Title:
電動機
Document Type and Number:
Japanese Patent JP6481382
Kind Code:
B2
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 (11), a rotor (12), a stator (13), a housing (14) containing the rotor (12) and the stator (13) in a posture where the motor shaft (11) extends vertically, an upper bearing (17) and a lower bearing (18) supporting the motor shaft (11), and an annular spring (21) applying a downward preload to the upper bearing (17). The lower bearing (18) is fixed to the motor shaft (11) and the housing (14). The housing (14) has a load-receiving surface (22) receiving an upward thrust load overcoming the preload from the upper bearing (17).
Inventors:
Seiji Saeki
Kazushige Koiwai
Kazushige Koiwai
Application Number:
JP2015012190A
Publication Date:
March 13, 2019
Filing Date:
January 26, 2015
Export Citation:
Assignee:
Kobelco Construction Machinery Co., Ltd.
International Classes:
H02K5/173; F16C25/08; F16C35/077
Domestic Patent References:
| JP2013070510A | ||||
| JP59164473U | ||||
| JP2005080339A |
Foreign References:
| US20070273229 | ||||
| US20090091201 |
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Muramatsu Toshiro
Masataka Otani
Muramatsu Toshiro
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