| 摘要 |
The drive has a hydraulic motor (10) i.e. constant motor, provided with hydraulic connections (11, 12), where pressure at the respective hydraulic connections of the hydraulic motor is separately adjusted by pressure regulating valves (1, 2) i.e. 3-way valve. The pressure at the respective hydraulic connections is adjusted in a range between working pressure and return pressure. Orifice plates (41, 42) are arranged between the pressure regulating valves and the hydraulic connections of the motor. Pressure drop over the plates is determined for controlling the valves. An independent claim is also included for a working device comprising an undercarriage and an upper carriage. |
