Wishbone suspension is implemented using two lateral arms of unequal length, the upper arm is shorter. Through these wheels are suspended from the shoulders to the axle, frame or axle housing. A suitable choice of the proportion of the length of both arms can be achieved very favorable kinematics. Keystone correction is suitable as a control, and may also be used as a driver.
Keystone correction is made up of upper and lower wishbone. The projection of the transverse vertical plane of the shoulders are trapezoid, there was the name of the axle. The ends of both arms are connected to the pin on which the wheel is stored.
kinematic diagram wishbone axles
During suspension wishbone axle is a change in camber, toe-wheel and track change. All these changes have an adverse effect on the car ride, a suitable choice of geometry of the shoulder, we can minimize these adverse effects. For example, is the instantaneous center wheels roll right away from the wheel, then the deflection generated only small changes in deflection and track, which is good for handling. For small displacements, the movement round determines Copying circle from point P to trail bikes. Point S is the center of the roll body.
For the special case of parallel arms, the center of the pitch wheel P at infinity and the center of the pitch with the body lying on the road. For small deflection wheels camber does not change at all and track slightly. However, this only applies for as long arms.
To capture the forces in the track of the vehicle used triangular arms that are stored on rubber bushes. Lower arm is more burdened, so it is more robust construction. For vehicles with front engine unit requires more space in the upper arm, upper arm so it is much shorter than the bottom.
Automotive springs are usually deposited on the lower arm, lower arm because due to their greater length takes place at smaller angular deflection movements, spring can be tightly woven into the shoulder. If the spring is stored on the upper arm, it would be stored articulated as not to cast too large bulge in the spring compression.
trapezoidal front axle BMW X6
The advantage of option wishbone axle is very low compared to building axle MacPherson or with a rigid axle. Its construction is expensive and therefore most often used on the front axle of the upper classes. Axle ensures good driving characteristics.
What you did not know
The front axle has a trapezoidal Czech motorist great experience without maybe knows. Trapezoidal correction had a number of Skoda cars such as the legendary eMBéčko. After eMBéčku her then without major modifications inherited a myriad of "one hundred and twenties" until the onset of Favorita. Skoda Favorit thanks to a new concept of front engine front drive and got the front axle type MacPherson .
trapezoidal front axle Škoda 1000 MB
Video
Text: John Sajdl
Photo: www.autolexicon.net, www.embecko.inczech.net, www.bmw.com, www.automotive-illustration.co.uk, www.dodge.com
Keywords: axle, suspension, keystone correction, double wishbone
Partners
What interested us on YouTube
Competition
Be smart and win great prizes with autolexiconem:
The ignition system of the mixture in the cylinders with two candles is called:
The contest is closed, we know the winner!
