This standard specifies the main dimensions of flat transmission belts, their limit deviations and measurement methods. This standard is applicable to flat transmission belts with various materials as the skeleton. GB/T 4489-2002 Dimensions and tolerances of flat transmission belts GB/T4489-2002 Standard download decompression password: www.bzxz.net

ICs 21.220.10
t：42
National Standard of the People's Republic of China
GB/T4489—2002
Generation: standards
Flat transmission belts
Dimensions and tolerances of flat transmission belts
Pincnsions aud toleracts
Iso22.lg9l.Belt drivesFlatitansrmissiorbeits zndlcorrespording nu.leysDimensions and tolerances,M(D)2002-10-16 Issued
Shandong People's Republic of China
National Quality Supervision and Inspection General Standard
2003-04-01 Implementation
GB/T 4489-2002
This standard adopts 1S22,199 section Dimensions and Tolerances of Flat Drive Belts and Pulleys (English version 3). This standard replaces the width and length of GT-10 flat drive belts. Due to the international development of the original standard, the original standard was re-drafted based on 15(>32,1501. In order to ensure product quality, this standard was supplemented when the international standard was adopted. This supplemented the vertical line mark and placed the blank space for the clauses involved in the provisions. The main differences between the original standard and 1522:1 are as follows: Delete the provisions of the fourth empty pulley and the part of the step pulley because there are related flat drive belt pulleys in the next standard: Add the provisions for the end pulley Because most of the flat belts produced in my country are of standard, the company uses it to ensure the use of the flat belts.
According to 51, the determination of the length of the wide-area belt (Xie Sha A)" is unified, so as to make it safer! The provisions of the horizontal difference and the test force method (Appendix 3) are added to prevent the flat belt from deflecting during transmission! The provisions of the flat belt line avoidance are added to prevent the flat belt from deflecting during transmission. In order to facilitate use, the bidder also made some systematic changes: a) \This international standard\ is changed to \This standard\: 5) The front tone of the international standard.
This standard has the following main changes compared with GB44991: For the standard parts of the long island deflow of the annular flat belt, the second series (2.1 of the 1st edition) is added. 1. 3).
In addition to the actual requirements for the belt wheel size and its source of deviation, the semi-width variation of the wheel width is listed in the normative Appendix 4 (Appendix A-1 of the 19th edition);
The provisions on the semi-width variation of the belt model and the measurement method are added (see Appendix); The provisions on the linear seat and measurement method of the flat belt are added (see Appendix). Appendix A and Appendix A of this standard are normative requirements, and the appendix is ​​a data appendix. This standard is proposed by the State and the chemical industry. This standard is the main source of the chemical industry tape standard. The two companies are Qingxi Rubber Research Institute and Hunan East Asia Rubber Co., Ltd. Drafters of this standard: Han Deshen, Yonglu, Wen Qingwu, the standard was first published in June 1981, and the first revision is planned for autumn. Scope
Dimensions and tolerances of flat transmission belts
CB/T44892002
This standard specifies the dimensions and tolerances of flat transmission belts and the methods of measurement. This standard applies to flat transmission belts of all types. 2 Length
2.1 Length of endless belts
2.1.1 The endless belt length specified in this standard is the length under normal installation tension. For the method of implementation, please refer to the attached requirements. 2.2 Flat belt manufacturers should consider the length under normal installation tension and the length under no tension. The difference in length is determined by the manufacturer and the buyer. 2.1.3 The length of the belt is specially recommended (optional series). The manufacturing meets the R21 tax system. Other numbers must be R1. 2.1.1 The length of the flat belt supplied in the form of a ring section shall not exceed 6.5% of the specified length. 2.2 The length of the flat belt supplied by the buyer shall be determined by the supplier. The actual length of the belt is usually determined by the manufacturer. The actual difference is 10%. The length should meet the requirements of Table 2. The error of the width and density of the belt should not be greater than 5rm, and the error of the half-length film should be less than 5rm. The error of the half-length film should be less than 5rm. The error of the half-length film should be less than 5rm. The error of the half-length film should be less than 5rm. The error of the half-length film should be less than 5rm. The error of the half-length film should be less than 5rm. The error of the half-length film should be less than 5rm. The error of the half-length film should be less than 5rm. The error of the half-length film should be less than 5rm. The end of a 1Dm long line is made by the car. The point is the line. The line is measured at one end of the line. The maximum height between the points can be measured at the same side of the belt. The line is the line position. GB/T44892002
Preferred series
Table 1 Length of annular belt
Environmental series
If the series is not enough, it can be filled according to the principle: the series of two is not enough, come [2! Priority number system mouth effect, the length of the two systems,
Light trace the most
4: 31
Table 2 Provisions for the minimum length of flat belts with ends
Width of flat belt n
Table 3 Width of flat belt and its limit error
General industry
Unit of measurement
Series
Minimum length and width of flat belts
Single type meaning meter
A.1 Principle
Appendix 4
(Normative appendix)
Determination of the length of annular belts
GB/T44B92002
The length of the belt is determined by the measured or standard sum value, that is, the length of the flat belt is determined by the measured or standard sum value, that is, the length of the flat belt is determined by the measurement ... The difference in length under tension should not be exceeded.
A.2 Procedure
1.21 Measure the length of the flat belt in sections continuously and as accurately as possible. Measure each section. Make sure that the flat point H of this section is not subject to tension and is the starting and ending point of the non-standard measuring station.
A.2.24 The length of the flat belt should meet the requirements of A.2.2.1 and A-2.2.2 respectively. A.2.2.1 For belts with a length of less than or equal to 3m, the length of each section shall be 1 to 1/2 of the flat belt's common length. The longest section can be less than 1.
A.2.2.2 For belts with a length of less than 30m, the length of each section shall be less than 7.5m and not more than 1/1 of the flat belt's common length. The last section shall be less than 7. 5 m.
4.2.3 Measure the length of each section separately and find the sum of the values, which is the flattened length of the line. A.3 Calculation of the inner circumference
Flat belt inner length in cm according to the formula (A.1)j-elastic
light:
[internal length, in meters (m)]
self-permanent length, in meters (mm):
belt thickness, in meters (mm)
1: The inner length under the cross-tension is also determined by the cross-tension. The length of the flat belt should not be different from the length of the flat belt in inches. A.:
: Formula (1) is used for flat belts with no surface conditions, etc. It is obviously only used for homogeneous materials. The modified formula can be strictly correct: it can be said to be sufficiently accurate for transmission belts. GB:T44892002
B.1 Appendix B
[Model Record]
Determination of thickness and thickness deviation of flat belts
The measurement of flat belts is combined with the following special requirements. Small day is greater than .1.
b half head diameter.
When the sample mass is large or equal to 31R1 point, the test can be carried out (23 ± 5ka hand: detailed small RD head for sample + inner
B.2 test
5 sample production terrain, along the flat book floor direction to take, its length is the full width of the flat section, its width is m, connect the B1 war sample mark value on the same axis of the test to mark the three reading points -
Imf-1o9
Figure. 1 Determination of measurement points
B.3 Procedure
Make the liquid head 7 times to form each measurement point and control the requirements of 1 and add pressure and guide the quantity. Find the over-range value of the arbitrary network width measurement), take the selected difference as the relevant value, find the small and medium-sized width measurement, and make the maximum value of the width measurement. Appendix 'bzxz.net
[Information]
The recommended corresponding relationship between flat belt width and wheel width The recommended corresponding relationship between flat belt width and wheel width is shown in Table 1. Table
Flat belt width and wheel width obstruction check rate
Medium bandwidth standard
One bandwidth court
GB/T 44892002
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