Chapter 6 Brake System Section2 Brake 1.Brake Types Brakes have many types.They can be divided into the wheel brakes and parking brakes according to their application.According to their structures,wheel brakes can be divided into band brakes,drum brakes and disc brakes;Parking brakes can be divided into shoe disc brakes and drum parking brakes. 2.Drum Brake 2.1 Wheel Cylinder Brake 2.1.1 Simple non-balancing brake N1N2, F1F2, The braking torques of left and right shoes are not equal.The torque of tight shoe is 2 to 2.5 times than that of the loose shoe. 机械电子工程学 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 6 Brake System 1. Brake Types Brakes have many types. They can be divided into the wheel brakes and parking brakes according to their application. According to their structures, wheel brakes can be divided into band brakes, drum brakes and disc brakes; Parking brakes can be divided into shoe disc brakes and drum parking brakes. 2. Drum Brake 2.1 Wheel Cylinder Brake 2.1.1 Simple non-balancing brake N1≠N2, F1≠F2, The braking torques of left and right shoes are not equal. The torque of tight shoe is 2 to 2.5 times than that of the loose shoe. Section 2 Brake
Chapter 6 Brake System Section2 Brake Figure 6-2 Diagram of simple non-balancing brake 1.Front brake shoe 2.Rare brake shoe 3,4.Support pin 5.Brake drum 机械电子工程学度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 6 Brake System Figure 6-2 Diagram of simple non-balancing brake 1. Front brake shoe 2. Rare brake shoe 3,4. Support pin 5. Brake drum Section 2 Brake
Chapter 6 Brake System Section2 Brake 2.1.2 Balance Brake (1)One-way assisting balance brake (2)Two-way assisting balance brake N (a) (b) Figure 6-4 Working conditions of two-way assisting balance brake Figure 6-3 Diagram of one-way (a)Braking when forward (b)Braking when reverse assisting balance brake 1.Brake bottom plate 2,6.Wheel braking cylinder 3.5.Return spring 4.Brake shoe 机被有电子工程聚 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 6 Brake System 2.1.2 Balance Brake (1) One-way assisting balance brake (2) Two-way assisting balance brake Figure 6-3 Diagram of one-way assisting balance brake Figure 6-4 Working conditions of two-way assisting balance brake (a) Braking when forward (b) Braking when reverse 1. Brake bottom plate 2,6. Wheel braking cylinder 3,5. Return spring 4. Brake shoe Section 2 Brake
Chapter6 Brake System Section2 Brake (3)Self-servo brake 10 Figure 6-5 Bi-directional-servo brake 1.Brake bottom plate 2.Rare brake shoe 3.Return spring of rare brake shoe 4.Clamp 5.Wheel braking cylinder 6.Return spring of front brake shoe 7.Front brake shoe 8.Adjustable push rod 9.Stretched spring 10.Adjusting screw 11.Push rod sleeve 业机电子工程学度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 6 Brake System (3) Self-servo brake Figure 6-5 Bi-directional-servo brake 1. Brake bottom plate 2. Rare brake shoe 3. Return spring of rare brake shoe 4. Clamp 5. Wheel braking cylinder 6. Return spring of front brake shoe 7. Front brake shoe 8. Adjustable push rod 9. Stretched spring 10. Adjusting screw 11. Push rod sleeve Section 2 Brake
Chapter 6 Brake System Section2 Brake 2.2 Cam Brake Pneumatic transmission brakes normally adopt cam type expander. 10 Figure 6-6 Cam brake Figure 6-7 Brake plunger arm 1.Axle journal of knuckle 2.Brake shoe 3.Return spring 4.Brake camshaft 5.Brake plunger arm 1.Spring 2.Dust guard 3.Worm 6.Brake repair room 7.Brake bottom plate shaft 4.Lock-up sleeve 5.Lock 8.Brake drum 9.Shoe shaft 10.Cotter bolt 6.Worm 7.Housing 机械与电子工程学聚 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 6 Brake System 2.2 Cam Brake Pneumatic transmission brakes normally adopt cam type expander. Figure 6-6 Cam brake Figure 6-7 Brake plunger arm 1. Axle journal of knuckle 2. Brake shoe 3. Return spring 4. Brake camshaft 5. Brake plunger arm 6. Brake repair room 7. Brake bottom plate 8. Brake drum 9. Shoe shaft 10. Cotter 1. Spring 2. Dust guard 3. Worm shaft 4. Lock-up sleeve 5. Lock bolt 6. Worm 7. Housing Section 2 Brake