Virtual Spindle Length and Offset
Branch ID: 350 Request Number: 50000350
The kingpin axis on an SLA or Macpherson strut suspension is defined by two points (the upper ball joint and the lower ball joint in the SLA suspension, the upper strut mount location and the lower ball joint in the case of the Macpherson strut suspension) When the kingpin axis is not defined by two distinct points, it must be calculated virtually, using the motion of the spindle to calculate the instant axis of rotation of the knuckle. The virtual requests (numbers 50000310-50000350) use this method to calculate the kingpin location, and parameters that rely on the kingpin location. These requests should be used on suspensions that do not have a clearly defined kingpin axis, such as a 4 link or 5 link front independent suspension.
| Component | Unit | Comment |
|---|---|---|
| 1 (X): Left Virtual Spindle Length | mm | The true left spindle length or the distance between the left wheel center and the point on the spindle which is closest to the virtual kingpin axis. |
| 2 (Y): Right Virtual Spindle Length | mm | The true right spindle length or the distance between the right wheel center and the point on the spindle which is closest to the virtual kingpin axis. |
| 3 (Z): Average Virtual Spindle Length | mm | The mean of components 1 and 2. |
| 4 (RX): Left Virtual Spindle Offset | mm | The true left spindle offset or the minimum distance between the left spindle axis and the left virtual kingpin axis. |
| 5 (RY): Right Virtual Spindle Offset | mm | The true right spindle offset or the minimum distance between the right spindle axis and the right virtual kingpin axis. |
| 6 (RZ): Average Virtual Spindle Offset | mm | The mean of components 4 and 5. |