公开(公告)号：US10326337B2

公开(公告)日：2019-06-18

申请号：US14792008

申请日：2015-07-06

Applicant: MAKITA CORPORATION

Inventor： Motohiro Omura ,  Ryosuke Suzuki ,  Hideyuki Taga

IPC: H02K9/22 ,  B24B23/02 ,  H05K7/20 ,  B25F5/00 ,  H02K7/14 ,  H02K11/33

Abstract: In an electric power tool which houses a motor and a controller for controlling drive of the motor, the controller has a circuit board on which electric components are mounted and a heat radiation member which radiates heat of the electric components. The heat radiation member has a facing part which faces the circuit board in parallel to a board surface of the circuit board. The facing part is provided with steps by which a distance between the facing part and the board surface of the circuit board varies. Furthermore, the facing part of the heat radiation member is provided with a first facing part in which a relative distance with respect to the board surface of the circuit board is reduced.

公开(公告)号：US11075564B2

公开(公告)日：2021-07-27

申请号：US16739190

申请日：2020-01-10

Applicant: MAKITA CORPORATION

Inventor： Fuminari Fujii ,  Ryosuke Suzuki

IPC: H01R39/38 ,  H02K5/14 ,  H02K7/14 ,  B24B23/02

Abstract: A power tool includes a brush holder with a brush positioned more accurately with respect to a commutator. A grinder as a power tool includes a housing, a stator fixed to the housing, a rotor rotatable relative to the stator and including a commutator and a coil, a brush that comes in contact with the commutator, a brush-holding metal plate having a screw hole and holding the brush, and a screw extending through the screw hole and directly fastened to the housing.

公开(公告)号：US10562115B2

公开(公告)日：2020-02-18

申请号：US15631949

申请日：2017-06-23

Applicant: MAKITA CORPORATION

Inventor： Ryosuke Suzuki ,  Akira Niwa

IPC: H02K7/14 ,  B23D47/02 ,  B25F5/00 ,  B23B45/00 ,  B23B45/02 ,  B23D51/02 ,  B27B9/00

Abstract: A covering member made of a resin is integrally molded with a sensor substrate of a brushless motor in a circular saw by low-temperature, low-pressure injection molding. The covering member covers rotation detecting elements, a thermistor, resistors, and connecting portions (terminals) of lead wires that serve as electrically conductive portions conducting electric currents.