Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7684-95
LAK Saddle Block Flexible Coupling
Published on 1995-06-16
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1996-07-01
Mechanical Industry Standard of the People's Republic of China
LAK Saddle Block Flexible Coupling
Subject Content and Scope of Application
JB/T7684-95
This standard specifies the type, size, basic parameters, technical requirements, inspection rules, etc. of LAK saddle block flexible coupling (referred to as coupling).
This standard is applicable to the transmission shaft system connecting two coaxial lines. It has certain radial, axial, angular compensation and shock absorption performance. The ambient temperature is -20～+80℃. The nominal torque transmitted is 63～50000N·m. 2 Reference standards
GB3507
GB3852
GB4879
GB12458
JB/ZQ4000.2
JB/ZQ4000.5
JB/ZQ4000.7
JB/ZQ4000.9
Nominal torque series of mechanical couplings
Type and size of coupling shaft hole and keyway
Rust-proof packaging
Classification of mechanical couplings
General technical requirements for cutting parts
General technical requirements for castings|| tt||General technical requirements for forgings
General technical requirements for assembly
Type, basic parameters and main dimensions
The type, dimensions and basic parameters of the coupling shall comply with the provisions of Figure 1 and Table 1. Y-type shaft hole
Y-type shaft hole
Figure 1LAK shielding block elastic coupling
Approved by the Ministry of Machinery Industry on June 16, 1995
Z. type shaft hole
Implementation on July 1, 1996
Nominal torque
Permissible speed
Shaft hole diameter d, d,
20,22,24
3 0.32.35.38bzxZ.net
30,32,35,38
40,42,45
30,32,35,38
40,42,45,48
40,42,45,48,50,
42,45,48;50,55,56|| tt||60.63.65,70,71
45,48-50,55,56
60,63,65,70,71.75
50,55,56
60,63,65,70.71 ,75
50+55+56
60,63.65,70;71.75
60.63,65,70.71,75
80.85,90,95
60,63.65,70,71,75
80.85.90.95
65.70.71.75
:80.85.90.95
100.110.120
JB/T7684-95
Shaft hole length
Slow rotation
kg ·m
Nominal speed range
Permissible speed
Shaft hole diameter dd,
80,85.90,95
100,110,120,125
85,90,95
100,110,120,125
130.140,150
100.110.120.125
130.140,150
160.170 ,180
110,120,125
130,140,150
160.170.180
120,125
130.140,150
160,170.180
190.200.220
Note: ①The weights listed in the table are the maximum weights of the couplings, ②The rotational feed is an approximate value
③Z1-type shaft holes cannot be used at both ends of the coupling. ()The maximum torque of the coupling is three times the nominal torque. 3.2The allowable compensation of the coupling is shown in Table 2. 3.3Model and mark
JB/T 7684-95
Continued Table 1
Shaft nipple length
Coupling specification code
Drum block elastic coupling
3.4 Marking example
Example 1: LAK11 saddle block elastic coupling
Driving end: Y-type shaft hole. A-type keyway. d=75mm. L142mmDriven end: J1-type shaft hole, B-type chain groove, d=75mm, L=107mmLAK11 coupling:
75X142
J1B75X107
Example 2: LAK7 saddle block elastic coupling
JB/T7684
Moment of inertia
JB/T76 84--95
Driving end: Z1 type shaft hole. C type keyway. d=55mm.L=84mmDriven end: J1 type shaft hole, A type keyway. d=65mm, L=107mmLAK7 coupling
Allowable compensation
4 Technical requirements
Z1C55×84
J1A65X107
JB/T7684
Allowable compensation
The coupling shall comply with the provisions of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.1
4.2 General requirements
4.2.1 The material of the half coupling is ZG310-570 or 45# forged steel. mm
4.2.2 The castings and forgings of the coupling shall meet the requirements of JB/ZQ4000.5 and JB/ZQ4000.7 respectively; the machined parts shall meet the requirements of JB/ZQ4000.2.
4.3 The physical and mechanical properties of the rubber elastic parts of the coupling shall meet the requirements of Table 3. Table 3
Degrees Celsius
Elongation at break
Tensile strength
Water deformation after break
Hot air aging
100C×70h
Change rate of hardness
Change rate of elongation at break
Change rate of tensile strength
Volume change rate No. 3 engine oil
100C×70h h
Test method
GB527 "General requirements for physical test methods for repellent rubber3
GB5286 Determination of tensile properties of repellent rubber GB1690 "Test method for resistance to reduction of repellent rubber" VI:
The bonding strength between elastic rubber parts and metals and braids shall not be lower than the standard in Table 4
Between repellent rubber and metal chips
Between repellent rubber and braids
Between composite materials
The pre-tightening torque of bolts during assembly shall be in accordance with the provisions of Table 5. Bolt specifications
Pre-tightening torque N·m
5 Inspection rules
JB/T7684-95
Test method
HG 4-854 (Determination of the bonding strength between chemical rubber and metal agent GB532 "Determination of the bonding strength between chemical rubber and fabric 2M10
5.1 The quality inspection department of the coupling manufacturer shall inspect and accept the drawings and technical documents that meet the requirements of this standard and are approved through the prescribed procedures, and provide the product factory certificate. 5.2 Type inspection is only used when new products are put into production or the formula of elastic parts is changed or the process is changed. The inspection items are determined by negotiation between the supply and demand parties.
6 Marking, packaging, purchase and storage
The marking content is as follows:
Manufacturer name:
Product name and model:
Product mark;
Inspection pass mark:
Manufacture date.
6.2 Packaging
After cleaning, the coupling shall be rust-proof packaged according to the provisions of GB4879, 6.3 Storage
The coupling should be stored in a dry, ventilated place away from sunlight and rain. Avoid contact with acids, alkalis, oils and organic solvents during the storage period.
JB/T7684-95
Appendix A
Instructions for the selection of couplings
(reference)
The coupling is selected based on comprehensive factors such as load conditions, operating speed, ambient temperature, calculated torque and shaft hole size. The calculated torque can be obtained by formula (A1):
TK,KK,T=K,K,K,×9550≤T
Wherein: T,-calculated torque N·m
theoretical torque.N·mt
nominal torque, N·m:
driving power.kW:
working speed, r/min:
K,—operating condition coefficient, see Table A1:
K,—prime mover coefficient, see Table A2
K, temperature coefficient, see Table A3.
Working load conditions
Working condition coefficient K,
Internal combustion engine
Overflow coefficient K,
Additional instructions:
Uniform hook load
Electric motor, steam turbine, steam engine
Water turbine, turbine
More than 4 cylinders
20~+30
>+30~+40
Variation and medium impact load
+40~+50
>+50~+60
This standard was proposed and managed by Xi'an Heavy Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shenyang Heavy Machinery Plant. The main drafters of this standard were Ma Chunling and Zhao Zhong. 6
Change and big impact Dunhe
Source motivation coefficient K:
+60~+70
>+70+80
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