| 摘要 |
PURPOSE:To lighten the steering force and reduce the handle operation angle by arranging a load sensing value switching in response to the oil pressure of a main booster on a pipeline connecting the main booster and an auxiliary booster. CONSTITUTION:When the oil pressure of main booster 11 is low, a main booster port is closed in a load sensing valve 20, an auxiliary booster port is communicated to a tank port, and only the main booster 11 is driven. When the oil pressure of the main booster 11 is increased, the main booster port is communicated to the auxiliary booster port in the load sensing valve 20, and an auxiliary booster 12 is driven interlockingly with the main booster 11. Accordingly, the steering force of the main booster 11 is supplemented, and the gear ratio of a steering gear box 24 can be set small. In addition, the handle operation angle is reduced to suppress wheel from becoming oversensitive. |
