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Assembly of oil pump motor sliding bearing

by:JNSN     2022-03-13
Bearings are the components used to support and also the parts used to support the rotation of the bearing shaft. The types of bearings are divided according to friction properties: sliding bearings and rolling bearings; according to the direction of load: radial bearings, push bearings, radial thrust bearings Wait.

In this article, the editor of the oil pump motor focuses on the assembly of the sliding bearing. The sliding bearing is a kind of sliding friction bearing. Different forms can be divided into integral type, split type and tile type.

1. Assembly of integral sliding bearing

① Integral sliding bearing, commonly known as bushing, is also the simplest form of sliding bearing. It is mainly assembled by pressing and hammering. Hot-loading method is used.

②Most of the shaft sleeves are made of copper or cast iron, and should be carefully assembled. They can be assembled by hitting with a wooden hammer or a hammer block, and when the interference size tolerance is large, use a press to press in.

③It must be prevented from tilting whether it is knocked in or pressed in. After assembly, the oil groove and oil hole should be in the required position.

④The inner hole should be trimmed for the deformed bearing after assembly. The smaller size can be cut with a reamer, and the larger size can be scraped.

⑤At 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 when it is working, the contact surface between the shaft sleeve and the box body is equipped with positioning pins or seam screws.

⑥Due 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. Solution: a. Before drilling, use a sample to punch against the hard material; drill bit to increase the rigidity of the drill bit when drilling.

Assembly of split bearing

Split bearing, also known as split bearing, has the characteristics of simple structure, convenient adjustment and disassembly. to adjust for a reasonable gap.

①Assembly of bearing pad and bearing body

The contact between the upper and lower bearing pads and the inner hole of the bearing body must be good. The steps at both ends of the bearing shell are 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 no need to scrape.

②The 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.

③Scraping of the bearing bush

The split bearing bush generally uses the matching shaft grinding point. Generally, the bearing bush is scraped off first, and then the bearing bush is scraped on. In order to improve the efficiency, it is not necessary to scrape the bearing bush. Install the bearing bush and cover. When the contact point of the lower bearing bush basically meets the requirements, press the upper bearing bush and the upper cover tightly, and further correct the contact point of the lower bearing bush when scraping and grinding the upper bearing bush. 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 tightened, the shaft can be easily rotated without obvious clearance, and the contact point can be scraped as required.

④Measurement of bearing clearance

The size of the bearing clearance can be adjusted by the shim at the middle parting plane, or it can be obtained by directly repairing and 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. When the diameter is larger, take the smaller clearance value. If the shaft diameter is 60mm, the bearing clearance should be between 0.09-0.15mm.

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