Title:
POWER TOOL
Document Type and Number:
Japanese Patent JP2022128135
Kind Code:
A
Abstract:
To hardly generate sagging in a cam tooth of a torque limiter.SOLUTION: A hammer drill includes: a motor; a driving side sleeve 40 which is rotatable in both of normal and reverse directions by driving the motor; and a driven side sleeve 60 which is provided to face the driving side sleeve 40 in an axial direction. The driven side sleeve 60 is moved in a separation direction from the driving side sleeve 40 with an increase of load in the driven side sleeve 60, so that a torque limiter 72 is formed to release engagement of engaged surfaces 44A, 44B and 66A, 66B of cam teeth 43, 65. In each cam tooth 43, 65 of the driving side sleeve 40 and the driven side sleeve 60, lead angles α, β of the engaged surfaces 44A, 44B and 66A, 66B are formed to be different from each other on a normal rotation side and a reverse rotation side, and transmission torque from the driving side sleeve 40 to the driven side sleeve 60 is equal in normal rotation and reverse rotation.SELECTED DRAWING: Figure 5
Inventors:
MACHIDA YOSHITAKA
IIDA SAI
KUNO TARO
IIDA SAI
KUNO TARO
Application Number:
JP2021026500A
Publication Date:
September 01, 2022
Filing Date:
February 22, 2021
Export Citation:
Assignee:
MAKITA CORP
International Classes:
B25F5/00; B25D16/00; F16D7/04; F16D43/202
Attorney, Agent or Firm:
Ishida Kiki
Kyoichi Ueda
Kyoichi Ueda