SPRING HOOK WEAR BUSHING AND LINKAGE ASSEMBLY INCLUDING THE SPRING HOOK WEAR BUSHING

• US 20090293226A1
• Filed: 05/30/2008
• Published: 12/03/2009
• Est. Priority Date: 05/30/2008
• Status: Abandoned Application

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Graham, Gary W., Widemark, Gerald A.
• Application Number:
  US12/129,988
• Publication Number:
  US 20090293226A1
• Time in Patent Office: Days
• US Class Current: 16/2.1
• CPC Class Codes: F16C 17/10 for both radial and axial load
• CPC Class Codes: F16C 33/201 Composition of the plastic
• CPC Class Codes: F16H 21/44 for conveying or interconverting oscillating or reciprocating motions
• CPC Class Codes: Y10T 74/1896 Cam connections

Abstract

A spring-hook wear bushing and actuator linkage assembly including the spring-hook wear bushing is provided. The wear bushing includes a cylindrical body having an annular external surface and including a first end and a second end. A bore is formed axially through the cylindrical body and extending from the first end to the second end. A channel is defined in the annular external surface of the cylindrical body and extending annular about the cylindrical body. The channel defines a running surface bounded by a plurality of annular retaining shoulders configured to retain therein a spring-hook of an actuator linkage assembly. The actuator linkage assembly is used for controlling a valve assembly.

Claims

1. A wear bushing comprising:

a cylindrical body having an annular external surface and including a first end and a second end;

a bore formed axially through the cylindrical body and extending from the first end to the second end; and

a channel formed in the annular external surface of the cylindrical body and extending annular about the cylindrical body,

wherein the channel defines a running surface bounded by a plurality of annular retaining shoulders configured to retain therein a spring-hook.

2. A wear bushing as claimed in claim 1, wherein the wear bushing is formed of a composite material.

3. A wear bushing as claimed in claim 2, wherein the wear bushing is formed of a polyimide.

4. A wear bushing as claimed in claim 3, wherein the wear bushing is formed of a molded polyimide.

5. A wear bushing as claimed in claim 3, wherein the wear bushing is formed of a machined polyimide.

6. A wear bushing comprising:

a cylindrical body having an annular external surface and including a first end and a second end, the cylindrical body formed of a composite material;

a bore formed axially through the cylindrical body and extending from the first end to the second end; and

a channel formed in the annular external surface of the cylindrical body and extending annular about the cylindrical body,

wherein the channel defines a running surface bounded by a plurality of annular retaining shoulders configured to retain therein a spring-hook.

7. A wear bushing as claimed in claim 6, wherein the wear bushing is formed of a polyimide.

8. A wear bushing as claimed in claim 7, wherein the wear bushing is formed of a molded polyimide.

9. A wear bushing as claimed in claim 7, wherein the wear bushing is formed of a machined polyimide.

10. An actuator linkage assembly for use in controlling a valve, the actuator linkage assembly comprising:

a linear moveable element configured to receive a linear movement;

an actuator link including an arm actuating assembly coupled to the linea moveable element;

a feedback arm coupled to the actuator link via a helical extension spring including a spring-hook, the actuator link and the arm actuating assembly configured to transform the linear movement of the linear moveable element into a rotational movement via the feedback arm, the feedback arm including a mounting pin having a wear bushing disposed thereon, the wear bushing comprising;

a cylindrical body having an annular external surface and including a first end and a second end;

a bore formed axially through the cylindrical body and extending from the first end to the second end;

a channel formed in the annular external surface of the cylindrical body and extending annular about the cylindrical body,

wherein the channel defines a running surface bounded by a plurality of annular retaining shoulders configured to retain therein the spring-hook.

11. The actuator linkage assembly of claim 10, wherein the linear moveable element is a moving canister driven by a pressurized bladder.

12. The actuator linkage assembly of claim 10, wherein the mounting pin is a machine screw positioned within a bore formed in the feedback arm.

13. The actuator linkage assembly of claim 10, wherein the mounting pin is a pin-shaped component fixedly mounted to the feedback arm.

14. The actuator linkage assembly of claim 10, further including a locking means disposed on an end of the mounting pin, thereby locking the mounting pin in position relative to the feedback arm.

15. The actuator linkage assembly of claim 14, wherein the locking means is a self-locking nut.

16. The actuator linkage assembly of claim 10, further including a retaining sleeve disposed on the mounting pin to retain position of the wear bushing relative to the mounting pin.

17. The actuator linkage assembly of claim 10, wherein the wear bushing is formed of a composite material.

18. The actuator linkage assembly of claim 17, wherein the wear bushing is formed of a polyimide material.

19. The actuator linkage assembly of claim 18, wherein the wear bushing is formed of a molded polyimide material.

20. The actuator linkage assembly of claim 18, wherein the wear bushing is formed of a machined polyimide material.