Abstract: The disclosure illustrates an air temperature sensing viscous fluid fan drive having an inexpensively manufactured housing which defines, in part, an annular working fluid chamber for a disk connected to an input shaft. The housing comprises a spider of sintered steel having a hub which receives a bearing for journaling the shaft. A series of integral radial arms have bosses at their tips for accurately mounting a fan. A ferrous metal disk is welded to the spider to form one wall of the working fluid chamber, the other of which is defined by an aluminum cover assembly. The ferrous housing maintains concentricity of the fan and housing relative to the input shaft irrespective of changes in temperature.

Abstract: The disclosure illustrates having a turbocharger housing and a turbine wheel shaft rotatable relative to one another and in which one of the members has a cylindrical surface and the other member contains an annular groove, a sealing ring being located in the annular groove and engaging the cylindrical surface. One of the radially extending walls of the sealing ring includes a chamfered portion such that the axial dimension of the radially inner surface of the sealing ring is less than the axial dimension of the radially outer surface of the sealing ring, the annular groove including a complementary shaped wedging surface for cooperation with the chamfered surface of the sealing ring.

Abstract: The disclosure illustrates a tuned viscous torsional vibration damper having a hub member for attachment to an internal combustion engine crankshaft. An annular inertia mass is journaled within the hub member to form a working chamber which contains a viscous liquid to damp out torsional oscillations of the inertia member relative to the hub. The hub has a series of inwardly directed vanes that are received in a corresponding number of slots in the internal member to define pairs of variable chambers filled with viscous liquid. Inwardly directed blind bores in each variable chamber form gas springs which interconnect the hub and inertia member to provide tuning.

Abstract: The disclosure illustrates a sealing assembly for two relatively rotatable members, such as a compressor housing and a shaft for a compressor wheel. The first has an internal cylindrical surface and the second has an external cylindrical surface with an annular groove therein. The second member is disposed and rotatable within the first member and a sealing ring is disposed in the annular groove. The sealing ring is a continuous member having no circumferential gaps and made from PTFE which has sufficient elasticity to enable the radially inner diameter of the ring to be temporarily increased. It is also capable of working at the temperatures to which the assembly is subjected in use and has a low coefficient of friction.

Abstract: A thermostatically controlled fan clutch having input and output members journalled about a fixed support shaft. A series of clutch plates are alternately connected to the input and output members. An annular piston housing and piston rotate with the input member and are pressurized to engage the clutches. A bore extends through the piston and connects with an annular groove on its contact face to control clutch engagement and assist in disengagement.

Abstract: The disclosure illustrates a turbocharger wastegate valve comprising a cylindrical chamber connected through a radial inlet to the gas stream upstream of the turbine. High pressure air is selectively directed across the inlet through a nozzle to prevent or permit flow into the chamber which is connected to a point downstream of the turbine. The pressure of the air delivered to the nozzle may be varied to proportion the gases bypassed around the turbine.

Abstract: The disclosure illustrates a viscous shear fluid fan drive comprising a driving disc received within an annular chamber of an output member. The disc and the chamber include closely spaced radially extending surfaces which transmit torque through a viscous fluid maintained between them. Pumping grooves are provided in the disc to insure rapid build up of hydrodynamic lubrication upon startup of the coupling. Cavities may be provided in the walls of the chamber to receive additional viscous fluid and extend service life of the coupling.

Abstract: The disclosure illustrates a bearing retaining plate for a rotating sleeve bearing of a turbocharger shaft. The plate has a central aperture receiving the shaft and a plurality of circular apertures merging with the central aperture to form restraining fingers having a contact area with the end of the bearing which is no greater than the contact area between its opposite end and another axial restraining device. The plate has integral projections which support a thrust bearing in spaced relationship.

Abstract: The disclosure illustrates a flow control bypass valve for a turbine housing. The valve comprises a closure member biased into engagement with a valve seat to block flow and mounted to swing out of engagement with the seat when a given turbine inlet pressure is exceeded thereby bypassing hot gas flow around the turbine. The mounting arrangement for the closure member is insensitive to build up of hot gas deposits and does not significantly increase the overall envelope of the turbine housing.

Abstract: The disclosure illustrates an oil deflector which prevents lubricating oil from passing away from a turbocharger bearing assembly used to rotatably support the turbocharger shaft. The deflector comprises back to back circular dished members having a central aperture through which the shaft extends. The dished members form an outwardly facing channel which traps oil that has passed through peripheral slots in one of the dished members. A flinger on the shaft ajdacent the central aperture throws outward any oil that has passed through.

Abstract: A valve for controlling flow of viscous fluid from a reservoir through a valve seat in a wall to a working chamber of a fluid coupling. Presence of fluid in the working chamber permits the drive to transmit torque in response to a single input variable, such as temperature. The valve comprises a valve arm pivotally mounted to the reservoir side of the wall and a closure member positioned on the working chamber side of the wall. The valve is biased to a position preventing flow except when a bimetallic temperature responsive element displaces the valve to an open position. The valve arm is shaped so that centrifugal force acting on it counteracts the centrifugal pressure force on the fluid in a direction opening the valve. The valve therefore is rendered insensitive to all variables except temperature.

Abstract: The present invention relates to a viscous shear coupling (e.g. for use as a fan drive comprising an annular driving member, usually in the form of a disc having a hub portion for mounting on a driving shaft, a driven member having an internal annular chamber receiving said annular driving member, with facial planar and circumferential surfaces of said chamber and opposing facial planar and circumferential surfaces of said driving member at least in part being in close-spaced relationship, said driven member being axially and radially located for rotation relative to said driving member, viscous coupling fluid in said chamber, and a 0.0005 to 0.0015 inch thick layer of non-metallic anti-friction material on at least those parts of said facial planar and circumferential surfaces of said annular chamber which are in close spaced relationship, thereby forming journal and thrust bearing means for the relative rotation of the driving member and the driven member.

Abstract: A rotatable assembly is provided which is adapted to be used in centrifugal compressors, expanders, or the like. The assembly includes a rotor rotatably mounted within a housing. The rotor is provided with an axially extending sleeve portion having an external annular groove and an axially extending bore terminating within the rotor. One end of a rotatably mounted shaft is accommodated within the sleeve bore. A stationary backing plate is disposed within the housing and encompasses the sleeve portion. The plate is provided with a stepped bore through which the sleeve extends. The stepped bore has a large diameter portion and a small diameter portion, the latter being located between the sleeve external groove and the end face of the sleeve. An annular seal means is disposed within the sleeve external groove and sealingly engages the large diameter portion of the plate stepped bore.