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Skeleton oil seal specification
2019 / 07 / 01
It is no exaggeration to call a bearing a joint of a car. In a car, not only the wheels need to use bearings, but all the machine parts that will change are indispensable for the participation of the bearings. It is a very inconspicuous but very serious thing in the transmission system. Because of the large amount of work, its wear is also relatively high, so replacing the bearing is a common job in car repair. Here are a few common ways to distinguish between bearing quality: Whether the outer packaging is clear: Under normal circumstances, the factory brand has a special depiction of the external packaging, and the factory that produces the production conditions is manufactured, so the packaging is clear from the line to the color block. . Some imported brands also have a common depiction on their own packaging to protect their intellectual property, which will be continuously analyzed in the future. Whether the steel printing is clear: brand words, labels, etc. will be printed on the bearing body. The font is very clear. The fonts of counterfeit products are not only vague, because the printing skills are rough, the fonts float on the surface, and some can even be easily erased by hand. Is there any noise: hold the inner sleeve of the bearing with your left hand, and turn the outer sleeve with your right hand to make it rotate to hear if there is any noise. Because the production conditions of some counterfeit products are backward, and the hands-on operation is completely carried out, it is inevitable that impurities such as sand will be incorporated into the bearing body during the production process, so the noise will be announced during the rotation. This is the biggest difference between a factory brand that strictly enforces production specifications and operates with machines.
2019 / 06 / 28
Bearing inspection and repair 1) Inspection and correction of the bearing housing hole The damage of the crank bearing in use is mainly wear, fatigue peeling and melting. When the engine is overhauled, new bearings must be replaced. Before repairing the bearing, first check whether the bearing housing hole meets the requirements. The roundness and cylindricity error of the bearing housing hole is not more than 0.015mm. The method of inspection and correction is: clean the bearing seat, install the bearing cap, and tighten the fixing bolt or nut according to the specified torque. When the roundness and cylindricity of the seat hole are exceeded, the welding can be welded on both ends of the bearing cap. Machining or padding adjustment, it is not allowed to repair the bearing cap. Clean the oil of the journal and bearing, cut the gap of the plastic wire into the same length as the bearing width, and place it on the crank pin so that it is parallel to the center line of the shaft. Carefully install the bearing cap and set the nut according to the regulations. Torque tightening, carefully remove the bearing cap, use the measuring tape printed on the plastic line gap gauge bag, measure the width of the widest part of the flattened plastic wire, and obtain the gap value. Replace the new bearing when the limit value is exceeded. 2) Matching of bearings At present, the commonly used bearing alloys for gasoline engine crankshaft bearings are babbitt and high-tin aluminum alloy. The thickness of the alloy layer is 0.30~0.35mm. In addition to the standard size, the bearing size is reduced by 0.25mm according to the inner diameter. The primary repair size corresponds to the crankshaft journal for use in repairs.
