The shear pillar suspension is an independent front suspension for lightweight cars. The axle of the stub and the wheel assemblies are attached to vertical pillars or kingpins that glide up and down through bushes or shrubs attached to the vehicle chassis, usually as part of a transversal outrigger assembly, sometimes resembling traditional beam shafts, albeit rigid. to the chassis. Steering motions are provided by allowing these same sliding pillars to rotate.
The independent suspension of shear pillar was first used by Decauville in 1898, the first example of independent independent suspension recorded on motor vehicles. In this system, the axle of the stub that carries the wheel has been mounted to the bottom of the pillar which slid up and down through the bush in a transverse shaft mounted in front of the chassis. The top of the pillar is fixed and spinning on a semi-elliptical leaf spring across. This system was copied by Sizaire-Naudin a few years later.
Around 1904, New Jersey inventor J. Walter Christie introduced a sliding shear suspension system with vertical coil springs, which might be an inspiration for later use by Lancia on its Lambda from around 1922. Lancia continued by shifting the pillar suspension until the 1950s, an. Appia. In turn, this was copied for a year by Nash on his 600th unibody model.
The shear pillar suspension system has also been used by several cyclecar manufacturers, Tracta makers in France, and several prototype vehicles.
In 1909 H.F.S. Morgan introduced a fundamentally similar system using axle shear stubs on fixed pillars, used first on Morgan Motor Company cyclecars, then on their cars to date. The Morgan design is a reversed shear pillar, much like most later designs; the pillars are attached to the chassis and the stub axle is carried by the sliding arm above this.
The weakness of the shear pillar system is that the track changes with differential suspension motions, such as when one wheel rises above the obstacle (as can be seen in the diagram above). This is particularly a problem where the track is narrow (like for cyclecars) in relation to the travel suspension. The effective path is the AC or AD hypotenuse of the triangle ABC, where AB is the fixed pillar distance. However, many types of suspensions, such as the swing axle have similar problems. Track variations are usually considered less important than wheel camber changes, which are virtually absent in sliding pillar systems (see suspension geometry).
This suspension system is rare, but is used primarily in the breaking Lancia Aurelia coupa (1950-58).
Video Sliding pillar suspension
See also
- Plunger suspension - The same shear suspension, used for the rear suspension of some motorcycles.
Maps Sliding pillar suspension
References
Source of the article : Wikipedia
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