Dual and single support in planetary reducer

The planetary gear reducer dual support and the planetary gear reducer single support, what do they mean? Now, let's explain it for you.

1. The significance of the dual support of the planetary gear reducer and the single support of the planetary gear reducer

The dual support and single support of the planetary gear reducer refer to the gear support, that is, the planetary frame of the planetary gear reducer. The single support structure refers to the gear on the planetary frame being supported on only one side, while the dual support structure means the gear on the planetary frame is supported on both sides.

2. Structure of the dual support and single support of the planetary gear reducer

Dual support structure: The planetary gear frame of the planetary gear reducer passes through the CNC cavity, then drills sub-holes in the upper machining center. It must also ensure that the pin holes on the upper and lower surfaces are completely concentric (otherwise, the gears will not mesh), then it is placed in the gear and finally fixed by dowel pins. The gears are supported on both sides by the planetary frame.

Single support structure: Three pin holes are drilled on the planetary frame, and three pins are placed on the planetary frame, and the gear is fixed on the pins. One side of the gear is the planetary gear frame, and the other side is suspended. A cover is placed behind the gear frame to separate the gear.

3. Performance of dual support and single support of the planetary gear reducer

The dual support servo planetary gear reducer has two support points. Its bearings and brackets are integrated, and each pin hole corresponds to the upper and lower sides, which must be accurate and completely concentric, without any deviation. The gears on the planetary gear frame are supported on both sides, ensuring the stability and precision of the planetary gear reducer, even under high torque.

A single support only has one support point, and the gear on the planetary frame has only one force side. When the single support reducer is under load, the gear will lean towards the other side. Over time, this can lead to increased noise, gear deformation, accelerated wear, shortened lifespan, and many other drawbacks.

When the output shaft of the planetary gear reducer is loaded, the gear of the single support planetary gear reducer will move in the opposite direction of the output shaft, increasing the friction coefficient between the planetary gear and the planetary ring. However, the result is increased noise, reduced efficiency, higher temperature, and even serious oil leakage.

In addition, planetary gear reducers are mainly used to match servo motors. We all know that servo motors are characterized by small size, high precision, and frequent forward and reverse rotation. When the single support planetary gear reducer is used with a servo motor for frequent back and forth rotation, the gear pins on the planetary frame are prone to rigid deformation, resulting in larger clearances in the single support planetary gear.

4. Cost of dual support and single support planetary gear reducers

The planetary frame of the planetary gear reducer and the output shaft of the planetary gear reducer are integrated structures, so the good performance of the planetary frame directly affects the performance of the planetary gear reducer in various aspects. The planetary frame of the dual/single support planetary gear reducer and the output shaft of the planetary gear reducer are integrated structures.

The single support planetary frame only needs three gear pin holes on the planetary frame. In contrast, the dual support planetary frame in front of the gear pin holes also needs to use a CNC cavity in the middle of the planetary frame, and then punch holes in the machining center. The dual support structure involves a more complex process than the single support structure.

For the single support planetary gear frame, holes only need to be drilled on one side. It can be said that the drilling can be done freely, and even if there is a deviation, it will not be scrapped. It can be drilled at a 30-degree angle. Frankly, who knows how many holes the planetary gear frame will drill inside the product, and it will not have any adverse effects on the product.

The dual support structure is completely different. Firstly, the middle of the planetary frame and the CNC are empty, and then the holes are punched on the processing center. It is also necessary to ensure that the pin holes on the upper and lower sides are completely concentric, and it is a completely different concept to punch holes on both sides to ensure homogeneity. Once a hole is missed, the entire planetary frame will be scrapped. Therefore, the cost of the planetary frame material, especially the processing cost, is about 20% higher than the cost of the entire machine.