General manufacturing materials for plain and plain bearings
2019 / 06 / 17
A bearing that is subjected to a sliding motion by a shaft and a bearing is called a sliding bearing. According to the principle of oil film formation on the two opposite moving surfaces of the sliding bearing. Can be divided into fluid dynamic pressure lubrication bearings (also known as dynamic pressure bearings) and hydrostatic bearings (also known as hydrostatic bearings). Generally discussed is a hydrodynamically lubricated bearing that carries oil between two surfaces by relative movement of the shaft and the bearing to form a sufficient pressure film to separate the two surfaces to withstand the load. Commonly used bearing materials are divided into metal materials and non-metal materials. (1) Cast iron. Ordinary gray cast iron or wear-resistant gray cast iron with nickel, chromium and titanium alloy composition, or ductile iron can be used as a material for light-load low-speed bearing bushes. In these materials, a sheet-like or spheroidal graphite component is coated on the surface of the material to form a layer of lubricating graphite. After the surface of the wear-resistant cast iron is phosphating, a porous thin layer can be formed, which helps to improve the wear resistance. (2) Bearing alloy. (usually babbitt or white alloy) bearing alloys are divided into two categories: one is based on tin, adding appropriate amount of bismuth and copper, called tin-based bearing alloys, such as ZChSnSb11-6; the other is Lead is the basic component, and an appropriate amount of tin and antimony is added, which is called a lead-based bearing alloy such as ZCnPbSn16-16. (3) Copper alloy. Copper alloys can be divided into: cast lead
2019 / 06 / 10
First, the advantages of stainless steel bearings 1, excellent corrosion resistance: stainless steel bearings are not easy to rust, with strong corrosion resistance. 2, washable: stainless steel bearings can be washed down without having to re-lubricate to prevent rusting punishment. 3, can run on the liquid: due to the materials used, we can run the bearings and housings in the liquid. 4, the depletion speed is slow: AISI 316 stainless steel, no oil or grease anti-corrosion protection. Therefore, if the speed and load are low, there is no need to lubricate. 5. Hygiene: Stainless steel is naturally clean and non-corrosive. 6. High heat resistance: Stainless steel bearings are equipped with high temperature polymer cages or cages that are not in a complete complementary structure and can operate at higher temperatures ranging from 180°F to 1000°F. (Need to be equipped with high temperature grease) Second, stainless steel bearings 304 and 440 material difference Stainless steel bearings are now divided into three materials 440, 304, 316, the first two are more common stainless steel bearings. The 440 material is definitely magnetic, that is, the magnet can be sucked. 304 and 316 are micro-magnetic (many people say that he is not magnetic, this is not true) that is, the magnet can not absorb, but you can feel a little suction. Generally stainless steel housings are made of 304 material. So is the material of the stainless steel housing 304 good or 440? 304 is the most used stainless steel, the price is lower than the 440 anti-corrosion ability, mechanical properties, etc., the comprehensive performance is more comprehensive, so it is more common applications. The disadvantage, however, is that no further heat treatment can be performed to change its performance. 440 is a high-strength cutting tool steel (tailed with A, B, C, F, etc.), which can obtain a high yield strength after proper heat treatment, and is among the hardest stainless s
Selection of Process Technology from Wear Analysis of Reducer Bearing Room
2019 / 06 / 03
For the design of the reducer, the general housing and the outer ring of the bearing adopt a clearance fit. During the operation of the bearing, the direction of the force is fixed, and mainly bears the reaction force generated by the meshing between the gears. If the circumferential direction of the bearing outer ring is always fixed, the force will always act on a fixed point of the outer ring of the bearing, which is more likely to cause metal fatigue and reduce the service life of the bearing. In theory, during the actual operation, the outer ring of the bearing is allowed to rotate slowly within a certain period of time. This can effectively prevent the reaction force from always acting on a certain point of the outer ring and delay the fatigue wear of the bearing. Through the analysis of the design theory, it is considered that this is one of the most fundamental causes of the bearing chamber wear of the reducer. Because there will always be deviations between theory and practice, there will be uncertainty in the design, manufacturing and assembly. It is difficult to effectively ensure the clearance between the bearing chamber of the reducer and the outer ring of the bearing, and it is difficult to ensure that the outer ring of the bearing rotates one revolution. cycle. Therefore, the length of time that the outer ring of the bearing rotates for one week will directly determine the service life of the bearing chamber. However, the actual application of the outer ring rotation cycle cannot be guaranteed. Firstly, the common techniques and techniques are analyzed. The common methods are insert bushing, pitting, surfacing, brush plating, thermal spraying, laser cladding, etc. These repair processes are emerging while promoting technological process improvement and development. It is also limited by compl
