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awd driveline

jozef.bucha
Hello everyone,
 
For our project we need awd template with center differential, front and rear differential, i wanted to use awd_template from acar concept database, in help is writen:
 
Topology
The AWD driveline template consists of a two-piece prop shaft, a slip yoke, and three differentials. Transmission output torque is applied to the center differential, which splits torque to the front and rear prop shafts, and from there to the front and rear differentials. The prop shaft input part attaches to the powertrain through a revolute joint...
 
I made simple overall graphical topology of template (pdf in attachment):
 
What i do not understant how center differential is working. The mount part for connecting powertrain is connected to propshaft input -> propshaft front -> slip yoke -> propshaft rear -> rear differential. There is also joint torque which feed joint of center differential, which goes directly to input of front differential, with ratio of 1.
 
Question is how to setup 60-40 in center differential, for me it is looking now 100-100, with possiblity to change just input to front differential, with always 100 to rear differential
 
Thanks for help
 
Jozef
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  • 0
    There are two ways to do this as I have used it in the past.
     
    The easy way: Remove the center diff coupler. Add a joint torque to the front and rear driveshaft inputs from the center diff housing. Use 0.6*varval(cis_tranmision_output_torque_adams_id) and 0.4*VARVAL(cis_tranmision_output_torque_adams_id) respectively. (Could be a different name of the input communicator, but whatever goes into the existing center differential.
     
    The harder way, but likely more correct: Figure out what the overspeeding ratio is of the center diff. Add additional parts to build two gears from the center diff output to the driveshaft inputs that produces the correct speed ratio. In other words, build the model close to reality.
  • 0
    Thanks,i will try both ways.
     
    I think that topology description about this awd_template is wrong, also template with 100% torgue going to front and 100% torque going to rear would be nice but not real, this template is afaik work in that way.
     
    Also i wonder how is possible that central differential is modeled such as:
    Capture
    where output joint is type single. Afaik it has to be left or right.
  • 0
    Just for the benefit of others, because Jozef and I spoke about this elsewhere. The template topology is correct.
    1. The torque load path is only through the center diff input.
    2. The modify differential dialog box is not capable of showing the actual connections because it expects a left/right pair of joints, not two single joints. Regardless of this dbox's limitations, the actual modeling is correct.
  • 0
    Yes Greg confirmed that awd template is correct. Thanks. But i think that better will be if templates are done without special hacks, so new users are not confused.

    Jozef
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