Double Row Deep Groove Ball Bearings

Double row deep groove ball bearings have two rows, which require a certain distance between them. Apart from the distance between rows, there are also some other parameters to consider. This article will go through some of them: Applications, Characteristics and Dimensions. It also contains information about their contact surfaces.

Application examples

Double row deep groove ball bearings are used in applications where a radial load is required. These bearings feature deep grooves in the bearing rings and a narrow osculation between the balls and raceways. The axial load carrying capacity of these bearings is dependent on their size, internal construction, and operating clearance. Excessive axial load can reduce the life of the bearings and increase running noise.

Application examples for double row deep groove ball bearing include pumps, electric motors, general machinery, and food & marine applications. They can also be used in washing machines and other domestic appliances.

Characteristics

Double row deep groove ball bearings are similar to single-row deep groove ball bearings, except that the double-row design has two rows instead of one. The double-row design is characterized by two separate radial races. The inner race is movable and rotates at 10000 rpm, while the outer race is fixed to the ground. The bearing is lubricated with SAE 30 oil and operates at 100 degC. The radial load carrying capacity of a double-row deep groove ball bearing depends on the bearing series and its dimensions. For instance, the series 618 and 619 have smaller cross-sections and cannot support the same loads as series 60. Conversely, series 60 has larger cross-sections, and can support the same loads as series 618 or 619, without exceeding the maximum permitted axial load

The steel grade is another important factor. While most bearings are made of chrome steel, stainless steel is hard to temper and has lower load ratings. The grades of stainless steel used in deep-groove ball bearings include AISI 420, AISI 440C, and AISI 316L. When choosing a bearing, be sure to check the metric designation and the noise/vibration grade.

Dimensions

The dimensions of double row deep groove ball bearings differ from single row deep groove ball bearings. Single row deep groove ball bearings have a standard cage that is made of brass or sheet steel. Double row deep groove ball bearings typically use a cage made of glass fibre reinforced polyamide PA66. These bearings have different load ratings depending on their suitability for high speed operation and higher temperatures.

The size and type of double row deep groove ball bearings must be determined by the application. The speed of the double row deep groove ball bearing must be in proportion to the required operating speed. Generally, double row deep groove ball bearings are available in sizes between 0.7 inch.

Contact surfaces

Deep groove ball bearings must withstand sufficient radial loads to prevent slippage. Usually, the radial load is much higher than the requisite minimum load because of the weight of the supported parts and external forces. To verify the validity of the proposed method, experiments were performed.

Double row deep groove ball bearings have a design similar to single row deep groove ball bearings, including deep raceway grooves and close osculation of the balls. They have a larger load-carrying capacity than single row deep groove ball bearings. In addition, double row deep groove ball bearings are wider than single-row bearings.

Grease used

The proper lubrication is essential for ball bearings and ensures optimal performance. It also prevents corrosion and ensures long service life. There are two main types of lubrication: grease and circulating oil. Grease is preferred because of its high temperature resistance and ease of change. However, it is more expensive and requires more labor to clean.

The type of grease used on double-row deep-groove ball bearings should be chosen carefully. Some types of greases have specific temperature ranges that can reduce service life. Others have a wide range of temperature capabilities.