Gear box noise reduction method

Abstract

The invention belongs to the technical field of gear noise reduction, and discloses a gearbox noise reduction method which comprises the following steps: S1, optimizing the structural design of a gearbox; s2, optimizing a gear transmission and lubrication system; s3, gear material selection; s4, optimizing operation and maintenance management; and S5, a noise monitoring and feedback system. By accurately controlling the meshing clearance of the gear, the thermal expansion requirement during working is met, noise caused by too large or too small clearance is avoided, meanwhile, the synthetic lubricating oil with moderate viscosity, low foaming property and high oxidation resistance is selected, good lubrication of the gear is ensured, the service life of the lubricating oil is prolonged, and the service life of the gear is prolonged. The design of the lubricating oil circulating system also fully considers the uniform distribution of oil flow and the smoothness of the oil pipe, avoids the formation of bubbles in the oil pipe, further improves the lubricating effect, and the optimization measures not only reduce the noise in the gear transmission process, but also improve the transmission efficiency and stability of the gear box.

Description

Technical Field

[0001] The invention belongs to the technical field of gear noise reduction, and in particular relates to a gear box noise reduction method. Background Art

[0002] A gearbox is a mechanical device used to transmit power and speed, and is composed of multiple gears. Its main function is to change the speed and torque of the input shaft to adapt it to different working requirements. Through the meshing and rotation of the gears, the gearbox can achieve power transmission and conversion. The gearbox is usually composed of input shafts, output shafts, gears, bearings and other components. In addition, it also includes auxiliary components such as locking plates, lubrication and cooling systems, heaters, air filters, etc. These components work together to ensure the normal operation and efficient transmission of the gearbox.

[0003] Gearbox noise refers to abnormal sounds caused by various factors during the operation of the gearbox. This noise not only affects the smooth operation of the equipment, but may also be a precursor to potential failures. The main reasons for gearbox noise are gear wear or damage, bearing problems, poor gear meshing, lubricating oil problems, assembly errors and external factors. Various factors lead to certain abnormal noises in the gearbox, which urgently need to be improved. Summary of the invention

[0004] The object of the present invention is to provide a gearbox noise reduction method to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a gearbox noise reduction method, comprising the following steps:

[0006] S1: Optimize gearbox structure design;

[0007] S2: Optimize gear transmission and lubrication system;

[0008] S3: Gear material selection;

[0009] S4: Optimize operation and maintenance management;

[0010] S5: Noise monitoring and feedback system;

[0011] The optimized gearbox structure design includes gear meshing accuracy, optimized gearbox housing structure, and vibration reduction support system design; the optimized gear transmission and lubrication system includes gear meshing clearance optimization, selection of low-noise lubricating oil, and lubricating oil system design; the gear material selection includes selection of gear materials and gear surface treatment; the optimized operation and maintenance management includes installation accuracy control, load control and operation specifications, regular maintenance and inspection; the noise monitoring and feedback system includes noise monitoring equipment, data feedback and analysis.

[0012] As a further technical solution of the present invention, the improvement of gear meshing accuracy includes controlling the gear pitch error within ±0.02mm, the shaping error not exceeding 0.05mm, using involute gears, and setting the pressure angle to 20° to ensure smooth meshing and reduce impact noise. Using involute gears, the pressure angle is set to 20° to ensure smooth meshing and reduce impact noise. High-precision CNC milling machines are used to ensure that the meshing accuracy of the gears in the entire gearbox is consistent. The optimized gearbox housing structure includes the housing made of A356 aluminum alloy with a tensile strength of 280MPa and good vibration reduction performance. The housing wall thickness is controlled between 8mm and 12mm, and reinforcing ribs are designed to avoid resonance. The vibration mode needs to be analyzed by finite element analysis to ensure that there is no low-frequency resonance. A 5mm thick polyurethane foam material is coated on the inner wall of the gearbox housing, and a 5mm thick rubber sound insulation board is installed to improve the sound absorption effect. The vibration reduction support system design includes the support system using a hardness of 40Shore A's high elastic rubber gasket has a maximum vibration absorption frequency of 50Hz, which effectively absorbs high-frequency vibrations. The vibration-damping material is arranged on the contact surface between the gearbox and the equipment base to ensure effective isolation of the gearbox vibration transmission.

