ROTATABLE DRIVE CONNECTION THAT REDUCES CHATTER

• US 20120248278A1
• Filed: 03/31/2011
• Published: 10/04/2012
• Est. Priority Date: 03/31/2011
• Status: Active Grant

• Current Assignee: Lear Corporation
• Original Assignee: Lear Corporation
• Inventors: Goodbred, Neil Gentry III
• Granted Patent: US 8,783,640 B2
• Time in Patent Office: Days
• US Class Current: 248/429
• CPC Class Codes: F16C 1/08 End connections
• CPC Class Codes: F16D 1/101 without axial retaining means rotating with the coupling
• CPC Class Codes: F16D 2001/102 the torque is transmitted via polygon shaped connections
• CPC Class Codes: Y10T 403/7098 Non-circular rod section is joint component
• CPC Class Codes: Y10T 74/20462 Specific cable connector or guide

Abstract

A rotatable drive connection is provided for transmitting torque. The connection includes a first component having an aperture with a plurality of corners. The connection further includes a second component having an end portion with a plurality of edges. The end portion of the second component is smaller than the aperture of the first component. The end portion of the second component is disposed within the aperture of the first component such that at least one of the edges of the end portion is always biased into engagement with at least one of the corners of the aperture throughout a full rotation of the first and second components.

Claims

1. A rotatable drive connection comprising:

a first component including an aperture having a plurality of corners; and

a second component including an end portion having a plurality of edges, the end portion of the second component being smaller than the aperture of the first component, wherein the end portion of the second component is disposed within the aperture of the first component such that at least one of the edges of the end portion is always biased into engagement with at least one of the corners of the aperture throughout a full rotation of the first and second components.

2. The rotatable drive connection of claim 1, wherein the end portion defines an odd number of edges and the aperture defines an odd number of corners.

3. The rotatable drive connection of claim 1, wherein the end portion defines a triangular cross section that extends in a linear fashion along an axial length of the end portion when in an unstressed position.

4. The rotatable drive connection of claim 1, wherein the end portion of the second component is disposed within the aperture of first component to form a loose fitting connection.

5. The rotatable drive connection of claim 1, wherein the first component is rotatable about a first axis of rotation and the second component is rotatable about a second axis of rotation.

6. The rotatable drive connection of claim 1, wherein the end portion is biased into contact with a leading edge of the aperture and a tip of the end portion is biased into contact with an inner surface of the aperture at a location that is axially spaced from and generally opposite the leading edge.

7. The rotatable drive connection of claim 6, wherein at least one of the edges is biased into engagement with at least one of the corners at either the leading edge or the tip, and at least one outer surface of the end portion is biased into contact with an inner surface of the aperture at a location that is axially spaced from and generally opposite the engaged edge and corner.

8. The rotatable drive connection of claim 6, wherein at least two outer surfaces of the end portion are biased into contact with two inner surfaces of the aperture at either the leading edge or the tip, and at least a third outer surface of the end portion is biased into contact with a third inner surface of the aperture at a location that is axially spaced from and generally opposite the two engaged surfaces.

9. A rotatable drive connection comprising:

a first component including an aperture having a plurality of corners; and

a second component including an end portion having a plurality of edges, the end portion of the second component being disposed within the aperture of the first component such that the end portion engages a leading edge of the aperture and a tip of the end portion engages an inner surface of the aperture at a location that is axially spaced from and generally opposite the leading edge, wherein at least one of the edges of the end portion is always biased into engagement with at least one of the corners of the aperture throughout a full rotation of the first and second components.

10. The rotatable drive connection of claim 9, wherein the end portion and the aperture each define an odd number of surfaces.

11. The rotatable drive connection of claim 9, wherein the end portion defines a triangular cross section that extends in a linear fashion along an axial length of the end portion when in an unstressed position.

12. The rotatable drive connection of claim 9, wherein the end portion of the second component is disposed within the aperture of first component to form a loose fitting connection.

13. The rotatable drive connection of claim 9, wherein the first component is rotatable about a first axis of rotation and the second component is rotatable about a second axis of rotation.

14. The rotatable drive connection of claim 9, wherein at least two outer surfaces of the end portion are biased into contact with two inner surfaces of the aperture at either the leading edge or the tip, and at least a third outer surface of the end portion is biased into contact with a third inner surface of the aperture at a location that is axially spaced from and generally opposite the two engaged surfaces.

15. A power seat assembly comprising:

an adjustable seat frame;

a drive mechanism mounted to the seat frame;

an adjustment mechanism mounted to the seat frame and adapted to actuate movement of the seat frame, wherein at least one of the drive mechanism and the adjustment mechanism includes a rotatable component having an aperture that defines a plurality of corners extending along the aperture; and

a flexible driveshaft interconnected between the drive mechanism and the adjustment mechanism, the flexible driveshaft including at least one end portion defining a plurality of edges extending along the end portion;

wherein the end portion is smaller than the aperture and is received within the aperture such that at least one of the edges of the end portion is biased into engagement with at least one of the corners of the aperture throughout a full rotation of the rotatable component.

16. The power seat assembly of claim 15, wherein the end portion defines an odd number of edges and the aperture defines an odd number of corners.

17. The power seat assembly of claim 15, wherein the end portion defines a triangular cross section that extends in a linear fashion along an axial length of the end portion when in an unstressed position.

18. The power seat assembly of claim 15, wherein the component having an aperture is rotatable about a first axis of rotation and the end portion of the flexible driveshaft is rotatable about a second axis of rotation.

19. The power seat assembly of claim 15, wherein at least one of the edges is biased into engagement with at least one of the corners at either the leading edge or the tip, and at least one outer surface of the end portion is biased into contact with an inner surface of the aperture at a location that is axially spaced from and generally opposite the engaged edge and corner.

20. The power seat assembly of claim 19, wherein at least two outer surfaces of the end portion are biased into contact with two inner surfaces of the aperture at either the leading edge or the tip, and at least a third outer surface of the end portion is biased into contact with a third inner surface of the aperture at a location that is axially spaced from and generally opposite the two engaged surfaces.