Some standard content:
National Standard of the People's Republic of China
Synchronous belt drives
Synchronous belt drives-PulleysThis standard refers to IS05294-1979 "Synchronous belt drives-Pulleys". Subject content and scope of application
GB11361-89
This standard specifies the basic characteristics of pulleys in synchronous belt drives used to transmit mechanical power, correctly position or realize synchronous motion, including: the size and limit deviation of gear teeth, the size and limit deviation of pulleys, and the form and position tolerance of pulleys. This standard is applicable to general industrial synchronous pulleys, not automotive synchronous pulleys. 2 Reference standards
GB6931.3 Synchronous belt drive terminology
GB11362 Calculation of rated power and transmission center distance of synchronous belt drives GB11357-89 Pulley material, surface roughness and balance 3 Tooth shape, size and limit deviation
The tooth profile of pulleys has two types: involute teeth and straight teeth. 3.1 Involute tooth profile tool
Machining involute tooth profile tool---The basic dimensions and limit deviations of rack tools are shown in Figure 1 and Table 1. Figure 1
Approved by the State Administration of Technical Supervision on June 12, 1989 and implemented on January 1, 1990
Number of teeth of pulley Z
Pitch 6±0.003
Tooth half angle A±0.12°
Tooth height-h,*g.0
Tooth quality matching 6. *9.%
Tooth top web angle radius±0.08
Tooth root fillet radius0.03
Two times the pitch distance28
3.2 Straight-sided tooth profile
GB 11861-89
The dimensions and limit deviations of straight-sided tooth profile are shown in Figure 2 and Table 2. XXL
14 ~ 19
2.794 3.048
4.2 Pulley diameter
Pulley width code
4.2.1 See Figure 4 and Table 5 for pulley diameter.
GE11361-89
Basic size
Double reverse retaining ring pulley
Minimum density bf
Minimum width 5 for retaining ring pulley
Single-side retaining ring pulleybzxz.net
Minimum width b
Top pitch
GB11361-89
72.26 116. 43 115. 92
90.961 90.20
Pitch line
Pitch circle
71.39127.34
124. 55 181.91 178. 86
131.62 192.02 188. 97
138.69202.13199.08
145.7721.23209.18
152. 84222. 34 21 9. 29
159, 92 232. 45|229. 40 | |tt | 259,72
191,01188.222
109.1510 7.78
272, 87269. 82
113.19111.82198.08195.292
282. 98229. 93
121.28119.90
303.19300.14
212.23200.44
129.3612 7.09226.38223.59323.40320.35145.53114.16254.68251.89363.83360.78161.70 160.33
194.04192.67
242. 55241 18
282.98 280.18 404.25401.21
339.57 336.78485.10482.06
424.47421.67606. 38 603, 33
217.53291.0s289.69509.36506.57]727.66724.61218.30||tt ||339.57338.20594.25591.46848.93845.88254.68
291.06290.30 388.08386.71679.15676.35970.21967.16485, 10| 48 3. 73848. 93 846. 141212.76|12 09.71363.83363.07
630.64629.26
Note: The dimensions in brackets are not applicable. 4.2.2 Limit deviation of pulley outer diameter
See Table 6 for the limit deviation of pulley outer diameter.
Outer diameter d range
>25.40~50.80
250.80~101.60
101.60 ~ 177. 80
>177.80~304.80
> 304. 80 - 508. 00
508,00
4.3 Pulley retaining ring dimensions
The pulley retaining ring dimensions are shown in Figure 5 and Table 7.
da—pulley dimension, mm:
d—diameter of the retaining ring at the bend, mm
dw=tu + (0.38 ±0.25)#
de——retaining ring outer diameter, mm,
dr =dw+2K,
GB11861-89
Acute angle undercut
Minimum height (K)
Ring thickness t
0. 5~1. 0
GB11361—89
1. 0 ~ 1. 5
Note: The structural type of the retaining ring shall be agreed upon by the manufacturer and the user. 4.4 Pulley shape and position tolerances
4.4.1 End face circular runout
The end face circular runout tolerance of the two sides of the pulley wheel to the axis of the hole is shown in Table 8 and Figure 6, both sides
Outer diameter d, size range
End circular runout tolerance
4.4.2 Diameter circular runout
.101.60
101. 60 ~ 254. 00
d,×0.001
The meridian runout tolerance of the pulley wheel to the axis of the hole is shown in Table 9 and Figure 7. Figure 7
5. Center ~ 6.5
0. 25 -(d, - 254. 00) × 0. 000 5 Outside diameter d, size range
Radial tolerance t?
