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How should Self-lubricating Bearings be assembled
Author:admin Date:2022-04-22
1. Assembly of sliding bearings
Sliding bearing is a kind of sliding friction bearing, which is characterized by stable operation, reliability and low noise, and can withstand heavy loads and large impact loads.
(1) Assembly of Self-lubricating Bearings
Integral sliding bearings, commonly known as bushings, are also the simplest form of sliding bearings. They are mainly assembled by pressing and hammering. Hot-loading is used for special fields. Most bushings are made of copper or cast iron. , The assembly should be careful, and it can be assembled by hitting with a wooden hammer or a hammer block. When the interference size tolerance is large, press it with a press. Whether it is knocked in or pressed in, it must be prevented from tilting. After assembly, the oil groove and oil hole should be in the required position.
Bearings deformed after assembly should be trimmed for inner holes. Smaller ones can be cut with a reamer, while larger ones can be scraped. At the same time, pay attention to control the matching clearance with the shaft within the tolerance range. In order to prevent the shaft sleeve from rotating during operation, the contact surface between the shaft sleeve and the box body is equipped with positioning pins or seam screws. Due to the different hardness of the box body and the shaft sleeve, when drilling, it is easy to make the drill bit deviate from the soft material. The rigidity of the drill bit when the hole is made.
(2) Assembly of split bearings
Split bearing, also known as split bearing, has the characteristics of simple structure, convenient adjustment and disassembly.
①Measurement of bearing clearance
The size of the bearing clearance can be adjusted by the shim at the mid-section surface, or it can be obtained by directly scraping the bearing bush. The bearing clearance is usually measured by pressing the lead method. Take a few pieces of lead wire with a diameter larger than the bearing clearance and place them on the journal and the mid-section surface, then tighten the nut to press the mid-section surface tightly, then unscrew the nut and remove the bearing cover. Carefully Take out the flattened lead wire, and measure the thickness with a micrometer for each section taken. The bearing clearance can be known according to the average thickness of the lead wire. Generally, the clearance of the bearing should be 1.5‰-2.5‰(mm) of the shaft diameter, and the smaller clearance value is taken when the diameter is larger. If the shaft diameter is 60mm, the bearing clearance should be between 0.09-0.15mm.
②The scraping of the bearing bush
The split bearing pads generally use the matching shaft grinding points. Generally, the bearing pads are scraped off first, and then the bearing pads are scraped. In order to improve the efficiency, the bearing pads and covers can not be installed when scraping off the bearing pads. The contact point of the current bearing pad is basically When the requirements are met, the upper bearing bush and the upper cover are pressed tightly, and the contact point of the lower bearing bush is further corrected when the upper bearing bush is scraped and ground. When scraping, the tightness of the shaft can be adjusted with the increase of scraping times by changing the thickness of the gasket. When the bearing cover is fastened, the shaft can be easily rotated without obvious clearance, and the contact point can be scraped as required.
③The bearing bush is installed in the bearing body, and no displacement is allowed in the radial or axial direction. Usually, the steps at both ends of the bearing bush are used to stop the positioning or locate the positioning pin.
④Assembly of bearing bush and bearing body
The contact between the upper and lower bearing pads and the bore of the bearing body must be good. If it does not meet the requirements, use the bearing body hole of the thick-walled bearing pad as the benchmark, scrape the back of the bearing pad, and make the steps at both ends of the bearing pad close to both ends of the bearing body. Thin-walled bushes only need to make the mid-section of the bearing bush about 0.1mm higher than the mid-section of the bearing body, and it is not necessary to repair and scrape.
Sliding bearing is a kind of sliding friction bearing, which is characterized by stable operation, reliability and low noise, and can withstand heavy loads and large impact loads.
(1) Assembly of Self-lubricating Bearings
Integral sliding bearings, commonly known as bushings, are also the simplest form of sliding bearings. They are mainly assembled by pressing and hammering. Hot-loading is used for special fields. Most bushings are made of copper or cast iron. , The assembly should be careful, and it can be assembled by hitting with a wooden hammer or a hammer block. When the interference size tolerance is large, press it with a press. Whether it is knocked in or pressed in, it must be prevented from tilting. After assembly, the oil groove and oil hole should be in the required position.
Bearings deformed after assembly should be trimmed for inner holes. Smaller ones can be cut with a reamer, while larger ones can be scraped. At the same time, pay attention to control the matching clearance with the shaft within the tolerance range. In order to prevent the shaft sleeve from rotating during operation, the contact surface between the shaft sleeve and the box body is equipped with positioning pins or seam screws. Due to the different hardness of the box body and the shaft sleeve, when drilling, it is easy to make the drill bit deviate from the soft material. The rigidity of the drill bit when the hole is made.
(2) Assembly of split bearings
Split bearing, also known as split bearing, has the characteristics of simple structure, convenient adjustment and disassembly.
①Measurement of bearing clearance
The size of the bearing clearance can be adjusted by the shim at the mid-section surface, or it can be obtained by directly scraping the bearing bush. The bearing clearance is usually measured by pressing the lead method. Take a few pieces of lead wire with a diameter larger than the bearing clearance and place them on the journal and the mid-section surface, then tighten the nut to press the mid-section surface tightly, then unscrew the nut and remove the bearing cover. Carefully Take out the flattened lead wire, and measure the thickness with a micrometer for each section taken. The bearing clearance can be known according to the average thickness of the lead wire. Generally, the clearance of the bearing should be 1.5‰-2.5‰(mm) of the shaft diameter, and the smaller clearance value is taken when the diameter is larger. If the shaft diameter is 60mm, the bearing clearance should be between 0.09-0.15mm.
②The scraping of the bearing bush
The split bearing pads generally use the matching shaft grinding points. Generally, the bearing pads are scraped off first, and then the bearing pads are scraped. In order to improve the efficiency, the bearing pads and covers can not be installed when scraping off the bearing pads. The contact point of the current bearing pad is basically When the requirements are met, the upper bearing bush and the upper cover are pressed tightly, and the contact point of the lower bearing bush is further corrected when the upper bearing bush is scraped and ground. When scraping, the tightness of the shaft can be adjusted with the increase of scraping times by changing the thickness of the gasket. When the bearing cover is fastened, the shaft can be easily rotated without obvious clearance, and the contact point can be scraped as required.
③The bearing bush is installed in the bearing body, and no displacement is allowed in the radial or axial direction. Usually, the steps at both ends of the bearing bush are used to stop the positioning or locate the positioning pin.
④Assembly of bearing bush and bearing body
The contact between the upper and lower bearing pads and the bore of the bearing body must be good. If it does not meet the requirements, use the bearing body hole of the thick-walled bearing pad as the benchmark, scrape the back of the bearing pad, and make the steps at both ends of the bearing pad close to both ends of the bearing body. Thin-walled bushes only need to make the mid-section of the bearing bush about 0.1mm higher than the mid-section of the bearing body, and it is not necessary to repair and scrape.