[0013] As a further technical solution of the present invention, the gear meshing clearance optimization includes controlling the gear meshing clearance between 0.1mm and 0.15mm to meet the thermal expansion during operation, and keeping the operating temperature below 90°C to avoid excessive temperature affecting the meshing clearance and generating noise.

[0014] As a further technical solution of the present invention, the selection of the low-noise lubricating oil includes the use of a synthetic lubricating oil with a viscosity of ISO VG320, which has low foaming and high oxidation resistance and is suitable for high-load and high-speed environments. The lubricating oil replacement cycle does not exceed 6000 hours, and the metal impurities in the oil are checked regularly to ensure the lubrication effect. The design of the lubricating oil circulation system includes the use of a quantitative oil pump, the oil flow rate must meet an oil circulation volume of 50L per minute, ensuring that the oil flow is evenly distributed, and the inner diameter of the oil pipe is not less than 15mm to ensure smooth oil flow and avoid the formation of bubbles in the oil pipe.

[0015] As a further technical solution of the present invention, the selected gear material includes 15CrNi6 high alloy steel, the hardness of which can reach HRC 58-60, with high wear resistance and reduced noise generation. The gear surface treatment includes nitriding the gear, the thickness of the nitriding layer is controlled at 0.3mm to 0.5mm, and the hardness reaches above HV 800, which reduces wear and friction noise. The gear is shot peened using 0.6mm steel shot with a spray pressure of 3.5MPa. After shot peening, the surface roughness of the gear reaches Ra≤0.2μm, effectively reducing friction.

[0016] As a further technical solution of the present invention, the installation accuracy control includes controlling the centering accuracy of the gear shaft and the gear box within 0.05mm during installation to avoid uneven meshing due to eccentricity, and using a laser alignment instrument to perform accuracy inspection to ensure that the centering error between the gear box and the drive shaft does not exceed 0.05mm. The load control and operating specifications include ensuring that the gear box operates under rated load, the maximum load does not exceed 120% of the rated load, and the operating speed is controlled within ±5% of the design speed to avoid noise caused by overspeeding.

[0017] As a further technical solution of the present invention, the regular maintenance and inspection includes formulating a semi-annual inspection plan according to the working environment, checking the degree of gear wear and the quality of lubricating oil, and regularly conducting vibration and noise tests to ensure that the equipment is in the best working condition.

[0018] As a further technical solution of the present invention, the noise monitoring equipment includes a high-precision noise monitoring instrument installed near the gearbox, the monitoring range covers 40dB(A) to 100dB(A), the resolution is 0.1dB, when the noise exceeds 80dB(A), the system automatically triggers an alarm and notifies maintenance personnel to conduct an inspection, the data feedback and analysis includes uploading real-time noise data to the central control system through sensors, performing data analysis, finding the source of noise and making adjustments, using a spectrum analyzer to perform frequency domain analysis on the noise, identifying the main noise frequency bands and taking corresponding adjustment measures.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) The present invention adopts A356 aluminum alloy material with high strength and excellent vibration reduction performance, combined with reasonable wall thickness design and reinforcement rib arrangement, to effectively avoid the occurrence of resonance phenomenon. At the same time, by coating polyurethane foam material and installing rubber sound insulation board, the sound absorption effect of the gearbox is further improved. In addition, the design of the vibration reduction support system also fully considers the absorption of high-frequency vibration, ensuring the effective isolation of the vibration transmission of the gearbox. Under the joint action of these measures, the noise level during the operation of the gearbox is significantly reduced, and the overall performance of the equipment is improved. By accurately controlling the meshing clearance of the gears, the thermal expansion requirements during operation are met, and the noise caused by excessive or too small clearance is avoided. At the same time, the selection of synthetic lubricating oil with moderate viscosity, low foaming and strong antioxidant properties not only ensures good lubrication of the gears, but also extends the service life of the lubricating oil. The design of the lubricating oil circulation system also fully considers the uniform distribution of the oil flow and the smoothness of the oil pipe, avoiding the formation of bubbles in the oil pipe, and further improving the lubrication effect. These optimization measures not only reduce the noise during the gear transmission process, but also improve the transmission efficiency and stability of the gearbox.

