What is bearing clearance ???What is the effect of the large original clearance of the bearing?

Bearing clearance, let's put it simply!It is the allowable amount of movement that can be allowed under the condition of ensuring the normal operation of the bearing in the installation of the bearingHuh!!

You can take a look at it in detail!!The details are all there!!However, one thing to be sure is:

When selecting bearings, we must pay attention to the determination and selection of bearing clearance. Different environments will have different requirements!This must be clear, in detail, it is best to consult some imported bearing ** businessmen, they will be more accurate to tell you how to choose!

I know that there is an imported bearing wholesaler, called Aosheng Machinery Bearing, they are the total number of imported bearings from Japan MSRHK, you can find them to understand!!They also have an official website!!You can take a look at !!

Optimal effective bearing clearance for SKF bearings.

The rated load of a rolling bearing is also a function of the bearing clearance, and the rated load value given in the INA Bearing product catalogue is the value when the effective clearance is zero.

Theory and test show that the best effective clearance value is a small negative clearance value, at this time the bearing can have the maximum service life, greater or less than this optimal value, the FAG bearing life will be reduced.

However, the magnitude of the life reduction is different in two directions: it decreases sharply along the negative clearance direction, which leads to the temperature rise and expands the inner ring and the rolling element, further increases the negative value of the clearance, and is prone to a sharp reduction in life, and the reduction of the life of the NSK bearing along the direction of increasing the clearance is relatively much more gentle, so the general clearance value is the lower limit with zero clearance, and the upper limit is selected along the positive clearance direction.

Only in precision or important parts, where the load and temperature rise are small and stable, the maximum service life can be obtained by accurately calculating and ensuring that the clearance is adjusted to the best effective clearance value (very small negative clearance).

The imported bearing adopts the method of constant pressure and preloading, which is relatively easy to achieve the best effective negative clearance.

Hazards of unsuitable raw clearance of bearings:

The operating clearance of the bearing is too large.

1. The working clearance of the bearing is too large, which is mainly caused by the excessive selection of the natural clearance of the bearing and the insufficient compression force of the bearing. In the high-speed operation of the combined reducer, when the natural clearance of the bearing is large, it determines that its working clearance is also relatively large, which will cause the reducer to vibrate greatly during operation and reduce the service life of the bearing.

2. When the natural clearance of the bearing is reasonable, if the compression torque of the bearing seat is less than the frictional torque of the bearing, the phenomenon of rotation of the outer ring of the bearing will occur, which will wear the lining pad in the bearing seat, reduce the meshing accuracy of the gear, and produce vibration.

3. When the lining pad is worn to a certain extent, it will cause the increase or decrease of the gear center distance, the increase or decrease of the gear backlash and the inaccurate positioning of the gear, which will lead to the breaking of the gear teeth and reduce the service life of the bearing.

The original lead gap of the bearing is too small.

If the working clearance of the bearing is too small, the frictional torque of the bearing will be increased, resulting in a large amount of heat, which will easily lead to heating damage to the bearing. This is because, when the working clearance of the bearing is too small, it will lead to poor lubrication of the rolling elements of the bearing and the inner and outer rings of the bearing, and a large amount of heat will be generated due to dry friction, resulting in wear, cementation, expansion and cracking of the inner and outer rings of the bearing, until the bearing is damaged.

Types of clearances:

Original clearance: the clearance before the bearing is installed;

Mounting clearance: The clearance after the bearing is mounted. Due to the interference fit, the installation clearance is smaller than the original play;

Working clearance: The clearance of the bearing under actual operating conditions.

The method of checking the radial clearance is as follows:

Sensory method. 1. There is a hand rotating bearing, and the bearing should be stable and flexible without jamming.

2. Shake the outer ring of the bearing by hand, even if the radial clearance is only, the axial movement of the top point of the bearing. This method is designed to be closed to a single row of radial ball bearings.

