Why Is Gear Mechanism Manufactured with High Precision

The reason why gear mechanisms require high manufacturing precision is mainly because high-precision gear mechanisms can ensure the accuracy, smoothness, and durability of their transmission process. Here are several key factors that explain why gear mechanisms require high manufacturing precision:

1. Transmission accuracy

Geometric eccentricity and radial error: The radial error of gears is caused by the actual center of rotation of the gear blank not coinciding with its reference hole center. This error can cause radial displacement of the teeth of the cut gear, thereby affecting the transmission accuracy. High manufacturing precision can reduce this error and ensure precise alignment and meshing of gears during transmission.

The difference between the actual center line A and the theoretical center line AA of the gear inner hole is shown as coaxiality error. From a microscopic perspective, there are several situations. One is that the parallelism is slightly better and there is deviation at the same time. In this case, during operation, assuming the opponent is a theoretical gear, there will also be a staggered rhythm of more or less meshing backlash, and the frequency of this rhythm is the value of the rotational speed. Another type is that there is an angular deviation between A and AA, which will be described in detail below

Motion eccentricity and tangential error: The tangential error of a gear refers to the displacement of the actual tooth profile relative to the theoretical position along the circumferential direction. This type of error can also affect the accuracy of the transmission. A high-precision manufacturing process can reduce transmission errors in the transmission chain, decrease the deviation between the indexing worm gear and the center of rotation of the worktable, and thus reduce tangential errors.

2. Stability

Vibration and noise: Low precision gears are prone to vibration and noise during transmission, which not only affects the overall performance of the equipment, but may also cause damage to other components of the equipment. High precision gear mechanisms can ensure smooth transmission and reduce the generation of vibration and noise.

Dynamic balance: High precision gears will consider dynamic balance issues in the design and manufacturing process to reduce vibration and stress concentration caused by imbalance.

3. Durability

Wear and fatigue: Low precision gears are prone to uneven wear and fatigue cracks during transmission, which can affect their service life. High precision gear mechanisms can reduce the occurrence of these adverse factors and improve the durability of gears.

Materials and Heat Treatment: High precision gears typically use high-quality materials and undergo appropriate heat treatment processes to improve their hardness, wear resistance, and fatigue resistance.

4. Processing technology and equipment

Advanced machining technology: High precision gear mechanisms require advanced machining techniques such as precision CNC machining, grinding, etc. to ensure the dimensional and shape accuracy of the gears.

High precision machining equipment: The accuracy and stability of machine tools have a significant impact on the machining accuracy of gears. High precision machining equipment can ensure the stability and consistency of gears during the machining process.

In summary, the reason why gear mechanisms require high manufacturing precision is to ensure their transmission accuracy, smoothness, durability, as well as stability and consistency during the machining process. These factors work together to make high-precision gear mechanisms play a crucial role in mechanical transmission.