Analysis On The Brake Performance Of Heavy Vehicle Hydraulic Retarder

With the road conditions improved, vehicles are developing towards high-speed and overloaded, which put forward higher requirement for heavy truck brake. As an auxiliary brake, the hydraulic retarder not only has long service life, high braking power and better braking performance, but also plays an important role in improving the reliability of the bake system. With the rapid development of automobile industry in our country, hydraulic retarder applications will have a higher social and economic benefit. So the study on hydraulic retarder is more practical significance.According to the actual project need and the analysis for domestic and foreign research status, the braking performance of bake system is in-depth researched with a production as reference prototype. The brake mathematical model of hydraulic retarder is established based on the beam theory, and the relationship between the brake torque and rotor speed is qualitatively analyzed. Then based on the three-dimensional entity model of the hydraulic retarder, the internal flow field at full-filling condition is simulated and the braking performance is calculated. Meanwhile, bench performance test is taken to test braking performance and validate the simulation results.Based on the simulation results of beam flow, In order to improve the braking performance, the blade structure of hydraulic retarder is improved, and the flow geometry model is built at different title angle. At the same time, the flow law, flow field distribution and braking performance are analyzed and calculated for each model under the full filled condition. By comparing the simulation results of three kinds of blade angle scheme, the relative optimal parameters of blade angle which is got. Compared with the simulation results of original prototype under the same conditions, show that the braking torque of the retarder with the best blade angle is greater than the value of original hydraulic retarder. Indicate that after optimizing the braking performance is obviously improved.