Measurement method. 1. Check with feeler gauge to confirm the maximum load part of the rolling bearing, and stuff the feeler gauge between the rolling element and the outer (inner) ring that is 180 ° to it, and the thickness of the feeler gauge with appropriate tightness is the radial clearance of the bearing. This method is widely used in spherical bearings and cylindrical roller bearings.

2. Check with the dial gauge, first zero the dial gauge, and then jack up the outer ring of the rolling bearing, and the reading of the dial gauge is the radial clearance of the bearing.

The method of checking the axial clearance is as follows:

1. Sensory method.

Check the axial clearance of rolling bearings with your fingers, and this method should be used where the shaft end is exposed. When the shaft end is closed or cannot be inspected with a finger for other reasons, the shaft can be checked for flexible rotation.

2. Measurement method.

1) Check with feeler gauge, Hongqi operation method is the same as the method of checking radial clearance with plug for key cracking, but the axial clearance should be.

c=λ/2sinβ）

where c - axial clearance, mm;

Feeler gauge thickness, mm;

Bearing taper angle, (°

2) Check with the dial gauge, when the shaft is moved by a prowbar to make the shaft in two extreme positions, the difference between the dial gauge readings is the axial clearance of the bearing. However, the force applied to the crowbar should not be too large, otherwise the shell will be elastically deformed, even if the deformation is small, it will affect the accuracy of the measured axial clearance.

The clearance adjustment method of rolling bearing copy is commonly used to adjust the gasket bai

method and screw adjustment method.

When the rolling shaft is assembled, the clearance should not be too large, and the DAO should not be too small. The clearance is too large, will cause the number of rolling elements to bear the load at the same time to decrease, make the load of a single rolling element increase, thereby reduce the rotation accuracy of the bearing, reduce the service life, the clearance is too small, the friction will increase, the heat generated will increase, aggravate the wear, and the service life of the bearing can also be reduced. Therefore, many bearings need to be tightly controlled and adjusted during assembly.

The position of the axial fixing parts of the bearing was adjusted, and the clearance was adjusted. For example, adjusting the thickness of the reducer end cover gasket is to adjust the clearance.

Adjusted by fit (interference fit reduces clearance), tapered bore bearings are adjusted by means of adapter sleeves. In addition, the clearance will also change when the operating temperature changes.

There are two types of clearance for rolling bearings, sources.

One is radial clearance, i.e., when a bai

The ferrule is fixed, and the maximum amount of activity of the other DU ferrule on the radial zhi. The other type of DAO is axial clearance, which is the maximum amount of activity of one ferrule in the axial direction when the other ring is fixed. The function of rolling bearing clearance is to ensure the normal operation of the rolling element.

lubricates and compensates for thermal expansion.

According to the different bearing structure and clearance adjustment methods, bearings can be divided into two categories: non-adjusting and adjusting. Radial ball bearings, radial cylindrical roller bearings, radial spherical ball bearings and radial spherical roller bearings belong to non-adjusting bearings. Tapered roller bearings, radial thrust ball bearings and thrust bearings are adjusting bearings, and the axial clearance of such bearings must be adjusted according to the use of the application in the installation and application.

It should be by adjusting the cage.

Bearing clearance refers to:The maximum distance that can be moved radially and axially between the inner and outer rings of a bearing without any load. As shown below:

Schematic diagram of the clearance.

Here's a breakdown:

a.As can be seen from the above figure, the bearing clearance is divided into:Radial clearancewithAxial clearance

Both can affect the accuracy and performance of the entire mechanical assembly, but among themRadial clearanceMost directly impactedBearing life.

b.Because the bearing may produce extrusion deformation during assembly, and will be affected by temperature during operation, the above-mentioned bearing radial clearance can be divided intoOriginal clearance, installation clearance, and working clearance.

