Patent ID: 6848337

Claim:
A transmission mechanism of an automotive vehicle for driving four wheels comprising a drive housing ( 24 ); a differential mechanism ( 13 ) including a right side bevel gear ( 14 ), a left side bevel gear ( 12 ) and a ring gear ( 11 ); a driving power input shaft ( 1 ) disposed at the left upper portion of said drive housing ( 24 ); a first dual tandem gear ( 2 ) mounted on said driving power input shaft ( 1 ); a second dual tandem gear ( 3 ) slidably mounted on said driving power input shaft ( 1 ); a propeller shaft ( 20 ) disposed at said left middle portion of said drive housing ( 24 ); a fourth gear ( 4 ) mounted on one end of said propeller shaft ( 20 ); a sixth gear ( 6 ) mounted on another end of said propeller shaft ( 20 ); a fifth gear ( 5 ) mounted on said propeller shaft ( 20 ) close to said sixth gear ( 6 ) and engaged to said first dual tandem gear ( 2 ) and said ring gear ( 11 ); a third dual tandem gear ( 16 ) mounted on said propeller shaft ( 20 ) and engaged to said first dual tandem gear ( 2 ); a core shaft ( 15 ) disposed at said left lower portion of said drive housing ( 24 ), on which said differential mechanism ( 13 ) is mounted; a seventh gear ( 7 ) mounted on said core shaft ( 15 ) to engage said sixth gear ( 6 ); an eighth gear ( 17 ) connected with said core shaft ( 15 ) to engage said fourth gear ( 4 ); a front right wheel output shaft ( 10 ) engaged with said core shaft ( 15 ); a front left wheel output shaft ( 9 ) engaged with seventh gear ( 7 ); a rear left wheel output shaft ( 18 ) disposed at the right lower portion of said driving housing ( 24 ); and a ninth gear ( 19 ) mounted on said rear left wheel output shaft ( 18 ), wherein when said driving power input shaft ( 1 ) is driven, said second dual tandem gear ( 3 ) can be regulated to mesh with either said third dual tandem gear ( 16 ) or said first dual tandem gear ( 2 ) 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.