Battery-powered stand-alone motor unit

Patent metadata

Field	Value
Publication number	US-12294249-B2
Application number	US-202318133017-A
Country	US
Kind code	B2
Filing date	Apr 11, 2023
Priority date	Nov 8, 2019
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

A stand-alone motor unit includes a housing and an electric motor. The electric motor includes a stator, a rotor rotatable relative to the stator and having an output shaft, a housing in which the stator and rotor are arranged, and an adapter plate coupled to the housing. The adapter plate includes a first plurality of holes defining a first hole pattern. The output shaft of the rotor protrudes from the adapter plate. The motor unit further includes a battery pack for providing power to the motor, a power take-off shaft protruding from the housing, and a gearbox including a second plurality of holes defining a second hole pattern that is identical to the first hole pattern, such that when the first hole pattern is aligned with the second hole pattern, the gearbox is configured to be coupled to the adapter plate.

First claim

What is claimed is:

1. A stand-alone motor unit for use with a piece of power equipment, the motor unit comprising:
a housing;
an electric motor, the motor including
a stator,
a rotor rotatable relative to the stator, the rotor including an output shaft,
a housing in which the stator and rotor are arranged, and
an adapter plate coupled to the housing, the adapter plate including a first plurality of holes defining a first hole pattern, the output shaft of the rotor protruding from the adapter plate;

a battery pack for providing power to the motor;
a power take-off shaft protruding from the housing; and
a gearbox including
a second plurality of holes defining a second hole pattern that is identical to the first hole pattern, such that when the first hole pattern is aligned with the second hole pattern, the gearbox is configured to be coupled to the adapter plate, and
a gear train for transferring torque from the output shaft of the rotor to the power take-off shaft when the gearbox is coupled to the adapter plate.

2. The stand-alone motor unit of claim 1 , further comprising a fastener extending through one of the first plurality of holes and an aligned one of the second plurality of holes when the second hole pattern is aligned with the first hole pattern, such that the gearbox is coupled to the adapter plate.

3. The stand-alone motor unit of claim 2 , wherein the electric motor includes a back cover coupled to the housing, and wherein the fastener extends through the back cover, the housing of the electric motor, the adapter plate, and the gearbox.

4. The stand-alone motor unit of claim 1 , wherein the gearbox is coupled to the housing of the stand-alone motor unit.

5. The stand-alone motor unit of claim 1 , wherein the electric motor is coupled to the housing of the stand-alone motor unit.

6. The stand-alone motor unit of claim 1 , wherein the rotor has a diameter ranging from 70 millimeters to 120 millimeters.

7. The stand-alone motor unit of claim 1 , wherein each of the first plurality of holes is equidistant from a rotational axis defined by the output shaft of the rotor.

8. The stand-alone motor unit of claim 1 , wherein the gear train is a planetary gear train.

9. The stand-alone motor unit of claim 1 , wherein the gear train is a two-stage gear train.

10. The stand-alone motor unit of claim 1 , wherein the gear train is a transmission.

11. A stand-alone motor unit for use with a piece of power equipment, the motor unit comprising:
a housing;
an electric motor in the housing, the electric motor including
a stator,
a rotor rotatable relative to the stator, the rotor including an output shaft,
a housing in which the stator and rotor are arranged, and
an adapter plate coupled to the housing, the adapter plate including a first plurality of holes defining a first hole pattern that matches an matches an identical, second hole pattern defined in the piece of power equipment, the output shaft of the rotor protruding from the adapter plate; and

a battery pack for providing power to the motor;
wherein when the first hole pattern is aligned with the second hole pattern, the adapter plate is configured to be coupled to the piece of power equipment, such that the output shaft can drive the piece of power equipment.

12. The stand-alone motor unit of claim 11 , wherein the output shaft directly drives the piece of power equipment.

13. The stand-alone motor unit of claim 11 , wherein the output shaft indirectly drives the piece of power equipment.

14. The stand-alone motor unit of claim 13 , wherein the output shaft drives the piece of power equipment via a pulley.

15. The stand-alone motor unit of claim 13 , wherein the output shaft drives the piece of power equipment via a drive belt.

16. The stand-alone motor unit of claim 11 , further comprising a fastener extending through one of the first plurality of holes and an aligned one of the second plurality of holes when the second hole pattern is aligned with the first hole pattern, such that the piece of power equipment is coupled to the adapter plate.

17. The stand-alone motor unit of claim 16 , wherein the electric motor includes a back cover coupled to the housing, and wherein the fastener extends through the back cover, the housing of the electric motor, the adapter plate, and the piece of power equipment.

18. The stand-alone motor unit of claim 11 , wherein the rotor has a diameter ranging from 70 millimeters to 120 millimeters.

19. The stand-alone motor unit of claim 11 , wherein each of the first plurality of holes is equidistant from a rotational axis defined by the output shaft of the rotor.

20. A stand-alone motor unit assembly for use with a piece of power equipment, the motor unit assembly comprising:
a stand-alone motor unit including
a housing,
an electric motor, the motor including
a stator,
a rotor rotatable relative to the stator, the rotor including an output shaft,
a housing in which the stator and rotor are arranged, and
an adapter plate coupled to the housing, the adapter plate including a first plurality of holes defining a first hole pattern, the output shaft of the rotor protruding from the adapter plate,

a battery pack for providing power to the motor, and
a power take-off shaft protruding from the housing;

a first gearbox configured to be removably coupled to the adapter plate, the first gearbox including
a second plurality of holes defining a second hole pattern that is identical to the first hole pattern, such that when the first hole pattern is aligned with the second hole pattern of the first gearbox, the first gearbox is configured to be coupled to the adapter plate, and
a first gear train for transferring torque from the output shaft of the rotor to the power take-off shaft when the first gearbox is coupled to the adapter plate; and

a second gearbox configured to be removably coupled to the adapter plate, the second gearbox including
a third plurality of holes also arranged in the second hole pattern, such that when the first hole pattern is aligned with the second hole pattern of the second gearbox, the second gearbox is configured to be coupled to the adapter plate, and
a second gear train for transferring torque from the output shaft of the rotor to the power take-off shaft when the second gearbox is coupled to the adapter plate, the second gear train being different from the first gear train.

21. The stand-alone motor unit assembly of claim 20 , wherein the first gear train is a planetary gear train and the second gear train is a two-stage gear train.

22. The stand-alone motor unit assembly of claim 20 , further comprising a third gearbox configured to be removably coupled to the adapter plate, the third gearbox including
a fourth plurality of holes also arranged in the second hole pattern, such that when the first hole pattern is aligned with the second hole pattern of the third gearbox, the third gearbox is configured to be coupled to the adapter plate, and
a third gear train for transferring torque from the output shaft of the rotor to the power take-off shaft when the third gearbox is coupled to the adapter plate, the third gear train being different from the first and second gear trains.

23. The stand-alone motor unit assembly of claim 22 , wherein the first gear train is a planetary gear train, the second gear train is a two-stage gear train, and the third gear train is a transmission.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Sprague Connor P
• Glanzer Evan M
• Koller John E

Classifications

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H02K7/116

  with gears · CPC title

• H02K21/16

  having annular armature cores with salient poles (with homopolar co-operation H02K21/20) · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• E01C19/402

  the tools being hand-guided · CPC title