This standard specifies the product classification, basic parameters and technical requirements of NLQ type planetary gear reducer. This standard is applicable to chemical industry, large and medium-sized glass fiber reinforced plastic cooling tower, circular countercurrent tower, square crossflow tower and other similar mechanical transmission. The speed of the reducer high-speed shaft is 750, 1000, 1500r/min. The working environment temperature of the reducer is -40~45℃. The reducer can run in both forward and reverse directions. JB/T 7345-1994 NLQ type planetary gear reducer JB/T7345-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7345-94
NLQ type planetary gear reducer
1994-07-18 Issued
Ministry of Machinery Industry of the People's Republic of China
1995-07-01 Implementation
Mechanical Industry Standard of the People's Republic of China
NLQ type planetary gear reducer
Subject content and scope of application
JB/T 7345-94
This standard specifies the product classification, basic parameters and technical requirements of NLQ type planetary gear reducer (hereinafter referred to as reducer). This standard is applicable to chemical industry, large and medium-sized glass fiber reinforced plastic cold tower, shaped flow tower, square cross flow tower and other similar mechanical transmissions. The speed of the high-speed shaft of the reducer is 750.1000.1500r/min; the working environment temperature of the reducer is -40~+45℃: the reducer can run in both forward and reverse directions. ] ||JB/ZQ4000.9
JB/ZQ4286
ZBJ19 005
3 Types and dimensions
Packaging and distribution pictorial symbols
Sectional dimensions of flat keys, chains and keyways
Basic tooth profile of involute cylindrical gears
Module of involute cylindrical gears
Tapered shaft extension
Glass fiber reinforced plastic cooling tower
Precision of involute cylindrical gears
Cleanliness of gear transmission devices
NGW planetary gear reducer
General technical requirements for product inspection
General technical requirements for assembly
General technical requirements for packaging
Test methods for cylindrical gear reducers
The overall dimensions and assembly types of reducers are specified in Figure 1, Figure 2, Table 1 and Table 2. 3.1
3.2 Reducer code and marking method
The reducer code includes: model, specification, motor power, reducer output shaft speed, and standard number. Reducer marking method
Standard number
Reducer output speed, r/min
Rated power of motor
Special planetary gear reducer for cooling tower
Approved by the Ministry of Machinery Industry on 199407-18
19950701 Implementation system
3.3 Marking example
JB/F7345
IB/T 7345-
Standard number
Reducer output speed is 125r/min
Rated power of motor is 5.5kW
Specification is 160
NGW type planetary gear reducer for cooling tower
JB/T 7345 -94
NLQ132
NLQ160
NLQ180
NLQ200
NLQ225
NLQ250
NLQ280
Basic parameters
140100
JB/T 7345--94
The nominal transmission ratio and actual transmission ratio of the reducer shall comply with the provisions of Table 3. Table 3
Jinjin Transmission Energy
—Year 19
4—$19
4—$22
4—$22
The relative error between the actual transmission ratio and the nominal transmission ratio of the reducer shall not exceed 2%~5%. 4.2 The gear module shall comply with the provisions of GB1357. The gear module selected in this standard is shown in Table 4. Table 4
4.3 The basic gear of the reducer gear shall comply with the provisions of GB1356. 4.4 The number of planetary gears n,=3.
The tooth width coefficient of the reducer gear
The tooth width coefficient of the planetary gear 4=0.5～0.55; tooth width b=a (a is the center distance). Technical requirements
5.1 Technical requirements for main parts
5.1.1 Body and cover
JB/T 7345 94
The material of the body and cover shall not be lower than the requirements of HT200～250 specified in GB5675. The body and cover shall be subjected to aging treatment after rough machining.
5.1.2 The body and cover are not allowed to seep or condense. 5.1.3 Planet carrier
The planet carrier adopts QT600-3, and it is allowed to use materials with equivalent mechanical properties. Its mechanical properties shall not be lower than the specified values ​​of GB1348, and the heat treatment hardness is 217~255HB.
