公开(公告)号：US20220088762A1

公开(公告)日：2022-03-24

申请号：US17279055

申请日：2019-08-29

Applicant: MAKITA CORPORATION

Inventor： Yasumasa NAKANE ,  Katsumi OKOUCHI

IPC: B25F5/00 ,  F16H55/14

Abstract: A power tool such as a portable cutting machine has less gear noise from, for example, a reduction gear train under no load. The power tool includes a blade, an electric motor including a motor shaft, and a gear train that transmits a rotational output from the electric motor to the blade. The gear train includes a first gear supported on the motor shaft, a countershaft, an intermediate gear meshing with the first gear and supported on the countershaft, a final shaft having a distal end attached to the blade, a final gear meshing with the intermediate gear and supported on the final shaft, and at least one elastic member between the final shaft and the final gear.

公开(公告)号：US20220379452A1

公开(公告)日：2022-12-01

申请号：US17740503

申请日：2022-05-10

Applicant: MAKITA CORPORATION

Inventor： Yasumasa NAKANE ,  Luyen Van TONG

IPC: B25F5/00 ,  B24B23/04 ,  B25F5/02 ,  B25F1/02 ,  B25F3/00 ,  B26B7/00

Abstract: A power tool has a motor having a rotary shaft, an eccentric shaft configured to be rotated around a rotation center axis of the rotary shaft, and a balancer configured to rotate with the rotary shaft. When viewed along the rotation center axis, (1) a first imaginary line passes the rotation center axis and an eccentric axis, (2) an imaginary perpendicular line crosses perpendicularly to the first imaginary line and passes the rotation center axis, (3) a center of gravity of the balancer is located in a region on a side opposite to the eccentric axis across the imaginary perpendicular line; and (4) a second imaginary line passes the rotation center axis and the center of gravity of the balancer and (5) the second imaginary is inclined at an inclination angle larger than 0° and smaller than 90° in a direction opposite to a rotating direction of the rotary shaft.