How many years is the latest national standard for deep groove ball bearings?

Standard number: GB T 276-1994

Standard Name: Rolling Bearing Deep Groove Ball Bearing Dimensions.

Standard Status: Active.

Alternate situation: GB 276-1989 GB 277-1989 GB 278-1989 GB 279-1988 GB 4221-1984

Date of implementation: 1995-10-1

Promulgating Departments: State Bureau of Technical Supervision.

Brief introduction: This standard specifies the dimensions of deep groove ball bearings with GB rolling bearings and radial bearings, deep groove ball bearings with stopper grooves in the outer ring, deep groove ball bearings with dust caps and deep groove ball bearings with sealing rings.

Standard number: GB T 15276-1994

Standard Name: Information Processing System Information Exchange between Systems The quality of the signal transmitted synchronously at the DTE DCE interface.

Standard Status: Active.

Date of implementation: 1995-8-1

Promulgating Departments: State Bureau of Technical Supervision.

Brief introduction: This standard specifies signal quality requirements for serial data transmission at the interface between the data terminal equipment (DTE) and the data circuit termination equipment (DCE) for synchronous transmission. The signal quality requirements specified in this standard are limited to synchronous transmission at interfaces with synchronous DCE.

Signal quality related to asynchronous DTE is not an integral part of this standard. This standard considers that the performance of signal quality needs to be classified according to the type of signal timing interchange circuit used at the interface. There are two types of timing to consider, co-directional timing and reverse timing.

Standard search network to find relevant standards to see.

GB T 276-2013 "Rolling Bearings - Deep Groove Ball Bearings - Dimensions".

GB T 28698-2012 "Rolling bearings - Technical specifications for deep groove ball bearings for motors".

GB T 32321-2015 "Rolling Bearings - Sealed Deep Groove Ball Bearings - Test Regulations for Dustproof, Grease Leakage and Temperature Rise Performance".

GB T 32325-2015 "Rolling bearings - Technical conditions for vibration (speed) of deep groove ball bearings".

GB T 36222-2018 General Specification for Deep Groove Ball Bearings for Aviation Motors

FYI.

What is the fit tolerance of a deep groove ball bearingThe fit tolerance of a bearing is the sum of the tolerances of the bore and shaft that make up the fit. It is the amount of movement that allows for a gap or interference. The size of the tolerance zone and the position of the tolerance zone of the bore and shaft form the fit tolerance.

The magnitude of the hole and shaft fit tolerance indicates the fit accuracy of the hole and shaft. The size and position of the bore and shaft fit tolerance zone indicate the fit accuracy and fit nature of the hole and shaft. The size of the fit tolerance The size of the tolerance zone; Fit Tolerance Zone Size and Position Fit Nature.

Grades and tolerance zones for fit tolerances: The selection of tolerance grades is related to the tolerance class of the shaft or housing bore in which the bearing is mated and the bearing accuracy. The tolerance level of the shaft mated with the P0 precision bearing is generally IT6, and the housing bore is generally IT7.

For occasions with high requirements for rotation accuracy and smoothness of operation (such as motors, etc.), the shaft should be selected as IT5 and the bearing seat bore as IT6. Selection of tolerance zones The tolerance zones of shafts on which radial bearings and angular contact bearings are mounted refer to the corresponding tolerance zone table. In most cases, when the shaft rotates and the radial load direction does not change, i.e. the bearing inner ring rotates relative to the load direction, a transition or interference fit should generally be chosen.

When the stationary shaft and the radial load direction remain unchanged, that is, when the bearing inner ring is stationary relative to the load direction, a transition or small clearance fit can be selected. Fitting tolerance standard between bearing and shaft When the bearing inner diameter tolerance zone and the shaft tolerance zone form a fit, the tolerance code of the original transition fit in the general base hole system will become an over-winning fit, such as K5, K6, M5, M6, N6, etc., but the over-winning amount is not large; When the bearing bore tolerance generation is matched with H5, H6, G5, G6, etc., it is not a clearance but a winning fit. Bearing outer diameter tolerance zone because the tolerance value is different from the general reference shaft, is also a special tolerance zone, in most cases, the outer ring is installed in the shell hole is fixed, some bearing components structure requirements need to be adjusted, its fit should not be too tight, often with H6, H7, J6, J7, JS6, JS7 and so on.

