Cycloidal pinwheel reducer
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What is the code for cycloidal reducers in SEW? Or is there none? I only know that SEW has four main series: R, S, K, and F, as well as a larger M series. Today I suddenly realized that SEW does not have any models with cycloidal gears; are SEW’s cycloidal gear models referred to by some other name?
SEW has planetary gear reducers, but it seems they don’t have cycloidal pinwheel reducers.
Hehe, I asked someone today – they said that cycloidal technology is associated with reducers from the 1980s; their characteristic is being bulky and heavy. SEW series products, on the other hand, are lightweight and have high torque, and they will gradually replace cycloidal reducers, although they are relatively more expensive.
Principle of cycloidal pinwheel reducer: A cycloidal pinwheel reducer is a novel transmission device that utilizes the planetary transmission principle and features the engagement of cycloidal pin teeth. The entire transmission mechanism of a cycloidal pinwheel reducer can be divided into three parts: the input part, the reduction part, and the output part. An eccentric sleeve displaced by 180° is mounted on the input shaft; two roller bearings known as swivel arms are attached to this eccentric sleeve, forming an H-shaped mechanism. The central holes of the two cycloidal gears serve as the raceways for the bearings on the eccentric sleeve’s swivel arms. The cycloidal gears engage with a set of ring-shaped pin teeth on the pin gear, thereby creating an internal gear reduction mechanism with a tooth difference of one tooth. (To reduce friction, in reducers with a low gear ratio, the pin teeth are equipped with pin tooth sleeves.) When the input shaft rotates one full circle with the eccentric sleeve, due to the characteristics of the tooth profile curve on the cycloid wheel and the restriction imposed by the teeth on the pin gear, the motion of the cycloid wheel becomes a planar motion that involves both revolution and rotation. As the input shaft rotates one full circle in the forward direction, the eccentric sleeve also rotates one full circle; the cycloid wheel then rotates one tooth in the opposite direction, resulting in deceleration. Through the W-output mechanism, the low-speed rotational motion of the cycloid wheel is transmitted to the output shaft via the pin, thereby yielding a lower output speed.
Cycloidal pinwheel reducers have the advantages of a high reduction ratio and a small size.
There are now good manufacturers in China that produce reducers in the SEW style; they can be considered for trial use in less critical applications.
Well, companies like Zhejiang Tongli and Jiepai are imitating SEW; a few days ago, a sales representative from Hangzhou Jiepai came to me to discuss becoming an agent and helping to acquire customers
We should support domestic products. However, it’s really inconvenient to switch from the original cycloidal gears to other types; it requires a lot of work