Compactor tip with heated retention bolt

Patent metadata

Field	Value
Publication number	US-11898588-B2
Application number	US-202016801292-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Feb 26, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A tip assembly includes a tip including a body having a narrow tip portion, a broad attachment portion that defines a concave surface, an interior disposed between the broad attachment portion and the narrow tip portion, and a cavity that leads from the concave surface toward the interior. A retention bolt that is heated includes a tapered region, and a shaft extending from the tapered region, terminating at an externally threaded end. The cavity of the tip is at least partially complimentarily shaped to the tapered region of the retention bolt.

First claim

What is claimed is:

1. A compactor wheel assembly comprising:
a wheel including an aperture extending radially through an outside surface of the wheel;
a tip including a cavity that is aligned with the aperture of the wheel, the cavity including:
a first interior portion, and
a second interior portion that has a width that is less than a width of the first interior portion of the cavity; and

a retention bolt disposed in the cavity of the tip and extending from the cavity of the tip through the aperture of the wheel to attach the tip to the wheel, the retention bolt including:
an end portion that is disposed in the first interior portion of the cavity, and
a shaft portion that has a width that is less than a width of the end portion of the retention bolt,
wherein the shaft portion of the retention bolt is disposed in the second interior portion of the cavity, and
wherein the shaft portion of the retention bolt and the second interior portion of the cavity are shaped to prevent rotation of the shaft portion of the retention bolt relative to the second interior portion of the cavity.

2. The compactor wheel assembly of claim 1 , wherein the end portion of the retention bolt includes a tapered portion, and
wherein the first interior portion of the cavity includes an interior tapered portion.

3. The compactor wheel assembly of claim 2 , wherein the second interior portion of the cavity extends from the first interior portion of the cavity to an exterior of the tip, and
wherein the shaft portion of the retention bolt extends radially inwardly through the second interior portion of the cavity of the tip and through the wheel.

4. The compactor wheel assembly of claim 3 , wherein the shaft portion of the retention bolt terminates at a cylindrical free end that is disposed radially inwardly of the outside surface of the wheel.

5. The compactor wheel assembly of claim 4 , wherein the cylindrical free end of the retention bolt includes an externally threaded portion, and
wherein the compactor wheel assembly further comprises a nut threaded onto the externally threaded portion of the cylindrical free end.

6. The compactor wheel assembly of claim 5 , further comprising a load washer disposed radially between an inner concave surface of the wheel and the nut.

7. The compactor wheel assembly of claim 4 , further comprising a heat transfer element that contacts the cylindrical free end of the retention bolt.

8. The compactor wheel assembly of claim 7 , wherein the heat transfer element is an induction heating element that is connected to an electrical conduit.

9. A tip assembly comprising:
a tip including:
an upper portion,
a lower attachment portion that has a width that is larger than a width of the upper portion of the tip, and
a cavity that leads from the lower attachment portion of the tip toward the upper portion of the tip, the cavity including:
a first interior portion, and
a second interior portion,
wherein the second interior portion of the cavity has a width that is less than a width of the first interior portion of the cavity; and

a retention bolt including:
an end portion that is configured to be disposed in the first interior portion of the cavity, and
a shaft portion,
wherein the shaft portion of the retention bolt has a width that is less than a width of the end portion of the retention bolt,
wherein the shaft portion of the retention bolt is disposed in the second interior portion of the cavity,
wherein the shaft portion of the retention bolt and the second interior portion of the cavity are shaped to prevent rotation of the shaft portion of the retention bolt relative to the second interior portion of the cavity,
wherein the shaft portion of the retention bolt extends from the end portion of the retention bolt, and
wherein the shaft portion of the retention bolt terminates at an externally threaded end.

10. The tip assembly of claim 9 , wherein the end portion of the retention bolt includes a hex head or a tapered head.

11. The tip assembly of claim 10 , wherein the shaft portion of the retention bolt is complimentarily shaped to the second interior portion of the cavity, and
wherein the second interior portion of the cavity extends to the lower attachment portion of the tip.

12. The tip assembly of claim 11 , further comprising a nut that is configured to be threaded onto the externally threaded end of the retention bolt.

13. The tip assembly of claim 12 , further comprising a load washer configured to receive the shaft portion of the retention bolt.

14. The tip assembly of claim 11 wherein the first interior portion the cavity end portion of the retention bolt are tapered.

15. The tip assembly of claim 9 , further comprising an induction heat element that contacts the externally threaded end of the retention bolt.

16. A method for attaching a tip to a wheel comprising:
attaching a retention fastener to a cavity of a tip,
wherein the cavity of the tip includes:
a first interior portion, and
a second interior portion that has a width that is less than a width of the first interior portion of the cavity, and

wherein the retention fastener includes:
an end portion that is disposed in the first interior portion of the cavity, and
a shaft portion that has a width that is less than a width of the end portion of the retention fastener,
wherein the shaft portion of the retention fastener is disposed in the second interior portion of the cavity, and
wherein the shaft portion of the retention bolt and the second interior portion of the cavity are shaped to prevent rotation of the shaft portion of the retention bolt relative to the second interior portion of the cavity;

inserting the retention fastener through an aperture in the wheel; and
heating or cooling the retention fastener.

17. The method of claim 16 , wherein the step of heating or cooling the retention fastener includes heating the retention fastener to lengthen the retention fastener.

18. The method of claim 17 , further comprising torquing a nut on a threaded end of the retention fastener,
wherein the threaded end of the retention fastener is part of the shaft portion of the retention fastener.

19. The method of claim 18 , further comprising ceasing to heat the retention fastener to allow the retention fastener to contract.

20. The method of claim 16 , wherein the step of heating or cooling the retention fastener includes cooling the retention fastener to shrink the retention fastener.

21. A retention bolt assembly comprising:
a retention bolt including:
an end portion; and
a shaft portion extending from the end portion of the retention bolt,
wherein the shaft portion of the retention bolt has a width that is less than a width of the end portion of the retention bolt,
wherein the shaft portion of the retention bolt is configured to be received within a cavity of a tip and is shaped to be prevented from rotating relative to the cavity of the tip, and
wherein the shaft portion of the retention bolt terminates at an externally threaded end; and

a heat transfer element contacting the externally threaded end of the retention bolt,
wherein the heat transfer element is configured to at least one of:
heat the retention bolt to cause the retention bolt to lengthen, or
cool the retention bolt to cause the retention bolt to contract.

22. A tip for connection to a wheel of a compactor wheel assembly, the tip comprising:
a body including,
an

Assignees

• Caterpillar Inc

Inventors

• Serrurier Douglas C

Classifications

• F16B33/002 Primary

  Means for preventing rotation of screw-threaded elements (F16B39/00 takes precedence) · CPC title

• B60B15/08

  with spade lugs axially displaced relatively to the tread surface of the tyre · CPC title

• E02D3/0265 Primary

  Wheels specially adapted therefor; Cleats for said wheels · CPC title

• F16B31/04

  for maintaining {a} tensile load · CPC title

• F16B43/02

  with special provisions for engaging surfaces which are not perpendicular to a bolt axis or do not surround the bolt · CPC title