Exhaust gas recirculation valve assembly

An exhaust gas recirculation valve assembly comprising:

• a valve housing having a flow housing portion defining a flow passage extending therethrough and along a flow axis, a gear assembly housing portion coupled to the flow housing portion, and a shaft bore extending between the flow passage and the gear assembly housing portion;
• a driven shaft positioned in the shaft bore and extending along a shaft axis generally transverse to the flow axis;
• a shaft bearing disposed in the shaft bore and pivotably supporting the driven shaft;
• a butterfly member coupled to the driven shaft for pivoting movement with the driven shaft about the shaft axis, the butterfly member being pivotable between a closed position, in which flow of gas through the flow passage is inhibited, and an open position;
• an electronics housing coupled to the valve housing;
• a printed circuit board supported in the electronics housing;
• a drive pinion extending between the electronics housing and the gear assembly housing portion, the drive pinion being drivingly coupled to the driven shaft;
• and
• a sealing assembly to inhibit flow of gas from the flow passage into the electronics housing, the sealing assembly including
• a first seal positioned in the shaft bore and along the driven shaft to provide a seal between the driven shaft and the shaft bore, the first seal being disposed between the flow passage and the shaft bearing,
• a second seal positioned in the shaft bore and along the driven shaft to provide a seal between the driven shaft and the shaft bore, the second seal being disposed between the shaft bearing and the electronics housing,
• a plate engaged between the valve housing and the electronics housing, the plate defining an opening therethrough, the drive pinion extending through the opening into the gear assembly housing portion, and
• a sealed bearing supported by the plate and pivotably supporting the drive pinion in the opening, the sealed bearing providing a seal between the drive pinion and the plate.