The invention discloses a double-acting hydraulic
retarder which comprises a shell, a
control system, a
heat exchanger, an
oil tank and a control valve. The
heat exchanger is communicated with the shell, an
impeller and a high-pressure oil
injection device are arranged in an inner cavity of the shell,
oil can be injected to the
impeller by the high-pressure oil
injection device during high-speed
brake, the inner cavity of the shell is divided into a vacuum working cavity and an
oil storage cavity by the high-pressure oil
injection device, the
impeller can work in the vacuum working cavity, the
oil storage cavity is used for storing the high-
pressure injection oil, an oil passage is arranged on the shell, the vacuum working cavity is communicated with the
oil storage cavity via the oil passage, a low-speed
brake oil outlet and a high-speed
brake oil outlet are further formed in the shell, the low-speed brake oil outlet is communicated with the oil storage cavity, the high-speed brake oil outlet is communicated with the vacuum working cavity, and both the low-speed brake oil outlet and the high-speed brake oil outlet are communicated with the
heat exchanger in a opening and closing manner; the control valve is arranged on the outside of the shell, and the high-pressure oil injection device works under the control of the control valve during high-speed brake. The double-acting hydraulic
retarder has the advantages that a vehicle is braked by the aid of a working principle of a pump when the vehicle runs at a high speed and a
low speed respectively, so that braking force can be relatively increased when the vehicle runs at the
low speed, high braking force can be kept when the vehicle runs at the high speed, and the double-acting hydraulic
retarder is high in braking efficiency.