Through the analysis of the fit tolerances of deep groove ball bearings, we can already learn more about deep groove ball bearings. Nowadays, deep groove ball bearings have an important position in the fields of low-noise motors, motorcycles and general machinery, precision instruments, etc., and accelerating the research of deep groove ball bearings has become the focus of many experts and scholars. Deep groove ball bearings are the most common type of rolling bearings.

The basic type of deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of retaining frames. There are two types of deep groove ball bearings: single row and double row, and the deep groove ball structure is also divided into two structures: sealed and open, open means that the bearing does not have a sealed structure, and the sealed deep groove ball is divided into dustproof seal and oil-proof seal. In general, the upper difference of the inner and outer diameter tolerances of the bearing is 0, and the lower difference is a negative value.

Such as deep groove ball bearing 6206, the inner hole diameter is 30mm, and the deviation is 0; The outer diameter of the bearing is 62mm and the deviation is 0. The specific bearing tolerances are determined according to the accuracy class of the bearing, and the basic dimensions are determined according to the standard.

The national standard of bearings has the following two points:

1. National standard for vibration acceleration (commonly known as Z standard).

The standard was formulated relatively early, to measure the vibration acceleration value of the bearing when it rotates, to determine the quality level of the bearing, divided into Z1, Z2, Z3 from low to high three quality grades. At present, domestic bearing manufacturers are still using, to measure the quality of the bearing by the vibration acceleration value, which simply reflects the fatigue life of the bearing.

2. Vibration speed standard (commonly known as V standard).

Since the original vibration acceleration standard has not been abolished, the standard is based on the standard issued by the Ministry of Machinery Industry, which is formulated with reference to the European standard in combination with the actual situation and needs of our country, in order to detect the vibration speed of the bearing to divide the quality level of the bearing (equivalent to the national standard). It is divided into five vertical quality grades: V, V1, V2, V3, and V4.

The quality grades of various ball bearings from low to high are V, V1, V2, V3, V4; The quality level of roller bearings (cylindrical, conical) from low to high is V, V1, V2 and V3.

Bearing classification. 1. Sliding bearing.

Plain bearings are not divided into inner and outer rings and have no rolling elements, and are generally made of wear-resistant materials. It is often used in low-speed, light-loaded, lubricating and difficult to maintain mechanical rotating parts.

2. Spherical bearings.

The sliding contact surface of the spherical bearing is spherical, which is mainly suitable for oscillating motion, inclined motion and rotary motion.

3. Rolling bearings.

Rolling bearings are divided into radial bearings and thrust bearings according to the different load directions or nominal contact angles they can bear.

According to the shape of the rolling elements, it can be divided into ball bearings and roller bearings. Roller bearings are divided into cylindrical roller bearings, needle roller bearings, tapered roller bearings and spherical roller bearings according to the type of roller shed.

Deep Groove Ball Bearing Tolerance Standards The position and size of the tolerance bore of the deep groove ball bearing tolerance bore is different from that of the general reference bore, and the bore of (g and e) or (0 and 6) rolling bearings is based on the position of the special tolerance zone. When the bearing bore tolerance zone and the shaft tolerance zone form a fit, the tolerance code of the original transition fit will be changed to an over-match in the general base hole system, such as K5, K6, M5, M6, N6 and other ,..The bearing outer diameter tolerance zone is also a special tolerance zone because the tolerance value is different from the general reference shaft, in most cases, the outer ring is fixed when installed in the housing hole, and some bearing components need to be adjusted ,.. structural requirements

The selection is related to the accuracy of the rolling bearing: the shaft mated to the G(0) class bearing, the tolerance class is generally IT6, and the housing bore is.

The bunk and size of the inner diameter of the deep groove ball bearing are different from the general reference hole, the inner diameter of the (g and e) or (0 and 6) rotating bearings is a reference hole with a special tolerance zone bunk, and the tolerance zone of the inner diameter of the bearing of each precision category is arranged downward from the zero line, the upper deviation is zero, and the lower deviation is negative. The position of the outer diameter of the deep groove ball bearing is similar to that of the base shaft system, and it is arranged downward from the zero line. 3. The employment is related to the accuracy of the rolling bearing

It depends on the specific use conditions, for example, the weight of the shaft is rotated, the speed is high, and the load is large, so the tightening is very small; If it is a static load, it can be loosened; It also depends on the installation method, if the inner and outer rings are installed at the same time, it should be looser for the device to be easy to calculate;