[0021] (2) The present invention adopts 15CrNi6 high alloy steel with high hardness and strong wear resistance, and further improves the wear resistance and noise reduction performance of the gear through nitriding and shot peening. These measures not only extend the service life of the gear, but also significantly reduce the noise generated by gear wear. By accurately controlling the centering accuracy of the gear shaft and the gear box, the problem of uneven meshing caused by eccentricity is avoided. At the same time, the gear box is ensured to work under the rated load and the operating speed is strictly controlled to avoid additional noise generated by overspeed operation. In addition, regular maintenance and inspection plans also ensure that the gear box is always in the best working state, and potential problems are discovered and solved in time. By installing high-precision noise monitoring instruments and real-time data analysis systems, accurate monitoring and rapid response to gear box noise are achieved. When the noise exceeds the preset threshold, the system will automatically trigger an alarm to notify the maintenance personnel to conduct an inspection. At the same time, the frequency domain analysis of the noise by the spectrum analyzer can accurately identify the main noise frequency band, which provides a scientific basis for taking targeted adjustment measures. These measures not only improve the efficiency and accuracy of noise control, but also provide a strong guarantee for the long-term stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall process of the present invention;

[0023] Figure 2 A schematic diagram of the process of optimizing the gearbox structure design of the present invention;

[0024] Figure 3 A schematic diagram of the process flow of optimizing the gear transmission and lubrication system of the present invention;

[0025] Figure 4 A schematic diagram of the process for selecting gear materials of the present invention;

[0026] Figure 5 A schematic diagram of the process flow for optimizing operation and maintenance management of the present invention;

[0027] Figure 6 It is a schematic diagram of the flow of the noise monitoring and feedback system of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 6 As shown, in an embodiment of the present invention, a gear box noise reduction method includes the following steps:

[0030] S1: Optimize gearbox structure design;

[0031] S2: Optimize gear transmission and lubrication system;

[0032] S3: Gear material selection;

[0033] S4: Optimize operation and maintenance management;

[0034] S5: Noise monitoring and feedback system;

[0035] Optimizing the gearbox structure design includes gear meshing accuracy, optimizing the gearbox housing structure, and designing the vibration reduction support system. Optimizing the gear transmission and lubrication system includes optimizing the gear meshing clearance, selecting low-noise lubricants, and designing the lubricating oil system. Gear material selection includes selecting gear materials and gear surface treatment. Optimizing operation and maintenance management includes installation accuracy control, load control and operating specifications, regular maintenance and inspection. The noise monitoring and feedback system includes noise monitoring equipment, data feedback and analysis.

[0036] Through comprehensive and meticulous measures, the quietness of the gearbox has been significantly improved. From the optimization of structural design to the improvement of transmission and lubrication systems, to the selection of materials and the refined management of operation and maintenance, each step is aimed at reducing the generation and spread of noise. In particular, the precise control of gear meshing, the optimization of housing structure and vibration reduction design, and the selection of low-noise lubricants have effectively reduced operating noise. At the same time, the introduction of a noise monitoring and feedback system has achieved real-time monitoring and data analysis of noise levels, providing strong support for continuous optimization.

