RV Gear Reducer, whose full name is Rotary Vector Gear Reducer, is a high-precision, high rigidity precision transmission device and a core component in industrial robots, high-end equipment and other fields. It achieves the conversion of high-speed low torque input to low-speed high torque output of the motor through a unique gear transmission structure, while ensuring high precision, stability, and high load capacity of motion transmission.
RV Gear Reducer is a two-stage reduction mechanism that combines planetary gear transmission with cycloidal pinwheel transmission. Its core function is to significantly reduce speed while significantly increasing torque and maintaining extremely high transmission accuracy. Compared with ordinary reducers, RV Gear Reducer's key advantage lies in dispersing loads through multi tooth meshing, which can maintain extremely small transmission errors even at large reduction ratios (usually 10-100:1) (return errors are usually less than 1 arcminute, and high-precision models can reach 15-30 arcseconds).
The structure of RV Gear Reducer is compact but precise and complex, mainly composed of input part, reduction transmission part, and output part, which work together through gear meshing:
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Input section |
Primary reduction of planetary gears |
The input section includes the input shaft, sun gear, and planetary gears. The power of the motor is transmitted to the sun gear through the input shaft, and the sun gear meshes with multiple planetary gears, driving the planetary gears to revolve around the sun gear while rotating on their own, completing a first stage reduction. This step initially reduces the speed and increases the torque, providing stable input for subsequent transmission. |
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Core transmission part |
Cycloid pinwheel two-stage reduction |
The deceleration transmission part is the "soul" of the RV gear reducer, consisting of an eccentric shaft, a cycloid wheel, and a needle wheel: -The rotation of planetary gears is transmitted to cycloid gears through eccentric shafts, and each eccentric shaft drives two cycloid gears with a phase difference of 180 ° to perform eccentric motion (symmetrical design can counteract centrifugal force and ensure smoothness). -The tooth profile of the cycloid wheel is a special cycloid curve, which forms a multi tooth meshing with the needle wheel (uniformly distributed needle teeth) fixed on the shell - the number of teeth meshing simultaneously during motion can reach more than 2/3 of the total number of teeth. This design is the key to its high rigidity and load resistance. |
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Output section |
Power conversion and output |
The eccentric motion of the cycloidal gear is converted into the rotational motion of the output flange through the bearings on the crankshaft, and ultimately transmits the power that has undergone two-stage deceleration to the load end. Throughout the process, power is transmitted layer by layer through gear meshing, achieving a large reduction ratio while ensuring smooth operation through structural optimization. |
Here In this page, we introduce RV-6E Reducers from TallMan Robotics, which is the top leading manufacturer of RV Gearboxes, you will see data sheet, production pictures,videos as follows:
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RV-E Series: Main Bearing Built-in Type Cycloidal Gearboxes |
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Also You are welcome to watch more projects or visit our video gallery by Youtube: https://www.youtube.com/@tallmanrobotics
In the field of precision transmission, RV gear reducers complement harmonic reducers and planetary reducers, but have better core performance:
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Comparison items |
RV gear reducer |
Harmonic reducer |
Planetary reducer |
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Rigid |
Extremely High |
Medium |
Medium |
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Return error |
<1 arcminute |
<30 arcseconds (some models) |
relatively large (usually>5 arcminutes) |
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Lifespan |
Long (3-5 times longer than harmonic reducers) |
Medium (fast wear under high-speed heavy loads) |
Medium (fast wear under high-speed and heavy loads) |
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Torque density |
High |
Medium |
Medium |
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Applicable scenarios |
Heavy duty high-precision (robot joints) |
Light load high-precision (end effectors) |
Mid to low end transmission (ordinary machinery) |
The application of RV gear reducer has expanded from industrial robots to multiple high-end fields:
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Industrial robots |
Joint drives for six axis robots, collaborative robots, and SCARA robots. |
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Precision machine tools |
Key components such as CNC turntables and servo tool holders ensure machining accuracy. |
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Aerospace |
Satellite antenna drive, radar steering mechanism, capable of withstanding extreme environmental tests. |
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Medical equipment |
surgical robots, precision detectors, achieving sub millimeter level operations. |
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New Energy |
Wind power variable pitch system and photovoltaic tracking device to improve energy conversion efficiency. |
At the industrial level, RV gear reducer has long been monopolized by Japanese companies such as Hamonaco and Sumitomo, and China once relied on imports. In recent years, domestic RV gear reducers has gradually approached international standards through technological breakthroughs, breaking foreign monopolies and promoting the independent and controllable development of China's robotics industry, reducing high-end equipment manufacturing costs, and becoming one of the core indicators for measuring the country's high-end manufacturing strength.
RV gear reducer is the "power joint" of high-end equipment, which perfectly integrates high precision, high rigidity, and high reliability through exquisite mechanical design, supporting the development of industrial automation and intelligent manufacturing. With the increasing demand in fields such as robotics and precision manufacturing, technological innovation in RV gear reducers will continue to drive the performance leap of high-end equipment and become a key core component in the era of intelligent manufacturing.
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