US 12,273,002 B2
Electric work machine and manufacturing method therefor
Yoshinori Sasaki, Anjo (JP); and Yoshihiro Kimura, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Filed by MAKITA CORPORATION, Anjo (JP)
Filed on Apr. 7, 2022, as Appl. No. 17/658,322.
Claims priority of application No. 2021-069252 (JP), filed on Apr. 15, 2021.
Prior Publication US 2022/0337117 A1, Oct. 20, 2022
Int. Cl. H02K 5/02 (2006.01); H02K 1/16 (2006.01); H02K 1/27 (2022.01); H02K 7/00 (2006.01); H02K 7/14 (2006.01); H02K 9/06 (2006.01)
CPC H02K 5/02 (2013.01) [H02K 1/16 (2013.01); H02K 1/27 (2013.01); H02K 7/003 (2013.01); H02K 7/14 (2013.01); H02K 9/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electric work machine comprising:
a motor housing including a tube part and a bottom part;
a brushless motor including a stator, and a rotor, which is disposed within the stator and is rotatable relative to the stator about a rotational axis, the stator having a first contact surface on a first axial end surface that extends perpendicular to the rotational axis;
a tubular member made of a polymer, the tubular member having protruding parts that are circumferentially distributed around the tubular member, and at least three screw-hole parts that are circumferentially distributed around the tubular member and are respectively interleaved between two circumferentially-adjacent ones of the protruding parts; and
an output part;
wherein:
the stator includes a stator core, which has a tube shape and has a second contact surface on a second axial end surface that extends perpendicular to the rotational axis and parallel to the first axial end surface, and a plurality of coils wound on the stator core;
the stator is held by the motor housing such that the first contact surface is in contact with the bottom part of the motor housing;
the rotor includes a rotor shaft, which is rotatably supported by the motor housing, a rotor core, which is fixed to the rotor shaft, and one or more permanent magnets, which is (are) supported by the rotor core;
the second contact surface of the stator core is ring-shaped;
the protruding parts of the tubular member and the at least three screw-hole parts press against the second contact surface of the stator core; and
the tubular member is fixed to the motor housing by at least three screws that respectively pass through the at least three screw-hole parts.