Bearing device common sense
2019-10-07 15:04:59
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Bearing device common sense
Source: China Bearing Network Time: 2014-07-12
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Whether the bearing device is good or bad; will affect the accuracy, life and function of the bearing. Therefore, please fully study the bearing device; that is, please follow the operating specifications including the following items for the bearing device.
1. Clear the bearing and related parts to the grease-smooth bearing and the double-sided oil seal or dust cover; the seal ring bearing device does not need to be removed.
Second, to view the dimensions and finishing conditions of the associated parts. III. Device The bearing device should be based on the bearing layout; the size of the scale and the cooperative nature of the bearing components; the pressure should be added directly to the end face of the ferrule; Body transfer pressure; bearing devices usually use the following methods:
a. Pressing the inner ring of the cooperative bearing and the shaft to make a tight cooperation; when the outer ring and the bearing housing hole are loosely engaged; the bearing can be first pressed on the shaft by the press; then the shaft is loaded into the bearing housing hole together with the bearing; Installed on the end face of the inner ring of the bearing; pad a device casing made of soft metal material (copper or mild steel); the inner diameter of the casing of the device should be slightly larger than the diameter of the journal; the diameter of the outer diameter should be slightly smaller than the inner ring of the bearing庋乖诒 庋乖诒 3 苌. The outer ring of the bearing and the bearing housing hole tightly cooperate; when the inner ring and the shaft are loosely cooperative; the bearing can be pressed into the bearing housing hole first; Less than the diameter of the seat hole. If the bearing ring is tightly engaged with the shaft and the seat hole; the inner ring and the outer ring of the device should be pressed together into the shaft and the seat hole; the layout of the device bushing should be able to hold the inner ring of the bearing together and The end face of the outer ring.
b. Heating cooperation through heated bearings or bearing housings; using thermal expansion to transform tight cooperation into loose cooperation device method. It is a common and labor-saving device method. This method is suitable for the device with large interference bearing; before the hot loading The bearing or the ferrule of the separate bearing is placed in the fuel tank and heated evenly at 80-100 ° C; then it is taken out from the oil and quickly loaded onto the shaft; in order to avoid the cooling, the end face of the inner ring and the shoulder are not tight; after the bearing is cooled, Then the axial fastening is carried out. When the outer ring of the bearing is tightly cooperated with the bearing seat made of light metal; the hot-packing method of the heated bearing seat is adopted; the cooperating surface can be prevented from being scratched. When the bearing is heated by the oil tank; at a certain interval from the bottom of the box There should be a grid; perhaps the bearing should be hung with a hook; the bearing should not be placed on the bottom of the box; to prevent sinking impurities from entering the bearing or uneven heating; a thermometer is necessary in the fuel tank; strictly control the oil temperature should not exceed 100 °C; The tempering effect of the attack; the hardness of the ferrule is reduced.
c. The tapered bore bearing of the tapered bore bearing can be mounted directly on the tapered journal; or the tapered surface of the adapter sleeve and the withdrawal sleeve; the degree of tightness of the cooperation can be measured by the reduction of the radial clearance of the bearing; Therefore, the radial clearance of the bearing should be measured before the device; during the installation process, the clearance should be measured to reach the required reduction of the clearance; the lock nut device is usually used in the device; the heating device can also be used.
d. Thrust bearing device The complete cooperation of the thrust bearing with the shaft is usually a transitional cooperation; the cooperation between the race and the bearing housing hole is usually the cooperation of the gap; therefore, the bearing is easier to install; the shaft spring of the double-way thrust bearing should be fixed on the shaft. ; to avoid relative to the shaft transformation. Bearing device method; usually under the condition that the shaft rotation is mostly; thus the cooperation between the inner ring and the shaft is a win-win cooperation; the cooperation between the bearing outer ring and the bearing chamber is the cooperation of the gap.
Fourth, after the bearing device view five, the smoothing agent to increase the high-speed fine angle touch ball bearing device:
High-speed fine-angle touch ball bearing; it is mainly used for high-speed rotating occasions with light load; high-precision bearing, high-speed, low-temperature low-rise oscillation and inevitable service life. It is often used as a support device for high-speed electric spindles; It is the key supporting part of the high-speed electric spindle of the internal and external surface grinding machine.
