US 11,872,668 B2Granted

Portable power tool

AssigneeMakita Corporation

InventorChitphong Kuntheeya

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Abstract

A portable power tool includes an electric motor having a motor shaft, an output shaft arranged in parallel to the motor shaft and configured to be driven by rotation of the motor shaft, a tool accessory operably connected to the output shaft and configured to undergo an orbital and/or rotational motion in response to rotation of the output shaft, a first bearing that rotatably supports the output shaft, and a second bearing that rotatably supports the output shaft and is arranged closer to the tool accessory than the first bearing in an axial direction in which the output shaft extends. The first and second bearings are arranged at positions that do not overlap with a radially outermost one of components of the electric motor when viewed in a shaft arrangement direction in which the motor shaft and the output shaft are arranged in parallel.

Claims20

Dependent claims

A portable power tool, comprising:

an electric motor including a motor shaft;
an output shaft arranged non-coaxially with and in parallel to the motor shaft and configured to be driven by rotation of the motor shaft;
a tool accessory operably connected to the output shaft and configured undergo an orbital and/or rotational motion in response to rotation of the output shaft;
a first bearing that rotatably supports the output shaft;
a second bearing that rotatably supports the output shaft and is arranged closer to the tool accessory than the first bearing in an axial direction in which the output shaft extends, and
a third bearing that connects the output shaft and the tool accessory and is arranged closer to the tool accessory than the second bearing in the axial direction and eccentrically to the output shaft,
wherein the first and second bearings are arranged at positions such that a radially outermost component of the electric motor is interposed between at least outer rings of the first and second bearings in a direction parallel to the axial direction of the output shaft.

4 more elements

A hand-held power tool, comprising:

an electric motor having a motor shaft;
an output shaft arranged in parallel to the motor shaft and configured to be driven by rotation of the motor shaft;
a tool accessory operably connected to the output shaft and configured undergo an orbital and/or rotational motion in response to rotation of the output shaft;
a first bearing that rotatably supports the output shaft;
and
a second bearing that rotatably supports the output shaft and is arranged closer to the tool accessory than the first bearing in an axial direction of the output shaft,
wherein:
the first and second bearings are arranged at positions such that a radially outermost component of the electric motor is interposed between at least outer rings of the first and second bearings in a direction parallel to the axial direction of the output shaft, and
at least part of the radially outermost component of the electric motor is located at a position closer to the output shaft than radially outer edges of the outer rings of the first and second bearings.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/374,305Filed 13 Jul 2021
Priority: JP 2020-12163015 Jul 2020
Published: US 2022/0016738 A120 Jan 2022
Granted: 16 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B24B 23/03
With rotating grinding tools; Accessories therefor: the tool being driven in a combined movement
B24B 23/04
Portable grinding machines, e.g. hand-guided; Accessories therefor: with oscillating grinding tools; Accessories therefor
B24B 41/047
Headstocks; Working-spindles; Features relating thereto: grinding heads for working on plane surfaces
B24B 41/0475
Grinding heads for working on plane surfaces: equipped with oscillating abrasive blocks, e.g. mounted on a rotating head