The structure of the joint bearing is simpler than that of the rolling bearing, and it mainly consists of an inner ring having an outer spherical surface and an outer ring having an inner spherical surface. Joint bearings are generally used for low-speed oscillating motion (ie angular motion). Since the sliding surface is spherical, it can also be tilted within a certain angle range (ie, aligning motion), and the support shaft and the shaft hole are not concentric. When the degree is large, it still works normally.
Joint bearings are widely used in engineering hydraulic cylinders, forging machine tools, engineering machinery, automation equipment, automotive shock absorbers, water conservancy machinery and other industries. The joint bearing is a spherical plain bearing, and the basic type is composed of inner and outer rings having a spherical sliding spherical contact surface. Depending on its structure and type, it can withstand radial loads, axial loads, or combined loads acting in both radial and axial directions.
Because the spherical sliding contact area of the joint bearing is large, the inclination angle is large, and also because most joint bearings adopt special processing methods, such as surface phosphating, galvanizing, chrome plating or outer sliding surface lining, inserting, spraying, etc. Therefore, it has large load capacity and impact resistance, and has the characteristics of corrosion resistance, wear resistance, self-aligning, good lubrication or self-lubricating and non-lubricating dirt pollution, even if the installation is misaligned, it can work normally. Therefore, joint bearings are widely used for low-speed oscillating motions, tilting motions, and rotational motions.
2018年9月29日星期六
Introduction to the installation and disassembly of NSK bearings
NSK bearing installation
1. Before installing the imported bearing on the shaft, the fixing pin of the bearing shell 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) .
2. Apply lubricant to the bearing seat and bearing mating surface, and install the bearing into the bearing housing. Then assemble the assembled bearing with the NSK bearing housing on the shaft. Push it to the desired position for installation.
3. Do not tighten the bolts of the fixed bearing housing, so that the bearing housing can rotate in the bearing housing. Also install the other end bearing and seat on the same shaft, turn the shaft a few turns, and let the bearing itself automatically find the position. Then tighten the bearing block bolts.
4. Install the eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the inner sleeve of the bearing, and tightened by hand in the direction of rotation of the shaft. Then insert or hold the small iron rod into the counterbore on the eccentric sleeve. Iron rod. Make the eccentric sleeve securely fast, and finally lock the hexagon socket screw on the eccentric sleeve.
NSK bearing disassembly:
1. Disassembly of the outer ring
To remove the outer ring of the interference fit, install a few outer ring extrusion screw screws on the circumference of the outer casing, and tighten the screw evenly while disassembling. These screw holes are usually covered with a blind plug, a split-type NSK bearing such as a tapered roller, and a plurality of slits are provided on the outer shoulder of the outer casing, and the spacer is used, disassembled by a press, or gently tapped to remove.
2. Disassembly of cylindrical hole NSK bearing
The removal of the inner ring can be pulled out by the pressure machine. At this point, pay attention to let the inner ring withstand its pulling force. The inner ring of large NSK bearings is dismantled by hydraulic method. Oil pressure is applied through an oil hole provided on the shaft to make it easy to pull. The NSK bearing with a large width is used in combination with the hydraulic chucking method for the disassembly work. The inner ring of the NU type and NJ type cylindrical roller NSK bearings can be removed by induction heating. A method of heating a part in a short time to expand and pull the inner ring.
3, the removal of the tapered hole NSK bearing
Disassemble the relatively small NSK bearing with adapter sleeve, support the inner ring with the block fastened on the shaft, turn the nut back a few times, and use the ram to knock and disassemble. Large NSK bearings are easier to disassemble by hydraulic pressure. The oil is pumped in the oil hole on the taper shaft to expand the inner ring and remove the NSK bearing. In operation, there is a possibility that the NSK bearing suddenly comes out. It is better to use the nut as a block.
1. Before installing the imported bearing on the shaft, the fixing pin of the bearing shell 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) .
2. Apply lubricant to the bearing seat and bearing mating surface, and install the bearing into the bearing housing. Then assemble the assembled bearing with the NSK bearing housing on the shaft. Push it to the desired position for installation.
3. Do not tighten the bolts of the fixed bearing housing, so that the bearing housing can rotate in the bearing housing. Also install the other end bearing and seat on the same shaft, turn the shaft a few turns, and let the bearing itself automatically find the position. Then tighten the bearing block bolts.
4. Install the eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the inner sleeve of the bearing, and tightened by hand in the direction of rotation of the shaft. Then insert or hold the small iron rod into the counterbore on the eccentric sleeve. Iron rod. Make the eccentric sleeve securely fast, and finally lock the hexagon socket screw on the eccentric sleeve.
