Time：2019.12.26 Source：Roller Bearings Suppliers
What is eccentric bearings?
Eccentric bearing is a beneficial type of bearings. Mainly including outer ring, inner ring, roller basket, roller body, eccentric bearings structure is simple, easy to use, do not need eccentric shaft can achieve the eccentric function, make the eccentric mechanism greatly simplified, at the same time make the eccentric mechanism machining save labor, save time, easy to assemble, reduce the manufacturing cost of eccentric mechanism.
Characteristics of eccentric bearings: the inner hole of the inner ring is strange, and there is a longitudinal keyway on the inner wall of the odd hole.
Classification of eccentric bearings
One is a double-layer double-row tapered roller eccentric bearings; Cylindrical roller one is a single-layer raceway small clearance or negative clearance cylindrical roller bearing, mainly installed on both sides of the plate cylinder and the imprint lithography cylinder; The other is a double-layer raceway belt internal and external eccentric negative clearance cylindrical roller bearing unit mounted on both sides of the printing machine roller. Because of its unique structure, the hollow cylindrical roller bearing has strong vibration absorption ability, long precision life, and overload protection compared with the conventional rolling bearing.
Application of eccentric bearings: reducer, petrochemical, textile, metallurgy, mining, steel mill, etc.
Installation of the eccentric bearings
The accuracy, life, and performance of the overall eccentricity bearing will be affected by the installation of the overall eccentricity bearing.Therefore, please fully study the installation of the integral eccentric bearings, that is, please install the integral eccentric bearings according to the operating standards, including the following items.
(1) Clean the overall eccentric bearings and related parts, and grease lubricated overall eccentric bearings and double side with oil seal or dust cover, no need to clean the seal ring before installing the overall eccentric bearings;
(2) Check the dimensions and finishing of relevant parts;
(3) Installation method, the installation of the overall eccentric bearings shall be based on the overall eccentric bearings structure, size, and the matching nature of the overall eccentric bearings components. The pressure shall be directly added to the end face of the tight-fitting ring, and the pressure shall not be transmitted through the rolling body. Generally, the installation of the overall eccentric bearings shall be as follows:
①Force fit overall eccentric bearings inner ring and shaft tight fit outer ring, and the overall eccentric bearings hole is a loose fit, available press the eccentric bearings to be pressed on the shaft of the whole, then the shaft together with the whole eccentric bearings into overall eccentric bearings hole, when pressed on the whole eccentric bearings inner ring end face, the assembling casing made of a soft metal materials.The inner diameter of the assembly sleeve should be slightly larger than the journal diameter, and the outer diameter should be slightly smaller than the retaining edge of the inner ring of the overall eccentric bearings, so as not to press on the retaining frame.When the outer ring of the eccentric bearings is closely matched with the seat hole, and the inner ring is loosely matched with the shaft, the overall eccentric bearings can be first pressed into the hole of the overall eccentric bearings seat. At this point, the outer diameter of the assembly sleeve should be slightly less than the diameter of the seat hole.If the overall eccentric bearings ring is in a tight fit with the shaft and seat hole, the mounting inner ring and the outer ring should be pressed into the shaft and seat hole at the same time. The assembly casing should be able to tighten the end faces of the inner ring and outer ring of the overall eccentric bearings at the same time.
② Heating fit by heating the overall eccentric bearings or the overall eccentric bearings seat, the use of thermal expansion will be a tight fit into the loose fit installation method.This method is suitable for interference quantity larger overall installation of eccentric bearings, the whole eccentric bearings or separable before hot charging type uniform heating in the eccentric bearings ring into the fuel tank of the whole 80-100 ℃, and then loaded on the shaft, as soon as possible out of the oil to prevent inner ring after cooling end face and the shoulder joint is not tight, the eccentric bearings axial fastening again after cooling.When the outer ring of the integral eccentric bearings and the integral eccentric bearings seat of light metal are closely matched, the heating method of the integral eccentric bearings seat is adopted to avoid abrasion of the mating surface.Tank heating whole eccentric bearings, due at a certain distance from the bottom of a mesh, or hanging hooks in the whole eccentric bearings, the eccentric bearings cannot be on the bottom, to prevent impurities into the whole eccentric bearings or uneven heating, fuel tank must have a thermometer, strictly control the oil temperature shall not exceed 100 ℃, to prevent the tempering effect, reduce the hardness of ring;
③Cone hole overall eccentric bearings installed eccentric taper hole overall bearing can be directly installed in a taper shaft neck, or load set of the cone and the withdrawal of the tightness of co-operating whole eccentric bearings radial clearance reduction is available to measure, therefore, before installation should measure the overall eccentric bearings radial clearance, the installation process should often measure the clearance to meet the need of clearance reduction is, commonly used while installing lock nut installation, also can adopt the method of heating installation;
④The installation of the overall thrust eccentric bearings whole week with shaft with general transition fit, seat and the overall eccentric bearings holes with the general for the clearance fit, so the whole eccentric bearings is easy to install, two-way thrust whole eccentric bearings axial spring should be fixed on the shaft, in order to prevent the relative to the axis of rotation.The mounting method of the overall eccentric bearings is generally the case of shaft rotation, so the inner ring and the shaft are over winning, and the outer ring of the overall eccentric bearings and the overall eccentric bearings room are clearance.
Matters needing attention
Rolling integral eccentric bearings is a precision part, so in the use of the requirements of the corresponding prudent attitude, even if the use of high-performance integral eccentric bearings, if the use of improper, can not achieve the expected performance effect, so, the use of integral eccentric bearings should pay attention to the following:
(1) Keep the overall eccentric bearings and its surrounding environment clean. Even if the naked eye can not see the smile of dust into the eccentric global bearing, it will increase the overall strange bearing wear, vibration, and noise.
(2) When using the installation to be careful, do not allow sharp stamping, do not let the hammer directly hit the overall eccentric bearings, do not allow the transfer of pressure through the rolling body.
(3) Use appropriate and accurate installation tools, use special tools as far as possible; try to avoid the use of cloth and short fiber such as things.
(4) To prevent the corrosion of the overall eccentric bearings, directly with the hands of the eccentric global bearing, to thoroughly wash the hands of sweat, and coated with high-quality mineral oil before the operation, especially in the rainy season and summer to pay attention to rust.