This standard specifies the type, tooth size and limit deviation, pulley size and limit deviation, shape and position tolerance and marking of pulleys in circular arc tooth synchronous belt transmission. This standard is applicable to pulleys in circular arc synchronous belt transmission for general industrial use. JB/T 7512.2-1994 Circular Arc Tooth Synchronous Belt Transmission Pulley JB/T7512.2-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Circular arc tooth synchronous belt transmission
1 Subject content and scope of application
JB/T 7512.2—94
This standard specifies the type, gear tooth size and limit deviation, gear wheel size and limit deviation, shape and position tolerance and marking of the belt wheel in the circular arc tooth synchronous belt transmission.
This standard applies to the belt wheel in the circular arc tooth synchronous belt transmission for general industrial use. 2
Referenced standards
GB11357 Pulley material, surface roughness and balance 3 Pulley groove type and gear tooth size
The belt wheel groove type is 3M, 5M, 8M, 14M and 20M. 3.1 Shape and size of gear teeth
The gear tooth shape, basic size and limit deviation of the belt wheel of the circular arc tooth synchronous belt transmission are shown in Figure 1 and Table 1. Figure 1
3.2 Pitch deviation value
Tooth groove depth
Arc tooth synchronous pulley tooth
Tooth planting circle radius Tooth top fillet radius
0. 26--0. 35
1.36~~1.50
1.95~2.25
The pitch deviation between adjacent teeth of the pulley and the cumulative deviation within a 90° arc are shown in Table 2. Approved by the Ministry of Machinery Industry of the People's Republic of China on October 25, 19947.448
Tooth width
Two times the pitch distance
Tooth angle
Implementation on October 1, 1995
Pulley outer diameter
>25. 40～50. 08
>50. 08~101. 60
>101.60~~177.80
>177. 80 ～304. 80
>304. 80~508. 00
Pulley size and limit deviation
Pulley width
The width dimension of the pulley is shown in Figure 2 and Table 3.
Wheel width code
JB/T 7512.2—94
Table 2 Pitch deviation
Pitch deviation
Any two adjacent teeth
Table 3 Pulley width dimensions
90° internal accumulation
Wheel width code
4.2 Pulley diameter
4.2.1 Number of teeth, pitch diameter and outer diameter of pulley
JB/T 7512.2—94
Continued Table 3
The number of teeth, pitch diameter and outer diameter of the pulley are shown in Figure 3 and Tables 4-1 to 4-5.8M
Pulley width
Pitch diameter outer diameter
Table 4-1
Pitch line
Pitch circle
3MBasic dimensions of pulleys
JB/T 7512.2—94
Continued Table 4-1
JB/T 7512.2-94
5MBasic dimensions of pulleys
Table 4-2
144183
123195. 76
126 200. 54
132/210.08
1561 248.28 1 247.14
JB/T 7512. 2---94
8M Basic dimensions of pulleyswwW.bzxz.Net
Table 4-3
314139
JB/T 7512.2—94
Table 4-4
14M Basic dimensions of pulleys
561,50
614，
915,21
JB/T 7512.2--94
Table 4-5
Basic dimensions of 20M pulley
146929.46
158/1 005. 86/1
1 228. 681 224. 36
235. 04 1 230.72
1961247.77
1 266. 871 262. 56
1273.24/1
065.20205
1071.57206
1 082.251
077.941207
094. 991 090. 67l 209
311.441 307.12
343. 271 335.95
349.631 345.33
356. 001 351. 68
1 362. 37/1 358. 05
368.731 364.41
375.101 370.79
4.2.2 Limit deviation of pulley outer diameter
The limit deviation of pulley outer diameter is shown in Table 5.
Outer diameter d.
Limit deviation
4.3Minimum number of teeth of pulley
>25. 4~50. 8
The minimum number of teeth Zmin of pulley is shown in Table 6.
Pulley speed
>900~~1 200
>1 200~～1 800
>1 800-~3 600
>3 600~4 800
4.4Pulley retaining ring size
Pulley retaining ring size is shown in Figure 4 and Table 7.
JB/T 7512. 2—94
Table 5 Limit deviation of pulley outer diameter
6>101. 6~177.8≥177. 8~304. 8≥304. 8~508. 0>50.8~101.6
Table 6 Minimum number of teeth of pulley
8°~~25°
Acute angle chamfer
d Outer diameter of pulley, mmdw-diameter of bend of retaining ring, mm+dw=da+2Rd-outer diameter of retaining ring, mmd=dw+2K
D-diameter of matching hole between retaining ring and pulley, mm
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