Invention Grant
- Patent Title: Electric motor
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Application No.: US14969124Application Date: 2015-12-15
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Publication No.: US10014743B2Publication Date: 2018-07-03
- Inventor: Seiji Saiki , Kazushige Koiwai
- Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
- Applicant Address: JP Hiroshima-shi
- Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
- Current Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
- Current Assignee Address: JP Hiroshima-shi
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2015-012190 20150126
- Main IPC: H02K5/16
- IPC: H02K5/16 ; H02K5/173 ; H02K7/08

Abstract:
Provided is an electric motor capable of stabilizing a preload applied to a bearing by an annular spring and effectively retarding degradation of the annular spring. The electric motor includes a motor shaft, a rotor, a stator, a housing containing the rotor and the stator in a posture where the motor shaft extends vertically, an upper bearing and a lower bearing supporting the motor shaft, and an annular spring applying a downward preload to the upper bearing. The lower bearing is fixed to the motor shaft and the housing. The housing has a load-receiving surface receiving an upward thrust load overcoming the preload from the upper bearing.
Public/Granted literature
- US20160218582A1 ELECTRIC MOTOR Public/Granted day:2016-07-28
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