Motor, wet type brake and wet type clutch

Abstract

To provide a motor, a wet type brake, or a wet type clutch in which liquid coolant is sealed and viscous resistance in a gap between a casing and a rotor is reduced. Provided is a motor (10) which includes a casing (60), and a rotor shaft (70) which rotates relative to the casing (60), in which liquid coolant is sealed in the casing (60), and a concave portion (62) is formed on a facing surface (60B) of the casing (60), which faces a rotor (66).

Description

[0001] This application claims priority based on Japanese Patent Application No. 2013-169609 filed on August 19, 2013. The entire contents of this Japanese application are incorporated herein by reference. technical field [0002] The invention relates to a motor, a wet brake and a wet clutch. Background technique [0003] There is known an oil-bath motor in which a motor and a reduction gear are sealed in a space communicating with each other, and lubricating oil is circulated in the space. For example, Patent Document 1 discloses a rotating electric machine in which the rotating shaft of the motor is hollow, and oil-containing refrigerant is sprayed from an external cooling fluid supply unit through a hole in the rotating shaft to a rotor housing space in the housing. [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 11-41861 [0005] If the gap between the housing and the end surface of the rotor is reduced for axial compactness, then the viscous res...

AI Technical Summary

Problems solved by technology

[0005] If the gap between the casing and the rotor end surface is reduced for axial compactness, then the motor encapsulated with coolant has the problem that the viscous resistance on the gap increases when the rotor rotates, resulting in a decrease in motor efficiency.

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