Machine arrangement

Abstract

A machine arrangement, including at least one bearing ring, wherein a glass fiber is connected with the machine arrangement. To allow a proper measurement of stresses even at curved surfaces of the machine arrangement as it is typical in the case of bearing rings, the connection between the glass fiber and the machine arrangement is established by a metallic material which metal material is connected by material bonding with the machine arrangement as well as with the glass fiber.

Claims

1. A machine arrangement, comprising at least one bearing ring; a glass fiber connected with the machine arrangement, wherein the connection between the glass fiber and the machine arrangement is established by a metallic material, wherein the metallic material is connected to each of the machine arrangement and the glass fiber by a material bonding, the metallic material encasing the glass fiber such that when viewing a cross section of the glass fiber the metallic material contacts and completely surrounds an outer surface of the glass fiber, the metallic material is materially bonded entirely around the outer surface of the glass fiber such that when viewing the cross section the metallic material is materially bonded to every circumferential location of the outer surface of the glass fiber, and wherein the metallic material is made of a single material composition such that the single material composition both encases the glass fiber and is the only material composition located between the glass fiber and a surface of the machine arrangement.

2. The machine arrangement according to claim 1, wherein the material bonded connection between the metallic material and the machine arrangement is established by a welding process using the metallic material.

3. The machine arrangement according to claim 1, wherein the material bonded connection between the metallic material and the glass fiber is established by one of a welding process or a melting process using the metallic material.

4. The machine arrangement according to claim 1, wherein the metallic material is chromium (Cr).

5. The machine arrangement according to claim 1, wherein the metallic material is nickel (Ni).

6. The machine arrangement according to claim 1, wherein the metallic material is a metal alloy.

7. The machine arrangement according to claim 6, wherein the metallic material is an alloy of chromium (Cr) and nickel (Ni).

8. The machine arrangement according to claim 1, wherein the metallic material has a thickness measured in a direction perpendicular to a longitudinal axis of the glass fiber of at least 0.3 (zero point three) mm.

9. The machine arrangement according to claim 1, wherein the glass fiber is arranged on a curved surface of the machine arrangement.

10. The machine arrangement according to claim 9, wherein the curved surface of the machine arrangement is a cylindrical surface of the at least one bearing ring, and the single composition is the only material composition located between the glass fiber and the cylindrical surface.

11. The machine arrangement according to claim 1 wherein the metallic material has a thickness measured in a direction perpendicular to a longitudinal axis of the glass fiber of at least 0.5 mm.

12. A machine arrangement, comprising at least one bearing ring; a glass fiber connected with the machine arrangement, the glass fiber being encased with a first metallic material such that when viewing a cross section of the glass fiber the first metallic material contacts and completely surrounds an outer surface of the glass fiber, the first metallic material is materially bonded entirely around the outer surface of the glass fiber such that when viewing the cross section the metallic material is materially bonded to every circumferential location of the outer surface of the glass fiber, wherein the connection between the glass fiber and the machine arrangement is established by a second metallic material wherein the second metallic material is connected to each of the machine arrangement and the first metallic material by a material bonding, the second metallic material encasing the first metallic material such that when viewing the cross section the second metallic material contacts and completely surrounds a first metallic material outer surface, the second metallic material is materially bonded entirely around the first metallic material outer surface such that when viewing the cross section the second metallic material is materially bonded to every circumferential location of the first metallic material outer surface, and wherein there is no non-metallic material between the glass fiber and the at least one bearing ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The drawings show embodiments of the invention.

(2) FIG. 1 shows in a perspective view a section of an outer bearing ring of a roller bearing, on which a glass fiber is fixed,

(3) FIG. 2a shows a glass fiber connected to a bearing ring by a metallic material, FIG. 2b shows the cross section A-A according to FIG. 1,

(4) FIG. 3 shows a perspective view of a glass fiber which is fixed at a bearing ring similar to FIG. 2b,

(5) FIG. 4 shows a front view of a glass fiber which is fixed at a bearing ring, similar to FIG. 3,

(6) FIG. 5 shows a perspective view of a glass fiber which is fixed in a groove of a bearing ring,

(7) FIG. 6 shows a front view of a glass fiber which is fixed in a groove of a bearing ring, similar to FIG. 5,

(8) FIG. 7a shows the process of fixing a glass fiber in a groove of a bearing ring in a first, early state,

(9) FIG. 7b shows the process of fixing a glass fiber in a groove of a bearing ring in a second, later state.

DETAILED DESCRIPTION OF THE INVENTION

(10) In FIG. 1 a machine arrangement 1 being an outer bearing ring of a roller bearing is shown. The bearing ring 1 has an outer spherical surface which is to be monitored with respect to strains which act in the machine part. The survey of those strains is carried out by the fiber Bragg grating (FBG) method which is known as such. Reference is made e. g. to U.S. Pat. No. 6,923,048 B2 where this technology is explained in more detail.

