Parking brake device for electric drive axle of electric vehicle

Abstract

The invention discloses a parking brake device for an electric drive axle of an electric vehicle. The parking brake device comprises a motor, a parking brake assembly, a reduction gearbox assembly, a differential mechanism and the drive axle. The parking brake assembly is connected with an output shaft of the motor assembly, the reduction gearbox assembly is connected with a gear at the output shaft end of the motor, the differential mechanism is connected with the reduction gearbox assembly, and the drive axle is connected with the differential mechanism. The parking brake assembly comprises brake calipers, a brake disc and a parking brake triggering mechanism. The brake disc is arranged on an output shaft of the motor, and the brake caliper is arranged on the brake disc in a sleeving mode. The parking brake triggering mechanism is connected with the brake calipers; according to the device, the disc brake with the small size is additionally arranged in the electric drive axle transmission chain, the transmission ratio of a transmission system is utilized, the braking performance is effectively improved, and meanwhile due to the fact that the brake is integrated into the reduction gearbox and the motor shell, the parking brake is effectively protected, and the parking brake is more reliable; and meanwhile, the overall available space is saved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle braking, in particular to a parking braking device for an electric drive axle of an electric vehicle. Background technique [0002] When the total mass of the electric vehicle is large, the central brake is often used to realize the parking brake. When the electric vehicle adopts the transmission shaft direct drive scheme, the central brake can be connected in series on the transmission shaft, but when the electric vehicle adopts the electric drive axle, the motor and There is no transmission shaft between the drive axles, and the traditional central brake cannot be used. The existing solution is to use wheel brakes to realize parking brakes; [0003] The performance of the wheel brake is weaker than that of the central brake, which cannot meet the performance requirements of the vehicle with a large total mass, and the wheel brake needs to distribute the force of the hand brake zipper, w...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a parking braking device for the electric drive axle of an electric vehicle in view of the above disadvantages, which solves the problem in the prior art that the braking effect of the wheels is not good when the electric vehicle with a large load is parked. Yes, and the wheel brakes usually share a set of brakes with the driving brakes. If the brakes fail, the parking brakes and the driving brakes will fail at the same time, which poses a safety hazard.

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