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Third Leg


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Trailers have a third wheel and people forget to winch it up so it brakes. Heavy trailer users have even broken 2-3 of them. D&E team created a third wheel system that can be installed to the existing Tiki trailers. Team created a mechanism that prevents driving when the third wheel is lowered and guarantees that the third wheel is always risen from the ground before driving.

Team: Janno Nõu, Tarko Koger, Aleksei Olenik, Max Böhme
Company: Bestnet

Published in: Business, Technology
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Third Leg

  1. 1. third leg spring semester 2012
  2. 2. introductionBackgroundBestnet AS is modern towing trailer manufacturer. It is so popular, that evenword „trailer“ in estonian is often pronounced as „tiki-trailer“. Bestnet isalso one of the biggest exporter of Estonia, with yearly turnover in exess of15 million euros. The main market is Scnadinavian countries and the brandsare called TIKI and AKU. Tiki-trailer focuses on continuous development ofquality and production technology.Aim of the projectThe aim of this project is to develop a smart trailer. Smart trailer is atrailer that has higher self-awarness than current plain metallic structures.Following points give a brief overview of points which to consider: - Smart trailer, that is able to register overload due to exessive weight,bad weight distribution, wrong driving manners etc. - Integrating electronics to raise the trailer self-awareness. - Integrating smart structures that react on abnormal function of trailer. - The aerodynamics to reduce the fuel consumption. - The weight reduction to reduce the fuel consumption. - Unification of used materials to reduce the manufacturing costs.Team Tarko Koger Aleksei Oleinik Janno Nõu Max Böhme MA D&E MA D&E MA D&E BA Industrial Design first year first year first year fourth yearTutors Henrik Herranen Sven Sõrmus Tallinn University of Estonian Academy Technology of Arts
  3. 3. contents introduction contents car trailerRESEARCH working method visit of Tiki user interviews interviews with leasing services opinions from internet blogs market situation Tikis range of products competitors in comparance trailer attributes users specific used trailer analysis of the web-presentationANALYSIS trailer problems progress second meeting with Tiki ritual of boot-trailers usage ritual vs. roboticCONCEPT direction for ideas idea generation idea selection and evaluation concept preparation concept selectionDESIGN mechanical inspirations concept modelling coupling connection adaption to the real trailer advanced concept-models final design developed design calculation for the spring risk analysis static-load-stress analysis trigger development prototyping sources design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  4. 4. research car-trailerA general overviewFor many transportation issues, trailer are the first choice. Be it, thatpeople cannot afford a big transporter, or that they don‘t need it every day,in relation to the price of a big car allows a trailer more specialized use.Besides this are some goods or objects simple to big for cars, like boots forexample.Indeed, using and driving of a trailer needs experience, especcially forbigger trailers and so people need the special application BE for theirdriver-licence. That this is not a guarantee for a diligent use is totally clear,everybody is oblivious in a way. ? [some examples how not to transport something]
  5. 5. So trailer manufacturer nowadays are producing more and more specialtrailer for the special issues. That less mistakes will happen and that the useof working become more practical and give mor independence to the people.There existing one the one side solutions trough extra equipment and onthe other side customized trailers with adapted dimensions, characteristicsand implemented equipment. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  6. 6. research working methodOur goalDue to the fact, that the bigger part of the team didn‘t worked deeperin the trailer-business before, we started with a broad research. Also itwas important to find some special solution for Tiki, which gives themthe possibility to set apart from their competitors and reach a uniqueselling pont. Our final development of one product means in this way ofthinking not the only possible way. In analysis of the current state and thecircumstances, our discussion and concept-generating about the future oftrailers in general, became the second leg in this project.What we did at the end, is only a first step in this proposed direction.Our way current Pictures situation, analyse of tiki pile of brainstorming information Competition Needs of users/ analyse/pictures owners, from our interviews Requirements ideas for the trailer Ideas Comparing / WINNER Ideation Breef and clear understanding, what, where ,for whom ect.We collected a bunch of informations and analyse them, for setting thedifferent importances. Then we made concepts of the trailers close, medium teisipäev, 28. veebruar 12and far future, for which we created respective ideas and concepts. Theseare presented in this report. For the most realistic issue, which is also inthe frame of time, costs, producing possibility and without competitivealternatives we finally made a range of solutions. In decision of thecircumstances we selected one idea, worked out the design and brought itto a prototyp.
