Patent ID: 6849019

Claim:
A transmission mechanism for driving four wheels of an automotive vehicle comprising: a drive housing having a first bearing bracket disposed at a middle portion thereof, a second bearing bracket disposed at the middle portion thereof, a third bearing bracket disposed at a left upper portion thereof, a fourth bearing bracket disposed at a right upper portion thereof, a fifth bearing bracket disposed below the first bearing bracket, and a sixth bearing bracket disposed at a lower portion thereof; a differential mechanism including a right side bevel gear, a left side bevel gear, and a ring gear; a driving power input shaft mounted within said first bearing bracket; a first dual tandem gear slidably mounted on said driving power input shaft; a core shaft mounted within said second bearing bracket, on which said differential mechanism is mounted; a sixth gear connected with said core shaft; a seventh gear connected with said core shaft; a rear right wheel output shaft mounted within said third bearing bracket; an eighth gear fixed to said rear right wheel output shaft; a rear left wheel output shaft mounted within said fourth bearing bracket; a ninth gear fixed to said rear left wheel output shaft; a middle shaft mounted within said fifth bearing bracket; a left gear mounted on said middle shaft close to said fifth bearing bracket; a right gear mounted on said middle shaft to mesh with said ring gear; a middle gear mounted on said middle shaft between said left and said right gear; a front right wheel output shaft mounted within said sixth bearing bracket; a clutch gear mounted on said front right wheel output shaft; a tenth gear mounted on said front right wheel output shaft; and a front left wheel output shaft connected with said tenth gear, into which said front right wheel output shaft is extended, wherein when said driving power input shaft is driven, said first dual tandem gear can be regulated to mesh with either said left gear or said middle gear so that the automotive vehicle can obtain different speeds, and wheels at the same side of the automotive vehicle can be driven at the same time.