Pivot bearing

Patent metadata

Field	Value
Publication number	US-11719279-B2
Application number	US-201917311382-A
Country	US
Kind code	B2
Filing date	Sep 9, 2019
Priority date	Dec 5, 2018
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A pivot bearing (1), includes a metallic first bearing element (2) made of steel, which is at least partially coated by means of a coating (5), a metallic second bearing element (3) made of steel, which is coated with a PTFE-containing sliding lining (6), wherein the coating (5) and the sliding lining (6) are in sliding contact, and wherein the coating (5) comprises at least one first layer (9) deposited on the first bearing element (2) by means of a PVD, CVD, or PECVD method, wherein the coating (5) also comprises at least one further layer which is arranged on the at least one first layer (9) and faces away from the first bearing element (2).

First claim

What is claimed is:

1. A pivot bearing comprising
a metallic first bearing element made of steel, the metallic first bearing element at least partially being coated by means of a coating; and
a metallic second bearing element made of steel, the metallic second bearing element being coated with a PTFE-containing sliding lining;
the coating and the sliding lining being in sliding contact, the coating including at least one first layer deposited on the first bearing element by a PVD, CVD or PECVD method;
wherein at least one of:
the at least one first layer is either an oxidic, nitridic, oxynitridic or carbidic material layer which contains at least one of the elements from the group consisting of titanium, aluminum, chromium, tungsten and molybdenum, or
the at least one first layer is an amorphous carbon layer or a diamond layer, or
the at least one first layer is a metallic layer formed from one or more of the metals of the group comprising chromium, brass, bronze, white metal, copper, zinc or tin;

wherein the coating further comprises at least one further layer arranged on the at least one first layer on a side of the first layer that faces away from the first bearing element,
wherein the at least one further layer includes a second layer adjoining a first layer of the at least one first layer on a side of the first layer facing away from the first bearing element, the second layer differing from the adjoining first layer in its composition and being formed either by means of a PVD, CVD or PECVD method and/or is formed from a lubricating varnish comprising PTFE.

2. The pivot bearing according to claim 1 , wherein the coating comprises exactly one first layer and exactly one further layer.

3. The pivot bearing according to claim 1 , wherein the coating comprises two or three first layers and exactly one further layer.

4. The pivot bearing according to claim 1 , wherein the second layer is formed by a PVD, CVD or PECVD method and is either:
an oxidic, nitridic, oxynitridic or carbidic material layer, or
an amorphous carbon layer or a diamond layer, or
a metallic layer made of chromium, brass, bronze, white metal, copper, zinc or tin.

5. The pivot bearing according to claim 1 , wherein the coating comprises the at least one first layer, the second layer and a layer sequence thereon, wherein the layer sequence has alternating third layers and fourth layers, wherein a composition of the third layers corresponds to a composition of the first layer, and a composition of the fourth layers corresponds to a composition of the second layer.

6. The pivot bearing according to claim 1 , wherein the first layer adjoining the second layer is formed from molybdenum nitride and the second layer is formed from copper.

7. The pivot bearing according to claim 1 , wherein the first layer adjoining the second layer is formed from chromium and the second layer is formed from chromium nitride.

8. The pivot bearing according to claim 1 , wherein the at least one first layer includes the first layer made of chromium and a further first layer made of tungsten carbide and the second layer is a hydrogen-containing tungsten-doped amorphous carbon layer of the type a-C:H:W.

9. The pivot bearing according to claim 1 , wherein the first layer adjoining the second layer is a silicon-doped amorphous carbon layer of a type a-C:H:Si and the second layer is an amorphous carbon layer of a type a-C:H or an amorphous carbon layer of a type a-C:H:Si with different silicon doping than the first layer adjoining the second layer.

10. The pivot bearing according to claim 1 , wherein the at least one first layer is the amorphous carbon layer or the diamond layer.

11. The pivot bearing according to claim 1 , wherein the at least one first layer is the metallic layer formed from one or more of the metals of the group comprising chromium, brass, bronze, white metal, copper, zinc or tin.

12. The pivot bearing according to claim 1 , wherein the second layer is formed by a PVD, CVD or PECVD method and is an oxidic, nitridic, oxynitridic or carbidic material layer.

13. The pivot bearing according to claim 1 , wherein the second layer is formed by a PVD, CVD or PECVD method and is an amorphous carbon layer or a diamond layer.

14. The pivot bearing according to claim 1 , wherein the second layer is formed by a PVD, CVD or PECVD method and is a metallic layer made of chromium, brass, bronze, white metal, copper, zinc or tin.

15. A pivot bearing comprising:
an inner ring made of steel; and
an outer ring made of steel;
one of the inner ring and the outer ring at least partially being coated by a coating, and the other of the inner ring and the outer ring being coated with a sliding lining including PTFE;
the coating and the sliding lining being in sliding contact, the coating including at least one first layer, the at least one first layer being a material layer, an amorphous carbon layer, a diamond layer or a metallic layer,
the material layer being an oxidic, nitridic, oxynitridic or carbidic material layer containing at least one of the elements from the group consisting of titanium, aluminum, chromium, tungsten and molybdenum,
the metallic layer being formed from one or more of the metals of the group comprising chromium, brass, bronze, white metal, copper, zinc or tin; and
the coating further comprising at least one further layer arranged on an exterior of the at least one first layer,
wherein the coating comprises two or three first layers and exactly one further layer.

16. The pivot bearing as recited in claim 15 , wherein inner ring includes a convex outer surface at least partially coated by the coating and the outer ring includes a concave inner surface coated with the sliding lining.

17. The pivot bearing as recited in claim 15 wherein the least one further layer is a PTFE impregnation layer.

18. The pivot bearing as recited in claim 15 wherein the sliding lining includes:
a PTFE fabric embedded in a resin matrix, or
a metallic-polymer composite material containing sintered bronze and PTFE.

19. The pivot bearing according to claim 15 , wherein the at least one further layer includes a second layer adjoining a first layer of the at least one first layer on a side of the first layer facing away from the first bearing element, the second layer differing from the adjoining first layer in its composition and being formed either by means of a PVD, CVD or PECVD method,
wherein the second layer is formed by a PVD, CVD or PECVD method and is either:
an oxidic, nitridic, oxynitridic or carbidic material layer, or
an amorphous carbon layer or a diamond layer, or
a metallic layer made of chromium, brass, bronze, white metal, copper, zinc or tin.

20. A method of creating a pivot bearing comprising:
coating a first steel bearing element with at least one first layer by PVD, CVD or PECVD;
coating a second steel bearing element with a sliding lining including PTFE;
providing at least one further layer on the at least one first layer; and
arranging the first steel bearing element and the second steel bearing element such that the sliding lining is in sliding contact with the coating and the at least one further layer is between the at least one first layer and the sliding lining,
the at least one first layer being a material layer, an amorphous carbon layer, a diamond layer or a metallic layer,
the material layer being an oxidic, nitridic, oxynitridic or carbidic material layer containing at least one of the elements from the group consisti

Assignees

• Schaeffler Technologies Ag

Inventors

• Kursawe Serge
• Weitkamp Thomas
• Bolte Frank
• König Thomas
• Podgaynyy Nikolay

Classifications

• F16C23/045 Primary

  for radial load mainly, e.g. radial spherical plain bearings · CPC title

• F16C33/043

  Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC] · CPC title

• F16C33/125

  Details of bearing layers, i.e. the lining · CPC title

• F16C33/121 Primary

  Use of special materials · CPC title

• F16C33/201

  Composition of the plastic · CPC title