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GB/T 19073-2018

Chinese Standard: 'GB/T 19073-2018'
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Detail Information of GB/T 19073-2018; GB/T19073-2018
Description (Translated English): Wind turbine--Design requirements for gearbox
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: F11
Classification of International Standard: 27.180
Word Count Estimation: 142,191
Date of Issue: 2018-02-06
Date of Implementation: 2018-09-01
Drafting Organization: Nanjing High Speed ??Gear Manufacturing Co., Ltd., Shenyang Institute of Technology Wind Energy Technology Research Institute, Chongqing Gearbox Co., Ltd., Hangzhou Advance Gearbox Group Co., Ltd., Zhejiang Yunda Wind Power Co., Ltd., Dongfang Electric Wind Power Co., Ltd., Guodian United Power Technology Co., Ltd. Company, Gemeiyi Wind Power (Tianjin) Co., Ltd.
Administrative Organization: National Wind Machinery Standardization Technical Committee (SAC/TC 50)
Proposing organization: China Machinery Industry Federation
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration

GB/T 19073-2018
Wind turbine-Design requirements for gearbox
ICS 27.180
National Standards of People's Republic of China
Replace GB/T 19073-2008
Wind turbine gearbox design requirements
(IEC 61400-4.2012,
Windturbine-Part 4. Designrequirementsforwindturbinegearboxs, IDT)
Published on.2018-02-06
2018-09-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword V
1 range 1
2 Normative references 1
3 Terms and definitions, conventions 3
3.1 Terms and Definitions 3
3.2 Convention 5
3.2.1 Name of bearing position 5
3.2.2 Nomenclature of the shaft---Typical wind turbine gearbox structure example 5
4 symbols and abbreviations 7
4.1 Symbol 7
4.2 Abbreviations 13
5 Reliability Design 15
5.1 Design life and reliability 15
5.2 Design Process 16
5.3 Document 18
5.4 Quality Plan 18
6 drive chain operating conditions and loads 18
6.1 Drive Chain Description 18
6.1.1 Overview 18
6.1.2 Interface Definition 18
6.1.3 Clear interface requirements 19
6.2 Drive Chain Load Extraction 19
6.2.1 Wind turbine load simulation model 19
6.2.2 Wind turbine load calculation 20
6.2.3 Load reliability assumption 20
6.3 Wind turbine load calculation results 21
6.3.1 Overview 21
6.3.2 Time series 21
6.3.3 Fatigue load 21
6.3.4 Ultimate load 22
6.4 Operating conditions 22
6.4.1 Overview 22
6.4.2 Environmental conditions 22
6.4.3 Operational Control Strategy 22
6.5 Drive Chain Analysis 23
7 Gearbox design, evaluation and manufacturing requirements 23
7.1 Gearbox cooling 23
7.2 Gear 23
7.2.1 Gear reliability 23
7.2.2 Gear evaluation 24
7.2.3 Load factor 25
7.2.4 Gear material 27
7.2.5 Primary surface initial fatigue 27
7.2.6 Gear accuracy 27
7.2.7 Gear Manufacturing 27
7.3 Bearing 28
7.3.1 Overview 28
7.3.2 Bearing reliability 28
7.3.3 Bearing steel quality requirements 28
7.3.4 Design Summary 29
7.3.5 Bearing selection specification 31
7.3.6 Bearing design 32
7.3.7 Bearing lubrication 34
7.3.8 Bearing evaluation calculation 35
7.4 Shafts, keys, cabinet connections, splines and fasteners 38
7.4.1 Shaft 38
7.4.2 Hub connection 38
7.4.3 Flexible spline 39
7.4.4 Shaft seal 39
7.4.5 Fasteners 39
7.4.6 Retaining ring (snap ring) 40
7.5 structural member 40
7.5.1 Introduction 40
7.5.2 Reliability factor 40
7.5.3 Deformation analysis 40
7.5.4 Strength check 40
7.5.5 Static strength assessment 41
7.5.6 Fatigue strength assessment 44
7.5.7 Material Testing 48
7.5.8 File 48
7.6 Lubrication 49
7.6.1 Overview 49
7.6.2 Type of lubricant 49
7.6.3 Lubricant characteristics 50
7.6.4 Lubrication method 51
7.6.5 Oil quantity 52
7.6.6 Operating temperature 52
7.6.7 Temperature Control 52
7.6.8 Lubricant Condition Monitoring 53
7.6.9 Lubricant cleanliness 53
7.6.10 Lubricant filter 54
7.6.11 Interface 54
