CPC F16C 17/028 (2013.01) [F01D 25/166 (2013.01); F16C 17/18 (2013.01); F16C 17/26 (2013.01); F16C 2360/24 (2013.01)] | 18 Claims |
1. A bearing element for use in a turbocharger comprising:
an inner surface having a smooth profile and comprising a plurality of sections, each section having a taper portion between a first arc-span point and a second arc-span point, a constant-radius portion between the second arc-span point and a third arc-span point, and a transition portion between the third arc-span point and a fourth arc-span point; and
an inner-surface radius dimension that changes from an inner-diameter major dimension at the first arc-span point to an inner-diameter minor dimension at the second arc-span point and changes from the inner-diameter minor dimension at the third arc-span point to the inner-diameter major dimension at the fourth arc-span point;
wherein:
the inner surface having the smooth profile comprises a continuous surface at the first, second, third, and fourth arc-span points; and
the fourth arc-span point of a first section adjoins the first arc-span point of a subsequent section, and the inner-surface radius dimension decreases at a constant rate per degree of angular direction through at least half of the taper portion.
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6. A bearing element for use in a turbocharger comprising:
an inner surface configured to receive a cylindrical shaft, the inner surface having a smooth profile and comprising a plurality of sections, each section having a taper portion between a first arc-span point and a second arc-span point, a constant-radius portion between the second arc-span point and a third arc-span point, and a transition portion between the third arc-span point and a fourth arc-span point;
an inner-surface radius dimension that changes from an inner-diameter major dimension at the first arc-span point to an inner-diameter minor dimension at the second arc-span point and changes from the inner-diameter minor dimension at the third arc-span point to the inner-diameter major dimension at the fourth arc-span point;
a first angular distance between the first arc-span point and the second arc-span point; and
a second angular distance between the third arc-span point and the fourth arc-span point, the second angular distance being larger than the first angular distance; wherein:
the inner surface having the smooth profile comprises a continuous surface at the first, second, third, and fourth arc-span points; and
the fourth arc-span point of a first section adjoins a first arc-span point of a subsequent section; and the inner-surface radius dimension decreases at a constant rate per degree of angular direction through at least half of the taper portion.
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17. A turbocharger bearing system comprising:
a first bearing element having:
an inner surface configured to receive a cylindrical shaft, the inner surface having a smooth profile and comprising a plurality of sections, each section having a taper portion between a first arc-span point and a second arc-span point, a constant-radius portion between the second arc-span point and a third axe-span point, and a transition portion between the third arc-span point and a fourth arc-span point;
an inner-surface radius dimension that changes from an inner-diameter major dimension at the first arc-span point to an inner-diameter minor dimension at the second arc-span point and changes from the inner-diameter minor dimension at the third arc-span point to the inner-diameter major dimension at the fourth arc-span point;
a first angular distance between the first arc-span point and the second arc-span point; and
a second angular distance between the third arc-span point and the fourth arc-span point, the first angular distance being larger than the second angular distance; wherein:
the inner surface having the smooth profile comprises a continuous surface at the first, second, third, and fourth arc-span points; and
the fourth arc-span point of a first section adjoins the first arc-span point of a subsequent section; and
a second bearing element configured to receive the cylindrical shaft; at least one of the first and second bearing elements comprises a bearing element having a varying ID-major dimension along a longitudinal axis; and the other of the first and second bearing elements comprises a bearing element having a constant ID-major dimension along the longitudinal axis.
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