-
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
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
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
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
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.
-
-
-