| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accomplish reduction in the cost of a motor cooling structure so constructed as to enhance cooling efficiency. <P>SOLUTION: A lubricating oil passage 51 for supplying lubricating oil to a journal bore 41 is formed in a cylinder block 40. A cooling oil chamber 75 is formed in a holder 68 that forms a rotor 23, and a cooling oil passage 76 that connects the lubricating oil passage 51 and the cooling oil chamber 75 is formed in a crank shaft 20 and the holder 68. Thus, part of the lubricating oil supplied toward a crank journal 43 can be distributed to the cooling oil chamber 75, and the rotor 23 can be directly cooled using the lubricating oil. Therefore, the efficiency of cooling a motor-generator 18 can be enhanced. The oil-cooled motor-generator 18 can be coupled with a conventional engine just by additionally machining the crank shaft 20 to form the cooling oil passage 76 there. Thus, reduction in the cost of the motor cooling structure can be accomplished. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
