CHARGING DEVICE

Abstract

The invention relates to a charging device (1), in particular an exhaust gas turbocharger (2), comprising a bearing housing (3) and a shaft (4) supported therein, comprising an axial bearing disk (5) for supporting the shaft (4) in the axial direction (6).

It is essential for the invention thereby that a receptacle (7) for the axial bearing disk (5) is provided, wherein the receptacle (7) has a single lug (9), which protrudes radially inwardly to an axis (8), that the axial bearing disk (5) has an edge-side recess (10), which is formed complementary to the bearing housing-side lug (9), that the lug (9) and the recess (10) are formed and/or aligned in such a way that they allow for only a single predefined installation position of the axial bearing disk (5) in the receptacle (7),

Claims

1. A charging device, comprising: a bearing housing and a shaft supported therein; an axial bearing disk supporting the shaft in an axial direction; the bearing housing including a receptacle structured and arranged to receive the axial bearing disk; the receptacle including one of (i) a single lug that protrudes radially relative to an axis of the shaft and (ii) a single recess that opens radially relative to the axis of the shaft; the axial bearing disk including the other one of (i) the lug and (ii) the recess; wherein the recess is configured complementary to the lug; and wherein the lug and the recess are structured and arranged such that the axial bearing disk is installable within the receptacle only in a single predefined installation position of the axial bearing disk.

2. The charging device according to claim 1, wherein the recess has an axial thickness and the lug has an axial thickness that are smaller than an axial thickness of the axial bearing disk.

3. The charging device according to claim 2, wherein the axial thickness of the recess and the axial thickness of the lug are equal to half the axial thickness of the axial bearing disk.

4. The charging device according to claim 1, wherein the recess and the lug are symmetrical with respect to a radial direction of the shaft.

5. The charging device according to claim 1, wherein: the recess has an axial thickness identical to an axial thickness of the axial bearing disk; the lug has an axial thickness that is smaller than the axial thickness of the axial bearing disk; and the recess and the lug are asymmetrical with respect to a radial direction of the shaft.

6. The charging device according to claim 1, wherein: the recess has an axial thickness and the lug has an axial thickness that are identical to an axial thickness of the axial bearing disk; and the recess and the lug are asymmetrical with respect to a radial direction of the shaft.

7. The charging device according to claim 1, wherein the axial bearing disk is a punched axial bearing disk.

8. An axial bearing disk of a charging device, comprising a disk body having an outer edge side, the disk body including one of: a recess disposed at the outer edge side and extending into the disk body radially inwardly; and a lug protruding radially outwardly from the outer edge side.

9. The axial bearing disk according to claim 8, wherein the disk body includes the recess, and the recess has an axial thickness that is smaller than an axial thickness of the disk body.

10. The axial bearing disk according to claim 9, wherein the axial thickness of the recess is equal to half the axial thickness of the disk body.

11. The axial bearing disk according to claim 8, wherein the disk body includes the recess, and the recess has an axial thickness that is identical to an axial thickness of the disk body.

12. The axial bearing disk according to claim 8, wherein the disk body includes the lug, and the lug has an axial thickness that is smaller than an axial thickness of the disk body.

13. The axial bearing disk according to claim 8, wherein the disk body includes the lug, and the lug has an axial thickness that is identical to an axial thickness of the disk body.

14. The axial bearing disk according to claim 8, wherein the axial bearing disk is structured as a punched component.

15. The charging device according to claim 1, wherein: the receptacle includes the recess and the axial bearing disk includes the lug; the lug protrudes radially outward from an outer edge of the axial bearing disk; and the recess protrudes radially into the bearing housing from an edge of the receptacle.

16. The charging device according to claim 1, wherein: the receptacle includes the lug and the axial bearing disk includes the recess; the lug protrudes radially into the receptacle from an edge of the receptacle; and the recess protrudes radially into the axial bearing disk from an outer edge of the axial bearing disk.

17. The charging device according to claim 16, wherein the lug is defined by a portion of the bearing housing.

18. The charging device according to claim 17, wherein a radially inward facing surface of the lug merges into a radially inward facing surface of the receptacle.

19. The charging device according to claim 16, wherein the recess is defined at least partially by an outer circumferential surface of the axial bearing disk.

