Compound Planetary Gear Sets

Compound planetary gear sets use multiple planetary components which are a variation on the simple planetary gear set. Since the inception of the simple planetary gear set, there have been numerous compound gear sets introduced. BMW transmissions use the following gear sets:

• Simpson Gear Set - used on 4HP22 and 4HP24.
• Ravigneax Gear Set - used on A4S270R, A4S310R, A5S310Z, A5S325Z, A5S360R and A5S390R.
• Wilson Gear Set - used on A5S440Z and A5S560Z.
• Lepelletier Gear Set - used on the GA6HP26Z.