Quinn Law Group, PLLC
Electrically variable transmission with an axially-moveable selectable one-way clutch assembly
An electrically variable transmission (EVT) includes two shafts and a selectable one-way clutch (SOWC) having a first and second ring. The SOWC selectively connects the shafts, and is applied by moving the first ring and a blocking device in an axial direction into frictional contact with the second ring. A hydraulic piston applies the SOWC and a return spring releases it. The SOWC freewheels in both directions, or holds torque in one or both directions, depending on how the blocking device is rotated. A method for reducing losses in an EVT includes axially moving a second ring and blocking device of a SOWC into contact with a first ring, rotating the blocking device using frictional contact with the first ring, locking rotation of the first ring to apply the SOWC, and moving the second ring and blocking device an axial distance from the first ring to release the SOWC.
GM Global Technology Operations LLC
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Alan G.
Holmes