Aerodynamic slide bearing

• US 4,743,125 A
• Filed: 12/01/1986
• Issued: 05/10/1988
• Est. Priority Date: 12/14/1985
• Status: Expired due to Term

• Current Assignee: Rolls-Royce Deutschland Limited & Company KG (Rolls-Royce Holdings Plc)
• Original Assignee: Klockner-Humboldt-Deutz AG
• Inventors: Dammel, Uwe, Domes, Bernd
• Primary Examiner(s): Footland, Lenard A.
• Application Number:
  US06/936,370
• Time in Patent Office: 526 Days
• Field of Search: 384/99, 384/104, 384/106, 384/117, 384/119, 384/103
• US Class Current: 384/99
• CPC Class Codes: F16C 17/028 with fixed wedges to generate hydrodynamic pressure, e.g. multi-lobe bearings
• CPC Class Codes: F16C 2360/00 Engines or pumps in general F01 - F04
• CPC Class Codes: F16C 27/02 Sliding-contact bearings
• CPC Class Codes: F16C 33/1005 with gas, e.g. air, as lubricant

Abstract

An aerodynamic slide bearing which uses air as a lubricant. A shaft is supported on substructures distributed about its circumference, which exhibit predetermined elasticity and dampening behavior. A dampening chamber is located between each substructure and an outer casing to give the aerodynamic slide bearing requisite dampening characteristics. Because of the modular design, the aerodynamic slide bearing is relatively insensitive to shifting of the shaft.

Claims

1. An aerodynamic slide bearing for a high speed shaft having an elastic and dampening structure nonrotatably mounted in an outer casing, which has at least one dampening chamber between the elastic and dampening structure and the outer casing, and wherein a plurality of converging lubrication pockets are provided between the elastic and dampening structure and the shaft, characterized by:

said elastic and dampening structure is divided, in the circumferential direction of the slide bearing, into at least two separate substructures, said substructures having shaft supporting bearing surfaces with fixed contours creating said converging lubrication pockets, wherein said substructures are individually supported at their circumferentially opposite ends on said outer casing and a separate damping chamber is provided radially between each substructure and the interior of said outer casing, and wherein, in the unstressed condition of said slide bearing, the radial depth of said lubrication pocket is at its maximum and the radial depth of said dampening chamber is between 0.2 and 10 percent of the value of the diameter of the shaft supported by said slide bearing.

2. The aerodynamic slide bearing of claim 1 wherein said lubrication pockets are defined in part by surfaces on the radially inner side of said substructres which are cylindrical when the aerodynamic slide bearing is in an unstressed condition.

3. The aerodynamic slide bearing of claim 1 wherein said outer casing has a cylindrical interior surface and further comprising circumferentially spaced supports on the inside of said outer casing extending radially inwardly therefrom and engaging said substructure to fix the circumferential position of the latter relative to said outer casing.

4. The aerodynamic slide bearing of claim 3 wherein said substructures radially abut said supports.

5. The aerodynamic slide bearing of claim 1 wherein at least three substructures are provided.

6. The aerodynamic slide bearing of claim 1 wherein the clearances between said substructures and said shaft are such that the shaft is freely rotatable in the aerodynamic slide bearing in the unstressed condition of the latter.

7. The aerodynamic slide bearing of claim 1 wherein said fixed contours define cylinders whose radii are greater than the radius of the supported shaft.

8. The aerodynamic slide bearing of claim 1 characterized by the fact that, in the unstressed condition of the aerodynamic slide bearing, the clearance between the shaft and the circumferentially central part of said bearing surface of the substructures of the aerodynamic slide bearing is virtually zero, and wherein parts of said bearing surface diverge radially outward from said shaft in circumferentially opposite directions from said central part to define said lubrication pockets in the form of two converging support wedges whereby said aerodynamic slide bearing is operative in both directions of rotation of the shaft.

9. The aerodynamic slide bearing of claim 1 wherein each substructure includes a pair of radially inner and outer components in generally juxtaposed relation to one another, said inner component confronting said shaft and said outer component confronting said outer casing, said inner component being rigid and said outer component being a resilient spring.

10. The aerodynamic slide bearing of claim 9 wherein each of said outer components is a segment of a hollow cylinder whose outer radius is greater than the inner radius of said outer casing and whose inner radius is greater than the radius of the shaft supported by said bearing.

11. The aerodynamic slide bearing of claim 1 wherein said substructures are single piece components radially supported on said casing only at their circumferential ends, said single piece components having a close fitting relationship with said shaft at the circumferentially middle part of their radially inward facing bearing surfaces and said single piece components being made of material permitting resilient flexing in a radial direction.

12. The aerodynamic slide bearing of claim 11 wherein said substructures are substantially arcuate segments of a cylinder.

13. The aerodynamic slide bearing of claim 11 wherein said substructures are a composite material having a high carbon content.

14. aerodynamic slide bearing of claim 11 wherein said substructures are a laminate with a high carbon content.

15. aerodynamic slide bearing of claim 11 wherein said substructures are in circumferentially abutting relation to one another.

