Holset Engineering Company, Limited

Peter Stuart McKean

Brian E Walsham

David T Szczupak

David Michael Moulson

Desmond J Hooley

David Flaxington

John D Wescott

A variable geometry turbine in which a turbine wheel is mounted to rotate about a pre-determined axis within a housing. A sidewall is displaceable relative to the housing to control the width of a gas flow passage defined adjacent the wheel between the first surface defined by the sidewall and the second surface defined by the housing. The sidewall is mounted in the sidewall cavity within the housing on axially displaceable rods extending parallel to the rotation axis of the wheel. A yoke is pivotally supported within the housing and defines arms each of which extends into engagement with a respective sidewall support rod. The yoke is pivoted relative to the housing to control the position of the sidewall relative to the housing. The yoke is located within a yoke chamber defined by the housing, and lubricant is delivered to the yoke chamber to lubricate both the bearing upon which the yoke is pivotally mounted in the housing and surfaces which interengage the yoke and the sidewall support rods. The yoke chamber is spaced from sealed against communication with the sidewall cavity.

Variable geometry turbine

A mounting assembly for a movable annular wall member of an inlet passageway of a variable geometry turbine. The inlet passageway is defined between the movable wall and a facing wall. The wall member is formed from a sheet material and is supported on a plurality of pins which extend parallel to the direction of movement of the wall member. The wall member comprises a tubular portion extending away from the facing wall and each pin supports a radial extending projection having a pair of spaced tabs. Each tab is engaged in a respective slot in the tubular portion of the wall member, the tabs being a relatively close fit in the direction of movement of the wall member and a relatively loose fit in a plane at right angles to the direction of movement.

Variable geometry turbine inlet wall mounting assembly

An actuator assembly for a variable geometry turbine in which an inlet passageway to the turbine is defined between a movable annular wall member and a facing wall, the position of the movable annular wall member being adjustable to control the width of the inlet passageway. The annular wall member is supported on a pair of pins which extend parallel to and are slidable parallel to the axis of the rotation of the turbine wheel. Each pin is engaged by a respective arm of a pivotally mounted stirrup the angular position of which is controlled by an actuator. The engagement between the pins and the stirrup is such that pivotal movement of the stirrup causes axial movement of the pin.

Variable geometry turbine actuator assembly

A mounting assembly for a movable annular wall member of an inlet passageway of a variable geometry turbine. The inlet passageway is defined between the movable wall and a facing wall. The wall member is formed from a sheet material and is supported on a plurality of pins which extend parallel to the direction of movement of the wall member. The wall member comprises a tubular portion extending away from the facing wall and each pin supports a radial extending link. Each link is engaged in a respective slot in the tubular portion of the wall member, the links being a relatively close fit in the direction of movement of the wall member and a relatively loose fit in the circumferential direction.

A turbocharger for a diesel engine 34, wherein combustion air is supplied under pressure to the engine's intake manifold 32 from a centrifugal compressor 20 rotated by a turbine wheel 18 driven by exhaust gas from the engine supplied to inlet volute 44. Exhaust gas from the volute impinges on the turbine wheel after passing between stationary vanes 60 in an annular inlet passage between thin wall 52 and wall 46 of turbine housing 40. In this passage is a thin wall annular flange 64 slotted to fit over the vanes. The flange is part of a thin wall ring 62 stamped from stainless steel movable across the passage to control the inlet area thereof. The ring 62 is movable by actuators 80 (only one shown) having rods 74 connected to the ring. Springs 116 act on the rods 74 to urge the flange 64 towards the wall 46 thus reducing the area of the inlet passage so exhaust gas rushes through the reduced inlet and speeds the turbine and compressor providing at manifold 32 an increased air pressure. This increased pressure is used to urge diaphragm 100 in the actuators 80 in opposition to the springs and thus move ring 62 to increase the inlet passage area. The thinness of the ring 62 minimizes the chance that exhaust products will make it stick to vanes 46 and enables the ring to move quickly in response to actuators 80. Also the ring is cheap to make.

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Huddersfield, United Kingdom

Peter Stuart McKean