NSK bearing disassembly:
1. Disassembly of the outer ring
To remove the outer ring of the interference fit, install a few outer ring extrusion screw screws on the circumference of the outer casing, and tighten the screw evenly while disassembling. These screw holes are usually covered with a blind plug, a split-type NSK bearing such as a tapered roller, and a plurality of slits are provided on the outer shoulder of the outer casing, and the spacer is used, disassembled by a press, or gently tapped to remove.
2. Disassembly of cylindrical hole NSK bearing
The removal of the inner ring can be pulled out by the pressure machine. At this point, pay attention to let the inner ring withstand its pulling force. The inner ring of large NSK bearings is dismantled by hydraulic method. Oil pressure is applied through an oil hole provided on the shaft to make it easy to pull. The NSK bearing with a large width is used in combination with the hydraulic chucking method for the disassembly work. The inner ring of the NU type and NJ type cylindrical roller NSK bearings can be removed by induction heating. A method of heating a part in a short time to expand and pull the inner ring.
3, the removal of the tapered hole NSK bearing
Disassemble the relatively small NSK bearing with adapter sleeve, support the inner ring with the block fastened on the shaft, turn the nut back a few times, and use the ram to knock and disassemble. Large NSK bearings are easier to disassemble by hydraulic pressure. The oil is pumped in the oil hole on the taper shaft to expand the inner ring and remove the NSK bearing. In operation, there is a possibility that the NSK bearing suddenly comes out. It is better to use the nut as a block.
2018年9月27日星期四
Maintenance of forklift clutch release bearing
The engine does not disintegrate the oil filling method. First open the clutch cover to check the wear of the separated bearing. If it is confirmed that the bearing is not damaged or the wear is not over the limit, remove the clutch pedal, adjust the connecting rod pin, and return the separating bearing and its seat back. In the final position, fill the hole in the bearing housing with a grease gun until the bearing overflows. Then turn the bearing slightly, refill the oil, repeat the above work until there is a little butter around the bearing, and then turn the bearing. Observe the amount of oil. If there is resistance to the rotation of the bearing, it is proved that the bearing is filled with butter. Then remove a small amount of butter from the separation housing and reinstall the removed pin and clutch cover.
The engine oil disintegration method disassembles the engine to expose the assembly of the separation bearing and the bearing housing, and uses a grease gun to fill the small oil hole below the inner ring of the separation bearing housing. When the bearing has a butter overflow, the bearing is rotated until the bearing has a ring. The butter can overflow.
The engine oil disintegration method disassembles the engine to expose the assembly of the separation bearing and the bearing housing, and uses a grease gun to fill the small oil hole below the inner ring of the separation bearing housing. When the bearing has a butter overflow, the bearing is rotated until the bearing has a ring. The butter can overflow.
What are the characteristics and uses of roller bearings?
Roller and raceway are in line contact or repair line contact, and have large radial load capacity, suitable for those subjected to heavy load and impact load.
2: The friction coefficient is small, suitable for those high speeds, and the limit speed is close to the deep groove ball bearing.
3: N-type and NU-type can move axially, can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error, and can be used as a free end support.
4: The machining requirements for the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.
5: The inner ring or the outer ring can be separated to facilitate the installation and disassembly of the bearing.
The main uses are: large and medium-sized motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, rolling mills, vibrating screens, and lifting and transporting machinery.
Both ball bearings and roller bearings are rolling bearings. The simplest one is that the rolling elements are balls, which are steel balls. The other rolling element is a steel column.
Ball bearing:
One type of rolling bearing, the ball is installed in the middle of the inner steel ring and the outer steel ring, and can withstand large loads. Also called ball bearings.
The ball bearing mainly consists of four basic components: ball, innerring, outerring and cage retainer, as shown. General industrial ball bearings meet the AISI 52100 standard. Balls and rings are usually made of high chrome steel with a Rockwell C-scale hardness of between 61 and 65. The hardness of the retainer is lower than that of the ball and the ring, and the material is metal (such as: medium carbon steel, aluminum alloy) or non-metal (such as: Teflon, PTEF, polymer material). Rolling bearings have less rotational frictional resistance than journal bearings, so at the same speed, the temperature due to friction is lower.
