Sheave with structured web

Patent metadata

Field	Value
Publication number	US-10047848-B2
Application number	US-201514795958-A
Country	US
Kind code	B2
Filing date	Jul 10, 2015
Priority date	Jul 10, 2014
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A sheave may include a body portion with a circular circumference and defining a center plane, a bore extending through the body portion and configured for receiving a shaft and allowing the body portion to rotate in the center plane, and a rope groove arranged on the circular circumference, wherein, the body portion comprises a structured profile.

First claim

What is claimed is:

1. A sheave, comprising:
a body portion with a circular circumference and defining a center plane;
a bore extending through the body portion and configured for receiving a shaft and allowing the body portion to rotate in the center plane; and
a rope groove arranged on the circular circumference,
wherein, the body portion comprises a substantially continuous structured web having, when viewed in cross-section, a substantial structural profile near the bore and a diminishing structural profile as the web approaches the circular circumference.

2. The sheave of claim 1 , wherein the structured profile extends substantially throughout a radial length of the body portion.

3. The sheave of claim 1 , wherein the structured profile defines a section modulus and the section modulus increases as the body portion approaches the bore.

4. The sheave of claim 1 , wherein the structured profile comprises a triangular profile.

5. The sheave of claim 1 , wherein the structured profile comprises a smooth curve.

6. The sheave of claim 5 , wherein the structured profile comprises a sinusoidal curve.

7. The sheave of claim 1 , wherein the structured profile comprises a square profile.

8. The sheave of claim 1 , wherein the structured profile comprises a trapezoidal profile.

9. The sheave of claim 1 , wherein the structured profile comprises line segments at alternating heights.

10. The sheave of claim 1 , wherein the structured profile comprises a combination of profile elements selected from triangular, smooth curve, square, trapezoidal, line segments with alternating heights, and straight profiles.

11. A sheave, comprising:
a body portion with a circular outer portion and an inner portion, the body portion having a circumference and defining a center plane, the body portion comprising a plurality of planar radial sections cantilevering from the inner portion to the outer portion and having a surface normal directed generally lateral to the center plane;
a bore extending through the body portion and configured for receiving a shaft and allowing the body portion to rotate in the center plane; and
a rope groove arranged on the circumference of the body portion.

12. The sheave of claim 11 , wherein the rope groove comprises a body portion having a bottom surface, wherein the plurality of radial sections abut a portion of the bottom surface.

13. The sheave of claim 11 , wherein the plurality of radial sections cantilever at an angle measured from the center plane.

14. The sheave of claim 13 , wherein the radial sections cantilever from a point offset from the center plane on the inner portion and toward the center plane as the radial sections approach the outer portion, the radial sections alternating such that the point for each radial section is on an opposing side of the center plane when compared to a corresponding point for an adjacent section.

15. The sheave of claim 14 , wherein the rope groove comprises a body portion having a bottom surface, wherein the plurality of radial sections abut a portion of the bottom surface.

16. A web for sheave, comprising:
a body portion with a circular circumference and defining a center plane; and
a bore extending through the body portion and configured for receiving a shaft and allowing the body portion to rotate in the center plane;
wherein, the body portion comprises a substantially continuous structured web having, when viewed in cross-section, a substantial structural profile near the bore and a diminishing structural profile as the web approaches the circular circumference.

17. The web of claim 16 , wherein the structured profile extends substantially throughout a radial length of the body portion.

18. The web of claim 16 , wherein the structured profile defines a section modulus and the section modulus increases as the body portion approaches the bore.

19. The web of claim 16 , wherein the structured profile comprises a triangular profile.

20. The web of claim 16 , wherein the structured profile comprises a smooth curve.

Assignees

• Nat Oilwell Varco Lp

Inventors

• Kaybidge Reece William
• Liu Li

Classifications

• F16H57/01

  Monitoring wear or stress of gearing elements, e.g. for triggering maintenance · CPC title

• F16H55/50 Primary

  Features essential to rope pulleys · CPC title