Chap 3 Power Train

Chap 3 Power Train - Lecture Note Chap-3 Power Train Motor...

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Unformatted text preview: Lecture Note Chap-3: Power Train Motor Vehicle Engineering MEng 5165 By: Shewangizaw W 3. Power Train 3. Power train Ø In a vehicle, the mechanism that transmits the power developed by the engine to the wheels is called the power train. Ø The power train serves two functions: 1. transmits power from the engine to the drive wheels 2. varies the amount of speed and torque. Ø. The two common sets of gears in power train are: 1. Transmission gear DRIVE ARRENGMENTS: (2WD, 4WD) 2WD (2-Wheel Drive) Part time 4 Wheel Drive Full time 4 Wheel drive 3.1 CLUTCH Clutch capacity depends on the following factors: ü Effective radius of the friction surface ü Coefficient of friction acting between the friction surfaces ü No of friction surface ü Clamping force holding the friction surfaces Clutch requirements: ü It must engage the engine and transmission/transaxle smoothly, ü Once it engages, it must transmit power entirely without slipping, 3.1.1 COMPONENT OF CLUTCH An engine clutch consists primarily of four parts: 1. Fly wheel 2. Friction/clutch disc 3. Pressure plate assembly 4. Release/control mechanism 3.1.1.1 INSIDE THE CLUTCH HOUSING: The clutch housing is a stamped or cast metal part, which houses the clutch and connects the transmission housing to the back of the engine. 1. Fly wheel 3.1.1.2 Pressure plate assembly with coil spring: 3.1.1.3 Pressure plate assembly with Diaphragm type spring: 3.1.3. CLUTCH RELEASE MECHANISM 3.1.3.1 Operating mechanisms There are two types of clutch, distinguished by the way they are operated the hydraulically operated clutch and the mechanically operated clutch using a cable linkage. 3.1.3.2 Mechanical type clutch 3.1.3.3 Hydraulic clutch 3.2 MANUAL TRANSMISSION/TRANSAXLE It is an assembly of gears and shafts to transmit the rotation and torque of the engine to the driveline or final drive. The operating principles of the gears, shafts, bearings and shift mechanisms in manual transmissions and transaxles are basically the same. 3.2.1 PURPOSE OF A MANUAL TRANSMISSION: If in proper operating condition, a manual transmission should do the following • Be able to increase torque going to the drive wheel for quick acceleration, • Supply different gear ratios to match different engine load conditions, • Have a reverse gear for moving the vehicle backwards, • Provide the operator with an easy means of shifting transmission gears, 3.2.2 MAJOR COMPONENTS OF A MANUAL TRANSMISSION: The following are most common components 1. Transmission Case (20) 2. Extension Housing (21) 3. Transmission Shafts: a. Input shaft.(1) b. Countershaft.(12) c. Reverse idler shaft.(14) d. Main shaft.(5) 4. Transmission Gears :- can be classified into four groups- input gear, countershaft gears(11), main shaft gears(4,6,7,8), and the 5. Shift Linkage and Levers:- are the EXTERNAL ROD and the INTERNAL SHIFT RAIL. They both perform the same function. They connect the shift lever with the shift fork mechanism.connect the shift lever with the shift fork mechanism....
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This note was uploaded on 12/16/2011 for the course MENG 5165 taught by Professor Shewangizaw during the Spring '11 term at Cornell.

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Chap 3 Power Train - Lecture Note Chap-3 Power Train Motor...

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