Common problems and solutions When installing deep groove ball bearings

1, Any requirements on the mounting surface and the installation location of deep groove ball bearings?

Yes. If the scrap iron, burrs, dust and other impurities from entering in deep groove ball bearings, the bearing in operation will produce noise and vibration, or even damage deep groove roller and steel balls. Therefore, before the installation of deep groove ball bearings, you must make sure that the installation surface and environment clean.

2, Do deep groove ball bearings need cleaning before installation?

Deep groove ball bearings are coated with antirust oil, you need to carefully clean them with cleaner gasoline or kerosene, and then coated with a clean high quality or high temperature lubricant before installation. Influence of cleanliness on the service life of the bearing and vibration noise was considerable. But what we want to remind you is: sealed bearings do not need cleaning and refueling.

3, How to choose the right grease?

Lubrication on the operation and life of has a very important impact on the deep groove ball bearings. I briefly describe the general principles of selection of deep groove ball bearing grease. Grease is made of base oils, thickeners and additives. Grease functions of different types and same type with different brands vary, be sure to pay attention to duing to corresponding speed limit is different. Grease performance mainly determines by the base oil. Low viscosity base oil is suitable for low temperature, high speed situation, while high viscosity oil is suitable for high temperature, high-load situation. The thickener is also related to the lubrication function. Water resistance of the thickeners determines the water resistance of the grease. In principle, grease with different brands cannot be mixed, and, even if grease with the same kind of thickeners, also has a negative impact on each other due to different additives.

4, The more grease,the better when lubricating the deep groove ball bearings?

When lubricating bearings, the more grease,the better, this is a common misconception. Too much grease in bearings and bearing interior will cause excessive mixing of oils and fats, which results in extremely high temperatures. Number of bearing lubricant filling is covered with 1/2~1/3 bearing internal space,reduced to one-third when high speed.

5, How to install and disassemble the deep groove ball bearings?

Do not hammer directly on the surface and non-bearing surface of deep groove ball bearing when installation. Let bearing be an average force with block, sleeve or other installation tools (Tools) . Never install using the ball driving force. If the mounting surface is coated with lubricating oil, it will make the installation more smooth. If combined with interference is greater, put bearing in mineral oil, heated to 80~90℃ and install as soon as possible. Strictly control oil temperature not exceeding 100 ° c to prevent the effect of tempering hardness reducing the impact and recovery. Removing when you encounter problems, we recommend that you use the removal tool to pull on the inner ring at the same time carefully pouring hot oil, and heat makes the bearing inner ring expanding so that making it more prone to shedding.

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How to Install Deep Groove Ball Bearing?

Deep groove ball bearings are used in a particularly wide variety of applications. Consequently, they are available in many executions and sizes. The standard SKF range comprises the following types:

– single row deep groove ball bearings
– SKF Energy Efficient deep groove ball bearings
– single row deep groove ball bearings with filling slots
– stainless steel single row deep groove ball bearings
– double row deep groove ball bearings
– single row hybrid deep groove ball bearings, see section “Engineering products – Hybrid bearings
– single row deep groove ball bearings for high temperatures, see section “Engineering products – Bearings and bearing units for high temperatures”
– cam rollers, see section “Track runner bearings – Cam rollers”
– polymer ball bearings, see section “Engineering products – Polymer ball bearings

Deep groove ball bearing is installed correctly is very important, following a few steps outline the main points of the installation of deep groove ball bearings:

Preload requirements

  • For the required precision deep groove ball bearing drive, such as deep groove ball bearing spindle, there are often preload requirements. These deep groove ball bearing preload are reasonable, in order to achieve the nominal accuracy. Deep groove ball bearing preload is generally factory-supplied parameters. The traditional rule of thumb is often the assembly workers install. You can use pre-measured amount of preload deformation method in some structure. Obtained after deformation, the structure design in a tightening gasket, the gasket is just pretension height difference before and after the change. In this way, tighten the nut to ensure death, preload volume remains unchanged.

Clearance before installation

  • If there are burrs, dirt and other foreign matter go into the deep groove ball bearing iron filings, deep groove ball bearings will generate noise and vibration when in operation, or even damage the raceway and rolling elements. Therefore, when install deep groove ball bearings, you must ensure that the mounting surface and installation of the environment clean.
  • Deep groove ball bearings should be cleaned before the installation. Coated with anti-rust oil, you must use gasoline or kerosene to clean carefully and then coated with clean, high-quality, high-speed or high-temperature grease before installation. Cleanliness of deep groove ball bearing will impact the service life and vibration noise is very large.