Primary technical goals:
1. Bearing accuracy target: Beyond GB/307. 1-94 P4 accuracy
2. High-speed function target: dmN value 1. 3~1. 8x 106 /min
3. Lifespan (even): >1500 h The use of high-speed fine-angle touch ball bearings has a lot of relationship with the device; the following should be emphasized:
1. The bearing device shall be carried out in a dust-free and clean room; the bearing shall be carefully selected; the bearing spacer shall be ground; in the condition of maintaining the height of the inner and outer ring spacers; the parallelism of the spacer shall be controlled below 1 um.
2. The bearing device should be cleaned before cleaning; when the inner ring slope is facing upwards; the hand is sensitive; there is no blockage; after drying; put a specified amount of oil; if the oil mist is smooth, a small amount of oil mist oil should be placed.
3. The bearing device should use special things; the force is even; the hitting is prohibited.
4. Bearing storage should be hygienic and ventilated; no corrosive gas; relative humidity should not exceed 65%; long-term storage should be regularly rust-proof.
Tapered roller bearing, water pump shaft bearing device:
First, the bearing device: The bearing device must be carried out under boring and hygienic environmental conditions. Before the device, carefully check the cooperation appearance of the shaft and the outer casing, the end face of the shoulder, the groove and the processing quality of the joint appearance. All cooperation It is necessary to carefully remove and remove the burrs on the outside; it is necessary to remove the sand from the unprocessed appearance of the casting.
Before the bearing device, it should be cleaned with gasoline or kerosene; it should be used after boring; and it should be excellent and smooth; the bearing should be smooth and smooth; the oil should be smooth. When the grease is smooth, it should be free from impurities, oxidation and rust. Smooth grease with excellent function such as extreme pressure. Smooth grease filling capacity is 30%-60% of bearing and bearing housing volume; not too much. Double row tapered roller bearing and water pump shaft bearing with sealing layout have been filled with smooth grease Users can use it directly; no more can be cleared.
When bearing the device; it is necessary to apply equal pressure on the circumference of the end face of the ferrule; press the ferrule; do not directly hit the bearing end face with the number one thing; avoid damage to the bearing. Under the condition of small interference; Press the sleeve on the end face of the bearing ring at normal temperature; hit the sleeve with the head; press the sleeve evenly through the sleeve. If it is a large-scale device; use a hydraulic press. When pressing in; ensure the outer ring end face and The shoulder end face of the outer casing; the inner ring end face and the end face of the shaft shoulder are pressed tightly; no gap is allowed.
When the interference is large; you can use oil bath heating or induction heating to install the device; the heating temperature is 80 °C-100 °C; the maximum can not exceed 120 °C. Together; use nuts or other appropriate means to tighten the bearing ; to avoid the shortening of the width direction of the bearing after cooling, resulting in a gap between the ferrule and the shoulder.
The single-row tapered roller bearing device should be adjusted for the clearance at the end. The clearance value should be determined in detail according to the different operating conditions and the cooperative interference amount. If necessary, the experimental determination should be made. Double row tapered roller bearing And the pump shaft bearing has been adjusted at the factory clearance; the device does not need to be adjusted.
After the bearing device, the rotation test should be carried out; firstly, it should be used for rotating shaft or bearing box; if it is not abnormal; it will be driven without load and low speed by power; then gradually increase the rotation speed and load according to the working condition; and detect noise, oscillation and temperature rise. Found abnormal; should stop the operation and check. After the operation experiment is normal, it can be delivered.
Second, the disassembly of the bearing: After the bearing is removed, it is intended to be used continuously; the appropriate disassembly should be used. The ferrule of the interference cooperation should be dismantled; only the pulling force should be added to the ferrule; Pass the disassembly force; otherwise the roll and raceway will be crushed.
Third, the operating environment of the bearing: According to the application site and operating conditions and environmental conditions to select the standard scale, precision; cooperative bearing is the condition to ensure the bearing life and feasibility.
1. Application: Tapered roller bearings are suitable for accepting radial and axial combined loads with radial loads; usually used with two sets of bearings; first and foremost for the front and rear hubs of the car, automatic bevel gears, differential Transmission parts such as reducer and reducer.
2, promise speed: in the correct, smooth and outstanding environment; the maximum speed of the bearing is 0. 3-0. 5 times. Under normal conditions; the maximum speed of 0.2 times is the most suitable.
3, promised slanting angle: Tapered roller bearings usually do not allow the shaft to be skewed relative to the housing hole; if there is skew; the maximum does not exceed 2'.
4, promise temperature: in the normal load; and the smoothing agent has high temperature resistance; and smooth and abundant conditions; usually the bearing promises to work at -30 ° C -150 ° C ambient temperature.
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