There are two main types of retarders widely used in joint robots: RV retarder and harmonic retarder. So, for these two reducer, which has the advantage? What are the principles, advantages and disadvantages of the two? Can they replace each other? Let's find out.

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Harmonic reducer is used for industrial robots with small loads, or several axes at the end of large robots, harmonic reducer for small robots are characterized by small size, light weight, large carrying capacity, high motion accuracy, and large single-stage transmission ratio.

The harmonic reducer is one of the harmonic transmission devices, and the harmonic transmission device includes an accelerator and a reducer. The main structure of harmonic reducer is rigid wheel, flexwheel, bearing and wave generator, all of which are indispensable. Among them, the number of teeth of the rigid wheel is slightly greater than the number of teeth of the flexible wheel.

RV reducer is often used in the robot joints with large torque, specifically the three joints of the leg waist and elbow, the load is large industrial robots, and the RV reducer is used in one, two and three axes. RV reducer compared with the harmonic reducer has higher fatigue strength, stiffness and life, the disadvantages of harmonic reducer also include, with the use of time growth, motion accuracy will be reduced, with the harmonic reducer light weight small size of the advantages of the opposite, RV reducer disadvantage is its heavy weight, large size.

Both are less tooth difference meshing, the difference is that a key gear in the harmonics is flexible, the need for repeated high-speed deformation, and therefore more vulnerable, so the bearing capacity and service life of the harmonic reducer compared with the RV reducer, the bearing capacity is low and the life is short. RV reducer is generally used cycloidal needle wheel, harmonic used before the involute tooth shape, and now some manufacturers use double circular arc tooth shape, which is more advanced than the involute.

Compared with the harmonic reducer, RV reducer is a new rise of transmission products, RV reducer is actually developed on the basis of the traditional needle and thread reducer, not only to overcome the shortcomings of the general needle pendulum transmission, but also has more advantages, such as long life, maintain stable accuracy, high efficiency, smooth transmission, small size, light weight, speed change ratio range.

For the question of whether the two can be replaced, there are actually two kinds of statements in general.

1. It can be replaced, but only some models can be replaced. The RV reducer we have mentioned earlier has much higher fatigue strength, rigidity and life than the harmonic drive commonly used in robots, and the precision of the return difference is stable, and the accuracy of the motion will be significantly reduced as the harmonic drive with the increase in the use of time. Therefore, many countries of high-precision robot transmission more RV reducer, so there is a development trend, RV reducer gradually began to replace the harmonic reducer in advanced robot transmission.

Harmonic reducer is characterized by light and small, in this respect, the planet and RV is difficult to do. Therefore, all kinds of reducers can only be replaced in a part of the case, but it is unrealistic to replace another product in a full range of products.

For the question of whether the two can be replaced, there are actually two kinds of statements in general.

These products do have an alternative relationship on some models, but these types of reducers can only be partially replaced. In most cases, various types of reducer are difficult to replace.

2, The second is that all kinds of reducer can not be replaced, only complementary.

The two types of reducer, RV and harmonic, are complementary, but they do not exclude the formation of local competition in some application areas after structural design optimization and manufacturing process breakthroughs.

This is the comparison of RV reducer and harmonic reducer, between the two can not be said to be completely can replace each other, and the function of each reducer and the advantages are very different, enterprises should integrate the use of robot joints and the different performance of the reducer, choose the reducer products more suitable for the development of enterprises.

The Working Principle and Advantages of RV Reducers

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RV reducers, also known as RV gears or cycloidal reducers, are a type of mechanical transmission device that has gained widespread use in various industrial applications due to their unique combination of performance characteristics. These reducers are known for their high precision, efficiency, and durability, making them a popular choice for precise motion control and power transmission. In this article, we will explore the working principle of RV reducers and discuss the advantages that make them stand out in the field of mechanical engineering.

Working Principle of RV Reducers

The core component of an RV reducer is the cycloidal gear system, which consists of a worm and a cycloidal gear. The worm is a screw-like component that meshes with the teeth of the cycloidal gear. The cycloidal gear is designed with a series of pockets or cycloids that are in constant contact with the worm&#;s threads.

As the worm rotates, it drives the cycloidal gear through a process known as rolling and sliding motion. The teeth of the worm engage with the cycloidal gear&#;s pockets, causing the gear to rotate. This unique mechanism allows for a high gear ratio to be achieved in a compact design, which is one of the key features of RV reducers.

The contact between the worm and the cycloidal gear is distributed over a large area, which results in smooth and quiet operation with minimal vibration. Additionally, the design of the cycloidal gear ensures that the load is evenly distributed across its teeth, leading to a longer service life and improved reliability.

Advantages of RV Reducers

1. High Precision and Torque Density: RV reducers offer a high gear ratio, which allows for precise control of speed and torque. This makes them ideal for applications that require fine-tuned motion control, such as robotics, CNC machines, and automated assembly lines.
2. Efficiency and Low Backlash: The design of the cycloidal gear system in RV reducers results in high transmission efficiency, typically above 90%. This, combined with minimal backlash, ensures that the output is consistent and accurate, which is critical for maintaining precision in motion control systems.
3. Compact Size and Lightweight: RV reducers are known for their compact size and lightweight design. This makes them easy to integrate into a wide range of machinery and equipment, where space constraints may be a limiting factor.
4. Low Noise and Vibration: The smooth rolling and sliding motion between the worm and the cycloidal gear results in low noise and vibration levels. This is particularly beneficial in applications where noise pollution is a concern or where smooth operation is required for the accuracy of the machinery.
5. Durability and Long Life: The materials used in the construction of RV reducers are chosen for their strength and durability. The even load distribution across the gear teeth and the low wear and tear associated with the rolling motion contribute to a longer service life, reducing the need for frequent maintenance and replacement.
6. Ease of Maintenance: RV reducers are designed with maintenance in mind. They typically require minimal lubrication and have accessible components, making it easy to perform routine checks and maintenance tasks.
7. Versatility: The robust design and high performance of RV reducers make them suitable for a wide range of applications, from light-duty automation tasks to heavy-duty industrial machinery. Their versatility allows them to be used in various industries, including automotive, aerospace, medical equipment, and more.

In conclusion, RV reducers are a reliable and efficient solution for precise motion control and power transmission in a variety of industrial applications. Their high precision, compact size, low noise, and durability make them an attractive choice for designers and engineers looking to optimize the performance of their machinery. As the demand for high-precision automation continues to grow, RV reducers are poised to play a significant role in the advancement of modern manufacturing and automation technologies.

From:fbreducer.com

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