JB/T 8905.4-1999 This standard is part of the series of standards for reducers for cranes, which include: JB/T 8905.1 Three-point reducer for cranes JB/T 8905.2 Base reducer for cranes JB/T 8905.3 Vertical reducer for cranes JB/T 8905.4 Sheath reducer for barber heavy machinery This standard specifies the type, basic parameters, dimensions and technical requirements of sheath helical cylindrical gear reducers (QJ-T type) for cranes. The reducers of this standard are mainly suitable for the operating mechanism of cranes, and are also suitable for the transmission mechanism of mechanical equipment such as transportation, metallurgy, mining, chemical industry and light industry. The working conditions should meet the following requirements: a) The peripheral speed of the gear is not more than 16m/s; b) The speed of the high-speed shaft is not more than 1500r/min; c) The working environment temperature is -40℃～45℃; d) It can run in both forward and reverse directions. JB/T 8905.4-1999 Crane Kit Reducer JB/T8905.4-1999 Standard download decompression password: www.bzxz.net

JB/18905.41999
This standard is a part of the series of standards for reducers for cranes, which include IB/T 8905.1
JB/T 8905. 2 --1999
JB/T 8905. 3--1999
JB/T 8905. 4
Two-point reducers for cranes
Base-type reducers for cranes
Vertical reducers for cranes
Sheath-type reducers for cranes
Appendix A of this standard is the appendix of the standard. www.bzxz.net
This standard is proposed and managed by the National Technical Committee for Standardization of Hoisting Machinery, and the drafting unit of this standard is the Beijing Hoisting and Transportation Machinery Research Institute of the Ministry of Machinery Industry. Main drafters of this standard: Li Peng, Zhao Guangde 312
1 Scope
Machinery Industry Standard of the People's Republic of China
Set-type reducers for cranes
Hollow shaft gearhoxes far cranesJB/T 8905. 4
This standard specifies the type, basic parameters, dimensions and technical requirements of set-type helical cylindrical gear reducers (QJ-T type) for cranes. The reducers specified in this standard are mainly suitable for the operating mechanism of cranes and can also be used for the transmission mechanism of mechanical equipment in transportation, metallurgy, mining, chemical and light industry. Its working conditions shall meet the following requirements: a) The peripheral speed of the gear shall not exceed 16m/s; b) The speed of the high-speed shaft shall not exceed 1500r/min; c) The working environment temperature shall be -40 (-45 (:d) and it can run in both directions.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by being cited in this standard. When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards CB1911990 Pictorial marking for packaging, storage and transportation
GB/T 1031 1995
GB/T 1095
GB/T 1184--1996
GB/T 1356
G13/T 1357 --1987
GB/T 1801
GB/T 3811
GB/T 5903
GB/T 6404
G13/T 9439: -1988
GB/T 10095
G3/T 13384.-
JB/T 7929:1995
Surface roughness parameters and values
Flat keyKey and keyway cross-sectional dimensions
Shape and position tolerancesUnspecified tolerance values
Involute cylindrical gear
Basic tooth profile
Involute cylindrical gear module
Tolerances and matching dimensions to 500 mmTolerance zones and matchings for holes and shaftsCrane design specifications
1 Closed gear oils
Determination of sound power levels of gear unit noiseGrey cast iron parts
Involute Precision of open-line cylindrical gears
General technical conditions for packaging of electromechanical products
Cleanliness of gear transmission devices
JB/T9050.3-1999 Loading test method for cylindrical gear reducers
3 Types
3.1 Structural type: QI-T type reducer is a vertical sheathed reducer with stage transmission 3.2 There are four types of assembly types, see Figure 1. Approved by the State Bureau of Machinery Industry on June 28, 1999 and implemented on January 1, 2000
JB/T 8905. 4
Assembly type of reducer
3.3Shaft end type: High-speed shaft adopts cylindrical shaft extension. Flat key connection; low-speed shaft adopts hollow sleeve shaft, tapered shaft hole, flat key connection3.4Model and mark
Model representation method
Assembly type
Nominal transmission ratio
Nominal center distance
Set type
Crane reducer
Marking Example:
Nominal center distance iul-200mm, nominal transmission ratio i=10, assembly type starting from the first blood type Heavy machinery set reducer, marked as: reducer QJ-T200-40
JB/T8905.4--1999
4 Basic parameters and dimensions
4.1 Center distance
The reducer takes the output stage center distance as the nominal center distance, and its value should comply with the provisions of Table 1, Table 1
(Nominal center)
(Total center distance)
4.2 Transmission ratio
The nominal transmission ratio and actual transmission ratio of the reducer should comply with the provisions of Table 2. The limit deviation is not more than ±5. 14
Basic tooth profile of gear
JB/T8905.4-
The basic tooth profile of the reducer gear should comply with the provisions of GB/T1356. 4.4 Gear module and helix angle
The normal module m of the reducer gear shall comply with the provisions of GB/T1357, and its value is shown in Table 3. Gear helix angle 312\Table 3
4.5 Overall dimensions and installation dimensions
The overall dimensions and installation dimensions of QJ-T type reducer are shown in Figure 2 and Table 1, 31
JB/T 8905.4--. 1999
Figure 2 QJ-T type reducer
