Open top menu
28 April 2012


Pit Stops have always been important in F1, less time spent in the box usually means less traffic on exit (if the strategy guys have done their job well) and could mean jumping an opponent in the stop. With Ferrari leading the pit stop game at less than 3 seconds for a stop this year it has become crucial to make faster and faster stops.

Ferrari & Mercedes have adopted a 'Nut in Wheel' solution which means the nut floats within the rim itself. This saves time for the tyre removers/fitters and gun man as there is physically one less job to do. However when things go wrong the system can be catastrophic. If the wheel isn't aligned correctly when fitted and the nut cross threads you can't simply remove the nut and place on the spare (Teams without the 'nut in wheel' solution have a spare to hand) This was the reason for Mercedes/Schumacher's retirement in China. If however the car hadn't left the box they would have needed to change all 4 wheels as you can't simply bolt on 1 wheel from another tyre allocation.
Ferrari have also gone down the route of less threads on the shaft, meaning less rotations of the nut. From the picture comparison below you can see that on the left Ferrari have 3 turns on the shaft with much wider spacings in comparison to McLaren (on the right) with 5 much narrower threads.


The Ferrari system is further helped by large retracting pins in the end of the shaft. These pins are spring loaded so when they push the wheel or gun on the pins push into the shaft. 

They work like so:

Step 1 - Place wheel over the shaft, as the wheel goes over the shaft the pins retract into the shaft, once the wheel is on the pins snap back.
Step 2 - With the pins in the out position the wheel is aligned to the thread and cross threading becomes impossible (Unless a retracting pin fails)
Step 3 - Wheel Gun man places the gun on which isn't impeded by the retracting pins as they only reach the outer edge of the wheel nut race.
Step 4 - Quicker stop due to less time on the gun with less threads to turn





McLaren have had problems at the left rear of the car firstly with Jenson in China and twice more with Lewis's car in Bahrain. Having the problem on the same side on 3 occasions I feel cannot simply be an error by the pit crew and must be some kind of flaw in the McLaren system. I have previously speculated about heat being an issue and still believe this could be plausible.  Especially if we consider that as the heated aluminum nut is taken off remnants of that nut could be left behind on the threads making placing a new nut on the threads difficult.  If we ignore heat and take Ferrari's system as the benchmark (as it's the fastest) we can see that McLaren also have the retracting pins in their shaft, however these pins are much smaller and offer no concrete method of holding the wheel in place whilst the nut is attached as the nut will also push over the pins allowing the wheel to unseat.

All Original Images Copyright f1zoom.co.cc
Tagged
Different Themes
Written by Matthew 'SomersF1' Somerfield

Formula One is a sport that pushes technological boundaries, with the pace of the changes to the cars as swift as the laptimes. This blog looks to keep you upto speed with these alterations.

17 comments:

  1. djfraser@engineer.com28 April 2012 20:20

    Just some thoughts: the smoother form of Ferrari's large pitch threads are unlikely to cross-thread (unless damaged). Mclaren's threads are too fine. The large lead (gives more linear movement / rev) of the Ferrari thread ensures the wheel will engage quicker with hub location spigots giving stability when fitting the wheel. The Ferrari retracting pin clearly works providing (as you have said) excellent alignment between wheel nut and stub axle. The amount float of the nut in it's housing will be small but with a big eye on thermal expansion. The inner faces of the pins are not flat but are close to being perpendicular to the stub shaft giving swift wheel nut location whilst allowing the pins to retract promptly when being undone. It is a click-on and torque up system. Some may argue that the pins may slow down wheel detachment if the nut becomes loose. My jury is out on this. The McLaren mini retracting splines will keep the wheel nut concentric with the stub axle with the wheel being engaged with the hub location spigots. The thread form is the core weakness here. David Fraser.

    ReplyDelete
  2. Thanks for the response David, I agree.

    ReplyDelete
  3. Do you have to pay to use Sutton images?

    ReplyDelete
  4. Good job Matt!

    ReplyDelete
  5. Images are taken from F1zoom (as credited) but are originally from Sutton i'd imagine.

    ReplyDelete
  6. Yes they are sutton images, F1zoom just downloaded them and rehosted (illegally I imagine). I think you should at least credit Sutton before they contact you about using them.

    ReplyDelete
    Replies
    1. They would have to purchase them from Sutton to have them in that resolution ;) Anyways in future I'll credit Sutton too as it's their work.

      Delete
    2. You don't have to purchase them to do that but ok.

