A: 1. With reasonable structural design and advanced nature, the bearing has a long service life.2. The metallurgical quality of the bearing material is the main factor affecting the early failure of the bearing. 3. Bearing installation conditions are still a key factor in use.
The measurement of the bearing hole can use the inner diameter gauge to check the reference size on the outer micrometer and measure the roundness and cylindricity of the bearing hole. Burning out the bearing often reduces the diameter of the bearing hole at the opening and the roundness is out of tolerance, which is extremely detrimental to the normal operation of the bearing. If the positioning surface of the connecting rod bolt is loose, the connecting rod bearing cap will shift and the roundness of the bearing hole will be out of tolerance. The roundness error of the bearing hole should be controlled within the dimensional tolerance, and the cylindricity should be strictly controlled.
A: 1. Rotating load, static load or directional load is not the nature of the load applied to the bearing, but the load phenomenon observed for each deep groove ball bearing ring. When deciding the fit of the inner and outer rings, it is necessary to see whether it is a rotating load or a static load, and then determine whether to use an interference fit or a gap fit.2. The load applied to the bearing can be divided into light load, conventional load, and heavy load according to the load, and can be divided into static load, variable load, and impact load according to the time change of the load. In addition, according to the load direction, it is divided into rotating load (also called circumferential load), static load (also called point load) or directional load.
A: Generally, the clearance of the bearing becomes smaller after use, because the reduction in clearance due to the temperature difference between the inner ring and the outer ring after the bearing is generally greater than the increase in clearance caused by the load. However, if it is an angular contact ball bearing, it depends on the size of the preload of the bearing during installation. If the preload has already made the bearing's clearance to a negative value, the clearance will increase slightly in use. There are many factors that affect the change of bearing clearance, the above opinions are for reference only.
A: Thrust bearings are divided into thrust ball bearings and thrust roller bearings. Thrust ball bearings are divided into thrust ball bearings and thrust angular contact ball bearings. The raceway ring matched with the shaft is composed of a washer with a raceway and a ball and a cage assembly, which is called a shaft ring, and the raceway ring that cooperates with the housing is called a seat ring. A two-way bearing matches the middle ring with the shaft. One-way bearing It can bear the one-way axial load and two-way bearing can bear two-way axial load. The bearing with the spherical mounting surface of the seat ring has self-aligning performance, which can reduce the influence of installation error. Such bearings are mainly used in automobile steering mechanisms and machine tool spindles.Thrust roller bearings are divided into thrust cylindrical roller bearings, thrust spherical roller bearings, thrust tapered roller bearings, thrust needle roller bearings. Thrust cylindrical roller bearings are mainly used in petroleum rigs, steel, and steel machinery. Thrust self-aligning Roller bearings this type of bearings is mainly used in hydroelectric generators, vertical motors, marine propeller shafts, tower cranes, extruders, etc. Thrust tapered roller bearings The main purpose of such bearings: unidirectional: crane hook, oil rig turn Ring. Bidirectional: Rolling mill roll neck. Planar thrust bearing mainly bears axial load in the assembly, which is widely used.
A: Abnormal noise during driving: The abnormal noise is the most important symptom when the wheel bearing is damaged. Its symptom is that the vehicle will emit a "buzzing" noise during the driving process.Body shake: If the degree of damage to the bearing is too severe, resulting in an increase in the gap, the body shake will occur during the high-speed driving of the vehicle.Unstable driving: When the front wheel bearings are excessively damaged, it will also cause the vehicle to be unstable during driving at high speed, and the power will be erratic.
A: Bearings are an important part of the field of machinery. In today's society, they are constantly developing and growing. When the bearings were invented, there were definitely not many. On the contrary, through the continuous development of society and science, the continuous emergence of new things makes the bearing look effective.It has also become increasingly rich and diverse.Bearings can be classified according to structure: plain bearings, joint bearings, rolling bearings, deep groove ball bearings, angular contact ball bearings, self-aligning ball bearings, thrust ball bearings, two-way thrust angular contact ball bearings, thrust roller bearings, needle roller bearings, self aligning ball bearings, spherical roller bearings, flange bearings, block bearings, combined bearings, linear bearings, etc., their structures are different, so the application of the bearings is also different.Bearings are divided into the above types according to the structure. The reason for the wide variety of bearings is that according to the specific needs of mechanical equipment, research and design can be conducted to meet the needs. The type of bearing is not limited to the above type. The market is changing, suppliersMarket research will also be used to meet users' business needs.Bearings are an integral part of mechanical equipment and are widely used in engines, engines, and mechanical arms. They are also an essential part of mechanical equipment.