QJ-T140
QJ·T170
Q1 F200
QJ-1236
QJ-T280
QIT335
QI T400
QJ-T140
QJ-T170
QJ-T200
QJ-T236
QJ-T280
QJ-T335
QJ T400
280-200
335-236
280-200
4.6 Load-bearing capacity
JB/T8905.4-1999
4.6.1 The load-bearing capacity of the reducer with the working level of the mechanism being M5 shall comply with the provisions of Table 5. 65
100-130
4.6.2 The load-bearing capacity of the reducer of the continuous working type shall comply with the provisions of Table 6. This type of reducer is recommended for use in transmissions of various mechanical equipment other than cranes. 4.6.3 The instantaneous allowable torque at the output shaft end of the reducer is 2.7 times the rated torque. 4.6.4 The selection method of the set reducer for cranes is shown in Appendix A (Standard Appendix). 317
89°℃
Nominal center distance
Input shaft speed
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Nominal center service
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5 Technical Requirements
5.1 Box Body
JB/T8905.4
The box body is a cast iron part. Its mechanical properties shall comply with the specifications of HT200 in GB/T9.139. It is allowed to use other materials with mechanical properties higher than HT200, or use welded box body: 5.1.2 The lower box body and the left and right boxes shall not have casting defects such as slag inclusions, shrinkage holes, looseness, holes and cracks. 5.1.3 The lower box body and the left and right boxes shall be treated to eliminate internal stress, and secondary aging treatment shall be carried out after rough machining. 5.1.4 After the lower case is combined with the left and right cases, the edges should be flush. The misalignment of each side should meet the requirements of the specification. 5.1.5 The surface roughness R of the separation and combination surface after fine machining is 6.3 mm. 5.1.6 After the lower case is freely combined with the left and right cases, the contact tightness should meet the requirements of Table 7. Use the corresponding feeler gauge to check the contact tightness of the separation and combination. The depth of the feeler gauge should not be greater than half of the width of the separation and combination surface. Table 7
Allowable misalignment of the chain edge after the case is combined
Contact tightness of the lower case after the left and right cases are freely combined. 600
5.1.7 The center line of the bearing hole should coincide with the separation and combination surface, and the deviation should not be greater than 0.3 mm600-1 20
5.1.8 The size tolerance zone, shape and position tolerance and surface roughness of the bearing hole shall comply with the provisions of Table 8 Table 8
Bearing hole
Dimensional tolerance zone
GB/T1801
Cylindricity
Coaxiality
Verticality between end face and axis
GB/T1184
The center distance limit deviation of the bearing hole shall comply with the provisions of Table 9 Table 9
Center distance
~50~80
-80 - 120
≥120180
180- 250
The parallelism tolerance of the center line of the bearing hole and the factory measured on the bearing span shall comply with the provisions of Table 10 Table 10
Bearing span 1a
Bank of China Three-person
5.2 Gears, gear shafts and shafts
10n- 160
2160-230
Table roughness code
GR/T 1031
2230 100
5.2.1 The gear shaft is forged. The material is 12CrMo), quenched and tempered, with a hardness of 291~323H3. Other materials with similar or higher mechanical properties are allowed: Castings are not allowed: 322
JB/T8905.4
5.2.2 The gear is forged. The material is 35CrMo. Quenched and tempered, with a hardness of 255~291HB. Other materials with similar or higher mechanical properties are allowed.
5.2.3 The teeth must be inspected, and defects such as white spots, cracks, and slag inclusions are not allowed. 5.2.4 The material of the shaft is 40 (r, quenched and tempered, with a hardness of 241-~286HB. Other materials with equivalent or higher mechanical properties are allowed. Castings are not allowed.
5.2.5 The machining dimension tolerance zone, position tolerance and surface roughness of the gear reference hole and reference end face shall comply with the provisions of Table 11Table 11
Gear reference hole
Gear reference end face
Dimension tolerance zone
GB/T 1801
End face runout
G3/T 118.
Surface roughness
The reference journal and shoulder machining tolerance zone, position tolerance and surface roughness of gear shafts, shafts and bearings shall comply with the provisions of Table 125.2.6
.
Reference shaft
Provisions.
Dimension tolerance zone
GB/T 1801
Radial runout
GB/T 184
End runout
Precision
The shaft extension true diameter, shaft extension shoulder machining tolerance zone, position tolerance and surface roughness of gear shafts and shafts shall comply with Table 13
Shaft extension diameter
Shaft extension shoulder
Dimension tolerance zone
GB/T: 1801
Radial runout
GB/T 1184
The fit between the gear shaft and the shaft and the inner hole of the gear shall comply with the provisions of Table 11Table 14
Gear shaft and shaft
Gear inner hole
5.2.9The size tolerance zone, position tolerance and surface roughness of the keyway shall comply with the provisions of Table 15. Table 15
Keyway width tolerance zone
GB/T 1095
Hub Js9
Symmetry of keyway width relative to the axis centerline
GB/T 1184
GB/T 1801
Roughness
Surface roughness R
GB/T 1031
Side 6
According to wine 2,
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