US 11,813,729 B2
Power tool with partition assembly between transmission and motor
Brent Austin Kuehne, Red Lion, PA (US); Gao Jian, Jiangsu (CN); Wang Guoqing, Jiangsu (CN); Zhang Yukun, Jiangsu (CN); Chen Jianhua, Jiangsu (CN); Zhu Wen, Jiangsu (CN); Wu Yanmin, Jiangsu (CN); Lu Xiaoli, Jiangsu (CN); Colin Crosby, White Marsh, MD (US); Lynn Weikel, Baltimore, MD (US); Tong Zheng, Jiangsu (CN); and Xiaolie Niu, Suzhou (CN)
Assigned to BLACK & DECKER INC., New Britain, CT (US)
Filed by Black & Decker Inc., New Britain, CT (US)
Filed on Dec. 22, 2020, as Appl. No. 17/130,497.
Application 17/130,497 is a continuation in part of application No. 15/978,258, filed on May 14, 2018, granted, now 10,971,966.
Prior Publication US 2021/0107131 A1, Apr. 15, 2021
Int. Cl. H02K 5/10 (2006.01); H02K 7/116 (2006.01); H02K 5/124 (2006.01); H02K 7/14 (2006.01); B25F 5/02 (2006.01); F16J 15/447 (2006.01)
CPC B25F 5/02 (2013.01) [F16J 15/447 (2013.01); H02K 5/10 (2013.01); H02K 7/145 (2013.01); H02K 5/124 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power tool comprising:
a housing;
a motor assembly received in the housing having a rear end portion, a front end portion, and a motor output shaft;
a transmission assembly received in the housing to which the motor output shaft is drivingly coupled; and
a partition assembly including a rear cover covering a rear end portion of the transmission assembly that faces the front end portion of the motor assembly with a central opening that receives the motor output shaft and a seal received in the central opening,
wherein at least one of the rear cover and the front end portion of the motor assembly define a first labyrinth path therebetween and the seal defining a second labyrinth path in the central opening, the first and second labyrinth paths configured to inhibit grease or debris migration between the transmission assembly and the motor assembly,
wherein the rear cover includes a rearward projection and the motor assembly includes a recess that receives the rearward projection, with the first labyrinth path defined by the rearward projection and the recess,
wherein the rearward projection comprises at least one of an L-shaped and a J-shaped projection having a first portion that extends axially rearward from the rear cover and a second portion that extends radially inward from the first portion.