| DESIGN AND BRAKING STABILITY ANALYSIS OF A NOVEL INTERNAL PUMP-HYDRAULIC RETARDER AXLE FOR HEAVY ARTICULATED VEHICLE
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| Zhiwei Gao 1, Desheng Li 1, Zongqiang Liu 2, Lezhi Ye 1 |
1Beijing University of Technology
2Technology Center, Qingte Group Co., Ltd. |
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| ABSTRACT |
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The retarder is widely used to ensure braking safety in heavy vehicles due to its noncontact braking
characteristics. Currently, retarders are generally mounted on tractors, but semi-trailers have greater inertia and are prone to
accidents. Therefore, the semi-trailer’s brakes have to work frequently to maintain stability during downhill braking, which
causes the brakes to generate high temperatures or even failure. Based on the above problems, a novel internal
pump-hydraulic retarder axle (IP-HRA) is proposed, which integrates the pump and hydraulic retarder (HR) into the support
axle. The prototype of the IP-HRA was made and a bench test was conducted. In the experiment, the single-side braking
power of the IP-HRA reaches 300 kW and its torque can be controlled by adjusting the outlet pressure. A co-simulation
model of articulated vehicles is established to predict the braking state by computer solutions. Based on the experimental data,
the methods of IP-HRA braking semi-trailer and traditional HR braking tractor are compared. The results of co-simulation
show that the IP-HRA is more conducive to the braking stability of the articulated vehicle than the traditional HR when only
retarder is used. Finally, the braking time and braking deceleration of IP-HRA are verified by road experiments. |
| Key Words:
Auxiliary brake, Hydraulic retarder axle, Experiment, Articulated vehicle, Braking stability
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Corresponding Author.
Desheng Li , Email. 
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