The KPI angle stands for King Pin Inclination.
Understanding the King Pin Inclination (KPI)
The KPI angle, also known as King Pin Inclination, is a fundamental alignment angle in a vehicle's steering and suspension system. Based on information from May 29, 2017, this specific angle is referred to as the king pin inclination.
Purpose and Effects of KPI
The core function of the KPI angle is to create a vertical displacement of the vehicle body during the steering process. As noted in the reference, "The purpose of the KPI is to produce vertical displacement of the vehicle in during steering in an upward direction." This means that when the wheels are turned left or right, the vehicle body is slightly lifted upward.
This upward lifting action is not just a side effect; it serves a crucial purpose: it generates a self-centering torque. This torque helps the steering wheel naturally return to the straight-ahead position when released. The reference highlights this by stating, "This lifting effect produces a self centering torque similar to that of caster."
The degree of this lifting and self-centering effect is proportional to the angle itself. "The larger the KPI, the larger the effect," indicating that increasing the KPI angle results in a more pronounced self-centering action.
In summary, the KPI angle contributes significantly to steering stability and the vehicle's tendency to track straight, working alongside other alignment parameters like caster.
- Function: Causes the vehicle to lift slightly as the wheels are steered.
- Benefit: Creates a torque that helps the steering return to the center position.
- Analogy: Provides a self-centering effect similar to the caster angle.
- Impact: A greater KPI angle results in a stronger self-centering force.
Key Summary
- KPI: Stands for King Pin Inclination.
- Action: Lifts the vehicle when steering.
- Result: Generates self-centering torque.
