Question about 2000 Jeep Grand Cherokee
Does anyone know how Quadra Drive works (in my case a 2000 JCG Ltd)? I know in THEORY how the torque gets transferred etc. But I want to know HOW it knows to transfer the torque, the role of any sensors and solenoids, etc. I have scoured the web and can only seem to find high level overviews.
Under normal driving conditions, the system operates conventionally, and the majority of available torque is applied to the rear wheels. However, when front-to-rear wheel speed variations exist, the progressive differential transfers torque to the axle with the better traction, thus minimizing wheel spin and maximizing control.
The key to this design is a progressive coupling Progressive Coupling , which is supplied with pressurized oil by a gerotor style pump. The pump rotor and case are driven by the front and rear driveshafts respectively, and deliver pressurized oil flow to the coupling in proportion to their speed difference. The progressive coupling contains a multi-disc clutch pack that is alternately splined to the front and rear driveshafts, and controls torque variation between the front and rear driveshafts as dictated by the pump.
A set of orifices and valves control the speed-differential starting point and rate of torque transfer rise in the clutch. This allows the system to disregard the normal speed differences between axles that result from variations in front-to-rear loading and typical cornering.
Transfer case operating ranges are selected with a floor mounted shift lever. The shift lever is connected to the transfer case range lever by an adjustable cable. Range positions are marked on the shifter bezel plate
Posted on Jan 10, 2009
Quadra-trac is a fancy name that simply means full time 4wd. Inside the transfer case is a part called the viscous coupler, this part connects the front shaft and the rear shaft. This unit is sealed and can only be replaced. This unit has a thick honey type oil in it that will give you full time 4wd and will also slip when making turns so you don't get that binding feeling you get in a part time 4wd system.
Posted on Jan 08, 2009
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