CN102353537B - Flexural fatigue testing machine for multi-throw crank shaft - Google Patents
Flexural fatigue testing machine for multi-throw crank shaft Download PDFInfo
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- CN102353537B CN102353537B CN 201110195373 CN201110195373A CN102353537B CN 102353537 B CN102353537 B CN 102353537B CN 201110195373 CN201110195373 CN 201110195373 CN 201110195373 A CN201110195373 A CN 201110195373A CN 102353537 B CN102353537 B CN 102353537B
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- crankshaft
- crank shaft
- balancing weight
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Abstract
The invention relates to a flexural fatigue testing machine for a multi-throw crank shaft, which comprises a working platform, displacement sensors, electromagnetic vibration exciters, a portal frame, counterweight blocks, a signal controlling and processing system and the like. The portal frame, a spring supporting seat and the electromagnetic vibration exciters are fixedly arranged on the working platform; the portal frame is connected with two ends of the multi-throw crank shaft through two tension springs; a main shaft in the middle section of the multi-throw crank shaft is connected with the spring supporting seat through a compression spring; each crank shaft arm of the multi-throw crank shaft is respectively and fixedly provided with a crank shaft arm clamp body; the counterweight blocks are respectively and fixedly arranged on each crank shaft arm clamp body; two electromagnetic vibration exciters are symmetrically arranged at the two ends of the multi-throw crank shaft, further, armatures of the two electromagnetic vibration exciters are fixed with two counterweight blocks at the outermost ends of the multi-throw crank shaft; the displacement sensors are fixedly arranged on the counterweight blocks; and the two electromagnetic vibration exciters and the displacement sensors are synchronously connected with the signal controlling and processing system through conducting wires. The flexural fatigue testing machine for the multi-throw crank shaft has a simple structure, convenience in operation, high precision and small error, and is applicable to the flexural fatigue testes of crank shafts of different models.
Description
Technical field
The present invention relates to a kind of bending fatigue tester for multi-throw, belong to the Crankshaft Bend Fatigue Test field.
Background technology
The safety and reliability of engineering goods is important indicators of technical merit, and the reliability in the product design life-span and Problem of Failure produce material impact in the human being's production life, therefore get more and more people's extensive concerning always.Bent axle is as crucial carrying parts of internal combustion engine, and one of main contents of its reliability are its bending fatigue problems under the high cycle fatigue effect of stress.Carrying out the technical research of mulit-turning crankshaft part reliability is significant to the engine research, development of China.Because crankshaft fatigue the complex nature of the problem, by the integrity problem of computational analysis bent axle in real work a lot of limitation are arranged also under the prior art level, it is essential with more needed data in the acquisition research to simulate its course of work by test method.The major advantage of test method is can be than the serviceable life of more comprehensive examination bent axle under certain material, structure, manufacturing process and load-up condition, and can directly obtain actual safety and the fatigue limit of bent axle.
At present, the Crankshaft Bend Fatigue Test machine system equipment during the overwhelming majority is used falls behind, and Main Problems is: the resonance frequency of work is low, causes the testing machine work efficiency low; Be and singly turn testing machine, test can only be turned successively test one by one for mulit-turning crankshaft, has both wasted the time, causes again the result of calculation distortion of whole crank shaft life-span, and take six throw crankshaft as example, whole test will continue about 40 days, and the test findings error is greater than ± 5%; Most of Crankshaft Bend Fatigue Test machine exists two end cranks can not carry out repeated bend test; The poor stability of fatigue tester system long time continuous working, for the test bent axle of different model, it is poor that the mechanical part of equipment is regulated conformability, and the resonance frequency range of adjustment is little.
Summary of the invention
The objective of the invention is in order to solve the problems such as the existing inefficiency of existing Crankshaft Bend Fatigue Test machine, the poor stability of continuous working, test findings error are large, provide a kind of energy the more than enough simultaneously bending fatigue tester for multi-throw of test, high-frequency resonant that turns.
