Brief introduction of deep groove ball bearing
Deep groove ball bearings are non-separable bearings. This kind of bearing has the advantages of simple structure, no need for frequent maintenance during work, etc., and the price is relatively cheap. It is an extremely widely used radial bearing, suitable for use under high-speed operating conditions.
The inner and outer rings of single row deep groove ball bearings have deep groove raceways. The deep groove raceways and the excellent closeness between the raceways and the steel balls make this type of bearing bear radial load while at the same time. It can also bear a certain bidirectional axial load. When the radial clearance of the bearing is appropriately increased, the ability to withstand the axial load can be increased, and sometimes it can be used to replace the angular contact ball bearing running at high speed.
Deep groove ball bearings have a variety of structural types. In addition to the general open bearings, they can also provide customers with single-sided dust cover, double-sided dust cover, single-sided seal ring and double-sided seal ring. Type structure, and contact or non-contact (low friction) seal ring bearings. According to the contact form, the sealing ring is divided into contact type and non-contact type (low friction). Bearings with double-sided seals are filled with grease before leaving the factory. The grease filling amount is generally 25% to 35% of the effective space in the bearing. If customers have special requirements, they can also fill other types of grease or adjust the filling amount . Bearings with sealing rings on both sides should not be cleaned or heated (cannot be heated by oil) over 80°C during installation. Otherwise, the bearing will be easily damaged or the grease will be degraded and lost. Bearings with sealing rings can maintain their proper performance in the ambient temperature range of –30℃～+100℃.
Bearings with retaining grooves in the outer ring
A deep groove ball bearing with a stop groove on the outer ring can also be provided. The bearing can be positioned by a stop ring, and the bearing can be easily fixed in the bearing seat during installation. Therefore, when the installation location is restricted, priority should be given to selection. According to the different characteristics of the bearing application, the above-mentioned dust cover, sealing ring, stop groove, etc. can also be implemented in various combinations and provided to customers.
Low noise bearing
In order to meet customers’ special requirements for low noise (low vibration) of bearings, deep groove ball bearings of different vibration value groups can be provided to customers. The mark of vibration value group is indicated in the post code after the basic code of the bearing.
It can also provide customers with deep groove ball bearings of other structures, such as insulated deep groove ball bearings, ceramic deep groove ball bearings, stainless steel deep groove ball bearings, and many other products. The product is not included in this catalog for some reasons. If the customer needs it, please consult the technical department.
It can also design and manufacture other deep groove ball bearing products that meet the individual requirements of customers.
Deep groove ball bearing cages are mostly stamped steel plate corrugated cages, there are also car-made (steel or brass) solid cages, and engineering plastic cages such as glass fiber reinforced nylon 66.
Axial load carrying capacity
If the deep groove ball bearing needs to bear pure axial load, under normal circumstances, the pure axial load shall not exceed 0.5C0. Bearings with small dimensions (with an inner diameter of approximately less than 12mm) and light series bearings (diameter series 8, 9, 0 and 1) must not bear an axial load exceeding 0.25C0. Excessive axial load may greatly reduce the life of the bearing.
In order to ensure a good running state of the bearing, deep groove ball bearings, like other ball bearings and roller bearings, must be applied with a certain amount of small load, especially for high speed, high acceleration, or under conditions of frequent changes in the load direction jobs. Because of these working conditions, the inertial force of the ball and the cage and the friction in the lubricant will adversely affect the rolling and rotation accuracy of the bearing, and there may be harmful sliding motion between the ball and the raceway.
The small load required by deep groove ball bearings can be estimated with the following formula:
V—Viscosity of lubricating oil at working temperature, mm2/s
n— Rotation speed, r/min
dm — the average diameter of the bearing, dm = 0.5(d+D), mm
Kr — Smaller load constant.
When the bearing starts at a low temperature or the lubricant viscosity is high, a larger and smaller load may be required. Under normal circumstances, the weight of the bearing support itself plus the load borne by the bearing has exceeded the required small load. If the load has not been reached, the bearing must be subjected to additional radial load to meet the requirements of the smaller load. In the application of deep groove ball bearings, generally the axial relative position of the inner and outer rings can be adjusted or springs can be used to apply axial preload.
Dimensions, tolerances, clearance
The outer dimensions of the standard deep groove ball bearings conform to GB/T307.1 “Rolling Bearing Radial Bearing Overall Dimensions”, the tolerances conform to GB/T307.1 “Rolling Bearing Radial Bearing Tolerances”, and the clearance conforms to GB/T4604 “Rolling Bearing Radial Bearings” Clearance” and other regulations.
The dimensional tolerance grade of standard deep groove ball bearings is generally manufactured according to P0 (ordinary grade), and the clearance is made according to group 0 (basic group). If the customer has other special dimensions, tolerances, and clearances (including non-standard), they can also Provide corresponding products.
Equivalent dynamic load
The equivalent dynamic load of a deep groove ball bearing is not only related to the ratio of the axial load borne by the bearing to the basic static load rating, but also different radial clearances will also affect the equivalent dynamic load. The radial clearance increases and the shaft The bearing capacity also increases accordingly. For deep groove ball bearings under dynamic load, the equivalent dynamic load can be calculated as follows:
When Fa / Fr ≤e P = Fr
When Fa / Fr ＞e, P = XFr + YFa
P— Equivalent dynamic load, N
Fa— Axial load, N
Fr— radial load, N
X — Radial load factor
Y— Axial load factor
Equivalent static load
For deep groove ball bearings under static load, the equivalent dynamic load can be calculated as follows:
Po = 0.6Fr + 0.5Fa
When Po <Fr, Po = Fr
The Series of deep groove ball bearings