An eccentric gearbox (also called a cycloidal gearbox) is a speed reducer in which an eccentrically driven cam disc rolls on a ring of pins. Force is transmitted through rolling contact instead of gear teeth — the load is shared across many contact points simultaneously. This enables very high reductions in a single stage, high shock resistance and long service life.

The ACBAR eccentric gearbox achieves ratios from 2.5:1 to 13,600:1 in a single stage — coaxial and compact. Planetary gearboxes need several stages for high ratios and grow accordingly; strain wave gearboxes are typically limited to about 160:1. Multi-stage ACBARs achieve virtually unlimited ratios.

Yes. ACBAR gearboxes have lifetime lubrication, no oil fittings and all-round sealing. There are no lubrication intervals and no oil changes. All moving parts run on rolling bearings. Many units have been in service for decades without maintenance.

Six frame sizes from 80 Nm (type 11) to 1,000 Nm (type 501) nominal torque. Special versions above 15,000 Nm have already been built — ask us.

All IEC standard motors with B5 or B14 flange — from IEC 56 (0.06 kW) to IEC 112 (4.0 kW), depending on frame size. Standard shaft ends and standard runout are sufficient; no additional shaft seal is required.

In any position — horizontal or vertical. Twelve mounting arrangements are available (B3, B5, B6, B7, B8, B14, V1, V3, V5, V6, V18, V19), foot- or flange-mounted.

Yes. Standard backlash is 1.2° to 1.3° at the output shaft; reduced-backlash versions achieve 0.2° to 0.4° depending on frame size. For the highest positioning demands, we advise on the right configuration.

In a toothed gearbox, an overload hits a single tooth flank. In an ACBAR, rolling contact shares the load across many points at once — shocks and load reversals that would damage gear teeth are absorbed by the eccentric principle. That is why it has been used for decades in travel, hoisting and slewing drives under rough conditions.

As a rule, yes. AKIM keeps complete records going back to the 1920s and manufactures spare parts and overhauls even for historical gearboxes. Send us the nameplate data.

AKIM AG in Altendorf, Switzerland — a gear manufactory with a history since 1923. ACBAR has been on the market for over 60 years; development and production take place entirely in Switzerland (ISO 9001).