GB11361-89
0.13 +(d,-203,20)×0.000 5
4.4.3. Parallelism
The pulley teeth shall be parallel to the axis of the shaft hole, and the tolerance value t shall not exceed 0.001mm per millimeter of wheel width. When the wheel width is less than 10mm, the parallelism is calculated as 10mm.
4.5 Taper
Within the pulley outer diameter tolerance range given in Table 6, the maximum taper t per millimeter of wheel width is 0.001mm. When the wheel width is less than 10mm, the taper is calculated as 10mm.
5Other quality requirements for pulleys
The material, surface roughness and balance of the pulley shall comply with GB11357-89 "Material, surface roughness and balance of pulleys" 6Marking of pulleys
The marking of pulleys consists of the number of teeth on the wheel, the type of belt and the wheel width code. Example:
Wheel width code 075 (wheel width 19.1mm)
Belt type H (pitch 12.7mm)
Number of teeth 32
A1 pulley
A1.1. Pulley retaining ring
Pulley retaining ring can be selected according to the following situations:
GB11361—89
Appendix A
Requirements for installation and use of synchronous belt transmission
(reference)
In a two-axis transmission, one of the two pulleys must have retaining rings on both sides, or there must be a retaining ring on different sides of the two pulleys. In a transmission where the center distance exceeds 8 times the diameter of the small pulley, both pulleys should have retaining rings on both sides. b.
In a vertical shaft transmission, one of the pulleys should have retaining rings on both sides, while the other pulleys in the system only have retaining rings on the bottom side. d. In a multi-axis transmission, it should be ensured that there are two retaining rings on every other pulley, or there should be a retaining ring on each opposite side around each pulley in the system.
A1.2 Pulley Installation Requirements
When installing the pulley, attention must be paid to the parallelism of the pulley axis, so that the transmission center surface of each pulley is in the same plane, to prevent the belt side from being pressed against the retaining ring due to the pulley deflection, causing the belt side to wear more severely, or even the belt to be cut by the retaining ring. Therefore, the pulley deflection must be adjusted. According to Figure A1, the deflection angle of 9㎡ can be adjusted to the allowable range (see Table A1). Figure A1
Belt width, mm
. 25. 4
26/1000
38.1 ~ 50 .8
When ensuring the alignment of the pulley, the rigidity of the transmission frame and the transmission should be ensured. A1.3When using the pulley, the rust on the pulley must be removed to avoid premature damage to the synchronous belt. A2 Synchronous belt
3/1000
A2.1 Tensioning of synchronous belt
The synchronous belt must have an appropriate tensioning force when installed. If the belt tensioning force is too small, it is easy to cause the belt teeth to be embedded in the tooth grooves of the pulley (tooth climbing) when starting frequently and there is impact load; if the belt tensioning force is too large, it is easy to reduce the belt life. The tensioning of the belt can be achieved by changing the center position of the transmission device. The appropriate degree of tension can be tested by adding a weight at the midpoint of the span between the two pulleys (see Figure A2). The size of the weight depends on the type, width and length of the belt, and can be calculated according to the following formula: Wuzhong: Wa
GB11361-89
Wd=(T++
×Y)716.
The weight required to produce the tension f at the point of tangent t, N initial tension, N (see Table A2):
The tension generated at the small point of tangent, f=0.016×t, mm; line length,
Y———correction amount (see Table A2):
a center distance, mm,
true diameter of the large pulley pitch circle, mm;
small pulley pitch circle diameter, mm1s
Belt length, mm.
