CN101782461A - Automobile gearbox acceleration service life test method - Google Patents
Automobile gearbox acceleration service life test method Download PDFInfo
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- CN101782461A CN101782461A CN201010129921A CN201010129921A CN101782461A CN 101782461 A CN101782461 A CN 101782461A CN 201010129921 A CN201010129921 A CN 201010129921A CN 201010129921 A CN201010129921 A CN 201010129921A CN 101782461 A CN101782461 A CN 101782461A
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Abstract
The invention relates to a 20-ton wheel-type automobile fixed-shaft main-auxiliary box structure gearbox, in particular to a method for testing the acceleration service life of a gearbox through a jack horse. The application frequency of each level of the gearbox is stipulated, a determination method of conventional velocity of the gearbox is stipulated, a wear-in method of the main-auxiliary box structure gearbox is stipulated, a layout method of the test platform is stipulated, and the service life examination test standard of the jack horse is stipulated. The method is used for carrying out the service life examination test of the jack horse, so the test time can be effectively reduced, the cost can be reduced, and the research and development period can be shortened.
Description
Technical field
The present invention relates to fixedly shaft type major-minor box structure wheel box of 20 tonnes of wheeled cars, it is a kind of by carry out the method for gearbox acceleration service life test at stand more specifically to say so.
Background technology
A kind of automobile gearbox newly developed carries out durability test and examines the link that is absolutely necessary before the design typification, yet, reaching the hundreds of thousands kilometer designed life of wheeled car wheel box, durability test examination difficulty is very big, and cost is surprising.In order to reduce test period, reduce cost, to shorten the R﹠D cycle, generally adopt accelerated life test, comprise that the concentrated stress method accelerated life test and the laboratory stand on reinforcement road surface, testing field increases the stress method accelerated life test.
Accelerated life test (ALT) is an important branch of fail-test technology, the unified Definition that U.S. rom airplane exhibition center provided accelerated life test in 1967 first: accelerated life test is on the basis of carrying out reasonable engineering and statistical hypothesis, utilize the statistical model relevant that the reliability information that obtains under the acceleration environment that exceeds the normal stress level is changed, obtain test specimen a kind of test method that the reproducible numerical value of reliability characteristic is estimated under specified stress level with the physical failure rule.Accelerated life test adopts acceleration stress to carry out the durability test of test specimen, thereby has shortened test period, has improved test efficiency, has reduced experimentation cost, and its research makes the evaluation of high reliability long life reliability of products become possibility.According to the load mode of proof stress, accelerated life test is divided into constant stress test, step stress test and progress stress test usually.
External each big auto industry giant all attaches great importance to acceleration service life test method, has obtained many achievements, and the research and development level and the technical merit of product all obtain development in an all-round way.Early 1970s, the accelerated life test technology enters China, causes the extensive interest of association area, is in the state of using while studying, and is mainly used in fields such as weaponry, Aero-Space, mechano-electronic at present.
China's automobile industry has been worked out " automotive mechanical transmission bench test method QC/T568-1999 " according to the theory of acceleration service life test method, has stipulated the stand life test method of non-major-minor box structure automobile gearbox, yet right
20 tonnes of wheeled cars are shaft type fixedly The stand acceleration service life test method of major-minor box structure wheel box still belongs to blank at home.
Summary of the invention
Purpose of the present invention is just at the problems referred to above, fixedly the accelerated test loading spectrum is worked out in actual condition loaded-up condition, testing equipment situation and the testing requirements of shaft type major-minor box structure wheel box according to 20 tonnes of wheeled cars, calculate corresponding accelerator coefficient, again according to determining the stand acceleration service life test method designed life.
Test method of the present invention comprises: determine that 20 tonnes of wheeled cars respectively keep off usage ratio.Various vehicular applications differences, the gear proportional distribution is very different, and these influence the serviceable life of wheel box, also are the foundations of load distribution in the process of the test.
Determine engine normal revolution commonly used, the situation of vehicle operation under the rotating speed of maximum (top) speed and engine maximum torque point correspondence is less, and often the engine speed of work falls between.
The confirmed test tablecloth is put scheme, and the present invention utilizes two wheel box series connection to carry out life assessment test, has reduced the requirement to test bench installation.