  7. 7. visit of Tiki7.02 Our first visit to the companyTiki presented their company in general: structure, facilities, manufacturing,machinery, warehousing, logistics. During our consultation companyrepresentatives said that they do not want to restrict our flights of thoughtsbut contrary during our process, more and more restrictions and “thingsneeded to be considered” continuesly appeared themselves while developingbecause realistic outcome – prototype – was expected at the end of thecourse. Our team also only sees point and value generating concepts thatare feasible. Therefore production and development possibilities needed tobe clarified. That was definitely essential to set further frames because thisprobably wouldn’t be some futuristic concept but more realistic one thatmight even end up prototyping. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  8. 8. research user interviews Never sure if the load an the hook The empty trailer is still ok; you can is dancing on the only gauge. highway! When I drive my vehicle on the tilted trailer, he I have no feeling seems to brake. for the trailer when The third wheel taking a turn. makes often problems while driving. When I don‘t need the trailer I store it in the garage. I check the weight To drive back is of the load while difficult; the back looking how broad of the trailer is out the tires are. of view. It‘s all about experience. It lasts so long to winch the third wheel up again. I expect that the trailer is usable everywhere like my Lada-Niva.For our first interviews we asked private users with more and less experience.Of course the problems are different from person to person, but somepoints appeared again and again.
  9. 9. interviews with leasing services the customers don‘t care about sometimes people the trailer, cause want to have a it‘s not their own trailer but don‘t have a hook the taillights are often broken while driven backwards plastic covers are against sth. people rarely read more aerodynamik the manual the cover is too the leasers heavy for women don‘t know the parameters for loading we prefer Respo cause of the better the leasers forgot supply, when we to wind up the have to repair third wheel somethingFor our interviews of trailer-leasing we went to some building marketsin Tallinn, which offer a less or more good service, to some Gas-stationsin Pärnu, whose want to earn extra cash and so only use the most easytrailers of less than 750kg (no special permissions neccessary) and at leastto the bigger rental service in Pärnu. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  10. 10. research opinions from internet blogs TIKI RESPO Pros Cons Pros Cons lights were lack of INNER more quality do not complain connected in a hooks in standard made wrong way equipment new TIKIs handle does not handle tendency to float cheaper overloading better overloading underload hits suspension to the falls apart (8 years feels massive and heavy end experienced both) LOADED good capacity/ higher trailer surface - TRALER: side overloading tighter in width higher lifting surface swinging carrier small ground problems with stronger sides  clearance brakes suspension does LOADED more fixing hooks on  not strike if some TRALER: vertical standard package extra kg-s swinging due to low ground tolerates lightness (3m - clearance -  overcapacity/overloading 220 kg) frequent harvesting issues with stronger frame - brakes but 2 better looking  rec new RESPO times less than TIKI more reliable    (used both) cheaper    exploitation better assembly, integration if parts    needed to be exchanged RESPO user TIKI user feedback Used both or just commentator feedbackThe users also make recommendations• Go for better offer (8 years experiencced both)• With brakes• new respo (stronger frame)• respo because of handling overcapacity• 4 wheels: TIKI - 1 shaft balanssiiridega; RESPO - 2 separate shafts• IT‘S ALL ABOUT MAINTAINER
  11. 11. market situationdesign & engineering | TTÜ & EKA Tallinn | springsemester 2012
  12. 12. beach trailersspecial offer 700€standard trailers boot trailers products research Tikis range ofprofessionel trailers professionel boot trailersprofessionel trailers with brakes and division car trailers tractor trailersclosed trailers cable trailers
