Eddy current retarder with torsional vibration reduction function

Abstract

The invention relates to an automobile braking device, in particular to an eddy current retarder with a torsional vibration reduction function. The eddy current retarder with the torsional vibration reduction function comprises a stator, an upstream rotor and a downstream rotor, wherein the upstream rotor is used for being connected with an automobile gear box, the downstream rotor is used for being connected with a transmission shaft on the front end of a rear axle, and a vibration reduction buffering device used for being connected with the transmission shaft on the front end of the rear axle is arranged on the downstream rotor. During operation, a torsional countermoment which is instantaneously generated acts on the vibration reduction buffering device, so as to reduce torque impact which is instantaneously generated through the buffering and damping effects of the vibration reduction buffering device, thereby achieving the purpose of reducing impact and vibration; in addition, when the retarder is not braked, the vibration reduction buffering device is connected into a transmission system in series, so as to be favorable for reducing torque fluctuation which is generated by an engine and a shafting space angle and improving the NVH (Noise, Vibration and Harshness) performance of the transmission system. In conclusion, by using the eddy current retarder, vibration and noise caused by the retarder to an automobile can be reduced.

Description

technical field [0001] The invention relates to an automobile braking device, in particular to an eddy current retarder with torsional damping function. Background technique [0002] The eddy current retarder is a vehicle auxiliary braking device. It is generally composed of a stator, a stator bracket and a rotor coaxially arranged on both sides of the stator. It is often installed between the automobile drive axle and the gearbox. contact brake. When the retarder is working, the stator coil is energized to generate a magnetic field. At this time, the rotor rotating with the drive shaft will cut the magnetic field lines generated by the stator, thereby generating a vortex-shaped induced current inside the rotor disk, and the stator will flow to the rotor at the same time. Apply an electromagnetic force that hinders the rotation of the rotor, and then generate a braking torque to form a braking effect. [0003] The eddy current retarder can effectively improve the braking s...

AI Technical Summary

Problems solved by technology

On the one hand, when the retarder is braking, the braking force comes from before the main reducer of the rear axle, and the braking torque is opposite to the driving torque. At this time, the rotation speed of the driven gear of the main 1. The passive gear is in the meshing state of the back of the teeth. Due to the large reaction torque and the meshing accuracy of the main minus back teeth, the rear axle is prone to generate large vibration and noise at this time. At the same time, the instantaneous braking torque acts on the drive train. It will have a large impact on the gears of the gearbox, especially the gears of the rear axle, which will aggravate the vibration and noise of the rear axle and affect the service life of the rear axle; on the other hand, when the retarder is not braking, the vehicle will The rear axle gear drives the transmission shaft and the retarder rotor. Due to the large moment of inertia of the retarder rotor, the load on the rear axle gear fluctuates greatly, which easily causes vibration and noise of the rear axle. In addition, when the vehicle is started and accelerated Among them, the retarder rotor will accelerate with the rapid change of engine speed and torque. Due to the large moment of inertia of the retarder rotor and the existence of shaft assembly clearances such as the drive shaft and rear axle, the retarder rotor will generate a large torsional impact force It will be directly transmitted to the gear train of the rear axle, which will increase the instantaneous contact force of the main back gear of the main reducer of the rear axle, resulting in greater vibration and noise

[0004] From the above introduction, it can be seen that although the eddy current retarder improves the braking safety performance of the vehicle, it also brings many negative effects on the comfort of the vehicle.

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