公开(公告)号：US20220263377A1

公开(公告)日：2022-08-18

申请号：US17597455

申请日：2020-07-17

Applicant: MAKITA CORPORATION

Inventor： Yoshinori SASAKI ,  Masayoshi TORIHARA ,  Van Luyen TONG ,  Takahiro KAWAKAMI

IPC: H02K5/16 ,  H02K7/116 ,  B24B23/02 ,  H02K7/08 ,  H02K7/14

Abstract: An electric work machine includes: a motor having a stator disposed around a rotor; a stator-holding member, which holds the stator; one or more bearings, which rotatably support(s) the rotor; and one or more bearing-retaining members, which is (are) supported by the stator-holding member in an immovable manner in the radial direction, retain(s) the bearing(s), and is (are) made of a metal. The stator-holding member is made of a material that exhibits a water-absorption coefficient of 1.5 wt % or less at equilibrium in an ambient atmosphere at a temperature of 23° C. and a relative humidity of 50%.

公开(公告)号：US20230302622A1

公开(公告)日：2023-09-28

申请号：US18155843

申请日：2023-01-18

Applicant: MAKITA CORPORATION

Inventor： Yoshinori SASAKI ,  Takao KUROYANAGI

IPC: B25F5/02 ,  H02K7/14 ,  H02K3/52

CPC classification number: B25F5/02 ,  H02K7/145 ,  H02K3/522 ,  H02K9/06

Abstract: An electric work machine reduces noise from the electric work machine. An electric work machine includes a motor including a stator including a stator core and coils, and a rotor including a rotor core and a rotor shaft, an output unit located frontward from the motor and rotatable with a rotational force from the motor, a first support having a first contact surface in contact with a front end face of the stator core, a second support having a second contact surface in contact with a rear end face of the stator core, and a screw connecting the first support and the second support and fastening the stator core to the first support and the second support in a front-rear direction.

公开(公告)号：US20180297186A1

公开(公告)日：2018-10-18

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.

公开(公告)号：US20230339089A1

公开(公告)日：2023-10-26

申请号：US18128838

申请日：2023-03-30

Applicant: MAKITA CORPORATION

Inventor： Yu ETO ,  Yoshinori SASAKI ,  Luyen Van TONG

IPC: B25D17/04 ,  B25F5/00

CPC classification number: B25D17/043 ,  B25F5/006

Abstract: A handle for use with a power tool includes a handle body, a beam and a weight. The handle body includes a mounting part and a grip part. The handle body is configured to be removably secured to a tool body of a power tool. The grip part is formed in an elongated hollow shape. The beam is supported by the handle body in a cantilever manner and extends within the grip part. The weight is supported by the beam.

公开(公告)号：US20220337117A1

公开(公告)日：2022-10-20

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：US20180117728A1

公开(公告)日：2018-05-03

申请号：US15785705

申请日：2017-10-17

Applicant: MAKITA CORPORATION

Inventor： Takahiro KAWAKAMI ,  Yoshinori SASAKI

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

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.