5.1.4 The limit deviation of center distance a shall comply with the specified values ​​in Table 5. Table 5
Center distance a
Gear, gear shaft, shaft
>50~80
>8n~120
>120~180
The sun gear, measuring wheel, internal gear, gear shaft, and floating gear sleeve adopt forgings, and the materials, heat treatment and mechanical properties shall comply with Table 6. It is allowed to use materials with mechanical properties not lower than it. Gear carburizing rust, rust and grinding cracks are not allowed on the tooth surface. Table 6
Sectional dimensions
20CrMnMo
20CrMnTi
42CrMo
Heat treatment
Carburizing rate
Fire and tempering
~800
Mechanical properties
After finishing the tooth surface, the effective hardened layer depth shall comply with the provisions of Table 7. 5.1.6
Effective hardened layer depth
262293
217~255
GB307788
The size tolerance zone, shape and position tolerance and surface roughness of the gear reference hole and reference end face shall comply with the provisions of Table 8. Table 8
Gear reference hole
Gear reference reduction surface
Dimension tolerance zone 1
GB1801
H7/K7P7
Note: 1) It is the matching tolerance zone between the inner hole of the planetary gear and the bearing. Shape and position tolerance
GB1184
Diameter
Western runout
5.1.8 The diameter deviation of the sun gear, planetary gear, internal gear, gear shaft, floating internal and external gears shall be selected according to Table 9. Surface axiality
GB1031
Pitch function diameter
Item reading diameter deviation
Note+1) Internal gears use "+" and external gears use "_"5.1.9www.bzxz.net
Gear accuracy shall comply with the provisions of GB10095:JB/T7345
>80~120
Sun gear, planetary gear, gear shaft: accuracy 7-6-6 level. Internal gear: accuracy 8-7-7 level.
Floating external gear is 8-7-7 level.
>120180
Tooth working surface roughness accuracy 7 and 8 are both R≤3.2um>18G~250
>256~315
The combination of gear inspection items shall comply with the provisions of Table 10. Other equivalent inspection item groups are allowed. Table 10
Inspection group
Accuracy grade
First tolerance group\
F, (Fa)
Note: 1》F, and F. are only used for process control, not as acceptance basis. First tolerance group
First tolerance group
>315~400
Gear pair
Contact point
5.1.11 Gear radial runout tolerance F.. Normal length variation tolerance F., tooth shape tolerance fr, pitch limit deviation t, base pitch limit deviation f shall comply with the provisions of Table 11.
Division Diameter
≤125
>125~400
Normal Module
≥1~3. 5
>3.5~6. 3
>3. 5~6.3
678678
The cumulative tolerance F of the tooth pitch and the cumulative tolerance F of the individual tooth pitch shall comply with the provisions of Table 12. Table 12
Division Arc Length
Accuracy Grade
>20～32
>32~50
Note: When checking F, take Lx
minus m/eosp (an integer of k/2).
5.1.[3 Tooth tolerance F shall comply with the provisions of Table 13. 6
>50~80
>80~160
>160~315
>315~630
Gear width
Fine leather grade
Accuracy grade
Accuracy grade
JB/T734S-:94
>40~100
>100~166
>164) 230
Sun gear tooth thickness limit deviation E., E..Normal average length limit deviation E.., Em shall comply with the provisions of Table 14. Table 14
Pitch circle
>i25~400
Normal module
>3. 5 ~ 6. 3
Tooth thickness limit deviation
Card deviation code
Reporting limit deviation
Normal line average length limit deviation
Card deviation code
Three general extreme deviations
Planetary gear tooth thickness limit deviations E, E, normal line average length limit deviations Ewa, Ewa shall comply with the provisions of Table 15. Table 15
Graduation circle
>125~400
Normal module
>3. 5 ~6. 3
≥1~3. 5
>3. 5~6. 3
Tooth thickness limit deviation
Card deviation code
Card limit deviation
Normal average length limit deviation
Card base code
Upper limit deviation
—201
5.1.16 The tooth thickness limit deviation Eu, E of internal gears. The normal average length limit deviation Ewe, Ewni and the base column measurement distance limit deviation E, E (the measurement method is shown in Figures 3 and 4) shall comply with the provisions of Tables 16 and 17. 7
Accuracy grade
Accuracy grade
Division limit
≥125~400
Division diameter
>125~400
Normal modulus
>3. 5 ~6. 3
Normal modulus
≥1~3. 5
JB/T7345
Tooth thickness limit deviation
Lu limit deviation
Ka code
Ka code code
Normal average length limit deviation
Diamond code
Measuring column measuring distance limit deviation
Limit deviation
Limit deviation
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