CN105388008A - Large-bore engine crankshaft asymmetric bending fatigue test method - Google Patents
Large-bore engine crankshaft asymmetric bending fatigue test method Download PDFInfo
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- CN105388008A CN105388008A CN201510934726.7A CN201510934726A CN105388008A CN 105388008 A CN105388008 A CN 105388008A CN 201510934726 A CN201510934726 A CN 201510934726A CN 105388008 A CN105388008 A CN 105388008A
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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 invention provides a large-bore engine crankshaft asymmetric bending fatigue test method. The method comprises the following steps: 1) obtaining the strain value at the place of the rounded corner of a connecting rod journal under a set tension and compression test load; 2) obtaining test loading load value through a calibration test; and 3) carrying out fatigue test on the tested connecting rod journal rounded corner by utilizing the obtained test loading load. Compared with the prior art, the method has the following advantages: the method can finish the asymmetric bending fatigue test of a large-bore engine crankshaft on a small/middle load test machine (<1000kN), and can improve test efficiency; and the method is convenient to operate, short in test period and low in test cost.
Description
Technical field
The invention belongs to engine crankshaft technical field of measurement and test, especially relate to a kind of large bore engine bent axle asymmetric curvature fatigue test method.
Background technology
It is one of bent axle dominant failure mode that engine crankshaft bending fatigue lost efficacy, and invalid position is generally rod journal fillet place, marks the position of 1 as shown in fig. 1.Torture test is used to the important method checking crankshaft bending fatigue intensity.
What QC/T637-2000 " automobile engine crankshaft bending fatigue testing method " adopted is resonance fatigue test method, bent axle is by symmetrical Tensile or Compressive Loading, and rod journal bears non-symmetrical load during bent axle real work, bent axle is stressed to decline with the inconsistent fatigue test results degree of confidence that will cause of virtual condition.
For improving the precision of fatigue test results, adopting the test unit shown in Fig. 2, adopting support 3 to support bent axle 2 king journal, applying asymmetric Tensile or Compressive Loading by loading head 4 pairs of rod journals.
But for large bore engine (cylinder diameter > Φ 200mm), above two kinds of methods implement all more difficult, reason is as follows: one is, because physical dimension is large, beyond the scope of application of most of crankshaft harmonics testing machine, bent axle cannot be installed; Two are, load comparatively large (>1000kN), has exceeded the load capability of most of pilot system, cannot realize on request loading.
Therefore, the torture test of large bore engine bent axle implements more difficult.Even if load on large load testing machine, because test load is large, cause that loading frequency is low, the test period is long, experimentation cost is high.
Summary of the invention
In view of this, the present invention is intended to propose a kind of large bore engine bent axle asymmetric curvature fatigue test method, can complete the asymmetric curvature torture test of large bore engine bent axle on medium and small load testing machine (<1000kN).
Invention thinking: the principle of bearing identical stress according to rod journal fillet place, mechanical model bent axle test loaded is Flexural cantilever model by free beam model conversion, i.e. stationary links axle journal, adjacent king journal applies test load.Be illustrated in figure 3 conventional rod journal fillet force analysis figure, imposed load F, rod journal fillet place bear moment of flexure be
l1 is the arm of force.If Fig. 4 is rod journal fillet force analysis figure, the imposed load F of improving one's methods, the moment of flexure at tested fillet place is F × L2, L2 is the arm of force.For the bent axle L2 ≈ 1.5L1 of most of structure, identical load, the moment of flexure adopting the rod journal fillet place that improves one's methods to bear adds about 3 times, equals the load capability improving testing machine.
Consider again the distortion of bent axle, horizontal vibration, support width be all influence factor, therefore to need on material object by the method that strain is demarcated, make the strain at rod journal fillet place and the strain facies under actual condition with, finally determine the loaded load of test.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of large bore engine bent axle asymmetric curvature fatigue test method, comprises the steps:
1) strain value at regulation tensile compression test load lower link axle journal fillet place is obtained;
2) test loaded load value is obtained by rating test;
The tested rod journal of bent axle is rotated to minimum point, support supports tested rod journal, and assist fixed crankshaft at this another support of side far-end of bent axle, loading head is applied on the adjacent main bearing journal in the other side of rod journal, main bearing journal is loaded and monitors the strain at tested rod journal fillet place, by the airborne lotus of Adjustment Tests, making the strain value at rod journal fillet place and step 1) strain value under the regulation tensile compression test load that obtains is identical, and load is now test loaded load;
3) the test loaded load obtained is used to carry out torture test to tested rod journal fillet.