A: 1. Clearance change failureDuring the operation of the rolling bearing, due to the influence of external or internal factors, the original fit bearing clearance is changed and the accuracy is reduced, which is called the clearance change failure.2. Contact fatigue failureContact fatigue failure refers to the failure of bearing working surface subjected to alternating stress.3. Wear failureWear failure refers to the failure caused by the continuous sliding wear of the metal on the working surface caused by the relative sliding friction between the surfaces.4. Fracture failureThe main reasons for bearing fracture failure are defects and overload. When the applied load exceeds the material strength limit and the part breaks, it is called overload fracture. The cause of the overload is mainly the sudden failure of the host or improper installation.
A: 1. The dimensional requirements are different, and the dimensional deviations (inner diameter, outer diameter, ellipse, etc.) of products with high accuracy grades are smaller than those required by bearings with lower accuracy grades;2. The required value of the bearing rotation accuracy is different. The rotation accuracy (internal radial runout, external radial runout, end face raceway runout, etc.) of products with high accuracy grades are stricter than those required by products with lower accuracy grades;3. The requirements for surface shape and surface quality are different. For products with high accuracy grades, the surface shape and surface quality (surface roughness of raceways or channels, circular deviations, groove deviations, etc.) are lower than the accuracy grades. The required value of the product should be strict;4. The materials of bearings with particularly high accuracy grades are more advantageous than those of products with general accuracy grades.
A: Journal bearingThe part of the shaft supported by the bearing is called the journal, and the part that matches the journal is called the bearing pad. The part made of a full cylindrical bearing is called the shaft sleeve. The upper part is called the bearing cover, the lower part The half is called the bearing housing. The cover and the seat are connected by studs, the joint surface of the two is positioned by the stop or the pin, and shims of different thicknesses can be placed to adjust the bearing clearance. The joint surface of most bearings is horizontal and also inclined to meet the requirement that the load direction is close to perpendicular to the joint surface. In order to facilitate the entry of lubricating oil between the friction surfaces, the bearing cover is provided with an oil injection hole, and the bearing bush has an axial oil groove for distributing lubricating oil. The bearing cover and the seat are mostly made of cast iron, and the cast steel or steel plate welded structure is used to bear the heavy load.Thrust bearingsThrust bearings are generally composed of two thrust washers or more thrust washers and several rolling elements. Generally, thrust washers are divided into shaft pieces and seat pieces. The most common type of rolling elements is made of iron or copper The quality cage is combined into a whole. This type of bearing is most commonly a steel ball thrust bearing.
A: The main alloy components of Babbitt metal are tin, lead, antimony, and copper, which are used to improve the strength and hardness of the alloy. The structural feature of the Babbitt alloy is that the hard phase particles are evenly distributed on the soft phase matrix. The soft phase matrix makes the alloy have very good embedding, compliance, and seizure resistance, and after running in, the soft matrix is concave, The hardpoints are convex outwards, which form a tiny gap between the sliding surfaces and become an oil storage space and a lubricating oil channel, which is helpful for reducing friction; the upward convex hardpoints play a supporting role and are beneficial for bearing carrying.
A: Yes, the skateboard bearing is one of the important components of skateboard sliding. When you skate on the skateboard, the bearings make the skateboard wheels move in rotation.The ball bearing is a component that supports the shaft and is used to guide the rotation of the shaft and bear the load transmitted by the shaft to the frame. Bearings are widely used and demanding matching parts and basic parts in the machinery industry. They are supporting elements for rotating shafts or movable parts of various machines. They are also supporting elements that rely on the rolling of the rolling element to rotate the main machine. It is called a mechanical joint.
A: The bearing of the iron cover has many uses, the main function is to prevent dust. The speed of the iron cover is higher. But because it is made of iron, it is not waterproof, but the rubber cover has greater friction, so the heat dissipation performance is also worse than that of the iron cover. And in terms of speed, the rubber cover is also lower than the iron cover. The temperature of the bearing is generally not higher than 150 ℃.Stamping steel plate bearing dust cover: structure to reduce the leakage of grease, and to strengthen the metal steel plate on the outer ring by stamping.
A: The crossed roller bearing is a special type bearing with inner ring split and outer ring rotating.Crossed roller bearing applicationsPrecision rotary indexing tables for machine tools, vertical and horizontal boring machines, vertical grinders, rotary surface grinders, large gear hobbing machines, guns and radar rotary tables, large radio and optical telescopes, rotary cameras, steering pivots and continuous casting machines, Highly restricted pivot microscope stage, rod center support shaft, rotary bogie, welding bracket, rotary assembly fixture, industrial robot, precision rotary table, medical instrument, measuring instrument, IC manufacturing device