How to choose the grease

  • How to choose the grease lubrication of deep groove ball bearing that influences the operation and life importantly. Here to brief you the general principles to choose grease. Generally low-viscosity base oil for low temperature, high-speed; high viscosity for high temperature, high load. Thickener is also related to lubrication, grease thickener of water determines the water resistance. In principle, the grease cannot mix different brands, and even if the same kind of grease thickener, also because of the different additives adversely affect each other. Deep groove ball bearings and grease will cause too much room over oil mixing, resulting in extremely high temperatures.

Deep groove ball bearing installation

  • How to install and remove the hammer when installed directly face deep groove ball bearing and non-force side, should be briquetting, sleeve, or other deep groove ball bearing installation tool to make uniform force. If the mounting surface coated with oil, the bearing will be installed more smoothly. Deep groove ball bearings should be placed in mineral oil heated to 90 – 100 ℃ immediately after installation. Difficulty in dismantling, it is recommended that you use the removal tool to pull the inner ring, while carefully poured on the hot oil, deep groove ball bearing inner ring heat will expand, making it easier to fall off.

How to choose the appropriate clearance conditions

  • All of the deep groove ball bearings require minimum clearance work; you must choose the appropriate clearance conditions. Rolling deep groove ball bearing radial clearance group is divided into five groups -2, 0 group, 3 groups, 4, 5 groups, followed by small to large clearance value, where 0 is the standard clearance group. Basic radial clearance group for general operating conditions, temperature, and commonly used conventional interference fit; at high temperature, high-speed, low noise, low friction to work under special conditions such as deep groove ball bearing; of precision spindle, machine tool spindles with deep groove ball bearings, etc. should use a smaller radial clearance; for deep groove ball bearing roller can maintain a small amount of clearance work. In addition, separate type of deep groove ball bearings are indifferent clearance; Finally, deep groove ball bearing clearance work after installed, install the front than the original clearance is small, because the deep groove ball bearings to withstand a certain load rotation, there are deep groove ball bearing and load produced with the elastic deformation. Rolling deep groove ball bearing clearance and preload adjustment process is to improve the precision deep groove ball bearing swivel and carrying capacity, reduce vibration and noise transmission effective means. Assembly work should clarify the concept of deep groove ball bearing assembly clear the technical requirements, while also taking into account the deep groove ball bearing temperature control and good lubrication, the right way to use this process to ensure the ball rolling groove the quality of the bearing assembly.

Article Resource :http://www.isutami.com/topic/t12050901/The-Installation-Of-Deep-Groove-Ball-Bearings.html.Check more about deep groove ball bearing topic,see at http://www.ballbearing-china.com/how-to-install-deep-groove-ball-bearing.html

The Angular Contact Ball Bearing

Angular contact ball bearings, also known as spindle ball bearings, consist of an inner ring, outer ring, ball, and a cage to contain and separate the ball. Angular contact ball bearings can support an axial load, but cannot be used by a single bearing because of their angle. They must be used in combinations or in pairs.

An angular contact ball bearing uses axially asymmetric races. An axial load passes in a straight line through the bearing, whereas a radial load takes an oblique path that tends to want to separate the races axially. So the angle of contact on the inner race is the same as that on the outer race. Angular contact bearings better support “combined loads” (loading in both the radial and axial directions) and the contact angle of the bearing should be matched to the relative proportions of each. The larger the contact angle (typically in the range 10 to 45 degrees), the higher the axial load supported, but the lower the radial load. In high speed applications, such as turbines, jet engines, and dentistry equipment, the centrifugal forces generated by the balls changes the contact angle at the inner and outer race. Ceramics such as silicon nitride are now regularly used in such applications due to their low density (40% of steel). These materials significantly reduce centrifugal force and function well in high temperature environments. They also tend to wear in a similar way to bearing steel—rather than cracking or shattering like glass or porcelain.

Most bicycles use angular-contact bearings in the headsets because the forces on these bearings are in both the radial and axial direction.

Angular contact ball bearings have raceways in the inner and outer rings that are displaced with respect to each other in the direction of the bearing axis. This means that they are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads.

The axial load carrying capacity of angular contact ball bearings increases with increasing contact angle. The contact angle α is defined as the angle between the line joining the points of contact of the ball and the raceways in the radial plane, along which the load is transmitted from one raceway to another, and a line perpendicular to the bearing axis (fig).

SKF angular contact ball bearings are produced in a wide variety of designs and sizes. Those commonly used and included in this catalogue are
single row angular contact ball bearings
double row angular contact ball bearings
four-point contact ball bearings

Angular contact ball bearings are classified with different accuracy and tolerance ranges for ball bearings on the ABEC bearing rating scale. A higher ABEC number indicates that the bearing tolerances are tighter. When searching for your angular contact bearing, it is important to consider aspects like operation specifics and dimensions.

