Power tool

Patent metadata

Field	Value
Publication number	US-11027349-B2
Application number	US-202017112530-A
Country	US
Kind code	B2
Filing date	Dec 4, 2020
Priority date	Jun 5, 2018
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A power tool includes: a power assembly including a motor, the motor including a motor shaft rotatable about a motor axis; an output assembly including an output shaft; a transmission assembly; a first housing; a second housing; wherein the power tool is provided with a first vibration isolation plane and a second vibration isolation plane; the first vibration isolation plane is provided with a first vibration isolation block, and the second vibration isolation plane is provided with a second vibration isolation block; the whole composed of the first vibration isolation block and the second vibration isolation block is at least provided with a spacing portion between the first housing and the second housing; the second housing is spaced apart from the first housing at the spacing portion; the first vibration isolation block and the second vibration isolation block are separated from each other.

First claim

What is claimed is:

1. A power tool, comprising:
a power assembly comprising a motor, the motor having a motor shaft rotatable about a motor axis;
an output assembly comprising an output shaft configured to output power;
a transmission assembly configured to realize power transmission between the power assembly and the output assembly;
a first housing supporting at least the power assembly, the transmission assembly and the output assembly; and
a second housing surrounding at least part of the first housing, the second housing being further formed with a handle portion configured for a user to hold;
wherein the power tool is provided with a first vibration isolation plane and a second vibration isolation plane, the first vibration isolation plane is provided with a first vibration isolation block, the second vibration isolation plane is provided with a second vibration isolation block, a whole composed of the first vibration isolation block and the second vibration isolation block is at least provided with a spacing portion provided between the first housing and the second housing, the second housing is spaced apart from the first housing at the spacing portion, the first vibration isolation block and the second vibration isolation block are separated from each other, and at least part of the first vibration isolation block or at least part of the second vibration isolation block is arranged inside the handle portion, and
wherein a structure of the power tool that generates vibration is defined as a vibrating body, the vibrating body at least comprises the power assembly, the output assembly, the transmission assembly and the first housing, the vibrating body has a center of gravity, a length of the vibrating body in a direction along the motor axis is L, the first vibration isolation plane and the motor axis are perpendicular to each other, and a distance between the first vibration isolation plane and the center of gravity of the vibrating body along the motor axis is L 1 , and a ratio of the distance L 1 between the first vibration isolation plane and the center of gravity of the vibrating body in the motor axis to the length L of the vibrating body in the motor axis is greater than or equal to 0 and less than or equal to 0.3.

2. The power tool of claim 1 , wherein the second vibration isolation plane and the motor axis are perpendicular to each other, a distance between the first vibration isolation plane and the second vibration isolation plane is L 2 , a ratio of the distance L 2 between the first vibration isolation plane and the second vibration isolation plane to the length L of the vibrating body along the motor axis is greater than or equal to 0.3 and less than or equal to 0.7.

3. The power tool of claim 1 , wherein the center of gravity of the vibrating body is arranged between the first vibration isolation plane and the second vibration isolation plane.

4. The power tool of claim 1 , wherein the vibrating body further defines a third vibration isolation plane perpendicular to the motor axis, a third vibration isolation block is provided on the third vibration isolation plane, and the third vibration isolation plane is arranged between the first vibration isolation plane and the second vibration isolation plane.

5. The power tool of claim 1 , wherein the first vibration isolation plane and the second vibration isolation plane are parallel to each other, and the first vibration isolation block and the second vibration isolation block are spaced apart from each other in a direction perpendicular to the first vibration isolation plane.

6. The power tool of claim 1 , wherein the first housing is symmetrical about a mid-plane, the number of the first vibration isolation blocks is at least two, and the first vibration isolation blocks are symmetrically distributed on both sides of the mid-plane.

7. The power tool of claim 1 , wherein the first vibration isolation plane and the second vibration isolation plane are parallel to each other and an orthographic projection of the second vibration isolation block of the second vibration isolation plane on a plane parallel to the first vibration isolation plane and an orthographic projection of the first vibration isolation block of the first vibration isolation plane on that plane at least partially intersect.

8. The power tool of claim 1 , wherein the output shaft is capable of oscillating about an output shaft axis within an oscillating angle A and the oscillating angle A of the output shaft is greater than or equal to 3.6 and less than or equal to 5.

9. The power tool of claim 1 , wherein the motor has a maximum rotational speed of R rpm and the maximum rotational speed R of the motor is greater than or equal to 20,000 and less than or equal to 22,000.

10. The power tool of claim 1 , wherein the number of the first vibration isolation blocks is at least two, the first vibration isolation blocks are sequentially arranged in a circumferential direction around the motor axis, and, in the circumferential direction, two adjacent first vibration isolation blocks have a gap in between.

11. The power tool of claim 1 , wherein the output shaft is capable of oscillating about an output shaft axis within an oscillating angle A, the transmission assembly comprises a hit portion and an oscillating rod enabled to be hit by the hit portion in a direction F of an excitation force, and a direction D of a positive stiffness of at least one first vibration isolation block and the direction F of the excitation force form an angle greater than or equal to 0 degrees and less than or equal to 60 degrees.

12. The power tool of claim 11 , wherein the direction D of the positive stiffness of at least one first vibration isolation block is parallel to the direction F of the excitation force.

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Ling Qi
• Wang Rong
• Li Yang

Classifications

• B25F5/006

  Vibration damping means · CPC title

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B27B19/006

  with oscillating saw blades; Hand saws with oscillating saw blades · CPC title

• B25F5/00

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• B24B23/04 Primary

  with oscillating grinding tools; Accessories therefor · CPC title