2019 / 05 / 27
Fan bearing difference Radiator development has been accompanied by two major themes - cooling and mute. The easiest way to improve the heat dissipation performance is to increase the fan speed. As the fan speed increases, the noise also increases. At this time, the noise comes from two aspects. On the one hand, the sound of cutting the air when the fan is running, and the other is the sound generated by the friction of the fan mechanical equipment. This sound is emitted from the bearing. Some radiators whose quality is not good often cause poor use of the fan. If you buy that kind of product, it may take a long time to enjoy the horrible noise caused by the bearing. From this, how important the bearing as an important part of the fan is to our radiators. These fan bearings are more common in the market. Let's take a look: 1. Oil bearing SleeveBearing Oil bearing SleeveBearing: This type of bearing can be said to be the older bearing technology on the market. However, due to its low cost, it is technically easy to implement. Many products, including well-known brands, are still in use. The advantage is that it is used initially. Quiet, low noise, low price; but generally in the later period due to the internal fuel volatilization and the entry of dust, causing serious wear on the bearing, resulting in slower speed, increased noise, and an average life of only 8,000 to 15,000 hours. 2, Lai Fu Bearing RifleBearing RifleBearing: Rifle Bearing, developed by CoolerMaster, uses a shaft core with a reverse spiral groove and a slinger. When the fan is running, the oil will form a reverse migration, thus avoiding oil loss and acting as an oil bearing. Reconstruction type, Laifu bearing
The role of alloying elements in precision bearing rolling bearing steel
2019 / 05 / 20
1. The role of silicon in GCr15 bearing steel It is beneficial to the formation of the body-centered cubic ferrite structure. It does not form carbides in the steel. It is on the left side of the iron in the periodic table and is mainly dissolved in iron. It has little effect on the diffusion coefficient of carbon in austenite, and has no effect on the formation rate of austenite. It can raise the A1 point and relatively slow the formation of austenite. If the austenite grain size is slightly hindered or ineffective during heating, the pearlite phase transformation can be delayed to shift the C curve to the right, so that the nose on the C curve moves to a high temperature region, which lowers the Ms point and improves the supercooled austenite. The stability of the body, thereby reducing the quenching critical cooling rate and improving the hardenability of the steel. It can significantly slow down the decomposition of martensite at lower temperature, but does not slow down the decomposition of martensite at tempering at 400-500 °C, significantly hindering the accumulation of carbides, hindering the elimination of various types of distortion in steel during tempering. The effect, and generally delays the recovery, recrystallization and carbide aggregation process of the α phase of the quenched steel, thereby inhibiting the reduction of the hardness and strength of the steel and enhancing the tempering stability of the steel. The recrystallization temperature of the α phase can be increased, the temper brittleness of the steel can be significantly enhanced, the phase structure of the steel can be changed, and the amount of pearlite can be increased. The main purpose is to increase the hardenability of the steel. All the hardened parts can obtain high and uniform comprehensive mechanical properties after high temperature tempering, especially the high yield ratio, which significantly strengt
2019 / 05 / 13
Steel is an alloy containing iron and carbon as its main components, and its carbon content is generally less than 2.11%. Steel is an extremely important metal material in economic construction. Steel is divided into two categories according to its chemical composition: carbon steel (carbon steel for short) and alloy steel. Carbon steel is an alloy obtained from smelting of pig iron. In addition to iron and carbon as its main components, it also contains a small amount of impurities such as manganese, silicon, sulfur and phosphorus. Carbon steel has certain mechanical properties, good process performance, and low price. Therefore, carbon steel has been widely used. However, with the rapid development of modern industry and science and technology, the performance of carbon steel can not fully meet the needs, so people have developed a variety of alloy steel. Alloy steel is a multi-component alloy obtained by preferentially adding certain elements (called alloying elements) on the basis of carbon steel. Compared with carbon steel, the performance of alloy steel is significantly improved, so it is increasingly used. Due to the wide variety of steels, steel must be classified for ease of production, storage, selection and research. Steel can be divided into many categories according to the use, chemical composition and quality of steel: One. Classified by purpose According to the use of steel, it can be divided into three categories: structural steel, tool steel and special performance steel. Structural steel: 1. Steel used as various machine parts. It includes carburized steel, quenched and tempered steel, spring steel and rolling bearing steel.
