Patent ID: 6889989

Claim:
A torsion beam suspension comprising: a left spindle that rotably supports a left rear wheel; a right spindle that rotably supports a right rear wheel; a left trailing arm disposed in a longitudinal direction of a car body, a first side of the left trailing arm being coupled with the left spindle; a right trailing arm disposed in the longitudinal direction of the car body, a first side of the right trailing arm being coupled with the right spindle; a left bush that connects a second side of the left trailing arm to the car body; a right bush that connects a second side of the right trailing arm to the car body; and a torsion beam for connecting the left trailing arm and the right trailing arm, the torsion beam comprising a U-shaped open section having a central portion and enlarged portions located on each side of the central portion, the torsion beam further comprising ribs located in the enlarged portions and forming closed sections which increase in size as the distance from the central portion increases, wherein the ribs are located at locations where the enlarged portions adjoin the central portion, and grooves are formed on the ribs.