1 Overview
Bearing axis of rotation of the various mechanical or moving parts of the bearing components, but also rely on the rolling element rolling bearing components on the host rotation. Rolling bearings and plain bearings have many advantages, the rolling bearing application time is later than the plain bearings, main bearing type of modern machinery, is widely used in the bearing areas of the primacy.
2 Bearing structure and working principle
Rolling bearings usually by the outer ring, inner ring, rolling body cage of four main components. Also a small number of structure without inner or outer ring or no ring, composed of three parts or two parts.
The rings, also known as a seat, divided into inner and outer rings, thrust bearing, compared with a tight circle and living circle. The round surface of the ball bearing inner cylindrical surface and the outer circle has a raceway (ditch) and the guide wheel and limit the movement of side of the rolling element, but also played a contact surface increases the rolling element and the circle, and reduce the contact stress .
Rolling element is to ensure that the parts of the rolling friction between the bearing inner and outer rings, the shape of the size and number of direct impact on the rolling bearing load capacity and performance.
Cage is to keep the adjacent rolling bodies in direct contact to ensure that the bearing rotating flexible. Bearings of various structures in order to meet the need to adopt the structure type and material of the cage.
Bearing according to can bear the load of the direction and type of rolling element, divided into ten types:
(1) single row radial ball bearings (deep groove ball bearings);
(2) to the spherical ball bearings (aligning ball bearings);
(3) to the heart of a short cylindrical roller bearings;
(4) radial spherical roller bearings;
(5) radial long cylindrical roller bearings and needle roller bearings;
(6) to the heart of spiral roller bearings;
(7), angular contact ball bearings (angular contact ball bearings);
(8) tapered roller bearings;
(9) thrust ball bearings;
(10) thrust roller bearings.
Bearing tolerance class code with the Latin alphabet B, C and D and E, (EX), G, in order from high to low, said tolerance level. Class G general bearing code can be omitted, but the bearing clearance group Code, shall not be omitted.
3  rolling bearing test
Rolling finished testing is based on the current national standard: JB3371-83 "Rolling its commodity parts inspection rules"; GB307.3-96 "Rolling the general technical conditions"; GB308.-89 "Rolling ball"; GB307.1 -94 "Rolling tolerance"; SN/T0234-93 "export for the inspection of rolling bearings.
Rolling bearing sample test items, divided into a critical test items, test items, and a secondary test items.
(1) The key test items: (1) crack; 2 wrong materials; ③ wrong model.
4  The main production plant and exports to countries, regions
Export manufacturers: Harbin Bearing Factory Bearing Factory, Luoyang Bearing Factory and Shanghai Bearing industrial companies, export specifications to the "O" Class A common class of small and medium bearing, miniature bearings and large bearings, and 7 class automotive bearings. Exports to countries and regions around the world.
5 Packing and storage
(1) Inner packing: outside diameter of Φ28-52mm bearings every 5 sets or 10 sets a polyethylene plastic boxes or 5 sets, 10 to apply polyethylene composite paper roll package. The outside diameter greater than Φ52-80mm bearings, 5 sets, 10 to apply polyethylene composite paper roll package. The outer diameter greater than Φ80-190mm bearing, using a single set of polyethylene film packaging, single suit tray. In large quantities to the bearings of the same user, by mutual agreement, can be simple packaging.
(2) packaging: Bearing Inner packing into cartons or wooden storage.
(3) transport and storage: during transport to prevent the rain and prevent rough handling. Storage should be placed in a ventilated and dry around the coffers of the corrosive gas.


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