Rolling bearing: in support of the load and relative motion between the parts of the rolling motion of the bearing, it includes the parts of the raceway and with or without isolation or guide parts of the rolling body group. Can be used to bear radial, axial or radial and axial combined load.

Angular contact bearing: ball and ring nominal contact angle greater than 0 °, and less than 90 ° rolling bearing.

Outer spherical bearing: there are outer spherical surface and with locking member of the wide inner ring of the centripetal rolling bearing. Mainly for simple shell use.

Linear motion bearings: two raceways in the rolling direction with relative linear motion of rolling bearings.

Ball bearing: rolling bearing whose rolling body is ball.

Deep groove ball bearings: each ring has a cross-section of about one-third of the circumference of the ball continuous groove type raceway of the centripetal ball bearings.

Thrust ball bearing: the rolling body is the ball of the thrust rolling bearing.

Roller bearing: rolling body is the roller rolling bearing.

Cylindrical roller bearings: the rolling body is cylindrical roller radial rolling bearings.

Tapered roller bearings: the rolling body is the tapered roller radial rolling bearings.

Needle roller bearings: the rolling body is the needle roller centripetal rolling bearings.

Spherical roller bearings: rolling body is convex spherical or concave roller spherical roller bearings. There are convex spherical roller bearings, the outer ring has a spherical raceway; there are concave roller bearings, the inner ring has a spherical raceway.

Thrust roller bearings: rolling body is the roller thrust rolling bearings.

Thrust cylindrical roller bearings: the rolling body is the cylindrical roller thrust rolling bearings.

Thrust tapered roller bearings: the rolling body is the tapered roller thrust rolling bearings.

Thrust needle roller bearings: the rolling body is the needle roller thrust rolling bearings.

Thrust spherical roller bearings: the rolling body is convex spherical or concave roller spherical thrust rolling bearings. There are convex spherical roller bearing seat ring of the raceway for the spherical shape, there are concave spherical roller bearing shaft ring of the raceway for the spherical shape.

With seat bearing: to the heart of the bearing and seat combined together a component, in parallel with the bearing axis line of support surface has a mounting screws on the bottom plate.

Joint bearing: sliding contact surface for spherical, mainly for oscillating motion, tilting motion and rotary motion spherical plain bearing.

Combined bearing: a set of bearings within the same time by the above two bearing structure form combination of rolling bearings. Such as needle roller and thrust cylindrical roller combination bearings, needle roller and thrust ball combination bearings, needle roller and angular contact ball combination bearings, etc.

Other bearings: in addition to the above other structure of rolling bearings.

1. Basic code Imported bearings

A basic code used to indicate the bearing bore, diameter series, width series and type, generally up to five digits, first divided as follows.

(1) bearing bore with the basic code right from the first, H-bit digital representation. For the common inner diameter d = 20 ~ 480mm bearing bore is generally a multiple of 5, the two numbers indicate the bearing bore size by 5 divided by the quotient, such as 04 said d = 20mm; 12 said d = 60mm and so on. For the inner diameter of 10mm, 12mm, 15mm and 17mm bearings, inner diameter code for 00, 01, 02 and 03. For inner diameter less than 10mm and more than 500mm bearings, the inner diameter of the method otherwise specified, see GB / T272-93.

(2) bearing diameter series (i.e., the same structure, the same inner diameter bearing in the outer diameter and width of the change in the series) with the basic code from the right of the third digit. For example, for to the heart bearing and to the heart thrust bearing, 0, 1 indicates that the special light series; 2 indicates that the light series; 3 indicates that the series; 4 indicates that the heavy series.

(3) bearing width series (that is, the structure, bore and diameter series are the same bearing width variation series) with the basic code from the fourth digit from the right.

Diameter series code and width series code is collectively referred to as the size series code.

(4) bearing type code with the basic code right from the fifth digit (for cylindrical roller bearings and needle bearings and other types of code for the letter).

2、Back code

The rear code of the bearing is used letters and numbers to indicate the structure of the bearing, tolerance and special requirements of materials, etc.. There are a lot of post designations, the following are a few common designations.

(1) Internal structure code is to indicate the different internal structure of the same type of bearing, with letters followed by the basic code. Such as: contact angle of 15 °, 25 ° and 40 ° of the angular contact ball bearing with C, AC and B, respectively, to indicate the different internal structure.

(2) bearing tolerance level is divided into 2, 4, 5, 6, 6X and 0, a total of 6 levels, in order from senior to low, its code / PZ, / P4 '/ PS, / P6, / P6X and / PO. tolerance level, 6X level only for tapered roller bearings; 0 level for ordinary level, in the wheel bearing code is not marked.

(3) common bearing radial clearance series is divided into 1 group, 2 groups, 0 groups, 3 groups, 4 groups and 5 groups, a total of 6 groups, radial clearance in order from small to large. o group clearance is commonly used clearance groups, in bearing code is not marked, the rest of the clearance groups in bearing code with / CI, / CZ, / C3, / C4, / CS respectively.

3、Preceding code

The bearing's front code is used to indicate the bearing's sub-parts, with letters. For example, L indicates the separable ring of the separable bearing; K indicates the rolling body and cage assembly of the bearing, etc.

The actual application of rolling bearing type is a lot, the corresponding bearing code is also more complex. The above code is the most basic and common part of the bearing code, familiar with this part of the code, you can identify and check the common bearings.