Integral housing load cell system and apparatus

• US 9,297,712 B2
• Filed: 07/03/2013
• Issued: 03/29/2016
• Est. Priority Date: 07/03/2013
• Status: Active Grant

• Current Assignee: Goodrich Corporation (Rtx Corporation)
• Original Assignee: Goodrich Corporation (Rtx Corporation)
• Inventors: Freshour, Thomas
• Primary Examiner(s): Noori, Max
• Application Number:
  US13/934,558
• Publication Number:
  US 20150008800A1
• Time in Patent Office: 1,000 Days
• Field of Search: 737/60, 738/55, 738/56
• US Class Current: 1/1
• CPC Class Codes: F16D 65/18 adapted for drawing members together , e.g. for disc brakes
• CPC Class Codes: G01L 1/22 using resistance strain gauges
• CPC Class Codes: G01L 3/108 involving resistance strain gauges
• CPC Class Codes: H02K 11/24 Devices for sensing torque, or actuated thereby H02K11/27 takes precedence

Abstract

A strain gage system for an electric motor actuator is provided. The strain gage system may be coupled to or integrally formed in a housing of the electric motor actuator. In various embodiments, the strain gauge system may comprise one or more principle strain gages. In various embodiments, the strain gage system may comprise one or more transverse strain gages.

Claims

1. An electric motor actuator for a brake system, comprising:

a housing comprising an outer surface, and having a first length along a first housing axis, a second length along a second housing axis orthogonal to the first housing axis, and a third length along a third housing axis, orthogonal to the first housing axis and the second housing axis, the electric motor actuator configured to couple to a pressure generating device of the brake system to receive tensioning along the first housing axis by the brake system;

a first strain gage installed on the outer surface of the housing; and

a second strain gage installed on the outer surface of the housing, wherein the first strain gage is installed on the outer surface of the housing 180°

degrees from the second strain gage, wherein the first strain gage and the second strain gage are configured to measure tensioning along the first housing axis imparted by the brake system.

2. The electric motor actuator of claim 1, wherein the housing further comprises a first flange and a second flange.

3. The electric motor actuator of claim 2, wherein the housing has a substantially cylindrical body portion.

4. The electric motor actuator of claim 3 further comprising a cover.

5. The electric motor actuator of claim 4, wherein the cover is installable on the housing and coupled to the housing with a collar.

6. The electric motor actuator of claim 3, wherein a first axis of the first strain gage is centered in line with the first flange and wherein the first strain gage is installed between the first flange and the cover.

7. The electric motor actuator of claim 1 further comprising a third strain gage and a fourth strain gage.

8. The electric motor actuator of claim 7, wherein the third strain gage comprises a third axis that is oriented transverse to the first axis of the first strain gage.

9. The electric motor actuator of claim 7, wherein the fourth strain gage comprises a fourth axis that is oriented transverse to a second axis of the second strain gage.

10. The electric motor actuator of claim 7, wherein the housing further comprises a first flange and a second flange, and wherein the third strain gage is installed between the first strain gage and the first flange.

11. A strain gauge system for an electric motor actuator of a brake system, comprising:

a housing comprising a housing outer surface and a first flange coupled to the housing outer surface;

a first strain gage assembly installable on the housing outer surface, wherein the first flange and the first strain gage assembly are centered on a first axis of the housing and wherein a portion of the first strain gage assembly is coupled to the housing outer surface at a first distance from the first flange;

a wiring terminal in electronic communication with the first strain gauge assembly; and

a wire configured to connect the first strain gage assembly to the wiring terminal, wherein the electric motor actuator is configured to couple to a pressure generating device of the brake system, wherein the first strain gage assembly is configured to measure tensioning imparted by the brake system along a second axis of the housing, orthogonal to the first axis of the housing.

12. The strain gauge system of claim 11, further comprising a second strain gage assembly, wherein the housing outer surface comprises a second flange.

13. The strain gauge system of claim 12, wherein the second strain gage assembly is installable on the housing outer surface and is centered on the second flange.

14. The strain gauge system of claim 11, wherein the first strain gage assembly comprises a first principle strain gage and a first transverse strain gage.

15. The strain gauge system of claim 14, wherein the first principle strain gage is configured to measure a linear load on the housing.

16. The strain gauge system of claim 14, wherein the first transverse strain gage is configured to measure a bending load on the housing.

17. An electric motor actuator for a brake system, comprising:

A cylindrical housing comprising a housing outer surface and a first end and a second end aligned along a cylindrical axis, the first end having a first flange and a second flange;

a cover removably coupled to the second end;

a first principle strain gage installed between the first flange and the second end on the housing outer surface; and

a second principle strain gage installed between the second flange and the second end on the housing outer surface wherein the first principle strain gage and the second principle strain gage are configured to measure tensioning along the cylindrical axis imparted by the brake system.

18. The electric motor actuator of claim 17, further comprising a first transverse strain gauge installed adjacent to the first principle strain gage and a second transverse strain gage installed adjacent to the second principle strain gauge.

19. The electric motor actuator of claim 18, wherein the first principle strain gage and the second principle strain gage are configured to measure linear load on the housing.

20. The electric motor actuator of claim 19, wherein the first transverse strain gage and the second transverse strain gage are configured to measure a bending load on the housing, and wherein at least a portion of the bending load is used to normalize the linear load.