HYDROSTATIC DRIVE FOR A SLEWING GEAR, SLEWING GEAR HAVING SUCH A DRIVE, AND MOBILE WORKING MACHINE HAVING SUCH A SLEWING GEAR

摘要

The present invention relates to an oil hydraulic drive unit for a rotary gear and, more particularly, for a rotary gear of a mobile working machine. The oil hydraulic drive unit includes a first hydraulic machine capable of being connected with the rotary gear and receiving a pressure medium through one side of a hydraulic valve unit of the drive unit in a normal mode. For a regenerative mode of the rotary gear, the drive unit includes a hydraulic reservoir and the other side of the hydraulic valve unit separately provided for the same. The hydraulic reservoir can be filled with a pressure medium from the first hydraulic machine for the rotation of the rotary gear and/or the storage of braking energy through the other side of the hydraulic valve unit. The first hydraulic machine is able to receive the pressure medium from the hydraulic reservoir for the regeneration of the stored pressure medium energy. The present invention also relates to the mobile working machine and the rotary gear including the above drive unit.