Roller bearings:
The rolling element is a radial rolling bearing of a cylindrical roller. Cylindrical rollers and raceways are line contact bearings. Load capacity, mainly bear radial load. The rolling element has little friction with the ferrule rib and is suitable for high speed rotation. According to the ferrule with or without ribs, there are single row bearings such as NU, NJ, NUP, N, NF, and double row bearings of NNU and NN. The bearing is a structure in which the inner ring and the outer ring are separable. Cylindrical roller bearings with no ribs on the inner or outer ring, the inner and outer rings can move relative to the axial direction, so they can be used as free end bearings. A cylindrical roller bearing with a single rib on one side of the inner and outer rings and a single rib on the other side can withstand a certain degree of axial load in one direction. Steel stamping cages or copper alloy cages are generally used. However, some use polyamide shaped cages.
1. Roller and raceway are in line contact or repair line contact, and have large radial load capacity, suitable for heavy load and impact load.
2. The friction coefficient is small, suitable for high speed, and the limit speed is close to the deep groove ball bearing.
3. The N-type and NU-type can move axially, can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error, and can be used as a free end support.
4. The machining requirements for the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.
5. The inner or outer ring can be separated for easy installation and disassembly.
Main uses: large and medium-sized motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, rolling mills, vibrating screens, and lifting and transportation machinery.
2: The friction coefficient is small, suitable for those high speeds, and the limit speed is close to the deep groove ball bearing.
3: N-type and NU-type can move axially, can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error, and can be used as a free end support.
4: The machining requirements for the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.
5: The inner ring or the outer ring can be separated to facilitate the installation and disassembly of the bearing.
The main uses are: large and medium-sized motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, rolling mills, vibrating screens, and lifting and transporting machinery.
Both ball bearings and roller bearings are rolling bearings. The simplest one is that the rolling elements are balls, which are steel balls. The other rolling element is a steel column.
Ball bearing:
One type of rolling bearing, the ball is installed in the middle of the inner steel ring and the outer steel ring, and can withstand large loads. Also called ball bearings.
The ball bearing mainly consists of four basic components: ball, innerring, outerring and cage retainer, as shown. General industrial ball bearings meet the AISI 52100 standard. Balls and rings are usually made of high chrome steel with a Rockwell C-scale hardness of between 61 and 65. The hardness of the retainer is lower than that of the ball and the ring, and the material is metal (such as: medium carbon steel, aluminum alloy) or non-metal (such as: Teflon, PTEF, polymer material). Rolling bearings have less rotational frictional resistance than journal bearings, so at the same speed, the temperature due to friction is lower.
Roller bearings:
The rolling element is a radial rolling bearing of a cylindrical roller. Cylindrical rollers and raceways are line contact bearings. Load capacity, mainly bear radial load. The rolling element has little friction with the ferrule rib and is suitable for high speed rotation. According to the ferrule with or without ribs, there are single row bearings such as NU, NJ, NUP, N, NF, and double row bearings of NNU and NN. The bearing is a structure in which the inner ring and the outer ring are separable. Cylindrical roller bearings with no ribs on the inner or outer ring, the inner and outer rings can move relative to the axial direction, so they can be used as free end bearings. A cylindrical roller bearing with a single rib on one side of the inner and outer rings and a single rib on the other side can withstand a certain degree of axial load in one direction. Steel stamping cages or copper alloy cages are generally used. However, some use polyamide shaped cages.
1. Roller and raceway are in line contact or repair line contact, and have large radial load capacity, suitable for heavy load and impact load.
2. The friction coefficient is small, suitable for high speed, and the limit speed is close to the deep groove ball bearing.
3. The N-type and NU-type can move axially, can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error, and can be used as a free end support.
4. The machining requirements for the shaft or the seat hole are relatively high, and the relative deflection of the outer ring axis after the bearing is installed must be strictly controlled to avoid contact stress concentration.
5. The inner or outer ring can be separated for easy installation and disassembly.
Main uses: large and medium-sized motors, rolling stock, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, rolling mills, vibrating screens, and lifting and transportation machinery.
Loading and failure of rolling bearings
The contact load and stress change when the rotating ring and the rolling element pass through the points of the bearing zone; and the contact load and stress at each contact point are characterized by pulsating circulation; the unloading zone is not loaded;
The load and stress of each point of the fixed ring are unequal, and the contact load and stress at each bearing point are characterized by the same pulsation cycle, but the values of the amplitude are different;
The maximum value of the load at the lowermost end is, for deep groove ball bearings (class 6): F0 = (4.37 / Z) Fr.
