Vehicle power seat adjuster with end driven lead screw actuation

• US 5,575,531 A
• Filed: 12/15/1993
• Issued: 11/19/1996
• Est. Priority Date: 12/15/1993
• Status: Expired due to Fees

• Current Assignee: Lear Corporation
• Original Assignee: ITT Corporation (ITT, Inc.)
• Inventors: Heesch, Max O., Gauger, Derek K., Rees, Richard W. A.
• Primary Examiner(s): Nelson, Jr., Milton
• Application Number:
  US08/167,732
• Time in Patent Office: 1,070 Days
• Field of Search: 297/344.1, 297/362.4, 297/344.11, 297/362.12, 74/89.15, 248/429
• US Class Current: 297/362.11
• CPC Class Codes: B60N 2/02246 Electric motors therefor
• CPC Class Codes: B60N 2/067 by linear actuators, e.g. linear screw mechanisms
• CPC Class Codes: B60N 2/075 roller-less
• CPC Class Codes: B60N 2/233 by linear screw mechanisms

Abstract

A power seat adjuster includes a rotatable drive shaft with first and second axial ends and an intermediate arcuate portion connecting the first and second axial ends. The first and second axial ends are respectively axially connected to a drive motor gear assembly and to a driven lead screw. A horizontal drive block threadingly engaging the lead screw is rotatably and vertically translatingly mounted in an aperture in a lower track for self-alignment of the drive block with respect to the lead screw. A housing rotatably receives the axial connection between one end of the drive shaft and the lead screw. The bearing block is rotatably and translatingly mounted in a bracket fixed to an upper track for self-alignment of the drive shaft with the lead screw. A drive block engages the lead screw and is mounted for rotation and translation in a link. The upper and lower tracks have a guide section and an abutment section which collapse together in a self-cinching action under force loading to resist separation of the upper and lower tracks.

Claims

1. A drive apparatus for a power seat adjuster having a first component movable relative to a second component comprising:

a rotatable drive shaft having first and second axial ends and an intermediate portion connecting the first and second axial ends;

a driven shaft;

means, adapted to be coupled to the driven shaft and the first component, for moving the first component relative to the second component upon rotation of the driven shaft;

the second end of the drive shaft co-axially connected to the driven shaft in a fixed connection for simultaneous rotation of the drive shaft and the driven shaft; and

means for rotating the first axial end of the drive shaft.

2. The drive apparatus of claim 1 wherein the drive shaft is flexible.

3. The drive apparatus of claim 2 wherein:

the first and second axial ends of the drive shaft are oriented non-co-axially with respect to each other.

4. The drive apparatus of claim 3 wherein:

the first and second axial ends of the drive shaft are oriented substantially perpendicular to each other.

5. The drive apparatus of claim 1 wherein the rotating means comprises:

a drive motor having a rotatable output shaft; and

gear means, coupled to and driven by the output shaft of the motor and connected to the first axial end of the drive shaft, for transmitting rotation of the output shaft of the motor to rotation of the drive shaft.

6. The drive apparatus of claim 1 further comprising:

means, adapted to be mounted on the first component, for rotatably housing the fixed connection between the drive shaft and the driven shaft.

7. A power seat adjuster for a vehicle comprising:

first and second track assemblies, each formed of a lower track adapted to be fixed on the vehicle and an upper track slidably mounted in the lower track;

drive motor means;

a first drive shaft coupled to the drive motor means and rotated by the drive motor means, the first drive shaft having first and second axial end portions and an intermediate portion connecting the first and second axial ends;

a first driven shaft;

means for co-axially connecting the second axial end of the first drive shaft to the first driven shaft in a fixed connection to transmit rotation of the drive shaft to the driven shaft; and

means, responsive to rotation of the driven shaft, for effecting relative movement of the upper track with respect to the lower track.

8. The power seat adjuster of claim 7 wherein:

the intermediate portion of the first drive shaft extends through a stationary structure on the power seat adjuster.

9. The power seat adjuster of claim 7 wherein the drive motor means comprises:

a drive motor having a rotatable output shaft; and

gear means, coupled to and driven by the output shaft of the motor, for rotating the first axial end of the drive shaft.

10. The power seat adjuster of claim 7 further comprising:

a pivotal seat back arm, movable with respect to a seat support;

second drive motor means;

a second drive shaft coupled to the second drive motor means and rotated by the second drive motor means, the second drive shaft having first and second axial end portions and an intermediate portion connecting the first and second axial ends;

a second driven shaft;

means for co-axially connecting the second axial end of the second drive shaft to one end of the second driven shaft in a fixed connection to transmit rotation of the second drive shaft to the second driven shaft;

means for rotatably mounting the fixed connection between the first axial end of the second drive shaft and the one end of the second driven shaft to the seat support;

a driven member coupled to the pivotal seat back arm and the second driven shaft, the driven member pivoting the seat back arm upon movement of the driven member; and

means, connected to the driven member, and engaging the second driven shaft, for transmitting rotation of the second driven shaft to movement of the driven member.

11. The power seat adjuster of claim 7 further comprising:

means, mounted on the upper track, for rotatably housing the fixed connection between the first drive shaft and the first driven shaft.

12. The power seat adjuster of claim 7 wherein the first drive shaft is a flexible shaft.

13. The power seat adjuster of claim 12 wherein:

the first and second axial ends of the drive shaft are oriented non-co-axially with respect to each other.

