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Assembly methods of split bearings

wallpapers Industry 2020-12-09
Split bearings have the characteristics of simple structure and convenient adjustment and disassembly. Two bearing shells are set on the bearing shell, and washers are used at the joints to adjust a reasonable gap.
1. Assembly of bearing shell and bearing body
The upper and lower bearing bushes must be in good contact with the inner hole of the bearing body. If it does not meet the requirements, please use the inner hole of the thick-walled bearing bush as a reference and scratch the back of the bearing bush. At the same time, the steps at both ends of the bearing bush should be close to the bearing body. Thin-walled bushings only need to make the middle parting surface of the bearing bushing about 0.1mm higher than the middle parting surface of the bearing body without scratching.
2. The bearing bush
The bearing bush is installed in the bearing body and is not allowed to move in the radial or axial direction. The steps at both ends of the bearing bush are usually used to stop positioning or positioning pins.
3. Scratch the bushing
Split bearing shells usually use matching shaft grinding points. Usually, the bearing shell is scratched first, and then the bearing shell. In order to improve efficiency, the bearing shell and cover are not installed when scraping the bearing shell. When the contact point of the front bearing shell basically meets the requirements, the upper bearing bush and the upper cover are tightly pressed, and after the upper bearing bush is scraped off, the contact point of the lower bearing bush is further corrected. As the number of scratches increases, the tightness of the shaft can be adjusted by changing the thickness of the washer. After tightening the bearing cap, the shaft can be easily rotated without an obvious gap, and when the contact point reaches the requirement, the scraping is completed.
4. Measurement of bearing clearance
The size of the bearing gap can be adjusted by the spacer on the central separating surface, or it can be obtained by directly scraping the bearing bush. The pressure guiding method is usually used to measure the bearing clearance. Take several wires with a diameter larger than the bearing gap and place them on the journal and the center separation surface. Then tighten the nut to compress the center partition surface, then unscrew the nut and remove the bearing cap. Take out the flat wire and measure the thickness of each part with a micrometer. The bearing clearance can be known from the average thickness of the wire. Generally, the clearance of the bearing should be 1.5‰-2.5‰ (mm) of the shaft diameter. The larger the diameter, the smaller the gap value. If the shaft diameter is 60mm, the bearing clearance should be between 0.09-0.15mm.

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