Abstract:
Turbochargers use actuators to control wastegate valve or VTG vane position to control turbine wheel power. Components of such actuators are susceptible to damage when exposed to foreign liquids, solids and debris. To prevent such ingress, boot seals at the actuator shaft can provide a tortuous path for air aspiration and expulsion from the volume inside the actuator boot is provided at one or more interfaces in the actuator system. Such a path can also prevent ingress of undesired liquids, solid and debris, which can affect actuator performance material. In one arrangement, a tortuous pathway is provided between a boot seal holder and another actuator component. In another arrangement, a tortuous pathway is provided between the actuator shaft and an end portion of a boot seal.
Abstract:
Modern turbochargers use speed sensors to determine the shaft speed during operation. In order to replace a speed sensor in a turbocharger with journal bearings separated by a spacer, the tip of the speed sensor must be withdrawn from a window in the spacer and replaced through the same window. If the spacer turns while the sensor is removed, then the window will be out of alignment with the axis of the sensor and the sensor cannot be re-inserted through the window. An insert is provided for preventing rotation of the window in the spacer while the sensor is withdrawn. The insert also prevents wear to the speed sensor from the fluctuating contact forces transmitted from the shaft to the bearing spacer and subsequently to the speed sensor. Accordingly, the durability of the speed sensor is improved, the rate of failure and need for sensor replacement, is reduced.
Abstract:
A modular tensioner system for an engine including a modular tensioner and an application specific carrier (15). The modular tensioner includes an integral anti-rotation device (14, 24, 202), backlash adjustability, and damping element. The plunger (8, 58, 108, 158), sleeve (1, 70a, 70b, 101, 151, 270a, 270b), clip (9, 59, 109, 159), retainer (6, 106), spring (4, 54, 104, 154), and hydraulic vent device (7, 57, 107, 157, 307) may be packaged as a modular assembly with the ability to mate with various suitable carriers (15).