14. The power seat adjuster of claim 13 wherein the first and second axial ends of the first drive shaft are oriented substantially perpendicular to each other.

15. A power seat adjuster for a vehicle comprising:

first and second track assemblies, each formed of a lower track adapted to be fixed on the vehicle and an upper track slidably mounted in the lower track;

drive motor means;

a first drive shaft coupled to the drive motor means and rotated by the drive motor means, the first drive shaft having first and second axial end portions and an intermediate portion connecting the first and second axial ends;

a first driven shaft;

means for co-axially connecting the second axial end of the first drive shaft to the first driven shaft in a fixed connection to transmit rotation of the drive shaft to the driven shaft, the means for co-axially connecting including;

bracket means fixedly mounted to an upper track; and

a housing rotatably receiving a fixed connection between the second axial end of the first drive shaft and one end of the first driven shaft, the housing mounted in the bracket means; and

means, responsive to rotation of the driven shaft, for effecting relative movement of the upper track with respect to the lower track.

16. The power seat adjuster of claim 15 further comprising:

a second drive shaft coupled to the drive motor means and having first and second axial end portions interconnected by an intermediate portion;

a second driven shaft; and

means for co-axially connecting the second axial end of the second drive shaft to the second driven shaft in a fixed connection to transmit rotation of the second drive shaft to the second driven shaft.

17. The power seat adjuster of claim 16 wherein the drive motor means comprises:

a drive motor having a rotatable output shaft; and

gear means, driven by the output shaft of the drive motor, for rotating the first axial ends of the first drive shaft and the second drive shaft.

18. The power seat adjuster of claim 16 wherein the means for co-axially connecting the second axial end of the second drive shaft to the second driven shaft comprises:

another bracket means fixedly mounted to another upper track; and

another housing rotatably receiving the fixed connection between the second axial end of the second drive shaft to the end of the second driven shaft, the housing mounted in the bracket means.

19. The power seat adjuster of claim 18 wherein:

the first and the second drive shafts are flexible shafts.

20. The power seat adjuster of claim 19 wherein the first and second axial ends of both of the first drive shaft and the second drive shaft are oriented substantially perpendicular to each other.

21. The power seat adjuster of claim 20 wherein:

the intermediate portion of each of the first drive shaft and the second drive shaft extends through stationary structure on the power seat adjuster.

22. A seat back recliner for a vehicle having a seat back movable relative to a seat bottom, the seat bottom mounted on first and second track assemblies, each formed of a lower track adapted to be fixed to the vehicle and an upper track movably mounted on the lower track, the seat back recliner comprising:

a drive motor means;

a first drive shaft coupled to the drive motor means and rotated by the drive motor means, the first drive shaft having first and second axial end portions and an intermediate portion connecting the first and second axial ends;

a first driven shaft;

means for co-axially connecting the second axial end of the first drive shaft to one end of the first driven shaft in a fixed connection to transmit rotation of the first drive shaft to the driven shaft; and

means, adapted to be connected between the driven shaft and the seat back, for translating rotation of the driven shaft to pivotal movement of the seat back relative to the seat bottom.

23. The seat back recliner of claim 22 wherein:

the intermediate portion of the first drive shaft is adapted to extend through one of the first and second track assemblies.

24. The seat back recliner of claim 22 wherein the drive motor means comprises:

a drive motor having a rotatable output shaft; and

gear means, coupled to and driven by the output shaft of the motor, for rotating the first axial end of the drive shaft.

25. The seat back recliner of claim 22 wherein the translating means comprises:

means for rotatably mounting the connection between the first axial end of the first drive shaft and the one end of the driven shaft to one of the first and second track assemblies;

a driven member adapted to be pivotally coupled to the seat back, the driven member pivoting the seat back upon translation of the driven member; and

means, connected to the driven member and engaging the driven shaft, for transmitting rotation of the driven shaft to translation of the driven member.

26. The seat back recliner of claim 22 further comprising:

means, adapted to be mounted on one of the first and second track assemblies, for rotatably housing the fixed connection between the first drive shaft and the first driven shaft.

27. The seat back recliner of claim 22 wherein the first drive shaft is a flexible shaft.

28. The seat back recliner of claim 27 wherein:

the first and second axial ends of the first drive shaft are oriented non-co-axially with respect to each other.

29. The seat back recliner of claim 28 wherein the first and second axial ends of the first drive shaft are oriented substantially perpendicular to each other.

30. A seat back recliner for a vehicle having a seat back movable relative to a seat bottom, the seat bottom mounted on first and second track assemblies, each formed of a lower track adapted to be fixed to the vehicle and an upper track movably mounted on the lower track, the seat back recliner comprising:

a drive motor means;

a first drive shaft coupled to the drive motor means and rotated by the drive motor means, the first drive shaft having first and second axial end portions and an intermediate portion connecting the first and second axial ends;

a first driven shaft;

means for co-axially connecting the second axial end of the first drive shaft to one end of the first driven shaft in a fixed connection to transmit rotation of the first drive shaft to the driven shaft, the means for co-axially connecting including;

bracket means adapted to be fixedly mounted to one of the first and second track assemblies; and

a housing receiving a fixed connection between the second axial end of the first drive shaft and one end of the first driven shaft, the housing mounted in the bracket means; and

means, adapted to be connected between the driven shaft and the seat back, for translating rotation of the driven shaft to pivotal movement of the seat back relative to the seat bottom.