Directly driven drive axle with a gear train comprising an axially-fixed sun pinion
A driving axle for a vehicle driven by an electric motor disposed on a driven motor shaft. Drive shafts are coupled to the motor shaft via the interposition of a reduction transmission stage and a following differential transmission. As part of the transmission stage an externally toothed sun pinion is disposed on the motor shaft, which is mounted in motor shaft bearings connected to a gearbox and absorbing radial and axial forces. A sleeve is disposed between, and supported on opposite sides against, the motor shaft bearings and sun pinion. A securing device is disposed on the free end of the motor shaft for fixing the sun pinion against the sleeve. Gears of the transmission stage mesh with the sun pinion, which together with the gears are embodied as helical gears having a force component acting in the direction of the motor shaft bearings.
1. A driving axle for a vehicle that is driven by an electric motor, comprising:
a driven motor shaft, wherein said electric motor is disposed on said motor shaft;
drive shafts coupled to said motor shaft via the interposition of a reduction transmission stage and a following differential transmission, wherein said drive shafts are intended for wheels respectively disposed thereon;
an externally toothed sun pinion that, as part of said reduction transmission stage, is disposed on said motor shaft, wherein said motor shaft is mounted in motor shaft bearings that are connected to a gearbox of said reduction transmission stage, wherein said motor shaft bearings are embodied as bearings that absorb radial and axial forces;
a sleeve that is disposed and supported between said motor shaft bearings and said sun pinion;
a securing means disposed on a free end of said motor shaft for fixing said sun pinion against said sleeve; and
gears of said reduction transmission stage that mesh with said sun pinion, wherein said sun pinion and said gears are embodied as helical gears having a force component that acts in the direction of said motor shaft bearings.
2. A driving axle according to claim 1 , wherein said sun pinion is supported directly against said sleeve.
3. A driving axle according to claim 1 , wherein a spacer disk is disposed between said sleeve and said sun pinion.
4. A driving axle according to claim 1 , wherein said securing means fixes said sun pinion against said sleeve with bias.
5. A driving axle according to claim 1 , wherein said sun pinion is disposed between said sleeve and said securing means with slight axial play.