The objective of the invention is to be achieved through the following technical solutions:
A kind of bending fatigue tester for multi-throw of the present invention comprises: worktable, displacement transducer, electromagnetic exciter, portal frame, extension spring, hook bolt, balancing weight, crank arm clamp body, diameter of axle clamp body, signal controlling and disposal system, spring supporting seat, Compress Spring;
Worktable bottom is fixed by pedestal and ground, and worktable upper surface is processed with parallel and uniform T-shaped groove, and the T-shaped groove on worktable is by T-shaped bolt respectively fixedly portal frame, spring supporting seat, two electromagnetic exciters;
On the portal frame fixing two hook bolts downwards an end of each extension spring identical with specification connect, the other end of two extension springs clamps by the two ends of diameter of axle clamp body and mulit-turning crankshaft respectively, place Compress Spring between the diameter of axle clamp body of fixing on the main shaft of mulit-turning crankshaft stage casing and the spring supporting seat, make the main shaft of the mulit-turning crankshaft after fixing parallel with the upper surface of worktable, and fixing diameter of axle clamp body and spring supporting seat is being processed with cup-shaped cavity with the Compress Spring contact position on the main shaft of stage casing;
Each crank arm difference fixed crankshaft arm clamp body at mulit-turning crankshaft, and the crank arm clamp body has the inner chamber that is complementary with tested crankshaft crooked armshaft appearance curved surface, fixed weight piece on the crank throw opposite direction of each crank arm clamp body, the resonance swing arm that balancing weight and crank arm clamp body form, by the quality that balancing weight is regulated the resonance swing arm, resonance swing arm quality and crank arm mass ratio are 2: 1～5: 1;
Two electromagnetic exciters are symmetricly set on the two ends of mulit-turning crankshaft, and two balancing weights of the armature of two electromagnetic exciters and mulit-turning crankshaft outermost end fix, two electromagnetic exciters to the mulit-turning crankshaft input with the frequently resonant excitation of homophase;
Displacement transducer is fixed on the balancing weight, displacement transducer is used for measuring the respond vibration signal of bent axle clamp body resonator system, two electromagnetic exciters, displacement transducers link to each other with disposal system with signal controlling by wire simultaneously, the vibration frequency of signal controlling and disposal system control bit displacement sensor and the vibration signal of received bit displacement sensor.
The course of work
The resonance frequency of the mulit-turning crankshaft behind at first definite fixed crankshaft arm clamp body and the balancing weight, signal controlling and disposal system are with this frequency control electromagnetic exciter excitation balancing weight, make the mulit-turning crankshaft behind fixed crankshaft arm clamp body and the balancing weight produce vibration, be fixed on sensor on the balancing weight with the vibration signal real-time Transmission to signal controlling and disposal system, until crackle occurs, stop excitation, obtain the fatigue lifetime of mulit-turning crankshaft.
Beneficial effect
The present invention is simple in structure, easy to operate, because the clamping mode that the positive camber of resonance swing arm and crank arm coincide has improved the rigidity of swing arm and bent axle joint portion greatly, improve the accuracy of Crankshaft Bend Fatigue Test, and improved significantly the resonance frequency of Crankshaft Bend Fatigue Test machine; Turn simultaneously test more and avoided singly turning the error that test produces; Each parts adopts T-shaped groove structure and workbench to fix, and position adjustments is convenient, the Crankshaft Bend Fatigue Test of applicable different model.
Description of drawings
Fig. 1 is the structural representation of bending fatigue tester for multi-throw of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is that the A-A of Fig. 1 is to cut-open view;
Fig. 4 is that the B-B of Fig. 1 is to cut-open view;
Fig. 5 is that the C-C of Fig. 1 is to cut-open view;
Wherein: the 1-worktable; The 2-displacement transducer; The 3-electromagnetic exciter; The 4-portal frame; The 5-extension spring; The 6-hook bolt; The 7-balancing weight; 8-crank arm clamp body; 9-diameter of axle clamp body; 10-signal controlling and disposal system; The 11-mulit-turning crankshaft; 12-spring supporting seat; The 13-Compress Spring; 14-T type bolt.
