Suspension brief talk McPherson suspension

As independent suspension in said form of the highest rates of suspension, McPherson (U.S. MacPher-son Strut, Hong Kong Cantonese transliteration "MacPherson") are widely used in the field of civilian vehicles. McPherson Suspension named from its inventor "McPherson. McPherson, its structure is compact, efficient operation and become the visibility the highest form of front suspension, it is not the first to be invented form of independent suspension. The initial suspension systems with non-Unibody, that is, the girders frame. Be able to so easily suspension system-oriented institutions, as well as elastic elements all the double wishbone system is installed on top of the girders, is the emergence of the earliest and highest penetration rate (in fact, there is no other form of independent suspension, can reasonably beam-type frame with). With the Unibody was invented, the size of the car can be to a large extent to compact. The suspension system is also compact needs. McPherson suspension system concept, as the shock absorbers of the elastic element also served as steering, structural reinforcement, as well as pass the role of force and torque, which can simplify the guide mechanism, freeing up more space for the engine compartment.
McPherson suspension structure is quite simple: under the wishbone is the only guide mechanism components responsible for passing the vertical and horizontal forces, thus the lower wishbone shape similar to the double wishbone wishbone, are presented to the "A" shaped, in a complex environment force able to combine the strength in all directions; elastic element of shock absorbers and column at the same time to integrate the spring, shock absorption, as well as axial, lateral force structure, so the structure of the shock absorbers and column than other forms of shock absorbers wants more rugged, more visual stout. It should be emphasized that, "McPherson front suspension designed, it is a necessary condition for the shock machine column is also responsible for steering. The rear suspension structure similar to the Subaru Impreza (9 generations ago), can only be called "class McPherson.
MacPherson shock absorbers and column, one end with the steering gear the rigid fixed, the other end of that is on a fixed point, is installed in the top of the top of the tower we commonly known as "shock absorbers". On fixed point to take into account the rotation of the shock absorbers and column (with the rotating wheel) as well as to withstand the forces and moments. McPherson suspension "top", compared to the double wishbone or multi-link system, its design strength requirements are higher. Parenthetic digression for reinforcing the top of the tower strength, also derived from the horizontal struts called "top", around the top of the tower rigid connection, making the entire engine compartment of the original semi-open section to see from the front past a closed quadrangle, to eliminate the deformation of the ends overhead because of the force to the intermediate bent.
The McPherson suspension advantages of believe that many people are familiar with: compact structure, occupy less space; frame stress points less and less frame is designed to be simple by force; components, and low cost. The disadvantage is that the wheel moves up and down, the motion law of the main pin is determined by the geometric angle of the lower rocker arm, the trajectory is a single arc, and not by changing the constraint condition of the steering knuckle, to obtain the complex positioning parameter variation, so in motion and comfort, McPherson is not especially good. It can be said McPherson is the most moderate design, low cost, reliable work, but losing performance.

Figure: McPherson suspension, the BMW 5 Series, take up less space, so welcomed by the vast majority of the world's automobile manufacturers.

 This is a complete picture of the McPherson suspension lower arm connected to the lower half of the steering knuckle, shock absorber column is fixed in the upper part of the steering knuckle, steering tie rod control steering section with shock absorbers and column overall rotation.