16. The aerodynamic slide bearing of claim 15 and further comprising a pin on said outer casing extending radially inward therefrom and engaging at least one of said substructures whereby said substructures are prevented from rotating relative to said outer casing.

17. The aerodynamic slide bearing of claim 11 wherein converging lubrication pockets are formed between said shaft and said single piece components on circumferentially opposite sides of said middle part of said bearing surfaces.

18. An aerodynamic slide bearing for a high speed shaft having an elastic and dampening structure nonrotatably mounted in an outer casing, which has at least one dampening chamber between the elastic and dampening structure and the outer casing, and wherein a plurality of converging lubrication pockets are provided between the elastic and dampening structure and the shaft, characterized by:

said elastic and dampening structure is divided, in the circumferential direction of the slide bearing, into at least two separate substructures, and said substructures having shaft supporting bearing surfaces with fixed contours creating said converging lubrication pockets, each substructure including a pair of radially inner and outer components in generally juxtaposed relation to one another, said inner component confronting said shaft and said outer component confronting said outer casing, said inner component being rigid and said outer component being a resilient spring, said inner component being in radial thrust transmitting engagement with said outer component and the circumferentially opposite ends of said outer component being supported on said outer casing, said outer component being radially spaced from said outer casing intermediate its circumferentially opposite ends to form said dampening chamber therewith and abutments on the inside of said outer casing supporting and circumferentially positioning said components on the inside of said outer casing.

19. The aerodynamic slide bearing of claim 18 wherein said inner component engages a central surface part of said outer component on a line which is parallel to the axis of said shaft.

20. The aerodynamic slide bearing of claim 18 wherein said inner component is made of artificial carbon and said outer component is an arcuate segment of a steel tube.

21. An aerodynamic slide bearing for a high speed shaft having an elastic and dampening structure nonrotatably mounted in an outer casing, which has at least one dampening chamber between the elastic and dampening structure and the outer casing, and therein a plurality of converging lubrication pockets are provided between the elastic and dampening structure and the shaft, characterized by:

said elastic and dampening structure is divided, in the circumferential direction of the slide bearing, into at least two separate substructures, and said substructures having shaft supporting bearing surfaces with fixed contours creating said converging lubricating pockets, each substructure including a pair of radially inner and outer components in generally juxtaposed relation to one another, said inner component being rigid and said outer conponent being a resilient spring, said inner component being a segment of a hollow cylinder having a cylindrical shaft supporting bearing surface which is in confronting relation to said shaft and which has a radius greater than the radius of said shaft, said outer component being a segment of a hollow cylinder whose inner radius is greater than the radius of said shaft and whose radially outer surface has a radius greater than the radius of the inside of said outer casing which it confronts.

22. The aerodynamic slide bearing of claim 22 wherein each of said inner components is a segment of a hollow cylinder whose outer radius is less than the inner radius of said outer component.

23. An aerodynamic slide bearing for a high speed shaft having an elastic and dampening structure nonrotatably mounted in an outer casing, which has at least one dampening chamber between the elastic and dampening structure and interior wall surface of the outer casing, and wherein a plurality of converging lubrication pockets are provided between the elastic and dampening structure and the bearing supported portion of said shaft, characterized by:

said elastic and dampening structure is divided, in the circumferential direction of the slide bearing, into at least two separate substructures, and said substructures having shaft supporting bearing surfaces with fixed contours creating said converging lubrication pockets, circumferentially confronting surfaces at the adjacent ends of said substructures and an abutment disposed on said casing radially outward of said bearing supported portion of said shaft and extending radially inward of said interior wall surface between and in circumferential thrust transmitting relation to said circumferentially confronting surfaces, whereby said abutment prevents said substructure from rotating relative to said casing about the axis of said shaft.

24. The aerodynamic slide bearing of claim 23 wherein said abutment is a pin releasably mounted on said outer casing.

25. The aerodynamic slide bearing of claim 23 wherein said abutment extends between said adjacent ends of said substructures thereby maintaining said adjacent ends in circumferentially spaced relation to one another.

26. An aerodynamic slide bearing for a high speed shaft having an elastic and dampening structure nonrotatably mounted in the cylindrical interior of an outer casing, which has at least one dampening chamber between the elastic and dampening structure and the outer casing, and wherein a plurality of converging lubrication pockets are provided between the elastic and dampening structure and the shaft, characterized by:

said elastic and dampening structure is divided, in the circumferential direction of the slide bearing, into at least two separate substructures, said substructures having shaft supporting bearing surfaces with fixed contours creating said converging lubrication pockets, each substructure including a pair of radially inner and outer components comprising arcuate segments of hollow cylinders, in juxtaposed relation to one another, said inner component presenting one of said shaft supporting bearing surfaces whose radius is greater than the radius of said shaft, said outer component being a resilient spring having an outer radius greater than the radius of said interior of said outer casing whereby its circumferentially opposite ends are supported on said cylindrical interior of said outer casing and having an inner radius greater than the outer radius of said inner component.