CN109885901A - A kind of speed changer welded gear intensity and fatigue life calculation method - Google Patents
A kind of speed changer welded gear intensity and fatigue life calculation method Download PDFInfo
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- CN109885901A CN109885901A CN201910083065.XA CN201910083065A CN109885901A CN 109885901 A CN109885901 A CN 109885901A CN 201910083065 A CN201910083065 A CN 201910083065A CN 109885901 A CN109885901 A CN 109885901A
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Abstract
The invention discloses the intensity and fatigue life calculation method of a kind of speed changer welded gear, including Finite Element Analysis Modeling, Strength co-mputation and Calculation of Fatigue Life, Finite Element Analysis Modeling is by transmission shaft, synchromesh gear hub, tooth set, in conjunction with gear ring, welded gear, needle bearing establishes finite element model, Strength co-mputation is using gear top as zero point, it takes every 20 ° on pitch circle at one o'clock as a loading position clockwise about circumferential direction in gear engagement position, calculates the stress result under each different positions of engagement；With the static strength calculated result under each different positions of engagement, the fatigue life of all torque levels is overlapped at last for fatigue life gage, to obtain the welded gear fatigue life under respective loads spectrum.The present invention improves the accuracy of welded gear Strength co-mputation and Calculation of Fatigue Life, overcomes the deficiencies in the prior art, avoids repeating to research and develop, and is conducive to save social resources and promote technological progress.
Description
Technical field
The present invention relates to speed changer welded gear manufacturing technology, in particular to the intensity of a kind of speed changer welded gear and tired
Labor Life Calculating Methods.
Background technique
Welded gear has many advantages, such as that light-weight, small in size, difficulty of processing is small, saves raw material, is with short production cycle, thus
It is used widely in Light-duty Vehicle, passenger car speed changer.Speed changer welded gear working condition be by alternating shock load,
It is required that it is with good comprehensive mechanical property.To reduce development cost and shortening the development cycle, the design rank in vehicle is needed
Section is designed verifying by calculating.At present, it is common practice to use simple either simplex condition Limit Calculation Method, calculate knot
Fruit differs larger with the actual life of welded gear.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of speed changer welded gear intensity and fatigue lives
Calculation method can cover welded gear actual working state and intensity and Calculation of Fatigue Life based on the durable loading spectrum of vehicle,
Check just is designed to welded gear in the design phase of speed changer, development cost is reduced and shortens the development cycle, guarantee weldering
It connects gear and meets intensity and durable requirement under actual condition.
The purpose of the present invention is what is be achieved through the following technical solutions.A kind of speed changer welded gear intensity and fatigue life
Calculation method, including Finite Element Analysis Modeling, static strength calculate and Calculation of Fatigue Life, it is characterised in that:
The Finite Element Analysis Modeling is to pass sequentially through foundation analysis geometrical model, divide network settings contact, setting material category
Property and setting boundary condition complete；Initially set up transmission shaft, synchromesh gear hub, tooth set, in conjunction with gear ring, welded gear and needle roller axis
The accurate geometry model held, the dimensional tolerance of external splines takes the maximum upper deviation, the size of synchromesh gear hub internal spline on transmission shaft
Tolerance takes minimum lower deviation；Extract above-mentioned geometrical model again, to transmission shaft, synchromesh gear hub, tooth set, in conjunction with gear ring and welding tooth
Wheel carries out grid dividing respectively；Stress circular hole is wherein established respectively at the root of weld of welded gear and weld seam both ends groove, carefully
Change welded seam area grid, and correspond the grid node between gear weld seam connecting portion, by the way that each section knot is arranged
Contact relation between structure guarantees the accurate transmission of load；
Static strength calculating be using any one meshing point of gear as starting point, gear engagement position around circumferential direction on pitch circle
Take every 20 ° at one o'clock as a loading position, and using the engagement force in engine torque lower gear as load, to circumferential direction
Each position of engagement of segmentation applies load and carries out Static Strength Analysis, calculates the stress knot under each different positions of engagement
Fruit；Using static analysis as a result, it is approximate as transient analysis as a result, be equivalent to the stress course that welded gear rotation turns around,
To obtain the welded gear intensity results checked from each orientation；
At last with the static strength calculated result under each different positions of engagement, simulation gear rotates a circle the fatigue life gage
Stress variation process, using the load of Static Strength Analysis as benchmark load, in conjunction with all different torque water of the durable loading spectrum of vehicle
It is flat, stress course is zoomed in and out, the stress field under each torque level is obtained, then according to corresponding rotating cycle, weldering
Material parameter and S-N curve are connect, the fatigue life under each torque level is calculated separately, finally by the tired longevity of all torque levels
Life is overlapped, to obtain the welded gear fatigue life under respective loads spectrum.
