西北农林科技大学：《汽车拖拉机学》课程PPT教学课件（英文版，下册）Chapter 1 Clutch

Chapter 1 Clutch Section 1 Function and Type 1.The Functions and Types of Clutches 1.1 Functions (1)Ensure the engine start and a smooth start to the vehicles (2)Shift gears when traveling or temporary stoppage (3)Overload protection to transmission system 1.2 Types Currently,there are mainly three categories clutch used on vehicles; friction clutch;fluid coupling and electromagnetic clutch Automobiles and tractors widely use friction clutches.According to their structures and working characteristics,they can be divided into four categories. (1)According to the number of friction discs (the driven discs),they can be divided into single-disc clutches,dual-disc clutches and multi- disc clutches. 机械电子工程学 Automobile and Tractor Northwest A&F University

Automobile and Tractor Northwest A&F University Chapter 1 Clutch 1. The Functions and Types of Clutches 1.1 Functions (1) Ensure the engine start and a smooth start to the vehicles (2) Shift gears when traveling or temporary stoppage (3) Overload protection to transmission system 1.2 Types Currently, there are mainly three categories clutch used on vehicles; friction clutch; fluid coupling and electromagnetic clutch. Automobiles and tractors widely use friction clutches. According to their structures and working characteristics, they can be divided into four categories. (1) According to the number of friction discs (the driven discs), they can be divided into single-disc clutches, dual-disc clutches and multi￾disc clutches. Section 1 Function and Type

Chapter 1 Clutch Section 1 Function and Type (2)According to the structures of hold-down mechanism,they can be divided into spring loaded clutches,lever-actuated clutches, hydraulic compression clutches and electromagnetic compression clutches. (3)According to working conditions of the friction surfaces,they can be divided into dry clutches and wet clutches. (4)According to the role of clutches in the transmission system, they can be divided into single-action clutches and double action clutches. 业机械与电子工程学原 Automobile and Tractor Northwest A&F University

Automobile and Tractor Northwest A&F University Chapter 1 Clutch (2) According to the structures of hold-down mechanism, they can be divided into spring loaded clutches, lever-actuated clutches, hydraulic compression clutches and electromagnetic compression clutches. (3) According to working conditions of the friction surfaces, they can be divided into dry clutches and wet clutches. (4) According to the role of clutches in the transmission system, they can be divided into single-action clutches and double action clutches. Section 1 Function and Type

Chapter 1 Clutch Section 2 Friction Clutch 2.The Components and Working Principle of Friction Clutches Friction clutches mainly including active part,driven part,hold- down mechanism and control mechanism. The working principle is that clutches transmit torque relying on friction between the friction surfaces of the active part and driven part. 2.1 Composition (1)Active part:Including the flywheel,clutch cover,pressure plate, which rotes together with the engine crankshaft. (2)Driven part:Including the driven plate and the clutch shaft. (3)Hold-down mechanism:Usually formed by helical springs or diaphragm springs 机城电子工程学度 Automobile and Tractor Northwest A&F University

Automobile and Tractor Northwest A&F University Chapter 1 Clutch 2. The Components and Working Principle of Friction Clutches Friction clutches mainly including active part ,driven part, hold￾down mechanism and control mechanism. The working principle is that clutches transmit torque relying on friction between the friction surfaces of the active part and driven part. 2.1 Composition (1) Active part: Including the flywheel, clutch cover, pressure plate, which rotes together with the engine crankshaft. (2) Driven part: Including the driven plate and the clutch shaft. (3) Hold-down mechanism: Usually formed by helical springs or diaphragm springs. Section 2 Friction Clutch

Chapter 1 Clutch Section 2 Friction Clutch (4)Control mechanism:Including the release bearings,release bearing seats,release lever,release pull rod,pedals,etc.. 2.2 Working Principle (1)Clutch coupling and apart Sliding friction is inevitable to produce when clutch coupling.(2) Torque transmitted by clutches Generally,torque transmitted by clutches is 2 to 2.5 or 2 to 3.5 times the engine calibration torque. (3)Clutch free clearance Free clearance is generally 2mm to 3mm.It should be regularly checked and adjusted when using. 机械写电子工程学现 Automobile and Tractor Northwest A&F University

Automobile and Tractor Northwest A&F University Chapter 1 Clutch (4) Control mechanism: Including the release bearings, release bearing seats, release lever, release pull rod, pedals, etc.. 2.2 Working Principle (1) Clutch coupling and apart Sliding friction is inevitable to produce when clutch coupling.(2) Torque transmitted by clutches Generally, torque transmitted by clutches is 2 to 2.5 or 2 to 3.5 times the engine calibration torque. (3) Clutch free clearance Free clearance is generally 2mm to 3mm. It should be regularly checked and adjusted when using. Section 2 Friction Clutch

