Shafts

Shafts for roll stops – rotary axis of the flap mechanism

Shafts are the central rotary axes on which the flaps of a roll stop are mounted. They transfer the operating force from the lever to all flaps in a row arranged in parallel and thus ensure synchronous opening and closing. At SULEJ Ladebordwand you will find shafts in different diameters, lengths and end machinings, matched to common platform configurations on the market – as a dimensionally stable axis for the flap mechanism of the tail lift.

Materials and end machining – round, square and hexagonal ends

Shafts for roll stops are usually made of tempered steel or high-grade structural steel with additional galvanising. Depending on the lever holder, the shaft ends are round, square or hexagonal, often with a cross groove for split pins. The length depends on the platform width, the diameter on the bearing in the shaft holders. The surface is usually ground so that the shaft runs with low play and without friction points in the bushings of the shaft holders. Deformations or rust on the running surface quickly cause stiff flaps.

What to consider during selection and replacement

Decisive factors are diameter, total length, end shape and the distance of the cross grooves. During replacement, a visual inspection of the bearing bushings in the shaft holders is worthwhile – worn bushings should be replaced together with the shaft. Bent or scored shafts can rarely be straightened and lead to increased load on flaps and lever. Before installation, the shaft is cleaned and lightly greased in the bearing area so that the flap mechanism remains smooth-running.

Benefits at a glance

• Synchronous opening and closing of all flaps arranged in parallel
• End designs available for different lever holders
• Corrosion-protected surfaces for long service life
• Diameters and lengths matched to common shaft holder designs

A dimensionally accurate shaft keeps the flap mechanism smooth-running and reduces wear on bushings, lever and securing elements.