Further, radius r=0.05mm of the stress circular hole.
The present invention by the transmission shaft that will interact with welded gear, synchromesh gear hub, tooth set, in conjunction with gear ring, needle roller
Bearing and consideration enter finite element analysis model, and more fitting is practical, avoid only analyzing single welded gear without considering that load is damaged
Result caused by mistake is unreasonable；Method by establishing stress circular hole in commissure, can be by welding material and base material difference, weldering
The complex effects combined factors such as thermal deformation are connect to consider to enter computation model；The side loaded by dividing welded gear pitch circle
Method obtains the stress variation process that welded gear rotates a circle；According to static strength calculated result, carload can be quickly calculated
Compose the fatigue life of lower welded gear.The accuracy for improving welded gear Strength co-mputation and Calculation of Fatigue Life overcomes existing
There is the deficiency of technology, avoid repeating to research and develop, is conducive to save social resources and promote technological progress.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention；Fig. 2 is the geometrical model sectional structure chart of welded gear in the present invention；
Fig. 3-1 is the finite element model positive structure schematic of welded gear in the present invention；
Fig. 3-2 is the finite element model reverse structure schematic of welded gear in the present invention；
Fig. 4 is commissure sectional view of the invention；Fig. 5 is load application position figure of the invention.
Specific embodiment
Now in conjunction with drawings and examples, the invention will be further described.Referring to Fig. 1 to Fig. 5, a kind of speed changer welding tooth
Intensity and fatigue life calculation method are taken turns, including Finite Element Analysis Modeling 1, static strength calculate 2 and Calculation of Fatigue Life 3:
First part, Finite Element Analysis Modeling 1 are to pass sequentially through foundation analysis geometrical model 101, divide network settings contact
102, material properties 103 are set and setting boundary condition 104 is completed.
Firstly, establishing transmission shaft 21, synchromesh gear hub 22, tooth covers 23, in conjunction with gear ring 24, welded gear 25 and needle bearing
26 accurate geometry model (as shown in Figure 2), the dimensional tolerance of external splines takes the maximum upper deviation, synchromesh gear hub on transmission shaft 21
The dimensional tolerance of 22 internal splines takes minimum lower deviation.Secondly, extract above-mentioned geometrical model, to transmission shaft 21, synchromesh gear hub 22,
Tooth set 23 carries out grid dividing in conjunction with gear ring 24 and welded gear 25 respectively (as shown in Fig. 3-1 and Fig. 3-2).Consider welding material
Material is different from gear material, since the factors such as deformation, welding quality influence after welding, so that the material property after welding becomes
Must be complicated, so the stress circular hole 01 of r=0.05mm, stress circular hole 02 are established respectively at the root of weld 41,42 both ends of weld groove
And stress circular hole 03(is as shown in Figure 4), circular is discrete using hexahedral element progress, at least divides six layers of grid, weld seam
Structure is consistent with practical structures, and the grid of commissure and weld seam near zone structure needs to refine, the grid of each section
Node needs to correspond.Rest part in addition to weld metal zone is carried out discrete using tetrahedral grid.(such as scheme after having divided grid
Shown in 3-1 and Fig. 3-2), Constraints of Equilibrium equation simulation needle bearing is used between transmission shaft 21 and welded gear 25, transmitting passes
Active force between moving axis 21 and welded gear 25；In synchromesh gear hub 22 and tooth set 23, tooth set 23 and combine gear ring 24, transmission
CONTACT WITH FRICTION is established respectively between axis 21 and synchromesh gear hub 22, transmission shaft 21 and synchromesh gear hub 22, to guarantee the standard of load
Really transmitting.Then, 32 covered to transmission shaft 21, synchromesh gear hub 22, tooth, assigned respectively in conjunction with gear ring 24, welded gear 25 accordingly
Material properties, wherein to commissure setting welding material material properties.Finally, to structure setting boundary condition.To transmission
Axis 21, one end constrain radially and tangentially, and the other end constrains radial, tangential, axial direction and is pivoted direction.
