Official Answer
Answer
Lateral buckling occurs when a Crest-to-Crest wave spring's free height $L_0$ is significantly larger than its mean diameter $D_m$ (typically $L_0/D_m > 4$). Under load, the spring behaves like a slender column and bows outward. This leads to non-axial loading, uneven stress distribution, and potential contact with the housing walls, which increases friction and wear. The solution involves using an internal guide rod or an external sleeve to provide lateral support. Mathematically, the critical buckling load $P_{cr}$ can be estimated using a modified Euler's formula $P_{cr} = \frac{\pi^2 \cdot E \cdot I_{eff}}{(K \cdot L)^2}$, where $I_{eff}$ is the effective moment of inertia of the wave structure.
