Double-acting hydraulic retarder

Abstract

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.

Description

technical field [0001] The invention relates to the retarder field, in particular to a double-acting hydraulic retarder which can brake separately when the automobile runs at high speed and low speed. Background technique [0002] Automobile braking system is one of the most important systems in the safe driving of automobiles. With the development of engine technology and the improvement of road conditions, the driving speed and single running interval of the car have been greatly developed, and the driving kinetic energy has been greatly improved, which makes the traditional friction plate brake device more and more unable to adapt Long-term, high-intensity work needs. Due to the frequent or long-term use of the service brake, the phenomenon of thermal degradation of the brake performance due to overheating of the friction plate will occur, and in severe cases, the brake will fail, threatening the safety of driving. Vehicles also increase transportation costs due to freq...

AI Technical Summary

Problems solved by technology

[0003] Existing hydraulic retarders usually use a single braking control method, that is, the rotor drives the blades to rotate, the blades throw the oil to the stator, and the stator generates a resistance torque to form a reaction force on the blades to achieve the purpose of braking. The dynamic control method does not distinguish the driving speed of the car body. When driving at high speed and low speed, the braking is achieved through this braking method. The braking response is not sensitive enough, and it is easy to cause the oil to generate high power output in the case of low and high speed mixing. oil phenomenon, which greatly increases the amount of oil circulation; and the existing hydraulic retarder realizes the process of hydraulically injecting oil into the rotor of the traditional retarder by setting the compressed air proportional regulating valve, which requires a long response time , the process of controlling the oil is more complicated, and the response speed is not ideal, which results in a longer execution time of the retarder, which affects the braking efficiency of the retarder; in addition, the existing hydraulic retarder is mostly connected with the transmission in parallel transmission , not only the transmission effect is not good, but also there is easy pumping loss when the retarder is idling, resulting in low transmission power, and the parallel transmission often makes the transmission of the transmission shaft and the retarder unable to be synchronized, and the retarder takes a long time response time, so that the vehicle speed cannot be braked in time, and even accidents may occur in severe cases.

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