[0037] Among them, improving the gear meshing accuracy includes controlling the gear pitch error within ±0.02mm, the shaping error does not exceed 0.05mm, using involute gears, and setting the pressure angle to 20° to ensure smooth meshing and reduce impact noise. Using involute gears, the pressure angle is set to 20° to ensure smooth meshing and reduce impact noise. Using high-precision CNC milling machines to ensure consistent gear meshing accuracy throughout the gearbox, optimizing the gearbox housing structure, including using A356 aluminum alloy for the housing, with a tensile strength of 280MPa and good vibration reduction performance, controlling the housing wall thickness between 8mm and 12mm, designing reinforcement ribs to avoid resonance, and the vibration mode needs to be analyzed by finite element analysis to ensure that there is no low-frequency resonance. Coating the inner wall of the gearbox housing with a 5mm thick polyurethane foam material and installing a 5mm thick rubber sound insulation board to improve the sound absorption effect. The vibration reduction support system design includes using a support system with a hardness of 40Shore A's high elastic rubber gasket has a maximum vibration absorption frequency of 50Hz, which effectively absorbs high-frequency vibrations. The vibration-damping material is arranged on the contact surface between the gearbox and the equipment base to ensure effective isolation of the gearbox vibration transmission.

[0038] Through the above measures, the gear meshing accuracy has been greatly improved, the pitch error and the modification error have been strictly controlled within a reasonable range, and the setting of the involute gear and the 20° pressure angle ensures the smoothness of the meshing process and reduces the impact noise. The gearbox housing structure has been optimized, using the A365 aluminum alloy with high strength and excellent vibration reduction performance, and effectively avoiding the resonance phenomenon through wall thickness control, rib design and finite element analysis. The inner wall is coated with polyurethane foam and the rubber sound insulation board is installed to further enhance the sound absorption effect. In addition, the design of the vibration reduction support system effectively isolates the vibration transmission of the gearbox, and the overall noise reduction effect is significant.

[0039] Among them, the optimization of gear meshing clearance includes controlling the gear meshing clearance between 0.1mm and 0.15mm to meet the thermal expansion during operation, and keeping the operating temperature below 90°C to avoid excessive temperature affecting the meshing clearance and generating noise.

[0040] By precisely controlling the meshing clearance of the gears within the range of 0.1mm to 0.15mm, it not only ensures that the gears can adapt to the needs of thermal expansion during operation, but also significantly improves the stability and efficiency of the gear transmission. At the same time, maintaining the operating temperature within a reasonable range below 90°C effectively avoids the change in meshing clearance caused by excessive temperature, thereby reducing the generation of noise. This optimization strategy not only extends the service life of the gears, but also significantly improves the quietness and operational reliability of the entire gearbox.

[0041] Among them, the selection of low-noise lubricants includes the use of synthetic lubricants with a viscosity of ISO VG 320, which has low foaming and high oxidation resistance and is suitable for high-load and high-speed environments. The lubricant replacement cycle does not exceed 6,000 hours. Metal impurities in the oil are checked regularly to ensure the lubrication effect. The design of the lubricant circulation system includes the use of a quantitative oil pump. The oil flow rate must meet the oil circulation volume of 50L per minute to ensure that the oil flow is evenly distributed. The inner diameter of the oil pipe is not less than 15mm to ensure smooth oil flow and avoid the formation of bubbles in the oil pipe.

[0042] The ISO VG 320 synthetic lubricant with moderate viscosity, low foaming and strong oxidation resistance provides excellent lubrication performance for gears under high load and high speed environment, significantly reducing operating noise. Regularly changing the lubricant and checking the metal impurities in the oil ensures the lasting and stable lubrication effect. At the same time, the carefully designed lubricant circulation system ensures the uniform distribution and unobstructed flow of oil through a quantitative oil pump and sufficient oil flow, effectively avoiding the formation of bubbles in the oil pipe, and further improving the lubrication efficiency and the overall performance of the gearbox.

[0043] Among them, the selected gear materials include 15CrNi6 high alloy steel with a hardness of HRC 58-60, high wear resistance and reduced noise generation. The gear surface treatment includes nitriding of the gear. The thickness of the nitriding layer is controlled at 0.3mm to 0.5mm, and the hardness reaches above HV 800, which reduces wear and friction noise. The gear is shot peened with 0.6mm steel shot and a spray pressure of 3.5MPa. After shot peening, the surface roughness of the gear reaches Ra≤0.2μm, effectively reducing friction.