7.6.12 Level gauge 55
7.6.13 Magnetic oil plug 55
7.6.14 Air filter 55
7.6.15 Flow sensor 56
7.6.16 Maintainability 56
8 Design verification 56
8.1 Overview 56
8.2 Test plan 56
8.2.1 Determining test criteria 56
8.2.2 New design and substantive changes 56
8.2.3 Overall Test Plan 57
8.2.4 Special test plan 57
8.3 Factory Type Test 57
8.3.1 Overview 57
8.3.2 Component test 57
8.3.3 Gearbox Prototype Factory Test 57
8.3.4 Lubrication system test 58
8.4 Wind field test 58
8.4.1 Overview 58
8.4.2 Load verification 58
8.4.3 Gearbox type test in wind turbines 59
8.5 Production test 60
8.5.1 Acceptance test 60
8.5.2 Noise test 60
8.5.3 Vibration test 60
8.5.4 Notes on Lubrication System 60
8.5.5 System temperature 60
8.6 Robustness test 60
8.7 Lubricant temperature and cleanliness 60
8.8 Bearing characteristics confirmation 60
8.8.1 Design Review 60
8.8.2 Prototype Verification/Confirmation 61
8.9 Test Record 61
9 Operation, service and maintenance requirements 62
9.1 Service and Maintenance Requirements 62
9.2 Inspection requirements 62
9.3 Running and running 62
9.4 Transportation, Handling and Storage 62
9.5 Maintenance 62
9.6 Installation and Replacement 62
9.7 Condition Monitoring 63
9.8 Lubrication 63
9.8.1 Lubricant Type Requirements 63
9.8.2 Lubrication system 63
9.8.3 Oil Testing and Analysis 63
9.9 Operation and Maintenance Instructions 63
Appendix A (informative) Example of drive chain interface and load specification 64
Appendix B (informative) Considerations in the design and manufacture of gearboxes 74
Appendix C (informative) Bearing selection considerations 77
Appendix D (informative) Notes on the design of the gearbox structural components 101
Appendix E (informative) Wind turbines recommendations for the performance of wind turbine gearbox lubricants 104
Appendix F (informative) Design certification document 118
Appendix G (informative) Bearing calculation document 121
References 129
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 19073-2008 "Wind Generator Gearbox", compared with GB/T 19073-2008, the main technology
The differences are as follows.
---Modified standard name;
--- Normative references have been added to the referenced ISO and DIN standards (see Chapter 2);
--- Add "terms and definitions, conventions" (see Chapter 3);
--- Add "symbols and abbreviations" (see Chapter 4);
--- Increase the "reliability design" (see Chapter 5);
--- Increase "transmission chain operating conditions and loads" (see Chapter 6);
--- "Design verification" instead of "test methods and inspection rules" (see Chapter 8, Chapter 4 of the.2008 edition);
--- "Operation, service and maintenance requirements" instead of "the installation and use of the gearbox in the unit" "marks, instructions for use" and "packaging, transport
Loss and storage" (see Chapter 9, Chapter 5, Chapter 7 of the.2008 edition);
--- "Example of transmission chain interface and load specification" instead of "Guidelines for strength assessment of main parts of gearbox" (see Appendix A,.2008 edition)
Appendix A);
--- "Considerations in the design and manufacture of gearboxes" instead of "lubrication and monitoring" (see Appendix B, Appendix B of the.2008 edition);
--- "Bearing selection considerations" instead of "bearing selection and configuration form" and "bearing stress calculation" (see Appendix C,.2008 edition)
Appendix C);
--- "Notes on the design of the gearbox structural components" instead of "bearing stress calculation" (see Appendix D, Appendix D of the.2008 edition);
--- "Wind generators recommendations on the performance of wind turbine gearbox lubricants" instead of "quality assurance" (see Appendix E,.2008)
Appendix E);
---Add "design certification documents" (see Appendix F);
--- Increase the "bearing calculation file" (see Appendix G).