Tips for disassembling the outer spherical bearing
2019 / 05 / 05
The outer spherical bearing is a self-aligning bearing with a spherical surface on the outer surface of the bearing outer ring and a sealing cover on both sides of the bearing. 390000 series outer spherical bearings are commonly used in agricultural machinery. These bearings are widely used in Xinjiang 1, 2, Futian, Zhongyuan and other combine harvesters, and more than 30 disks are used on one locomotive. The 390000 series outer spherical bearing is used to fix the inner ring of the bearing and the shaft through an eccentric sleeve, and the hexagon socket screw on the eccentric sleeve is used for fastening. In the maintenance, many operators will not disassemble such bearings, so it is necessary to introduce the technical points and precautions for disassembling the 390000 series spherical bearings: First, disassembly 1. First loosen the locking screw on the eccentric sleeve of the bearing with an Allen key, then insert the small iron rod into the counterbore on the eccentric sleeve of the top cover, and loosen the eccentric sleeve against the direction of rotation of the shaft. 2. Loosen the bolts that secure the bearing housing. Remove the bearing from the shaft together with the housing. Note before removing the bearing housing at one end of the shaft. The bearing block bolts at the other end of the shaft should be loosened to prevent the bearings at both ends from being damaged by each other. Second, the installation 1. Before installing the bearing on the shaft, the bearing pin of the bearing sleeve must be unplugged, and the surface of the journal should be smoothed and cleaned, and the oil is rust-proof and lubricated at the journal (allowing the bearing to rotate slightly on the shaft).
2019 / 04 / 26
Oil seal is a mechanical component used to seal oil (oil is the most common liquid substance in the transmission system, also refers to the general liquid substance). It isolates the parts of the transmission parts that need to be lubricated from the output parts, so as not to let the lubrication Oil leaks. Seals for static and dynamic seals (generally reciprocating) are called seals. The representative form of the oil seal is the TC oil seal, which is a double-lip oil seal with a self-tightening spring completely covered by rubber. Generally speaking, the oil seal often refers to this tc skeleton oil seal. What material is the oil seal? The oil seal is made of rubber. The oil seal is mainly used in the joint parts of two lubricating parts to prevent oil leakage, such as crankshaft oil seal, semi-shaft oil seal, transmission shell oil seal and the like. What is the skeleton oil seal? The skeleton oil seal is a typical representative of the oil seal. Generally speaking, the oil seal refers to the skeleton oil seal. The function of the oil seal is generally to isolate the parts of the transmission parts that need to be lubricated from the output parts, so as not to let the lubricating oil leak. The skeleton acts like a reinforcing bar inside the concrete member, which acts to strengthen and maintain the shape and tension of the oil seal. According to the structure, the single lip skeleton oil seal and the double lip skeleton oil seal can be divided. The secondary lip of the double-headed skeleton oil seal acts as a dustproof to prevent dust and impurities from entering the inside of the ma
Slewing bearing installation method
2019 / 04 / 24
1. Preparation before installation (1) Unpack and check the attached certificate and the slewing bearing sign to confirm that it is consistent with the selected model. (2) Carefully check the appearance and confirm that the slewing bearing is not subjected to major damage during transportation, such as severe corrosion, deformation, etc.; confirm the presence or absence of the soft belt mark and the maximum position mark of the gear jump (the gear requires quenching or the customer has special requirements) ). (3) The mounting bracket should have sufficient rigidity to prevent the slewing bearing from being installed due to insufficient rigidity of the bracket and deformation caused by the slewing bearing. (4) The installation plane must be clean and flat, and must not have iron filings, burrs or other debris. (5) For the installation of the slewing ring, the bolts with the strength registration should be selected. Bolts and nuts shall comply with the requirements of GB3098.1 and G B3098.2. Spring washers are prohibited. 2. installation (1) Place the slewing bearing horizontally on the mounting bracket, and place the soft belt and the blocking position in the non-load zone, the non-frequent load zone or the light load zone. (2) Check the contact between the slewing bearing plane and the mounting plane with a feeler gauge. If there is a gap, the material should be filled with the material to fill the gap to prevent the slewing bearing from deforming after the bolt is tightened. (3) The mounting bolts should have sufficient pre-tightening
How to correctly install non-standard bearings
2019 / 04 / 22
There are many types of non-standard bearings, including size, shape, and material, such as the inner ring protruding, the outer ring wrapping, the outer ring slotting, etc., and the common ones are nothing more than the above. Although the installation conditions of non-standard bearings are not very strict, but also pay attention to some details. For example, when installing, it should be farther away from the machine that produces debris or powder and moisture, to prevent pollutants from entering the inside of the bearing, especially sand damage to the bearing life is the most serious. Before installation, be sure to check the surface of the bearing, whether there are attachments, scratches, sand, rust, etc. If so, please clean it in time. Because those attachments and scratches will grind the inner ring surface of the non-standard bearing, resulting in bearing damage. The influence of rust is more serious. Therefore, the journal and the mounting base hole must be thoroughly inspected before installation. If there is foreign matter or damage, the bearing needs to be processed before installation. There are also conditions for whether the inner and outer surfaces of the various joints are clean or smooth, and if they are installed without cleaning, they will shift during use of the bearing. Although the installation operation of non-standard bearings is simple, it pays great attention to the external environment, especially the details. To do this, we can extend the life of non-standard bearings.
