Hydraulic steering device
A hydraulic steering device (1) is provided, said steering device (1) comprising a supply port arrangement having a pressure port (P) and a tank port (T), a working port arrangement having two working ports (L, R), a main flow path (8) between the pressure port (P) and the working port arrangement,...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A hydraulic steering device (1) is provided, said steering device (1) comprising a supply port arrangement having a pressure port (P) and a tank port (T), a working port arrangement having two working ports (L, R), a main flow path (8) between the pressure port (P) and the working port arrangement, a return flow path (10) between the working port arrangement and the tank port (T), a variable main orifice (A1) and a flow meter (9) being arranged in said main flow path (8), said main orifice (A1) being closed in a neutral position and open in a steering mode, an amplification flow path (11) being arranged in parallel to the main flow path (8), said amplification flow path (11) including a variable amplification orifice (AU) and being connected to said main flow path (8) downstream said flow meter (9) in a direction from said pressure port (P) to said working port arrangement, said variable amplification orifice (AU) being closed in said neutral position and open in said steering mode. Such steering device should be operated with enhanced reliability. To this end, an auxiliary orifice (AUd) is arranged in parallel to the variable amplification orifice (AU) and a drain orifice (AUdr) is arranged between said amplification flow path (11) and the tank port (T), said auxiliary orifice (AUd) and said drain orifices (AUdr) being open in said neutral position. |
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