CONSTRUCTION MACHINE

摘要

Provided is a construction machine which is capable of suppressing useless power consumption. This construction machine is provided with an excavator body (2), a working device (30) which is attached to the excavator body (2), an engine (22) which is mounted in the excavator body (2), a generator motor (23) which is attached to the engine (22) and which can be driven as an electric generator or an electric motor, a hydraulic pump (41) which is driven by the engine (22) and the generator motor (23), a hydraulic actuator (32) which drives the working device (30) with motive power generated by the hydraulic pump (41), and a control portion (80) which lowers the drive output of the generator motor (23) in accordance with the drive state of the working device (30) and limits the drive output of the hydraulic pump (41) in order to keep the rotation frequency of the engine (22) within a range of predetermined values.

主权项

1. A construction machine comprising:
a body; a drive portion which is attached to the body; an engine which is mounted in the body; a generator motor which is attached to the engine and which can be driven as an electric generator or an electric motor; a hydraulic pump which is driven by the engine and the generator motor; a plurality of hydraulic actuators which drive the drive portion with motive power generated by the hydraulic pump; a pressure control device which operates in accordance with discharge pressure of the hydraulic pump; a pressure detection portion which detects the discharge pressure of the hydraulic pump; a plurality of operation devices which generate and output operation signals in order to operate the plurality of hydraulic actuators and a control portion which lowers a drive output of the generator motor in accordance with a drive state of the drive portion and limits a drive output of the hydraulic pump in order to keep the rotation frequency of the engine within a range of predetermined values.