公开(公告)号：US11476735B2

公开(公告)日：2022-10-18

申请号：US16834414

申请日：2020-03-30

Applicant: MAKITA CORPORATION

Inventor： Yoshinori Sasaki

IPC: H02K7/14 ,  H02K1/276 ,  H02K1/18 ,  H02K9/06 ,  H02K9/22 ,  B25F5/02 ,  H02K1/30

Abstract: An electric work machine with a product structure that effectively reduces noise caused by a brushless motor without changing the motor specifications. A hammer drill includes a brushless motor including a stator including an insulator, a cylindrical stator core, and a coil wound around the stator core via the insulator, and a rotor rotatable relative to the stator, a cylindrical member fixed along an entire outer circumference of the stator core and made of material with a Young's modulus higher than a Young's modulus of the insulator, and a housing accommodating the brushless motor and the cylindrical member.

公开(公告)号：US10513005B2

公开(公告)日：2019-12-24

申请号：US15785705

申请日：2017-10-17

Applicant: MAKITA CORPORATION

Inventor： Takahiro Kawakami ,  Yoshinori Sasaki

IPC: B24B23/02 ,  B24B47/12 ,  B25F5/02 ,  B25F5/00

Abstract: A power tool, such as a grinder, includes a motor housing that houses a motor. A grip housing extends in a longitudinal direction of the power tool and has a first longitudinal end coupled to the motor housing, first and second battery-mount parts formed at a second longitudinal end, and a grip part disposed between the first and second longitudinal ends. First and second battery packs are respectively mountable on the first and second battery-mount parts, and the grip housing comprises an upper housing half joined to a lower housing half.

公开(公告)号：US12273002B2

公开(公告)日：2025-04-08

申请号：US17658322

申请日：2022-04-07

Applicant: MAKITA CORPORATION

Inventor： Yoshinori Sasaki ,  Yoshihiro Kimura

IPC: H02K5/02 ,  H02K1/16 ,  H02K1/27 ,  H02K7/00 ,  H02K7/14 ,  H02K9/06

Abstract: An electric work machine (1; 201) includes: a motor housing (6; 212) having a tube part (6C; 212C) and a bottom part (6M; 212M); a brushless motor (5; 228) having a stator (20), which has a first contact surface (58F; 258F), and a rotor (21; 231) disposed in the stator; a baffle plate (25; 285); and an output shaft (31; 292). The stator includes a tube-shaped stator core (50) having a ring-shaped second contact surface (50S; 250S) that is opposite of the first contact surface, and coils (56; 256) wound on the stator core. The stator is held by the motor housing with the first contact surface in contact with the bottom part. A protruding part (25S; 285S) of the baffle plate contacts the entire circumference of the second contact surface of the stator core and is fixed to the motor housing by three or more screws (68; 288).

公开(公告)号：US10913141B2

公开(公告)日：2021-02-09

申请号：US15946029

申请日：2018-04-05

Applicant: MAKITA CORPORATION

Inventor： Hitoshi Iida ,  Masanori Furusawa ,  Hirokatsu Yamamoto ,  Ryo Umemoto ,  Yoshinori Sasaki ,  Akira Naito

IPC: B25D17/24 ,  B25D16/00 ,  B25D17/04

Abstract: An impact tool includes a motor, a driving mechanism, and a vibration sensor. The driving mechanism is configured to perform a hammering operation of linearly driving a tool accessory along an impact-axis by power of the motor. The impact-axis extends in a front-rear direction of the impact tool. The vibration sensor is configured to detect vibrations. The vibration sensor is disposed such that the vibration sensor is capable of detecting vibrations of a first frequency among vibrations caused in the impact tool, and such that transmission of vibrations of a second frequency to the vibration sensor is suppressed. The vibrations of the first frequency result from the hammering operation. The second frequency is different from the first frequency.