The present invention relates to an oil-free turbocharger assembly using an airfoil bearing that may be useful in high speed conditions. The assembly can be cooled easily. A heat-proof coating can also be easily applied to the turbo charger's rotating shaft. In one embodiment, an oil-free turbocharg
The present invention relates to an oil-free turbocharger assembly using an airfoil bearing that may be useful in high speed conditions. The assembly can be cooled easily. A heat-proof coating can also be easily applied to the turbo charger's rotating shaft. In one embodiment, an oil-free turbocharger assembly has a constant distance between a journal portion and a rotating shaft so that the mass of the rotating body can be minimized and the rotating body assembly can have a small moment of inertia. The turbocharger in some embodiments of the invention may be cooled by a refrigerant which improves cooling efficiency. Each part of the rotating body assembly in some embodiments may be individually treated with a heat-proof process so that productivity can be improved.
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1. An oil-free turbocharger assembly comprising: a housing having an inner surface;a rotational body assembly including a rotating shaft positioned inside the housing, an impeller being coupled to one end of the rotating shaft, a turbine coupled to the other end of the rotating shaft, a journal port
1. An oil-free turbocharger assembly comprising: a housing having an inner surface;a rotational body assembly including a rotating shaft positioned inside the housing, an impeller being coupled to one end of the rotating shaft, a turbine coupled to the other end of the rotating shaft, a journal portion coupled to a periphery of the rotating shaft, and a thrust pad coupled to the journal portion, wherein:the thrust pad defines coupling holes, andthe journal portion has coupling projections extending axially from an impeller side end portion of the journal portion to engage the coupling holes,a journal bearing located on the inner surface of the housing, the journal bearing configured to support the journal portion during rotational driving thereof; anda thrust bearing configured to axially support the thrust pad, wherein:the rotating shaft comprises a fastening portion having a diameter larger than other portions of the rotating shaft,the journal portion has a cylindrical fastening recess in which the fastening portion is inserted and coupled and a cylindrical portion located axially opposite the fastening recess and having a cylindrical recess, wherein an inner wall of the journal portion that radially circumscribes the cylindrical fastening recess also radially circumscribes the coupled fastening portion,the fastening recess has a diameter corresponding to the diameter of the fastening portion such that the fastening portion is fitted to the fastening recess,the cylindrical portion is located in spaced-relation from the rotating shaft that is inserted in the cylindrical recess with a constant distance therebetween such that a space is formed between the rotating shaft and the cylindrical portion and such that a mass of the rotating assembly is reduced,the thrust pad is a circular disk coaxially disposed with respect to the rotating shaft, andthe rotating shaft, the journal portion, and the thrust pad are manufactured individually and assembled into an integrated body. 2. The turbocharger assembly of claim 1, wherein the rotating shaft, the journal portion, and the thrust pad of the rotational body assembly are each treated with a heat-proof process prior to assembly. 3. The turbocharger assembly of claim 2, wherein the rotating shaft, the journal portion, and the thrust pad are treated with a solid-lubricant coating process, an abrasion process, and a polishing process respectively. 4. The turbocharger assembly of claim 3, wherein the turbocharger assembly further comprises a fastening member having a fastening projection located in a central coupling hole of the thrust pad toward the turbine. 5. The turbocharger assembly of any one of claims 1 to 4, wherein the journal bearing is an airfoil bearing configured to form dynamic pressure so as to support the rotational body assembly during rotation of the journal portion of the rotating shaft. 6. The turbocharger assembly of any one of claims 1 to 4, wherein the thrust bearing is an airfoil bearing configured to form dynamic pressure so as to axially support the rotational body assembly during rotation of the thrust pad. 7. The turbocharger assembly of claim 6, wherein the thrust bearing is an airfoil bearing having a top foil and a bump foil having cuts in a radial direction at regular intervals. 8. The turbocharger assembly of claim 1, further comprising a cooler configured to cool the outer surface of the housing corresponding to the journal portion. 9. The turbocharger assembly of claim 8, further comprising a plurality of cooling fins circumferentially disposed around the housing. 10. The turbocharger assembly of claim 8 or 9, wherein the cooler is connected to an intercooler and the refrigerant circulates throughout the housing, the refrigerant being circulated within the intercooler so as to be reintroduced into the cooler. 11. The turbocharger assembly of claim 10, wherein the refrigerant is a cooling engine-oil substance. 12. The turbocharger assembly of claim 10, wherein the refrigerant is a cooling water substance. 13. An oil-free turbocharger assembly comprising: a housing having an inner surface;a rotational body assembly including: a rotating shaft positioned inside the housing;an impeller being coupled to one end of the rotating shaft;a turbine coupled to the other end of the rotating shaft;a journal portion coupled to a periphery of the rotating shaft, wherein a first plurality of coupling projections extend axially from an impeller side end portion of the journal portion, and the journal portion has a cylindrical portion located in spaced-relation from the rotating shaft with a constant distance therebetween;a thrust pad coupled to the journal portion, wherein the thrust pad is a circular disk coaxially disposed with respect to the rotating shaft, and includes coupling holes; anda coupling member coupled to the thrust pad, wherein a second plurality of coupling projections extend axially from a turbine side of the coupling member; wherein the first plurality of coupling projections and second plurality of coupling projections engage the coupling holes;a journal bearing located on the inner surface of the housing, the journal bearing configured to support the journal portion during rotational driving thereof; anda thrust bearing configured to axially support the thrust pad.
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