Bearing sleeve machining tool selection
2019 / 04 / 19
1. Types and selection of CNC turning tools Turning tools for CNC turning are generally divided into three categories, namely pointed turning tools, circular turning tools and forming turning tools. When the CNC lathe is roughing, it requires high tool strength and good durability to meet the requirements of large roughing backing and high feed speed. When the CNC lathe is finished, it is necessary to select a tool with high precision, sharpness and high durability to ensure the machining accuracy. In order to facilitate the tool setting and reduce the tool installation time, try to use the machine clamping knife, the tool material is best to use the coated carbide blade. The geometry of the insert (such as tip radius, geometry, etc.) should be determined by the shape of the machined part. It is important to note that when machining a spherical surface, a tool with a large off-angle should be used to prevent the flank of the tool from interfering with the workpiece. 2. Tool selection for NC machining of bearing sleeve 45° carbide end face turning tool end face, tool number T01; Use φ3.15 center drill to drill the center hole of φ3.15, cutter No. T02; Use φ26 taper shank twist drill to drill the bottom hole, knife No. T03; Use a non-through hole carbide boring tool to rough the inner hole, knife No. T04; The outer contour surface of the rough car of 93° carbide roughing tool is selected, the tool number T05; The outer contour surface of the 93° cemented
2019 / 04 / 17
1. Loading tool The CKA6150 CNC lathe used for machining bearing sleeves is a six-station automatic tool holder. The tool must be adjusted to the same height as the spindle center line. The length of the shank should be 1.5 to 2 times the thickness of the shank. The general principle of loading a knife is that tools with similar functions are installed nearby, and process switching and tool replacement should be completed in a short period of time. 2. Mounting the workpiece CNC lathes generally use three-jaw self-centering chucks. The installation and alignment of the workpieces are basically the same as those of horizontal lathes. For the round bar material to be clamped, it should be placed horizontally in the jaws of the chuck, and after calibration, tighten the wrench of the chuck, and the workpiece clamping is completed immediately. 3. Tool setting The tool point is the reference point of the tool, and it is also the gaze point when the tool is placed. It is usually a point on the tool. The tool point is the point used to determine the relative positional relationship between the tool and the workpiece. It is the point that determines the workpiece coordinate system and the machine coordinate system. The tool setting is to place the tool's tool point on the tool point to establish the workpiece coordinate system. The principle of selection of the knife point:
Bearing component processing process
2019 / 04 / 16
1. Processing of the ferrule: The processing of the inner ring and the outer ring of the bearing varies according to the raw material or the form of the blank. The process before the machining can be divided into the following three types: the whole processing process is: bar material or Pipe material (some bars need to be forged and annealed, normalized)----Car processing----heat treatment----grinding----finishing or polishing----final inspection of parts-- --Anti-rust----into the warehouse----(to be combined with the package) 2. The processing of steel balls, the processing of steel balls also varies according to the state of the raw materials. The processes before the frustration or the photosphere can be divided into the following three types: the process before the heat treatment, and can be divided into The following two processes, the whole process is: bar or wire cold-punching (some bars need to be punched and annealed after cold-shrinking)----frustration, rough grinding, soft grinding or light ball---- Heat treatment----hard grinding----fine grinding----finishing or grinding----final inspection group----rust prevention, packaging----into the warehouse <to be combined with the package>. 3. Roller processing The processing of the rollers varies according to the raw materials. The process before the heat treatment can be divided into the following two types. The whole processing process is: bar material processing or wire cold rolling after the string ring And soft grinding----heat treatment----string soft point----rough grinding outer diameter----rough grinding end face----finishing end face----fine grinding outer diameter----final grinding Outer Diameter----Final Inspection Group----Anti-rust, packaging----into the warehouse (to be combined with the package). 4. Process
What happens when the car bearing is broken?
