JB/T 7512.3-1994 Design method of circular arc tooth synchronous belt transmission
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Circular arc tooth synchronous belt transmission
Subject content and applicable range
Design method
JB/T 7512.3-94
This standard specifies the design method of circular arc tooth synchronous belt transmission, and is applicable to the design of five types of circular arc tooth synchronous belt transmission, namely 3M, 5M, 8M, 14M and 20M, as specified in JB/T7512.1-94 "Circular arc tooth synchronous belt transmission belt" and JB/T7512.2-94 "Circular arc tooth synchronous belt transmission pulley".
2 Reference standards
GB6931.3 Synchronous belt drive terms
Circular arc tooth synchronous belt drive
JB/T 7512.1
JB/T7512.2 Circular arc tooth synchronous belt drive
3 Terms and codes
3.1 The terms in this standard shall be in accordance with the provisions of GB6931.3. 3.2 The codes used in the design method of this standard are shown in Table 1. Code, name and unit
Name and meaning
Nominal power to be transmitted
Design power
Working condition coefficient
Small pulley speed
Large pulley speed
Transmission ratio i=n/n2+Small pulley is the driving pulley
Increase ratio, R=n1/n2: Small pulley is the driven pulleyMinimum number of pulley teeth
Number of teeth of small pulley
Number of teeth of large pulley
Pitch diameter of small pulley
Pitch diameter of large pulley
Small pulley Outer diameter
Outer diameter of large pulley
Preliminary center distance
Preliminary pitch length of belt
Approved by the Ministry of Machinery Industry of the People's Republic of China on October 25, 1994 460
Implemented on October 1, 1995
Original design data
Type of prime mover and working machine;
Daily operation time;
Nominal power P to be transmitted;
4.4Small pulley speed nl;
5Large pulley speed nz
Preliminary center distance aoi
Special requirements for transmission space.
Design steps
Determine the design power Pa
Where: Ka
JB/T 7512. 3--94
Continued Table 1
Name and meaning
Belt pitch length
Actual transmission center distance
Center distance installation amount
Center distance adjustment amount
Minimum bandwidth Basic rated power
Band width coefficient
Belt length coefficient
Meshing teeth number coefficient
Meshing teeth number
Rated power| |tt||Basic belt width
Pulley width with retaining ring
Pulley width without retaining ring
Tight side tension of belt
Loose side tension of belt
Axial compression force
Wrap angle of belt on small pulley
Correction coefficient for adding loss
Deflection, deflection installation force that should be ensured at the middle point of the straight edge during installation, installation force applied at the middle point of the straight edge during installation P&= KaP
Working condition coefficient, see Table 2.
Working machine
JB/T 7512. 3-94
Working condition coefficient KA
Prime mover
AC motor (normal torque squirrel cage
DC motor (large torque, large slip
type, synchronous motor), DC motor (high power, single phase, slip ring), DC motor (compound (parallel excitation), multi-cylinder internal combustion engine
Operation time
Intermittent use
Copier, oil distribution device, measuring instrument, projector, medical equipment
Sweeper, sewing machine, office machinery
Belt conveyor, light packaging machine, drying box, screening machine, winding machine, cone forming machine woodworking lathe, saw liquid mixer, dough mixer, drilling machine, punching machine, lathe, thread processing machine, seaming machine, circular sawing machine, gantry planer, washing machine, papermaking machine, printing machine
Semi-liquid mixer, belt type Conveyor (ore, coal, sand), shaft, grinder, shaper, boring machine, milling machine, centrifugal pump, gear pump, rotary feed system, cam vibrating screen, textile machinery (warping machine), centrifugal compression pump brick making machine (except mud mixer), conveyor (flat plate, disc type), bucket elevator, elevator, dehydrator, cleaning machine, centrifugal exhaust fan, centrifugal blower, suction fan, generator, exciter, crane, heavy lift, rubber machinery, sawmill, textile machinery
centrifuge, scraper conveyor, screw conveyor, hammer mill·paper pulping machine
clay mixer, mining fan, blower, forced air fan
reciprocating compressor, ball mill, rod mill, reciprocating pump1.0
Note: ① For speed-increasing transmission, the following figures must be added to KA in this table: R==11. 24
R-1. 75~2. 49
Ordinary use
8~10 h
R=1.25~1.74
R2.50-3. 49
excitation, series excitation), single-cylinder internal combustion engine
operating time
continuous use intermittent use ordinary use continuous use daily
16~24h
1 8~10 h
②For transmission with belt type of 14M and 20M, when ni≤600r/min, the additional coefficient (added to KA) shall be as follows: n ≤200 r/min,0. 3, ni =201~-400 r/min,0.2; n =401--600 1/min,0.1.③ For abnormal transmission such as frequent forward and reverse rotation, severe impact, emergency shutdown, etc., the working condition coefficient needs to be corrected according to the specific situation. 462
116--24 h
5.2 Select belt type
Press and P to select the belt type according to Figure 1.