Chapter 1 Clutch Section 2 Friction Clutch Automobile and Tractor Northwest A&F University 电子学度用

Automobile and Tractor Northwest A&F University Chapter 1 Clutch Section 2 Friction Clutch

Chapter 1 Clutch Section 2 Friction Clutch Automobile and Tractor Northwest A&F University

Automobile and Tractor Northwest A&F University Chapter 1 Clutch Section 2 Friction Clutch

Chapter 1 Clutch Section 3 Structure 3.The Basic Components of Friction Clutches 1920 212233.24 29 32 33 Figure 1-1 The clutches of Dongfeng EQ1090E automobiles 1.Clutch housing under pan 2.Flywheel 3.Friction disc rivet 4.Driven plate 5.Friction disc 6.Shockabsorber friction disc 7.Shock absorber spring 8.Shock absorber damping fin 9.Damping fin rivet 10.Clutch disc hub 11.Clutch driven shaft 12.Damping spring rivet 13.Shockabsorber damping spring 14.Driven plate rivet 15.Spacer bush of driven plate rivet 16.Pressure plate 17.Clutch cover dowel pin 18.Clutch housing 19.Clutch cover 20.Release lever supporting axle 21.Swing supportchip 22.Floating pin 23.Release lever adjusting nut 24.Release lever spring 25. Release lever 26.Release bearing 27.Return spring of release sleeve 28.Release sleeve 29.Bearing cap of clutch driven shaft 30.Release fork 31.Hold-down spring 32.Clutch driving strap rivet 33.Clutch driving strap 业机城电子工程学度 Automobile and Tractor Northwest A&F University

Automobile and Tractor Northwest A&F University Chapter 1 Clutch 3. The Basic Components of Friction Clutches 1. Clutch housing under pan 2. Flywheel 3. Friction disc rivet 4. Driven plate 5. Friction disc 6. Shock absorber friction disc 7. Shock absorber spring 8. Shock absorber damping fin 9. Damping fin rivet 10. Clutch disc hub 11. Clutch driven shaft 12. Damping spring rivet 13. Shock absorber damping spring 14. Driven plate rivet 15. Spacer bush of driven plate rivet 16. Pressure plate 17. Clutch cover dowel pin 18. Clutch housing 19. Clutch cover 20. Release lever supporting axle 21. Swing support chip 22. Floating pin 23. Release lever adjusting nut 24. Release lever spring 25. Release lever 26. Release bearing 27. Return spring of release sleeve 28. Release sleeve 29. Bearing cap of clutch driven shaft 30. Release fork 31. Hold-down spring 32. Clutch driving strap rivet 33. Clutch driving strap Figure 1-1 The clutches of Dongfeng EQ1090E automobiles Section 3 Structure

Chapter 1 Clutch Section 3 Structure 10 1.Belleville spring 2.Vice clutch shaft 3.Front pressure plate 4.Flywheel 5.Driven plate of vice clutch 6.Barricade 7.Driven plate of main clutch 8.Back pressure plate 9.Adjust screw 10.Main clutch shaft 11.Main clutch spring 12.Back nut 13.linkage pin Figure 1-2 Double action clutches of Dongfeng-50 tractors 业机械与电子工程学度 Automobile and Tractor Northwest A&F University

Automobile and Tractor Northwest A&F University Chapter 1 Clutch 1. Belleville spring 2. Vice clutch shaft 3. Front pressure plate 4. Flywheel 5. Driven plate of vice clutch 6. Barricade 7. Driven plate of main clutch 8. Back pressure plate 9. Adjust screw 10. Main clutch shaft 11. Main clutch spring 12. Back nut 13.linkage pin Figure 1-2 Double action clutches of Dongfeng-50 tractors Section 3 Structure

Chapter 1 Clutch Section 3 Structure 3.1 Active Part (1)Pressure plate (2)Clutch cover (a) (c) Figure 1-3 Frequently-used drive method of pressure plates Automobile and Tractor Northwest A&F University 电子用

Automobile and Tractor Northwest A&F University Chapter 1 Clutch 3.1 Active Part (1) Pressure plate (2) Clutch cover Figure 1-3 Frequently-used drive method of pressure plates Section 3 Structure

Chapter 1 Clutch Section 3 Structure 3.2 Driven Part (1)Driven plate B—B (Compressive State) B ® ® @ H-A (Free State) 8中2288x8 E w☒ Figure 1-4 Integrative flexibility driven plate 1.Driven disc 2,4.Friction disc 3.Smalley wave spring 5.Friction disc rivet 机被与电子工程学原 Automobile and Tractor Northwest A&F University

Automobile and Tractor Northwest A&F University Chapter 1 Clutch 3.2 Driven Part (1) Driven plate Figure 1-4 Integrative flexibility driven plate 1. Driven disc 2,4. Friction disc 3. Smalley wave spring 5. Friction disc rivet Section 3 Structure