Hydraulic steering arrangement
A hydraulic steering arrangement ( 1 ) is provided comprising a static steering unit ( 2 ) and an adjustable pressure source ( 3 ) connected to a pressure port ( 4 ) of said steering unit ( 2 ) and having a load sensing port ( 21 ). Such a steering unit should enable a fast reaction of the steering unit. To this end said pressure source ( 3 ) is a dynamic pressure source having an orifice (Adyn) outputting hydraulic fluid to said load sensing port ( 21 ), a load sensing line ( 22 ) connecting said load sensing port ( 21 ) and a low pressure port ( 11 ), a control valve ( 24 ) being arranged in said load sensing line ( 22 ) between said load sensing port ( 21 ) and said low pressure port ( 11 ), said control valve ( 24 ) being actuated by a control pressure within said steering unit ( 2 ) and throttling a flow through said load sensing line ( 22 ) depending on said control pressure.
1. A hydraulic steering arrangement comprising:
a steering unit including a pressure port;
an adjustable pressure source connected to the pressure port of said steering unit, the adjustable pressure source including a load sensing port;
wherein said pressure source is a dynamic pressure source having an orifice outputting hydraulic fluid to said load sensing port;
a load sensing line connecting said load sensing port and a low pressure port; and
a control valve arranged in said load sensing line between said load sensing port and said low pressure port, said control valve being actuated by a control pressure within said steering unit and throttling a flow through said load sensing line depending on said control pressure,
wherein said steering unit comprises:
a supply port arrangement having a pressure port and a return port;
a working port arrangement having two working ports;
a main flow path between said pressure port and said working port arrangement;
a return flow path between said working port arrangement and said return port; and
a main orifice and a flow meter arranged in said main flow path;
wherein said main orifice opens upon actuation of a wheel;
wherein said control pressure is a pressure downstream said main orifice; and
wherein said control pressure is a pressure between said main orifice and said flow meter.
2. The steering arrangement according to claim 1 , wherein said pressure source comprises a dynamic priority valve.
3. The steering arrangement according to claim 1 , wherein an amplification flow path is arranged in parallel to a section of said main flow path, said section comprising said main orifice and said flow meter.
4. The steering arrangement according to claim 3 , wherein a safety valve is arranged in said amplification flow path, said safety valve being loaded in closing direction by said control pressure.
5. The steering arrangement according to claim 2 , wherein an amplification flow path is arranged in parallel to a section of said main flow path, said section comprising said main orifice and said flow meter.
6. A hydraulic steering arrangement comprising:
a steering unit including a pressure port;
an adjustable pressure source connected to the pressure port of said steering unit, the adjustable pressure source including a load sensing port;
wherein said pressure source is a dynamic pressure source having an orifice outputting hydraulic fluid to said load sensing port;
a load sensing line connecting said load sensing port and a low pressure port; and
a control valve arranged in said load sensing line between said load sensing port and said low pressure port, said control valve being actuated by a control pressure within said steering unit and throttling a flow through said load sensing line depending on said control pressure;
wherein said pressure source comprises a dynamic priority valve.
7. The steering arrangement according to claim 6 , wherein said steering unit comprises:
a supply port arrangement having a pressure port and a return port;
a working port arrangement having two working ports;
a main flow path between said pressure port and said working port arrangement;
a return flow path between said working port arrangement and said return port; and
a main orifice and a flow meter arranged in said main flow path;
wherein said main orifice opens upon actuation of a steering wheel; and
wherein said control pressure is a pressure downstream said main orifice.
8. The steering arrangement according to claim 7 , wherein said control pressure is a pressure between said main orifice and said flow meter.
9. The steering arrangement according to claim 7 , wherein an amplification flow path is arranged in parallel to a section of said main flow path, said section comprising said main orifice and said flow meter.
10. The steering arrangement according to claim 6 , wherein an amplification flow path is arranged in parallel to a section of said main flow path, said section comprising said main orifice and said flow meter.
11. The steering arrangement according to claim 10 , wherein a safety valve is arranged in said amplification flow path, said safety valve being loaded in closing direction by said control pressure.
12. A hydraulic steering arrangement comprising:
a steering unit including a pressure port;
an adjustable pressure source connected to the pressure port of said steering unit, the adjustable pressure source including a load sensing port;
wherein said pressure source is a dynamic pressure source having an orifice outputting hydraulic fluid to said load sensing port;
a load sensing line connecting said load sensing port and a low pressure port; and
a control valve arranged in said load sensing line between said load sensing port and said low pressure port, said control valve being actuated by a control pressure within said steering unit and throttling a flow through said load sensing line depending on said control pressure;
wherein an amplification flow path is arranged in parallel to a section of said main flow path, said section comprising said main orifice and said flow meter; and
wherein a safety valve is arranged in said amplification flow path, said safety valve being loaded in closing direction by said control pressure.
13. The steering arrangement according to claim 12 , wherein said steering unit comprises:
a supply port arrangement having a pressure port and a return port;
a working port arrangement having two working ports;
a main flow path between said pressure port and said working port arrangement;
a return flow path between said working port arrangement and said return port; and
a main orifice and a flow meter arranged in said main flow path;
wherein said main orifice opens upon actuation of a steering wheel; and
wherein said control pressure is a pressure downstream said main orifice.
14. The steering arrangement according to claim 13 , wherein said control pressure is a pressure between said main orifice and said flow meter.
15. The steering arrangement according to claim 13 , wherein said pressure source comprises a dynamic priority valve.
16. The steering arrangement according to claim 13 , wherein said control pressure is a pressure between said main orifice and said flow meter; and
wherein said pressure source comprises a dynamic priority valve.
17. The steering arrangement according to claim 12 , wherein said pressure source comprises a dynamic priority valve.