Chapter 24 Braking system 窗日桥大学 TONGII UNIVERSTTY Wheel Cylinder Brake >Common wheel cylinder brakes are: Leading Trail证ing Shoe Brake、Two Leading Shoe Brake、 Dual Two Leading Shoe Brake Two Trailing Shoe Brake Unidirectional Servo Brake & B正 directional Servo Brake
Chapter 24 Braking system Wheel Cylinder Brake Common wheel cylinder brakes are: Leading Trailing Shoe Brake、Two Leading Shoe Brake 、 Dual Two Leading Shoe Brake、Two Trailing Shoe Brake 、 Unidirectional Servo Brake & Bidirectional Servo Brake
Chapter 24 Braking system 同©大学 TONGII UNIVERSTTY Leading Trailing Shoe Brake >Brake drum is installed on wheel cylinder pisto brake 一brake plate brake shoe piston top block the flange of the wheel hub. drum reset spring brake plate brake wheel cylinder adjusting cam >Brake plate is installed on friction plate lock pin of the the flange of the rear drive adjusted cam adjusting cam compressed spring axle housing tube with bolts. rear brake shoe front brake shoe >The lower end of T- sectioned brake shoes and the brake shoe reset spring offset mandrel neck of the front brake shog brake shoe supportting pin rear brake shoe supporting pin is a clearance fit. plate inner side of the supportting pin brake shoe lmiting spring The Rear Wheel Brake of BJ2023 >The friction plate is riveted on the outside surface with Eccentric pin countersunk rivets
Chapter 24 Braking system Leading Trailing Shoe Brake Brake drum is installed on the flange of the wheel hub. Brake plate is installed on the flange of the rear drive axle housing tube with bolts. The lower end of Tsectioned brake shoes and the offset mandrel neck of the supporting pin is a clearance fit. The friction plate is riveted on the outside surface with countersunk rivets. Eccentric pin
Chapter 24 Braking system 同©大学 TONGII UNIVERSTTY Leading Trailing Shoe Brake >Leading Shee:When braking wheel cylinder piston brake plate brahe shoe the rotating direction of the piston top block reset spring expanding brake shoe is the brake plate brake wheel adjusting cam same with the rotating direction cylinder friction plate of the brake drum. adjusted cam com-B」 lock pin of adjusting cam pressed spri山g >Trailing Shoe:When braking, the rotating direction of the rear brake thoe front brake shoe expanding brake shoe is opposite to the rotating direction of the brake thoe reset spring brake drum. front brake shog. brake shoe lmitting ba rake shoe >Using floating piston in the wheel cylinder,the diameters are spring washer plate brake thoe limitting spring equal. inner side of supportting pin eccentric pin >The promoting force of the two brake shoes are equal >Equal Promoting Force Brake:the forever. promoting force of the two brake shoes of a leading trailing shoe brake are equal
Chapter 24 Braking system Leading Trailing Shoe Brake Leading Shoe：When braking， the rotating direction of the expanding brake shoe is the same with the rotating direction of the brake drum. Trailing Shoe：When braking, the rotating direction of the expanding brake shoe is opposite to the rotating direction of the brake drum. Using floating piston in the wheel cylinder, the diameters are equal. The promoting force of the two brake shoes are equal forever. Equal Promoting Force Brake ： the promoting force of the two brake shoes of a leading trailing shoe brake are equal
Chapter 24 Braking system 月儕大学 TONGII UNIVERSTTY Leading Trailing Shoe Brake >Brake Wheel Cylinder generates a Force situation of leading shoe promoting force Fs. >The force brake drum exerts on leading shoe are FNi&Fri. >The force supporting pin exerts on FNI FN2 leading shoe is Fs1. leading shoe trailing shoe FT2 >The orientation of torques around the pivot generated by FrI and Fs are continue stop the same,making the leading shoe Fs2 pressed more tighten. Braking Principle and the leading shoe force situation >FNI and FT become bigger. >Leading Shoe has a growing effect
Chapter 24 Braking system Brake Wheel Cylinder generates a promoting force FS. The force brake drum exerts on leading shoe are FN1& FT1 . The force supporting pin exerts on leading shoe is FS1 . The orientation of torques around the pivot generated by FT1 and FS are the same, making the leading shoe pressed more tighten. Leading Trailing Shoe Brake FN1 and FT1 become bigger. Leading Shoe has a growing effect
Chapter 24 Braking system 同©大学 TONGII UNIVERSTTY Leading Trailing Shoe Brake >Brake Wheel Cylinder generates a Force situation of trailing shoe promoting force Fs. >The force brake drum exerts on trailing shoe are FN2&FT2. >The force supporting pin exerts on FNI FN2 trailing shoe is Fs2. leading shoe trailing shoe Fr2 >The orientation of torques around Fst the pivot generated by Fr2 and Fs are Continue Stop the opposite,making the leading shoe Fs2 pressed more loosen. Braking Principle and the trailing shoe force situation >FN2 and FT2 become smaller. >Trailing Shoe has a weaken effect
Chapter 24 Braking system Leading Trailing Shoe Brake Brake Wheel Cylinder generates a promoting force FS. The force brake drum exerts on trailing shoe are FN2& FT2 . The force supporting pin exerts on trailing shoe is FS2 . The orientation of torques around the pivot generated by FT2 and FS are the opposite, making the leading shoe pressed more loosen. FN2 and FT2 become smaller. Trailing Shoe has a weaken effect