Confirmed test standard, comprise the cycle index of test examination, in the examination cyclic process different operating points determine and each operating point examination ratio respectively.
Usefulness of the present invention: can examine product whether to meet design requirement actual life by stand accelerated life test in the laboratory, lack test period, reduce cost, shorten the R﹠D cycle.Acceleration service life test method of the present invention has not only been considered the examination under the peak torque, has also taken into account the examination at maximum power point place.20 tonnes of wheeled cars that the present invention relates to are with the method for fixed shaft type major-minor box structure wheel box stand accelerated life test, and are scientific and reasonable, and testing equipment is not had specific (special) requirements, simple.
Description of drawings
Fig. 1 major-minor box structure wheel box transmission sketch;
Fig. 2 gear usage ratio distribution diagram;
Fig. 3 testing table arrangenent diagram;
Principal character is among the figure: 1, wheel box main tank, 2, wheel box odd-side, 3, variable-frequency motor, 4, data acquisition system (DAS), 5, torque and speed sensors, 6, control desk, 7, main examination wheel box 8, electric-control system, 9, backup system, 10, accompany the examination wheel box, 11, transmission shaft, 12, torque and speed sensors, 13, dynamometer machine.
Embodiment
The major-minor case gearbox designs of the present invention's design is with reference to figure 1.For the science that guarantees wheel box stand life test method with rationally, at first the characteristics of using according to the gear quantity and the vehicle of wheel box are carried out 20 tonnes of wheeled cars and are respectively kept off the distribution of usage ratio, as shown in Figure 2.Distribution method sees Table 1.
Table 1 gear allocation proportion table
| Gear | Climb retaining | One retaining | Two retainings | Three retainings | Four retainings | Five retainings | Six retainings | Seven retainings | Eight retainings | Add up to |
| Usage ratio | ??0.1％ | ??0.2％ | ??1％ | ??1.9％ | ??2.8％ | ??6％ | ??13％ | ??25％ | ??50％ | ??100％ |
Wheel box maximum speed involved in the present invention is n
Fmax, the rotating speed of maximum torque point correspondence is n
Tmax, normal revolution is: n
c=0.85 times n
FmaxFor example: maximum speed n
Fmax=2100r/min, then normal revolution is: n
c=1785r/min.The maximum load of three rotating speed correspondences originally is not: the load Tp during maximum speed, torque capacity Tmax, load Tc under the normal revolution.
Accelerated life test testing table arrangenent diagram of the present invention is seen Fig. 3.Wheel box near variable-frequency motor 4 in the process of the test is main examination wheel box 7, and examination wheel box 10 is accompanied in another conduct.With variable-frequency motor 1 is power, and fast torque sensor 5 is switched through in motor output, connects main examination wheel box 7 input shafts then; Main examination wheel box 7 output shafts connect through transmission shaft 11 and accompany examination wheel box 10 output shafts; Accompany examination wheel box 10 input shafts to switch through fast torque sensor 12, connect dynamometer machine 13 then.
Before accelerated life test is carried out, carry out break-in, the break-in method is: remain under 80 ± 10 ℃ of situations in oily temperature, try wheel box 7 and accompany examination wheel box 10 to put identical gear main.Input speed is that the rotating speed of maximum torque point correspondence is n
Tmax± 5r/min, loading moment of torsion is 30% ± 10Nm of the maximum input torque of wheel box, according to five retainings, six retainings, seven retainings, eight retainings, four retainings, three retainings, two retainings, a retaining, the order break-in of climbing retaining, reversing gear, each keeps off half an hour working time, reverses gear, climbs retaining and move 15 minutes respectively.To load moment of torsion then and be adjusted into 50% ± 10Nm of the maximum input torque of wheel box, according to five retainings, six retainings, seven retainings, eight retainings, four retainings, three retainings, two retainings, a retaining, the order break-in of climbing retaining, reversing gear, each keeps off half an hour working time, reverses gear, climbs retaining and move 15 minutes respectively.
10 circulations are finished in accelerated life test altogether, each cycle operation 2280min.Each circulation is finished by table 2 standard.
