Motor-hydraulic machine unit for attachment to a hydraulic assembly

A motor-hydraulic machine unit, comprising:

• an electric motor;
• a hydraulic machine;
• and
• a connection body having a planar connection surface that delimits a first working connection and a second working connection, the first and second working connections are each in fluid exchange connection with the hydraulic machine via a respective one of two first fluid ducts in the connection body,
• wherein:
• the electric motor and the hydraulic machine (i) have a common axis of rotation that is arranged substantially parallel to the connection surface and (ii) are arranged on opposite sides of the connection body in a direction of the axis of rotation,
• the connection body is traversed by a drive aperture in the direction of the axis of rotation,
• the electric motor and the hydraulic machine are in rotary drive connection in a region of the drive aperture,
• the hydraulic machine comprises a cylinder drum having a plurality of cylinder bores in each of which a piston is received in a linearly movable manner,
• the cylinder drum bears rotatably against a control surface which has a first control kidney connected to a first one of the two first fluid ducts and a second control kidney connected to a second one of the two first fluid ducts,
• at least one separate precompression cavity, which is connected exclusively via a fourth fluid duct to the cylinder bores, is arranged within the connection body, and is closed fluid-tightly, and
• the fourth fluid duct opens out on the control surface in the circumferential direction between the first and second control kidneys.