Foreword
This standard is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 8542-1987 Specification for turbine gearings. In addition to structural adjustments and editorial changes, the following main technical changes have been made with respect GB/T 8542-1987:
a) The "Scope" has been modified (see Clause 1 hereof; 1.1 of 1987 edition);
b) "Terms and definitions" have been modified (see Clause 3 hereof; 1.3 of 1987 edition);
c) The clause "Code and overall dimensions" has been added (see Clause 4);
d) Technical requirements for "complete machine" have been added (see 5.1);
e) Technical requirements for "main components" have been modified (see 5.2 hereof; Clause 2 of 1987 edition);
f) Requirements for "assembly" have been added (see 5.4);
g) The clause "Complete machine test method" has been modified (see Clause 6 hereof; Clause 3 of 1987 edition);
e) The clause "Inspection" has been deleted (see Clause 4 of 1987 edition);
l) The clause "Accompanying documents and special tools" has been added (see Clause 7);
j) The clause "Marking, packaging, transportation and storage" has been modified (see Clause 8 hereof; Clause 5 of 1987 edition).
k) The clause "Quality assurance" has been deleted (see Clause 6 of 1987 edition);
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of National Technical Committee on Gear of Standardization Administration of China (SAC/TC 52).
This document was firstly issued in 1987, and this edition is the first revision.
High speed gear units technical specifications
1 Scope
This document specifies the product code, overall dimensions, technical requirements, whole machine test method, accompanying documents and special tools as well as marking, packaging, transportation and storage of high speed gear units [1) The high speed gear units described in this document includes necessary components such as gears, shafts, boxes, sliding bearings, ventilation units, temperature measuring elements, bolts, seals and optional auxiliary components such as turning gears, oil pumps, vibration measuring elements, bases, couplings, oil mist fans. The gear structure is single helical teeth or double helical teeth. See GB/T 1357 for normal modulus of gears. There is generally no common divisor for the number of teeth of large and small gears, and the tooth ratio is generally not an integer.
]1)(hereinafter referred to as "gear units").
This document is applicable to gear units with external meshing involute parallel shaft cylindrical hard tooth surface supported by sliding bearings in petroleum, chemical industry, electric power, metallurgy and other industries, with tooth profile conforming to GB/T1356, pinion speed not less than 3000 r/min or pitch circle linear speed not less than 30 m/s. Other high speed gear units with similar structure may be implemented with reference to this document.
This document does not apply to gear units integrated with other rotating equipment such as prime mover or working machine.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1174 Cast bearing metals
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3181 Colour standard for paint film
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 3836.1 Explosive atmospheres - Part 1: Equipment - General requirements
GB/T 6075.3 Mechanical vibration - Evaluation of machine vibration
by measurements on non-rotating parts - Part 3: Industrial machines with nominal power above 15 kw and nominal speeds between 120 r/min and 15000 r/min when measured in situ
GB/T 6404.1 Acceptance code for gear units - Part 1: Test code for airborne sound
GB/T 9439 Grey iron castings
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 11120 Lubricating oils for turbines
GB/T 11348.3 Mechanical vibration of non-reciprocating machines - Measurements on rotating shafts and evaluation criteria - Part 3: Coupled industrial machines
GB/T 17879 Gears - Surface temper etch inspection after grinding
GB/T 18329.1 Plain bearings - Non-destructive ultrasonic testing of bond for metallic multilayer plain bearings
GB/T 30121 Industrial platinum resistance thermometers and platinum temperature sensors
GB/T 30429 Industrial thermocouple
GB/T 37400.3 Heavy mechanical general techniques and standards - Part 3: Welded parts
GB/T 37683 Large gear and girth gear forgings - Technical specification
GB/T 39332-2020 General requirements for the anti-fatigue manufacturing of precision gears
GB/T 39430 Technical requirements for high reliability gear blanks
JB/T 5078 General specification for quality inspection of gear materials and their heat treatment
JB/T 8831 Methods for oil selection of industrial enclosed gears
JB/T 9050.1 Cylindrical reduction gear units - Part 1: General technical requirement
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 3374.1 and the following apply.
3.1
purchaser
purchaser of gear units
3.2
vendor
manufacturer of gear units
3.3
prime mover
device that consumes energy such as steam, gas, electricity and oil and outputs torque (power) at a certain speed
Note: it mainly includes steam turbines, gas turbines, turboexpanders, flue gas turbines, diesel engines and electric motors.
3.4
working machine
device that is driven by a prime mover and consumes mechanical rotation energy to complete a certain target action or function
3.5
set
group of devices that mainly use rotating equipment such as prime mover, gear units and working machine, and are equipped with auxiliary systems such as connection, control, lubrication, cooling and protection systems to complete specific functions through converting certain input energy into mechanical energy
4 Code and overall dimensions
4.1 Code
4.1.1 Designation
It includes model, center distance, nominal speed ratio and assembly operation type. The designation method is shown as follows:
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Code and overall dimensions
4.1 Code
4.2 Overall dimensions
5 Technical requirements
5.1 Complete machine
5.2 Main components
5.3 Other components
5.4 Assembly
6 Complete machine test method
6.1 Appearance
6.2 Tightness
6.3 Noise
6.4 Lubricating oil
6.5 Temperature
6.6 Vibration
6.7 Explosion prevention
7 Accompanying documents and special tools
7.1 Accompanying documents
7.2 Special tools
8 Marking, packaging, transportation and storage
8.1 Marking
8.2 Packaging and transportation
8.3 Storage
Annex A (Informative) Overall dimensions and connection dimensions
Annex B (Informative) Noise pressure level
Annex C (Informative) Lubrication
Annex D (Informative) Coupler
Annex E (Informative) Requirements for anchor installation
Annex F (Informative) Data provided by the vendor
Annex G (Informative) Selection of service coefficients
Bibliography
