The Knowledge about Double wishbone suspension systems（2）
The trailing arm system is literally that - a shaped suspension arm is joined at the front to the chassis, allowing the rear to swing up and down. Pairs of these become twin-trailing-arm systems and work on exactly the same principle as the double wishbones in the systems described above.
The trailing arm system is literally that - a shaped suspension arm is joined at the front to the chassis, allowing the rear to swing up and down. Pairs of these become twin-trailing-arm systems and work on exactly the same principle as the double wishbones in the systems described above. The difference is that instead of the arms sticking out from the side of the chassis, they travel back parallel to it. This is an older system not used so much any more because of the space it takes up, but it doesn't suffer from the side-to-side scrubbing problem of double wishbone systems. If you want to know what I mean, find a VW beetle and stick your head in the front wheel arch - that's a double-trailing-arm suspension setup. Simple.
Twin I-Beam suspension
Used almost exclusively by Ford F-series trucks, twin I-beam suspension was introduced in 1965. This little oddity is a combination of trailing arm suspension and solid beam axle suspension. Only in this case the beam is split in two and mounted offset from the centre of the chassis, one section for each side of the suspension. The trailing arms are actually (technically) leading arms and the steering gear is mounted in front of the suspension setup. Ford claim this makes for a heavy-duty independent front suspension setup capable of handling the loads associated with their trucks. In an empty truck, however, going over a bump with twin I-beam suspension is like falling down stairs in leg irons.
Moulton rubber suspension
This suspension system is based on the
compression of a solid mass of rubber - red in both these images. The two types
are essentially derivatives of the same design. It is named after Dr. Alex
Moulton - one of the original design team on the Mini, and the engineer who
designed its suspension system in 1959. This system is known by a few different
names including cone and trumpet suspension (due to the shape of the rubber
bung shown in the right hand picture). The rear suspension system on the
original Mini also used Moulton's rubber suspension system, but laid out horizontally
rather than vertically, to save space again. The Mini was originally intended
to have Moulton's fluid-filled Hydrolastic suspension, but that remained on the
drawing board for a few more years. Eventually, Hydrolastic was developed into
Hydragas (see later on this page), and revised versions were adopted on the
Mini Metro and the current MGF-sportscar.
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