Embodiment
Below in conjunction with drawings and Examples content of the present invention is described further:
Embodiment
A kind of bending fatigue tester for multi-throw of the present invention, take six throw crankshaft as example, its structure as shown in Figure 1, comprise: worktable 1, displacement transducer 2, electromagnetic exciter 3, portal frame 4, extension spring 5, hook bolt 6, balancing weight 7, crank arm clamp body 8, diameter of axle clamp body 9, signal controlling and disposal system 10, spring supporting seat 12, Compress Spring 13 is characterized in that:
On the portal frame 4 fixing two hook bolts 6 downwards an end of each extension spring 5 identical with specification connect, the other end of two extension springs clamps by the two ends of diameter of axle clamp body and mulit-turning crankshaft 11 respectively, place Compress Spring 13 between the diameter of axle clamp body of fixing on the mulit-turning crankshaft 11 stage casing main shafts and the spring supporting seat 12, make the main shaft of the mulit-turning crankshaft 11 after fixing parallel with the upper surface of worktable, and fixing diameter of axle clamp body and spring supporting seat 12 is being processed with cup-shaped cavity with Compress Spring 13 contact positions on the main shaft of stage casing;
Each crank arm difference fixed crankshaft arm clamp body 8 at mulit-turning crankshaft 11, and crank arm clamp body 8 has the inner chamber that is complementary with tested crankshaft crooked armshaft appearance curved surface, fixed weight piece 7 on the crank throw opposite direction of each crank arm clamp body, the resonance swing arm that balancing weight 7 and crank arm clamp body 8 form, the quality of balancing weight quality is 4.67Kg, resonance swing arm quality is 17.15kg, and the crank arm quality is 6.14kg, and resonance swing arm quality is 2.8 times of crank arm quality;
Two electromagnetic exciters are symmetricly set on the two ends of mulit-turning crankshaft 11, and two balancing weights of the armature of two electromagnetic exciters and mulit-turning crankshaft 11 outermost end are fixed two resonant excitations that electromagnetic exciters are inputted with the frequency homophase mulit-turning crankshaft 11;
The course of work
Resonance frequency by the six throw crankshaft behind definite fixed crankshaft arm clamp body 8 and the balancing weight 7 is 146 hertz; signal controlling and disposal system 10 are with this frequency control electromagnetic exciter excitation balancing weight; load moment of flexure 2900NM; safety coefficient is 1.5; make the mulit-turning crankshaft behind fixed crankshaft arm clamp body and the balancing weight produce resonance; be fixed on sensor on the balancing weight with the vibration signal real-time Transmission to signal controlling and disposal system; until crackle occurs; system-down, the flexible life that draws this mulit-turning crankshaft is 3.6X10
5Inferior, crackle results from the 4th and turns rod journal knuckle place.
Claims (1)
1. a bending fatigue tester for multi-throw is characterized in that comprising: worktable, displacement transducer, electromagnetic exciter, portal frame, extension spring, hook bolt, balancing weight, crank arm clamp body, diameter of axle clamp body, signal controlling and disposal system, mulit-turning crankshaft, spring supporting seat, Compress Spring;
Worktable bottom is fixed by pedestal and ground, and worktable upper surface is processed with parallel and uniform T-shaped groove, and the T-shaped groove on worktable is by T-shaped bolt respectively fixedly portal frame, spring supporting seat, two electromagnetic exciters;
On the portal frame fixing two hook bolts downwards an end of each extension spring identical with specification connect, the other end of two extension springs clamps by the two ends of diameter of axle clamp body and mulit-turning crankshaft respectively, place Compress Spring between the diameter of axle clamp body of fixing on the main shaft of mulit-turning crankshaft stage casing and the spring supporting seat, make the main shaft of the mulit-turning crankshaft after fixing parallel with the upper surface of worktable, and fixing diameter of axle clamp body and spring supporting seat is being processed with cup-shaped cavity with the Compress Spring contact position on the main shaft of stage casing;