PS: In a specific application, the corresponding clearance of the bearing should also be controlled within a certain rangeExcessive clearance will affect the accuracy, resulting in vibration and noise; If it is too small, it may not compensate for the deformation caused during operation or make it difficult to install.

Therefore, bearing clearance is an important parameter of the bearing, which must be taken into account when selecting.

Summary. Hello, 1. Radial clearance: the bearing that is not preloaded and bears radial load, its radial clearance g is:

The arithmetic mean of the radial distance of the outer ring from one radial eccentric limit position to the opposite limit position of the inner ring relative to the inner ring at any radial angle in the radial direction at any angle. 2. Axial clearance: The bearing that can bear the axial load in both directions without preloading is in the non-preloaded state, and its axial internal clearance g is:

The average of the axial distance of one ring from one axial limit position to the opposite limit position relative to the other in the absence of an external load.

Hello, 1, radial clearance: non-preloaded state, bearing radial load, the radial clearance g is: along the radial direction of any angle of the Qiminghu, in the absence of external load, the outer ring relative to the inner ring from a radial eccentric limit position, to the arithmetic mean of the radial distance of the opposite limit position.

2. Axial clearance: The axial internal clearance g of the bearing that can bear the axial load in two directions in the non-preloaded state is: when there is no external load, the average value of the axial distance of one ring relative to the other ring moving from one axial limit position to the opposite limit position.

Bearing clearance is the gap between the rolling element of the bearing and the inner and outer shells of the bearing. The so-called bearing clearance refers to the amount of movement when the bearing is not installed in the shaft or bearing housing, the inner ring or the outer ring is fixed, and then the bearing clearance is not fixed when the pure cavity is moved radially or axially. According to the direction of movement, it can be divided into radial clearance and axial clearance.

The size of the clearance during operation (called the working clearance Hoho) has an impact on the rolling fatigue life, temperature rise, noise, vibration and other properties of the bearing.

The role and requirements of bearing clearance: The existence of clearance in the bearing is to ensure that the bearing can operate flexibly and without hindrance, but at the same time, it is also required to ensure that the bearing runs smoothly, the axis of the shaft is not significantly settled, and the number of rolling elements that bear the load is as large as possible. Therefore, the clearance of the bearing has a great influence on the dynamic performance (noise, vibration and friction) and rotational accuracy of the bearing, as well as the load-bearing capacity of the bearing (wear and fatigue).

The clearance is equal to the clearance. It's what we often call a gap. It is generally the gap between the middle and the tomb of one object relative to another. It is divided into radial clearance and axial clearance.

For example, you have a set of open deep groove ball bearings, which are composed of an inner ring, an outer ring, a steel ball, and a cage. When you fix the inner ring, the outer ring can rotate very smoothly; Fixing the outer ring, the inner ring can also rotate smoothly, this is because the inner ring of the bearing is not disadvantageous, there is a certain amount of clearance between the outer ring and the rolling element, this clearance can be large, can also be small, but there are relevant value provisions, in the assembly can be fixed.

If you use the feel to test the clearance, then you need to fix the inner ring, so that the outer ring is equivalent to the inner circle to do radial movement to test the clearance, or fix the inner ring or the outer ring, and make a circle relative to the other circle of vertical movement to test the game, Of course, this kind of use of feel to feel the clearance is not accurate, can only be engaged in this kind of industry for a long time to use this method to roughly feel the scope of the clearance.

The above is what I explain to you in the simplest language, I don't know if you understand, if you don't understand, you can continue to ask].

Here's the explanation from the books:

Bearing clearance is also known as bearing clearance. The so-called bearing clearance refers to the amount of movement when the bearing is not installed in the shaft or bearing housing, the inner ring or the outer ring is fixed, and then the bearing clearance is not fixed when the side is moved radially or axially. According to the direction of movement, it can be divided into radial clearance and axial clearance.

The size of the clearance (called working clearance) during operation has an impact on the rolling fatigue life, temperature rise, noise, vibration and other properties of the bearing.