Oscillating electric power tool with balanced armature shaft
US-2018111244-A1 · Apr 26, 2018 · US
Electric motor for a power tool
US10476350B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10476350-B2 |
| Application number | US-201715676214-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 14, 2017 |
| Priority date | Nov 6, 2012 |
| Publication date | Nov 12, 2019 |
| Grant date | Nov 12, 2019 |
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Abstract
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An electric motor includes first and second balancing members coupled to an output shaft for rotation with a rotor. The first and second balancing members substantially balance a mass of the rotor about a longitudinal axis of the output shaft to reduce vibrations of the electric motor during use. The first balancing member includes a brass bushing supported on the output shaft adjacent a first face of the body of the rotor. The brass bushing includes a hole drilled into an outer circumference of the brass bushing providing a first balancing feature of the electric motor. The second balancing member includes a fan supported on the output shaft adjacent a second face of the body of the rotor. The fan includes a plurality of fins extending from a first face of the fan and a second balancing feature of material removed from a second face of the fan.
First claim
Opening claim text (preview).
What is claimed is: 1. An electric motor for the use with a power tool, the electric motor comprising: a rotor including a body and a plurality of magnets coupled to the body; a stator including a plurality of electromagnetic coils surrounding the rotor; an output shaft coupled to the rotor for rotation with the rotor, the output shaft defining a longitudinal axis about which the rotor rotates; and first and second balancing members coupled to the output shaft for rotation with the rotor, the first and second balancing members substantially balancing a mass of the rotor about the longitudinal axis to reduce vibrations of the electric motor during use; wherein the first balancing member includes a brass bushing supported on the output shaft adjacent a first face of the body of the rotor, the brass bushing including a hole drilled into an outer circumference of the brass bushing providing a first balancing feature of the electric motor; and wherein the second balancing member includes a fan supported on the output shaft adjacent a second face of the body of the rotor, the fan including a plurality of fins extending from a first face of the fan and a second balancing feature of material removed from a second face of the fan. 2. The electric motor of claim 1 , further comprising a bearing supported on the output shaft, wherein the first balancing member is located between the first face of the body of the rotor and the bearing. 3. The electric motor of claim 1 , wherein the first balancing feature is formed on the brass bushing after the brass bushing is assembled on the output shaft. 4. The electric motor of claim 1 , wherein the fan is supported on a second bushing that surrounds a portion of the output shaft adjacent the second face of the body of the rotor. 5. A power tool comprising: a housing; a drive mechanism positioned within the housing; and an electric motor positioned within the housing and operable to drive the drive mechanism, the motor including a rotor including a body and a plurality of magnets coupled to the body, a stator including a plurality of electromagnetic coils surrounding the rotor, an output shaft coupled to the rotor for rotation with the rotor and coupled to the drive mechanism to drive the drive mechanism, the output shaft defining a longitudinal axis about which the rotor rotates, and first and second balancing members coupled to the output shaft for rotation with the rotor, the first and second balancing members substantially balancing a mass of the rotor about the longitudinal axis to reduce vibrations of the electric motor during use; wherein the first balancing member includes a brass bushing supported on the output shaft adjacent a first face of the body of the rotor, the brass bushing including a hole drilled into an outer circumference of the brass bushing providing a first balancing feature of the electric motor; and wherein the second balancing member includes a fan supported on the output shaft adjacent a second face of the body of the rotor, the fan including a plurality of fins extending from a first face of the fan and a second balancing feature of material removed from a second face of the fan. 6. The power tool of claim 5 , wherein the motor further includes a bearing supported on the output shaft, and wherein the first balancing member is located between the first face of the body of the rotor and the bearing. 7. The power tool of claim 5 , wherein the first balancing feature is formed on the brass bushing after the brass bushing is assembled on the output shaft. 8. The power tool of claim 5 , wherein the fan is supported on a second bushing that surrounds a portion of the output shaft adjacent the second face of the body of the rotor.
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- What does patent US10476350B2 cover?
- An electric motor includes first and second balancing members coupled to an output shaft for rotation with a rotor. The first and second balancing members substantially balance a mass of the rotor about a longitudinal axis of the output shaft to reduce vibrations of the electric motor during use. The first balancing member includes a brass bushing supported on the output shaft adjacent a first …
- Who is the assignee on this patent?
- Milwaukee Electric Tool Corp
- What technology area does this patent fall under?
- Primary CPC classification H02K7/145. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Nov 12 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).