Precision cycloidal pinwheel RV gear reducer and harmonic reducer difference

The precision cycloidal pinwheel RV gear reducer has much higher fatigue strength, stiffness and life than the harmonic drive commonly used in robots, and the accuracy of the return difference is stable. Unlike the harmonic drive, the movement accuracy will increase with time. Significantly reduced. Therefore, the precision cycloidal pinwheel RV gear reducer is mostly used in the high-precision robot transmission in many countries. Therefore, the precision cycloid pinwheel RV gear reducer has the development trend of gradually replacing the harmonic reducer in the advanced robot transmission.

These products do have a substitution relationship on some models, but these types of reducers can only achieve partial substitution. In most cases, it is difficult to replace various types of reducers. For example, in terms of speed ratio, the speed ratio of the harmonic reducer and the cycloid RV gear reducer is much greater than that of the planetary reducer, so the field of small speed ratio is The world of planetary reducers. Of course, the speed ratio of the planetary reducer can be made larger, but it is difficult to replace the harmonic reducer and the cycloid RV gear reducer. In terms of rigidity, the rigidity of planetary reducer and cycloid RV gear reducer is better than that of harmonic reducer. Under the working conditions that reflect rigidity, it is difficult for harmonic reducer to perform well.

The characteristics of the harmonic reducer are light and small. In this regard, the planetary reducer and the cycloid RV gear reducer are difficult to achieve. Therefore, various types of reducers can only be replaced in some cases, but it is unrealistic if one product replaces another product in an all-round way.

Various types of reducers cannot replace each other, but a complementary relationship.

The two transmissions of cycloid RV gear reducer and harmonic reducer are complementary, but it is not ruled out that after structural design optimization and manufacturing process breakthroughs, local competition will be formed in the field of medium and low load applications.

The reducer, the core component of industrial robots, is the core of mechanical transmission. The speed and accuracy of the robot are related to the reducer. The reducers used by industrial robots mainly include: harmonic reducers and cycloid RV gear reducers.

Structure of precision cycloidal pinwheel RV gear reducer

RV-E is a two-stage reduction gear. The first-stage reduction is the external meshing of the input gear and the spur gear. The three spur gears are symmetrical to the output shaft at an interval of 120°.

The second-stage reduction drives the eccentric shaft through the spur gear, and drives the RV gear mounted on the eccentric shaft, causing the eccentric movement of the two RV gears. The two RV gears drive the output shaft with a phase difference of 180° to provide a balanced load.

RV-C is a two-stage reduction gear. The first reduction is the external meshing of the input gear and the first central gear, and then the external meshing of the second central gear and the spur gear. The three spur gears are symmetrical to the output shaft at intervals of 120°.

The second-stage reduction drives the eccentric shaft through the spur gear, and drives the RV gear mounted on the eccentric shaft, causing the eccentric movement of the two RV gears. The two RV gears drive the output shaft with a phase difference of 180° to provide a balanced load.

RV deceleration principle

Cylindrical needle rollers are installed in the inner ring of the housing. The eccentric movement of the RV gear causes the needle to mesh and disengage from the cycloidal RV gear teeth, resulting in multiple sets of RV gear teeth meshing with the needle at the same time to improve the load capacity. Since the number of RV gears is one less than that of needle rollers, when the eccentric shaft rotates once, if the case is fixed, the RV gear and the input shaft will rotate by an angle of one tooth in the same direction.

The output end can be a shaft or a case. If the housing is fixed, the drive shaft is output, and the output is in the same direction. If the drive shaft is fixed and the housing is the output, the output direction is exactly the opposite. By replacing the fixed and output parts, different transmission ratios can be obtained.

If you need to purchase or consult, learn more about the precision cycloidal pinwheel RV gear reducer, please feel free to consult and contact sales@geniusrobotics.cn,

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