Hollow drive shaft for vehicle and manufacturing method thereof

Abstract

A method of manufacturing a hollow drive shaft for a vehicle may include swaging one of a first hollow tube and a second hollow tube having a same diameter to reduce an outer diameter thereof and thus allow the swaged hollow tube to be assembled in a remaining hollow tube of the first hollow tube and the second hollow tube, assembling the hollow tube that is reduced in outer diameter in the remaining hollow tube, thereby forming a hollow shaft, and joining first and second sterns to both sides of the hollow shaft, respectively.

1 - 7 . (canceled) 
     
     
         8 . A hollow drive shaft for a vehicle, comprising:
 a hollow shaft; and   first and second stems joined to left and right sides of the hollow shaft,   wherein the hollow shaft is configured such that one of a first hollow tube and a second hollow tube is inserted into a remaining hollow tube of the first hollow tube and the second hollow tube.   
     
     
         9 . The hollow drive shaft of  claim 8 , wherein the hollow shaft is formed by reducing an outer diameter of one of the first and second hollow tubes having a same diameter through swaging, and then inserting the hollow tube having the reduced outer diameter into the remaining hollow tube. 
     
     
         10 . The hollow drive shaft of  claim 8 , wherein one of the first and second hollow tubes is subjected to swaging, such that an outer diameter thereof is reduced to be less than an inner diameter of the remaining hollow tube, and then torsion torque is applied to the first and second hollow tubes, respectively, in different directions to be twisted. 
     
     
         11 . The hollow drive shaft of  claim 8 , wherein the hollow shaft has therein a hollow portion extending along a rotation axis, each of the first and second stems having a solid shape having no hollow portion therein or having a hollow shape that extends along the rotation axis.