Suspension & Steering Geometry (Front) | Double Wishbone | Anti-Ackerman | SAE BAJA | Solidworks

In this video tutorial, i have shown how to make Front Suspension and Steering geometry of a 4 wheeler. Here, I have taken an All terrain Vehicle(ATV) suspension and steering system for reference, but same approach can be applied while designing for Standard cars and other vehicles. Only the parameters will change according to the type and dynamics of the vehicle.
Suspension type- Double Wishbone
Steering geometry type- Anti-ackerman
Link to download the model:- grabcad.com/library/suspensio...
Basic Parameters used :-
1. Wheelbase= 55 inches
2. Trackwidth= 52 inch (Front and Rear same)
3.Front Ground clearance= 15 inches
4. Rear Ground clearance= 14 inches
5. KPI angle= 7°
6. Castor angle= 12°
7. Knuckle length= 6 inches
8. Spindle length= 120 mm
9. Spindle length (for wheel nut)= 75 mm
10. Steering Arm length= 80 mm
11. Steering Arm angle with spindle= 110°
12. Tyre Outer Diameter= 23 inches
Please note that these parameters are used just for educating and learning purpose. Concrete calculations and certain other important factors related to Vehicle dynamics and Handling along with suspension analysis are considered and performed before designing any suspension and steering system of any vehicle.
But these values are close to the standard industry values. I also used them in various college level projects. So they can be used as reference values.
If you found the video informative, please Hit the Like button, Comment any doubts/issues related to the content in the video and Please share among your friends and colleagues.
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[@obypanda]

Oh man ! thank you, you're my hero 😊

[@ASquareCD]

Glad it helped! Thank you for watching

[@jagsproduction]

Well explained sir, such videos are rare♥️

[@ASquareCD]

NOTE- Hello all. I have by mistake entered the value of Caster angle as 112 degrees in smart dimension, despite mentioning it as 12 degrees. It should be 102 (90+12) degrees in the smart dimension. Thank you, everyone. Do let me know if any of your doubts come.

[@SahilSingh-im4iz]

Hey, man great work. I have a doubt that how do we find out the hardpoints for upper and lower arms mounting on the chassis since I wanted to enter it into lotus. And if you have any references like sites, pdfs etc on how to locate those points can you please link it here. It would be extremely helpful if you make a video on it.

[@ASquareCD]

It's so simple. Click on the point where the A arm pivots on the chassis member. Click on that point and note x y z coordinate. Though I will make a short video for it.

[@ASquareCD]

Hi Sahil, I have now uploaded the video on how to extract the hardpoints from a suspension geometry made in Solidworks and also how to import those extracted hardpoints in Lotus software. Check out my 2 latest videos. I have made them in 2 parts.

[@erhankalaman2430]

Hello! Firstly thanks for the video. I could not see that you have given dimension for the camber angle. Is it possible to give camber with only this sketch ?

[@ASquareCD]

You can assume the dimension. If you are asking for knuckle length, then take 5 inches. Otherwise there is no need to give dimensions to reference lines.

[@krishnas525]

sir how can i contact you

[@baranimuruganantham337]

Hey man !!!! In this video on what basis are you placing that rack there???

[@ASquareCD]

In this suspension, I have taken the steering geometry as Anti-ackerman. So on basis of that when you view from top view, steering rack will come ahead of the line joining the both front wheel centers. And also I placed at a height so that we have space for creating mounting for it and I left clearance for the roll cage Fram pipes.

[@utkarshgupta6578]

Hello ! I am creating a new rollcage for baja and wants to create suspension geometry ! Could plz tell me how to start calculation and all that ??!

[@ASquareCD]

You can start the calculations for deciding outer diameter and thickness of rollcage pipe. You have adhere to the minimum requirement asked in the Baja rulebook. Then after that you can create custom template as per given outer diameter and thickness and assign as per the rulebook.

[@daveeeeeed9201]

Is the track-width you entered the distance from the middle of the tire to the other middle of the tire or the outside of the tire to the outside of the other tire?

[@ASquareCD]

Yes. Middle to Middle of both tyres.

