The AB worm gear drive unit is a compact right-angle power transmission terminal utilizing a high-precision planar double-enveloping hourglass worm gear set or ZC-type worm gear pair. It is designed for industrial applications demanding very high reduction ratios, moderate output torque, and self-locking capability – such as valve actuators, conveyors, hoisting equipment, packaging machinery, agricultural machinery, and small lifting devices. The housing is made of high-strength cast iron or aluminum alloy. The internal high-capacity worm gear pair features a worm made of 40Cr or 20CrMnTi steel (case-hardened to HRC50-55, ground and polished) and a worm wheel centrifugally cast from high-grade tin bronze (ZCuSn10P1). Through optimized tooth geometry and meshing parameters, the AB worm gear drive achieves total reduction ratios from 36:1 to 178:1 and output torque ratings from 750 N·m to 6,500 N·m, providing reliable long-term operation under frequent start-stop and low-to-medium speed conditions. The unit offers reliable back-self-locking, supports various mounting orientations and shaft arrangements, and accommodates standard motors, servo motors, or handwheels – realizing a true 4-in-1 integration of “high reduction, moderate torque, self-locking safety, and compact installation”.

Product Image of AB Worm Gear Operator

1. High-Precision Worm Gear Set : Planar double-enveloping or ZC tooth profile. Worm material: 40Cr or 20CrMnTi, case-hardened to HRC50-55, ground to Ra≤0.8. Worm wheel: ZCuSn10P1 tin bronze, centrifugally cast. Load capacity is more than 30% higher than ordinary Archimedean worm gears.

2. Wide Ratio Range & Torque Coverage : Reduction ratio covers 36:1 to 178:1. Rated output torque from 750 N·m to 6,500 N·m – suitable for valve actuation, lifting, conveying, and other medium-duty applications.

3. Reliable Back-Self-Locking : Leveraging the friction angle characteristics of worm drives, reliable self-locking is achieved at ratios ≥36:1, effectively preventing reverse rotation – ideal for hoists, valve actuators, and rotary tables.

4. High Efficiency & Long Service Life : Transmission efficiency ranges from 70% to 85% depending on ratio. Gear teeth are run-in and phosphated, providing extended contact fatigue life with a design life of at least 15,000 hours.

5. Compact Modular Design : Topology-optimized housing with small footprint. Input/output interfaces conform to international standards, allowing quick adaptation to IEC motors or handwheels. Supports M1 to M6 mounting orientations.

6. Reliable Sealing & Long-Life Lubrication : Shaft ends feature double-lipped oil seals (FKM) achieving IP65 protection. Pre-filled with synthetic worm gear oil (ISO VG320 or 460) – maintenance-free for up to 10,000 hours under normal conditions.

Structural Drawing of AB Worm Gear Operator

Material Specification for Turbine Unit

Standard requirements for external dimensions

Design Standard: ISO 5211 Technical Specification

Protection Class: IP65

Flange Standard: ISO 5211 ISO 5210

Outline Drawing of AB Worm Gear Operator

Outline dimension table(Unit: mm)

Connecting Flange Dimensions and Torque

ISO 5211 and ISO 5210 Flanges and Torques

Dimensions for Output Bore and Input Shaft of AB Worm Gearbox

Dimension Table for Output Bore and Input Shaft of AB Worm Gearbox

Outline Dimension Drawing for Handwheels of AB Worm Gearbox

Handwheel Diameter of AB Worm Gearbox

Outline Dimension Table for Handwheels of AB Worm Gearbox