Accurate Installation Can Effectively Control The Noise Of Ina Imported Bearing
Accurate Installation Can Effectively Control The Noise Of Ina Imported Bearing
2021年12月25日
Maintenance And Installation Process Of Intermediate Bearing
Maintenance And Installation Process Of Intermediate Bearing
2021年12月25日

Dimension Measurement Before Bearing Installation

Bearing Installation

When installing the rolling bearing, first fix the dial indicator on the end face of the box shell so that the contact of the dial indicator is against the raceway of the bearing shaft ring. While moving and changing the bearing, observe the pointer of the dial indicator while moving and changing. If the pointer is deflected, it is clear that the shaft ring is not perpendicular to the middle line of the shaft. Bearing Installation If the shell hole is deep, it can also be honed with an extended micrometer gauge.

This is a good way to hone the perpendicularity of the shaft ring and the shaft centerline. If the bearing device is installed reversely, not only the bearing does not work normally, but also all joint surfaces will be seriously worn. Bearing Installation Because the difference between the shaft ring and the seat ring is not obvious, special care should be taken in the assembly, and the reverse assembly should not be present.

The accurate time division of the device should be that its seat ring can actively adapt to the rolling of the rolling element and Bearing Installation ensure that the rolling element is located in the raceway of the upper and lower circles.

In addition, a clearance of 0.2-0.5mm shall be reserved between the seat ring and the bearing seat hole of the self-aligning ball bearing to compensate Bearing Installation for the error caused by inaccurate processing of parts and devices. When the middle of the bearing ring is offset during operation, this clearance can ensure its active adjustment, avoid contact friction and make it operate normally. Otherwise, the bearing will be seriously damaged.

1. Common types of rolling bearings

with race rule detection method: rolling mill bearing, joint bearing, rotary table bearing, outer spherical bearing with seat, Bearing Installation thrust ball bearing, one-way bearing, full loaded roller bearing, thrust roller bearing and linear motion bearing.

For rolling bearings with large diameter, the clearance is large, so it can be detected directly with a narrow feeler gauge. For bearings with small diameter, the clearance is small and it is inconvenient to measure Bearing Installation with a feeler gauge, but the side clearance of the bearing must be measured with a feeler gauge with appropriate thickness.

Dimension Measurement Before Bearing Installation

2. Lead pressure detection method

The lead pressing method is more accurate than the feeler gauge, but it is more troublesome. The aluminum wire used for testing should be soft, and the diameter should not be too large or too small. Bearing Installation The ideal diameter is 1.5 ~ 2 times of the gap. In practical work, soft lead wire is usually used for testing.

During the inspection, first open the bearing cover, select the lead wire with appropriate diameter, cut it into a small section 15 ~ 40mm long, Bearing Installation put it on the journal and the interface between the upper and lower bearings, cover the bearing cover, tighten the fixing bolts according to the specified torque, then loosen the bolts, remove the bearing cover, use a micrometer to detect the thickness of the flattened lead wire, and calculate the average value of the bearing top clearance.

If the top clearance is too small, a pad can be added on the joint surface of the upper and lower pads. If it is too large, the pad shall be reduced, Bearing Installation scraped or the tile shall be poured again. The circumferential surface of bearing ring shall be well supported and stressed evenly to reduce deformation and give full play to the bearing capacity of high-temperature bearing. The ferrule cannot slide along the tangent direction in its mating surface, otherwise the mating surface will be damaged.

The free end bearing must be able to adapt to the length change of the shaft and bearing seat hole, that is, it must have the ability to adapt to the swimming of the axial position within a certain range. Bearing Installation Attention must be paid to make the bearing installation and disassembly simple, labor-saving, time-saving and cost-saving.

Bearing inner diameter: before measurement, the bearing shall be installed according to the regulations and the bolts of high-temperature bearing cover shall be tightened according to the specified torque. The inner diameter gauge shall be used to measure after the reference dimension is measured with the outer diameter micrometer. The thinning area shall be avoided during measurement. The difference between the bearing inner diameter and the corresponding journal outer diameter is the fit clearance.

Coaxiality of the inner hole of the main bearing: the coaxiality error of the inner hole of the main bearing is mainly caused by the coaxiality error of the bearing hole, and the coaxiality error of the bearing hole is caused by the deformation of the cylinder block.

When the radial circular runout of the main journal is within the specified tolerance, check the bite marks of the main journal and the bearing. If the bite marks of each main high-temperature bearing are obviously inconsistent, it indicates that the coaxiality error is large, which can be solved by scraping, boring the bearing or replacing the cylinder block, otherwise

it is difficult to ensure the normal operation of the engine

1. Before installing the bearing, first use appropriate measuring tools to check the bearing seat hole and processing quality according to the provided bearing drawings and mechanical requirements, and identify the authenticity, such as dimensional accuracy, shape roughness, workmanship and bearing model to determine whether it is suitable for supporting use, If it is not a match, please determine the model immediately and replace it. Do not install it forcibly, which will directly lead to the scrapping of the machine.

2. The holes on the shaft and bearing assembly surface are bumpy, if any, burrs, rust, Or solid particles (such as debris, sand and soil), which not only makes the installation difficult, but also the installation position of the bearing is incorrect, such as the abrasive that will fall off the solid particles of the high-temperature bearing, and the working surface of the bearing that will be worn by injury or scratch during bearing rotation.

Therefore, it must be carefully inspected before installation. If these defects are found, they should be modified. For example, the use of oil to remove burrs for filing, etc., a fine abrasive cloth contact is proposed Touch marks, rust, and polish if solid particles, dirt, etc. are cleaned

3. When cleaning the installation surface, it should be cleaned with gasoline or xylene. You can use a clean rag and apply 10% thin oil, which can be clean and convenient.

4. Open the temporary installation package of high-temperature bearing, it is immersed in gasoline and other liquids, and the hand rotates gently to ensure that the cage, rolling package elements and raceway are cleaned thoroughly.

5. When cleaning the bearing, melt it with 90 ° to 100 ° hot oil first, so that the packaging and chip can be removed and seamlessly connected with the tools. Do not dig the old oil, pour in the hot oil for a few minutes, and then wash it with kerosene and gasoline. After washing, wear gloves and dry the bearing on the table with clean cloth or paper.

6. Special attention should be paid here. Never clean the sealed high-temperature bearing. The inside of the sealing chamber should remain unchanged and must not be clear.