| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power unit for a construction machine of which energy efficiency is high. <P>SOLUTION: The power unit for the construction machine provided with an actuator for the work machine system, an actuator for the travelling system and a first pump P1 and a second pump P2 for selectively supplying hydraulic fluid to the actuator for the work machine system or the travelling system includes a variable capacity type regeneration motor M1 for connecting with a passage 30 which becomes a return side when inertia energy and potential energy work on the actuator of the work machine system, a variable capacity type auxiliary pump P3 for rotating integrally with the regeneration motor and merging the hydraulic fluid to one or both of the first pump and the second pump, a generator motor M for rotating integrally with the regeneration motor and the auxiliary pump and a power storage unit U for storing electric power generated by the generator motor. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
