| 摘要 |
A hydrostatic steering device has two steering systems (1, 2), each having a pump (5, 13), a steering unit (3, 11) and a steering motor (10, 16). A steering wheel (20) is common for both steering units (3, 11). The device comprises a change-over valve (24) which, in an operation position (A), creates a hydraulic connection of the motor hoses (14, 15) of the second steering system (2), and in an emergency position (B), the motor hoses (8, 9) of the first steering system, and a switching device (25) reacting on the occurrence of a fault in the first steering system (1) and switching the change-over valve (24) from the operation position (A) to the emergency position (B). This enables a steering operation, also on failure of the first steering system, for the operation of the steering wheel, however, only a relatively small torque is required.
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