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LEGO models my own creation MOCpages toys shop 8860 with front suspension - refined version !
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8860 with front suspension - refined version !
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My first attempt at front suspension on this car worked, but only just ! The main cause for the poor performance was the inefficient transfer of movement from the tyre to the shock absorber as the shocks were too far inboard. This "MKII" version also includes a steering wheel at a slightly more realistic angle for the imaginary driver.
About this creation
The small cog to the left of the steering pinion is simply a slave gear to keep the rack level. Note small gap between steering pinion cog and front of universal joint (a grey "5" axle is used for this shaft to allow sufficient support) - essential to prevent the joint from snagging on the rack.
The new level of the steering wheel has eliminated the strange behaviour of the universal joints that I noticed with my previous version (though I don't remember noticing it in the "official" layout of the 8860 ) in that the rate of rotation of the pinion cog relative to the steering wheel seemed to vary at different points in the rotation of the steering wheel - i.e. it wasn't always 1:1 ! Odd, presumably explicable by someone who knows everything there is to know about universal joints, but I didn't like it.



Close up of driver's side front wheel. I even found room for some front brake discs.



View from below - clearly showing greater distance between inboard and outboard trailing arms and reduced distance from tyre to shock absorber, in comparison with the first layout. This layout gives greater efficiency of transfer of movement from tyre to springs, and far more satisfactory than my earlier attempt ! Compression and rebound are about as smooth as that of the 8865; I think the chunky wheel bearings help keep the tyres plush to the surface.



Comments

 I like it 
  March 20, 2013
Awesome!!!! Very interesting front suspension setup, not like typical double wishbones. I know what you mean about the universal joints. When they are bent at too much of an angle, they work "unevenly", just like knob wheels. As a result, it feels like the ratio varies.
 I like it 
  December 8, 2012
Excellent solution! Yes, universal joints are tricky beasts. I think their 'give' or slackness can create a bit of a lag at some points and very direct rotation at other points. They also have a degree of extension and contraction, just to add some more hassle! The universal joints in my LS400's steering threw some similar problems at me. I know this must have caused you a few headaches, too. You've done well! :-)
 I like it 
  November 7, 2012
A neat solution to an age-old problem. Nice.
 
By Daniel Wareing
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LEGO models my own creation MOCpages toys shop 8860 with front suspension - refined version !


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