Three speed electric vehicle transmission

A multi-speed transmission, comprising:

• an input shaft coupled to a first electric motor and a second electric motor via a first gear train;
• a synchronizer shaft selectively coupled to the input shaft via one of a second gear train and a third gear train depending on a selected gear ratio;
• an idler shaft selectively coupled to the synchronizer shaft via one of a fourth gear train and the fifth gear train depending on the selected gear ratio;
• and
• an output shaft coupled to the idler shaft via a sixth gear train in one of a short drop configuration and a long drop configuration, wherein a multi-range clutch, including a first clutch and a second clutch, is positioned on the input shaft and a synchronizer is positioned on the synchronizer shaft;
• wherein in a first selected gear ratio the synchronizer is in a neutral position, the first clutch is disengaged, and the second clutch is engaged such that power flows from a second clutch gear to a synchronizer shaft gear that is arranged on the synchronizer shaft, from the synchronizer shaft gear to an idler shaft gear that is arranged on the idler shaft, and from the idler shaft gear to the output gear that is arranged on the output shaft;
• and
• wherein in a second selected gear ratio the synchronizer is engaged with the fourth gear train, the first clutch is engaged with the first gear train, and the second clutch is neutral such that power flows from the input shaft to the first clutch, from the first clutch to the synchronizer shaft, from the synchronizer shaft to the synchronizer, and from the synchronizer to the idler shaft.

An electric drive unit, comprising:

• a transmission system comprising:
• an input shaft;
• a synchronizer shaft;
• an idler shaft;
• a first clutch arranged on the input shaft and configured to selectively couple the input shaft to the synchronizer shaft in one or more of first and third gear ratios;
• a second clutch arranged on the input shaft and configured to selectively couple the input shaft to the idler shaft in a second gear ratio;
• a synchronizer configured to selectively couple the synchronizer shaft to the idler shaft in one of the first and third gear ratios based on a position of the synchronizer when the first clutch is engaged;
• and
• an output shaft coupled to the idler shaft, wherein the output shaft is positioned in one of a first and second position relative to the input shaft;
• and
• one or more electric motors, wherein each of the one or more electric motors is coupled to the input shaft of the transmission system;
• wherein in a first selected gear ratio the synchronizer is in a neutral position, the first clutch is disengaged, and the second clutch is engaged such that power flows from a second clutch gear to a synchronizer shaft gear that is arranged on the synchronizer shaft, from the synchronizer shaft gear to an idler shaft gear that is arranged on the idler shaft, and from the idler shaft gear to the output gear that is arranged on the output shaft;
• wherein in a second selected gear ratio the synchronizer is engaged with the fourth gear train, the first clutch is engaged with the first gear train, and the second clutch is neutral such that power flows from the input shaft to the first clutch, from the first clutch to the synchronizer shaft, from the synchronizer shaft to the synchronizer, and from the synchronizer to the idler shaft;
• and
• wherein in a third selected gear ratio the synchronizer is engaged with the fifth gear train, the first clutch is disengaged, and the second clutch is engaged with the second gear train such that power flows from the input shaft to the second clutch, from the second clutch to the synchronizer shaft, from the synchronizer shaft to the synchronizer, and from the synchronizer to the idler shaft.