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1. (WO2017173884) POWER TOOL GEARBOX TRANSMISSION STRUCTURE

Pub. No.:    WO/2017/173884    International Application No.:    PCT/CN2017/073452
Publication Date: Fri Oct 13 01:59:59 CEST 2017 International Filing Date: Wed Feb 15 00:59:59 CET 2017
IPC: F16H 3/70
Applicants: WANG, Qiang
王强
Inventors: WANG, Qiang
王强
JEN, Hsi-jen
任溪仁
CHIU, Yi-tung
邱奕栋
Title: POWER TOOL GEARBOX TRANSMISSION STRUCTURE
Abstract:
A power tool gearbox transmission structure comprises a first planetary gear assembly (1) and a second planetary gear assembly (2) coaxially disposed in sequence. A transmission ring gear (3) capable of moving axially is disposed between the first planetary gear assembly (1) and the second planetary gear assembly (2). An inner edge of the transmission ring gear (3) is provided with inner teeth meshing with the first planetary gear of the first planetary gear assembly (1). An end of an outer circumference of the transmission ring gear (3) opposite an inner gear (21) of the second planetary gear assembly (2) is provided with outer clutch teeth (31). An inner edge of an end of the inner gear (21) opposite the transmission ring gear (3) is provided with inner clutch teeth (211). The outer clutch teeth (31) mesh with the inner clutch teeth (211). Since the present invention eliminates the need for a lock washer, direct clutching between the transmission ring gear (3) and the inner gear (21) of the second planetary gear assembly (2) is enabled, simplifying both the structure and assembly, avoiding prior art issues such as lock washers loosening due to impact, improving clutch reliability, and extending the service life of power tools.