Second part, the method that static strength calculates 2.The engagement force of engine name torque lower gear is calculated as load
Lotus, gear engagement position around circumferential direction on pitch circle using 51 position of meshing point as starting point, take point to make every central angle a=20 °
For a loading position (as shown in Figure 5).Load is applied to each position of engagement circumferentially divided and carries out Static Strength Analysis, meter
The stress result under each different positions of engagement is calculated, using static analysis as a result, approximation is as transient analysis as a result, equivalent
The stress course to turn around is revolved for welded gear.It calculates separately engine driving operation state and counter drag welds tooth under working condition
Stress distribution is taken turns, to obtain the welded gear strength Calculation Result checked from each orientation.
Part III, the method for Calculation of Fatigue Life 3.The durable loading spectrum 302 of vehicle is transformed into shifting gear first, with
Engine name torque is benchmark load, and each torque level in the durable loading spectrum 302 of vehicle is removed in the name of torque and obtains a system
Column coefficient.To calculate the stress variation mistake to rotate a circle every the stress result simulation gear under the position of engagement of central angle a=20 °
Journey, in conjunction with all different torque levels of the durable loading spectrum 302 of vehicle, is obtained using the stress variation process as benchmark multiplied by front
A series of coefficients arrived are completed to carry out linear scale to stress course, to obtain the stress field under each torque level, then
It is calculated separately according to rotating cycle, welding material parameter and the S-N curve 301 under each torque level and welds tooth under each torque level
The fatigue life of wheel is finally overlapped the fatigue life of each torque level, obtains the welding tooth under corresponding carload spectrum
Take turns endurance life.
Since welding material and gear fertile material are different, since the factors such as deformation, welding quality influence after welding,
So that the stress after welding becomes complicated, the method for the present invention concentrates the side of circular hole by establishing commissure r=0.05mm stress
The complex effects combined factors such as welding material and base material difference, welding thermal deformation can be considered to enter computation model by method；Together
When, to obtain the actual stress course of one swing circle of welded gear be it is highly difficult, the method for the present invention in gear by nibbling
Coincidence, which is set, to be used as a loading position every central angle a=20 ° on pitch circle around circumferential direction and carries out static strength respectively to each position
It calculates, obtains the stress variation process that gear rotates a circle, and it is tired under each torque level to combine carload spectrum to calculate separately
The fatigue life of all torque levels finally is overlapped to obtain the welded gear tired longevity under respective loads spectrum by the labor service life
Life.
Claims (2)
1. a kind of speed changer welded gear intensity and fatigue life calculation method, including Finite Element Analysis Modeling, static strength calculate
And Calculation of Fatigue Life, it is characterised in that:
The Finite Element Analysis Modeling is to pass sequentially through foundation analysis geometrical model, divide network settings contact, setting material category
Property and setting boundary condition complete；Initially set up transmission shaft, synchromesh gear hub, tooth set, in conjunction with gear ring, welded gear and needle roller axis
The accurate geometry model held, the dimensional tolerance of external splines takes the maximum upper deviation, the size of synchromesh gear hub internal spline on transmission shaft
Tolerance takes minimum lower deviation；Extract above-mentioned geometrical model again, to transmission shaft, synchromesh gear hub, tooth set, in conjunction with gear ring and welding tooth
Wheel carries out grid dividing respectively；Stress circular hole is wherein established respectively at the root of weld of welded gear and weld seam both ends groove, carefully
Change welded seam area grid, and correspond the grid node between gear weld seam connecting portion, by the way that each section knot is arranged
Contact relation between structure guarantees the accurate transmission of load；
Static strength calculating be using any one meshing point of gear as starting point, gear engagement position around circumferential direction on pitch circle
Take every 20 ° at one o'clock as a loading position, and using the engagement force in engine torque lower gear as load, to circumferential direction
Each position of engagement of segmentation applies load and carries out Static Strength Analysis, calculates the stress knot under each different positions of engagement
Fruit；Using static analysis as a result, it is approximate as transient analysis as a result, be equivalent to the stress course that welded gear rotation turns around,
To obtain the welded gear intensity results checked from each orientation；
At last with the static strength calculated result under each different positions of engagement, simulation gear rotates a circle the fatigue life gage
Stress variation process, using the load of Static Strength Analysis as benchmark load, in conjunction with all different torque water of the durable loading spectrum of vehicle
It is flat, stress course is zoomed in and out, the stress field under each torque level is obtained, then according to corresponding rotating cycle, weldering
It connects material parameter and S-N curve calculates separately fatigue life under each torque level, finally by the tired longevity of all torque levels
Life is overlapped, to obtain the welded gear fatigue life under respective loads spectrum.
