HYDRAULIC STEERING DEVICE

摘要

A hydraulic steering device is provided comprising a supply port arrangement having a pressure port (P) and a tank port (5), a working port arrangement having two working ports (L, R), a main flow path (14) between the pressure port (P) and the working port arrangement, a return flow path (16) between the working port arrangement and the tank port (5), flow meter means (15) being arranged in said main flow path (14), an amplification flow path (17) being arranged in parallel to said main flow path (14), said amplification flow path (17) being connected to said main flow path (14) downstream said flow meter means (15) in a direction from said pressure port (P) to said working port arrangement. A risk of dangerous situations in case of jamming of the flow meter should be reduced. To this end pressure increasing means are provided increasing a pressure over said flow meter means (15) in case a flow through said main flow path (14) is blocked by said flow meter (15).

主权项

1. A hydraulic steering device comprising a supply port arrangement having a pressure port (P) and a tank port, a working port arrangement having two working ports (L, R), a main flow path between the pressure port (P) and the working port arrangement, a return flow path between the working port arrangement and the tank port, flow meter means being arranged in said main flow path, an amplification flow path being arranged in parallel to said main flow path, said amplification flow path being connected to said main flow path downstream said flow meter means in a direction from said pressure port (P) to said working port arrangement, wherein pressure increasing means are provided increasing a pressure over said flow meter means in case that a flow through said main flow path is blocked by said flow meter means.