Sliding bearing, method for producing a sliding bearing, internal combustion engine having a sliding bearing and electric machine having a sliding bearing

Patent metadata

Field	Value
Publication number	US-11619258-B2
Application number	US-202117191680-A
Country	US
Kind code	B2
Filing date	Mar 3, 2021
Priority date	Mar 4, 2020
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

A sliding bearing may include an uncoated shaft and a bearing bush. The uncoated shaft may include a shaft material. The bearing bush may include a sintered bearing bush material. The shaft may be slidingly and moveably guided, relative to the bearing bush, within the bearing bush. The bearing bush material may have a residual porosity of 8 percent or more. A volume of the residual porosity may be filled with an oil up to 80 percent or more.

First claim

The invention claimed is:

1. A sliding bearing, comprising:
an uncoated shaft including a shaft material;
a bearing bush including a sintered bearing bush material, the shaft slidingly and moveably guided, relative to the bearing bush, within the bearing bush;
wherein the bearing bush material has a residual porosity of 8 percent or more; and
wherein a volume of the residual porosity is filled with an oil up to 80 percent or more.

2. The sliding bearing according to claim 1 , wherein the volume of the residual porosity is filled up to 90 percent or more with the oil.

3. The sliding bearing according to claim 1 , wherein the bearing bush material has a composition including:
1.8 to 2.2 percent by weight of carbon;
0.2 to 0.5 percent by weight of phosphorus;
3.5 to 5 percent by weight of copper;
0.4 to 0.6 percent by weight of tin; and
a residual component.

4. The sliding bearing according to claim 3 , wherein the residual component includes 26.315 percent by weight to 96.9 percent by weight of iron.

5. The sliding bearing according to claim 3 , wherein the residual component includes iron and contaminations.

6. The sliding bearing according to claim 3 , wherein a remaining weight content of the residual component is formed by iron.

7. The sliding bearing according to claim 1 , wherein the bearing bush material has a composition including:
0.8 to 1.3 percent by weight of carbon;
0.2 to 0.4 percent by weight of sulphur;
1.3 to 2.5 percent by weight of nickel;
0.8 to 1.2 percent by weight of molybdenum;
0 to 0.5 percent by weight of manganese; and
a residual component.

8. The sliding bearing according to claim 1 , wherein the sintered bearing bush material has a density of 6.2 to 6.8 g/cm 3 .

9. The sliding bearing according to claim 1 , wherein the shaft material has a composition including:
0.4 to 0.5 percent by weight of carbon;
2.7 to 3.3 percent by weight of silicon;
0 to 0.6 percent by weight of manganese;
8 to 10 percent by weight of chromium;
0 to 0.5 percent by weight of nickel;
0 to 0.04 percent by weight of phosphorus;
0 to 0.03 percent by weight of sulphur; and
a residual component.

10. The sliding bearing according to claim 1 , wherein the shaft material has a composition including:
0.45 to 0.55 percent by weight of carbon;
0 to 0.45 percent by weight of silicon;
8 to 10 percent by weight of manganese;
20 to 22 percent by weight of chromium;
3.5 to 5.5 percent by weight of nickel;
0 to 0.04 percent by weight of phosphorus;
0 to 0.03 percent by weight of sulphur;
0.4 to 0.6 percent by weight of nitrogen;
1.8 to 2.5 percent by weight of niobium;
0.8 to 1.5 percent by weight of tungsten; and
a residual component.

11. The sliding bearing according to claim 1 , wherein the shaft material has a composition including:
0 to 0.08 percent by weight of carbon;
0 to 0.5 percent by weight of silicon;
0 to 0.5 percent by weight of manganese;
13.5 to 15.5 percent by weight of chromium;
30 to 33.5 percent per by weight of nickel;
0 to 0.015 percent by weight of phosphorus;
0 to 0.01 percent by weight of sulphur;
1.6 to 2.2 percent by weight of aluminium;
0.4 to 0.9 percent by weight of niobium;
2.3 to 2.9 percent by weight of titanium;
0.4 to 1.0 percent by weight of molybdenum; and
a residual component.

12. The sliding bearing according to claim 1 , wherein the shaft material has a composition including:
0.25 to 0.35 percent by weight of carbon;
0 to 0.3 percent by weight of silicon;
4 to 6 percent by weight of manganese;
24 to 26 percent by weight of chromium;
10 to 13 percent by weight of nickel;
0 to 0.2 percent by weight of phosphorus;
0 to 0.2 percent by weight of sulphur;
0 to 0.5 percent by weight of aluminium;
0 to 0.5 percent by weight of copper;
1.8 to 2.5 percent by weight of niobium;
0.5 to 0.7 percent by weight of nitrogen; and
a residual component.

13. The sliding bearing according to claim 1 , wherein the shaft material has a composition including:
0 to 0.13 percent by weight of carbon;
0 to 1 percent by weight of silicon;
0 to 1 percent by weight of manganese;
18 to 21 percent by weight of chromium;
15 to 21 percent by weight of cobalt;
0 to 0.015 percent by weight of phosphorus;
0 to 0.02 percent by weight of sulphur;
1 to 2 percent by weight of aluminium;
0 to 0.2 percent by weight of copper;
2 to 3 percent by weight of titanium;
0 to 0.15 percent by weight of zirconium;
0 to 0.02 percent by weight of boron;
0 to 1.5 percent by weight of iron; and
a residual component.

14. The sliding bearing according to claim 13 , wherein the residual component includes 48.965 percent by weight to 64 percent by weight of nickel.

15. The sliding bearing according to claim 13 , wherein the residual component includes nickel and contaminations.

16. The sliding bearing according to claim 13 , wherein a remaining weight content of the residual component is formed by nickel.

17. The sliding bearing according to claim 1 , wherein the residual component includes 0.2 percent by weight or less of contaminations.

18. The sliding bearing according to claim 1 , wherein the shaft material is a case-hardened steel.

19. An internal combustion engine, comprising:
at least one gas exchange valve including a valve stem;
the sliding bearing according to claim 1 ; and
wherein the shaft of the sliding bearing includes the valve stem.

20. A method for producing a sliding bearing, comprising:
providing a bearing bush including a sintered bearing bush material having a residual porosity of at least 8 percent;
providing an uncoated shaft including a shaft material, the shaft slidingly and moveably guidable within the bearing bush; and
filling 80 percent or more of a volume of the residual porosity of the sintered bearing bush material with an oil via introducing the oil into the residual porosity in an impregnating operation at a pressure of 1 mbar to 850 mbar and at an oil temperature of 42° Celsius to 97° Celsius.

21. An electric machine, comprising:
a sliding bearing including an uncoated shaft and a bearing bush, the uncoated shaft including a shaft material, the bearing bush including a sintered bearing bush material having a residual porosity of 8 percent or more;
a stator;
a rotor rotatably mounted on the stator and rotatable relative to the stator via the sliding bearing;
wherein the shaft is slidingly and moveably guided, relative to the bearing bush, within the bearing bush; and
wherein a volume of the residual porosity is filled with an oil up to 80 percent or more.

Assignees

• Mahle Int Gmbh

Inventors

• Geis Armin
• Gutmann Andreas
• Kurmanaeva Lilia
• Puck Alexander
• Sutter Patrick
• Wintrich Klaus

Classifications

• C22C38/12

  containing tungsten, tantalum, molybdenum, vanadium, or niobium · CPC title

• C22C38/06

  containing aluminium · CPC title

• F16C2202/10

  Porosity · CPC title

• C22C33/0242

  using the impregnating technique · CPC title

• C22C38/04

  containing manganese · CPC title