Patent ID: 7884511
Filing Date: 2011-02-08
Classification: B60K,F16H,H02K

Abstract:
1. A motor-type power device in which rotation of a rotor shaft of an electric motor is transmitted to a differential gear, comprising: a motor case and a transmission case connected to each other with a partitioning wall interposed therebetween; the electric motor having the rotor shaft; the differential gear having a pair of output shafts; a reduction gear; an electric motor housing chamber that houses said electric motor and is defined by said motor case and said partitioning wall; a transmission housing chamber that houses said reduction gear and said differential gear and is defined by said transmission case and said partitioning wall; and said partitioning wall that separates said electric motor housing chamber and said transmission housing chamber, said partitioning wall comprising an oil communication passage provided in the transmission case and penetrating a lower portion of said partitioning wall communicating between bottom portions of said electric motor housing chamber and said transmission housing chamber, wherein one output shaft of the pair of output shafts of said differential gear is disposed inside said rotor shaft, wherein an opening of said oil communication passage on the transmission housing chamber side is spaced away from said partitioning wall in an axial direction of the rotor shaft, and wherein oil is supplied to said electric motor, said reduction gear, and said differential gear by an oil pump driven by said rotor shaft and provided in said partitioning wall, wherein a suction port of said oil pump communicates with an oil storage chamber at the bottom portion of said transmission housing chamber via an oil suction passage formed in the partitioning wall and a strainer connected to an upstream end of said oil suction passage and provided in the lower portion of the partitioning wall.