3500r/min
1750r/min
1160r/min
870r/min
0.20.30.40.60.81
5.3 Calculate the transmission ratio
5.4 Determine the pulley diameter
5.4.1 Determine the number of pulley teeth Z1, Z2
JB/T 7512.3-94
Selection diagram
i= ni/n2
The number of teeth of the small pulley is determined according to the principle of Z1=2mi, and the number of teeth of the large pulley is shown in Table 3. The number of teeth of the large pulley is recorded as one, and rounded after calculation. 5.4.2 Determine the pulley diameter
20 30 40 60 80 100
200 300 400 600 800 1000
Design power, kw
center China center
Pulley pitch circle diameter d1d. And the pulley outer diameter dald is obtained from Table 4 in JB/T7512.2, according to the corresponding number of teeth 21Z. The minimum number of teeth Zmin in Table 3 is obtained
Pulley speed
>900~1 200
>1 200-~1 800
>1 800~3 600
>3 600~4 800
JB/T 7512.3—94
5.5 Select the pitch line length L of the belt, and determine the actual center distance α5.5.1 Calculate the initial pitch line length Lo of the belt
(dz di>2
L.= 2a.+1. 57(d2 +di) +
Where; a. -
-Initial center distance, mm, given by the design task. 5.5.2 Select the standard pitch line length L
L of the belt according to L. Select from Table 4 to Table 8 in JB/T7512.1. 5.5.3 Determine the actual center distance 4
The approximate calculation formula for the center distance is:
a=[M + VM2 - 32(d, - d.)°}/16M = 4L, - 6. 28(dz + d1)
The precise calculation formula for the center distance is shown in GB11362 formula (5) and formula (6). 5.6 Determine the center distance adjustment lower limit 1 and adjustment upper limit S The center distance range is: a1) (a +) mm. The I and S values are shown in Table 4. mm
Table 4 Center distance installation amount I and adjustment amount S
>500-1 000
1 000~1 500.
1 500~2 260
>2 2603 020
3 020~4 020
74 020~4 780
>4 780~6 860
1, 02
Note: When the pulley is added with the retaining ring, the installation amount I should also add the following values (mm): Belt type
5.7 Determine the belt length coefficient Kl
The belt length coefficient K can be found in Table 5.
≤1400
Single wheel with retaining ring
Retaining rings on both wheels
Table 5 Belt length coefficient K,
191260
441~550
601~900
1 4011 700
2 001～~2 500
261~400
551~800
901~1 250
1 7012 000
2 501~3 400
401--600
801～1 100
1251~1800
2 001～2 500
3 401~-4 600
2 501-3 400
4 601-~5 600
（3）
-（5）
5.8 Determine the meshing tooth number coefficient K2
The meshing tooth number Zm is calculated by formula (6):
The meshing tooth number coefficient Kz is determined by formula (7): Zm
JB/T 7512.3—94
Zm≥ 6,Kz = 1
Zm < 6,K2 - 1 -- 0. 2(6 - Zm)5.9 Determine the basic rated power P of the belt
The minimum width of each belt type is recommended to use the basic rated power P. , see Tables 7 to 11. 5.10 Rated power of belt P
The rated power of belt is calculated according to formula (8):
P, -- K,K2KwP.
Where Kw
Band width coefficient.
5.11 Determine the width of belt and pulley
Select the belt width b. according to the principle of Pa≤P., then bs
b.zb.o NKiKiP.
Where b. See Table 6.
（7）
( 10 ）
According to the calculation result, select the standard push bandwidth b corresponding to the calculation result from Table 2 of JB/T7512.1:, and determine the pulley width b or b from Table 3 of JB/T7512.2.
Table 6 Basic width of belt bao
5.12 Calculation of axial compression force Q
The schematic diagram of axial compression force Q is shown in Figure 2.
Figure 2 axial compression force of belt drive
The tight side tension F, and the loose side tension F2 of the belt are calculated by formula (11) and formula (12) respectively: F, = 1 250 Pa/u
Fz 250Pa/v
Where: -
-belt speed, m/s+=tdin/6 000.
( 12 )
The compression force Q is calculated by formula (13):
When the operating coefficient KA≥1.3:
JB/T 7512.3—94
Q= KF(F + F,)
Q = 0. 77KF(F1 + F2)
Wherein; K——vector addition correction coefficient, see Figure 3. 1.0
Small pulley wrap angle, a\
Figure 3 Vector addition correction coefficient
K is obtained according to the small pulley wrap angle α by referring to Figure 3. The small pulley wrap angle is calculated by formula (15): d - di × 57. 3°
180°
5.13 Belt tension
Calculate the deflection f (see Figure 4) that should be ensured when installing the belt according to formula (16) and formula (17) so that the belt has appropriate tension. t
ft/64
Figure 4 Belt tension when installing
Apply the installation force G specified in Table 12 (see Figure 4), and adjust the center distance so that the deflection f is consistent with the calculated value. 466
..**(14)
（15）
（16）
（17）
0. 00310. 003
JB/T 7512. 3-94
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00210. 003
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0. 01310. 01
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