Motorized vehicle having forward and backward differential structure

Abstract

A motorized vehicle includes a plurality of single-direction thrust bearings mounted between each of the two rear wheels and the propeller shaft. The single-direction thrust bearings located at one rear wheel is used to drive the motorized vehicle to move forward, and the single-direction thrust bearings located at the other rear wheel is used to drive the motorized vehicle to move backward. Thus, when the two rear wheels are subjected to a drag and cannot be rotated with the propeller shaft synchronously, the single-direction thrust bearings will idle, thereby producing a differential effect.

What is claimed is:  
     
         1 . A motorized vehicle, comprising: 
 two rear wheels;    a propeller shaft mounted on the two rear wheels and having two ends; and    a plurality of single-direction thrust bearings mounted between each of the two rear wheels and the propeller shaft, wherein:    the single-direction thrust bearings located between one of the two rear wheels and a first end of the propeller shaft has a rotation direction opposite to a normal rotation direction of the propeller shaft to drive the motorized vehicle to move forward; and    the single-direction thrust bearings located between the other one of the two rear wheels and a second end of the propeller shaft has a rotation direction opposite to a reverse rotation direction of the propeller shaft to drive the motorized vehicle to move backward.    
     
     
         2 . The motorized vehicle in accordance with  claim 1 , wherein each of the two ends of the propeller shaft is provided with a bearing cap, two single-direction thrust bearings, a bearing seat, and a fixing member.  
     
     
         3 . The motorized vehicle in accordance with  claim 2 , wherein the bearing seat is formed with a plurality of screw bores, the bearing cap is formed with a plurality of through holes, and the motorized vehicle further comprises a plurality of locking screws each extended through a respective one of the through holes and each screwed into a respective one of the screw bores, thereby fixing the bearing cap on the bearing seat.  
     
     
         4 . The motorized vehicle in accordance with  claim 2 , wherein each of the two single-direction thrust bearings is mounted between the bearing seat and the propeller shaft.  
     
     
         5 . The motorized vehicle in accordance with  claim 2 , wherein each of the two ends of the propeller shaft is formed with a keyway, each of the two single-direction thrust bearings has an inner race formed with an inner keyway, and the motorized vehicle further comprises a first key secured in the inner keyway of each of the two single-direction thrust bearings and the keyway of the propeller shaft, so that each of the two single-direction thrust bearings is combined with the propeller shaft.  
     
     
         6 . The motorized vehicle in accordance with  claim 2 , wherein each of the two single-direction thrust bearings has an outer race formed with an outer keyway, the bearing seat has two sides each formed with a keyway, and the motorized vehicle further comprises two second keys each secured in the outer keyway of a respective one of the two single-direction thrust bearings and the keyway of the bearing seat, so that each of the two single-direction thrust bearings is combined with the bearing seat.  
     
     
         7 . The motorized vehicle in accordance with  claim 2 , wherein each of the two ends of the propeller shaft is formed with a catch flange, one of the two single-direction thrust bearings is rested on and limited by the catch flange of the propeller shaft and the bearing cap.  
     
     
         8 . The motorized vehicle in accordance with  claim 7 , wherein the fixing member is secured on the propeller shaft and is rested on the other one of the two single-direction thrust bearings.  
     
     
         9 . The motorized vehicle in accordance with  claim 2 , wherein each of the two ends of the propeller shaft is formed with an outer thread, and the fixing member is formed with an inner thread screwed on the outer thread of the propeller shaft, so that the fixing member is fixed on the propeller shaft.  
     
     
         10 . The motorized vehicle in accordance with  claim 2 , wherein the bearing seat has a periphery provided with a fixing board, and each of the two rear wheels is secured on the fixing board of the respective bearing seat.  
     
     
         11 . The motorized vehicle in accordance with  claim 10 , wherein the fixing board of the bearing seat is formed with a plurality of through holes, each of the two rear wheels is formed with a plurality of through holes, and the motorized vehicle further comprises a plurality of locking bolts each extended through a respective one of the through holes of the fixing board of the bearing seat and a respective one of the through holes of the respective rear wheel, so that each of the two rear wheels is fixed on the fixing board of the respective bearing seat.