This standard uses the translation method equivalent to IEC 61400-4.2012 "Wind Generator Section 4. Gearbox Design Requirements" (English)
The documents of our country that have a consistent correspondence with the international documents referenced in this standard are as follows.
---GB/T 3505-2009 Product Geometry Specifications (GPS) Surface structure profiling terms, definitions and surface structures
Parameters (ISO 4287.1997, IDT)
---GB/T 4662-2012 Rolling bearing rated static load (ISO 76.2006, IDT)
---GB/T 6379.2-2004 Accuracy of measurement methods and results (accuracy and precision) Part 2. Determination of standard
Basic method of repeatability and reproducibility of quantity methods (ISO 5725-2.1994, IDT)
GB/T 6404.1-2005 - Acceptance specification for gear units - Part 1. Test specification for airborne noise (ISO 8579-
1.2002, IDT)
--- GB /Z 6413.1-2003 Calculation method for gluing load capacity of cylindrical gears, bevel gears and hypoid gears - Part 1.
Flash temperature method (ISO /T R13989-1.2000, IDT)
--- GB /Z 6413.2-2003 Calculation method for gluing load capacity of cylindrical gears, bevel gears and hypoid gears - Part 2.
Integral temperature method (ISO /T R13989-2.2000, IDT)
--- GB/T 10095.1-2008 Precision of cylindrical gears - Part 1. Definitions and permissible values
(ISO 1328-1.1995, IDT)
---GB/T 10610-2009 Product Geometry Technical Specification (GPS) Surface structure profiling method for assessing surface structure
And methods (ISO 4288.1996, IDT)
---GB/T 14039-2002 Hydraulic transmission oil solid particle pollution level code (ISO 4406.1999, MOD)
---GB/T 17879-1999 Surface tempering corrosion test after gear grinding (idtISO 14104.1995)
--- GB /Z 18620.3-2008 Specification for the implementation of cylindrical gears - Part 3. Gears, axial distance and axis parallelism
Inspection (ISO /T R10064-3.1996, IDT)
---GB /Z 19414-2003 Industrial closed gear transmission (ISO /T R13593.1999, IDT)
---GB /Z 25426-2010 Wind turbine generator load measurement (IEC /T S61400-13.2001, MOD)
---GB/T 31517-2015 Offshore wind turbine design requirements (IEC 61400-3.2009, IDT)
This standard has been edited as follows.
---Modified standard name;
--- Amend the missing reference standards ISO 10474, EN10204, ISO 8579-1 and ISO 8579-2 in Chapter 2.
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Wind Machinery Standardization Technical Committee (SAC/TC50).
This standard was drafted. Nanjing High Speed Gear Manufacturing Co., Ltd., Institute of Wind Energy Technology, Shenyang University of Technology, Chongqing Gearbox Co., Ltd.
Ren, Hangzhou Advance Gearbox Group Co., Ltd., Zhejiang Yunda Wind Power Co., Ltd., Dongfang Electric Wind Power Co., Ltd., Guodian
United Power Technology Co., Ltd., Gemei Wind Power (Tianjin) Co., Ltd.
The main drafters of this standard. He Aimin, Sun Yizhong, Zhang Hechao, Zhang Bo, Wang Jinjuan, Mao Hongyu, Yao Xingjia, Lu Hesheng, Gao Bo, Xuan Anguang,
Li Xingya, Chen Qi, Chen Jingxin, Liu Hua, Dong Li, Sun Li, Cheng Xiaohui, Liu Wei.
