SSP363 Audi Q7 - Power Transmission / Transfer Case ... - Volkspage

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22 <strong>Transfer</strong> case 0AQ Front axle torque Asymmetric/dynamic torque distribution In addition to the asymmetric basic torque distribution of 42:58, a friction torque proportional to the driving torque is generated in the differential resulting in a corresponding locking torque. Locking torque plus basic torque distribution is the determining factor for the maximum torque distribution to the axles. Basic torque distribution 100 % 80 60 42 20 0 EDL Operating range Differential EDL Asymmetric/dynamic torque distribution in the self-locking centre differential (under throttle) A self-locking centre differential is characterised by four operating states: Maximum distribution to front axle and maximum distribution to rear axle while driving under throttle and while coasting (overrun). Basically, the centre differential responds to changes in torque at the axles. If an axle loses traction, the driving torque is redirected instantaneously to the other axle within the torque distribution limits. If the working limits of the centre differential are exceeded, the EDL control engages and provides forward traction. yellow - orange: low coefficient of friction = snow and ice green: High coefficients of friction = dry and wet 0 20 40 58 80 100 % Rear axle torque 363_016 These four operating states are characterised by four locking ratios, which can be configured differently.
Asymmetric/dynamic torque distribution The gears of the differential have a defined helicalcut gear form. Thus, the driving torque produces an axial force which acts upon the gears, which, in turn, act upon various friction discs and generate friction. The friction, in turn, produces the desired lock-up effect. Lock-up effect under throttle Lock-up effect while coasting The magnitude of the lock-up effect is defined by the locking ratio. The locking ratio by is the factor* by which the driving torque is transmitted to the axle which can transmit the greater driving torque. * number or quantity that is multiplied by another (multiplicand). = axial force under throttle Helical spline, used to increase frictional force by means of additional friction discs = axial force while coasting 363_020 363_021 23
Page 1 and 2: Service Training Audi Q7 - Power Tr
Page 3 and 4: Contents Introduction Drive concept
Page 5 and 6: One of the primary development goal
Page 7 and 8: The front and rear axle differentia
Page 9 and 10: The 6-speed automatic gearbox 0AT..
Page 11 and 12: Automatic gearbox selector mechanis
Page 13 and 14: DSO images of P/R/N/D/S signals DSO
Page 15 and 16: DSO images of the tiptronic signal
Page 17 and 18: Design / function The transfer case
Page 19 and 20: Friction disc Components overview R
Page 21: Asymmetric basic torque distributio
Page 25 and 26: Example of static torque distributi
Page 27 and 28: Design and function of the gear cha
Page 29 and 30: This is how it works: The upper sha
Page 31 and 32: Service / special tools To avoid ha
Page 33: Electronic Differential Lock EDL On

SSP363 Audi Q7 - Power Transmission / Transfer Case ... - Volkspage

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