EXHAUST GAS TURBOCHARGER WITH INTEGRATION OF BEARING COMPONENTS

Abstract

An exhaust gas turbocharger includes: a compressor wheel; a turbine; and a shaft configured to rotatably interconnect the compressor wheel and the turbine. The shaft is mounted in the turbocharger by a bearing configured to absorb axial forces acting on the shaft. The turbocharger further includes a one-piece thrust ring arranged on the shaft, the one-piece thrust ring indirectly connecting the shaft with the bearing and being configured to transmit the axial forces acting on the shaft both in a thrust direction and in a counter-thrust direction opposite to the thrust direction.

Claims

1. An exhaust gas turbocharger (1) comprising: a compressor wheel (2); a turbine (3); and a shaft (4) configured to rotatably interconnect the compressor wheel (2) and the turbine (3), wherein the shaft (4) is mounted in the turbocharger (1) by a bearing (5) configured to absorb axial forces acting on the shaft; the turbocharger (1) further comprising a one-piece thrust ring (6) arranged on the shaft (4), wherein the one-piece thrust ring (6) indirectly connects the shaft (4) with the bearing (5) and is configured to transmit the axial forces acting on the shaft (4) both in a thrust direction (S) and in a counter-thrust direction (GS) opposite to the thrust direction.

2. The exhaust gas turbocharger (1) according to claim 1, wherein the thrust ring (6) comprises: a thrust surface (7) configured to absorb the axial forces in the thrust direction, the thrust surface (7) lying against the bearing (5) such that axial forces in a direction of the compressor wheel (2) are absorbed by the bearing (5), and a counter-thrust surface (14) configured to absorb the axial force in the counter-thrust direction, counter-thrust surface (14) lying against the bearing (5) such that axial forces in a direction of the turbine (3) are absorbed by the bearing (5).

3. The exhaust gas turbocharger (1) according to claim 2, wherein the bearing (5) is formed of a bearing housing (8) and a bearing body (9) of a stator (10).

4. The exhaust gas turbocharger (1) according to claim 3, wherein a thrust bearing is integrated in the bearing body (9), the thrust bearing being in contact with the thrust surface (7) of the thrust ring (6) and configured to absorb axial forces in the direction of the compressor wheel (2).

5. The exhaust gas turbocharger (1) according to claim 3, wherein the thrust ring (6) with the counter-thrust surface (14) lies against the bearing housing (8) so as to absorb the axial forces in the direction of the turbine (3).

6. The exhaust gas turbocharger (1) according to claim 5, further comprising a force transmission component arranged between the thrust ring (6) and the bearing housing (8).

7. The exhaust gas turbocharger (1) according to claim 2, wherein the thrust ring (6) is non-positively arranged on the shaft (4) and contacts a shaft shoulder (11) by a part of the counter-thrust surface (14).

8. The exhaust gas turbocharger (1) according to claim 3, wherein the bearing (5) comprises bores, passages and an oil distributor so as to supply the bearing with lubricant.

9. The exhaust gas turbocharger (1) according to claim 8, wherein a cross-sectional area of the bores, passages and/or of the oil distributor steadily tapers from the oil distributor on the bearing housing (8) to the bearing body (9).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other advantageous further developments of the invention are shown in more detail by way of the FIGURE in the following together with the description of the preferred embodiment of the invention. In the drawing:

[0015] The FIGURE is a sectional view of an exhaust gas turbocharger having a compressor wheel, a turbine and a shaft which rotatably interconnects the compressor wheel and the turbine.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

[0016] In the FIGURE, a sectional view of an exhaust gas turbocharger 1 having a compressor wheel 2, a turbine 3 and a shaft 4, which rotatably interconnects the compressor wheel 2 and the turbine 3, is shown. On the shaft 4 a thrust ring 6, preferentially a one-piece thrust ring 6, is arranged, which indirectly connects the shaft 4 with the bearing 5 and is configured to transmit the axial forces acting on the shaft 4 both in a thrust direction S and also in the counter-thrust direction GS opposite to the thrust direction. The thrust ring 6 is hollow-cylindrically and non-positively arranged on the shaft 4. Furthermore, the thrust ring 6, at an end facing to the turbine 3, extends at a right angle to the outside such that the sectional view is L-shaped. Through this extent, the thrust ring 6 has a thrust surface 7 and a counter-thrust surface 14. For absorbing the axial force in the thrust direction S, the thrust surface 7 lies against the bearing 5 such that axial forces in the direction of the compressor wheel 2 are absorbed by the bearing 5. By contrast, for absorbing the axial force in the counter-thrust direction GS, the counter-thrust surface 14 lies against the bearing 5 such that axial forces in the direction of the turbine 3 are absorbed by the bearing 5. In addition to this, the thrust ring 6 lies against a shaft shoulder 11 with a part of the counter-thrust surface 14. The diameter of the shaft 4 from the shaft shoulder 11 in the direction of the turbine 3 has a larger diameter than a diameter of the shaft 4 from the shaft shoulder 11 in the direction of the compressor wheel 2.

[0017] Furthermore, the bearing 5 is formed of a bearing housing 8 and a bearing body 9 of a stator 10 of the exhaust gas turbocharger 1. In the bearing body 9, a thrust bearing is integrated which is in contact with the thrust surface 7 of the thrust ring 6 and is configured to absorb axial forces in the direction of the compressor wheel 2. Within the bearing housing 8, a region 15 is formed in which water or oil for the lubrication of the exhaust gas turbocharger is provided. Furthermore, the bearing housing 8 comprises a recess against which the thrust ring 6 lies with the counter-thrust surface 14 for absorbing the axial forces in the direction of the turbine 3. On this recess, a through-opening is arranged in the bearing housing 8 which is configured to discharge the water or the oil for lubrication to an oil drain 16.

[0018] Furthermore, the bearing 5 comprises bores, passages and an oil distributor for supplying the bearing 5 with lubricant. There, the cross-sectional area of the bores, passages and of the oil distributor steadily tapers from the oil distributor on the bearing housing 8 to the bearing body 9.

[0019] Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.