Electromagnetic shifting device comprising a linear motor

An electromagnetic shifting device for a transmission (1) with an electronic control unit (22) and toothed gear wheels (6, 7), which are rotatably supported on a transmission shaft (2) for rotation about an axis (3), the toothed gear wheels (6, 7) forming a gear stage when rotationally fixed to the transmission shaft (2) by axial movement of a shifter pawl (4) along the axis (3), the shifter pawl (4) being moved axially along the axis (3) by a linear motor (12) comprising a primary portion (14) and a secondary portion (13), one of the primary and the secondary portions (13, 14) of the linear motor (12) being arranged in the transmission shaft (2) and another of the primary and the secondary portions (14, 13) of the linear motor (12) being arranged in the shifter pawl (4).

A method for controlling an electromagnetic shifting device for a transmission (1) with an electronic control unit (22), the method comprising the step of:

• producing electrical energy for a control unit (15) of a linear motor (12) by a generator unit (20) which converts mechanical energy of a transmission shaft (2) into the electrical energy.

An electromagnetic shifting device for a transmission (1) with an electronic control unit (22) and first and second toothed gear wheels (6, 7), which are rotatably supported by and axially fixed on a hollow transmission shaft (2), the shifting device comprising:

• a shifter pawl (4) being rotationally fixed on the hollow transmission shaft (2), the shifter pawl (4) being axially slidable between a first position and a second position, in the first position, exterior teeth (5) of the shifter pawl (4) engage with inner teeth (8) of the first toothed gear wheel (6) such that the first toothed gear wheel (6) is rotationally fixed on the hollow transmission shaft (2), in the second position, the exterior teeth (5) of the shifter pawl (4) engage with inner teeth (9) of the second toothed gear wheel (7) such that the second toothed gear wheel (7) is rotationally fixed on the hollow transmission shaft (2);
• a linear motor (12) having a primary portion (14) and a secondary portion (13), the primary portion (14) of the linear motor (12) being located within the hollow transmission shaft (2) and the secondary portion (13) of the linear motor (12) being located in the shifter pawl (4), the primary and the secondary portions (14, 13) communicate to axially bias the shifter pawl (4) along the hollow transmission shaft (2) between the first and the second positions.