The correct bearing and shaft assembly techniques

2020 - the correct bearing and shaft assembly skills 06 - 23 bearing is used to support components, is also used to support shaft rotary parts, bearing types according to the nature of the friction points: sliding bearing and rolling bearing; According to the direction of the load points: is there a centripetal bearings, bearings, angular contact bearings, etc. 1, sliding bearing assembly sliding bearing is a kind of sliding bearing grinding quality, characteristic is stable, reliable, low noise, can withstand heavy loads and large impact load, according to different can be divided into the integral structure, split and tile type, etc. ( 1) Integral sliding bearing assembly integral sliding bearing commonly known as the shaft sleeve, a kind of form is also the most simple of the sliding bearing, mainly adopt the method of pressure into and hammer to assembly, special occasions with hot pack, most of the collar is made of copper or iron, should be careful when assembling, use wooden hammer or hammer cushion block and the method of assembly and interference with press pressure into the larger size tolerance. Regardless of the type or pumped must prevent tilt, after assembly, oil groove and oil hole should be in the required position. Should be done after the deformation of the bearing assembly, inner hole, smaller reamer cut, available size larger by scraping. At the same time pay attention to control and shaft fit clearance in tolerance range, in order to prevent the collar job rotation, shaft sleeve and the contact surface with a locating pin or the place of box body is various, screws. Because of the housing and shaft sleeve material hardness is not the same as drilling, it is easy to make bit towards the soft material side, the solution: one is before drilling by punching, hard material with sample 2 it is to use short bit, in order to increase rigidity of drilling bit. ( 2) Split bearing assembly split bearing is also called the split bearing, has the advantages of simple structure, convenient adjustment and remove, on bearing two pieces of bearing bush, in joint with the gasket to adjust the reasonable clearance. (1), the assembly of bearing and the bearing body up and down two bearing contact with the bearing hole in the body must be good, if do not conform to the requirements in bearing hole as a benchmark in the body, the thick wall bearing blow grind bearing bush back, at the same time, should make the ends of the bearing bush steps close to both ends of the bearing body. Thin wall tile as long as the bearing shell split 0 higher than points in the surface of the bearing. About 1 mm, not compulsory. (2) the bearing is installed in the bearing body, no matter the radial or axial displacement, are not allowed to have usually ends with bearing bush to stop the steps of positioning or dowel locating. (3) the bearing bush faced to open four commonly used matching shaft research point, is generally lower bearing, and then scrape on bearing, in order to improve the efficiency when scraping the lower bearing don't mount bearing bushing and the cover, the basic requirements of the bearing contact, then the bearing shell and cover pressure, scraping the research on the bearing shell, further revised lower bearing contact points. Faced the tightness of the axis can be with the increase of the number of scraping, by changing the shim thickness adjustment. After the bearing cap fastening, shaft can easily turn without obvious gap, conform to the requirements of faced to complete contact point. (4) measuring the size of the bearing clearance of bearing clearance can be adjusted through the split of gasket, also may be achieved through direct repair scraping the bearing shell. Measurement usually USES the pressure bearing clearance lead method, take some lead wire diameter greater than the bearing clearance, in the journal and points on the surface, then tighten the nut to split pressure, then fix the nut, remove the bearing cover, carefully remove the squished lead wire, one from each section of the micrometer to measure thickness, according to the average thickness of the lead wire can know the bearing clearance. General bearing clearance should be 1 the diameter of the shaft. 5‰ - 2. 5‰ （ mm） For the larger diameter, smaller clearance value. Such as is 60 mm shaft diameter bearing clearance should be 0. 09 - 0. Between 15 mm.