US 12,226,887 B2
Power tool
Masatoshi Fukinuki, Nanjing (CN); Guoming Tong, Nanjing (CN); Rui Zhan, Nanjing (CN); Xiang Zhao, Nanjing (CN); and Pengpeng Xue, Nanjing (CN)
Assigned to Nanjing Chervon Industry Co., Ltd., Nanjing (CN)
Filed by Nanjing Chervon Industry Co., Ltd., Nanjing (CN)
Filed on Mar. 1, 2023, as Appl. No. 18/176,896.
Application 18/176,896 is a continuation of application No. PCT/CN2021/116624, filed on Sep. 6, 2021.
Claims priority of application No. 202010922861.0 (CN), filed on Sep. 4, 2020; application No. 202011425115.7 (CN), filed on Dec. 9, 2020; application No. 202110982603.6 (CN), filed on Aug. 25, 2021; and application No. 202122021246.5 (CN), filed on Aug. 25, 2021.
Prior Publication US 2023/0202020 A1, Jun. 29, 2023
Int. Cl. B25F 5/00 (2006.01); H02K 5/20 (2006.01); H02K 5/22 (2006.01); H02K 7/14 (2006.01); H02K 9/06 (2006.01); B25F 3/00 (2006.01)
CPC B25F 5/008 (2013.01) [H02K 5/207 (2021.01); H02K 5/225 (2013.01); H02K 7/145 (2013.01); H02K 9/06 (2013.01); B25F 3/00 (2013.01); B25F 5/006 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A power tool, comprising:
a housing;
a power mechanism comprising a rotatable drive shaft;
an oscillating mechanism for generating oscillations;
an output mechanism drivingly connected to the oscillating mechanism;
an airflow element connected to the drive shaft and driven by the drive shaft to rotate to generate an airflow;
a heat conducting portion supported on the drive shaft, wherein the airflow element is disposed on an outer circumference of the heat conducting portion;
an air inlet disposed on the housing and allowing the airflow to enter; and
an air outlet disposed on the housing and downstream of the air inlet and allowing the airflow to flow out;
wherein the oscillating mechanism comprises:
a support assembly sleeved on the drive shaft; and
an oscillating member driven by the support assembly to oscillate; and
wherein heat generated by the oscillating mechanism is conducted to the heat conducting portion through the drive shaft, the heat conducting portion has a thermal conductivity greater than or equal to 50 W/m·° C., a portion of the heat conducting portion in contact with the drive shaft has an axial distance L1, a thermally conductive portion of the drive shaft between the heat conducting portion and the support assembly has a distance L2, and a ratio of the axial distance L1 to the distance L2 is greater than or equal to 0.1 and less than or equal to 5,
further comprising an oil storage unit used for storing a lubricating medium and disposed on at least one of the drive shaft or the support assembly, wherein the support assembly comprises a support bracket and rolling members, and oil grooves penetrating through a circumferential surface of the support bracket are provided on the support bracket.