Patent ID: 6840881

Claim:
A transmission mechanism for an automotive vehicle comprising a housing ( 21 ) having a first bearing bracket ( 211 ) disposed at the upper portion thereof, a second bearing bracket ( 212 ) disposed at the lower portion thereof, a third bearing bracket ( 213 ) disposed at the left portion thereof and a fourth bearing bracket ( 216 ) disposed at the right portion thereof; a caseless differential mechanism ( 19 ) including a right side bevel gear ( 9 ), a left side bevel gear ( 18 ) and a ring gear ( 17 ); a driving power input shaft ( 1 ) mounted within said first bearing bracket ( 211 ) of said housing ( 21 ); a first dual tandem gear ( 2 ) mounted on said driving power input shaft ( 1 ); a second dual tandem gear ( 5 ) mounted on said driving power input shaft ( 1 ) at middle portion thereof; a first sliding gear ( 7 ) slidably fixed on said driving power input shaft ( 1 ); a rear right wheel output shaft ( 3 ) mounted within said third bearing bracket ( 213 ); a fourth gear ( 4 ) fixed on said rear right wheel output shaft ( 3 ) and engaged to said first dual tandem gear ( 2 ); a third dual tandem gear ( 6 ) mounted on said rear right wheel output shaft ( 3 ) and engaged to said second dual tandem gear ( 5 ) and said first gear ( 7 ); a core shaft ( 10 ) mounted within said sixth bearing bracket ( 216 ), on which said caseless differential mechanism ( 19 ) is mounted; a fifth gear ( 20 ) connected with said left side bevel gear ( 18 ) and engaged to said first dual tandem gear ( 2 ); a sixth gear ( 8 ) connected with said right ride bevel gear ( 9 ); a propeller shaft ( 12 ) mounted within said second bearing bracket ( 212 ); a second sliding gear ( 16 ) mounted on a shaft sleeve ( 121 ) of said propeller shaft ( 12 ); a third sliding gear ( 11 ) fixed to said propeller shaft ( 12 ); a slidable engaging member ( 13 ) connected with said propeller shaft ( 12 ); a front left wheel output shaft ( 14 ) engaged with said slidable engaging member ( 13 ); and a front right wheel output shaft ( 15 ) engaged with said slidable engaging member ( 13 ), wherein when said driving power input shaft ( 1 ) is driven, said first sliding gear ( 7 ) can be regulated to mesh with either said third dual tandem gear ( 6 ) or said second dual tandem gear ( 5 ), 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.