Disc brake with permanent magnet parking brake mechanism and braking method

Abstract

The invention discloses a disc brake with a permanent magnet parking brake mechanism and braking method for highway transportation vehicles. A main piston and a permanent magnet driving device are arranged in a cylinder body; when a manual brake is pulled, a magnetic circuit in a permanent magnet device is open; a magnetic field is generated nearby a conductor, and the conductor contacts with theshell of the permanent magnet device towards right, so that two pull rods are driven to generate displacement and driving a round wheel to rotate so as to push the main piston to move towards left todrive a brake block assembly to move towards left, thereby braking a brake disc to generate braking; and when the manual brake is released, the magnetic circuit in the permanent magnet device is closed, and the two pull rods and the round wheel return, so that the main piston moves towards right to return. In the invention, as the disc brake consists of the permanent magnet driving device and a mechanical mechanism, the braking security is enhanced, the fatigue strength of a driver is reduced, and no electric energy needs to be consumed.

Description

technical field [0001] The invention relates to a parking brake device for a road transport vehicle, in particular to a disc brake with a permanent magnet parking brake mechanism and a braking method. Background technique [0002] At present, road transport vehicles generally use disc brakes with parking brake mechanisms installed on the rear wheels of the vehicles, which have dual functions of service brakes and parking brakes. The service brake mechanisms of this type of brakes are basically the same, while parking There are mainly two types of braking mechanisms: turntable ball parking mechanism and floating link eccentric parking mechanism. The disadvantage of the turntable ball parking mechanism is that the braking force is affected by the ball's radius, slope, and friction coefficient. The maximum braking force of the parking mechanism is limited, so its auxiliary braking function is not strong, and it can only meet certain conditions. Parking use under. The disadvan...

AI Technical Summary

Problems solved by technology

The disadvantage of the turntable ball parking mechanism is that the braking force is affected by the ball's radius, slope, and friction coefficient. The maximum braking force of the parking mechanism is limited, so its auxiliary braking function is not strong, and it can only meet certain conditions. Parking use under

The disadvantage of the floating link eccentric parking mechanism is that there is a large angle between the rotating shaft and the floating rod due to the limitation of the relationship between the piston moving distance and the rotating angle of the rotating shaft and the requirement for the return of the brake. The larger component force in the direction of non-braking force leads to weak parking auxiliary braking function and cannot meet parking needs.

[0003] The patent publication number is CN1579855A, and the name is called " disc brake with parking brake mechanism " although the disclosed disc brake has overcome the defect of above-mentioned rotating disk ball type parking mechanism and floating link eccentric type parking mechanism, its deficiency The disadvantage is: using a purely mechanical device, when operating this device, the driver's labor intensity is high, and the braking force of each parking will vary from person to person, and the safety when parking on a large slope cannot be fully guaranteed.

In order to solve the above-mentioned shortcomings of the purely mechanical parking brake device, an electronic parking brake system is adopted, and the electronic parking brake system uses a motor as an actuator. System actuator", the actuator is composed of a transmission device and a brake caliper assembly. The output of the DC motor in the transmission device is decelerated and increased by the synchronous belt transmission mechanism and the involute small-tooth-difference planetary gear transmission mechanism. The mechanism converts the rotary motion into a linear motion, and uses the screw sleeve to push the piston and the brake block assembly to brake the brake disc. The axial freedom of the piston is limited by the brake block assembly, and the axial freedom of the screw sleeve Respectively limited by the non-round hole of the piston and the retaining ring; but the shortcomings of this actuator are: complex structure, high manufacturing cost, and a certain amount of electric energy is required to realize the parking brake, which does not meet the energy-saving requirements

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