Patent ID: 9272620
Filing Date: 2016-03-01
CPC Classification: B60K,F16H

Claim Text:
1. A drive train for a four wheel drive vehicle comprising: a front drive shaft connected to a transmission; two front axles, each axle connected to a corresponding front wheel; a front differential engaged with the front drive shaft and the front axles through a front differential gear set, the front differential including a front bi-directional overrunning clutch that controls transmission of torque transfer between the front drive shaft and the front axles, the front bi-directional overrunning clutch including: wherein the front bi-directional overrunning clutch transmits torque from the front drive shaft to the front axles when the front clutch housing is rotating faster than the front axles and the engagement control assembly is activated so as to index the roll cage relative to the clutch housing, and wherein when the vehicle is traveling straight the front differential is configured to begin to transmit torque from the front drive shaft to the front axles at a first speed; two rear axles, each axle connected to a corresponding rear wheel; and a rear differential engaged with the rear axles and the transmission through a rear differential gear set, the rear differential including a rear bi-directional overrunning clutch that controls torque transfer between the transmission and the rear axles, the rear bi-directional overrunning clutch including: wherein when the vehicle is traveling straight and the rear differential is transmitting torque to the rear axles, the rear differential is configured to rotate the rear axles at a second speed, and wherein the difference between the first speed and the second speed is five percent or less.