Method for installing a first machine part into a second machine part

Patent metadata

Field	Value
Publication number	US-9925610-B2
Application number	US-201314418600-A
Country	US
Kind code	B2
Filing date	Jul 24, 2013
Priority date	Jul 31, 2012
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A method for installing a first machine part into a second machine part includes press fitting the first machine part into the second machine part in its intended final position. The method also includes disposing an exothermically reactive substance on or in the first machine part and activating the exothermically reactive substance to cause a thermal structural change, stress relief, for example, in a part of the first machine part.

First claim

The invention claimed is:

1. A method comprising:
a) installing a first machine part, comprising a cylindrical wall having a top edge and a bottom edge and a flange projecting radially outward from the top edge and a base wall extending radially inward from the bottom edge, into an opening having a side wall in a second machine part in an intended final position such that the cylindrical wall forms a press fit with the side wall of the opening of the second machine part and such that the flange contacts the second machine part at a location outside the opening;
b) disposing an exothermically reactive substance on an upper surface of the flange or on a lower surface of the base wall; and
c) activating the exothermically reactive substance in order to cause a thermal structural change in a part of the first machine part.

2. The method according to claim 1 , wherein step b is performed before step a.

3. The method according to claim 1 , wherein step b is performed after step a.

4. The method according to claim 1 , wherein the thermal structural change is a stress relief heat treatment.

5. The method according to claim 1 , wherein the thermal structural change is part of a hardening process.

6. The method according to claim 1 , wherein the exothermically reactive substance is applied as a layer.

7. The method according to claim 1 , wherein the first machine comprises a bearing housing and a bearing including an inner ring, an outer ring and a plurality of rolling elements mounted in the housing.

8. The method according to claim 1 , wherein the exothermically reactive substance is disposed on or in the flange and the base wall.

9. The method according to claim 1 , wherein the cylindrical wall directly contacts the side wall of the opening of the second machine part.

10. The method according to claim 9 , wherein the exothermically reactive substance does extend between the cylindrical wall and the side wall of the opening.

11. The method according to claim 1 , wherein the cylindrical wall of the first machine part is metal.

12. The method according to claim 1 , wherein the installing creates a stress in the first machine part and wherein the thermal structural change comprises a relief of the stress.

13. A method for installing a bearing unit in an opening in a body, the opening having a side wall, the method comprising:
a) press-fitting the bearing unit in the opening in an intended final position, the bearing unit comprising a housing having a cylindrical wall having an inner surface and an outer surface and a bearing comprising an outer ring in contact with the inner surface, the bearing further including an inner ring and a plurality of rolling elements,
b) applying an amount of exothermically reactive substance to the bearing unit housing at a location spaced from the cylindrical side wall, and
c) relieving stress in the bearing unit by activating the exothermically reactive substance to cause a thermal structural change in the housing.

14. The method according to claim 13 ,
wherein the bearing housing includes a flange projecting radially outward from a first edge of the cylindrical wall and a base wall projecting radially inward from a second edge of the cylindrical wall,
wherein the flange contacts the body, and
wherein the exothermically reactive substance is applied to the flange or to the base wall.

15. The method according to claim 13 , wherein the outer surface of the cylindrical wall directly contacts the body.

16. The method according to claim 15 , wherein the exothermically reactive substance does extend between the outer surface of the cylindrical wall and the side wall of the opening in the second machine part.

17. The method according to claim 13 , wherein the housing is metal.

18. The method according to claim 17 , wherein the housing includes a flange projecting radially outward from the cylindrical side wall, the flange directly contacting the body at a location outside the opening and the method including disposing the exothermically reactive substance on the flange.

19. The method according to claim 13 , wherein the press fitting creates a stress in the bearing unit and wherein the thermal structural change comprises a relief of the stress.

20. A method comprising:
providing a housing comprising a cylindrical side wall having an inner surface and an outer surface and a base wall extending radially inward from a first edge of the cylindrical side wall, the base wall having an inner surface and an outer surface, the inner surface of the cylindrical side wall and the inner surface of the base wall defining a housing interior,
inserting the housing base-wall-first into an opening in a body such that the outer surface of the cylindrical side wall directly contacts and forms a press fit with the opening, the inserting creating a stress in the housing,
disposing an exothermically reactive substance on the outer surface of the base wall, and
at least partially relieving the stress by activating the exothermically reactive substance.

Assignees

• Skf Ab

Inventors

• Friedrich Hans-Juergen
• Hauck Helmut

Classifications

• B23K1/0006 Primary

  Exothermic brazing · CPC title

• F16C19/06

  with a single row or balls · CPC title

• C21D1/18

  Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) · CPC title

• F16C19/54

  Systems consisting of a plurality of bearings with rolling friction (spindle bearings F16C35/08) · CPC title

• F16C35/077 Primary

  between housing and outer race ring · CPC title