[0044] The use of 15CrNi6 high alloy steel as the gear material significantly reduces noise generation due to its excellent hardness and wear resistance. The gear surface is nitrided to form a nitrided layer with moderate thickness and extremely high hardness, which further reduces wear and friction noise. In addition, shot peening effectively improves the roughness of the gear surface and reduces friction through fine process parameters, thereby improving the quietness and operating efficiency of the gear.

[0045] Among them, installation accuracy control includes controlling the centering accuracy of the gear shaft and the gear box within 0.05mm during installation to avoid uneven meshing due to eccentricity, and using a laser alignment instrument for accuracy inspection to ensure that the centering error between the gear box and the drive shaft does not exceed 0.05mm. Load control and operating specifications include ensuring that the gear box works under rated load, the maximum load does not exceed 120% of the rated load, and the operating speed is controlled within ±5% of the design speed to avoid noise caused by overspeeding.

[0046] By strictly controlling the centering accuracy of the gear shaft and the gearbox, and using a laser centering instrument for precise calibration, the uniformity of the gear meshing is ensured, effectively avoiding noise problems caused by eccentricity. At the same time, the load and operating speed are reasonably controlled to ensure that the gearbox works stably within the rated load range and avoid additional noise caused by overload or overspeed. These measures work together to not only significantly improve the running stability of the gearbox, but also effectively reduce the noise level.

[0047] Among them, regular maintenance and inspection include formulating a semi-annual inspection plan based on the working environment, checking the degree of gear wear and the quality of lubricating oil, and conducting regular vibration and noise tests to ensure that the equipment is in the best working condition.

[0048] By implementing a regular maintenance and inspection system, the gearbox is fully inspected every six months, effectively monitoring the wear of the gears and the quality of the lubricating oil, ensuring the good condition of the internal components of the gearbox. Vibration and noise tests are performed regularly to promptly discover and solve potential problems, prevent failures, and maintain the best working condition of the equipment.

[0049] Among them, the noise monitoring equipment includes high-precision noise monitoring instruments installed near the gearbox. The monitoring range covers 40dB(A) to 100dB(A) with a resolution of 0.1dB. When the noise exceeds 80dB(A), the system automatically triggers an alarm and notifies maintenance personnel to conduct inspections. Data feedback and analysis include uploading real-time noise data to the central control system through sensors, performing data analysis, finding the source of noise and making adjustments, and using a spectrum analyzer to perform frequency domain analysis on the noise, identify the main noise frequency bands and take corresponding adjustment measures.

[0050] By installing high-precision noise monitoring equipment, accurate monitoring of noise near the gearbox is achieved, covering a wide range of noise and capturing noise changes with extremely high resolution. When the noise exceeds the preset threshold, the system will immediately alarm and respond quickly to maintenance needs. Real-time noise data is uploaded to the central system, and through in-depth analysis, the source of noise is accurately located. Combined with the frequency domain analysis of the spectrum analyzer, the main noise frequency bands are effectively identified, providing a scientific basis for taking targeted adjustment measures, significantly improving the efficiency and accuracy of noise control, and ensuring a low-noise environment for the operation of the gearbox.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gear box noise reduction method, comprising the following steps: S1: Optimize gearbox structure design; S2: Optimize gear transmission and lubrication system; S3: Gear material selection; S4: Optimize operation and maintenance management; S5: Noise monitoring and feedback system; The optimized gearbox structure design includes gear meshing accuracy, optimized gearbox housing structure, and vibration reduction support system design; the optimized gear transmission and lubrication system includes gear meshing clearance optimization, selection of low-noise lubricating oil, and lubricating oil system design; the gear material selection includes selection of gear materials and gear surface treatment; the optimized operation and maintenance management includes installation accuracy control, load control and operation specifications, regular maintenance and inspection; the noise monitoring and feedback system includes noise monitoring equipment, data feedback and analysis.

