The invention discloses a sequentially controlled twin steering pump, which comprises a main pump, an auxiliary pump, an intermediate and a pump shaft. The main pump includes a flow control valve I, a
safety valve I, a flow control damping hole I, a
pressure control damping hole, a
check valve I, a pump body, a pressure side plate I, a blade I, a rotor I, a
stator I, and a flow control valve spring. The auxiliary pump consists of a
safety valve II, a
reversing valve, a
check valve II, a flow control damping hole II, a blade II, a rotor II, a
stator II, a pressure side plate II, a pump cover I, and a
reversing valve spring. An annular oil suction chamber of the main pump is communicated with an oil inlet and is also communicated with an annular oil suction chamber of the auxiliary pump through an intermediate oil suction window, so that the oil inlet can deliver an oil medium simultaneously to the main pump and the auxiliary pump. The pump of the invention improves steering security, prolongs service life, reduces
energy consumption, enhances reliability and lowers steering oil medium consumption. In the pump of the invention, even if the main pump breaks down, the auxiliary pump can substitute automatically, and realizes the function of emergency
oil supply.