The previous versions of the standards replaced by this standard are.
---GB/T 19073-2003, GB/T 19073-2008.
Wind turbine gearbox design requirements
1 Scope
This standard is applicable to closed speed-increasing gearboxes of horizontal shaft wind turbine power trains with rated power greater than 500 kW. this
The standard applies to wind turbine gearboxes installed on land or at sea.
This standard provides guidance for load analysis of gear and gearbox components designed in wind turbines.
The gear parts to which this standard applies include. parallel shafts in the main drive chain and planetary gears, such as spur gears, helical gears or herringbone teeth.
wheel. This standard does not apply to gear power take-off devices (PTO).
This standard is based on the design of a gearbox using rolling bearings. The use of plain bearings allows reference to this standard, but this standard does not include slippage.
Evaluation of the use of moving bearings.
This standard also provides engineering guidance for shaft, shaft and hub interfaces, bearings and gearbox housing structures in a fully integrated design.
Its poor operating conditions.
In addition to type testing and product testing, this standard also includes lubrication of the transmission. Finally, this standard also applies to the operation of the gearbox.
Maintenance provides guidance.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 3480.5-2008 Calculation of load capacity of spur and helical gears - Part 5. Strength and mass of materials (ISO 6336-5.
2003, IDT)
GB/T 6391-2010 Dynamic load ratings and rating life of rolling bearings (ISO 281.2007, IDT)
GB/T 18451.1-2012 Wind turbine design requirements (IEC 61400-1.2005, IDT)
GB/T 19936.1-2005 Gears FZG test procedures - Part 1. s.
Act A/8.3/90 (ISO 14635-1.2000, IDT)
GB/T 24611-2009 Rolling bearing damage and failure terminology, characteristics and causes (ISO 15243.2004, IDT)
IEC 60050 (all parts) International electrotechnical vocabulary (International Electrotechnicalvocabulary), cited from http.//
IEC 61400-3 Wind turbines - Part 3. Design requirements for offshore wind turbines (Windturbines-Part 3. De-
IEC /T S61400-13.2001 Wind turbines Part 13. Mechanical load measurement (Windturbinegeneratorsys-
tems-Part 13. Measurementofmechanicalloads)
IEC 61400-22.2010 Wind turbines Part 22. Conformance testing and certification (Windturbines-Part 22.
ISO 76 rolling bearing rated static load (Rolingbearings-Staticloadratings)
ISO 683 (all parts) Heat-treated steel, alloy steel and free-cutting steel (Heat-treatablesteels, aloysteelsandfree-
dricalgears-ISO systemofaccuracy-Part 1. Definitionsandalowablevaluesofdeviationsrelevant
ISO 4287 Product Geometry Specification (GPS) Surface Texture. Section Method Terms, Definitions, and Surface Texture Parameters [Geometrical]
ISO 4288 Product Geometry Specification (GPS) Surface Texture. Rules and Procedures for Profile Surface Texture Evaluation [Geomet-
ISO 4406 Hydraulic fluid power fluid solid particle pollution classification coding method (Hydraulicfluidpower-Fluids-
Accuracy of measurement methods and results of ISO 5725-2 Part 2. Basic test for reproducibility and reducibility of standard measurement methods
Method [Accuracy (truenessandprecision)ofmeasurementmethodsandresults-Part 2.Basic
ISO 6336 (all parts) Calculation of load carrying capacity of spur and helical gears (Calculationofloadcapacityofspur
ISO 6336-1.2006 Calculation of load carrying capacity of spur and helical helical gears - Part 1. Basic principles, introduction and general influence
Factors (Calculationofloadcapacityofspurandhelicalgears-Part 1.Basicprinciples,induction