      Delete
  7. The post is talking about in car wheels. Useful post.



    steel wheels & locking casters

    ReplyDelete
  8. I am looking few tips off car accessories & got some useful tips from this post.Thanks for sharing for car wheels.

    industrial tire & caster wheel manufacturers

    ReplyDelete
  9. Please advise - I attended the Shell V- Power Nitro + Festival at Nasrec this past weekend and saw the following which no one there could give me an answer for. There was a area in the display tent where we as public could have a go at changing the wheel on a dummy car set up. The thing I could not understand is the one wheel used a right hand thread to fasten whereas the other wheel used a left hand thread. On asking I was told that this is how it is on the actual cars that Ferrari run but they could not say why. Is it true and on which wheels does this happen front or rear?

    ReplyDelete
    Replies
    1. I have only just seen this more than three months after it was posted.
      Using left and right hand threads on opposite sides of the car has been around for probably 80 years or more on centre lock wheels.
      The idea is that the revolution of the wheel will cause the nut to self tighten.
      If both sides of the car used the same direction of thread then one side would naturally self tighten whilst the other would try to loosen as the car was driven.

      Delete
  10. I love reading through your blog, I wanted to leave a little comment to support you and wish you a good continuation. Wish you best of luck for all your best efforts.


    Heavy Duty Caster Wheel & Locking Casters

    ReplyDelete
  11. Nice article. I think it is useful and unique article. I love this kind
    of article and this kind of blog. I have enjoyed it very much. Thanks
    for your website.
    TLR Carbon wheels

    ReplyDelete
  12. Craig Willows-Keetley shares the story of his journey to compete in the
    half Ironman length Challenge event in Phuket. Craig shares his training
    program , details of the race and lessons he learnt from the event.
    Hear his story about the Challenge event that’s a Challenge and a half!.
    Carbon bike wheels

    ReplyDelete
  13. Problem: HP Printer not connecting to my laptop.

    I had an issue while connecting my 2 year old HP printer to my brother's laptop that I had borrowed for starting my own business. I used a quick google search to fix the problem but that did not help me.
    I then decided to get professional help to solve my problem. After having received many quotations from various companies, i decided to go ahead with Online Tech Repair (www.onlinetechrepairs.com).
    Reasons I chose them over the others:
    1) They were extremely friendly and patient with me during my initial discussions and responded promptly to my request.
    2) Their prices were extremely reasonable.
    3) They were ready and willing to walk me through the entire process step by step and were on call with me till i got it fixed.
    How did they do it
    1) They first asked me to state my problem clearly and asked me a few questions. This was done to detect any physical connectivity issues with the printer.
    2) After having answered this, they confirmed that the printer and the laptop were functioning correctly.
    3) They then, asked me if they could access my laptop remotely to troubleshoot the problem and fix it. I agreed.
    4) One of the tech support executives accessed my laptop and started troubleshooting.
    5) I sat back and watched as the tech support executive was navigating my laptop to spot the issue. The issue was fixed.
    6) I was told that it was due to an older version of the driver that had been installed.

    My Experience
    I loved the entire friendly conversation that took place with them. They understood my needs clearly and acted upon the solution immediately. Being a technical noob, i sometimes find it difficult to communicate with tech support teams. It was a very different experience with the guys at Online Tech Repairs. You can check out their website www.onlinetechrepairs.com or call them on 1-914-613-3786.
    Would definitely recommend this service to anyone who needs help fixing their computers.
    Thanks a ton guys. Great Job....!!

    ReplyDelete
  14. VIRUS REMOVAL

    Is Your Computer Sluggish or Plagued With a Virus? – If So you Need Online Tech Repairs
    As a leader in online computer repair, Online Tech Repairs Inc has the experience to deliver professional system optimization and virus removal.Headquartered in Great Neck, New York our certified technicians have been providing online computer repair and virus removal for customers around the world since 2004.
    Our three step system is easy to use; and provides you a safe, unobtrusive, and cost effective alternative to your computer service needs. By using state-of-the-art technology our computer experts can diagnose, and repair your computer system through the internet, no matter where you are.
    Our technician will guide you through the installation of Online Tech Repair Inc secure software. This software allows your dedicated computer expert to see and operate your computer just as if he was in the room with you. That means you don't have to unplug everything and bring it to our shop, or have a stranger tramping through your home.
    From our remote location the Online Tech Repairs.com expert can handle any computer issue you want addressed, like:
    • - System Optimization
    • - How it works Software Installations or Upgrades
    • - How it works Virus Removal
    • - How it works Home Network Set-ups
    Just to name a few.
    If you are unsure of what the problem may be, that is okay. We can run a complete diagnostic on your system and fix the problems we encounter. When we are done our software is removed; leaving you with a safe, secure and properly functioning system. The whole process usually takes less than an hour. You probably couldn't even get your computer to your local repair shop that fast!
    Call us now for a FREE COMPUTER DIAGONISTIC using DISCOUNT CODE (otr214426@gmail.com) on +1-914-613-3786 or chat with us on www.onlinetechrepairs.com.



    ReplyDelete

Total Pageviews