Actuating mechanism and gear driven adjustment ring for a variable geometry turbocharger
A variable geometry turbine turbocharger ( 1 ) includes a gear driven adjustment ring actuator mechanism ( 300 ) supported within a housing ( 16 ) via a resilient mount ( 70 ) disposed between the mechanism ( 300 ) and housing ( 16 ). The gear driven adjustment ring actuator mechanism ( 300 ) rotates an adjustment ring ( 350 ), which in turn adjusts the position of the vanes ( 30 ) of the variable geometry turbine ( 2 ). The resilient mount ( 70 ) accommodates the heat-related expansion and contraction of the gear driven adjustment ring actuator mechanism ( 300 ).
1. A gear driven adjustment ring actuator mechanism ( 100 ) for a variable turbine geometry turbocharger ( 1 ), comprising an adjustment ring ( 150 ) including a rack gear ( 140 ) and a vane arm ( 136 ) attached to a vane ( 30 ) configured to vary the geometry of a turbine ( 2 ) of the turbocharger ( 1 ), wherein the gear driven adjustment ring actuator mechanism ( 100 ) is configured to control rotational movement of the vane ( 30 ) wherein the adjustment ring ( 150 ) includes a first set of gear teeth ( 346 , 446 ) disposed in alignment with an inner diameter of the adjustment ring ( 350 , 450 ), further including a pinion gear 160 having pinion teeth ( 162 ) and wherein the rack gear ( 140 ) includes rack gear teeth ( 142 ) that engage with the pinion teeth ( 162 ), wherein the adjustment ring ( 350 , 450 ) further includes a second set of gear teeth ( 342 , 442 ), disposed in radial alignment with an outer diameter of the adjustment ring ( 350 , 450 ) so that the pinion teeth engages the rack teeth.
2. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 1 wherein the rack gear ( 140 ) is formed separately from the adjustment ring ( 150 ).
3. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 1 wherein the adjustment ring ( 150 , 350 ) and the rack gear ( 140 , 340 ) are formed as an integral unit.
4. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 1 wherein the rack gear teeth ( 142 ) are formed on a radially inward-facing surface of the rack gear ( 140 ).
5. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 1 wherein the rack gear teeth ( 242 ) are formed on a radially outward-facing surface of the rack gear ( 240 ).
6. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 1 wherein the rack gear ( 140 , 240 , 440 ) is attached to the adjustment ring ( 150 , 450 ) and the rack gear teeth ( 142 , 242 , 442 ) are positioned radially outwardly relative to an outer edge of the adjustment ring ( 150 , 450 ) and in alignment with an outer diameter of the adjustment ring ( 150 , 450 ).
7. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 3 further including a pinion gear ( 160 ) having pinion teeth ( 162 ) and wherein the adjustment ring ( 350 ) further includes teeth ( 342 , 346 ) formed in at least a portion of a radially inward-facing edge ( 356 ) and a radially outward-facing edge ( 354 ) and wherein the pinion teeth ( 162 ) engage with the teeth ( 342 ) formed in the radially outward-facing edge ( 354 ) of the adjustment ring ( 350 ).
8. A gear driven adjustment ring actuator mechanism ( 100 ) for a variable turbine geometry turbocharger ( 1 ), comprising an adjustment ring ( 150 ) including a rack gear ( 140 ) and a vane arm ( 136 ) attached to a vane ( 30 ) configured to vary the geometry of a turbine ( 2 ) of the turbocharger ( 1 ), wherein the gear driven adjustment ring actuator mechanism ( 100 ) is configured to control rotational movement of the vane ( 30 ) wherein the adjustment ring ( 150 ) includes a first set of gear teeth ( 346 , 446 ) disposed in radial alignment with an inner diameter of the adjustment ring ( 350 , 450 ), wherein
the vane arm ( 336 ) includes teeth ( 337 ),
the adjustment ring ( 350 , 450 ) further includes teeth ( 346 , 446 ) formed in at least a portion of a radially inward-facing edge and a radially outward-facing edge of the adjustment ring ( 350 , 450 ), and
the teeth ( 337 ) of the vane arm ( 336 ) engage with the teeth ( 346 , 446 ) formed in the radially inward-facing edge of the adjustment ring ( 150 ).
9. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 1 further including an actuator pivot shaft ( 52 ) connected to the gear driven adjustment ring actuator mechanism ( 100 ) and the actuator pivot shaft ( 52 ) is rotatably supported in a bearing housing ( 16 ), wherein a resilient mount ( 70 ) is disposed between the actuator pivot shaft ( 52 ) and the bearing housing ( 16 ).
10. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 6 further including an actuator pivot shaft ( 52 ) connected to the gear driven adjustment ring actuator mechanism ( 100 ) and the actuator pivot shaft ( 52 ) is rotatably supported in a bearing housing ( 16 ), wherein a resilient mount ( 70 ) is disposed between the actuator pivot shaft ( 52 ) and the bearing housing ( 16 ).
11. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 7 further including an actuator pivot shaft ( 52 ) connected to the gear driven adjustment ring actuator mechanism ( 100 ) and the actuator pivot shaft ( 52 ) is rotatably supported in a bearing housing ( 16 ), wherein a resilient mount ( 70 ) is disposed between the actuator pivot shaft ( 52 ) and the bearing housing ( 16 ).
12. The gear driven adjustment ring actuator mechanism ( 100 ) according to claim 8 further including an actuator pivot shaft ( 52 ) connected to the gear driven adjustment ring actuator mechanism ( 100 ) and the actuator pivot shaft ( 52 ) is rotatably supported in a bearing housing ( 16 ), wherein a resilient mount ( 70 ) is disposed between the actuator pivot shaft ( 52 ) and the bearing housing ( 16 ).