CN105388008B - A kind of large bore engine bent axle asymmetric curvature fatigue test method - Google Patents
A kind of large bore engine bent axle asymmetric curvature fatigue test method Download PDFInfo
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- CN105388008B CN105388008B CN201510934726.7A CN201510934726A CN105388008B CN 105388008 B CN105388008 B CN 105388008B CN 201510934726 A CN201510934726 A CN 201510934726A CN 105388008 B CN105388008 B CN 105388008B
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The present invention provides a kind of large bore engine bent axle asymmetric curvature fatigue test methods, include the following steps：1) strain value at regulation tensile compression test load lower link axle journal fillet is obtained；2) experiment loaded load value is obtained by rating test；3) fatigue test is carried out to the rod journal fillet of subject using obtained experiment loaded load.Compared with the existing technology, the present invention has the advantage that：The present invention can medium and small load testing machine (<The asymmetric curvature fatigue test of large bore engine bent axle is completed on 1000kN), and can improve test efficiency；Easy to operate, the test period is short, and experimentation cost is low.
Description
Technical field
The invention belongs to engine crankshaft technical field of measurement and test, asymmetric more particularly, to a kind of large bore engine bent axle
Bending fatigue testing method.
Background technology
The failure of engine crankshaft flexural fatigue is one of bent axle dominant failure mode, and invalid position is generally crankshaft connecting rod axle
At neck fillet, the position of label 1 as shown in fig. 1.Fatigue test is the important method for examining crankshaft bending fatigue intensity.
QC/T 637-2000《Automobile engine crankshaft bending fatigue testing method》Using resonance fatigue test side
Method, bent axle is by symmetrical Tensile or Compressive Loading, and rod journal bears non-symmetrical load, bent axle stress and practical shape to bent axle in actual work
State is inconsistent will to cause fatigue test results confidence level to decline.
To improve the precision of fatigue test results, using experimental rig shown in Fig. 2,2 main shaft of bent axle is supported using holder 3
Neck applies asymmetric Tensile or Compressive Loading by loading head 4 to rod journal.
But for large bore engine (cylinder diameter > Φ 200mm), both the above method implement it is all relatively difficult,
Reason is as follows：First, since structure size is big, the scope of application of most of crankshaft harmonics testing machine is had exceeded, bent axle can not pacify
Dress；Second is that load is larger (> 1000kN), it has been more than the load capability of most of pilot system, can not have realized load as required.
Therefore, the fatigue test of large bore engine bent axle implements relatively difficult.Even if on big load testing machine
It is loaded, since test load is big, leads to that loading frequency is low, the test period is long, experimentation cost is high.
Invention content
In view of this, the present invention is directed to propose a kind of large bore engine bent axle asymmetric curvature fatigue test method, with
Can medium and small load testing machine (<The asymmetric curvature fatigue test of large bore engine bent axle is completed on 1000kN).
Invention thinking：According to the principle for bearing identical stress at rod journal fillet, by the power of bent axle experiment load
It is Flexural cantilever model that model, which is learned, by simply supported beam model conversion, i.e., fixed rod journal, and applying experiment on adjacent trunnion carries
Lotus.It is illustrated in figure 3 conventional rod journal fillet force analysis figure, applies load F, is born at rod journal fillet curved
Square isL1 is the arm of force.If Fig. 4 is improved method rod journal fillet force analysis figure, applies load F, be tested fillet
The moment of flexure at place is F × L2, and L2 is the arm of force.For the bent axle L2 ≈ 1.5L1 of most table structure, identical load, using improvement side
The moment of flexure born at method rod journal fillet increases 3 times or so, equal to the load capability for improving testing machine.