  13. 13. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  14. 14. research competitors in comparanceBy checking the range of products from competitors, some small differenceswere found. It‘s at least not only about the products, which vary less, butalso more about the way of presenting, which gives a different accentuationon the trailers.So we compared the prices related to the different trailers, marked somespecialized parts and took looks into the presentation/way of providing (seeanalysis of Tikis homepage).Other than Tiki or Respo, the P+P trailer center is a trading firm insteadof a producer. They are selling trailers which are mostly manufactured inGermany or the Netherlands. The range of products is wide and so it givesan insight into the german trailer business. TIKI TRAILERS prize in € load in kg types size in cm prize in € load in kg types size in cm Trailer at the P+P Trailercentersmile T. 700 629 1 265x122 <750kg 500-1235 520-580 19 202x114 300x150 <1400kg 1045-2000 780-1080 21 210x110standard T. 710-970 443-612 4 200x122 300x150 275x138 <2000kg 1325-2745 1100-1620 13 250x125 300x150profi T. 900-1630 387-579 9 350x148 <2600kg 1790-3470 2100-2190 7 300x150 252x123 400x185profi with break T. 2010-4220 968-1682 9 299x148 RESPO TRAILERS prize in € max. weight in kg types size in cm 382x209 standard 525-1770 750kg 17 1.50x1.20 3.50x2.06boot T. 800-1000 369-635 4 standard with brakes 2066-2396 1500kg 5 3.00x1.50 3.50x1.80profi boot T. 1110-4830 582-2001 7 double axes 1422-1760 750 8 3.00x1.50 3.50x1.80 double axes with brakes 2294-3035 1700-2700 9 3.00x1.50strand T. 630-1000 484-1043 3 4.00x1.50 boat trailers 466-1345 700-750 11 3.80x1.79car T. 3350-3800 1430-2010 4 418x196 5.80x2.09 boat trailers with brakes 1533-3811 900-3500 11 5.80x2.09 489x194 8.10x2.41closed T. 3740 , 4530 386 , 935 2 346x144 car trailers 2493-4664 2000-3500 6 4.00x1.82 4.90x2.05 flatbed trailers 2428-4388 1700-2700 4 3.06x1.68cable T. 3720 , 4360 1071 , 2187 2 5.50x2.20 van trailers 2190-5515 750-2000 9 3.00x1.50tractor T. 3140-4180 2301-3023 3 3.50x1.75Differences in the range of products from P+P - no boat trailers and less speciallised order of trailers - cheapeast offering for a standard trailer (but it‘s a small one) - trailers use not only metal, for example also plywood for thesideboards - sale most times already with the third wheel - accentuation on the „service-friendly“ bolting, so less welded trailers - 10 years of guarantee (Koch-Trailers) - differentiation through the weight of the load and applied covering
  15. 15. Differences in the range of products from Respo- more use of bolted trailers- well organized homepage (see later in analysis of Tikis homepage)- more specialized trailers and better range of products - boat trailers much cheaper than from Tiki- biggest possible choice of standard trailerthe inconsiderable diffence in the look: design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  16. 16. researchtrailer attributes process of coupling overweight braking to car issues foldable pole weight positioning openingpossibility TRAILER empty driving fixing of the load weather proofed tiltingpossibility upgrade weak possibility the third anti-theft wheel wheel devices arches power- cables to reliability the car long life materials normal functions abnormal functions
  17. 17. users specific used trailerLOW OPERATING EXPERIENCEleasers manifold load [ just need something for transportation ]private owners boots [ prefer normally the cheapest trailer ] animalscommercial vehicles [ ] prefer the trailer with the longest lifeHIGH OPERATING EXPERIENCE design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  18. 18. analysis analysis of the web-presentationTo find more reasons for Tikis current market situation, we also examinedtheir homepage in comparance to other trailer-companys. The main problemwe get out of this, is that Tiki don‘t determine a special orientation oftheir qualities. That way the users and customers don‘t know about thespecial characteristics, which in our opinion could be a accentuation on longlife. Some small failure in the web-presentation let the homepage of Tikistanding back behind the one of Respo. Again the inconciderable differencein the look:We took also looks into other webpages of german trailer companies, to getmore different design-solutions.
