Patent ID: 6951269

Claim:
A changeover device ( 6 ) for selectively applying a driving torque applied to a first end of a drive shaft ( 3 ) to a selected one of a first output shaft ( 4 ) and a second output shaft ( 5 ), comprising: the first output shaft ( 4 ) and the second output shaft ( 5 ), wherein the first output shaft ( 4 ) is coaxial with and axially displaced with respect to a second end of the drive shaft ( 3 ), and the second output shaft ( 5 ) is a hollow shaft surrounding the first output shaft 4 , an electromagnetic clutch ( 7 ), including an integral cast coil ( 14 ) located in a non-rotatable annular magnet body ( 16 ) of U-shaped cross-section coaxial to the drive shaft ( 3 ), a coupling element ( 8 ) coaxial with the drive shaft ( 3 ) and axially movable with respect to the drive shaft ( 3 ) toward one of a first position toward the first end of the drive shaft ( 3 ) and a second position toward the second end of the drive shaft ( 3 ) dependent on a current supply to the cast coil ( 14 ), the coupling element ( 8 ) including an annular guide element ( 17 ) of L-shaped cross-section connected to the coupling element ( 8 ) enclosing and rotatably and axially movable with respect to the annular magnet body ( 16 ), an annular power transmission element ( 18 ) connected to and axially and rotatably movable with the annular guide element ( 17 ) and including inwardly circumferential engagement toothing ( 19 ), and a resilient element ( 10 ) coaxially and non-rotatably mounted to a hollow cylindrical part ( 11 ) surrounding and non-rotatably connected with the second end of the drive shaft ( 3 ) to bias the annular guide element ( 17 ) axially along the drive shaft ( 3 ) toward one of the first position and the second position, wherein the hollow cylindrical part ( 11 ) encloses the second end of the drive shaft 3 with the first output shaft 4 rotatably supported in an axial hollow ( 12 ) of the hollow cylindrical part 11 by an anti-friction bearing 13 , thereby centering the drive shaft ( 3 ), the hollow cylindrical part ( 11 ) and the first output shaft ( 4 ) on a common axis, and wherein the second output shaft ( 5 ) includes radially extending spline teeth engaging with the toothing ( 19 ) of the power transmission element ( 18 ) to transmit torque from the drive shaft ( 3 ) to the second output shaft ( 5 ) when the annular guide element ( 17 ) is axially displaced toward the first position and disengaging from the toothing ( 18 ) when the annular guide is axially displaced toward the second position, and the first output shaft ( 4 ) includes an annular friction flange ( 20 ) engaging with the power transmission element ( 18 ) to transmit torque from the drive shaft ( 3 ) to the first output shaft ( 4 ) when the annular guide element ( 17 ) is axially displaced toward the second position and disengaging when the annular guide element ( 17 ) is displaced toward the first position.