Further, step 1) in following several method can be adopted to obtain strain value as test load reference-calibrating:
A, on complete machine by obtaining the stress test of bent axle, but owing to limiting by Crankshaft Sizes, structure and cost, this kind of less employing of method;
B, rod journal fillet place arrange strainometer, the support fixed crankshaft of the perch neck both sides of tested bent axle is arranged in by two, be applied on this perch neck by loading head, in test scale load limit of power, tension and compression loading is carried out to bent axle, obtain the strain variation rule at rod journal fillet place, extrapolate the strain value at regulation tensile compression test load lower link axle journal fillet place;
C, obtain strain value by simulation analysis.
Relative to prior art, the present invention has following advantage:
(1) the present invention can complete the asymmetric curvature torture test of large bore engine bent axle on medium and small load testing machine (<1000kN), and can improve test efficiency;
(2) easy to operate, the test period is short, and experimentation cost is low.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is existing rod journal invalid position mark schematic diagram;
Fig. 2 is the bent axle asymmetric curvature fatigue experimental device structural representation of existing routine;
Fig. 3 is the rod journal fillet force analysis figure of existing conventional methods;
Fig. 4 is embodiment of the present invention large bore engine bent axle asymmetric curvature fatigue test method rod journal fillet force analysis figure;
Fig. 5 is the structural representation of embodiment of the present invention large bore engine bent axle asymmetric curvature fatigue experimental device.
Description of reference numerals:
1-invalid position, 2-bent axle, 3-support, 4-loading head, 5-rod journal, 6-main bearing journal
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
A kind of large bore engine bent axle asymmetric curvature fatigue test method, comprises the steps:
1) strain at regulation tensile compression test load lower link axle journal fillet place is obtained;
Following several method specifically can be adopted to obtain strain value as test load reference-calibrating, and what the present embodiment adopted is B method:
A, on complete machine by obtaining the stress test of bent axle;
B, rod journal fillet place arrange strainometer, adopt the conventional loading method shown in Fig. 2, in test scale load limit of power, tension and compression loading is carried out to bent axle, obtain the strain variation rule at rod journal fillet place, extrapolate the strain value at regulation tensile compression test load lower link axle journal fillet place;
C, obtain strain value by simulation analysis.
2) test loaded load value is obtained by rating test;
On testing machine, adopt the test method fixed crankshaft improved, as shown in Figure 5: by two supports 3 being arranged in the side of bent axle 2, tested bent axle 2 is fixed, the tested rod journal 5 of bent axle 2 is rotated to minimum point, be applied on adjacent main bearing journal 6 by loading head 4, bent axle 2 is loaded and monitors the strain at the fillet place of rod journal 5, by the airborne lotus of Adjustment Tests, making the strain value at the fillet place of rod journal 5 and step 1) strain value under the regulation tensile compression test load that obtains is identical, and load is now test loaded load.
3) the test loaded load obtained is used to carry out torture test to tested rod journal fillet.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a large bore engine bent axle asymmetric curvature fatigue test method, is characterized in that comprising the steps:
1) strain value at regulation tensile compression test load lower link axle journal fillet place is obtained;
2) test loaded load value is obtained by rating test;
The tested rod journal of bent axle is rotated to minimum point, support supports tested rod journal, and assist fixed crankshaft at this another support of side far-end of bent axle, loading head is applied on the adjacent main bearing journal in the other side of rod journal, main bearing journal is loaded and monitors the strain at tested rod journal fillet place, by the airborne lotus of Adjustment Tests, making the strain value at rod journal fillet place and step 1) strain value under the regulation tensile compression test load that obtains is identical, and load is now test loaded load;
3) the test loaded load obtained is used to carry out torture test to tested rod journal fillet.
2. large bore engine bent axle asymmetric curvature fatigue test method according to claim 1, is characterized in that: step 1) in following several method can be adopted to obtain strain value as test load reference-calibrating:
A, on complete machine by obtaining strain value to the stress test of bent axle;
B, rod journal fillet place arrange strainometer, the support fixed crankshaft of the perch neck both sides of tested bent axle is arranged in by two, be applied on this perch neck by loading head, in test scale load limit of power, tension and compression loading is carried out to bent axle, obtain the strain variation rule at rod journal fillet place, extrapolate the strain value at regulation tensile compression test load lower link axle journal fillet place;
C, obtain strain value by simulation analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| 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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| CN105388008A true CN105388008A (en) | 2016-03-09 |
| CN105388008B CN105388008B (en) | 2018-11-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 (7)
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|---|---|---|---|---|
| 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 |
| 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 |
-
2015
- 2015-12-14 CN CN201510934726.7A patent/CN105388008B/en active Active
Patent Citations (7)
| 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 |
| 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)
| Title |
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| 谢丽颖: "汽车发动机曲轴疲劳试验方法", 《汽车工艺与材料》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN105388008B (en) | 2018-11-06 |
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