Battery-powered stand-alone motor unit

Patent metadata

Field	Value
Publication number	US-2023412041-A1
Application number	US-202318456073-A
Country	US
Kind code	A1
Filing date	Aug 25, 2023
Priority date	Dec 23, 2019
Publication date	Dec 21, 2023
Grant date	—

Abstract

A method of assembling a stand-alone motor unit and a piece of power equipment includes moving the motor unit in a first direction onto the piece of power equipment, such that a protrusion of the piece of power equipment is received in a slot of the motor unit. The method further comprises moving the motor unit along the piece of power equipment in a second direction that is perpendicular to the first direction, such that the protrusion moves within the slot from a first position to a second position, in which the protrusion is inhibited from moving in a direction opposite the first direction. The method further comprises coupling a power take-off shaft of the motor unit to a rotational input of the piece of power equipment, such that torque from the motor unit can be transferred to the rotational input to operate the piece of power equipment.

First claim

1 . A method of assembling a stand-alone motor unit and a piece of power equipment, the method comprising:
moving the motor unit in a first direction onto the piece of power equipment, such that a protrusion of the piece of power equipment is received in a slot of the motor unit; moving the motor unit along the piece of power equipment in a second direction that is perpendicular to the first direction, such that the protrusion moves within the slot from a first position to a second position, in which the protrusion is inhibited from moving in a direction opposite the first direction; and coupling a power take-off shaft of the motor unit to a rotational input of the piece of power equipment, such that torque from the motor unit can be transferred to the rotational input to operate the piece of power equipment.

2 . The method of claim 1 , further comprising, after coupling the power take-off shaft of the motor unit to the rotational input of the piece of power equipment, decoupling the power take-off shaft of the motor unit from the rotational input of the piece of power equipment.

3 . The method of claim 2 , further comprising, after decoupling the power take-off shaft of the motor unit from the rotational input of the piece of power equipment, moving the motor unit in a direction opposite the second direction, such that the protrusion moves within the slot from the second position to the first position.

4 . The method of claim 3 , further comprising, after moving the protrusion within the slot from the second position to the first position, moving the motor unit in direction opposite the first direction to remove the motor unit from the piece of power equipment.

5 . A power equipment assembly comprising:
a stand-alone motor unit including
a housing,
an electric motor arranged in the housing,
a battery pack to provide power to the motor, and
a gear train receiving torque from the motor and including a drive gear having a passage with a first plurality splines and a plurality of detents biased toward the passage; and
a power equipment unit including a shaft that is removably receivable in the passage of the drive gear, the shaft including a circumferential recess and a second plurality of splines configured to mate with the first plurality of splines when the shaft is received in the passage, such that the shaft is coupled for rotation with the drive gear and the power equipment unit can be driven by the stand-alone motor unit, wherein when the shaft is received in the passage, the detents are biased into the circumferential recess of the power take-off shaft, inhibiting removal of the shaft from the passage of the drive gear.

6 . The power equipment assembly of claim 5 , wherein the power equipment unit includes an impeller coupled for rotation with the shaft.

7 . The power equipment assembly of claim 5 , wherein the power equipment unit includes a pulley coupled for rotation with the shaft.

8 . The power equipment assembly of claim 5 , wherein the power equipment unit includes a pump configured to be driven in response to rotation of the shaft.

9 . A stand-alone motor unit for use with a piece of power equipment having a first pulley and a belt, the motor unit comprising:
a housing; an electric motor located within the housing; a power take-off shaft receiving torque from the motor and protruding from the housing; a second pulley arranged on the power take-off shaft and configured to receive the belt, such that the second pulley can drive the first pulley via the belt; an idler pulley configured to increase tension within the belt between the first and second pulleys; and a battery pack to provide power to the motor.

10 . The stand-alone motor unit of claim 9 , wherein the idler pulley is biased toward the belt.

11 . The stand-alone motor unit of claim 9 , wherein the idler pulley is arranged on a tension arm that is biased toward the belt.

12 . The stand-alone motor unit of claim 9 , further comprising a pivot post on which the tension arm is pivotably coupled.

13 .- 17 . (canceled)

Assignees

• Milwaukee Electric Tool Corp

Inventors

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

Classifications

• H02K7/003 Primary

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · 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

• H02K11/0094

  Structural association with other electrical or electronic devices · CPC title

• H02K11/33

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