Planetary gear reducer RP42

coaxialsolid-shaftkeyed shaft

Product overview

• RP42 is a 42 mm planetary gearbox / gear motor designed for demanding industrial automation and robotic applications. Standard ball-bearing support, radial load up to 200 N, axial load up to 100 N, reduction ratios from 1:3.7 to 1:721, rated torque up to 15 N·m, momentary peak torque up to 38 N·m.

Key facts for engineering buyers

• Product category: Planetary Gear Motors & Gearboxes
• Motor family: Planetary gear motor / gearbox
• Brand / manufacturer: KWC Motor, Dongguan KWC Machinery Co., Ltd.
• Typical applications: industrial automation, AGVs/AMRs, robotics, precision equipment

Specification signals

• Diameter: 42 mm

Customization and sourcing notes

• OEM/ODM options: voltage, speed, torque, shaft design (8 mm standard, 10 mm optional), cable or connector, gearbox integration, control interface, noise/EMC targets.
• Quotation: price provided after confirming application, specifications, quantity and customization requirements.

Core applications & solutions

• Heavy-duty industrial automation & AGVs: suited for wheel-hub drives of AGVs, automatic packaging machines and heavy valve actuators; rated torque up to 15 N·m and axial load capacity up to 100 N make it suitable as a mobile-robot power core.
• Large-scale robotics & specialized equipment: used in inspection-robot chassis, robotic arm joints and medical-rehabilitation exoskeletons; 38 N·m momentary shock resistance improves reliability under collisions or emergency stops.

RP42 gearbox technical specifications (table)
Gear ratio | Stages | Length L (mm) | Rated torque | Max momentary torque | Efficiency
1/3.7 ~ 1/5.2 | 1 | 34.0 | 1.5 N·m | 3 N·m | 90%
1/14 ~ 1/27 | 2 | 44.2 | 4 N·m | 12 N·m | 81%
1/50 ~ 1/139 | 3 | 54.4 | 10 N·m | 25 N·m | 73%
1/189 ~ 1/721 | 4 | 64.6 | 15 N·m | 38 N·m | 66%

Mechanical parameters

• Gearbox outer diameter: 42 mm
• Output shaft diameter: 8 mm standard (10 mm optional)
• Output shaft supported by ball bearings
• Maximum radial load: 200 N
• Maximum axial load: 100 N
• Momentary impact torque resistance: up to 38 N·m

Design and quality notes

• Load support: radial capacity up to 200 N achieved through ball-bearing support and robust gear materials.
• Assembly: press-fit verification with shaft press-in force up to 150 N; radial backlash controlled within 0.06 mm.
• Environmental option: wide-temperature grease available for -15°C to +80°C.

Purchasing FAQ (selected)

• Difference vs RP38: RP42 provides higher torque and load capacity (RP42 rated up to 15 N·m, momentary 38 N·m, 200 N radial; RP38: 8 N·m rated, 24 N·m momentary, 150 N radial).
• Extreme applications: suitable for AGV/AMR mobile robots, heavy automatic doors, industrial robot arm joints and systems requiring high torque and reliability.
• Press-in force: output shaft can withstand up to 150 N press-in force for secure press-fit assembly.

Characteristics / technical specifications

• Model / Series: RP42
• Brand / Manufacturer: KWC Motor, Dongguan KWC Machinery Co., Ltd.
• Diameter: 42 mm
• Reduction ratios available: 1:3.7 to 1:721
• Stages: 1 to 4
• Length L (mm) by stage: 34.0 (1), 44.2 (2), 54.4 (3), 64.6 (4)
• Rated torque by stage: 1.5 N·m (1), 4 N·m (2), 10 N·m (3), 15 N·m (4)
• Max momentary torque by stage: 3 N·m, 12 N·m, 25 N·m, 38 N·m
• Efficiency by stage: 90% (1), 81% (2), 73% (3), 66% (4)
• Output shaft options: 8 mm standard, 10 mm optional; supports keyway, threaded shaft or D-shaft
• Bearing type: standard ball bearings
• Maximum radial load: 200 N
• Maximum axial load: 100 N
• Press-fit verification: shaft withstands up to 150 N press-in force
• Radial backlash: controlled within 0.06 mm
• Custom options: shaft profiles, motor matching, grease for -15°C to +80°C