Industrial Robot Joint Servo Motor RV Cycloidal Reducer Gear Box

An RV reducer (Rotary Vector Reducer) is a high-precision speed reducer designed for motion control applications, featuring a planocentric reduction mechanism.
Its core lies in a two-stage reduction design:
1. First Stage Reduction – Spur Gear Mechanism:
The input shaft transmits rotation through the input gear to the spur gear, achieving primary speed reduction.
2. Second Stage Reduction – Differential Gear Mechanism:
The spur gear is connected to a crankshaft, which drives the RV gear in an eccentric motion.
The RV gear has one tooth fewer than the pin gear, thus achieving a high reduction ratio.

Rated Torque (To):
The allowable torque when operating at the rated output speed — not the absolute load limit.
Allowable Starting/Stopping Torque (Ts1):
The maximum torque allowed during acceleration and deceleration, typically 2.5 times the rated torque.
Maximum Instantaneous Torque (Ts2):
The allowable torque during emergency stops or impacts, typically 5 times the rated torque.
Allowable Output Speed (Ns0):
The maximum output speed under no-load conditions, affected by temperature and load.
Backlash and Lost Motion:
Backlash refers to the torsional angle when torque is zero;
lost motion refers to the hysteresis curve width within ±3% of the rated torque.
RV reducers usually maintain backlash within 1 arcminute.
Torsional Stiffness:
The torque required per unit of torsional angle — reflects the reducer’s resistance to deformation.
Service Life:
The rated service life is typically 6,000 hours under rated torque and speed.

Installation Accuracy:
Ensure flatness and perpendicularity of the mounting surface to avoid eccentric loads.
It’s recommended to use a dial gauge, keeping vibration amplitude within 0.02 mm.
Lubricant Selection:
Common lubricants include VIGOGREASE REO.
Standard replacement cycle: 20,000 hours; shorten the interval under high-temperature conditions.


Temperature Management:
Surface temperature must not exceed 60°C.
If exceeded, use cooling measures or derate operation.
Small-Angle Operation:
When the rotation angle is less than 10°, lubrication may be insufficient — consult the manufacturer.
Bolt Tightening:
Use disc spring washers and hex socket bolts, tightened to standard torque to prevent loosening.

The HONPINE Flange RV Reducer Gearbox adopts a flange-sealed design, which encloses the lubricant and motor inside.
This simplifies installation, extends service life, and reduces maintenance needs.

When selecting an RV reducer, consider installation orientation, structural form, operating conditions, and environment.
Calculate load inertia and steady torque, set the operating mode, and determine acceleration/deceleration torque, average speed, and average load torque.
Finally, calculate the required rated torque based on service life requirements.
For detailed selection guidance, please contact HONPINE for professional assistance.
Contact Information
Phone/WhatsApp: +86 18994329920
Email: sales@honpine.com

Industrial robots are the primary application field for RV reducers.
The core advantages of an RV reducer include high rigidity, high precision, large transmission ratio, and long service life — making it irreplaceable, especially in heavy-load robotic joints.
The fundamental function of an RV reducer is to convert the motor’s high-speed, low-torque output into low-speed, high-torque power, ensuring precise motion control.
Transmission accuracy can typically reach arc-second levels, and the service life commonly exceeds 10,000 hours.

The HONPINE RV Reducer Gearboxes achieves exceptional precision, rigidity, and durability through advanced tooth profile optimization and structural engineering.
Its core technologies include:
Optimized cycloidal gear tooth design
Integrated housing structure for higher rigidity and stability
Optimized bearing configuration to ensure smooth torque transmission
Key components such as cycloidal gears and pin rollers are made from high-strength alloy steel and special composite materials, providing superior strength, wear resistance, and toughness.
Enhanced material performance significantly extends product life — with a rated service life exceeding 15,000 hours, meeting the requirements of high-end robotic applications.
HONPINE’s optimized heat treatment process further improves component hardness and stability, reduces wear rates, and minimizes performance degradation under continuous operation.