Seatbelt retractor assembly
A seatbelt retractor includes a spool. The seatbelt retractor includes a torsion bar elongated along an axis within the spool and defining passages elongated parallel to the axis, the passages spaced from each other surrounding the axis.
1. A seatbelt retractor, comprising:
a torsion bar elongated along an axis;
a spool surrounding the torsion bar;
ribs extending radially relative to the axis from the torsion bar to the spool, the ribs spaced from each other along the axis; and
a webbing supported by the spool.
2. The seatbelt retractor of claim 1 , further comprising a base rotatably supporting the torsion bar.
3. The seatbelt retractor of claim 1 , wherein the torsion bar, spool, and ribs are monolithic.
4. The seatbelt retractor of claim 1 , wherein the spool defines a slot, the webbing in the slot.
5. The seatbelt retractor of claim 1 , further comprising teeth supported by the torsion bar.
6. The seatbelt retractor of claim 5 , wherein the teeth and the torsion bar are monolithic.
7. The seatbelt retractor of claim 1 , wherein the torsion bar defines passages elongated parallel to the axis, the passages surrounding the axis.
8. A seatbelt retractor, comprising:
a spool; and
a torsion bar elongated along an axis within the spool and defining passages elongated parallel to the axis, the passages spaced from each other surrounding the axis, the torsion bar having a first distal end and a second distal end, each on the axis, and the passages extending through the first distal end and the second distal end.
9. The seatbelt retractor of claim 8 , further comprising a base rotatably supporting the torsion bar.
10. The seatbelt retractor of claim 9 , further comprising a locking device operatively coupling the base to the torsion bar.
11. The seatbelt retractor of claim 8 , wherein the passages are arranged in a circular pattern around the axis.
12. The seatbelt retractor of claim 8 , further comprising a webbing supported by the spool.
13. The seatbelt retractor of claim 8 , wherein the passages are cylindrical.
14. The seatbelt retractor of claim 8 , wherein the torsion bar defines second passages surrounding the axis.
15. The seatbelt retractor of claim 14 , wherein the passages are closer to the axis than the second passages.
16. The seatbelt retractor of claim 14 , wherein the passages are smaller than the second passages.
17. The seatbelt retractor of claim 14 , wherein a cross-sectional area of the passages perpendicular to the axis is smaller than a cross-sectional area of the second passages perpendicular to the axis.
18. The seatbelt retractor of claim 14 , wherein the passages are radially aligned with the second passages relative to the axis.
19. A seatbelt retractor, comprising:
a torsion bar elongated along an axis;
a spool surrounding the torsion bar;
ribs extending radially relative to the axis from the torsion bar to the spool, and the torsion bar, spool, and ribs are monolithic;
and
a webbing supported by the spool.