  19. 19. first look - at the startpage for the countrys no picture of a trailer - looks like Respo (colours) - no mark on a special characteristic of TIKIshop - categories only with words --> less clearness what it is - no possibility for a comparance of trailer on the first look (like Respo) --> non-direct connection between trailer and the information about - totaly no pictures for the extra-stuffextra informations - in „Why Tiki“, Products and Contact no pictures - „Why Tiki“ implicate other companys for trailers - in „About Company“ bad graphic-design (non-professional) - no helping information for the customer, which trailer is the best for himorientation - differentiation with countrys or languages? - three clicks to the final product is OK (sometimes only 1 click), but the way is hard to find design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  20. 20. analysis trailer problemsFrom the research with users of normal and also boot trailers, we listed themost common problems and handicaps in use. The choice contains largelythe points, which could be intersting in the view of deign and engineering. sidesboards sharp edge become instable which rip without the clothes backboard third wheel isa forgotten in the down lights brake position overlad easy while overload on issue backdriving the coupling hook
  21. 21. water get into only help forthe lights, but alight the bootnot out again out of the water, not for alighting balancing of the boat even third wheel with help quite falls down difficult while drivingtends to rust no places to stand during the procedure braking not adjustable electronic in height connections design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  22. 22. analysis progressOn a gigantic map we collected all our previous informations. Some ofthe original issues seemed to be quite ridiculous in consideration of thefeasibility Tiki could offer. We tried to find a logical direction from Tikisrecent position to our design.Finally we chose some issues to working on, which we presented to Tiki: weight measuring stronger on coupling connection wheel plug weight measuring failsafe third equipment wheel
  23. 23. second meeting with Tiki15.03Second meeting with Bestnet AS.We made brief presentation and discussed over the following topics:• Trailer in general• Tiki’s product portfolio• Tiki products in comparison with competitors• Market and competitor analyses• Customer survey: from users aspect• Resellers/distributors feedback: problems with usersAdditionally we introduced and proposed several initial possible solutionsfor improvements to the main problems. Our main goal was to fix thedevelopment direction among standard, professional or boat trailers.Bestnet’s interest was to go towards boat trailers.In our discussion afterwards we decided to elaborat more on a researchfor the boot-trailer, but we allready said, that many problems of the boot-trailer not so much different from normal ones. That for we would also goon with finding solutions for most of the common trailer problems. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  24. 24. analysis the ritual use of a boot trailerFrom a for many years experienced user of boat trailers we get the exactlyorder what you have to do, when using a boat trailer:• Technical service, check• Visual check• Holistically in one piece• Safe to drive• Condition of tires and pressure in it• Connecting trailer to a car – „click“ sound• Control lifting for coupling hook connection• Safety cable mounting• Socket connecting• Car ignition• Lights check• Turn signals• Break lights• Side (gauge) lights• Reverse lights• Lifting up the third wheel: if doesn’t fix -> remove entirely• Delivering trailer from storage place to yachtport where loading takes place: meanwhile as well as default short distance control ride• Trailer unlinking from car: for later balancing• Trailer position fixing with chocks and handbreak• Loading• Yacht is lifted with crane• Edges are tied with rops for more exact positioning and directing the yacht• Fixing the load with fastening belts and elastic rope hooks• Positioning the softeners in between possibly might frictioning surfaces• The equipment is prepacked before loading in order to avoid dust, dirt and possible damages from hitting tarmac from the road • If loading is fixed – physical check for fasteners via shaking and wiggling• Reversing car as near as possible to coupling hook: for most it’s difficult (even I have had slight touch between coupling hook and rear spoiler)• Appling handbreak for car• Connecting trailer with car• Loading distribution check: if nessecary – adjustment• Visual check and evaluation from sides as well as from back view• Tire pressure control: if need for adaption – stop in gas station• Visual check via mirrors when starting to drive• While fueling or stops – visual check and physical control for fastenings
