Compact three-wheel electric forklifts are widely deployed in narrow aisle warehouses, small-sized cargo sorting stations and confined working scenarios, where their flexible steering and small turning radius bring great operation convenience. However, the compact body structure and high-frequency steering operation also bring higher requirements for anti-roll-over performance, and reasonable structural parameter setting is the core foundation to guarantee stable running.

For the gravity center related design of anti-roll-over structure, the static full-load gravity center height should be controlled within the reasonable range matched with the maximum lifting height. Under standard no-load state, the lateral gravity center offset should not exceed 4% of the whole vehicle’s lateral wheelbase, which can effectively reduce the lateral overturning risk when the vehicle turns on the slope. When designing the counterweight part, the matching weight should be evenly distributed on the rear side of the body, to avoid local weight concentration that causes unbalanced longitudinal stress.

For the wheelbase and wheel track parameter setting, the ratio of front and rear wheelbase to lateral wheel track should be kept in the proper interval adapted to the whole vehicle load tonnage. For 1 to 2 tonnage compact three-wheel electric forklifts, the lateral wheel track should not be less than 65% of the total body width, while the minimum ground clearance should reserve enough buffer space for uneven pavement without excessively lifting the overall gravity center. The steering maximum rotation angle should be matched with the corresponding limit speed reminder structure, to prevent sharp turn under high speed condition.

For the auxiliary anti-roll-over structural parts, the rigidity parameters of the body side support beam should meet the stress test standard under the 15-degree lateral tilt state, without obvious permanent deformation. The installation position of the safety limit baffle on the mast should avoid extra lateral moment generated by the lifting goods under partial load condition, and the structural connection gap of all load-bearing parts should be controlled within the allowable tolerance range to eliminate extra shaking in operation.

After the preliminary parameter setting, all indicators need to be verified under simulated actual working conditions including uniform speed turning, sloped pavement running and partial load handling, to adjust each parameter to the balanced state that meets both the compact size demand and anti-roll-over performance requirement.