Torsion bushings and related assemblies
A torsion bushing includes a body portion defining a torsion rod-receiving bore, one or more helical flexion ribs defining at least a portion of the torsion rod-receiving bore, and a helical lubrication reservoir adjacent to the one or more helical flexion ribs. The torsion bushing may be included in a torsion busing assembly that further includes a bracket. The bracket may have a saddle to receive the torsion bushing, and one or more flanges for coupling the bracket to a frame. The torsion bushing may be included in a torsion rod assembly that further includes the bracket and a torsion rod.
1. A torsion bushing for an automotive sway bar assembly, the torsion bushing comprising:
a body portion defining a torsion rod-receiving bore extending longitudinally through the body portion;
one or more helical flexion ribs integral with the body portion and defining a portion of the torsion rod-receiving bore comprising a torsion rod-contacting surface; and
a helical lubrication reservoir defined at least in part by the one or more helical flexion ribs, the helical lubrication reservoir comprising:
one or more spiral lubrication channels disposed along a length of the torsion bushing; and
a plurality of circumferential lubrication channels oriented perpendicular to the length of the torsion bushing and fluidly connected to the one or more spiral lubrication channels, the plurality of circumferential lubrication channels comprising:
a first circumferential lubrication channel disposed at a first end of the torsion bushing;
a second circumferential lubrication channel disposed at a second end of the torsion bushing, the second end of the torsion bushing distinct from the first end of the torsion bushing; and
a third circumferential lubrication channel disposed at a central portion of the torsion bushing.
2. The torsion bushing of claim 1 , comprising:
a lubrication port defined at least in part by the body portion, the lubrication port in fluid communication with the helical lubrication reservoir.
3. The torsion bushing of claim 1 , comprising:
a shaft seal integral with the body portion, the shaft seal located at an end portion of the torsion bushing.
4. The torsion bushing of claim 3 , comprising:
an annular lubrication reservoir defined at least in part by the shaft seal.
5. The torsion bushing of claim 4 , wherein the helical lubrication reservoir and the annular lubrication reservoir are in fluid communication.
6. The torsion bushing of claim 5 , comprising:
an additional annular lubrication reservoir in fluid communication with the helical lubrication reservoir, the additional annular lubrication reservoir located at a midward portion of the torsion bushing.
7. The torsion bushing of claim 1 , wherein the one or more helical flexion ribs have a pitch angle of from 65 to 85 degrees.
8. The torsion bushing of claim 7 , wherein the one or more helical flexion ribs respectively comprise an arc length of from 1 to 5 turns.
9. The torsion bushing of claim 1 , wherein the torsion bushing comprises a rubber material, a plastic material, or a polyurethane material.
10. The torsion bushing of claim 9 , wherein the body portion comprises a first material and the one or more helical flexion ribs comprise a second material, wherein the first material is different from the second material.
11. The torsion bushing of claim 9 , wherein the body portion has a first hardness and the one or more helical flexion ribs have a second hardness, wherein the first hardness and the second hardness differ by from 10 to 70 Shore A.
12. The torsion bushing of claim 9 , wherein the body portion has a hardness of from 50 to 90 Shore A, wherein the one or more helical flexion ribs have a hardness of from 20 to 50 Shore A.
13. The torsion bushing of claim 9 , comprising:
a shaft seal integral with the body portion, wherein the body portion has a first hardness and the shaft seal has a second hardness, wherein the first hardness and the second hardness differ by from 10 to 70 Shore A.
14. A torsion bushing assembly, comprising:
a torsion bushing comprising a body portion defining a bore and one or more helical flexion ribs extending along at least a portion of the bore, and a helical lubrication reservoir defined at least in part by the one or more helical flexion ribs, the helical lubrication reservoir comprising:
one or more spiral lubrication channels disposed along a length of the torsion bushing; and
a plurality of circumferential lubrication channels oriented perpendicular to the length of the torsion bushing and fluidly connected to the one or more spiral lubrication channels, the plurality of circumferential lubrication channels comprising:
a first circumferential lubrication channel disposed at a first end of the torsion bushing;
a second circumferential lubrication channel disposed at a second end of the torsion bushing, the second end of the torsion bushing distinct from the first end of the torsion bushing; and
a third circumferential lubrication channel disposed at a central portion of the torsion bushing; and
a bracket, the bracket comprising a saddle and one or more flanges, the saddle configured to receive the torsion bushing, and the one or more flanges for coupling the bracket to a frame.
15. The torsion bushing assembly of claim 14 , wherein the saddle provides a compression load to the torsion bushing when fitted in the saddle.
16. The torsion bushing assembly of claim 14 , wherein an outward perimeter of the torsion bushing has a geometry that comprises a truncated cylinder.
17. A torsion rod assembly, the torsion rod assembly comprising:
a torsion rod;
a torsion bushing comprising a body portion defining a torsion rod-receiving bore, one or more helical flexion ribs defining at least a portion of the torsion rod-receiving bore, and a helical lubrication reservoir adjacent to the one or more helical flexion ribs, the helical lubrication reservoir comprising:
one or more spiral lubrication channels disposed along a length of the torsion bushing; and
a plurality of circumferential lubrication channels oriented perpendicular to the length of the torsion bushing and fluidly connected to the one or more spiral lubrication channels, the plurality of circumferential lubrication channels comprising:
a first circumferential lubrication channel disposed at a first end of the torsion bushing;
a second circumferential lubrication channel disposed at a second end of the torsion bushing, the second end of the torsion bushing distinct from the first end of the torsion bushing; and
a third circumferential lubrication channel disposed at a central portion of the torsion bushing; and
a bracket comprising a saddle configured to receive the torsion bushing.
18. The torsion rod assembly of claim 17 , wherein the torsion bushing and the saddle have an interference fit, the interference fit providing a compression load between the torsion bushing and the torsion rod when fitted within the torsion rod-receiving bore.
19. The torsion rod assembly of claim 17 , wherein the torsion rod comprises an intermediate portion and a lever arm integral to the intermediate portion.
20. The torsion rod assembly of claim 19 , comprising:
an end link; and
a torsion rod-coupling assembly configured to couple the torsion rod to the end link, the torsion rod-coupling assembly comprising a torsion rod-bushing, the torsion rod-bushing comprising a body portion defining a bore and one or more helical flexion ribs extending along at least a portion of the bore.