Failure form of rolling bearing
(1) For normal running bearings (10 r/min<n<nlim) - fatigue pitting of inner and outer rings and rolling elements;
(2) For bearings that are stationary or have low speed (n ≤ 10 r/min) or intermittent oscillations - plastic deformation of the inner and outer rings and rolling elements;
(3) Unavoidable friction and wear of inner and outer rings and rolling elements;
3. Design criteria for rolling bearings
(1) For normal running bearings - to prevent fatigue pitting, based on fatigue strength calculation, calculate the life;
(2) For low-speed bearings, or bearings that are subjected to continuous loads or subjected to intermittent loads without rotation, it is required to control plastic deformation, - to calculate static strength;
(3) For high-speed running bearings - in addition to the life calculation, the limit speed of the bearing must also be checked.
The load and stress of each point of the fixed ring are unequal, and the contact load and stress at each bearing point are characterized by the same pulsation cycle, but the values of the amplitude are different;
The maximum value of the load at the lowermost end is, for deep groove ball bearings (class 6): F0 = (4.37 / Z) Fr.
Failure form of rolling bearing
(1) For normal running bearings (10 r/min<n<nlim) - fatigue pitting of inner and outer rings and rolling elements;
(2) For bearings that are stationary or have low speed (n ≤ 10 r/min) or intermittent oscillations - plastic deformation of the inner and outer rings and rolling elements;
(3) Unavoidable friction and wear of inner and outer rings and rolling elements;
3. Design criteria for rolling bearings
(1) For normal running bearings - to prevent fatigue pitting, based on fatigue strength calculation, calculate the life;
(2) For low-speed bearings, or bearings that are subjected to continuous loads or subjected to intermittent loads without rotation, it is required to control plastic deformation, - to calculate static strength;
(3) For high-speed running bearings - in addition to the life calculation, the limit speed of the bearing must also be checked.
The working principle of bearing heater and its eight characteristics
The bearing heater consists of a dry self-cooling power frequency induction heating device referred to as the host and control equipment.
Bearing heater working principle:
1. Short-circuit heating: The main unit is a special-structure transformer. The movable yoke is used to directly pass the sleeve bearing or other heated workpiece. During operation, the main power supply of the bearing heater is turned on, and the short-circuit current is induced in the workpiece (corresponding to the secondary winding) and heated.
2. Place the yoke on the end face of the main iron core.
3. Check that the wiring between the plug and the socket is the same, the grounding should be good, and then insert the plug into the power socket with the control switch.
4. Turn the function selection switch to the manual position and close the power supply. At this time, the red indicator light is on.
5. Press the start button, the main unit is powered on, then the green indicator light is red and the light is off; press the stop button, the red light is on and the green light is off. At this point, debugging is complete and ready for use.
Operating procedures:
1. According to the inner diameter of the bearing, select the corresponding yoke (see Table 2), and place the yoke of the bearing on the string on the end face of the main iron core, which should be square.
2. During the heating process, measure the temperature rise at the end of the bearing inner ring with a point thermometer. When the temperature rise meets the requirements, look at the time count, stop heating, remove the yoke, and remove the bearing to assemble.
3. Continuously heat the bearing of the same specification, set the function selection switch to the time control position, set the heating time, and automatically turn off the power when the bearing is heated to the set time.
4. After the work is completed, turn the function selection switch to the stop position and cut off the position.
Eight characteristics of bearing heater
1. The heating speed is fast, and the temperature display can control the heating process.
2, the new eddy current induction design, using the international advanced "FuzzyControl" and "NeuralNetowrk" technology.
3, can work continuously, output power is high, high efficiency
4, the heating process is safe and reliable, the British Royal Sun United Insurance Company underwriting.
5, can be heated with sealed bearings (ZZ, 2RS)
6, rotating (hydraulic) rocker arm or hinged heating rod design, more convenient to use.
7, heating process can display heating time
8, no open fire, no pollution, environmental protection, no accidents.
Bearing heater range
The bearing heater is suitable for machinery manufacturing and maintenance in the fields of power plants, textile mills, paper making, chemical industry, petroleum, machinery, mining machinery, maintenance of wind power industry, etc. It can be used as bearings, connectors, gears, mechanical bushings, etc. The workpiece is heated and automatically demagnetized, so that the workpiece is cylindrically expanded to meet the requirements of interference assembly. The heater is controlled by microcomputer, which can automatically detect the equipment failure, automatically adjust the heater power, and soft start/stop.
