaged in the engagement region on the oscillating member, the geometric center of the engagement region is defined as the engagement center, and a distance from the engagement center to the output shaft axis is a first radius R1, wherein the first radius R1 is less than or equal to 32 mm.

14. The power tool of claim 1 , further comprising a fan for heat dissipation, wherein the fan comprises fan blades, a base plate, and a support portion, the fan blades are arc-shaped, each of the fan blades comprises a root and a tail, the root is connected to the support portion, an airflow flows out along the tail, and the fan blades are partially integrated into the base plate and partially exposed from the base plate.

15. The power tool of claim 14 , wherein a circle formed by connecting tails of a plurality of fan blades is defined as an outer circle, a diameter of the base plate is a first diameter d1, a diameter of the outer circle is a second diameter d2, and a ratio of the second diameter d2 to the first diameter d1 is greater than or equal to 1.05 and less than or equal to 1.18.

16. A power tool, comprising:
a housing;
a motor rotatable around a motor axis;
a ball sleeve sleeved on a motor shaft and driven by the motor shaft to move;
an oscillating member driven by the ball sleeve to oscillate;
an output shaft driven by the oscillating member to rotate around an output shaft axis, and
a first bearing assembly and a second bearing assembly sleeved on the output shaft;
wherein the oscillating member comprises a mounting portion sleeved on the output shaft, the first bearing assembly is located on an upper side of the mounting portion, the second bearing assembly is located on a lower side of the mounting portion, the oscillating member and the ball sleeve are engaged in an engagement region on the oscillating member, a geometric center of the engagement region is defined as an engagement center, a first plane bisects the first bearing assembly along a direction of the output shaft axis, the first plane is perpendicular to the output shaft axis, a second plane bisects the second bearing assembly along the direction of the output shaft axis, the second plane is perpendicular to the output shaft axis, a height from the engagement center to the first plane is a first height H1, a height from the engagement center to the second plane is a second height H2, and a difference between the first height H1 and the second height H2 is less than or equal to 10 mm.

17. The power tool of claim 16 , wherein a ratio H1/H2 of the first height H1 to the second height H2 is greater than or equal to 0.6 and less than or equal to 1.4.

18. The powe

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Li Yang
• Zhan Rui
• Xu Zhongquan
• Wang Rong
• Zhang Yi

Classifications

• B25F5/008

  Cooling means · CPC title

• B25F3/00

  Associations of tools for different working operations with one portable power-drive means; Adapters therefor · CPC title

• B25F5/006 Primary

  Vibration damping means · CPC title

• B23D61/006

  Oscillating saw blades · CPC title

• B23D51/10

  for hand-held or hand-operated devices · CPC title