ISO 6336-2.2006 Calculation of load carrying capacity of spur and helical helical gears - Part 2. Calculation of surface durability [Calcula-
tionofloadcapacityofspurandhelicalgears-Part 2.Calculationofsurfacedurability(pitting)]
ISO 6336-3.2006 Calculation of load capacity of spur and helical gears - Part 3. Calculation of root bending strength (Cal-
culationofloadcapacityofspurandhelicalgears-Part 3.Calculationoftoothbendingstrength)
ISO 6336-6.2006 Calculation of load capacity of spur and helical gears - Part 6. Life calculations for variable load conditions
(Calculationofloadcapacityofspurandhelicalgears-Part 6.Calculationofservicelifeundervariable
ISO 8579-1 Acceptance specification for gear units - Part 1. Test specification for airborne noise (Acceptancecodefor
gearunits-Part 1.Testcodeforairbornesound)
ISO 8579-2. Acceptance specifications for gear units - Part 2. Determination of mechanical vibrations of gear units in acceptance tests (Acceptance
codeforgears-Part 2.Determinationofmechanicalvibrationsofgearunitsduringacceptancetesting)
ISO /T R10064-3 Inspection procedures for the use of cylindrical gears - Part 3. Gear blanks, axial distances and parallelisms
Suggestions (Cylindricalgears-Codeofinspectionpractice-Part 3. Recommendationsrelativetogearblanks,
ISO 10474 steel and steel finished product inspection documents (Steelandsteelproducts-Inspectiondocuments)
ISO 12925-1 Lubricants, industrial oils and related (L) products, (gears) C. Part 1. Lubrication for closed gear systems
Agent specifications [Lubricants, industrialoilsandrelatedproducts(classL).FamilyC(Gears)-Part 1.Specifi-
ISO /T R13593 Industrial Closed Gear Transmission (Enclosedgeardrivesforindustrialapplications)
ISO /T R13989-1 Calculation of the splicing load capacity of cylindrical, bevel and hypoid. Part 1 . Instantaneous temperature method (Cal-
Culationofscuffingloadcapacityofcylindrical,bevelandhypoidgears-Part 1.Flashtemperature
ISO /T R13989-2 Calculation of the biting load capacity of cylindrical, bevel and hypoid gears - Part 2. cumulative temperature method (Cal-
Culationofscuffingloadcapacityofcylindrical,bevelandhypoidgears-Part 2.Integraltemperature
ISO 14104 surface temper erosion inspection after gear polishing (Gears-Surfacetemperetchinspectionaftergrind-
ISO /T S16281.2008 Method for calculation of reference values for modified rated life of rolling bearing universal load bearing (Rolingbear-
AGMA9005 Industrial Gear Lubrication (Industrialgearlubrication)
ANSI/AGMA925-A02 Effect of Tooth Surface Lubrication Failure (Effectoflubricationongearsurfacedistress)
ANSI/AGMA6001-E10 Design and Selection of Closed Gear Transmissions (Designandselectionofcomponents
ANSI/AGMA6123 Closed Planetary Gearing Design Manual (Designmanualforenclosedepicyclicgear
ASTME1049-85 Cycle Calculation Procedure for Fatigue Analysis (Standardpracticesforcyclecountinginfatigue
DIN471 shaft circlip. standard and heavy duty [Circlips(retainingrings)forshafts.Normaltypeand
Retaining ring for DIN472 hole. standard and heavy duty [Circlips(retainingrings)forbores.Normaltypeand
DIN 743-2000 Calculation of bearing capacity of shaft parts, part 1, 2, 3 (Shaftsandaxles, calculationsofloadca-
DIN3990-4 Calculation of bearing capacity of cylindrical gears. Calculation of rod bearing capacity (Calculationofloadcapacityofcy-
DIN6885-2 Flat key drive connection and keyway type and size for machine tools (ParalelKeyGeometries)
DIN6892 Calculation and design of taper-free drive-type fastener keys (only in Germany) (Mitnehmerverbindungen
DIN7190 Interference fits calculation and design principles (Interferencefits-Calculationanddesignrules)
DIN51517-3 Lubricants Part 3. CLP for lubricants, minimum requirements (Lubricants. Lubricatingoils-Part 3.
