Torque sensor rotor

• US 8,776,618 B2
• Filed: 06/21/2013
• Issued: 07/15/2014
• Est. Priority Date: 04/25/2011
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Lee, Changhwan
• Primary Examiner(s): Caputo, Lisa
• Assistant Examiner(s): WILLIAMS, JAMEL E
• Application Number:
  US13/923,865
• Publication Number:
  US 20130276551A1
• Time in Patent Office: 389 Days
• Field of Search: 738/621.91, 738/620.8
• US Class Current: 73/862.191
• CPC Class Codes: G01L 25/003 for measuring torque
• CPC Class Codes: G01L 3/04 wherein the torque-transmitting element comprises a torsionally-flexible shaft
• CPC Class Codes: G01L 3/104 involving permanent magnets

Abstract

Disclosed is a rotor for a torque sensor configured to improve a mechanical coupling force with respect to a jig in a process of adjusting a torque center, thus enabling a fine adjustment, the rotor including a rotor body having a sleeve coupled to a rotating shaft and a yoke protruding from an outer circumference of the sleeve, a ring-shaped magnet coupled to an outer circumference of the yoke, and an anti-slip structure formed on the rotor body and partially coming into contact with a jig during a rotating process for adjusting a torque center, thus inhibiting slipping between the rotor body and the jig when a rotating force is transmitted, so that slipping between the jig and the rotor body is inhibited to enable precise transmission of the rotating force whereby accuracy is improved during fine adjustment of the torque center.

Claims

1. A rotor for a torque sensor comprising:

a sleeve having a first outer circumference;

a yoke having a second outer circumference, the second outer circumference of the yoke being greater than the first circumference and the yoke being provided below the sleeve;

a serrated portion having first and second surfaces and a third outer circumference, a plurality of serrations provided on the first surface and the second surface being in contact with the yoke; and

a magnet provided around the second outer circumference of the yoke and having a fourth outer circumference which is larger than the third outer circumference of the serrated portion.

2. The rotor of claim 1, wherein the sleeve, yoke, serrated portion and magnet have a circular shape and a center of the sleeve, yoke, serrated portion and magnet are aligned in a first direction.

3. The rotor of claim 2, wherein the first direction is a direction of a shaft provided through an inner circumference of the sleeve and the yoke.

4. The rotor of claim 1, wherein at least one hole is provided on a side surface of the sleeve, the first outer circumference being defined by the side surface of the sleeve.

5. The rotor of claim 1, wherein the second and third circumferences are the same.

6. The rotor of claim 1, wherein the magnet contacts the outer circumference of the yoke.

7. The rotor of claim 1, wherein the difference in the first outer circumference of the sleeve and the second outer circumference of the yoke results in a ledge being provided on the yoke, and the serrated portion is provided on the ledge.

8. The rotor of claim 1, wherein the yoke extend from a lower end of the sleeve.

9. The rotor of claim 8, wherein the yoke is integrated with the sleeve.

10. The rotor of claim 1, wherein the magnet comprises a plurality of segmented arc-shaped magnets.

11. The rotor of claim 1, wherein the first surface of the serrated portion is a top surface and the second surface of the serrated portion is a bottom surface.

12. A rotor for a torque sensor comprising:

a sleeve having a first outer circumference defined by a side surface of the sleeve and at least one hole provided on the side surface and configured for coupling to a jig;

a yoke having a second outer circumference, the second outer circumference of the yoke being greater than the first circumference and the yoke being provided below the sleeve; and

a magnet provided around the second outer circumference of the yoke and having a third outer circumference which is larger than the second outer circumference of the yoke.

13. The rotor of claim 12, wherein the sleeve, yoke and magnet having a circular shape and a center of the sleeve, yoke and magnet are aligned in a first direction.

14. The rotor of claim 13, wherein the first direction is a direction of a shaft provided through an inner circumference of the sleeve and the yoke.

15. The rotor of claim 12, wherein the magnet contacts the outer circumference of the yoke.

16. The rotor of claim 12, wherein the yoke extend from a lower end of the sleeve.

17. The rotor of claim 16, wherein the yoke is integrated with the sleeve.

18. The rotor of claim 12, wherein the magnet comprises a plurality of segmented arc-shaped magnets.