Four-wheel drive model car

Abstract

A miniature gasoline engine is installed at the rear section of the model car. A first transmission gear is connected to and driven by the axle of the miniature gasoline engine, which in turn engages a parallel, second transmission gear, which is mounted at an end of a first transmission axle. A first bevel gear is provided at the other end of the first transmission axle, which engages a perpendicular, second bevel gear. The second bevel gear is connected to a center differential located in the center of the model car which in turn drives a second transmission axle (i.e., the main transmission axle). The second transmission axle runs through the center differential and axially through the model car, and directly drives the two front wheels and the two rear wheels, respectively.

1 . A four-wheel drive model car having a gasoline engine, two front wheels, two rear wheels, a center differential, a front different differential, a back differential, a front suspension system, a back suspension system, a front coupling, and a back coupling, comprising:
 a first transmission gear connected to and driven by the axle of said gasoline engine installed at the rear section of said model car;   a first transmission axle;   a parallel, second transmission gear at an end of said first transmission axle and engaged by said first transmission gear;   a first bevel gear at the other end of said first transmission axle;   a second bevel gear engaged by said first bevel gear and connected to said center differential; and   a second transmission axle driven by said center differential running axially through said model car, the two ends of said second transmission axle driving said two front wheels and said two rear wheels, respectively, through said front and rear couplings, differentials, and suspension systems of said model car.   
   
   
       2 . The four-wheel drive model car according to  claim 1 , wherein said first bevel gear and said second bevel gear are perpendicular. 
   
   
       3 . The four-wheel drive model car according to  claim 1 , wherein said first transmission gear and said second transmission gear are engaged for speed reduction. 
   
   
       4 . The four-wheel drive model car according to  claim 1 , wherein said center differential is located in the center of said model car.