In-wheel motor drive device

Abstract

An in-wheel motor drive assembly is provided of which a reduction mechanism and a bearing supporting a rotor shaft can be reliably lubricated with oil. The assembly includes a motor case (10) defining a motor chamber (17) and a reduction mechanism chamber (18) provided on one side of and isolated from the motor chamber by a partition wall (16). An electric motor (30) is mounted in the motor chamber (17). A planetary gear type reduction mechanism (40) is mounted in the reduction mechanism chamber (18), and is adapted to reduce the rotation of the electric motor (30) and output the reduced rotation to a hub ring (65). The reduction mechanism (40) is lubricated by lubricating oil stored in the reduction mechanism chamber (18). A tapered oil guide surface (21) is formed at the center of the inner surface of the partition wall (16) facing the reduction mechanism chamber (18). The oil guide surface (21) guides lubricating oil splashed up by the rotating reduction mechanism and flowing down along the inner surface of the partition wall (16), onto the rotor shaft (34) of the electric motor (30), thereby lubricating bearings (47) mounted on the rotor shaft (34).

Description

technical field [0001] The present invention relates to an in-wheel motor drive for driving drive wheels of an automobile. Background technique [0002] figure 1 An overview of an in-wheel drive electric vehicle is shown. In this electric vehicle, a motor drive device A using an electric motor as a drive source is accommodated inside each of a pair of left and right rear wheels 1 as drive wheels, and each of the pair of rear wheels 1 is independently driven by the motor drive device A. drive. [0003] The motor drive device A employed in the above-mentioned in-wheel drive type electric vehicle has: an electric motor; a speed reduction mechanism that decelerates the rotation of the motor shaft of the electric motor; and is rotationally driven by an output from the speed reduction mechanism and transmits the rotation of the drive axle from a wheel hub supported on the drive axle to the rear wheels. [0004] In the motor drive device A described above, it is required to red...

AI Technical Summary

Problems solved by technology

At this time, since oil with high viscosity is used for lubricating the speed reduction mechanism, there is a concern that the efficiency of the electric motor will decrease due to the viscous resistance of the oil.

[0009] And since the metal powder generated by the wear of the gear in the reduction mechanism is mixed into the oil, and the electric motor is cooled by the oil mixed with the metal powder, there is a possibility that the metal powder intrudes into the electric motor and has a bad influence on the electric motor. sex

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