The bearing is used to support the parts, but also to support the shaft on the rotation of the parts, the type of bearing friction properties: bearing and rolling bearings; according to the direction of the load points: a radial bearing, to promote the bearing, Wait.
1, the assembly of bearings
Bearing is a sliding friction properties of the bearing, characterized by smooth work, reliable noise, can withstand heavy loads and greater impact load, according to the different forms of structure can be divided into integral, split and tile and so on.
(1) assembly of integral bearings
Integral bearings commonly known as the sleeve, Bearings but also the most simple form of bearing, the main use of pressure and hammer method to assemble, special occasions using hot-loading method, the majority of the sleeve is made of copper or cast iron, assembly should be Carefully, can be used wood hammer or hammer pad wood block hit the way of assembly, the size of the larger tolerance when the pressure with a press press. Whether the knock or press must be prevented from tilting, after assembly, the oil groove and oil hole should be in the required position.
After the assembly of the deformation of the bearing, should be trimmed hole, the smaller the available reamer cut, the larger size is used to scraping. At the same time pay attention to control the gap with the shaft in the tolerance range, in order to prevent the rotation of the sleeve work, the sleeve and the box on the contact surface with locating pin or riding screws. As the box and the sleeve material hardness is not the same as drilling, Bearings it is easy to bias the side of the soft material, the solution: First, before drilling with the hard material punching the side of the punch, the second is to use a short drill to increase the drill Hole when the drill bit steel.
(2) the assembly of split bearings
Split bearings, also known as off the bearing, with a simple structure, easy adjustment and disassembly characteristics, in the bearing pad with two bearings, Bearings in the joint with a gasket to adjust a reasonable gap.
① bearing and bearing body assembly
The contact between the upper and lower bearings and the bearing body must be good, if not meet the requirements of thick-walled bearing bearing the hole as a benchmark, scraping the back of the bearing, while the bearing should be close to both ends of the bearing at both ends. Thin-walled tile as long as the bearing in the sub-face than the bearing body in the sub-surface can be higher than 0.1mm, do not scratch.
② bearing installed in the bearing body, regardless of radial or axial are not allowed to have displacement, usually with the end of the bearing pad to stop positioning or positioning pin positioning.
③ bearing with scraping
The open pad is generally used with its matching shaft research points, are generally scraping the bearing pad, and then scraping the bearing pad, in order to improve efficiency in the scraping of the bearing pad can not be installed when the bearing tile and cover, the current bearing contact point basic Meet the requirements, and then the upper bearing and the cover on the compression, and scraping on the bearing pad, Bearings the further correction of the next bearing contact point. The degree of tightness of the shaft can be adjusted by changing the thickness of the shroud. When the bearing cap is tightened, the shaft can be easily rotated without a clear clearance, and the contact point meets the requirements.
④ bearing clearance measurement
The size of the bearing clearance can be adjusted by the gasket at the middle face, or by the direct scratch pad. Measure the bearing clearance is usually used to lead the lead method, take a few paragraphs larger than the bearing gap lead wire, on the journal and the middle surface, and then tighten the nut to make the middle face pressed, and then unscrew the nut, remove the bearing cover, Remove the flattened lead wire, each take a section to measure the thickness of the micrometer, according to the average thickness of the lead wire can know the bearing clearance. General bearing clearance should be shaft diameter of 1.5 ‰ -2.5 ‰ (mm), a larger diameter to take a smaller gap value. If the shaft diameter is 60mm bearing clearance should be between 0.09-0.15mm.