A. The composition of the conventional automobile braking system
The conventional brake system is composed of a service brake system and a parking brake system.
B. Requirements for the braking system
1. Has a good braking effect
2. Lightweight operation
3. Good braking stability
4. Good braking smoothness
5. Good heat dissipation
C. Composition of the service brake system
The service brake consists of the brake pedal, brake master cylinder, vacuum booster, brake hose, brake wheel cylinder, disc brake (brake disc, brake caliper, brake pad), drum brake (brake drum, brake shoe, brake pad) Adjustment organization) and other components.
1. Brake pedal: pure mechanical mechanism and a brake light switch is installed on the pedal bracket.
2. Brake master cylinder: After stepping on the brake pedal, the brake fluid is distributed to each brake cylinder through the brake master cylinder to form a braking force for brake braking.
3. Vacuum booster: Use a vacuum to form a brake booster to reduce the force applied to the brake pedal (that is, generate a larger braking force with a smaller force).
4. Brake wheel cylinder: It is the main component of each wheel to produce a braking force. It is mainly composed of brake caliper, brake caliper piston, brake caliper mounting bracket, etc.
5. Disc brake
The main components of disc brakes are brake disc, cylinder, caliper, tubing, etc. The disc brake has fast heat dissipation, lightweight, simple structure, and convenient adjustment. Especially at high load, it has good high-temperature resistance and stable braking effect.
6. Drum brake
The mainstream of drum brakes is the internal tension-type. Its brake block (brake shoe) is located inside the brake wheel. When the brake is braked, the brake block expands outward and rubs the inside of the brake wheel to achieve the purpose of braking. Due to the relatively low cost, it is mainly used for rear wheels and parking brakes with relatively small braking loads.
D. Composition of the parking brake system
The parking brake consists of a handbrake handle, a handbrake cable, a handbrake tensioning mechanism, a handbrake switch, a handbrake indicator light, a handbrake shoe (some are rear-wheel brakes, and some are separate handbrakes)
E. The role of the parking brake system
1. After the vehicle stops, prevent slipping
2. Start smoothly on the ramp
3. When the service brake system fails, it temporarily makes a role or cooperates with the service brake system to play a braking role
F. The form of the service brake
1. Hydraulic type: the brake oil is used as the medium, and the brake cylinder is driven by the principle of compression
2. Pneumatic type: the brake cylinder is driven by air pressure