Reasons for unilateral engagement of herringbone gear of reducer
In the production of reducers from some manufacturers, high-speed bearings are often overheated. The gear engagement of reducers is not good, resulting in unilateral engagement. Analysis shows that this situation has a lot to do with gear assembly and bearing selection.
Herringbone gear requires that the two end faces of the gear should be perpendicular to the axis, and the plane formed by the symmetrical center points of the left and right helical gears should also be perpendicular to the axis. However, there will be errors in the actual processing and assembly of the gear. After the herringbone gear with errors is assembled on the shaft, the closed loop formed by the symmetrical center point of the left and right rotating gears is not a plane perpendicular to the axis, but a curved surface. The trajectory of the curved surface around the axis is two different curves. When a pair of meshing gears are in operation, their symmetrical centerlines coincide. Then, the symmetrical centerlines of this pair of herringbone gears will coincide and overlap during gear meshing. The result will inevitably be the superposition of peaks and valleys, that is, error accumulation. The final result is the axial displacement of the gear shaft.
This is the difference between herringbone gear and spur gear. This feature can not be ignored, and should be considered in the process of bearing selection and box assembly.
Analysis of the Causes of the Abnormal Start up of the Cylindrical Gear Reducer
When the cylindrical gear reducer breaks down, the first thing you may think of is to find professional maintenance personnel to disassemble and repair it. In fact, when the machine breaks down, we can first do a self inspection. Listen to the sound to determine the cause of abnormal vibration and noise when the cylindrical gear reducer starts. Now let's listen to what the old driver of the reducer manufacturer said.
Listening to the sound is mainly to listen to whether the bearing has noise. We can buy a sound listening stick in the market, and the other end of the stick is equipped with a resonator device, or use a single metal bar to listen to the sound.
Listen to the bearing noise of cylindrical gear reduction motor
Normal sound - there is no continuous metallic sound that goes up and down.
Retainer Sound - Light "excitation" sound generated by the rotation of the roller or ball at the same time, including irregular metal sound unrelated to the speed. If the sound becomes smaller or disappears after adding lubricating oil, it will not affect the operation.
Cracking sound - the sound generated when cracks appear on the raceway surface of the bearing, the surface of the ball and roller, and its period is proportional to the speed. When the bearing cracks, it shall be replaced quickly before overheating and sintering. "Creak" sound - most of it is made in roller bearings. The "creaking" sound will disappear after adding lubricating oil. When there is a creaking sound without abnormal vibration and temperature at the same time, the machine can be used as usual.
Reasons for unilateral engagement of herringbone gear of reducer
Research on Maintenance of Cylindrical Gear Reducer
The maintenance methods and quality standards of the cylindrical gear reducer are mainly described, the key points for the management and control of the disassembly and maintenance of the cylindrical gear reducer are proposed, the relevant precautions for the disassembly and assembly of the reducer are introduced, and the methods and experience of bearing replacement, clearance adjustment, and fit clearance measurement are expounded.
Preparation of spare parts and tools. Before the commencement of work, the materials and spare parts used in the maintenance shall be comprehensively inspected and checked to ensure that they are in good condition and available. The used maintenance tools shall be comprehensively inspected and tested for appearance. The cable reel, electric tools and lifting tools shall be within the inspection cycle and pass the appearance inspection. After passing the inspection, all of them shall be transported to the designated location on the maintenance site for on-site inspection and preparation. Fixed location management shall be carried out at the maintenance site. Before commencement, the layout of the maintenance site shall be completed, all inspection measures shall be implemented, and the work ticket has been handled, which is ready for commencement. Construction period disclosure. The person in charge of the work shall explain the precautions, maintenance quality requirements and work progress to the staff, and then enter the work site to start the maintenance work.
1. Remove each bearing outer ring (mark it), lift out the high-speed shaft, medium speed shaft and low-speed shaft of the reducer, and place them in the maintenance area. Preliminary inspection for gear and shaft of reducer shows that there are no cracks, broken teeth and falling blocks, and the gear is not loose on the shaft.
