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A product is disclosed for inhibiting oil from entering a turbocharger compressor. A compressor wheel may be disposed in a wheel chamber of a housing to rotate at a range of speeds. The compressor wheel may be surrounded by a collection volute with a diffuser channeling air from the wheel chamber to

A product is disclosed for inhibiting oil from entering a turbocharger compressor. A compressor wheel may be disposed in a wheel chamber of a housing to rotate at a range of speeds. The compressor wheel may be surrounded by a collection volute with a diffuser channeling air from the wheel chamber to the collection volute. A shaft may extend through the housing and may be connected to the compressor wheel. The shaft may be supported by a bearing that may be lubricated through an oil circuit. A pressure differential between the wheel chamber and the oil circuit inhibits oil from entering the wheel chamber. The pressure differential may be maintained during rotation of the compressor wheel at a low end of the range of speeds by a collar disposed near a tip of the compressor wheel at an entrance to the diffuser.

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1. A product for inhibiting oil from entering a turbocharger compressor comprising: a housing with a compressor wheel disposed in a wheel chamber of the housing to rotate at a range of speeds, the compressor wheel surrounded by a collection volute with a diffuser channeling air from the wheel chambe

1. A product for inhibiting oil from entering a turbocharger compressor comprising: a housing with a compressor wheel disposed in a wheel chamber of the housing to rotate at a range of speeds, the compressor wheel surrounded by a collection volute with a diffuser channeling air from the wheel chamber to the collection volute; a shaft extended through the housing, the shaft connected to the compressor wheel and the shaft supported by a bearing, the bearing lubricated through an oil circuit; wherein a pressure differential between the wheel chamber and the oil circuit inhibits oil from entering the wheel chamber; and wherein the pressure differential is maintained during rotation of the compressor wheel at a low end of the range of speeds by a collar disposed near a tip of the compressor wheel at an entrance to the diffuser, and a retainer engaged in the housing, the retainer holding the collar in a groove of the housing, wherein an opening extends through the housing from the diffuser to the groove, the opening entering the groove at a port located between the retainer and the collar. 2. The product according to claim 1 further comprising a spring biasing the collar toward the wheel, wherein during rotation of the wheel at speeds above the low end of the range of speeds, the pressure differential causes the collar to slide to compress the spring. 3. The product according to claim 2 wherein during rotation of the wheel at the low end of the range of speeds the spring biases the collar to direct air from a tip of the wheel to a shaft side of the wheel, to increase pressure on the shaft side of the wheel. 4. The product according to claim 2 wherein the spring is disposed in a chamber of the housing behind the collar and wherein a vent extends from the chamber and through the housing. 5. The product according to claim 1 wherein the collar includes a cavity, and wherein the port is aligned with the cavity. 6. A product for inhibiting oil from entering a turbocharger compressor comprising: a housing with a compressor wheel disposed in a wheel chamber of the housing to rotate at a range of speeds, the compressor wheel surrounded by a collection volute with a diffuser channeling air from the wheel chamber to the collection volute; a shaft extended through the housing, the shaft connected to the compressor wheel and the shaft supported by a bearing, the bearing lubricated through an oil circuit; wherein a pressure differential between the wheel chamber and the oil circuit inhibits oil from entering the wheel chamber; and wherein the pressure differential is maintained during rotation of the compressor wheel at a low end of the range of speeds by a collar disposed near a tip of the compressor wheel at an entrance to the diffuser, wherein the collar includes a disk section extending along the diffuser and a spring section joining with the disk section and biasing the disk section to vary the diffuser in response to the pressure differential. 7. A product for use with a turbocharger comprising: a compressor wheel connected to and rotating with a shaft, the compressor wheel disposed in a compressor housing, wherein rotation of the compressor wheel generates a pressure that varies; a bearing disposed in a bearing housing, the bearing rotatably supporting the shaft, the bearing housing including an annular groove formed in a radial location outside a circumferential tip of the compressor wheel; and a collar disposed in the annular groove, wherein at least a part of the collar moves in the groove in an outward direction when the compressor wheel rotates at a relatively slow speed and at least the part of the collar moves in the groove in an inward direction solely in response to the pressure when the compressor wheel rotates at a relatively fast speed. 8. The product according to claim 7 wherein the compressor wheel includes a tip on a radial outer circumference of the compressor wheel, and wherein a diffuser extends outward from the tip, rotation of the compressor wheel generating a flow through the diffuser, and further comprising a spring biasing the collar in the outward direction wherein during rotation of the compressor wheel at the relatively fast speed, a pressure differential causes the collar to slide in the inward direction, moving the collar completely into the annular groove so that the diffuser is fully open from the tip radially outward, without the collar restricting flow. 9. The product according to claim 7 wherein the compressor wheel includes a first side with a number of vanes and a back side opposite the first side, wherein during rotation of the compressor wheel at the relatively low speed, a spring causes the collar to slide in the outward direction from the back side of the compressor wheel toward the first side wherein the collar directs at least part of the pressure to the back side of the compressor wheel. 