Meshing Deviation and Correction Methodology of Spur Gear in Gear Machining
Introduction
In gear machining, the meshing of toothed gear refers to the state of contact between the tooth surfaces of two gears, which is of great significance to the smooth transmission of power. Meshing deviation is an important indicator in the design, processing and assembly process of the gear. The deviation will affect the accuracy and meshing quality of the gear. This article will discuss the types, causes, effects and corrections methods of meshing deviation in gear machining.
Types of Meshing Deviations
Meshing deviation can be classified into two types: profiles and pitch deviations. Profile deviation refers to the fact that the tooth shape of one gear does not perfectly match the tooth shape of the pair gear, thereby causing deviation. Pitch deviation refers to the fact that the shaped teeth dont rotate into the same position each time, which causes the contact point of the two teeth pair to deviate.
Causes of Meshing Deviations
Profile Deviation
1. Wheel blank machining error: The machining error of gear blank due to the machining accuracy of gear grinding machine is one of the main causes of profile deviation.
2. Rack and pinion profile replacement error: The profile matching error of the gear and the pinion affects the meshing precision of the gear.
3. Profile correction error: The profile correction error will also cause meshing inaccuracy. The profile correction error may be caused by two reasons:
a. The correction method used is unreasonable.
b. The correction action is not performed correctly.
Pitch Deviation
1. Tooth Pitch error: The problem of inaccurate tooth pitch is one of the main causes of pitch deviation.
2. Rack and Pinion Tooth Pitch Error: The tooth pitch error of the gear and the pinion affects the meshing precision of the gear.
3. Accumulation of Errors: Even if the tooth shape and tooth pitch errors of the gears are within the allowable range, the accumulation of errors will still cause a large amount of pitch deviation.
Effects of Meshing Deviations
Meshing deviation will cause the following problems:
1. Poor Contact Quality: Meshing deviation will cause poor contact between gears, which will cause excessive wear, noise, vibration and reduce transmission efficiency.
2. Inaccurate Meshing: Accurate meshing is necessary for the smooth transmission of power and torque. Meshing deviation can cause inaccurate meshing, causing the gear system to malfunction or run inefficiently.
3. Poor Appearance: Meshing deviation can cause poor profile accuracy, reducing the overall appearance of the gear system.
Correction Methods of Meshing Deviations
1. Profile Deviation
Profile deviation can be corrected by the following methods:
a. Wheel grinding: The gear grinding machine is used to correct the profile shape of the gear, which can achieve a high precision correction effect.
b. Gear lapping: Gear lapping machine is used to correct the profile shape of the gear.
2. Pitch Deviation
Pitch deviation can be corrected by the following methods:
a. Tooth shaving: Tooth shaving can be used to correct the tooth pitch error of the gear.
b. Tooth grinding and lapping: Tooth grinding and lapping can be used to correct the tooth pitch errors of the gear, which can achieve high precision correction.
Conclusion
At present, meshing deviation of toothed gears has become a major problem in gear machining. It is necessary to strictly control the accuracy of gear manufacturing and assembly in order to ensure meshing accuracy. The article has introduced the types, causes and effects of meshing deviation in gear machining, as well as the corresponding correction methods.
