Abstract: Methods and systems for thermal management of data processing systems are disclosed. To improve the likelihood of computer implemented services being provided, the systems may thermally manage the temperatures of various components of the data processing system under a variety of operating conditions. To warm the components, the system may include fans usable to generate a circulation airflow and heaters to generate heat to warm the airflow. To cool the components, the system may include fans usable to generate a through enclosure airflow to bring in cool air and expel warm air. The fans may be managed via a control system that includes multiple management entities that may operate under different ranges of thermal conditions and may be capable of performing various analysis for ascertaining how to operate the fans and heaters to thermally manage the system.

Abstract: A variable turbine geometry (VTG) turbocharger is disclosed. The VTG turbocharger may comprise a turbine section having a turbine wheel and plurality of guide vanes configured to regulate a flow of exhaust gases to the turbine wheel. The VTG turbocharger may further comprise an actuation pivot shaft (APS) configured to mediate actuation of opening and closing of the guide vanes, a bushing rotatably supporting the APS with a clearance therebetween, and a radial seal circumscribing the APS and inserted in a cavity of the bushing. The radial seal may form an interference fit with both an outer diameter of the APS and an inner diameter of the bushing to seal a leakage of the exhaust gases between the clearance between the APS and the bushing.

Abstract: A variable turbine geometry (VTG) turbocharger is disclosed. The VTG turbocharger may comprise a turbine section, a bearing section, and an actuation pivot shaft (APS) having a bearing side in the bearing section and a pressure side in the turbine section. The VTG turbocharger may further comprise a bushing surrounding the APS and extending from a first end at the pressure side to a second end at the bearing side. In addition, the VTG turbocharger may further comprise a face seal assembly including a cup spring and a composite ring seal circumscribing the APS at the pressure side, with the cup spring forming a face seal with the first end of the bushing. The face seal assembly may further include a spring circumscribing the APS at the bearing side and engaging the second end of the bushing.

Abstract: A variable turbine geometry (VTG) turbocharger is disclosed. The VTG turbocharger may comprise a turbine section having a turbine wheel and plurality of guide vanes configured to regulate a flow of exhaust gases to the turbine wheel. The VTG turbocharger may further comprise an actuation pivot shaft (APS) configured to mediate actuation of opening and closing of the guide vanes, a bushing rotatably supporting the APS with a clearance therebetween, and a radial seal circumscribing the APS and inserted in a cavity of the bushing. The radial seal may form an interference fit with both an outer diameter of the APS and an inner diameter of the bushing to seal a leakage of the exhaust gases between the clearance between the APS and the bushing.

Abstract: A variable turbine geometry (VTG) turbocharger is disclosed. The VTG turbocharger may comprise a turbine section, a bearing section, and an actuation pivot shaft (APS) having a bearing side in the bearing section and a pressure side in the turbine section. The VTG turbocharger may further comprise a bushing surrounding the APS and extending from a first end at the pressure side to a second end at the bearing side. In addition, the VTG turbocharger may further comprise a face seal assembly including a cup spring and a composite ring seal circumscribing the APS at the pressure side, with the cup spring forming a face seal with the first end of the bushing. The face seal assembly may further include a spring circumscribing the APS at the bearing side and engaging the second end of the bushing.

Abstract: A Variable Turbine Geometry (VTG) turbine turbocharger comprises a turbine wheel in a housing, and a compressor wheel coupled to the turbine wheel with a main shaft. The turbocharger additionally includes a VTG assembly in the housing, an actuator outside the housing, and an actuation pivot shaft that extends through an opening of the housing and connects the VTG assembly to the actuator. A face seal assembly seals the opening, and includes an inner ring member rotationally fixed on the pivot shaft, a disc member, and a spring seal. The disc member includes a first face that forms a seal with a surface of the housing, and is rotationally fixed to, while being movable axially relative to, the inner ring member. The spring seal seals the inner ring member and the disc member, and applies a seating force against the disc member.

Abstract: A Variable Turbine Geometry (VTG) turbine turbocharger comprises a turbine wheel in a housing, and a compressor wheel coupled to the turbine wheel with a main shaft. The turbocharger additionally includes a VTG assembly in the housing, an actuator outside the housing, and an actuation pivot shaft that extends through an opening of the housing and connects the VTG assembly to the actuator. A face seal assembly seals the opening, and includes an inner ring member rotationally fixed on the pivot shaft, a disc member, and a spring seal. The disc member includes a first face that forms a seal with a surface of the housing, and is rotationally fixed to, while being movable axially relative to, the inner ring member. The spring seal seals the inner ring member and the disc member, and applies a seating force against the disc member.