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LEGO models my own creation MOCpages toys shop Car Ambulance Part II
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Car Ambulance Part II
A few weeks ago I shared already a few pictures. Now the truck is ready.
About this creation

A few weeks ago I presented a teaser now I have the car ambulance ready. Several weeks ago I saw a car ambulance with some classic cars. This gave me the idea to create this car. Besides that I wanted to use the "Unimog" wheels to try a big size car.
This was a challenge! Building a big car in itself is not difficult, getting it stable and sturdy is another story. It took me some rounds to get the chassis stable enough to make it able to carry itself.




This stabalizing forced me to investigate what triangle options are possible with Lego technic. Like in math you have this famous 3x4x5 triangle. Unfortunately Lego does not adhere to these theories with regards to distance in holes in the beams. The ones I used mostly are; 7x9x11, 4x5x6 and 6x14x15. Besides those I first created a traditional 'column' from front to back 5 x 7 for almost the full length of the car.

Functions I had in mind were:


  • Steering with Ackermann

  • Rear drive

  • Front and rear drive with suspension and fixed axles

  • 8 cylinder engine

  • Radiator

  • Winch to pull the cars on the ambulance

  • Tilting flatbed for easy pulling car on ambulance

  • Motorized tilt and winch

  • Door locks

  • Car stabalizers

  • Front of car as an American Stile long haul cabin and front




Now I had the main chassis ready. Next I designed the front and rear axle. The rear axle is pretty straight forward. I used the part 92908 introduced in the Unimog to increase free space below the car easily. It is a fixed axle so you can easily apply suspension and with the tilt of the fixed axle you can manage the height of the car. With the stabalizer you keep the axle in the middle of the car during driving.





Based on the width of the rear axle the front axle was build. This was a bit more difficult because I had to keep in mind to apply "Ackermann" tech. This took me a while. Finally I decided to build the whole structure myself and not using the part 92908 for the front axle. Due to the weigth of the car steering is a bit heavy. Because of the size of the car the steering and the wheel are wide apart causing some torsion in the axles used. All-in-all the steering is successful.




Next the back part. The flatbed is pretty large and was bending a lot. I didn't want to have it more than 2 rows of beams thick. After a few rounds of designs it was sturdy enough. first thing was the tilt mechanisme with the Linear Actuator 61927c01. Initially I had them pointing to the back and lifting the flatbed on a point half way. This was not working because with cargo the flatbed again started to bend. I changed it to raise the flatbed from the front. Now the tilting worked fine.





In order to get the classic cars on this ambulance I designed a winch. This was not very complex. I used the slip wheels actually on both functions and to switch power beteen I used the gear change function. BUT what was holding me back was the weight of the classic cars!! My winch couldn't pull the weight! I created already so much torque that you really had to be patient, because it takes a while to get the car fully 'winched' up the flatbed. However after a night sleep it struck me; apply a pulley.




However pullies you have in all kind of sorts. I needed to have one with as minimum as possible loose parts because a pulley in lego technic is quite bulky. What I came up with was a pulley fixed to the flatbed and one fixed to the hook. This did the trick now with the pulley the winch managed to pull the car on the ambulance easily.


Below you find some detail pictures for the following:


  • Tilting and winch mechanism

  • Front and rear axle

  • Door lock

  • Yellow stabalizers

  • Drive Line

  • Battery holder

  • Pulley







Finally below the reason why I started this project for in the first place. Transportation of my Lego Technic classic car 8860!




This is really a good looking combination! Plus now I have this project finished I can finally start with my 42030 Volvo Front Loader!! And think about a model with 8 big wheels.





Comments

 I made it 
  August 27, 2014
Quoting LUKE TATE Nice car-transporter/roll back(flat-bed) tow truck! This truck is heavily detailed and function1l. Plus it is recognizable as an American heavy duty truck with great styling! Can you please give me instructions to at least build the chassis?
Hi thanks for stopping by. Unfortunately I didn't make detailed pictures of the chassis or building steps. However if you start with a 'beam' 5 wide 7 height, then for the length you are good. Additionally some triangles to cover stability for the width. By doing you will come to same result.
 I like it 
  August 27, 2014
Nice car-transporter/roll back(flat-bed) tow truck! This truck is heavily detailed and function1l. Plus it is recognizable as an American heavy duty truck with great styling! Can you please give me instructions to at least build the chassis?
 I like it 
  August 16, 2014
8860 looks as great as ever.... this is superb transport for it. Enjoy the Volvo - it's an excellent model, but you'll make something better with it!
 
By Rabbitdesign MB
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LEGO models my own creation MOCpages toys shop Car Ambulance Part II


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