10. The product according to claim 7 further comprising a retainer engaged in the bearing housing, the retainer holding the collar in the annular groove of the bearing housing. 11. The product according to claim 7 wherein the compressor wheel includes a first side that has a number of vanes and a back side opposite the first side, wherein the back side faces the bearing housing so that a space is defined between the back side and the bearing housing and wherein the collar is positioned directly radially outside both the space and a part of the compressor wheel. 12. A product for use with a turbocharger comprising: a compressor wheel connected to and rotating with a shaft, the compressor wheel disposed in a compressor housing, wherein rotation of the compressor wheel generates a pressure that varies; a bearing disposed in a bearing housing, the bearing rotatably supporting the shaft, the bearing housing including an annular groove formed in a radial location outside a circumferential tip of the compressor wheel; and a collar disposed in the annular groove, wherein at least a part of the collar moves in the groove in an outward direction when the compressor wheel rotates at a relatively slow speed and at least the part of the collar moves in the groove in an inward direction solely in response to the pressure when the compressor wheel rotates at a relatively fast speed, and a retainer engaged in the bearing housing, the retainer holding the collar in the annular groove of the bearing housing, wherein an opening extends through the bearing housing from a diffuser channel to the annular groove, the opening entering the annular groove at a port located between the retainer and the collar. 13. A product for use with a turbocharger comprising: a compressor wheel connected to and rotating with a shaft, the compressor wheel disposed in a compressor housing, wherein rotation of the compressor wheel generates a pressure that varies; a bearing disposed in a bearing housing, the bearing rotatably supporting the shaft, the bearing housing including an annular groove formed in a radial location outside a circumferential tip of the compressor wheel; and a collar disposed in the annular groove, wherein at least a part of the collar moves in the groove in an outward direction when the compressor wheel rotates at a relatively slow speed and at least the part of the collar moves in the groove in an inward direction solely in response to the pressure when the compressor wheel rotates at a relatively fast speed, wherein the collar includes a cavity, wherein an opening extends through the bearing housing from a diffuser channel to the annular groove, the opening entering the annular groove at a port, the port aligned with the cavity. 14. A product for use with a turbocharger comprising: a compressor wheel connected to and rotating with a shaft, the compressor wheel disposed in a compressor housing, wherein rotation of the compressor wheel generates a pressure that varies; a bearing disposed in a bearing housing, the bearing rotatably supporting the shaft, the bearing housing including an annular groove formed in a radial location outside a circumferential tip of the compressor wheel; and a collar disposed in the annular groove, wherein at least a part of the collar moves in the groove in an outward direction when the compressor wheel rotates at a relatively slow speed and at least the part of the collar moves in the groove in an inward direction solely in response to the pressure when the compressor wheel rotates at a relatively fast speed, and a diffuser channel wherein the collar includes a disk section extending along the diffuser channel and a spring section joining with the disk section and biasing the disk section to vary the diffuser channel in response to a pressure generated by the compressor wheel. 15. A turbocharger system comprising: a housing assembly having a compressor wheel cavity and a bearing cavity; a compressor wheel rotatably disposed in the compressor wheel cavity; a bearing disposed in the bearing cavity; a shaft connected to the compressor wheel and extending through the bearing for support; wherein the compressor wheel includes a circumferential tip; wherein a diffuser channel extends through the housing assembly from the compressor wheel cavity to a collection volute; wherein the housing assembly has an annular groove facing the diffuser channel near the circumferential tip; wherein a collar is slidably moveably disposed in the annular groove, the collar sliding into and out of the diffuser channel in response to a pressure generated by a rotational speed of the compressor wheel, a spring disposed in the annular groove behind the collar, the spring biasing the collar out of the annular groove, a retainer engaged in the housing assembly, the retainer holding the collar in the annular groove wherein an opening extends through the housing assembly from the diffuser channel to the annular groove, the opening entering the annular groove at a port located between the retainer and the collar. 16. The turbocharger system according to claim 15 wherein the collar includes a cavity, wherein the port is aligned with the cavity. 17. A product for use with a turbocharger comprising: a compressor wheel connected to and rotating with a shaft, the compressor wheel disposed in a compressor housing, wherein rotation of the compressor wheel generates a pressure that varies; a bearing disposed in a bearing housing, the bearing rotatably supporting the shaft, the bearing housing including an annular groove formed in a radial location outside a circumferential tip of the compressor wheel; and a collar disposed in the annular groove, wherein at least a part of the collar moves in the groove in an outward direction when the compressor wheel rotates at a relatively slow speed and at least the part of the collar moves in the groove in an inward direction solely in response to the pressure when the compressor wheel rotates at a relatively fast speed, and a retainer engaged in the bearing housing, the retainer holding the collar in the annular groove of the bearing housing, and a spring biasing the collar in the outward direction, wherein the spring is disposed in a chamber of the annular groove behind the collar, wherein a vent extends from the chamber and through the housing, and wherein an opening extends through the retainer, the opening registering with the vent.