What is an eccentric bearing,composition and installation of eccentric lock bearing?

Overall eccentric lock bearing, also called eccentric lock bearing, is a very useful bearing type. It mainly includes outer ring, inner ring, rolling body flower basket, rolling body, and eccentric lock bearing. The structure is simple and easy to use. The eccentric function can be realized without the eccentric shaft, which greatly simplifies the eccentric mechanism and saves machining of the eccentric mechanism. Time saving, easy assembly and reduced manufacturing cost of the eccentric mechanism.

Eccentric lock bearing features: The inner hole of the inner ring is an eccentric hole, and the keyway is vertical on the inner groove of the eccentric hole.

Classification of eccentric lock bearing: one is double-layer double-row tapered roller eccentric lock bearing; cylindrical roller is a single-layer raceway small clearance or negative clearance cylindrical roller bearing, which is mainly installed in the printing plate cylinder Both sides of the printing cylinder; the other is a double-layered track roller bearing unit with eccentric negative clearance inside and outside, which is installed on both sides of the rubber cylinder of the printing press. Because of its special structure, hollow cylindrical roller bearings have stronger vibration absorption ability, longer precision life and overload protection compared with conventional rolling bearings.

Application of eccentric lock bearing: reducer, petrochemical, textile, metallurgy, mining, steel plant, light and heavy machinery, etc.

The composition of eccentric lock bearing: Eccentric bearing is a very important bearing in the cycloid pin gear reducer. The original eccentric lock bearing consists of three parts: an eccentric sleeve and two 502 series cylindrical rollers. The eccentric sleeve and the inner ring of the bearing are integrated into one to form an eccentric lock bearing. The eccentric lock bearing mainly includes an outer ring, an inner ring, a rolling element flower basket, and a rolling element, which are characterized in that the inner hole of the inner ring is an eccentric hole and a longitudinal key groove is provided on the inner side wall of the eccentric hole. The eccentric lock bearing has a simple structure and is convenient to use. The eccentric function can be realized without an eccentric shaft, which greatly simplifies the eccentric mechanism. At the same time, the machining of the eccentric mechanism is labor-saving, time-saving, and easy to assemble.

Installation

Overall eccentric bearing installation The quality of the overall eccentric bearing installation will affect the accuracy, life and performance of the overall eccentric bearing. Therefore, please fully study the installation of the overall eccentric bearing, that is, install the overall eccentric bearing according to the operating standards including the following items.

1. Clean the overall eccentric bearing and related parts. (For greased and lubricated overall eccentric bearings and oil seals or dust covers on both sides, the overall eccentric bearings of the seal ring need not be cleaned before installation.)

2.Check the size and finishing of related parts

3. Installation method The installation of the overall eccentric bearing should be based on the overall eccentric bearing structure, size and the mating properties of the overall eccentric bearing component. The pressure should be directly applied to the end face of the tightly matched ferrule, and the pressure should not be transmitted through the rolling body. The installation of eccentric bearings generally adopts the following methods:

(1) Press fit The inner ring of the overall eccentric bearing is tightly fitted with the shaft. When the outer ring and the overall eccentric bearing seat hole are loosely fitted, the whole eccentric bearing can be press-fitted on the shaft with a press, and then the shaft and the whole The eccentric bearing is installed together in the hole of the overall eccentric bearing seat. When press-fitting, the end face of the inner ring of the overall eccentric bearing is cushioned with a soft metal material assembly sleeve (copper or soft steel). The inner diameter of the mounting sleeve should be slightly larger than the diameter of the journal, and the outer diameter should be slightly smaller than the flange of the inner ring of the overall eccentric bearing to avoid pressing on the cage. The outer ring of the overall eccentric bearing fits tightly with the hole of the overall eccentric bearing seat. When the inner ring and the shaft are loosely fitted, the overall eccentric bearing can be pressed into the hole of the overall eccentric bearing seat first. At this time, the outer diameter of the mounting sleeve should be slightly smaller than the seat. The diameter of the hole. If the overalleccentric lock bearing ring is tightly fitted with the shaft and the seat hole, the inner and outer rings of the installation must be pressed into the shaft and the seat hole at the same time. The structure of the assembly sleeve should be able to tighten the inner and outer ring of the overall eccentric lock bearing at the same time. Of the end face.

(2) Heating fit By heating the overall eccentric lock bearing or the overall eccentric lock bearing seat, the thermal expansion is used to convert the tight fit into a loose fit installation method. It is a common and labor-saving installation method. This method is suitable for the installation of integral eccentric bearings with a large interference amount. Prior to hot mounting, the rings of the integral eccentric lock bearing or the separable integral eccentric lock bearing are put into the oil tank and heated evenly at 80-100 ° C, and then removed from the oil as soon as possible. Installed on the shaft, in order to prevent the inner ring end face and the shaft shoulder from fitting tightly after cooling, the overall eccentric bearing can be axially tightened after cooling. When the outer ring of the integral eccentric lock bearing is tightly fitted with the integral eccentric bearing housing made of light metal, a hot-fitting method of heating the integral eccentric lock bearing housing can be used to prevent the mating surface from being scratched. When heating the overall eccentric lock bearing with an oil tank, there should be a grid at a certain distance from the bottom of the box, or the overall eccentric lock bearing is suspended by a hook. The overall eccentric lock bearing cannot be placed on the bottom of the box to prevent impurities from entering the overall eccentric lock bearing or uneven heating. There must be a thermometer in the fuel tank, and the oil temperature must be strictly controlled not to exceed 100 ℃ to prevent the tempering effect and reduce the hardness of the ferrule.

(3) Installation of the overall eccentric lock bearing with a tapered bore The overall eccentric lock bearing with a tapered bore can be directly mounted on a tapered journal, or on the tapered surface of an adapter sleeve and a withdrawal sleeve. The degree of fit can be used with the overall eccentric lock bearing diameter. Measure the amount of clearance reduction. Therefore, the radial clearance of the overall eccentric bearing should be measured before installation. The clearance should be measured frequently during installation to achieve the required clearance reduction. Generally, a lock nut is used during installation. Installation can also be carried out by heating.

(4) Installation of thrust overall eccentric lock bearing The fit between the periphery of the thrust overall eccentric lock bearing and the shaft is generally a transition fit, and the fit between the seat ring and the overall eccentric lock bearing seat hole is generally a clearance fit. Therefore, this type of overall eccentric bearing is easier to install and has two directions The central shaft spring of the thrust integral eccentric lock bearing should be fixed on the shaft to prevent rotation relative to the shaft. The installation method of the overall eccentric bearing is generally the case where the shaft rotates. Therefore, the cooperation between the inner ring and the shaft is an excessive fit, and the cooperation between the outer ring of the overall eccentric lock bearing and the overall eccentric lock bearing chamber is a clearance fit.

4. Inspection after installation of overall eccentric lock bearing

5.Addition of lubricant

Inspection of overall eccentric lock bearing operation After the installation of the overall eccentric lock bearing is completed, an operation inspection should be performed immediately to determine whether the installation is normal.

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