(11) For doing so a glass fiber 2 is securely fixed on the spherical, i. e. cylindrical outer circumference of the bearing ring 1. The glass fiber 2 has a longitudinal direction L which extends in the circumferential direction of the bearing ring 1.

(12) Details concerning the fixation of the glass fiber 2 at the bearing ring 1 can be seen from FIG. 2.

(13) In FIG. 2a, it can be seen that the glass fiber 2 is basically the pure glass element-possibly covered only by a reflective coating to ensure proper light conduction within the glass fiber-which is then connected with the bearing ring 2 by means of metallic material 3.

(14) In FIG. 2b, two different metallic materials are employed:

(15) A first metallic material 3 coats the glass fiber 2 itself. The preferred material is chromium (Cr).

(16) The first metallic material 3 it then connected with a second metallic material 3. This material is preferably an alloy, preferably from chromium (Cr) and nickel (Ni).

(17) Thus, a material bonding is established between the glass fiber 2 and the machine part 1 to be monitored. This means, all strains in the machine part 1 are directly transferred into the glass fiber 2. Thus, the precondition is assured for a precise measurement of physical parameters of the machine part 1.

(18) In FIG. 3 a further embodiment of the invention is shown. Here, the glass fiber 2 is provided with a cladding 3 from a first metallic material being nickel (Ni). This cladding is embedded in a second metallic material 3 being a nickel-chromium-alloy. The second metallic material 3 is fixed on the bearing ring 1 by means of welding or brazing 4.

(19) In FIG. 4 a similar solution is shown. Here, the glass fiber 2 is again embedded in a cladding of nickel 3. This cladding is covered by a coating 3 of a nickel-chromium-alloy. This coating 3 is fixed with the bearing ring 1 by means of welding or brazing 4.

(20) In FIG. 5 an alternative is shown. Here the bearing ring 1 has a groove 5, in which the glass fiber 1 is inserted and securely fixed. For doing so, the glass fiber 1 is cladded with a cover 3 from nickel. Then, the covered glass fiber 2 is fixed on the bearing ring 1 by a nickel-chromium-alloy 3which fills up the groove 5.

(21) A similar solution is shown in FIG. 6. Here, the bearing ring 1 again has a groove 5 in which the glass fiber 2 is inserted. The glass fiber 2 is embedded in a nickel cladding 3. The cladding 3 is embedded by a nickel-chromium-alloy 3. The fixation of the coating of nickel-chromium-alloy 3 is fixed in the groove 5 by means of welding or brazing 4.

(22) In FIG. 7a and FIG. 7b a process is depicted by which a fixation as shown in FIG. 6 can be realized. Here, a container 7 is arranged at the bearing ring 1 when the embedded glass fiber 2 (coated again by a nickel layer 3 and a layer form a nickel-chromium-alloy 3) is arranged in a groove 5 in the bearing ring 1. The container 7 is filled with braze paste 6. This is shown in FIG. 7a.

(23) Heating elements 8 being inductive heaters are arranged near the container 7. Due to the heat produced by the inductive heaters 8 the braze paste 6 melts and forms the brazing 4 which is shown in FIG. 7b. Afterwards, the container 7 is removed.

(24) The proposed connection technology can be used to fix a glass fiber 2 firmly between two points on the bearing ring 1 to use the fiber Bragg grating (FBG) method for measurement of specific data.

(25) For the cladding of the glass fiber 2 itself, pure materialspecifically nickel (Ni) or chromium (Cr)is preferred. This gives a very dense and defect free coating.

(26) For the outer coating a selection can be made from suitable alloys between nickel (Ni) and chromium (Cr) with or without additional elements such as B, Fe, Mn, Si, Ti, which can be selected to obtain a harder or more ductile coating and/or to reduce the melting temperature for the coating or later brazing or welding to be applied.

(27) Beside pure nickel also nickel can be used which is alloyed with a maximum of 2 weight-% titan (Ti), 1 weight-% silizium (Si) or a nickel-alloy with a maximum of 3.5 weight-% boron (B), 4.5 weight-% silizium (Si), between 5 and 7 weight-% chromium (Cr) and about 4 weight-% ferrum (Fe).

(28) For the outer coating 3 pure chromium (Cr) can be employed but also chromium alloyed with a maximum of 20 to 60 weight-% nickel (Ni). The outer coating has preferably between 0.2 to 0.5 mm wall thickness in order to enable microlaser welding or brazing,

(29) Here, a nickel-chromium-alloy is preferred with 20 to 80 weight-% nickel (Ni) and a balance of chromium (Cr). Also, an alloy has been found suitable with 20 to 70 weight-% nickel (Ni), 1 to 5 weight-% mangan (Mn), a maximum of 1 weight-% silizium (Si) and a balance of chromium (Cr). Also the addition of copper (Cu) can be beneficial.

REFERENCE NUMERALS

(30) 1 Machine arrangement (bearing ring) 2 Glass fiber 3 Metallic material 3 First metallic material 3 Second metallic material 4 Welding/Brazing 5 Groove 6 Braze paste 7 Container 8 Heating element (induction heating element) L Longitudinal axis