2019 / 04 / 15
When the wheel bearing of the automobile is damaged, the continuous frictional collision sound will be transmitted from the corresponding position of the chassis wheel during driving. Usually, the abnormal friction between the brake hub and the brake pad will greatly increase the driving resistance, and in the case of serious damage, the wheel will be damaged. The mechanism caused the hub to fall off, causing serious traffic accidents. When the hub bearing is damaged, the brake drum should be removed to check if the bearing is defective. When repairing, remove the wheel, use a screwdriver to pry off the dust cover, use pliers to remove the locking pin on the shaft idle nut, turn the brake drum with one hand, and tighten the hub fixing nut with a wrench. As soon as there is significant drag and friction at the bearing, loosen the nut slowly until the nearest pin hole is aligned and a new cotter pin is inserted (notable: under no circumstances can The nut is reversed and retracted by 1/4 turn, otherwise the hub bearing will be loose and cause early wear). After inserting the split pin, the end should be removed and bent to prevent it from falling off. Finally, buckle the dust cover back onto the brake drum and put it back on the wheel. Grab the upper and lower sides of the wheel and shake it to allow a little play. If there is serious damage to the hub bearing, there are cracks, pitting or ablation on it and must be replaced. Apply grease before installing new bearings, and then install them in reverse order. The replaced bearings must be flexible and free of miscellaneous and vibration.
Classification of marking machines
2019 / 04 / 12
1. Lamp pumped YAG laser marking machine The lamp pump YAG laser marking machine adopts a stable and efficient concentrating cavity and a large multiple laser beam expanding system. The beam quality is better, the laser power is large, the peak power is high, the pulse width is small, and the energy is more concentrated. The current and software control are continuously adjustable, and the engraving depth is deep (<2.0mm); the industry application is more targeted. Large laser power, good stability; stable laser mode, narrow pulse width, more concentrated laser energy; uniform and fine engraving line width (<150μm); strong engraving depth and high efficiency; complete optical path sealing, strong environmental adaptability; Beautiful appearance and reasonable mechanical structure. application: YAG lamp pump laser marking machine is widely used in hardware, precision machinery, electronic components and other industries, especially suitable for mold processing, printing wheel engraving and all metal marking requirements requiring deep engraving. In the metal engraving application, the machine has the characteristics of deep depth, fast speed, stable operation and fine graphics. The metal materials can be iron, stainless steel, copper, aluminum and so on. Typical application cases, such as indexing and marking of circular and umbrella metal dials for various machine tools, laser marking of metal ruler scales, etc. 2. Semiconductor pumped YAG laser marking machine The semiconductor pump laser marking machine uses a semiconductor laser diode (measuring surface or end face) with a wavelength of 0.808um to pump Nd:YAG medium, so that the medium generates a large number of inve
What is the bearing seal made of?
