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Basic knowledge and installation and maintenance of bearings

Pub Time : 2018-09-18 17:15:02

1. Preface

Bearings should be installed in a dry, clean environment, in order to prepare all the necessary parts, tools and equipment before installation, should carefully check the shaft and inner ring of the quality of the coordination and inspection

Check for Burr-free, to ensure cleanliness and smoothness of the mounting surface.

2. Types of commonly used rolling bearings

Common and commonly used rolling bearings mainly include the following:

1, deep groove ball bearings, the use of features:

(1) high speed

(2) High precision

(3) noise, vibration small;

(4)The main bearing radial load

(5) can also withstand a certain axial load

(6) Simple manufacturing, low cost

2, angular contact ball bearings, the use of features:

(1) high speed

(2) fine

(3) Low noise, vibration

(4) can withstand radial and axial load

(5) can be used in pairs

3, cylindrical ball bearings, the use of features:

(1) The same speed ratio of the same size.The ball bearing is low

(2) The precision is high

(3) the noise, the vibration is small

(4) mainly bears the radial load

(5) The inner and outer ring with the flange can withstand the small axial load;

4, spherical roller bearing, the use of features:

(1) Low speed, vibration resistance, impact resistance

(2) has the automatic adjustment of the heart function, that is, the inner ring axis with respect to the outer ring axis has a large tilt (a

(3) The main bearing radial load

(4) can also withstand a certain axial load.

5, needle roller bearings, the use of characteristics:

(1) high speed

(2) can withstand a higher radial load (more than the radial size of other bearings bearing a large radial load)

(3) can not withstand axial load

(4) greater rigidity.

6, adjust the heart Ball bearing, the use of characteristics:

(1) high speed

(2) has automatic adjustment of the Heart function

(3) rigidity is poor, vibration resistance, impact difference.

7, thrust ball bearings, the use of features:

(1) turn
(2) can withstand only one-sided axial load

(3) The shaft ring and the seat ring can not tilt.

8, double row thrust ball bearing, the use characteristic:

(1) The rotational speed is low

(2) can withstand the double-sided shaft

(3) The shaft ring and the seat ring cannot be tilted.

9, double-row radial thrust ball bearings, the use of features:

(1) High speed, high precision

(2) has a certain rigidity, non-impact;

(3) to withstand both sides of the axial load

(4) The shaft ring and the seat ring can not tilt.

10, double row angular contact ball bearings, the use of features:

(1) High speed, high precision

(2) have a certain rigidity, not resistance to impact

(3) Quite two sets of angular contact bearings are mounted back-facing.

11, double row cylindrical roller bearings, the use of features:

(1) High speed, high precision

(2) large rigidity, impact resistance,Vibration

(3) cannot withstand axial loads

12, tapered roller bearings, the use of characteristics:

(1) High speed, high precision

(2) large rigidity, impact resistance, vibration

(3) can withstand Larger axial loads.

13, thrust cylindrical roller bearings, the use of features:

(1) Low rotational speed

(2) high rigidity, impact resistance

(3) can only withstand single-sided axial load;

(4) Shaft

The Circle and seat ring cannot be tilted.

14, thrust spherical roller bearings, the use of features:

(1) Low rotational speed

(2) high rigidity, impact resistance

(3) can only withstand single-sided axial load;

(4)The shaft ring and seat ring cannot be tilted.

3. Bearing Code

3.1 Bearing Code composition


Mainly consists of three parts: the basic code, the pre-set code, the post-code composition. 1. Basic code: Indicates the basic type, structure and size of bearing, is the basis of bearing code.

The basic code is composed of the type code, the size code and the ID number of three parts.

3.2 Type code: in Arabic numerals or uppercase Latin letters:

3.3 Non-standard bearing and inch bearing code:


Non-standard bearing code: Bearing structure is special, the dimensions do not conform to the standard requirements of the bearings called non-standard bearings, its code-numbering method is described in jb/t2974-93 "rolling bearings

Supplementary provisions of the code-name method.

Inch bearing code: According to the size of the bearings manufactured in English, the code-numbering method is not specified. Generally by the user and the manufacturer to agree, can use other methods to compile

Designation of the bearing system.

4. Mounting of bearings

4.1 Bearing installation basically has the following common methods

(1) Press-in method. Small bearings with an interference fit can be pressed on the shaft or in the housing by mechanical or hydraulic means.

(2) Heating method. For larger bearings or large interference, the principle of expansion and contraction can be used to install. Generally use oil bath heating or electric induction heating method.

(3) Installation of tapered bore bearings. Bearings with a tapered bore are always fitted with a perfect fit. For cylindrical bore bearings, the size of the radial clearance after installation is determined by the selected

The greater the amount of interference between the housing bore and the shaft, the smaller the radial clearance after installation. For the installation of tapered bore bearings, the interference is not the same as in the cylindrical bore bearing

Hole, the tolerance of the selected shaft depends on the length of the distance pushed by the bearing on the tapered shaft neck or on the tapered adapter sleeve. The initial radial clearance of the bearing is pushed into the

And the size of the push-in amount determines the degree of fit, so the initial radial clearance of the bearing must be measured first before installation. Constant measurement of radial clearance during bearing push-in

Until the required radial clearance reduction and the desired interference fit are achieved.

4.2 Bearing post-installation lubrication

Mainly in the case of ensuring the normal operation of the bearing, the surface raceway and roll-to-body direct contact, reduce the friction and wear inside the bearing, improve bearing performance, extend the use of bearings

Life, the commonly used lubrication methods are grease lubrication, oil lubrication and solid lubrication three kinds. In general, grease lubrication is the most widely used, and its bearing housing, sealing structure and lubrication facilities are simple

, maintenance is easy, there is certain to prevent water, gas, dust and other harmful impurities into the bearing inside the ability. Oil lubrication is mainly used in heavy-duty, high-speed, high-temperature and other occasions, these

The lubricant flow of the occasion is good, the lubricating effect is better than grease lubrication, the common oil lubrication has oil bath lubrication, drip oil lubrication, splash to oil lubrication, circulating oil lubrication, jet lubrication, oil mist

Lubricating oil and gas lubrication, etc. solid lubrication is used only in certain situations where oil lubrication and grease lubrication are limited, such as high temperature and vacuum conditions.

5. How to disassemble the bearing

When the equipment is repaired, it is sometimes necessary to remove the bearing temporarily, and when the bearing is damaged, it is necessary to remove the bearing and replace the new piece. If the bearing is removed and will continue to be used, the

The rolling element is never allowed to transfer the external force, otherwise the rolling body and the raceway will be crushed.

5.1 Pairs of non-separable bearings

The bearings are removed from the loose mating surface first, then the bearings are pressed out of the tight mating surface using a press, and the bearings can be removed using a special tool double lever and three lever remover.

5.2-Pair split bearings

such as single row cylindrical roller bearings, the outer ring and cage, rolling body as a whole, and the inner ring can be separated. The inner ring and shaft are generally tightly coupled, and if the inner ring is removed from the shaft, it requires a large

External force, and the possibility of damage to the inner circle hole and the surface accuracy of the shaft, it is advisable to use the bearing induction heater heating inner ring, in the thermal expansion of the inner ring is easy to disassemble. Split

Unloading large tapered bore bearings, often using the method of oil pressure, in the taper shaft of the oil hole pressurized oil delivery, so that the inner ring expansion to remove the tapered bore bearings.

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