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Bearing With A Simple Structure, Easy Adjustment And Disassembly
Jun 26, 2017

The bearing is used to support the parts, but also to support the shaft on the rotation of the parts, the type of bearing by the friction properties: a sliding bearing and rolling bearings; according to the direction of load points: a radial bearing, to promote the bearing, Bearings and so on.

1, the assembly of sliding bearings

Sliding bearing is a kind of sliding friction bearing, which is characterized by stable operation, reliable noise is small, can withstand heavy load and large impact load, according to the structure of different forms can be divided into integral, split and tile and so on.

(1) assembly of integral plain bearings

The overall type of sliding bearings commonly known as sleeve, sliding bearings is the most simple form, 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, Should be careful, can be used wood hammer or hammer pad wood block hit the method 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, it is easy to bias the side of the soft side of the drill, the first way to drill with the hard material while punching the hard material, 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, 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 pressure, and scraping on the bearing pad, 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.

2, the assembly of rolling bearings

Rolling bearings with small friction, small axial size, easy to replace, easy maintenance and so on.

(1) the technical requirements of the assembly

① Rolling bearings marked with the end of the code should be installed in the visible direction, so that when the check on the change.

② The radius of the arc at the step of the journal or shell hole shall be less than the radius of the arc corresponding to the bearing.

③ bearing assembly in the shaft and the shell hole, there should be no skew phenomenon.

④ in the coaxial two bearings, there must be a shaft with the thermal expansion of the shaft when the movement.

⑤ assembly of rolling bearings, must be strictly prevent dirt into the bearing.

⑥ after the assembly of the bearings, to be flexible operation, noise, working temperature generally should not exceed 65 ℃.

(2) assembly method

When assembling a bearing, the most basic requirement is to apply the applied axial force directly to the end face of the ferrule bearing (mounted on the shaft so that the applied axial force acts directly on the inner ring On the hole when the force applied to the direct role in the outer ring). Try not to affect the rolling body. Assembly methods are hammering method, press assembly method, hot charging method, frozen assembly method.

① hammer method

With a hammer pad on the copper rods and some relatively soft material and then hammer the method, we should pay attention not to make copper and other foreign body into the bearing raceway, do not directly with a hammer or punch directly hit the bearing inner and outer ring, so as not to affect the bearing With the accuracy or cause bearing damage.

② screw press or hydraulic machine assembly method

For bearings with large tolerance tolerances, they can be assembled with a screw press or a hydraulic press. In the pressure before the axis and bearing flat, and coated with a little oil, press the speed should not be too fast, the bearing in place to quickly remove the pressure to prevent damage to the bearing or shaft.

③ hot method

Hot-charging method is to put the bearing in the oil heated to 80 ℃ -100 ℃, so that the bearing hole after the expansion of the sleeve to the shaft, to prevent shaft and bearing from damage. For the dust cover and seal, the inside has been filled with grease bearing does not apply hot charging method.

(3) tapered roller bearing clearance is adjusted after assembly, the main method of useful gasket adjustment, with screw adjustment, with nut adjustment.

(4) When assembling the thrust ball bearing, the tight ring and the loose ring should be distinguished first, and the inner diameter of the tight ring is slightly smaller. The assembled tight ring and the shaft are relatively static at work. Of the step or hole end, otherwise the bearing will lose the role of rolling and accelerated wear.