Consider further that the deforming of bent axle, lateral vibration, holder width be all influence factor, it is therefore desirable to lead on material object
The method of overstrain calibration, keeps the strain at rod journal fillet and the strain facies under actual condition same, final determining experiment
Loaded load.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of large bore engine bent axle asymmetric curvature fatigue test method, includes the following steps：
1) strain value at regulation tensile compression test load lower link axle journal fillet is obtained；
2) experiment loaded load value is obtained by rating test；
The subject rod journal of bent axle is rotated to minimum point, holder support subject rod journal, and the side is remote in bent axle
Bent axle is auxiliarily fixed with another holder in end, and loading head is applied on the adjacent main bearing journal of rod journal other side, right
Main bearing journal is loaded and the strain monitored at subject rod journal fillet makes pitman shaft by adjusting test scale load
Strain value at neck fillet is identical as the strain value under the regulation tensile compression test load that step 1) obtains, and load at this time is experiment
Loaded load；
3) fatigue test is carried out to the rod journal fillet of subject using obtained experiment loaded load.
Further, following several method can be used in step 1) and obtain strain value as test load reference-calibrating：
A, it is obtained by the stress test to bent axle in complete machine, but due to being limited by Crankshaft Sizes, structure and cost, this
The kind less use of method；
B, strain gauge is arranged at rod journal fillet, the perch for being arranged in subject bent axle by two
The holder fixed crankshaft of neck both sides is applied to by loading head on the perch neck, right in test scale load limit of power
Bent axle carries out tension and compression load, obtains the strain variation rule at rod journal fillet, extrapolates under regulation tensile compression test load
Strain value at rod journal fillet；
C, strain value is obtained by simulation analysis.
Compared with the existing technology, the present invention has the advantage that：
(1) present invention can medium and small load testing machine (<The asymmetric of large bore engine bent axle is completed on 1000kN)
Repeated bend test, and test efficiency can be improved；
(2) easy to operate, the test period is short, and experimentation cost is low.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is that existing rod journal invalid position marks schematic diagram；
Fig. 2 is existing conventional bent axle asymmetric curvature fatigue experimental device structural schematic diagram；
Fig. 3 is the rod journal fillet force analysis figure of existing conventional methods；
Fig. 4 be large bore engine of embodiment of the present invention bent axle asymmetric curvature fatigue test method rod journal fillet by
Power analysis chart；
Fig. 5 is the structural schematic diagram of large bore engine bent axle asymmetric curvature fatigue experimental device of the embodiment of the present invention.
Reference sign：
1- invalid positions, 2- bent axles, 3- holders, 4- loading heads, 5- rod journals, 6- main bearing journals
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of large bore engine bent axle asymmetric curvature fatigue test method, includes the following steps：
1) strain at regulation tensile compression test load lower link axle journal fillet is obtained；
Following several method specifically can be used and obtain strain value as test load reference-calibrating, the present embodiment using
B methods：
A, it is obtained by the stress test to bent axle in complete machine；
B, strain gauge is arranged at rod journal fillet, it is airborne testing using conventional loading method shown in Fig. 2
Tension and compression load is carried out to bent axle in lotus limit of power, the strain variation rule at rod journal fillet is obtained, extrapolates and providing
Strain value at tensile compression test load lower link axle journal fillet；
C, strain value is obtained by simulation analysis.
2) experiment loaded load value is obtained by rating test；
On testing machine, using improved test method fixed crankshaft, as shown in Figure 5：By the side for being arranged in bent axle 2
Two holders 3 fixed bent axle 2 is tested, the subject rod journal 5 of bent axle 2 is rotated to minimum point, is applied by loading head 4
On adjacent main bearing journal 6, the strain at the fillet of rod journal 5 is loaded and monitored to bent axle 2, passes through tune
Whole test scale load makes answering under the regulation tensile compression test load that the strain value at the fillet of rod journal 5 obtains with step 1)
Variate is identical, and load at this time is experiment loaded load.
