Electric motorized wheel with integral motorized cooling oil pump

Abstract

An electric motor equipped with a cooling apparatus in which an oil reservoir (2b) filled with a cooling oil is provided in the lower portion of a casing (1). Provided in the casing is at least a portion of an oil passageway (2f, 4c, 28) which communicates with the oil reservoir (2b) and which opens within the casing (1) above and below a coil (6d) of the motor. The oil casing is internally provided with an oil pump (27) which causes the cooling oil to flow through the oil passageway (2f, 4c, 28). Accordingly, the cooling apparatus, which comprises the oil reservoir (2b), at least a portion of the oil passageway (2f, 4c, 28) and the oil pump (27), is provided within the casing (1) of the electric motor and integrated therewith. As a result, the electric motor is made more compact overall despite the provision of the cooling apparatus. Since the coil (6d) of the motor is positively cooled by the cooling apparatus, a large current can be passed through the coil. This enables the electric motor to generate a high output torque.

Dependencies are inferred from the claim text.