GB/T 37400.18-2023
General technical conditions for heavy machinery Part 18: Open gear transmission system (English Version)
- Standard No.
- GB/T 37400.18-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 37400.18-2023
- Introduction
GB/T 37400.18—2023 Standard Overview
GB/T 37400.18—2023 "General Technical Requirements for Heavy Machinery Part 18: Open Gear Transmission System" is mainly applicable to low-speed heavy-load involute open gear transmission systems used on cylindrical rotary equipment (such as ball mills, rod mills, autogenous mills, semi-autogenous mills, rotary kilns, coolers, dryers and cylindrical mixers, etc.). The standard clarifies the type classification, technical requirements, test methods, inspection, marking, packaging, transportation and storage of open gear transmission systems, providing an important basis for the design, manufacturing, inspection and acceptance of related fields.
Types and classification of open gear transmission systems
Classification dimensions Specific classification Tooth line shape Open spur gear, open helical gear Large gear structure Two-petal, four-petal, six-petal structure Large gear installation method Flange installation method, spring plate installation method
Technical requirements and specifications
5.1 Basic requirements
Open gear transmission systems shall meet the following basic conditions:
- Ambient temperature range: -5℃~40℃;
- Pitch circle linear speed range: 0.3m/s~10.2m/s or pinion speed range: 1r/min~450r/min;
- The end face overlap of spur gears shall not be less than 1, and the axial overlap of helical gears shall not be less than 1.
Material requirements
Pinion gears should be forged (recommended grades: 42CrMo, 40CrMnMo, 37SiMn2MoV, etc.), Gear gears should be cast steel or ductile iron (recommended grades: ZG35CrMo, QT600-3, etc.). The heat treatment hardness of the materials needs to match, and the hardness of the pinion gear should be at least 40HBW higher than that of the gear gear.
Lubrication and Sealing
5.4 Lubrication
The lubrication methods of open gear transmission systems include continuous lubrication and intermittent jet lubrication. The recommended lubricant viscosity and flow rate should be selected according to parameters such as ambient temperature and pitch circle linear speed. Please refer to Table 7, Table 8 and Table 9 for details.
Key data: The lubricant flow rate is proportional to the pitch circle diameter and tooth width of the large gear, and the flow rate range is between 2.4ml/20min and 59.79ml/20min.5.5 Sealing
Open gears should be equipped with semi-enclosed gear dust covers, which should be circular or polygonal in shape. Sealing is achieved through the sealing ring on the end face of the large gear rim and the mating parts on the dust cover.
Installation and commissioning
5.6.1 Installation requirements
Before installing the large gear, ensure that the tooth surface and the mating surface are free of burrs and bumps. The large gear with a split design should be marked with matching. During assembly, the radial runout tolerance and the end face runout tolerance must meet the requirements of Table 2 and Table 3.
5.6.2 Commissioning requirements
During the commissioning process, check:
- The preload of the bolts connecting the large gear flange and the cylinder flange;
- The small gear and its bearing run without abnormal sounds;
- The lubrication system runs well;
- There is no oil leakage from the dust cover.
Standard Implementation Recommendations
To ensure the effective implementation of GB/T 37400.18-2023, it is recommended that:
- Manufacturing companies should establish a sound quality management system and strictly select and heat treat materials in accordance with standard requirements;
- Fully consider the stress conditions and working environment of the gears during the design phase, and optimize the gear structure and installation method;
- Strengthen the design and maintenance of the lubrication system to ensure that the lubricant flow and viscosity meet the requirements;
- Regularly check the meshing accuracy, contact spots and normal backlash of the open gear transmission system.
GB/T 37400.18-2023 Referenced Document
- GB/T 10095.1 Cylindrical gears—ISO system of flank tolerance classification—Part 1:Definitions and allowable values of deviations relevant to flanks of gear teeth
- GB/T 10095.2 ISO tooth surface tolerance classification system for cylindrical gears - Part 2: Definition and allowable values of comprehensive radial deviation*， 2023-08-06 Update
- GB/T 13306 Plates
- GB/T 1348-2019 Spheroidal graphite iron castings
- GB/T 3374.1 Vocabulary of gear terms-Part 1:Definitions related to geometry
- GB/T 3480.5 Calculation of load capacity of spur and helical gears—Part 5：Strength and quality of materials
- GB/T 3505 Geometrical Product Specifications(GPS).Surface texture:Profile method.Terms,definitions and surface texture parameters
- GB/T 37400.1 Heavy mechanical general technical specification—Part 1:Products inspection and test
- GB/T 37400.10 Heavy mechanical general technical specification—Part 10：Assembling
- GB/T 37400.13 Heavy mechanical general technical specification—Part 13：Packaging
- GB/T 37682 Technical conditions for large open gear steel castings
- GB/T 37683 Large gear and ring gear forgings Technical conditions
- GB/Z 18620.1 Cylindrical gears.Code of inspection practice.Part 1: Inspection of corresponding flanks of gear teeth
- GB/Z 18620.2 Cylindrical gears.Code of inspection practice.Part 2: Inspection related to radial composite deviations, runout, tooth thickness and backlash
- ISO 3448 Industrial liquid lubricants - ISO vicosity classification; Technical Corrigendum 1
GB/T 37400.18-2023 history
- 2023 GB/T 37400.18-2023 General technical conditions for heavy machinery Part 18: Open gear transmission system