  25. 25. ritual vs. robotAllready in the research we mentioned, that a lot of the problems likebroken third wheel or broken lights, but also a bad weight distributionor an overloading are caused by careless users. These problems are notmore important, when the users have a lot of experience. Of course alsofor the well experienced owner of a trailer would these kind of systems likean electrical weight-measuring practical. The question arised, how manytechnological affort how much benefit for the users would bring. users neccessary experience expert use (ritual) use with least risk use with more risk full robotic trailer technical solutions design solutionsAs the two extreme points we set a super experienced user and on theother side a fully automatical trailer, which act nearly like a robot. Bothextremes are not desirable, cause of the costs for the robotic-trailer orbecause of the mistakes which can happen till a user is well experienced.So the aim is, to find smart technical solutions or designs, how user canplay the ritual in an easier way without mistakes. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  26. 26. concept direction for ideasFrom the already collected problems, we choose four which seemed to fitin our claims for smartness, benefit for the users and feasability for Tiki. needs time no information while using if the load iss to much and right balanced weight fall down distribution while driving dangerous problems while driving will brake when it is third wheel forgotten brake while backdriving get wet and short the whole electric lights and system electrical system oblivious user (ritual of use) easy to forget to plug or to unplug
  27. 27. idea generationWe collected some ideas, how it would be possible to solve the problems: design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  28. 28. concept idea selection and evaluationLong discussions in the team, with Henrik and the teachers brought us theproblem, that on the one side super-technical-advanced solutions would beinnovative and able to solve the problems, on the other side these solutionsare not possible today. Tiki wanted to give us a free field for exploration,but also we wanted to make something realizable.So we decided to kick out the problem of the weight distribution: To solvethis problem you have to change the complete system of the couplingpart, what is not possible in the context of our project, or you canimplement some simple extra systems. Latter already exist how we foundout; special scales you can use on the coupling hook of the car or which areimplemented in the third wheel:For other problems also exist some smart additive solutions:
  29. 29. The residual solutions we checked out with an evaluation matrix: design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  30. 30. concept concept preprarationThe idea evaluation didn‘t identified a clear way; again it was a contradictionbetween too simple and too difficult solutions. So we made a secondevalution with the aim, to find realisable work in the context of our projectand to be also able to say, what would be the next step on the path ofdeveloping the super-smart trailer.After all we distributed the ideas into three concepts, to show what wouldbe possible in the future, but what doesn‘t fit into the recent schedule.NOW FEW YEARS FUTURE no budget some budget unlimited budget simple add-ons some basical changes high-technical improved low-tech intelligent ritual helper robot
  31. 31. NOW simple metal no budget structures simple add-ons pretend the easy ligths from change with braking plugconnections improved ritual more hooks for fasten the belts and the plane third wheel gets a secondary adjustment short checklist system of the ritual at the couplingThe use of the trailer like a ritual means actually, that you will not forgetthe actions you have to do nowadays. All solutions have a cheap realisationand don‘t change the system, only add something. For task like the weight-measuring should be used already available add-ons. (see idea-selection) design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  32. 32. concept FEW YEARS some budget completely some basical changeswaterproofed &brake-secured lights scale for load low-tech possibility to balancing winch the boot into the water helper third wheel cannot be forgotten ability to adjust the height failsafe and easier use of the third wheel plug has remind-bell against being forgottenThe use of the trailer like a helper means, that all systems should becomemore reliable and with more adjustment possibilities. Also is the trailer ableto mention, when for example the the user forgot top connect the lights.Then a noise would sound. Systems like measuring tools could be partlyimplented, but could be also still exist as add-ons.
  33. 33. FUTURE unlimited budget digital load high-technical measuring for automatic balancing pushing and pulling of the intelligent boot robot automatically decoupling and power- connection black-box control system with wireless connection to automatical the user adjusting rollers automaticalle uprising third voice-control, wheel connection to the car & smartphone applicationThe trailer like a robot would be able to achieve a lot of actions by his own.Controlled by a central black-box, the user can command via his voice or asmartphone screen. There it is also possible to check the conditions of theload and if problems appear you will get autonomous information. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  34. 34. concept concept selectionAdequacy for the projectFrom all single solutions in the three possible concepts we finally decidedin the team to work on the issue of the third wheel. It shall be possibleto create an design, which can Tiki produce by its own without investing inspecial equiptment or capacities. Also the mechanical part seemed to becomplex enough, when it should work mechanical automatically.Following the NOW-concept for a promtly realisation, the aim is find asolution with fits in the most already existing trailer.Benefit for the UserIn the research become clear, that the third wheel is a point which has oftenproblems. These are more important than, for example the lights system,which is only needed for communication in traffic. When you lose the thirdwheel, than that will have other bad consequencies. (see red graph) Withinversion of the problems to their reasons, we can say what the third wheelshould be able to do. (green graph)