EN10204.2004 Metal product inspection document type (Metalicproducts-Typesofinspectiondocuments)
EN12680-3.2003 Ultrasonic testing of castings (Ultrasonicexamination-Spheroidalgraphitecastironcastings)
3 terms and definitions, conventions
3.1 Terms and definitions
The following terms and definitions defined in GB/T 18451.1-2012 and IEC 60050-415 apply to this document.
Note. The definition of this standard is preferred.
Bearing manufacturer bearingmanufacturer
A legal entity that provides bearings for wind turbine gearboxes and is responsible for bearing design and application engineering.
Note. Bearings are also usually manufactured by bearing suppliers.
Certification body certificationbody
An entity that qualifies a wind turbine gearbox in accordance with IEC 61400-22.
Characteristic load
A load whose load value does not exceed the specified probability.
Note. See 3.1.5 Design Loads.
Design life designlifetime
The duration of the specified strength verification is met.
Note. Some easy-to-maintain components and consumables may last less than the specified gearbox design life.
Design load designload
The load used to verify the strength of any part.
Note 1. The design load is obtained by multiplying the characteristic load by the appropriate load local safety factor.
Note 2. See GB/T 18451.1-2012 and Chapter 6.
Double row bearing double-rowbearings
Rolling bearings with double row rolling elements.
Equivalent load
With the specified life index and number of cycles, the load with the same damage is caused by the actual change load.
Note. The equivalent load is not equal to the average load value of all load segments over the entire load range.
Extreme load extremeload
Design load with the largest absolute value of all load components in running or non-running conditions.
Note. The load component can be a force, a torque, a torque, or a combination thereof.
Gearbox manufacturer gearboxmanufacturer
The entity responsible for the design of the gearbox and specifying the manufacturing requirements for the gearbox and its components.
Note. In practice, some legal entities may be involved in this process, but this is not reflected in this standard.
The type and size of the gearbox to be connected to the wind turbine, and the type of control signal, hydraulic oil and lubricant exchange
Style and size.
Load margin factor loadreservefactor
The ratio of the maximum allowable load of the component to the design load.
Note. LRF can be determined from the ultimate strength and fatigue strength calculations, respectively.
Local failure localfailure
In a dangerous section, the strain exceeds the maximum allowable value and the failure occurs.
Positioning bearing locatingbearingfixedbearing
Bearings that are subjected to biaxial axial loads.
Lubricant supplier lubricantsupplier
Lubrication of wind turbine gearboxes by wind turbine manufacturers, gearbox manufacturers or wind turbine owners
The legal entity of oil.
Note. Lubricant suppliers may not produce any lubricant components or mix the final product proportionate, but are responsible for the performance and mixing specifications of the lubricant.
Maximum operating load maximumoperatingload
The maximum load of the fatigue analysis determined according to the design conditions and the local safety factor of the load as defined in GB/T 18451.1-2012.
Cabin nacele
The structure above the unit tower houses the power train, generators, other components, controls and the execution system.
Floating end bearing non-locatingbearing
Floating bearing floatingbearing
Bearings that are only subjected to radial loads.
Paired bearing pairedbearings
Install two bearings of the same type in the same position.
Note. The mating arrangement of the bearings results in their radial load carrying capacity and bidirectional axial load carrying capacity (eg two TRB bearings or two)
ACBB bearings are placed face to face or back to back), or they can be arranged in series to enhance radial load carrying capacity and unidirectional axial load carrying capacity (see C.7).
Rain flow matrix rainflowmatrices
Using a two-dimensional matrix containing a counting cycle, this cycle occurs in the sub-range of the cyclic mode and amplitude, representing the fatigue load.
Note. See A.4.3.
Time series timeseries
Describe the time set of different operating load intervals for wind turbines.
Note. These time series are combined with their corresponding occurrences to characterize the load history over the life of the design.
Wind turbine manufacturer windturbinemanufacturer
The responsible entity for the gearbox design requirements is proposed in accordance with this standard.
