Design Load Calculator

Heavy-Duty Bushing Design Load Calculator

Determine the load on a single bushing from the actual reaction force, support configuration, and impact factor. Select a reference material to automatically verify if the design pressure (p) and PV parameters are within standard engineering guidelines.

Note: Vehicle GVM (e.g., 80 tonnes) is not the load on one bushing. Enter the actual reaction force at the pivot (derived from structural analysis), then let the tool distribute it according to the bearing arrangement.

1 · Inputs & Material Selection

Actual reaction force at pivot (R) Measured/computed reaction, not vehicle GVM.

Force unit

Reference Material (Automatic PV/Pressure Verification) Select an alloy to compare computed results against typical allowable limits (assumes lubricated conditions).

Supports on side A (left) Integer. Assumes equal load sharing.

Supports on side B (right) Integer. Assumes equal load sharing.

Bushings per support (arrangement) Integer. e.g., 2 for a trunnion with two bearing eyes.

Impact / dynamic factor (K) Typical 1.5–2.5 for haul-truck shock.

Bore diameter (D) mm — for bearing pressure computation.

Bushing length (L) mm — effective load-bearing length.

Oscillation amplitude (zero-to-peak) degrees — for surface velocity / PV limits.

Cycle frequency (cpm) cycles per minute.

Asymmetric load split between sides (enter side A share below)

2 · Results & Verification

Total supports (n_A + n_B)

—

supports

Load per support

—

Design load per bushing (incl. impact K)

—

Bearing pressure (p)

—

MPa

Mean surface velocity (v)

—

m/s

PV value

—

MPa·m/s

Model:
Load per support = R / (n_A + n_B) [or R·s_A/n_A and R·(1−s_A)/n_B if asymmetric]
Load per bushing = (Load per support) / (bushings per support)
Design load per bushing = Load per bushing × K
p = Peak Design load / (D × L) [projected area] → MPa
v_mean = (2/π)·(D/2)·(2π·f·α) , with f in Hz, α in rad → m/s
PV = p × v_mean → MPa·m/s

For Engineering Reference Only: This tool provides a preliminary distribution of the supplied reaction force and indicative pressure/PV calculations. The material reference limits assume standard lubricated conditions and moderate environmental factors. Final bushing material selection, dimensioning, and fitness for service shall be verified by a qualified engineer against the complete duty cycle — including static/dynamic limits, oscillation angles, shaft surface hardness, lubrication regimens, clearance, and fatigue loads.