One retaining, three kinds of operating modes of the every circulation examination of two retainings are respectively maximum speed n
FmaxOperating mode, torque capacity n
TmaxOperating mode and normal revolution n
cOperating mode, load is 85% of peak load under every kind of operating mode, and torque capacity n
TmaxUnder the operating mode running account for this retaining total run time 25%, at normal revolution n
cUnder the operating mode running account for this retaining total run time 50%, at maximum speed n
FmaxRunning accounts for 25% of this retaining total run time under the operating mode.
Nine kinds of operating modes of the every circulation examination of three retainings～eight retainings, the maximum speed n under 50% load respectively
FmaxOperating mode, torque capacity n
TmaxOperating mode and normal revolution n
cOperating mode, this operating mode running accounts for 40% of this retaining total run time, respectively the maximum speed n under 85% load
FmaxOperating mode, torque capacity n
TmaxOperating mode and normal revolution n
cOperating mode, this operating mode running accounts for 40% of this retaining total run time, respectively the maximum speed n under 100% load
FmaxOperating mode, torque capacity n
TmaxOperating mode and normal revolution n
cOperating mode, this operating mode running accounts for 20% of this retaining total run time, under every kind of operating mode, torque capacity n
TmaxUnder the operating mode running account for this retaining total run time 25%, at normal revolution n
cUnder the operating mode running account for this retaining total run time 50%, at maximum speed n
FmaxRunning accounts for 25% of this retaining total run time under the operating mode.
After finishing 10 circulations, wheel box falls, climbs the retaining examination.At input speed is the rotation speed n of maximum torque point correspondence
Tmax± 5r/min, loading moment of torsion are under 85% ± 10Nm operating mode of the maximum input torque of wheel box, and wheel box is hung respectively into reversing gear, climb retaining, and each turned round 1 hour continuously.
Table 2 wheel box stand accelerated aging certification test standard
Illustrate: t1～t8 is for each retaining usage ratio and count product single cycling time, referring to table 1.
Claims (6)
1. an automobile gearbox acceleration service life test method is characterized in that: remain under 80 ± 10 ℃ of situations in oily temperature, try wheel box and accompany the examination wheel box to put identical gear main.Input speed is that the rotating speed of maximum torque point correspondence is n
Tmax± 5r/min, loading moment of torsion is 30% ± 10Nm of the maximum input torque of wheel box, according to five retainings, six retainings, seven retainings, eight retainings, four retainings, three retainings, two retainings, a retaining, the order break-in of climbing retaining, reversing gear, each keeps off half an hour working time, reverses gear, climbs retaining and move 15 minutes respectively.To load moment of torsion then and be adjusted into 50% ± 10Nm of the maximum input torque of wheel box, according to five retainings, six retainings, seven retainings, eight retainings, four retainings, three retainings, two retainings, a retaining, the order break-in of climbing retaining, reversing gear, each keeps off half an hour working time, reverses gear, climbs retaining and move 15 minutes respectively.
2. automobile gearbox acceleration service life test method according to claim 1 is characterized in that: the wheel box maximum speed is n
Fmax, the rotating speed of maximum torque point correspondence is n
Tmax, normal revolution is: n
c=0.85 times n
Fmax
3. automobile gearbox acceleration service life test method according to claim 1, it is characterized in that: 10 circulations are finished in accelerated life test altogether, each cycle operation 2280min, wherein each retaining single cycle examination time keeps off usage ratio and counts product single cycling time for this.
4. automobile gearbox acceleration service life test method according to claim 1 is characterized in that: after finishing 10 circulations, carry out wheel box separately and fall, climb the retaining examination, input speed is the rotation speed n of maximum torque point correspondence
Tmax± 5r/min, loading moment of torsion are under 85% ± 10Nm operating mode of the maximum input torque of wheel box, and wheel box is hung respectively into reversing gear, climb retaining, and each turned round 1 hour continuously.
