Electromagnetic shifting device comprising a linear motor
AssigneeZF Friedrichshafen AG
InventorBernd Müller
Life of this patent
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Abstract
An electromagnetic shifting device for a transmission (1) with an electronic control unit (22) and toothed gear wheels (6, 7), which are mounted to rotate on a transmission shaft (2) about an axis (3). To implement a gear stage, the toothed gear wheels can be connected in a rotationally fixed manner to the transmission shaft by moving a shifter pawl (4) axially along the axis. The shifter pawl is moved axially along the axis by a linear motor (12).
Claims15
An electromagnetic shifting device for a transmission (1) comprising:
- an electronic control unit (22) and first and second toothed gear wheels (6, 7), which are rotatably supported on a vehicle transmission shaft (2) for rotation about an axis (3), the first and second 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) of the transmission shaft (2), each of the first and second toothed gear wheels (6, 7) having radially inwardly facing teeth (8), the shifter pawl (4) having mating radially outwardly facing teeth (5) and being rotationally fixedly supported on the transmission shaft (2) and being axially movable along the axis (3) of the transmission shaft (2) by an electric 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 electric linear motor (12) being arranged within the transmission shaft (2) and the other of the primary and the secondary portions (14, 13) of the electric linear motor (12) being arranged in the shifter pawl, wherein the first and the second toothed gear wheels are both rotatably supported by and axially fixed on the transmission shaft, one of the primary portion and the secondary portion of the electric linear motor is a positionally fixed component, and the positionally fixed component is located within the transmission shaft (4).
A method for controlling an electromagnetic shifting device for a transmission (1) comprising 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 an electric 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 electric linear motor (12) being arranged in the transmission shaft (2) and another of the primary and the secondary portions (14, 13) of the electric linear motor (12) being arranged in the shifter pawl (4), the method comprising the step of:
- producing electrical energy for a control unit (15) of the electric linear motor (12) by a generator unit (20) which converts mechanical energy of the 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, radially outwardly facing teeth (5) of the shifter pawl (4) engage with mating radially inwardly facing teeth (8) of the first toothed gear wheel (6) so that the first toothed gear wheel (6) is rotationally fixed on the hollow transmission shaft (2), in the second position, the radially outwardly facing teeth (5) of the shifter pawl (4) engage with mating radially inwardly facing teeth (9) of the second toothed gear wheel (7) so that the second toothed gear wheel (7) is rotationally fixed on the hollow transmission shaft (2);
- an electric linear motor (12) having a primary portion (14) and a secondary portion (13), the primary portion (14) of the electric linear motor (12) being a positionally fixed component located within the hollow transmission shaft (2) and the secondary portion (13) of the electric linear motor (12) being located in the shifter pawl (4), and
- the primary and the secondary portions (14, 13) communicate with one another for axially biassing the shifter pawl (4) along the hollow transmission shaft (2) between the first and the second positions.
Dependencies are inferred from the claim text.