Innovations
Storage of Traction Batteries in Ladder Frames
Ladder frames have relatively low torsional stiffness.
Traction batteries attached to the ladder frame can be damaged by the torsion.
The SGF battery mount prevents any influence of ladder frame torsion on the battery.
In addition, the elastic mounting protects the battery from excessive track excitation.
Functionality:
The points centered on the respective section of the ladder frame always form a common plane, even if the ladder frame twists. The 4 bearings are positioned on these points.
When additional bearings are used, they are connected with a compensating mechanism that raises or lowers the additional bearings.
Flexible Discs for the Side Shaft
The advantages of flexible discs, such as low mechanical losses, are not only evident when they are used in the longitudinal shaft, but also when they are used in the side shafts.
Depending on the application and field of use, conventional flexible discs can be used or also new designs such as arrangement of the loop packs in star form or structure as a double flexible disc.
In addition to the classic arrangement of the units, motor(s) and gearbox, flexible discs are also ideally suited in combination with wheel hub gearboxes, both spur gearboxes and planetary gearboxes. Due to the lower torques in the sideshafts, both the sideshafts themselves and the flexible discs can be designed to be more filigree.
Functionality:
A flexible disc does not work by means of a displacement of balls or rollers, as a metallic sideshaft joint does, but is based on an elastic deformation of the flexible disc, i.e. the fiber and rubber material. Since there is no need for grease filling, the flexible disc is not only maintenance-free over its entire service life, but also results in lower losses, especially at low operating torques.
Lateral Shaft with Reduced Losses
Novel arrangement of the sideshafts of a vehicle with significantly smaller deflection angles than conventional arrangement with internally located joints.
Shown here as an example of two designs in which the increased length of the sideshaft is clearly visible. The type of joint used in each case is a flex coupling, but other joint types are also possible.Â
Functionality:
A reduction of the deflection angle in the joints and thus a reduction of the mechanical losses is achieved by an extended sideshaft, which uses the additional overall length of the wheel hub and/or the drive.Â
Can also be combined with wheel hub gearboxes (with or without balancer coupling).
Flexible Joint Coupling for Wheel Hub Transmission
Wheel hub gears offer several advantages, in particular they allow lighter sideshafts due to the lower torque at the gear input. In addition, it is possible to position the sideshaft off-center to the wheel, which offers further advantages, for example the drive shaft can be guided past the wheel spring.
A flexible disc between the wheel hub and the wheel transmission keeps deformations harmful to the wheel transmission, resulting for example from the finite stiffness of the wheel bearings, out of the transmission.
Functionality:
Deformations of the wheel bearing, for example when cornering, are harmful to the gear teeth inside the transmission. To avoid this, a compensating element decouples the wheel hub from the transmission input or output.
Can also be combined with side shaft with lower losses.
Elastic Joint for High Bending Angles
In many applications, torsionally elastic joints with good damping properties are required. Joint discs are suitable for these purposes due to their excellent mechanical decoupling behavior. However, joint discs reach their limits at high bending angles.
For applications with large bending angles, the newly developed joint type is suitable, which combines the previous positive properties of the joint disc with a low restoring torque under bending load.
Functionality:
Unfavorable load cases of the winding packages, which cause forced elongation under bending angles, are significantly reduced by the clever combination with bearings. The remaining deformation is sufficiently small to be compensated by the elastic winding packages.
This combination also makes it possible to increase the power density, which not only increases the maximum possible bending angle but also positively affects the reduction of the outer diameter. Thus, very high torques can be transmitted in the smallest installation space.
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