2. Make limited arrangements to check the wear of the reducer shaft head framework oil seal joint and shaft surface for timely brush plating. The shaft surface is evenly worn, and the wear groove is less than 0.3mm, otherwise it shall be treated. Priority shall be given to checking the signs of rotating wear of the bearing housing of the reducer housing bearing hole, and the wear of the bearing retainer ring and end cover shall be recorded for targeted measurement.
3. The mechanical oil in the reducer shall be stored in a special oil cylinder, the box shall be cleaned with kerosene, and the interior of the reducer box shall be preliminarily inspected (the oil stain on the ground shall be cleaned in time to avoid personnel slipping). In combination with the external leakage of the reducer box, make marks and focus on the points inside the box to check that there are no cracks or abnormalities. Clean the sealant on the joint surface of the upper and lower gearbox of the reducer, and check the sealing surface.
Fracture failure analysis of reducer shaft
By means of macro and micro morphology analysis, chemical composition analysis, mechanical property test and SEM micro morphology analysis, the reason for the fracture of the reducer shaft was analyzed. The results showed that the main reason for the fracture of the reducer shaft was the nonstandard heat treatment process and the formation of the Viewview structure; The unreasonable design position of the keyway accelerated the fracture of the reducer shaft.
Reasons for unilateral engagement of herringbone gear of reducer
The direct reading spectral chemical composition analysis results of the reducer shaft material are shown in Table 1. The composition analysis results show that the reducer shaft material is carbon steel and does not contain other alloy elements. According to the general material selection principle of shaft parts, and in combination with the chemical composition range of 45 steel specified in the standard, except that the silicon content slightly exceeds the standard, other elements meet the requirements of steel. It can be determined that the reducer shaft material is 45 steel.
The motor reductor is a kind of lifting component, which has many advantages such as compact size, light weight, wide power source, many functions, multiple supporting forms, high reliability and long service life. It can be used in a single unit or in combination. It can accurately control the height of the lifting or pushing according to a certain procedure. It can be directly driven by electric motor or other power, or it can be manually. It has different structural forms and assembly forms, and the lifting height can be customized according to user requirements. The worm gear motor reductor can be self-locking. Today, there is a small series for everyone to introduce in detail about the motor reductor in the lifting of the precautions, I hope to help you.
A good load-bearing instrument can't leave the excellent power advantage first, which is especially true for the motor reductors that are used frequently in various industrial fields in China. After all, the motor reductor is a large lifting instrument. If we do not better guarantee the power source of the instrument when using it, it will definitely affect the perfect operation of the motor reductor. Therefore, everyone pays attention to this when purchasing the motor reductor, which effectively guarantees the silk. Good operation of the pole lift. The motor reductor is different from other load-bearing instruments. It is mainly raised or lowered by a very strong hard wire, which effectively guarantees the flexibility of the motor reductor during use. Therefore, we must better protect it. The power source of the instrument. When the motor reductor is hoisted, the specific power source is often the first thing everyone pays attention to when using it. After all, the weight of each industrial field is very large when it is raised or lowered. If the motor reductor does not have good power. Source, that will inevitably lead to the failure of our related work items, so we must be unified.
Reasons for unilateral engagement of herringbone gear of reducer
In the selection of the motor reductor, it is necessary to pay attention to the screw shaft speed and the accepted load, and to test the allowable large load of the motor reductor, the allowable external load, and the rotational speed of the screw shaft, such as the overtake product. The data will cause serious damage to the entire lifting equipment. The worm gear motor reductor can not exceed the maximum allowable load, whether it is static load, dynamic load or impact load. It is necessary to select a lift with sufficient capacity according to the coefficient, the travel stroke and the stability of the screw. When the elevator is working, the external temperature of the deceleration part should be controlled within the range of -15 °C ~ 80 °C, and the external temperature of the movable nut is also within this range. Consider the load on the motor reductor. The choice of the lift is that the static load, the dynamic load and the impact load cannot exceed the large load that it is allowed to bear. The lift with sufficient capacity should be selected according to the coefficient, the travel stroke and the stability of the proof screw. Determine the speed ratio of the lift. The speed ratio of the motor reductor is generally divided into normal and slow speed, which needs to be determined according to the actual use. Determine how the motor reductor is connected to the motor. Connections are flanged and biaxial. The head type of the motor reductor is cylindrical, flanged, threaded and flat.