2019 / 04 / 11
Nitrile rubber: Nitrile rubber is a general-purpose sealing material. It is a rubber synthesized from acrylonitrile and butadiene and has good resistance to the following media. Most mineral oils and mineral oil based greases General fuels such as gasoline, diesel and light civilian fuels Animal oil, vegetable oil and fat Hot water The nitrile rubber seal also allows the bearing to operate for a short period of time without oil. The permissible operating temperature range is -40 to 100 °C. It can withstand temperatures up to 120 ° C in a short time. However, it is not advisable to operate at higher temperatures because the nitrile rubber will harden. Hydrogenated nitrile rubber Hydrogenated nitrile rubber has more wear resistance than nitrile rubber, so seals made from this material have a longer working life. In addition, hydrogenated nitrile rubber has greater resistance to heat, ageing and hardening in hot oil or ozone. Hydrogenated nitrile rubber allows a maximum operating temperature of 150 ° C, which is much higher than the operating temperature of nitrile rubber. fluororubber The main characteristics of fluororubber are high temperature and chemical resistance, good anti-aging and ozone resistance, and very low gas permeability. Fluororubber still has excellent wear resistance even under very harsh working conditions. It can withstand operating temperatures of 200 ° C or below. Seals made of this material allow th
How to judge the front wheel bearing is broken
2019 / 04 / 10
The most obvious phenomenon that the front wheel bearing is broken is that after the car is running, it will make a loud noise. Then the way to judge the front wheel bearing is broken is to listen carefully to whether there is such a sound while driving. Another method of judging is to turn the tire in the right hand and place the left hand on the shock absorbing spring to induce vibration. If the spring has a large vibration, it indicates that the bearing is broken. Because the front wheel bearing is damaged, it will aggravate the friction. When the vehicle is just running, it will generate a lot of heat. At this time, touch with your hand and you will feel hot. If the noise is caused by the abnormal sound, the direction will be left and right when driving, the direction will be left, the noise will disappear, and the direction will be right. There is a problem with the left front bearing, otherwise the right side is the same. We can also temporarily stop and get off to check if the temperature of the axle is normal. Touch the four hubs with your hands and feel roughly the same. If there is little difference, the owner can continue to drive slowly to the repair station and then do the processing. The front wheel bearing is similar to the front and rear axle of the bicycle. There are beads inside the shaft, that is, the beads are broken. With the increase of the speed, the noise is large, which will not affect the safety. The cage and bearings are best replaced together. If the dust jacket of the cage is broken, it must be replaced. Otherwise, the cage will break again after a long time.
Maintenance and replacement tips for electric vehicle bearings
2019 / 04 / 09
Electric vehicle bearings are an important part of electric vehicles. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. According to the friction properties of moving components, bearings can be divided into two categories: rolling bearings and sliding bearings. Among them, the rolling bearing has been standardized and serialized, but its radial size, vibration and noise are larger and the price is higher than that of the sliding bearing. Bearing damage: 1, the quality of the bearing itself, the steel is not up to standard, the material is used poorly! 2, the bearing is exposed to the outside seal is not easy to enter the water, such as the front wheel right bearing; the motor does not have the brake end cover inside the bearing) and the oil seal is damaged, the water will wash the bearing butter, resulting in poor lubrication and rust, Increasing the friction causes the bearing to wear out the "scattering". 3. If the wheel impact is severely damaged or the shaft hardness is insufficient to cause bending deformation, the bearing will be biased during the operation, and the [inner circle" and the grinding [outer circle" will be ground, so that the bearing is unevenly damaged and damaged! 4. The machining accuracy of the bearing hole is inaccurate, the bearing is slightly deformed, the running friction is increased, and the bearing wears prematurely. When the bearing is exce
Maintenance precautions for sewage treatment equipment
2019 / 04 / 08
