Electric working machine

Patent metadata

Field	Value
Publication number	US-12390868-B2
Application number	US-202318093372-A
Country	US
Kind code	B2
Filing date	Jan 5, 2023
Priority date	Jan 7, 2022
Publication date	Aug 19, 2025
Grant date	Aug 19, 2025

Abstract

An electric working machine may include an output shaft, a rotary blade attached to the output shaft, an output pulley fixed to the output shaft, an input shaft, an input pulley fixed to the input shaft, a transmission belt wrapped around the input pulley and the output pulley, an electric motor including a motor shaft and configured to rotate the motor shaft, a speed reducer configured to reduce a speed of rotation of the motor shaft and transmit the rotation to the input shaft, and a housing that houses the electric motor and the speed reducer, and rotatably supports the input shaft and the output shaft. A rotation axis of the motor shaft may be inclined with respect to a direction which is along a rotation axis of the output shaft.

First claim

What is claimed is:

1. An electric working machine comprising:
an output shaft;
a rotary blade attached to the output shaft;
an output pulley fixed to the output shaft;
an input shaft;
an input pulley fixed to the input shaft;
a transmission belt wrapped around the input pulley and the output pulley;
an electric motor comprising a motor shaft and configured to rotate the motor shaft;
a speed reducer configured to reduce a speed of rotation of the motor shaft and transmit the rotation to the input shaft; and
a housing that houses the electric motor and the speed reducer, and rotatably supports the input shaft and the output shaft,
wherein a rotation axis of the motor shaft is inclined with respect to a direction which is along a rotation axis of the output shaft, and
when the electric working machine is placed on a placement surface, the rotation axis of the output shaft is arranged along a left-right direction in a vicinity of a front end of the housing, and in a side view of the electric working machine, the rotation axis of the motor shaft is inclined at an angle within a range from −45° to 45° with respect to an up-down direction.

2. The electric working machine according claim 1 , wherein the rotation axis of the motor shaft is orthogonal to the direction which is along the rotation axis of the output shaft.

3. The electric working machine according claim 1 , wherein when the electric working machine is placed on the placement surface,
in the side view of the electric working machine, the rotation axis of the motor shaft is inclined with respect to the up-down direction such that the rotation axis of the motor shaft leans forward as it extends downward.

4. The electric working machine according claim 3 , wherein, in the side view of the electric working machine, the rotation axis of the motor shaft is substantially orthogonal to a line passing through the rotation axis of the output shaft and the rotation axis of the input shaft.

5. The electric working machine according claim 1 , further comprising:
a first handle disposed on the housing and configured to be grasped by a user with one hand; and
a second handle disposed on the housing and configured to be grasped by the user with the other hand,
wherein when the electric working machine is placed on the placement surface,
the first handle is offset rearwardly from the rotary blade and forwardly from the electric motor, and
the second handle is offset rearwardly from the electric motor.

6. The electric working machine according claim 5 , further comprising at least one battery pack configured to be attached to and detached from the housing and supply power to the electric motor.

7. The electric working machine according claim 6 , wherein when the electric working machine is placed on the placement surface,
the at least one battery pack is offset rearwardly from the electric motor and forwardly from the second handle.

8. The electric working machine according claim 7 , wherein when the electric working machine is placed on the placement surface,
in a rear view of the electric working machine, the at least one battery pack and the electric motor at least partially overlap.

9. The electric working machine according claim 7 , wherein when the electric working machine is placed on the placement surface,
in a rear view of the electric working machine, the rotary blade and the electric motor at least partially overlap.

10. The electric working machine according claim 4 , further comprising:
a first handle disposed on the housing and configured to be grasped by a user with one hand;
a second handle disposed on the housing and configured to be grasped by the user with the other hand; and
at least one battery pack configured to be attached to and detached from the housing and supply power to the electric motor,
wherein when the electric working machine is placed on the placement surface,
the first handle is offset rearwardly from the rotary blade and forwardly from the electric motor,
the second handle is offset rearwardly from the electric motor,
the at least one battery pack is offset rearwardly from the electric motor and forwardly from the second handle,
in a rear view of the electric working machine, the at least one battery pack and the electric motor at least partially overlap, and
in the rear view of the electric working machine, the rotary blade and the electric motor at least partially overlap.

Assignees

• Makita Corp

Inventors

• Sumi Takuya
• Tsuda Sho
• Taniguchi Koki

Classifications

• B23D45/003 Primary

  for particular purposes · CPC title

• B23D47/12

  of drives for circular saw blades · CPC title

• B25F5/001

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B28D1/045

  Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut · CPC title

• B23D45/16 Primary

  Hand-held sawing devices with circular saw blades · CPC title