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1 Reducer noise source analysis (1) Gear parameters and structural design impact on noise When a pair of gears are driven, the greater the coincidence, the lower the noise, and the smaller the coincidence, the higher the noise.
The degree of coincidence indicates the average value of the number of gear teeth participating in the meshing at the same time, increasing the coincidence degree of the gear transmission, which means that the number of gear teeth participating in the meshing is increased at the same time, which improves the stability of the gear transmission, reduces noise and improves Carrying capacity is very important. In addition, the interference between the inner bore of the gear and the outer ring of the bearing and the axial clearance of the bearing are unreasonable.
(2) Gear accuracy grade is an important indicator of noise level. For a standard series reducer, the manufacturing accuracy of the gear determines its noise value. The higher the accuracy of the gear, the denser the contact surface of the meshing tooth surface, the contact marks on the entire tooth surface, and the lower the noise. On the contrary, the lower the gear precision is, the smaller the contact surface of the meshing tooth surface is, and the gear is not completely meshed in the contact width thereof, the operation is not stable, and even the impact is generated, so that the noise value is increased.
(3) Impact and noise generated by pitting on the tooth surface After a certain period of operation, the gear is often detached near the tooth surface line, forming pitting, ie pitting. Because the hardened gear has the advantages of large bearing capacity, small volume, light weight, good transmission quality, etc., it is widely used. Although the hard surface gear is not easy to pitting, once the pitting occurs, it is not easy to run, and the pitting of the tooth surface will be As the working time increases, it expands rapidly and develops into an extended pitting, which destroys the tooth shapes and increases the working noise and impact. The metal debris that is dropped by the impact accelerates the wear of the tooth surface, thereby causing the gear transmission to be unstable and generating noise.
(4) The gear machining error causes the noise of the gear gear to cause the noise mainly due to the cumulative error of the pitch and the tooth profile error.
The cumulative pitch error is due to the non-uniform gear tooth thickness caused by the rotation axis of the tooth blank when the tooth is made and the rotation axis of the gear when it is working. The tooth profile error is mainly caused by the error of the hob in the manufacturing, sharpening and installation, which causes the tooth surface to be edged, the tooth shape is asymmetrical, the undercut and the subsequent machining correction are insufficient, the gear transmission is not stable, and the pulsation, undercut and hitting occur. The tooth phenomenon in turn produces noise.
(5) The inner ring gear and the carrier machining error cause the noise inner ring ring runout error to have the greatest influence on the floating amount of the floating member, so the radial runout of the inner ring gear should be strictly controlled. Due to the improper selection of the internal ring gear due to the processing and heat treatment process, the parameters such as tooth shape, tooth direction and pitch change after heat treatment are also one of the important causes of noise. During the processing of the planetary carrier, the deviation of the position of the planetary axle directly affects the backlash of the gear pair. The necessary side clearance is very important to ensure the normal operation, lubrication, thermal expansion and contraction of the reducer, but the backlash is too large. The reverse conversion produces an impact when it is generated to generate noise.
(6) The elastic deformation of the heavy-duty gear transmission tooth surface results in noise heavy-duty gears, especially hard-toothed gears, which have large elastic deformation and poor running performance. The gears are subjected to the impact of the load and the impact of the gears.
(7) The assembly error causes the geometric accuracy of the noise assembly to fail to meet the design requirements, resulting in vibration of the transmission system, or the looseness of the individual components during assembly, resulting in inaccurate system positioning, meshing in an abnormal position, and shaft movement Vibration and noise.
(8) Improper maintenance of the whole machine leads to tooth surface wear when the noise gear meshes. In the long-term use of the reducer, if the lubrication and cooling are insufficient, the cleanliness of the lubricating oil will be poor, which will accelerate the wear. When the wear is severe, the accuracy of the gear is damaged and the noise of the reducer increases.
2 Measures to reduce the noise of the reducer These noises are related to the design, manufacture, assembly accuracy and maintenance of the whole machine.
Therefore, it should be controlled from the following aspects:
(1) Improve the gear parameters: increase the gear coincidence to improve the smoothness of the gear transmission. The coincidence degree is proportional to the number of teeth and the height of the tooth tip, and is inversely proportional to the meshing angle. Therefore, it can be reduced by increasing the number of gears, increasing the displacement coefficient, and reducing the tooth profile angle of the main and passive gears. The teeth bite and bite the impact, thereby reducing gear transmission noise.
(2) For medium and low speed grades and more important gears, the tooth direction modification (see 1) and the tooth top profile modification are generally adopted. The function of the gear is to make the bearing area of ​​the gear in the middle of the tooth working surface to avoid the tooth end. The bending stress of the heavy-duty root is multiplied and broken, and the bearing is smoothly engaged to improve the smoothness of the transmission and reduce the noise.
3 Ending the noise reduction of the reducer is due to the effective control of the design, manufacturing process, assembly quality and maintenance factors of the main components. Optimizing the structure and parameter design, improving manufacturing precision and improving assembly quality are effective ways to reduce the noise of the reducer.
CAS:
Element: V, Nb, Al, C
Purity: by X-ray result
Molecular Weight: 182.84
Apparent Density (g/cm3): ---
Storage: dry seal preservation below 50 ℃.
Do not use if cap seal is broken.
Keep out of reach of children.
This product should be stored in room temperature and dry place, avoid contact with acid, alkali and other liquids, long-term storage will happen slow oxidation.
Test method:
This product can be confirmed by X-ray powder diffractometer crystal results; Element composition was confirmed by energy dispersive X-ray detector. The same morphology characterization was used to characterize the particle morphology. The particle size distribution was evaluated by laser particle size analyzer.
Safety protection:
1. Health hazards
Hazardous category: Non-hazardous chemical chemical category: ceramic powder;
Route of invasion: inhalation, ingestion;
Health hazards: dust in the eye has irritation, oral stimulation of gastrointestinal tract;
2. First aid measures
Skin contact: Remove contaminated clothing and rinse skin thoroughly with running water.
Eye contact: lift eyelid and rinse with plenty of running water or normal saline for at least 15 minutes;
Inhalation: Get away from the scene to fresh air quickly;
Ingestion: drink enough warm boiled water, induce vomiting, seek medical advice;
3. Ignition and explosion characteristics and fire protection
Flammability: non-flammable;
Column-type star gear builder reduces noise analysis