Steering position rotary sensor assembly

Patent metadata

Field	Value
Publication number	US-11060886-B2
Application number	US-201816214487-A
Country	US
Kind code	B2
Filing date	Dec 10, 2018
Priority date	Dec 10, 2018
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

Embodiments herein are directed to steering position rotary sensors including a housing defining an internal cavity, a center shaft extending through the housing, and a gear coupled to the center shaft, wherein the gear is positioned off-center relative to a central rotational axis extending through the center shaft. The steering position rotary sensor may further include a magnet coupled to the gear, a first Hall effect sensor positioned adjacent the gear and concentric with the magnet, and a second Hall effect sensor positioned adjacent the center shaft and concentric with the central rotational axis, wherein the first Hall effect sensor and the second Hall effect sensor are separated by a magnetic shield.

First claim

What is claimed is:

1. An assembly comprising:
a housing;
a center shaft extending through the housing a gear coupled to the center shaft, the gear positioned off-center relative to a central rotational axis extending through the center shaft;
a magnet coupled to the gear;
a first Hall effect sensor positioned adjacent the gear and concentric with the magnet;
a second Hall effect sensor positioned adjacent the center shaft and concentric with the central rotational axis, wherein the first Hall effect sensor and the second Hall effect sensor are separated by a magnetic shield in direct contact with an exterior surface of the gear, and wherein the magnetic shield extends concentrically about the magnet along the exterior surface of the gear; and
a printed circuit board (PCB) within the housing, wherein the first Hall effect sensor and the second Hall effect sensor are directly coupled to an internal side of the PCB.

2. The assembly of claim 1 , further comprising a third Hall effect sensor.

3. The assembly of claim 2 , wherein the third Hall effect sensor is directly coupled to an external side of the PCB, and wherein the third Hall effect sensor is concentric with the central rotational axis.

4. The assembly of claim 1 , wherein the center shaft includes a second magnet.

5. The assembly of claim 1 , wherein the gear and the center shaft interact to provide a gear reduction of approximately 4:1.

6. A steering position rotary sensor assembly comprising:
a housing defining an internal cavity;
a center shaft extending through the housing;
a gear coupled to the center shaft, the gear positioned off-center relative to a central rotational axis extending through the center shaft;
a magnet coupled to the gear;
a first Hall effect sensor positioned adjacent the gear and concentric with the magnet;
a second Hall effect sensor positioned adjacent the center shaft and concentric with the central rotational axis, wherein the first Hall effect sensor and the second Hall effect sensor are separated by a magnetic shield in direct contact with an exterior surface of the gear, and wherein the magnetic shield extend concentrically about the magnet along the exterior surface of the gear; and
a printed circuit board (PCB) within the internal cavity of the housing, wherein the PCB includes an internal side and an external side, and wherein the first Hall effect sensor and the second Hall effect sensor are directly coupled to the internal side.

7. The steering position rotary sensor assembly of claim 6 , further comprising a third Hall effect sensor, wherein the third Hall effect sensor is directly coupled to the external side of the PCB, and wherein the third Hall effect sensor is concentric with the central rotational axis.

8. The steering position rotary sensor assembly of claim 6 , wherein the center shaft includes a second magnet.

9. The steering position rotary sensor assembly of claim 6 , wherein the gear and the center shaft interact to provide a gear reduction of approximately 4:1.

10. A steering position rotary sensor assembly comprising:
a housing defining an internal cavity;
a center shaft extending through the housing;
a gear coupled to the center shaft, the gear positioned off-center relative to a central rotational axis extending through the center shaft;
a magnet affixed to the gear, the magnet positioned within the internal cavity of the housing;
a first Hall effect sensor positioned adjacent the gear and concentric with the magnet;
a second Hall effect sensor positioned adjacent the center shaft and concentric with the central rotational axis, wherein the first Hall effect sensor and the second Hall effect sensor are separated by a magnetic shield in direct contact with an exterior surface of the gear, and wherein the magnetic shield extends concentrically about the magnet along the exterior surface of the gear; and
a printed circuit board (PCB) within the internal cavity of the housing, wherein the PCB includes an internal side and an external side, and wherein the first Hall effect sensor and the second Hall effect sensor are directly coupled to the internal side.

11. The steering position rotary sensor assembly of claim 10 , further comprising a third Hall effect sensor, wherein the third Hall effect sensor is directly coupled to the external side of the PCB, and wherein the third Hall effect sensor is concentric with the central rotational axis.

12. The steering position rotary sensor assembly of claim 11 , wherein the center shaft includes a second magnet.

Assignees

• Littelfuse Inc

Inventors

• Kruger Jay

Classifications

• G01D2205/26

  Details of encoders or position sensors specially adapted to detect rotation beyond a full turn of 360°, e.g. multi-rotation · CPC title

• G01D5/145 Primary

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title

• G01D5/04 Primary

  using levers; using cams; using gearing · CPC title

• G01D2205/28

  The target being driven in rotation by additional gears · CPC title

• B62D15/02 Primary

  Steering position indicators {; Steering position determination; Steering aids} · CPC title