Quattrro is a registered trademark of Audi's four-wheel drive technology. 1980, Audi released a model equipped with Quattro full-time four-wheel drive technology at the Geneva Motor Show, marking the birth of Audi brand technology Quattro. Audi Quattro full-time four-wheel drive system has undergone six innovations, and has become a representative technology of four-wheel drive with quick response, stability and reliability. The core technology of Audi Quattro is Torsen central differential with pure mechanical structure.
Extended data
Full-time four-wheel drive basic model
(1) Fixed torque distribution planetary inter-axle differential, additional viscous clutch, automatic locking electromagnetic clutch at different speeds (for electronic control operation);
(2) Electronically controlled multi-disc clutch (Haldax clutch);
(3) For the viscous clutch on the power transmission line of the transmission shaft, the initial non-drive axle should be selected according to the tire slip.
The basic model of full-time four-wheel drive is a standard design passenger car. If all four wheels of a standard passenger car are changed into driving wheels, it will require a lot of modification, with greater design complexity and lower transmission efficiency. A transfer case is needed to connect a short transmission shaft to transmit the torque of the engine to the front differential. The lateral deviation must be bridged, for example, using a tooth chain. The ground clearance is not allowed to increase. Therefore, it is inevitable to replace the oil pan of the engine in order to install the front axle differential.
The transfer case includes an inter-planetary differential, through which variable power distribution (based on internal transmission ratio) can be obtained. About 36% of the driving torque is distributed to the front axle and about 64% to the rear axle. Multi-disc clutches can also be installed to electromagnetically lock the differential 100% according to the torque requirements (front axle and rear axle). In addition, there is an electro-hydraulic differential lock in the rear axle. It can also achieve the locking effect of 100%.