Here I have tried to construct from Technic Lego an analogue of the front suspension system of a vehicle using top-steer MacPherson suspension.
About this creation
This type of front suspension uses only one wishbone. I tried to use a grey shock absorber but even with massive bracing the play was too great when a wheel was added. Whilst a long motorcycle shock absorber solves that problem, it means that the upper shock mounting is very high, so this type of arrangement is probably only good for very large models.
The steering arms operate on the top of the shock absorber which rotates with the front wheel hub when steered, in a similar arrangement to a Vauxhall Cavalier I used to have. The steering arms are however only located in front of the axle in my arrangement because of the demo frame used. Also my Cavalier was front wheel drive, which would not be possible in the arrangement shown here.
There is potential for impresive steering lock with this arrangement due to the requirement for bracing arms between wishbones being dispensed with.
An alternative version with two shock absorbers, you won't see many actual MacPherson struts using two shocks per wheel.
I've been playing with this idea for the last week or so, and have developed this form of suspension to the point where I think i finally have something strong enough and compact enough to incorporate into a complete model car, so hope to post a whole new MOC to feature this mechanism soon.