TURBOCHARGER BEARING ASSEMBLY AND METHOD FOR PROVIDING THE SAME
An integrated bearing assembly includes a thrust bearing disposed along a face of a turbocharger casing in a turbocharger and extending circumferentially around an axis of rotation of a rotor of the turbocharger, and a dual film journal bearing radially disposed between the rotor and the turbocharger casing. The journal bearing includes a shoulder step radially extending away from the rotor. The shoulder step of the journal bearing engages one or more of the thrust bearing or the turbocharger casing to prevent axial movement of the journal bearing relative to the one or more of the thrust bearing or the turbocharger casing.
1 . An integrated bearing assembly comprising:
a thrust bearing disposed along a face of a turbocharger casing in a turbocharger and extending circumferentially around an axis of rotation of a rotor of the turbocharger; and
a dual film journal bearing radially disposed between the rotor and the turbocharger casing, wherein the journal bearing includes a shoulder step radially extending away from the rotor, wherein the shoulder step of the journal bearing engages one or more of the thrust bearing or the turbocharger casing to prevent axial movement of the journal bearing relative to the one or more of the thrust bearing or the turbocharger casing.
2 . The bearing assembly of claim 1 , wherein the thrust bearing includes a recess radially extending into the thrust bearing away from the rotor, and wherein the shoulder step of the journal bearing extends into the recess.
3 . The bearing assembly of claim 2 , wherein the recess in the thrust bearing and the shoulder step in the journal bearing both circumferentially extend around the axis of rotation of the rotor, wherein the shoulder step in the journal bearing and the recess in the thrust bearing include flat segments that mate with each other to prevent rotation of the journal bearing relative to the thrust bearing.
4 . The bearing assembly of claim 1 , wherein the shoulder step of the journal bearing radially extends away from the rotor and along a surface of the turbocharger casing that also engages the thrust bearing.
5 . The bearing assembly of claim 1 , wherein the shoulder step of the journal bearing is spaced apart from the turbocharger casing along axial directions that are parallel to the axis of rotation of the rotor with a portion of the thrust bearing disposed between the shoulder step of the journal bearing and the turbocharger casing along the axial directions.
6 . The bearing assembly of claim 1 , wherein the shoulder step of the journal bearing radially extends away from the rotor and into a recess in the turbocharger casing.
7 . The bearing assembly of claim 1 , wherein the shoulder step of the journal bearing radially extends away from the rotor and along a surface of the thrust bearing that also engages the turbocharger casing.
8 . The bearing assembly of claim 1 , further comprising one or more dowel pins that engage with the thrust bearing and the turbocharger casing along axial directions that are parallel to the axis of rotation of the rotor.
9 . The bearing assembly of claim 8 , wherein the one or more dowel pins secure the thrust bearing in a position with respect to the turbocharger casing and restrict rotation of the bearing assembly.
10 . An integrated bearing assembly comprising:
a thrust bearing disposed along a face of a turbocharger casing, the thrust bearing including a recess along an inner diameter of the thrust bearing; and
a dual film journal bearing radially disposed between a rotor and the turbocharger casing, wherein the journal bearing includes a shoulder step radially extending away from the rotor toward the thrust bearing, wherein the shoulder step of the journal bearing prevents axial movement of the journal bearing by engaging one or more of the thrust bearing or the turbocharger casing.
11 . The bearing assembly of claim 10 , wherein the shoulder step of the journal bearing radially extends along a surface of the turbocharger casing that also engages the thrust bearing.
12 . The bearing assembly of claim 10 , wherein the thrust bearing includes a recess that radially extends into the thrust bearing in directions away from the rotor, wherein the shoulder step of the journal bearing extends into the recess.
13 . The bearing assembly of claim 10 , wherein the shoulder step of the journal bearing is spaced apart from the turbocharger casing such that a portion of the thrust bearing is disposed between the shoulder step of the journal bearing and the turbocharger casing.
14 . The bearing assembly of claim 10 , wherein the shoulder step of the journal bearing radially extends into the turbocharger casing in directions away from the rotor.
15 . The bearing assembly of claim 10 , wherein the shoulder step of the journal bearing radially extends along a surface of the thrust bearing that also engages the turbocharger casing.
16 . The bearing assembly of claim 10 , wherein the turbocharger casing includes a recess radially extending into the turbocharger casing, and wherein the shoulder step of the journal bearing extends into the recess.
17 . A method comprising:
obtaining a semi-floating journal bearing of a turbocharger having an outwardly and radially extending shoulder step;
positioning the journal bearing into a casing of the turbocharger; and
positioning a thrust bearing onto a surface of the casing of the turbocharger such that the shoulder step of the journal bearing engages one or more of the thrust bearing or the casing of the turbocharger to prevent axial movement of the journal bearing relative to the one or more of the thrust bearing or the casing of the turbocharger.
18 . The method of claim 17 , wherein positioning the thrust bearing onto the surface of the casing of the turbocharger includes positioning the thrust bearing such that the shoulder step of the journal bearing extends into a recess of the thrust bearing and extends along the surface of the casing of the turbocharger.
19 . The method of claim 17 , wherein positioning the thrust bearing onto the surface of the casing of the turbocharger includes positioning the thrust bearing such that the shoulder step of the journal bearing extends into a recess of the casing of the turbocharger.
20 . The method of claim 17 , wherein positioning the thrust bearing onto the surface of the casing of the turbocharger includes positioning the thrust bearing such that the shoulder step of the journal bearing is radially spaced apart from the casing of the turbocharger.
21 . The method of claim 17 , further comprising placing one or more dowel pins through holes in the thrust bearing and the casing of the turbocharger to prevent rotation of the thrust bearing relative to the casing of the turbocharger.