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The two arms, the spindle, and the body, form a four-bar link.Use of the linkage at the lower suspension connection of either a MacPherson strut or a short long arms suspension readily gives an effective virtual ball joint outboard of the spindle, which is very useful for a suspension designer, allowing negative scrub radius whilst allowing the ball joints to move in and thus out of the way of ...
Another variant of the MacPherson strut is the double pivot front suspension, which splits the lower wishbone into two while retaining the standard upright design of the MacPherson strut. That allows for better control of steering geometry and scrub radius, while allowing for a larger brake assembly.
Double wishbone suspension (front) on a Saab Quantum IV. The double-wishbone suspension can also be referred to as "double A-arms", though the arms themselves can be A-shaped or L-shaped. A single wishbone or A-arm can also be used in various other suspension types, such as variations of the MacPherson strut.
In either case, the difference is that the single bottom wishbone is replaced by a pair of suspension links forming a trapezoidal four-bar linkage. This allows the kingpin to pivot about a pivot point nearer the center of the wheel's contact patch instead of the traditional pivot point at the ball joint of the bottom wishbone. [2]
You shouldn't dismiss MacPherson struts, which are on more top cars than you'd think. Nearly all Porsche 911s, every BMW M3, the list goes on...
The type of suspension (MacPherson strut or double wishbone suspension) Type of steering actuator (rack and pinion or recirculating ball) Location of the steering actuator in front of, or behind, the wheel centre; For the rear suspension there are many more possible suspension types, in practice.
The kingpin offset compares favorably to that of double wishbone suspensions (20-30mm vs 40mm). The main advantage of RevoKnuckle compared to MacPherson struts is the reduction in torque steer, especially for high powered front-wheel drive (FWD) applications.
The Tilting Suspension System [27] (also known as the Leaning Suspension System) is not a different type or geometry of construction; moreover, it is a technology addition to the conventional suspension system. This kind of suspension system mainly consists of independent suspension (e.g., MacPherson strut, A-arm (double wishbone)). With the ...