[@daveeeeeed9201]

@@ASquareCD Wow ! you are so fast to reply! thank you so much!

[@ASquareCD]

@@daveeeeeed9201 Yes, I try to get back asap to all the doubts and questions and I am glad I was able to solve your query. Thanks for watching the video.

[@mithun_mandyleo]

can u upload REEV(range extended electrical vehicle ) form SAE suspension Geometry video pls...

[@ASquareCD]

Okay, Will definitely make it.

[@arnabadhikary828]

So the next step to this is extracting hardpoints from this model and refining in LOTUS and Adams ,right ? I am a beginner.

[@ASquareCD]

Yes. You see every line has 2 points in SolidWorks. And those points have x y z coordinates. Just note down coordinates of points like, Upper ball joint Lower ball joint Wheel centre Spindle end. Upper arm front pivot and rear pivot Lower arm front pivot and rear pivot Damper Upper point and lower point. Note all of them and then transfer to Lotus. Note- you need to adapt with the axis system of Lotus analyzer with SolidWorks.

[@arnabadhikary828]

@@ASquareCD yes sir, I will try it out. Thank you.

[@ASquareCD]

@@arnabadhikary828 thank you for watching. 👍

[@ASquareCD]

Hi Arnab, I have now uploaded the video on how to extract the hardpoints from a suspension geometry made in Solidworks and also how to import those extracted hardpoints in Lotus software. Check out my 2 latest videos. I have made them in 2 parts.

[@arnabadhikary828]

@@ASquareCD okay sir , thanks a lot. Will definitely check them out .

[@AbdulBasit-hm4mq]

How did you find the length of tie rod in 3D and also rack position?

[@ASquareCD]

Basically, here I have shown how to create the architecture or say 3d wireframe of a suspension/steering geometry. I have not shown the calculation part of any parameter. It is just the designing. Now, to calculate length of tie rod, you need to analyze the steering rack length and it's height + steering arm angle + steering arm length in some suspension software like LOTUS. Also, turning radius and Ackerman/ anti-ackerman percentage is also considered while evaluating tie rod length. So, that can be done as a separate video.

[@AbdulBasit-hm4mq]

@@ASquareCD can you make a video on those calculations?? I would really appreciate it

[@ASquareCD]

@@AbdulBasit-hm4mq okay. I have noted it. I will work on that video and try to publish soon.

[@AbdulBasit-hm4mq]

@@ASquareCD Thank you!

[@arnabadhikary828]

Hello sir, Sir how to get these points from Sw to Lotus. Part 1 of C of G Part 2 of C of G Part 3 of C of G Part 4 of C of G They ask these points in Lotus . Do you have any idea?

[@ASquareCD]

You can leave those values as they are. They dont affect your analysis. I can understand you are relating it with CG, but we can define CG height and CG position by defining the weight distribution at the front and rear axles. So dont worry about them.

[@arnabadhikary828]

Thank you sir.

[@sugavaneshwarang2570]

How to determine the rool center and motion ratio?

[@ASquareCD]

For Roll center, you need to create instantaneous center's for both front and rear suspension and from there roll center can be determined. I am bringing up the video for rear suspension geometry soon, after that I can make a video for that. For Motion ratio, you need to know your suspension travel and wheel travel. the formula is suspension travel divided by wheel travel. It can be determined from geometry as well. I will put up a video for that as well.

[@sugavaneshwarang2570]

@@ASquareCD thanks bro

[@sreetam8533]

I think you took caster angle 22 deg instead of 12 deg

[@ASquareCD]

Yes. You told it correctly. I just saw it. I mentioned the Caster angle at 12 degrees but ended up putting the value 112 degrees in the smart dimension. It's a mistake. It should be 102 degrees. Thanks for watching the video with this much attention. I would never have known about it.

[@mithun_mandyleo]

can u upload REEV(range extended electrical vehicle ) form SAE suspension Geometry video pls...

[@ASquareCD]

Can you share an image or something at [e-mail] so that I can have a proper look.

[@mithun_mandyleo]

@@ASquareCD sure