| 摘要 |
PROBLEM TO BE SOLVED: To lubricate the rotor bearings 110, 111 of a motor, used in an electrically driven unit consisting of a motor 1 and a power transmission device 2 coupled to one end of the rotor shaft 11 of the motor, with lubricating oil in the casing 20 of the power transmission device. SOLUTION: A lubricating path 11a guiding the lubricating oil in the casing 20 is formed in the rotor shaft 11. An oil seal 110a located on the axially inner side of the rotor bearing 110 is fitted into the mounting hole 101a for bearing of an end wall 101 at one end of a motor housing 10 and the lubricating path 11a is communicated with a clearance between the rotor bearing 110 and the oil seal 110a. A pair of oil seals 111a, 111b located on axially both sides of the rotor bearing 111 is fitted into the mounting hole 102a made-for-bearing of an end wall 102 at the other end of the motor housing 10 and a clearance on one side of clearances on axially both sides of the rotor bearing 111 formed between it and both the oil seals 111a, 111b communicates with the lubricating path 11a as well as a clearance on the other side communicates with the casing 20 through the lubricating path 102b formed at the end wall 102 and the lubricating path 100b formed at the peripheral wall 100 of the motor housing 10.
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