Note. Typically, wind turbine manufacturers are responsible for the design, manufacture and sale of wind turbines.
Wind turbine owner windturbineowner
Purchase and responsibility for the operation of the wind turbine.
Note. In fact, the owner can sign up for the operation and maintenance of the wind turbine with different legal entities. This distinction is not reflected in this standard.
3.2 Convention
3.2.1 Name of bearing position
The following abbreviations can be used to define the bearing position (the naming of the axis is defined in 3.2.2).
● RS. the side of the wind wheel (usually the upwind direction);
● GS. Generator side (usually downwind).
If it is a matched bearing, the following abbreviations can be used.
● IB. inside (relative to the inside of the shaft);
● OB. outside (relative to the outside of the axis).
3.2.2 Name of the shaft---A typical example of the wind turbine gearbox structure
Figure 1 shows the definition of the name of the shaft in the 3-stage parallel drive gearbox. In a 4-stage parallel drive gearbox, the middle shaft is called "low speed"
Intermediate shaft "" medium speed intermediate shaft" and "high speed intermediate shaft".
1---HSS high speed shaft;
2---HS-IS high speed intermediate shaft;
3---LS-IS low speed intermediate shaft;
4 ---LSS low speed shaft;
PIN --- power input;
POUT --- power output.
Figure 1 Name definition of the shaft in the 3-stage parallel drive gearbox
Figure 2 shows the definition of the name of the axis in the Class 1 planetary plus 2 parallel drive gearbox.
1---HSS high speed shaft;
2---HS-IS high speed intermediate shaft;
3---LS-IS low speed intermediate shaft;
4---PS planetary shaft;
5 ---LSS low speed shaft;
PIN --- power input;
POUT---power output.
Figure 2 Name definition of the axis in the first-class planetary plus two-stage parallel transmission gearbox
Figure 3 shows the definition of the name of the axis in the 2-stage planetary plus 1 parallel drive gearbox.
1 ---HSS high speed shaft;
2 ---HS-IS high speed intermediate shaft;
3 ---IS-PS medium speed planetary shaft;
4 ---ISS medium speed shaft;
5 ---LS-PS low speed planetary shaft;
6 ---LSS low speed shaft;
PIN --- power input;
POUT---power output.
Figure 3 Name definition of the axis in the 2nd stage planetary plus 1 parallel drive gearbox
4 symbols and abbreviations
4.1 symbol
This standard refers to equations and relationships from several engineering disciplines. So in some cases, the same symbol has inconsistent definitions.
local. Nonetheless, all the symbols in the text are listed in Table 1. In case of ambiguity, the definition specified by the symbol will be in a formula, chart or text.
This article is presented in the form of a note.
Table 1 Symbols used in the text
Symbol description unit
a acceleration mm/s2
a Hertz contact the long semi-axis of the ellipse mm
A1 Reliability life correction factor -
A3 ultimate strain %
A5 ultimate strain %
b Hertz contacts the short semi-axis of the ellipse mm
Table 1 (continued)
Symbol description unit
c stiffness
c unit stress
Basic bearing dynamic load N of C bearing
Lifetime consumption index % of CLIi ith load segment
Uniaxial elastic unit stress at position s of c(s)
The spring constant of the CδL bearing -
Basic static load rating of C0 bearing N
Cij(s) elastic stress tensor at position s of uniaxial unit load
Cij,k(s) elastic stress tensor of unit load K at position s
The average value of the elastic stress tensor at the position s of cij,m(s)
CT contact truncation coefficient -
d damping increment
D cumulative damage -
Di damage caused by the i-th load segment -
Dw bearing rolling element diameter mm
The pitch diameter of the rolling element combination in Dpw bearing mm
e Bearing constant, the ratio of the axial load to the radial load (Fa/Fr) -
eC Lubricant Cleanliness Factor -
Eσij(s,t) elastic stress tensor at position s at time t
Eσij, a(s) local stress tensor amplitude MPa
Eσa, eq(s) equivalent stress amplitude at position s MPa
Eσij,m(s) average local stress tensor MPa
E elastic modulus (Young's modulus) MPa