Bearing heater working principle:
1. Short-circuit heating: The main unit is a special-structure transformer. The movable yoke is used to directly pass the sleeve bearing or other heated workpiece. During operation, the main power supply of the bearing heater is turned on, and the short-circuit current is induced in the workpiece (corresponding to the secondary winding) and heated.
2. Place the yoke on the end face of the main iron core.
3. Check that the wiring between the plug and the socket is the same, the grounding should be good, and then insert the plug into the power socket with the control switch.
4. Turn the function selection switch to the manual position and close the power supply. At this time, the red indicator light is on.
5. Press the start button, the main unit is powered on, then the green indicator light is red and the light is off; press the stop button, the red light is on and the green light is off. At this point, debugging is complete and ready for use.
Operating procedures:
1. According to the inner diameter of the bearing, select the corresponding yoke (see Table 2), and place the yoke of the bearing on the string on the end face of the main iron core, which should be square.
2. During the heating process, measure the temperature rise at the end of the bearing inner ring with a point thermometer. When the temperature rise meets the requirements, look at the time count, stop heating, remove the yoke, and remove the bearing to assemble.
3. Continuously heat the bearing of the same specification, set the function selection switch to the time control position, set the heating time, and automatically turn off the power when the bearing is heated to the set time.
4. After the work is completed, turn the function selection switch to the stop position and cut off the position.
Eight characteristics of bearing heater
1. The heating speed is fast, and the temperature display can control the heating process.
2, the new eddy current induction design, using the international advanced "FuzzyControl" and "NeuralNetowrk" technology.
3, can work continuously, output power is high, high efficiency
4, the heating process is safe and reliable, the British Royal Sun United Insurance Company underwriting.
5, can be heated with sealed bearings (ZZ, 2RS)
6, rotating (hydraulic) rocker arm or hinged heating rod design, more convenient to use.
7, heating process can display heating time
8, no open fire, no pollution, environmental protection, no accidents.
Bearing heater range
The bearing heater is suitable for machinery manufacturing and maintenance in the fields of power plants, textile mills, paper making, chemical industry, petroleum, machinery, mining machinery, maintenance of wind power industry, etc. It can be used as bearings, connectors, gears, mechanical bushings, etc. The workpiece is heated and automatically demagnetized, so that the workpiece is cylindrically expanded to meet the requirements of interference assembly. The heater is controlled by microcomputer, which can automatically detect the equipment failure, automatically adjust the heater power, and soft start/stop.
61828-Y Deep groove ball bearings
| Mass | ||
| Basic dynamic load rating, radial | ||
| Basic static load rating, radial | ||
| Fatigue limit load, radial | ||
| Limiting speed | ||
| Reference speed | ||
| Calculation factor |
61908-2RSR Deep groove ball bearings
| Mass | ||
| Basic dynamic load rating, radial | ||
| Basic static load rating, radial | ||
| Fatigue limit load, radial | ||
| Limiting speed | ||
| Calculation factor |
61908-2Z Deep groove ball bearings
| Mass | ||
| Basic dynamic load rating, radial | ||
| Basic static load rating, radial | ||
| Fatigue limit load, radial | ||
| Limiting speed | ||
| Reference speed | ||
| Calculation factor |
Bearing Kingdom www.bearingkingdom.com
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Our advantage:
As a leading industrial distributor, we strive to transfer impact and raise social, ethical, and environmental standards wherever we do business. We value our relationships with our Suppliers, Customers, Employees, and Community. The brands we represent and the service we provide every day to our customers reflect our commitment to do things the right way and to do them well.
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Our talent pool is broad and diverse, and we believe in developing our people so they can reach their potential in providing superior customer service. Related programs and resources support our employees in attaining this achievement.
Our advantage:
We have more than 70 partners and factories all over the world;
they all have qualified quality inspection certificates and can provide certificates such as a certificate of origin, quality inspection certificate, and environmental protection certificate;
We can find all kinds of bearings for you; here you can specify the country, specify the price, we will match the seller according to your requirements;
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If you have an inventory and a producing sophisticated factory, then you can join us and become our partner supplier;
61810-Y Deep groove ball bearings
| Mass | ||
| Basic dynamic load rating, radial | ||
| Basic static load rating, radial | ||
| Fatigue limit load, radial | ||
| Limiting speed | ||
| Reference speed | ||
| Calculation factor |
61809-Y Deep groove ball bearings
| Mass | ||
| Basic dynamic load rating, radial | ||
| Basic static load rating, radial | ||
| Fatigue limit load, radial | ||
| Limiting speed | ||
| Reference speed | ||
| Calculation factor |
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