20. A charging device, comprising: a bearing housing; a shaft including a shaft axis supported within the bearing housing; an axial bearing disk axially supporting the shaft, the axial bearing disk including an axial opening through which the shaft extends; the bearing housing including a receptacle structured and arranged to receive the axial bearing disk; the receptacle including one of a (i) a lug that protrudes radially relative to the shaft axis and (ii) a recess that opens radially relative to the shaft axis; the axial bearing disk further including the other one of (i) the lug and (ii) the recess; wherein the recess and the lug are structured complementary to one another; and wherein the lug and the recess are structured and arranged to form a key and lock system where the axial bearing disk is installable within the receptacle exclusively in a predefined installation position of the axial bearing disk.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In each case schematically,

[0022] FIG. 1 shows a view onto a charging device according to the invention in the area of a receptacle for an axial bearing disk according to a first embodiment,

[0023] FIG. 2 shows a sectional illustration along the sectional plane A-A through the charging device according to FIG. 1 with inserted axial bearing disk,

[0024] FIG. 3 shows an illustration of the asymmetry of the bearing housing-side lug to a radial,

[0025] FIG. 4 shows an illustration as in FIG. 1, but with a bearing housing-side lug of a smaller axial thickness,

[0026] FIG. 5 shows a sectional illustration along the sectional plane B-B from FIG. 4 with a first embodiment of an axial bearing disk,

[0027] FIG. 6 shows an illustration as in FIG. 5, but with a second embodiment of an axial bearing disk,

[0028] FIG. 7 shows a diagram to clarify the symmetry of a lug or of a recess, respectively, to a radial,

[0029] FIG. 8 shows an axial bearing disk according to the invention with a nose arranged at the edge side,

[0030] FIG. 9 shows an illustration as in FIG. 8, but from the rear side.

DETAILED DESCRIPTION

[0031] According to FIGS. 1, 2 as well as 4 to 6, a charging device 1 according to the invention, which can be formed, for example, as exhaust gas turbocharger 2, has a bearing housing 3 as well as a shaft 4, which is supported therein and which is illustrated only schematically. An axial bearing disk 5 (see also FIGS. 3 as well as 7 to 9) for supporting the shaft 4 in the axial direction 6 is likewise provided. A receptacle 7 for the axial bearing disk 5 is thereby provided in the bearing housing 3, wherein the receptacle 7 has a single lug 9 protruding inwardly to an axis 8, while the axial bearing disk 5 has an edge-side recess 10, which is formed complementary to the bearing housing-side lug 9. The lug 9 and the recess 10 are thereby formed and/or aligned in such a way that they allow only a single, namely predefined installation position of the axial bearing disk 5 in the receptacle 7 of the bearing housing 3. It goes without saying that, in reversed form, it can also be provided according to the invention that the receptacle 7 has only a single recess (not shown), which is directed outwardly from an axis 9, while the axial bearing disk 5 has an edge-side lug 9, which is formed complementary to the bearing housing-side recess, as it is shown, for example, according to FIGS. 8 and 9. In this case, the lug 9 and the non-illustrated bearing housing-side recess are also formed or aligned with one another, respectively, in such a way that they allow only a single predefined installation position of the axial bearing disk 5 in the receptacle 7 of the bearing housing 3 and thus in particular rule out an incorrect assembly.

[0032] A single predefined installation position is to thereby mean that there is in fact only and exclusively a single installation position, so that the axial bearing disk 5 can only assume the installation position when it is installed correctly with respect to the rotational angle position and correct with respect to the front sides.

[0033] In particular a so-called poka-yoke system, which rules out an incorrect assembly of the axial bearing disk 5 in the bearing housing 3, can be created by means of such a charging device 1 according to the invention. The axial bearing disk 5 and the corresponding receptacle 7, that is concretely, the lug 9, 9 or a corresponding recess 10, respectively, thereby also form a key and lock system, which ensures the use of authorized axial bearing disks 5 and thus provides for a long-term optimal storage of the shaft 4 in the axial direction 6.

[0034] When now looking at the individual embodiments of the charging device 1 according to the invention or also of the axial bearing disk 5 according to the invention, respectively, it can be seen in the case of the embodiments according to FIGS. 1 to 3 that the recess 10 in the area of the axial bearing disk 5 has an axial thickness D.sub.A, which is identical to the axial thickness D of the axial bearing disk 5. The lug 9 thereby has an axial thickness D.sub.N, which is likewise identical to the thickness D of the axial bearing disk 5, wherein the lug 9 or the recess 10, respectively, are arranged asymmetrically to a radial 11 in this case for only a single predefined installation position, that is, e.g., with a certain eccentricity E, as it is illustrated according to FIG. 3. Due to this asymmetry or eccentric arrangement of the lug 9, respectively, or of the recess 10, respectively, with respect to the radial 11, a mix-up of the front sides of the axial bearing disk 5 can be ruled out when installing the latter into the receptacle 7. As alternative to an eccentricity E, an incline of a central axis of the lug 9 with respect to the radial 11 or another lug 9, which is not designed mirror-symmetrically with respect to the radial 11, is also conceivable.