Bandwidth, mm
Maximum assumed
Recommended value
Maximum optimal
Recommended value
19.6125.52
76.50/124.55174..57
87.28122.59
Band model
Bandwidth, mm
Maximum value
Recommended value
Maximum value
Recommended value
A2.2. Use of tensioning wheel
A2.2.1 Application occasions of tensioning wheel
GB11361—89
Continued Table A2
293.23420.72
221,64311.87
Tensioning wheel can be used in the following situations:
a. When the center distance cannot be adjusted, it is used as a method of belt tensioning. b. In a transmission with a larger speed ratio, it increases the wrap angle of the small pulley. A2.2.2 Installation method of tensioning wheel
2171.363883.57
7110,08
2479.213202.97
According to the purpose of tensioning wheel, there are two installation methods: Day. Installed on the inside for belt tensioning. The tensioning wheel should be a toothed pulley. When the number of teeth of the tensioning wheel is greater than the minimum number of teeth used by the pulley (see Table A3), in order to avoid reducing the number of meshing teeth, the tensioning wheel should be installed on the loose side (see Figure A3a). : Installed on the outside to increase the pulley wrap angle, see Figure A3 (b) The tensioning wheel can be a half pulley without a protrusion in the middle. Its diameter is the diameter of the pulley with the minimum number of teeth used, and it is installed on the loose side so that the belt will not bend excessively. Tension wheel
Tension
Small pulley speed n!
900~<1200
1200 ~<1800
1800~<3600
3 600 ~<4800
Additional instructions:
This standard is proposed by the Ministry of Machinery and Electronics Industry. GB 11361—89
Minimum number of teeth for pulleys
This standard is under the jurisdiction of the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Mechanical Standardization Research Institute, Shanghai Institute of Mechanical Engineering, and Textile Machinery Research Institute of China National Textile Machinery Corporation.97
According to the purpose of the tensioner, there are two installation methods: day. Installed on the inside for belt tensioning. The tensioner should use a toothed pulley. When the number of teeth of the tensioner is greater than the minimum number of teeth of the pulley (see Table A3), in order to avoid reducing the number of meshing teeth, the tensioner should be installed on the loose side (see Figure A3a). : Installed on the outside to increase the pulley wrap angle, see Figure A3 (b) The tensioner can use a half pulley without a protrusion in the middle. Its diameter is the diameter of the pulley with the minimum number of teeth, and it is installed on the loose side so that the belt will not bend excessively. Zhangju wheel
Tension Yan
Small pulley speed n!
900~<1200
1200 ~<1800
1800~<3600
3 600 ~<4800
Additional remarks:
This standard is proposed by the Ministry of Machinery and Electronics Industry. GB 11361—89
Minimum number of teeth for pulleys
This standard is under the jurisdiction of the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Mechanical Standardization Research Institute, Shanghai Institute of Machinery, and Textile Machinery Research Institute of China National Textile Machinery Corporation.97
According to the purpose of the tensioner, there are two installation methods: day. Installed on the inside for belt tensioning. The tensioner should use a toothed pulley. When the number of teeth of the tensioner is greater than the minimum number of teeth of the pulley (see Table A3), in order to avoid reducing the number of meshing teeth, the tensioner should be installed on the loose side (see Figure A3a). : Installed on the outside to increase the pulley wrap angle, see Figure A3 (b) The tensioner can use a half pulley without a protrusion in the middle. Its diameter is the diameter of the pulley with the minimum number of teeth, and it is installed on the loose side so that the belt will not bend excessively. Zhangju wheel
Tension Yan
Small pulley speed n!
900~<1200
1200 ~<1800
1800~<3600
3 600 ~<4800
Additional remarks:
This standard is proposed by the Ministry of Machinery and Electronics Industry. GB 11361—89
Minimum number of teeth for pulleys
This standard is under the jurisdiction of the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Mechanical Standardization Research Institute, Shanghai Institute of Machinery, and Textile Machinery Research Institute of China National Textile Machinery Corporation.
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