S series worm gear reducer has high transmission precision and is especially suitable for working in places with frequent start. It can be connected with various types of reducers and equipped with various types of motor drive. It can be installed in the 90 degree drive operation position. Adapted to various installation methods, performance, safety and reliability, long service life, and implementation of international standards.
1. S series helical gear worm gear motor has high technical content, and has a helical gear and worm gear integrated drive to improve the torque and efficiency of the machine. This series of products has complete specifications, wide speed range, good versatility, adapt to various installation methods, performance, safety and reliability, long service life, and implementation of international standards.
2. The surface of the body has concave and convex heat dissipation, strong vibration absorption, low temperature rise and low noise.
3. The machine has good sealing performance and strong adaptability to the working environment.
4. The machine has high transmission precision, especially suitable for working in places with frequent starting. It can be connected with various types of reducers and equipped with various types of motor drives. It can be installed in the 90-degree transmission operation position.
5. The key components of the motor are made of high wear-resistant materials and have undergone special heat treatment. They have high processing precision, stable transmission, small volume bearing capacity and long service life.
Reasons for unilateral engagement of herringbone gear of reducer
6. The reducer can be equipped with various types of motors to form an electromechanical integration, which fully guarantees the quality characteristics of the products.
S series helical gear worm gear reducer model:
S37, S47, S57, S67, S77, S87, S97
SF37, SF47, SF57, SF67, SF77, SF87, SF97
SA37, SA47, SA57, SA67, SA77, SA87, SA97
SAF37, SAF47, SAF57, SAF67, SAF77, SAF87, SAF97
SAT37, SAT47, SAT57, SAT67, SAT77, SAT87, SAT97
SAZ37, SAZ47, SAZ57, SAZ67, SAZ77, SAZ87, SAZ97
S series helical worm gear reducer performance characteristics:
1. The combination of helical gear and worm gear has compact structure and large reduction ratio.
2. Installation method: foot installation, hollow shaft installation, flange installation, torque arm installation, small flange installation.
3. Input mode: motor direct connection, motor belt connection or input shaft, coupling flange input.
4. Average efficiency: The reduction ratio is 77% for 7.5-69.39; 62% for 70.43-288; and 57% for S/R combination.
5. Combination with the R series can get a larger speed ratio.
The S series helical worm gear reducer is a very efficient transmission machinery product. It can get the gear ratio required by customers through the mutual transmission between several sets of gears, which is very popular among customers. Since the machining accuracy of the gear is higher than that of other series of reducers, the product is characterized by low noise and stable operation. The core component of the gearbox is the gear, so the material selection and processing of the gear is very important. At present, the gear material generally used is 20CrMnTi, and the processing technology is carburizing and quenching, thus ensuring that the gear will not wear and be deformed in the long-term operation in the future. Cast iron HT250 is generally used for the cabinet, and some customers have high requirements, and cast steel can also be used. Bearings are generally selected from Harbin bearings, and oil seals are imported oil seals.
The piv motor reducer drive has many unique advantages compared to the cylindrical piv gear box drive. Its most notable feature is that it can perform power splitting when transmitting power; at the same time, its input shaft and output shaft are coaxial, that is, the output shaft of p.i.v. gearbox and the input shaft are both disposed on the same spindle line. Therefore, piv motor reducer transmission has been used to replace ordinary gear transmission, and as a speed increaser and transmission piv gearbox in various mechanical transmission systems like guomao gearbox.