Operating Specifics for Angular Contact Ball Bearings

  • Static radial load: the maximum radial load the bearing can withstand without succumbing to the pressure
  • Dynamic radial load (calculated constant radial load): the amount of load a set of similar bearings with fixed outer rings can withstand against a rating life of one million revolutions of the inner ring
  • Rated speed: Grease lubrication gives a lower rated speed for bearings as compared to a bearing with oil lubrication.

Dimensions for Angular Contact Ball Bearings

  • Design units of angular contact bearings can be in either inches or metric units
  • Outside diameters include housing for housed units but exclude the flange for flanged bearings
  • Bore
  • Outer ring width

The most common types of angular ball bearing include four point contact ball bearings, singular row, and double row angular contact ball bearings. Angular contact bearings have different kinds and styles of shielding and seals, which essentially retain lubricant to provide protection against contamination. In this type of bearing, there are different types of seals and shields used, including single seal, double seal, single shield, and double shield. When compared to shields, seals provide better lubricant coverage and containment, but have a reduced maximum speed capability.

There are a variety of materials used in the construction of the angular contact bearing, including stainless steel, ceramic, and plastic. This type of ball bearing can also be plated. The materials that are commonly used to plate these bearings include chrome and cadmium.

Purpose and method of preload of deep groove ball bearings

What Is Bearing Preload?

Bearing preload is related to the issue of clearance and can be critical for the proper functioning of your bearing. There are multiple techniques and ways of looking at the preload process, and we will examine them in depth here. A bearing needs to be fitted with a shaft and housing and will have some level of clearance, meaning there will be some give between the different parts of the ball bearing. To remove this internal clearance and create an interference fit, a preload is necessary. The preload essentially describes the process wherein a permenant thrust load is applied to the bearing, essentially using force to push the bearing so that it is secure in the groove and has no axial clearance.

Do not allow powerful punch, tap TIMKEN bearings directly with a hammer and transmit pressure through the rolling element.

Using special tools as much as possible, avoid using fabric and staple fiber or something.

Even invisible micro dust caming into the TIMKEN bearings, also increase the bearing wear, vibration and noise.

When directly taking deep groove ball bearings with hands, fully wash away the sweat on his hand is necessary, and coated with high quality mineral oil before operation. Paying particular attention to rust during the rainy season and summer.

In some special operating conditions, deep groove ball bearings can be obtained relatively longer than the traditional calculation of life, especially under light load conditions. These special conditions are, rolling surface (track and rolling elements) were effectively separated by lubricant film and no surface damage by limiting pollutants enter. In fact, in an ideal condition, the so-called deep groove ball bearing with permanent life is not impossible.

(1) right decide about radial direction of the axis and axial direction, inhibit the shaft of the beating at the same time.
(2) increasing bearing rigidity. The spindle of the machine uses bearing, SKF deep groove bearing for differential mechanism pinion by bike.
(3) prevent vibration in axial direction and abnormal noise due to resonance. Small motor uses bearing.
(4) inhibit rotate and slide of rolling elements,including revolution slide and rotation slide. High speed rotating radial spherical plain thrust bearings, thrust ball bearings.
(5) for rings, keep in the correct position of rolling elements. use thrust ball bearings, spherical roller thrust bearings on the horizontal axis.

Preload method: locate the preload is to reset the SKF bearing the relative positions of axial direction, also does not change the preload method in use. Here are some examples:
(1) method that in order to implement preload adjusted width difference in advance or combinations of axial clearance of the bearing after fastening.
(2) method that using the adjusted size of liner and wedge, so that the bearing preloads.
(3) method that after tightening the screw and nut which can adjust the axial direction clearance. On this occasion, in order to get the appropriate amount of preload, determine the starting friction torque while adjusting.

Check more bearing preload information at http://www.nmbtc.com/bearings/engineering/preload.html and http://www.gobearings.com/preload_methods.htm.

The structure and uses of linear motion ball bearing

Structure of Linear motion ball bearing is that, it is equipped with retainer within the outer ring where there is more than one ball in. The balls are in infinite loop motion. Spring retaining ring fixed on both ends of the retainer are fixed with internal circlip,and a gap window is set in the straight track of balls force direction. This part is to enable loading steel balls rolling contact with axis, is relatively mobile with a very low coefficient of friction. Therefore linear motion ball bearings is the most suitable bearings for mechanical equipment, automation equipment, and energy-saving equipment. Linear motion bearings are being increasingly widely used in electronic, mechanical, instrumentation, robotics, tools, machinery, food machinery, packaging machinery, printing machinery, textile machinery, medical equipment, CNC machine tools, automobiles, and other general or specific machinery industry.

Advantages of linear motion ball bearing:

1. As mobile contacts can make the starting resistance of friction and dynamic friction resistance is minimal, so you can save energy, easy access to high velocity.