  35. 35. recently problematic you have to remove it while driving the wheel lose time can fall down not possible to while driving discouple the trailer when it‘s loaded the third wheel brakes cannot use the trailer (only super- the user can light load) forget to rise the wheel lose money you have to buy a new oneconceptional third wheel save money wheel cannot be forgotten save time wheel cannot fall down design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  36. 36. designmechanicalinspirations
  37. 37. design modellingWith a bound of sketches we started to approach the design and found out,that for the 3rd-wheel-system are mostly three parts neccessary:1. the way the third wheel is able to rise2. how it will be locked in both positions3. how we can connect the system to the coupling1. the way the third wheel is able to riseFor uprising exist two posibilities: The wheel can strictly lift up or it canturn arround an pivotable point. Latter would have to advantage, thatthere is less friction to be mentioned. For both solutions it has to find away, how giving the power to the system. The system should also work,when there is no electrical power from the car, so in mechanical thinkingsprings are most capable. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  38. 38. designa straight uplifting system with locker and pulling springs X
  39. 39. some pivotable systems(pivotbale point inside/outside the main profile; rotable plate instead ofaxis; different solutions for the fixing point) design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  40. 40. designFinally we decided for a torsion spring in a pivotable system. Thenthere is no long way (for lifting up the third wheel) like a normal spring hadalso need and this torsion spring would take the least space for working.A common use of them you can find in automatic knifes, which have alreadyan intersting locking system.One problem of the spring was the length (or broad) of the spiral: Thiswould mean, that the third wheel have to be placed more far away fromthe main profile and could become so instable. Or it has te be place beneaththe spring, which also brings quite similar problems.
  41. 41. 2. How it will lockAgain with the pivotable spring system we had to decide, if we want to useone turning point or better a turning plate. The plate would have much morestability and distribute the tension of the wheel, but would also generatemuch more friction. Together with the fact, that for the locking system aretwo fix-points better (even the third wheel would stay up, because of thespring), we choose the pivotable plate. So the locker, or trigger how wecalled it, can have to fixpoints in the plate.It should be made out of one material to don‘t use to much parts andassembling time. The flexibility can be created with cutting long holes intothe material, which drops the resistibility of the solid material. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  42. 42. design coupling connection3. how we can connect the system to the couplingFor an intelligent connection to the coupling-system, we evaluated whenthe locking system need and can get which input-information from thecoupling: connected process third wheel coupled locker to couple trailer alone down no locked yes coupling up yes unlocked working before discoupling down yes workable noIt showed, that the couple-connection (the system which will unlock thethird wheel when you couple the trailer to the car) is only allowed to workwhen the car is uncoupled and the third wheel is fixed. If it would also workwhen the car is coupled, then you cannot push the third wheel down bydiscoupling; the locker wouldnt work.
  43. 43. 3rd wheel down + car uncoupled The locker (right orange part) hold the 3rd wheel (left orange part) in tension; the couple-connection (blue) is pulled back by a spring (blue) coupling The couple-connection pulls(0) the locker 0 out of the tab location(1) and the pulling1 2 end (red cross) slides upwards in the x hole(2) of the backplate (green). The 3rd wheel already try to turn.(3) 3 coupling + uprising wheel The trailers coupling is nearly closed and the 3rd wheel turn 90° in the hoizontal 4 position. The pulling end is so high in the hole(4), that it nearly gives the locker free again. coupled + uprised/ The puller is at the end; his spring want to pull him back, but the coupling of the 5 car is holding him. The puller gets free and flip back because of the own flexibility.(5) It‘s possible to push the 3rd wheel down again, even though the car is coupled. uncoupling By uncoupling the car, the spring bring the puller back in the original position. If the trailer loaded, the third wheel has to be pushed down at first. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  44. 44. design adaption to the real trailerExamination if the trailer-partFor a better and constant development we removed the front part of thetrailer Tiki had given to us. In the coupling system we checked at the part,which is moving by connecting the trailer to the car. The bolt is able to pullstrongly over a distance of 2 cm. Also we took the right measurments ofthe recent adjustment of the third wheel.The moving part in thecoupling system. The reddot-line marks the way anddistance it pass.