1. Sewage treatment equipment Replace the lubricating oil: open the oil hole screw inside the sealing chamber and the motor separately, release all the lubricating oil inside the sealed chamber and the motor, replace the new oil, and ensure the normal operation of the lubrication system. 2. Check the wearing parts of the sewage treatment equipment: the impeller, retaining ring, bushing, bearing seat, etc. of the submersible pump are wearing parts. First, the pump part should be removed to check whether the wearing parts are intact. Damaged and unqualified parts are strictly prohibited. 3. Demolition of the pump casing against rust: Before use in spring, the uppermost pump casing should be disassembled, and then the impeller should be turned and then closed to prevent the components from rusting and unable to start normally and burn the motor. This maintenance is especially important for water-filled motors. 4. Sewage treatment equipment Drying motor: Measure the insulation resistance of the winding and the outer casing of the submersible pump with a 500 megohm meter. If the resistance is less than 0.5 megohm, the motor moisture should be removed. The drying methods include an external drying method, a current drying method, and a combined drying method in which both are performed simultaneously. The external drying method is to use external heat source for treatment. Commonly used measures are: (1) blowing hot air: a blower using an electric heater (a small submersible pump for agriculture can use a hair dryer) to blow hot air to achieve the purpose of drying treatment; (2) bulb baking: In a closed box, several 200 watt bulbs are used for baking. Note that the baking temperature should not be too high and should be controlled below 125 °C; (3) Current drying: The three-phase windings of the motor can be connected in series or in parallel according to the impedance of the submersible pump and the size of the power supply,
Don't need a hammer, you know how to disassemble the bearing
2019 / 04 / 03
Spherical roller bearing bearings are installed correctly, affecting accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of thrust spherical roller bearing bearings. I hope to install according to the operating standards. The items of the job standard are usually as follows: (1) Check the size and finishing of the associated components; (2) installation; (3) Supply lubricant. (4) cleaning the bearing and bearing related components; (5) Check after installing the bearing. The spherical roller bearing bearing package is opened before the installation. Lubricating oil is not necessary for cleaning. However, for instruments or high-speed bearings, it should be cleaned with clean oil to remove the rust inhibitor applied to the bearing. Generally grease is lubricated, not cleaned, and directly filled with grease. Furthermore, bearings that have been sealed with grease are used without cleaning. The bearing with the rust preventive removed is easy to rust, so it cannot be placed. When installed in the outer casing, the general clearance fits a lot, and the outer ring has an interference amount, which is usually pressed by a press or a cold shrink fit method after cooling. When dry ice is used as a coolant and cold shrinkage is installed, the moisture in the air will condense on the surface of th
Why do high-end bearings use plastic cages?
2019 / 04 / 02
Bearing nylon cage, referred to as plastic protection, is a new generation of products that replace copper cages and iron cages. Compared with metal cages, it has numerous advantages: First, it is light in weight, which makes the bearing more flexible. If it is used in electrical appliances or power consumption products, it has a great effect on energy saving. Second, it has low noise and is the first choice for silent bearings. Especially, it has a great influence on electrical products with high noise requirements. Third, it can effectively extend the service life of the bearing, and reduce the friction between the metal cage and the steel ball. For extending the life of the bearing, the role of plastic protection is great.
Using "ceramic" to make engine bearings, the effect is better than metal
2019 / 04 / 01
China's hybrid ceramic bearing research and development officially opened With the support of the state, Harbin Bearing Company and Harbin Institute of Technology cooperated in the research and application of Si3N4 silicon nitride hybrid ceramics. Hybrid ceramic bearings combine the excellent properties of metal and ceramics. Its main components are inner and outer ring bearing steel, stainless steel retainer and silicon nitride ceramic ball. According to the data, the mechanical and physical properties of silicon nitride ceramic balls are the best in the field of high performance bearing technology. At high temperatures, the general bearing steel ball is easy to lose strength and hardness, and the silicon nitride ceramic ball can maintain its original hardness at 400 degrees Celsius, and it will fail at 800 degrees Celsius. Ceramic bearings will solve the problem of low efficiency and low speed of domestic bearings The ceramic ball in the hybrid ceramic bearing has oil-free self-lubricating function, that is, when the lubricating grease is dried, the bearing can still operate normally, and the rotation speed can reach 1.5 times of the metal bearing, so that the engine can improve the combustion efficiency and increase the thrust thereof. . In order to increase the speed and range of anti-ship missiles, and to improve the long-range strike capability of China's naval vessels, when using the domestic metal aerospace bearing test, the speed increased to 40,000 rpm and began to smoke, emitting strong noise, and then holding the shaft. Stop, and according to the design requirements, the turbine rotor should reach 120,000 rpm, so we have to introduce high-speed a
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