Patent ID: 6474587
Filing Date: 2002-11-05
Classification: B60R

Abstract:
A seat belt retractor comprising:a reel for spooling a seat belt; a locking mechanism for locking the rotation of the reel; and a forged torsion bar having a first connection part non-rotatably connected to the reel at one end of the torsion bar and a second connection part non-rotatably connected to the locking mechanism at the other end of the torsion bar, wherein the first and second connection parts are torx-shaped having a plurality of concavities and convexities formed in a wave-shape, and wherein concavities are formed in the reel and the locking mechanism structure for locking the rotation of the reel are formed in a torx-shape corresponding to the shape of the connecting parts with which the reel and the structure for locking the rotation of the reel are respectively connected; and wherein a ratio R1/R2 of the distance between the tops of the convexities formed in the wave-shape and the axial center of the torsion bar (radius R1) to the distance between the bottoms of the concavities and the axial center of the torsion bar (radius R2) is between 1.1 and 1.3.