2. Load increases, but no sensitive changes of friction coefficient, so,under heavy load, minimal friction coefficient and long-term constant precision, which makes the service life longger.

3. Interchangeability is good, convenient installation and time saving and innovative mechanical structure, small, and light weight.

4. Oil-saving procedures, simplify lubrication and maintenance.

5. The bearing with additional oil seal on both sides is also applies in places easily penetrated more dust or foreign bodies.

Pressure ball bearings

Pressure ball bearing divides into one-way (Uni-directional pressure ball bearing)and two-way(Bi-directional pressure ball bearing) two types.

Uni-directional pressure ball bearing is a bearing with steel balls fitted in rolling ring, 90 ° contact angle, can withstand the unidirectional axial load only, and not suitable for high speed rotation. The bearings can be separated into three pieces, and there are arc-shaped deep groove for balls rolling on two gaskets.

Bi-directional pressure ball bearing is a bearing with the intermediate ring and two outer rings installed on the axis, between intermediate rings and the outer ring exsits the steel balls, can be subjected to bi-directional axial load. The outer ring of pressure ball bearings have plane seat type, aligning seat type and aligning washer seat type.

Uni-directional and bi-directional pressure ball bearings generally use steel stamping molding. Large-size bearings or special bearings use brass or mild steel turning retainer.

1,3-disc types: 511XX, $literal, 512XX, 514XX
2,5-disc types: 522XX, 523XX, 524XX

Single row angular contact ball bearings and Tolerances

Angular contact ball bearings

Angular contact ball bearings have raceways in the inner and outer rings that are displaced with respect to each other in the direction of the bearing axis. This means that they are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads.

The axial load carrying capacity of angular contact ball bearings increases with increasing contact angle. The contact angle α is defined as the angle between the line joining the points of contact of the ball and the raceways in the radial plane, along which the load is transmitted from one raceway to another, and a line perpendicular to the bearing axis.

SKF angular contact ball bearings are produced in a wide variety of designs and sizes. Those commonly used and included in this catalogue are
– Single row angular contact ball bearings

Single row angular contact ball bearings can accommodate axial loads acting in one direction only. Under radial loads a force acting in the axial direction is produced in the bearing, and this force must be counteracted. Consequently the bearing is normally adjusted against a second bearing.

Normally SKF single row angular contact ball bearings have one high and one low shoulder. Some bearings, particularly those of Diameter Series 8 and 9, have an inner ring with two high shoulders as in a deep groove ball bearing. The low shoulder on one or both rings enables a large number of balls to be incorporated in the bearing, thus giving the bearings a relatively high load carrying capacity. They are of non-separable design.

The contact angle α is 40°, designation suffix B, for the most common sizes. For larger bearings contact angles of 25° and 30° are the most common, designation suffixes AC and A respectively.

SKF single row angular contact ball bearings are produced in two versions
– basic design bearings (not universally matchable) – can only be used for arrangements with single row ball bearing
– bearings for universal matching.

The larger sizes are produced exclusively as universally matchable bearings.

– double row angular contact ball bearings
– four-point contact ball bearings

Single row angular contact ball bearings

Single row angular contact ball bearings can accommodate axial loads acting in one direction only. Under radial loads a force acting in the axial direction is produced in the bearing, and this force must be counteracted. Consequently the bearing is normally adjusted against a second bearing.

Normally SKF single row angular contact ball bearings have one high and one low shoulder. Some bearings, particularly those of Diameter Series 8 and 9, have an inner ring with two high shoulders as in a deep groove ball bearing. The low shoulder on one or both rings enables a large number of balls to be incorporated in the bearing, thus giving the bearings a relatively high load carrying capacity. They are of non-separable design.

The contact angle α is 40°, designation suffix B, for the most common sizes. For larger bearings contact angles of 25° and 30° are the most common, designation suffixes AC and A respectively.

SKF single row angular contact ball bearings are produced in two versions
– basic design bearings (not universally matchable) – can only be used for arrangements with single row ball bearing
– bearings for universal matching.

The larger sizes are produced exclusively as universally matchable bearings.

Dimensions

The boundary dimensions of SKF single row angular contact ball bearings are in accordance with ISO 15:1998.

Tolerances

Basic design SKF single row angular contact ball bearings for single mounting are produced to Normal tolerances. Standard design universally matchable bearings are manufactured to better than Normal tolerances.

SKF Explorer angular contact ball bearings are manufactured only as bearings for universal matching with P6 dimensional accuracy and P5 running accuracy.

Large bearings having an outside diameter of approximately 400 mm and above have dimensional accuracy to tolerance class Normal and running accuracy to tolerance class P6 as standard.

The values for tolerances correspond to ISO 492:2002.

Resource From http://www.skf.com/portal/skf/home/products?lang=en&maincatalogue=1&newlink=1_3_6