3) fatigue test is carried out to the rod journal fillet of subject using obtained experiment loaded load.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (2)
1. a kind of large bore engine bent axle asymmetric curvature fatigue test method, it is characterised in that include the following steps：
1) strain value being tested in the case where providing tensile compression test load at rod journal fillet is obtained；
2) experiment loaded load value is obtained by rating test；
Subject rod journal is rotated to minimum point, holder support subject rod journal, and far from subject pitman shaft on bent axle
Bent axle is auxiliarily fixed with another holder in one end of neck, and loading head is applied on the adjacent main bearing journal of subject rod journal,
Main bearing journal is loaded and the strain monitored at subject rod journal fillet makes subject by adjusting test scale load
Strain value at rod journal fillet is identical as the strain value under the regulation tensile compression test load that step 1) obtains, load at this time
To test loaded load；
3) fatigue test is carried out to subject rod journal fillet using obtained experiment loaded load.
2. large bore engine bent axle asymmetric curvature fatigue test method according to claim 1, it is characterised in that：Step
It is rapid 1) in following several method can be used obtain strain value as test load reference-calibrating：
A, strain value is obtained by the stress test to bent axle in complete machine；
B, it arranges strain gauge at bent axle subject rod journal fillet, subject rod journal both sides is arranged in by two
Holder fixed crankshaft applies load on the subject rod journal, to song in test scale load limit of power by loading head
Axis carries out tension and compression load, obtains the strain variation rule at subject rod journal fillet, extrapolates in regulation tensile compression test load
Strain value at lower subject rod journal fillet；
C, strain value is obtained by simulation analysis.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510934726.7A CN105388008B (en) | 2015-12-14 | 2015-12-14 | A kind of large bore engine bent axle asymmetric curvature fatigue test method |
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| CN201510934726.7A CN105388008B (en) | 2015-12-14 | 2015-12-14 | A kind of large bore engine bent axle asymmetric curvature fatigue test method |
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| CN105388008A CN105388008A (en) | 2016-03-09 |
| CN105388008B true CN105388008B (en) | 2018-11-06 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106649990A (en) * | 2016-11-16 | 2017-05-10 | 中国北方发动机研究所(天津) | Engine main connecting rod load simplifying method applied to rapid fatigue test |
Citations (5)
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| CN102353537A (en) * | 2011-07-12 | 2012-02-15 | 北京理工大学 | Flexural fatigue testing machine for multi-throw crank shaft |
| CN103162965A (en) * | 2013-03-22 | 2013-06-19 | 潍柴动力股份有限公司 | Engine body fatigue test device of diesel engine |
| CN104006967A (en) * | 2014-05-29 | 2014-08-27 | 潍柴动力股份有限公司 | Connecting rod fatigue testing device |
| CN104101534A (en) * | 2014-07-16 | 2014-10-15 | 上汽通用五菱汽车股份有限公司 | Engine crankshaft fatigue test fixture |
| CN104515674A (en) * | 2014-11-26 | 2015-04-15 | 中国北方发动机研究所(天津) | Hydraulic loading tester for testing engine crankshaft fatigue |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5770428A (en) * | 1980-10-20 | 1982-04-30 | Kubota Ltd | Equipment for fatigue test of crank-shaft of engine |
| KR20090050855A (en) * | 2007-11-16 | 2009-05-20 | 현대자동차주식회사 | Engine crankshaft fatigue limit stress determination method |
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2015
- 2015-12-14 CN CN201510934726.7A patent/CN105388008B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353537A (en) * | 2011-07-12 | 2012-02-15 | 北京理工大学 | Flexural fatigue testing machine for multi-throw crank shaft |
| CN103162965A (en) * | 2013-03-22 | 2013-06-19 | 潍柴动力股份有限公司 | Engine body fatigue test device of diesel engine |
| CN104006967A (en) * | 2014-05-29 | 2014-08-27 | 潍柴动力股份有限公司 | Connecting rod fatigue testing device |
| CN104101534A (en) * | 2014-07-16 | 2014-10-15 | 上汽通用五菱汽车股份有限公司 | Engine crankshaft fatigue test fixture |
| CN104515674A (en) * | 2014-11-26 | 2015-04-15 | 中国北方发动机研究所(天津) | Hydraulic loading tester for testing engine crankshaft fatigue |
Non-Patent Citations (1)
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| 汽车发动机曲轴疲劳试验方法;谢丽颖;《汽车工艺与材料》;20060331(第03期);第2.2节 * |
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