5. automobile gearbox acceleration service life test method according to claim 1 is characterized in that: a retaining, three kinds of operating modes of the every circulation examination of two retainings are respectively maximum speed n
FmaxOperating mode, torque capacity n
TmaxOperating mode and normal revolution n
cOperating mode, load is 85% of peak load under every kind of operating mode, and torque capacity n
TmaxUnder the operating mode running account for this retaining total run time 25%, at normal revolution n
cUnder the operating mode running account for this retaining total run time 50%, at maximum speed n
FmaxRunning accounts for 25% of this retaining total run time under the operating mode.
6. automobile gearbox acceleration service life test method according to claim 1 is characterized in that: nine kinds of operating modes of the every circulation examination of three retainings～eight retainings, the maximum speed n under 50% load respectively
FmaxOperating mode, torque capacity n
TmaxOperating mode and normal revolution n
cOperating mode, this operating mode running accounts for 40% of this retaining total run time, respectively the maximum speed n under 85% load
FmaxOperating mode, torque capacity n
TmaxOperating mode and normal revolution n
cOperating mode, this operating mode running accounts for 40% of this retaining total run time, respectively the maximum speed n under 100% load
FmaxOperating mode, torque capacity n
TmaxOperating mode and normal revolution n
cOperating mode, this operating mode running accounts for 20% of this retaining total run time, under every kind of operating mode, torque capacity n
TmaxUnder the operating mode running account for this retaining total run time 25%, at normal revolution n
cUnder the operating mode running account for this retaining total run time 50%, at maximum speed n
FmaxRunning accounts for 25% of this retaining total run time under the operating mode.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494880A (en) * | 2011-11-24 | 2012-06-13 | 北京航空航天大学 | Design method for integrated stress, acceleration and service life testing profile of astronautic drive component |
| CN102589891A (en) * | 2012-03-02 | 2012-07-18 | 北京理工大学 | Method for estimating endurance life of vehicle motor driving system |
| CN102607822A (en) * | 2011-01-25 | 2012-07-25 | 深圳万讯自控股份有限公司 | Air pressure loading valve positioner test bed |
| CN106840708A (en) * | 2017-03-27 | 2017-06-13 | 重庆理工大学 | Gear box casing deformation test method |
| CN110116615A (en) * | 2019-05-28 | 2019-08-13 | 青岛大学 | A kind of heavy type commercial automobile parallel hybrid power speed changer |
| CN116735196A (en) * | 2023-08-16 | 2023-09-12 | 盛瑞传动股份有限公司 | Gearbox reinforced load spectrum test method aiming at bearing damage |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607822A (en) * | 2011-01-25 | 2012-07-25 | 深圳万讯自控股份有限公司 | Air pressure loading valve positioner test bed |
| CN102607822B (en) * | 2011-01-25 | 2016-09-14 | 深圳万讯自控股份有限公司 | Air pressure-loading valve positioner testing stand |
| CN102494880A (en) * | 2011-11-24 | 2012-06-13 | 北京航空航天大学 | Design method for integrated stress, acceleration and service life testing profile of astronautic drive component |
| CN102494880B (en) * | 2011-11-24 | 2014-04-02 | 北京航空航天大学 | Design method for integrated stress, acceleration and service life testing profile of astronautic drive component |
| CN102589891A (en) * | 2012-03-02 | 2012-07-18 | 北京理工大学 | Method for estimating endurance life of vehicle motor driving system |
| CN102589891B (en) * | 2012-03-02 | 2013-12-18 | 北京理工大学 | Method for estimating endurance life of vehicle motor driving system |
| CN106840708A (en) * | 2017-03-27 | 2017-06-13 | 重庆理工大学 | Gear box casing deformation test method |
| CN110116615A (en) * | 2019-05-28 | 2019-08-13 | 青岛大学 | A kind of heavy type commercial automobile parallel hybrid power speed changer |
| CN110116615B (en) * | 2019-05-28 | 2023-12-29 | 青岛大学 | Parallel hybrid power transmission for heavy-duty commercial vehicle |
| CN116735196A (en) * | 2023-08-16 | 2023-09-12 | 盛瑞传动股份有限公司 | Gearbox reinforced load spectrum test method aiming at bearing damage |
| CN116735196B (en) * | 2023-08-16 | 2023-10-31 | 盛瑞传动股份有限公司 | Gearbox reinforced load spectrum test method aiming at bearing damage |
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Application publication date: 20100721 |