公开(公告)号：US20160020676A1

公开(公告)日：2016-01-21

申请号：US14792008

申请日：2015-07-06

Applicant: MAKITA CORPORATION

Inventor： Motohiro OMURA ,  Ryosuke SUZUKI ,  Hideyuki TAGA

IPC: H02K9/22 ,  H02K11/00 ,  H02K7/14

CPC classification number: H02K9/22 ,  B24B23/028 ,  B25F5/008 ,  H02K7/145 ,  H02K11/33 ,  H05K7/20436 ,  H05K7/205

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.

Abstract translation: 在容纳电动机的电动工具和用于控制电动机的驱动的控制器中，控制器具有安装有电气部件的电路板和辐射电气部件的热量的散热部件。 散热构件具有与电路板平行于电路板的板表面的面对部分。 面对部分设置有电路板的面对部分和电路板表面之间的距离变化的步骤。 此外，散热构件的面对部分设置有第一面对部分，其中相对于电路板的板表面的相对距离减小。

公开(公告)号：US20200266679A1

公开(公告)日：2020-08-20

申请号：US16739190

申请日：2020-01-10

Applicant: MAKITA CORPORATION

Inventor： Fuminari FUJII ,  Ryosuke SUZUKI

IPC: H02K5/14 ,  H02K7/14 ,  H01R39/38 ,  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：US20180029148A1

公开(公告)日：2018-02-01

申请号：US15631949

申请日：2017-06-23

Applicant: MAKITA CORPORATION

Inventor： Ryosuke SUZUKI ,  Akira NIWA

IPC: B23D47/02 ,  B27B9/00 ,  B23B45/02 ,  B23B45/00 ,  B23D51/02

CPC classification number: B23D47/02 ,  B23B45/001 ,  B23B45/008 ,  B23B45/02 ,  B23B2260/128 ,  B23D51/02 ,  B25F5/008 ,  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.

公开(公告)号：US20170317548A1

公开(公告)日：2017-11-02

申请号：US15485765

申请日：2017-04-12

Applicant: MAKITA CORPORATION

Inventor： Ryosuke SUZUKI ,  Akira NIWA

IPC: H02K3/34 ,  B23D47/12 ,  B23D45/16 ,  H02K1/14 ,  H02K11/30

CPC classification number: H02K3/34 ,  B23D45/16 ,  B23D47/12 ,  B27B9/00 ,  H02K1/146 ,  H02K3/325 ,  H02K3/522 ,  H02K11/30 ,  H02K11/33 ,  H02K2213/03

Abstract: An electric power tool is configured to drive a tool bit. The electric power tool includes a motor that includes a stator and a rotor. The stator includes a cylindrical stator core that includes an inner peripheral side with a slot, a first insulator and a second insulator installed on respective both end surfaces of the stator core, and a coil wound around the slot of the stator core via the first insulator and the second insulator. The rotor is rotatable with respect to the stator. The rotor includes a rotor core and a rotation shaft. The first insulator overlaps with the second insulator in the slot in an axial direction of the stator core.