2. the intensity and fatigue life calculation method of speed changer welded gear according to claim 1, which is characterized in that institute
State radius r=0.05mm of stress circular hole.
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| CN201910083065.XA CN109885901B (en) | 2019-01-29 | 2019-01-29 | Method for calculating strength and fatigue life of transmission welded gear |
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| CN201910083065.XA CN109885901B (en) | 2019-01-29 | 2019-01-29 | Method for calculating strength and fatigue life of transmission welded gear |
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| CN109885901B CN109885901B (en) | 2022-09-16 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111950178A (en) * | 2020-07-22 | 2020-11-17 | 中国第一汽车股份有限公司 | Gear automatic loading method based on HyperWorks software |
| CN112052510A (en) * | 2019-12-12 | 2020-12-08 | 格特拉克（江西）传动系统有限公司 | Method for checking slip risk of bolted connection of differential mechanism based on dynamic load |
| CN112580219A (en) * | 2020-12-25 | 2021-03-30 | 江苏集萃复合材料装备研究所有限公司 | Method for evaluating influence of gear fit clearance on system response based on dynamics |
| CN113032927A (en) * | 2021-03-30 | 2021-06-25 | 弗兰德传动系统有限公司 | Broken line layout gear box design system and method |
| CN113204845A (en) * | 2021-04-30 | 2021-08-03 | 湖南南方宇航高精传动有限公司 | Hardness conversion system |
| CN113866021A (en) * | 2021-10-08 | 2021-12-31 | 河南航天精工制造有限公司 | Welding performance testing method and tool for welded gear disc |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112052510A (en) * | 2019-12-12 | 2020-12-08 | 格特拉克（江西）传动系统有限公司 | Method for checking slip risk of bolted connection of differential mechanism based on dynamic load |
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| CN111950178A (en) * | 2020-07-22 | 2020-11-17 | 中国第一汽车股份有限公司 | Gear automatic loading method based on HyperWorks software |
| CN111950178B (en) * | 2020-07-22 | 2022-08-16 | 中国第一汽车股份有限公司 | Gear automatic loading method based on Hyperworks software |
| CN112580219A (en) * | 2020-12-25 | 2021-03-30 | 江苏集萃复合材料装备研究所有限公司 | Method for evaluating influence of gear fit clearance on system response based on dynamics |
| CN112580219B (en) * | 2020-12-25 | 2024-02-02 | 江苏集萃复合材料装备研究所有限公司 | Method for evaluating influence of gear fit clearance on system response based on dynamics |
| CN113032927A (en) * | 2021-03-30 | 2021-06-25 | 弗兰德传动系统有限公司 | Broken line layout gear box design system and method |
| CN113204845A (en) * | 2021-04-30 | 2021-08-03 | 湖南南方宇航高精传动有限公司 | Hardness conversion system |
| CN113204845B (en) * | 2021-04-30 | 2022-09-06 | 湖南南方宇航高精传动有限公司 | Hardness conversion system |
| CN113866021A (en) * | 2021-10-08 | 2021-12-31 | 河南航天精工制造有限公司 | Welding performance testing method and tool for welded gear disc |
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| CN109885901B (en) | 2022-09-16 |
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