Each crank arm difference fixed crankshaft arm clamp body at mulit-turning crankshaft, and the crank arm clamp body has the inner chamber that is complementary with tested crankshaft crooked armshaft appearance curved surface, fixed weight piece on the crank throw opposite direction of each crank arm clamp body, the resonance swing arm that balancing weight and crank arm clamp body form, by the quality that balancing weight is regulated the resonance swing arm, resonance swing arm quality and crank arm mass ratio are 2:1～5:1;
Two electromagnetic exciters are symmetricly set on the two ends of mulit-turning crankshaft, and two balancing weights of the armature of two electromagnetic exciters and mulit-turning crankshaft outermost end fix, two electromagnetic exciters to the mulit-turning crankshaft input with the frequently resonant excitation of homophase;
Displacement transducer is fixed on the balancing weight, displacement transducer is used for measuring the respond vibration signal of bent axle clamp body resonator system, two electromagnetic exciters, displacement transducers link to each other with disposal system with signal controlling by wire simultaneously, the vibration frequency of signal controlling and disposal system control bit displacement sensor and the vibration signal of received bit displacement sensor;
The resonance frequency of the mulit-turning crankshaft behind at first definite fixed crankshaft arm clamp body and the balancing weight, signal controlling and disposal system are with this frequency control electromagnetic exciter excitation balancing weight, make the mulit-turning crankshaft behind fixed crankshaft arm clamp body and the balancing weight produce vibration, be fixed on sensor on the balancing weight with the vibration signal real-time Transmission to signal controlling and disposal system, until crackle occurs, stop excitation, obtain the fatigue lifetime of mulit-turning crankshaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110195373 CN102353537B (en) | 2011-07-12 | 2011-07-12 | Flexural fatigue testing machine for multi-throw crank shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110195373 CN102353537B (en) | 2011-07-12 | 2011-07-12 | Flexural fatigue testing machine for multi-throw crank shaft |
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| Publication Number | Publication Date |
|---|---|
| CN102353537A CN102353537A (en) | 2012-02-15 |
| CN102353537B true CN102353537B (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110195373 Expired - Fee Related CN102353537B (en) | 2011-07-12 | 2011-07-12 | Flexural fatigue testing machine for multi-throw crank shaft |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777169B (en) * | 2015-03-12 | 2018-08-28 | 中国人民解放军装甲兵工程学院 | Bent axle remanufactures life appraisal test method |
| CN105388008B (en) * | 2015-12-14 | 2018-11-06 | 中国北方发动机研究所(天津) | A kind of large bore engine bent axle asymmetric curvature fatigue test method |
| CN105372067B (en) * | 2015-12-28 | 2016-08-17 | 中北大学 | Crankshaft torsion fatigue experimental device |
| CN105372066B (en) * | 2015-12-28 | 2016-12-07 | 中北大学 | A kind of torsion fatigue test of whole crank shaft method |
| CN107152987A (en) * | 2017-05-06 | 2017-09-12 | 浙江金兰汽车零部件有限公司 | Crankshaft dynamic balance block erecting bed |
| CN114235417A (en) * | 2021-12-07 | 2022-03-25 | 北京理工大学 | Expandable crankshaft system simulation device of internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598528A (en) * | 2004-09-06 | 2005-03-23 | 浙江大学 | Crankshaft bend fatigue test system and method |
| CN1719227A (en) * | 2005-07-08 | 2006-01-11 | 天津大学 | Adaptive resonant type crank bending fatigue experimental machine |
| KR20090050855A (en) * | 2007-11-16 | 2009-05-20 | 현대자동차주식회사 | Engine crankshaft fatigue limit stress determination method |
| CN201555782U (en) * | 2009-07-03 | 2010-08-18 | 中国第一汽车集团公司 | Crankshaft fatigue torsion testing device |
| JP4618173B2 (en) * | 2006-03-15 | 2011-01-26 | 三菱自動車工業株式会社 | Torsional torque testing machine |
-
2011
- 2011-07-12 CN CN 201110195373 patent/CN102353537B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598528A (en) * | 2004-09-06 | 2005-03-23 | 浙江大学 | Crankshaft bend fatigue test system and method |
| CN1719227A (en) * | 2005-07-08 | 2006-01-11 | 天津大学 | Adaptive resonant type crank bending fatigue experimental machine |
| JP4618173B2 (en) * | 2006-03-15 | 2011-01-26 | 三菱自動車工業株式会社 | Torsional torque testing machine |
| KR20090050855A (en) * | 2007-11-16 | 2009-05-20 | 현대자동차주식회사 | Engine crankshaft fatigue limit stress determination method |
| CN201555782U (en) * | 2009-07-03 | 2010-08-18 | 中国第一汽车集团公司 | Crankshaft fatigue torsion testing device |
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| CN102353537A (en) | 2012-02-15 |
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