2. A gear box noise reduction method according to claim 1, characterized in that: The improvement of gear meshing accuracy includes controlling the gear pitch error within ±0.02mm, the shaping error not exceeding 0.05mm, using involute gears, setting the pressure angle to 20°, ensuring smooth meshing and reducing impact noise, using involute gears, setting the pressure angle to 20°, ensuring smooth meshing and reducing impact noise, using high-precision CNC milling machines to ensure consistent gear meshing accuracy throughout the gearbox, and optimizing the gearbox housing structure. The housing is made of A356 aluminum alloy with a tensile strength of 280MPa and good vibration reduction performance. The housing wall thickness is controlled between 8mm and 12mm, and reinforcing ribs are designed to avoid resonance. The vibration mode needs to be analyzed by finite element analysis to ensure that there is no low-frequency resonance. The inner wall of the gearbox housing is coated with 5mm thick polyurethane foam material, and a 5mm thick rubber sound insulation board is installed to improve the sound absorption effect. The vibration reduction support system design includes the support system using a hardness of 40Shore A's high elastic rubber gasket has a maximum vibration absorption frequency of 50Hz, which effectively absorbs high-frequency vibrations. The vibration-damping material is arranged on the contact surface between the gearbox and the equipment base to ensure effective isolation of the gearbox vibration transmission.

3. A gear box noise reduction method according to claim 1, characterized in that: The gear meshing clearance optimization includes controlling the gear meshing clearance between 0.1 mm and 0.15 mm to meet the thermal expansion during operation, and maintaining the operating temperature below 90° C. to avoid excessive temperature affecting the meshing clearance and generating noise.

4. A gear box noise reduction method according to claim 1, characterized in that: The selection of the low-noise lubricant includes the use of a synthetic lubricant with a viscosity of ISO VG 320, which has low foaming and high oxidation resistance and is suitable for high-load and high-speed environments. The lubricant replacement cycle does not exceed 6,000 hours, and metal impurities in the oil are checked regularly to ensure the lubrication effect. The design of the lubricant circulation system includes the use of a quantitative oil pump, and the oil flow rate must meet an oil circulation volume of 50L per minute to ensure uniform distribution of the oil flow. The inner diameter of the oil pipe is not less than 15mm to ensure smooth oil flow and avoid the formation of bubbles in the oil pipe.

5. A gear box noise reduction method according to claim 1, characterized in that: The selected gear materials include 15CrNi6 high alloy steel with a hardness of HRC 58-60, high wear resistance and reduced noise generation. The gear surface treatment includes nitriding the gear, with the thickness of the nitriding layer controlled at 0.3mm to 0.5mm and a hardness of HV800 or above, reducing wear and friction noise. The gears are shot peened using 0.6mm steel shots with a spray pressure of 3.5MPa. After shot peening, the gear surface roughness reaches Ra≤0.2μm, effectively reducing friction.

6. A gear box noise reduction method according to claim 1, characterized in that: The installation accuracy control includes controlling the centering accuracy of the gear shaft and the gear box within 0.05mm during installation to avoid uneven meshing due to eccentricity, and using a laser alignment instrument to perform accuracy checks to ensure that the centering error between the gear box and the drive shaft does not exceed 0.05mm. The load control and operating specifications include ensuring that the gear box operates under rated load, with the maximum load not exceeding 120% of the rated load, and the operating speed is controlled within ±5% of the design speed to avoid noise caused by overspeeding.

7. A gear box noise reduction method according to claim 1, characterized in that: The regular maintenance and inspection include formulating a semi-annual inspection plan based on the working environment, checking the degree of gear wear and the quality of lubricating oil, and regularly conducting vibration and noise tests to ensure that the equipment is in the best working condition.

8. A gear box noise reduction method according to claim 1, characterized in that: The noise monitoring equipment includes a high-precision noise monitoring instrument installed near the gearbox. The monitoring range covers 40dB(A) to 100dB(A) with a resolution of 0.1dB. When the noise exceeds 80dB(A), the system automatically triggers an alarm to notify maintenance personnel to conduct an inspection. The data feedback and analysis includes uploading real-time noise data to the central control system through sensors, performing data analysis, finding the source of noise and making adjustments, using a spectrum analyzer to perform frequency domain analysis on the noise, identifying the main noise frequency bands and taking corresponding adjustment measures.

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