Table 1 (continued)
Symbol description unit
F force N
F∑δ deviation of the box or the turret in the same plane mm
F∑γ Projection misalignment caused by the misalignment of the ideal axis projected onto the tooth width with respect to the axis
F∑β outer plane deviation of the box or bracket mm
Fa bearing axial load N
fHβ gear spiral deviation mm
Fma gear mesh meshing misalignment mm
Fr bearing radial load N
Gr bearing radial working clearance mm
Moment of inertia kgm2 in the x, y, and z directions in the J coordinate system
k S/N curve tilt index -
k Maximum load bearing rolling element load distribution coefficient -
Kγ meshing load factor -
KFα tooth load distribution coefficient (bending stress) -
KFβ tooth load distribution coefficient (bending stress) -
KHα tooth load distribution coefficient (contact stress) -
KHβ tooth load distribution coefficient (contact stress) -
KIc maximum contact stress and error-free bit line contact stress ratio -
Km misalignment maximum contact stress and no misalignment maximum contact stress ratio -
Kv dynamic load factor -
l length mm
L load value N or Nm
L10mr, i 10% failure probability, corrected reference life of the i-th load segment 106r
La load amplitude N or Nm
La,eq equivalent load amplitude N or Nm
Le elastic load limit N or Nm
Lh10 Basic rating life of 10% failure probability h
Table 1 (continued)
Symbol description unit
A time-dependent load component N or Nm in the Lk(t) time series
Average load N or Nm in the Lm load segment
Lnmr n% failure probability correction reference life rating 106r
Reference nominal life of the Lnr n% failure probability 106r
Lp total yield limit or load limit of plastic deformation N or Nm
LRFf anti-fatigue load margin factor -
LRFu anti-limit load margin factor -
Lwe effective length of the rolling element mm
m mass kg
m Number of load segments in the load spectrum -
M torque Nm
Mn gear normal modulus mm
n probability of failure %
n speed min-1
Neq,j equivalent speed min-1 of the jth load segment in the load spectrum
Niornj number of cycles of the i or jth load segment -
N characteristic stress - the number of cycles of the life curve -
Number of cycles at the inflection point of the stress-life curve of the ND equal-width test specimen
Ni The number of endurance cycles according to the ith load segment of the S/N curve -
The number of times that Ni cycles through the design life cycle -
NL cycle times -
Npl, σ, GF and Rp related global failure local stress section coefficient -
Npl, σ, LF and Rp related local failure local stress section coefficient -
Nref reference loop number -
The index in the equation for calculating the bearing life of p -
P bearing dynamic equivalent load N
Pi, j load value of the i-th or j-th load segment in the load spectrum N
Table 1 (continued)
Symbol description unit
Contact stress of P0 bearing point contact MPa
P0 bearing equivalent static load N
Pel generator's electric power kW
Pline bearing line contact approximate bearing contact stress MPa
Pmax bearing line contact approximate maximum contact stress MPa
Q zero clearance bearing single roller maximum load N
Qi allocation of time, cycle or number of revolutions within the i-th load level -
Qoil Lubricant Quantity L
R stress ratio -
R12 radius of the rolling element in the plane of the rotating shaft mm
R22 groove radius of the raceway cross section mm
Ra arithmetic mean roughness μm
Rm ultimate tensile or compressive strength MPa
Rp yield strength (0.2% plastic strain yield point or displacement yield point) MPa
Rz average peak-to-valley roughness (according to ISO 4287/ISO 4288) μm
s displacement mm
s position variable -
S contact tightness -
S0 (bearing) static safety factor -
SB Glue Safety Factor -
SF bending strength safety factor -
SH contact strength safety factor -
t time variable s
VI Viscosity Index -
Vt pitch line speed m/s
X0 bearing constant, radial static load factor -
Y0 bearing constant, shaft.
Related standard:   GB/T 19068.3-2019  GB/T 19071.1-2018
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