  45. 45. advanced concept-modelsIn this idea the spring works also around a tube, which is holding additionallethe pivotable part and is holded by itself through a sheet-metal-shroud.This shroud would be able to stop the third wheel at the lowest point andhas directly the connections to the base at the trailers frame.Here a turnable plate, holded in a ring between two other plates is holdinga tube for spring and the third wheel with two long screws. The holdingplates are connected with screws and also with screws fixed to the base ofthe trailer profile. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  46. 46. design final conceptProblems of the design with the movable plate had been, that it has to bereally big when it should fit together with the recent holding part of thethird wheel. The tubes with the special cut should be not necessary, whileusing the original holding part. The three layers for holding the pivotablepart, also a lot of scews and in this way assembling time is required.By an inversion of the holding frame to the inside and using the most of theparts in a opposite way, we finally found an easier design with less parts: base on the trailer profil base-plate movable part wheel-adjustment trigger holding plate tube The adjustment for the 3rd wheel is combined with the movable part and holding the tube. The base on the trailer profil is combined with the base-plate and the holding-plate; they are fix and hold the other sid of the tube. The completely movable part is stabilized by pressing against the edge of the holding-plate and against the end of the tube (which leads on the base) in the other direction. The spring is attached to the movable part und in a hole in the fixed holding-plate.
  47. 47. - movable parts (orange)- fixed parts (blue)- tube (light grey)- screws (dark grey)- spring (red) design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  48. 48. designdeveloped design
  49. 49. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  50. 50. design calculationfor the spring
  51. 51. risk analysisdesign & engineering | TTÜ & EKA Tallinn | springsemester 2012
  52. 52. design static-load-stress analysisTo check if the indeed robust planed design seems to be able for competingwith the reality, we made a digital static-load-stress analysis. It showed that all expectations on the material should be fulfilled.                              
  53. 53. trigger development To find the best working trigger, we had checked also a few different shapes of the material-spring-mechanism.            stress      final version  displacement      design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  54. 54. design prototypingWith the help of Tiki we started a prototype-production, to check out thefunction in real. For this we had to divide the movable part into two pieces,which later become welded together. Together with the spring and thescrews, which were supposed to be standard-parts, we assemblied all inTUT for the testing and the final presentation. 52,5 52,5 80   11 11  40 167 161 22 R3 28 R6 155 Materjali paksus 3mm Designed by Checked by Approved by Date Date admin 24.05.2012 Edition Sheet 1/1 A 35 20 55 R3,5 85 0 R2 R3,5 130 20° 167 5 3, 109 130  R5 R90 7 ,6 58 3 ,5 R5 80 1 4,  31 A(1:1) 16 124° Materjali paksus 3 mm 5,5 Materjali paksus 3 mm Materjali paksus 2 mm Designed by Checked by Approved by Date Date Designed by Checked by Approved by Date Date Designed by Checked by Approved by Date Date admin 24.05.2012 admin 24.05.2012 admin 23.05.2012 puller Edition Sheet Edition Sheet Edition Sheet 1/1 1/1 kogus 2 1/1 admin Designed by Sisemine diameeter vastavalt võimalustele vahemikus 30...36 mm Oluline välisdiameeter 40 mm. Checked by 36 Approved by 32 40 tube Date 23.05.2012 Date Edition 1/1 Sheet
  55. 55. With the exception of the trigger, Tiki made all parts quite well. But whiletesting the prototype, Alex and Tarko found out: some parts needs littlechanges of 0.1 - 2.0 millimetre in the design, to work fluently. Also thespring has to have exactly the right power. design & engineering | TTÜ & EKA Tallinn | springsemester 2012
  56. 56. scources Analysis for Electronic Equipment (3rd Edition)Steinberg, Dave S. © 2000 John Wiley & SonsMotor Vehicle Structures: Concepts and Fundamentals, Jason C. Brown, A. John Robertson, Stan T.Serpento, Butterworth-Heinemann 2002Sclater & Chironis - Mechanisms And Mechanical Devices Sourcebook 3rd ed [McGraw-Hil 2001]Marks‘ Standard Handbook For Mechanical Engineers_Mcgraw Hill (1996)(1519s), 10th.EdMachinery‘s Handbook 26Th Edition (Complete Despite The Size)
  57. 57. design & engineering | TTÜ & EKA Tallinn | springsemester 2012