[0035] When looking at the embodiments of the charging device 1 according to the invention or of the axial bearing disk 5 according to the invention, respectively, according to FIGS. 4 to 9, it can be seen that the recess 10 has an axial thickness D.sub.A and/or that the lug 9 has an axial thickness D.sub.N, which are smaller than the axial thickness D of the axial bearing disk 5. The axial thickness D.sub.A of the recess 10 can, for example, be identical to the axial thickness D.sub.N of the lug 9, wherein both of them together correspond to the thickness D of the axial bearing disk 5. An embodiment of this type is shown, for example, in FIG. 6. A special case of this embodiment can be at hand, for example, when the following applies: D.sub.A=D.sub.N=0.5 D. An embodiment of this type offers the large advantage that the recess 10 is not continuous in the axial bearing disk 5, so that it has a continuous surface 12 on the side facing the shaft 4. Due to the recess 10, which is provided only on a single front side, namely on the front side located opposite the continuous surface 12, an incorrect assembly in the receptacle 7 of the bearing housing 3 or of a bearing housing cover, respectively, can likewise be avoided. If the axial thickness D.sub.A of the recess 10 in the axial bearing disk 5 is smaller than the entire axial thickness D of the axial bearing disk 5, the recess 10 can also be arranged symmetrically to the radial 11, as it is illustrated according to FIG. 7, because an incorrect assembly is already ruled out due to the non-continuous recess 10.

[0036] It goes without saying that it is also conceivable thereby that the axial thickness D.sub.N of the lug 9 is smaller than the axial thickness D of the axial bearing disk 5, as it is illustrated according to FIG. 5, wherein, in the case of the axial bearing disk 5 illustrated there, the recess 10 has an axial thickness D.sub.A, which corresponds to the axial thickness D of the axial bearing disk 5. It would be irrelevant in this case, whether the recess 10 is formed symmetrically or asymmetrically to a radial 11, which runs orthogonally to the axis 8, provided that the axial bearing disk 5 has for example two identical surfaces 12, which in each case provides for a support.

[0037] The axial bearing disk 5 is preferably formed as simple punched part and can thus be produced not only cost-efficiently, but also with a high quality.

[0038] When looking at the axial bearing disks 5 according to FIGS. 8 and 9, it can be seen that, in contrast to the above-shown axial bearing disks 5, they have a lug 9 protruding outwardly on the edge-side, wherein the receptacle 7 of the bearing housing 3 would need to have a corresponding, complementary recess in this case, in order to thus ensure an unambiguously predefined installation position. The lug 9 advantageously provides for a surface 12, which is continuous with respect to the surface 12, so that the surface 12 is not interrupted by the recess 10 in this case, because the latter is provided in the area of the receptacle 7 of the bearing housing 3. It goes without saying that the statements made with regard to the axial bearing disk 5 having the recess 10, and the statements made with regard to the lug 9 of the receptacle 7, apply analogously to the reversed form, in the case of which the lug 9 is arranged at the axial bearing disk 5, while the recess 10 is arranged in the area of the receptacle 7 of the bearing housing 3. The continuous surfaces 12 provide the large advantage that they can be machined significantly more easily, in particular as compared to the pins protruding axially from the surface 12, which had previously been used for the protection against rotation and fixation of the axial bearing disk 5.

[0039] A simple and cost-efficient production in particular of the axial bearing disk 5, namely preferably as simple punched part, can be ensured by means of the charging device 1 according to the invention and by means of the axial bearing disk 5 according to the invention, wherein an incorrect assembly can simultaneously be ruled out. Due to the poka-yoke system, an installation of the axial bearing disk 5 in the receptacle 7 of the bearing housing 3 can even be performed by an untrained worker.

[0040] A key and lock system, which ensures the use of authorized and thus high-quality axial bearing disks 5, can furthermore be formed via a special design of the lug 9 or of the corresponding recess 10, respectively. Compared to a securing pin, which had previously been used, for example, for the protection against rotation of the axial bearing disks, the axial bearing disk 5 according to the invention and the charging device 1 according to the invention can forgo a safety pin of this type, whereby not only the assembly costs, but additionally also the number of parts and, associated therewith, the storage and logistics costs, can be lowered.