Overview
Manuals
Compatibility & Industry
Operating principle
Axis-2 Gear Matching
Features:
- Explicitly engineered for Axis 2 (the lower arm/boom axis) of the robot, which bears the brunt of the arm's lifting force
- Uses an RV precision series (specifically RV-320E3) cycloidal design. This layout provides zero-backlash operation and exceptional torsional rigidity
- Features a precise reduction ratio of i = 171, converting high-speed servo motor rotations into high-torque joint movements
The ABB 3HAC044361-003 is a high-precision RV reducer designed specifically for industrial robots. This model (e.g., RV-320E3) primarily serves as a core mechanical component for the second axis (Axis 2) of the ABB IRB 4600 series industrial robots. Its core function is power transmission, converting the high-speed, low-torque output of the servo motor into the high-torque, low-speed power required for robot joint movements through gear ratios up to 1:171. Since the second axis is the main joint controlling the robot's forward and backward swing and overall cantilever load-bearing capacity, this reducer plays a crucial role in supporting the robot arm's weight and ensuring its lifting capacity.
This reducer boasts extremely high mechanical rigidity and micron-level low backlash (low dead zone), designed specifically for demanding automated production lines. Its robust solid/bolted output shaft design can withstand the immense cantilever stress and impact loads generated during the high-speed reciprocating motion of robots. In practical applications (such as automotive welding, material handling, and workpiece painting), this component ensures extremely high path tracking accuracy and repeatability for robot end effectors. Furthermore, its long-life, high-density sealing structure effectively prevents internal lubricant leakage and resists the intrusion of external industrial dust, thus ensuring long-term, continuous, and stable operation of the robotic arm.
The 3HAC044361-003 ABB Robot Reduction Gear Unit may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
ABB 3HAC044361-003 Robot Reduction Gear Unit manual(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
3HAC044361-003 is a key original equipment manufacturer (OEM) replacement part for ABB IRB 4600 series industrial robots. With its high precision and powerful lifting capabilities, robots equipped with this gearbox are widely used in a variety of demanding production lines:
1.Automotive factories: for heavy material handling, spot welding, and machine tool loading and unloading;
2.Logistics and palletizing: for rapid packaging and heavy-duty box stacking;
3.Aerospace integration: powering robots for handling ultra-large aerospace structures or operating heavy-duty end effectors for structural drilling.
The 3HAC044361-003 operates on a two-stage reduction transmission mechanism combining planetary gears and cycloidal gears. The first stage of reduction is driven by a central gear powered by a servo motor, which in turn drives multiple planetary gears to rotate externally. The second stage is its core cycloidal structure. When the eccentric shaft of the planetary gears rotates, it drives the internal cycloidal wheel to perform an eccentric motion.
At this time, the teeth of the cycloidal wheel mesh with pins fixed to the outer casing, causing the cycloidal wheel to rotate slightly in the opposite direction while rotating on its own axis. This multi-tooth meshing "cycloidal gear" motion eliminates most of the gear backlash through pure rolling, thus achieving ultra-high torque output and near-zero backlash rigid transmission within a very small volume.
Use the complete ABB article number when matching this reduction gear unit to an IRB 4600 axis-2 assembly. The robot variant, mounting pattern and mating drive components must agree with the service documentation.
