Hollow Rotary Tables,Cam Indexers,Planetary Gear Reducers 
Cycloidal gear reducers, also known as cycloidal drives or cycloidal speed reducers, are mechanisms designed to reduce the speed of an input shaft by a specific ratio while maintaining compactness and low backlash.The core component of these reducers is the cycloidal disc, which traces a cycloidal geometry and operates in an eccentric, cycloidal motion.
This unique design enables high reduction ratios in relatively small sizes.One of the distinguishing features of cycloidal gearbox is their ‘gearless’ design, which operates in compression rather than shear.
RV-SC is a cycloidal reduction gearbox with a hollow-shaft input flange configuration. Cycloidal Gear Reducer uses two offset cycloidal discs driven by an eccentric bearing assembly. These discs engage a fixed ring gear populated with cylindrical pins, producing high-ratio speed reduction through rolling contact. The hollow input bore accepts a motor shaft directly, eliminating couplings. The SC designation specifies a flat, flanged input face for direct servo or stepper motor mounting. Output torque transfers through output pins engaged in the cycloidal disc holes.
RV-SC Series: Input Flange Hollow Type Cycloidal Gearboxes
 |  |  |  |
Cycloidal gear reducers are utilized in a diverse range of applications due to their high precision, torque density, and robust construction.
Industrial applications with RV-SC Input Flange Hollow Cycloidal Gearbox
Industrial Application Case 1: Robotic Welding Arm Joint Actuator
A tier-1 automotive body shop integrated RV-SC-100 units into the wrist and elbow joints of six-axis MIG welding robots. Each joint required sub-1-arcminute positioning to hit weld seams on door frame assemblies. The hollow shaft input accepted a 22mm servo shaft directly, cutting joint length by 34mm per axis. Peak torque demand reached 210 Nm during rapid repositioning moves. The gearbox sustained this load across three-shift production schedules without measurable backlash growth after 12,000 hours. Weld repeat accuracy held at ±0.08mm.
Industrial Application Case 2: Semiconductor Wafer Handling Stage
A 300mm wafer transport system used RV-SC-50 gearboxes to drive theta-axis rotation stages inside a vacuum-compatible transfer chamber. The application demanded zero particle generation and backlash under 0.8 arcminute. Designers selected sealed RV-SC units filled with low-volatility fluorinated grease. The hollow input bore routed encoder cables cleanly through the drive axis. Torque output of 55 Nm handled wafer carrier inertia during 180° flip cycles at 60 cycles per minute. The gearbox sustained cleanroom class ISO 3 compliance across 18 months of continuous operation. Stage repeatability measured ±0.05 arcminute. No lubrication migration or outgassing contaminated the process chamber during the qualification period.
FAQs about RV-SC Input Flange Hollow Cycloidal Gearbox
- What makes RV-SC Cycloidal Gear Reducers different from planetary types?
Cycloidal gearboxes use rolling contact between cycloidal discs and pin-ring gears. Planetary types use meshing gear teeth. Rolling contact distributes load across multiple contact points simultaneously. This delivers higher shock resistance, lower backlash, and longer service life under dynamic loading conditions. - What does the hollow input flange of Cycloidal Gear Reducers provide functionally?
The hollow bore lets the motor shaft insert directly through the gearbox center. This removes the need for a separate shaft coupling. It shortens the drive train axially, reduces part count, and improves torque transmission alignment between motor and gearbox. - What motor flange standards fit the SC input configuration?
RV-SC input flanges match IEC and NEMA servo motor bolt patterns. Common fits include IEC 80, 100, and 130 frame sizes. Custom adapter plates extend compatibility to Yaskawa, Fanuc, and Mitsubishi servo motor face dimensions. - How do users specify the correct RV-SC Cycloidal Gear Reducers size for an application?
Start with peak output torque, including dynamic load factors. Verify the rated torque at required speed stays within the thermal curve. Check radial and axial load ratings against the mechanical design. Confirm the input hollow bore fits the motor shaft diameter with appropriate tolerance fit.
You are welcome to watch more projects or visit our website to check other series or load down e-catalogues for further technical data.
