CN105372067B - Crankshaft torsion fatigue experimental device - Google Patents
Crankshaft torsion fatigue experimental device Download PDFInfo
- Publication number
- CN105372067B CN105372067B CN201510995471.5A CN201510995471A CN105372067B CN 105372067 B CN105372067 B CN 105372067B CN 201510995471 A CN201510995471 A CN 201510995471A CN 105372067 B CN105372067 B CN 105372067B
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- CN
- China
- Prior art keywords
- swing arm
- crankshaft
- resonance
- branch sleeve
- bent axle
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- G—PHYSICS
- 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
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The present invention relates to a kind of crankshaft torsion fatigue experimental device, it includes pedestal, electromagnetic exciter, portal frame, swing arm, branch sleeve, balancing weight, acceleration transducer, control chamber etc., test bent axle is connected with the swing arm on both sides by branch sleeve, two swing arms are connected with the boatswain chair being placed on portal frame by slinky spring rope, and the most whole crankshaft system is just suspended；It is equipped with balancing weight on the both sides of each swing arm, electromagnetic exciter is arranged on the lower end of a side of left side swing arm, acceleration transducer is fixed on the lower end of another side of the right swing arm, electromagnetic exciter and acceleration transducer and is connected with control chamber (signal controls and processing system) by wire.Present configuration is simple and convenient to operate, and accuracy is high, and error is little, it is adaptable to the crankshaft torsion fatigue test of different model.
Description
Technical field
The present invention relates to a kind of crankshaft torsion fatigue experimental device, belong to crankshaft torsion fatigue test field.
Background technology
Along with electromotor develops towards high speed, direction light-duty, high-power, more and more higher to the requirement of strength of its parts.Bent axle is one of part that in electromotor, stress is the most serious, it bears the effect of periodically variable gas pressure and reciprocal inertia force, produce the biggest vertiginous alternating bending and distorting stress the most therein, and the complex geometry of bent axle own, changes of section is very big, and stress concentration phenomenon is serious, and the particularly stress concentration phenomenon bent axle master, the round-corner transition part of rod journal is especially prominent, the inefficacy of electromotor, predominantly fatigue fracture and journal wear.For the engine crankshaft below triplex, its strength problem is based on flexural fatigue, but along with the increase of cylinder number, the torsional oscillation of bent axle tends to serious, and torsional fatigue rises to the subject matter of crankshaft strength.Owing to causing the many factors of crankshaft torsional vibrations, although some empirical equation or finite element, the method such as photoelastic can be utilized to estimate, but to make an appraisal exactly, the most reliably approach of practicality or object fatigue test, crankshaft torsion fatigue test is the important means to the detection of bent axle functional reliability.
At present, at home, the crankshaft torsion fatigue machine system equipment in most application falls behind, the subject matter existed is: a lot of still for singly turning testing machine, can only turn one by one for the test of whole bent axle and test successively, both waste the time, made again bent axle bulk life time calculated distortion；The resonant frequency of work is low, causes testing machine inefficiency；The poor stability of fatigue machine long time continuous working, testing bent axle or partly cannot be carried out the bent axle of test because vibration shape frequency is close for different model, the mechanical part regulation bad adaptability of equipment, adjustable resonant frequency range is little.
Summary of the invention
The technical problem to be solved is to overcome above-mentioned the deficiencies in the prior art, there is provided that a kind of power consumption is little, the good stability of continuous work, test error is relatively small, can carry out frequency regulation and whole bent axle can carry out the reverse torsion machine of high-frequency resonant of torsional fatigue test in relatively large scope；And present configuration is reasonable, is simple to manufacture, it is easy to clamping and dismounting, easy to operate, work efficiency is high.
The present invention is solved above-mentioned technical problem is that and is realized by below scheme:
A kind of crankshaft torsion fatigue experimental device of the present invention, comprising: pedestal, electromagnetic exciter, portal frame, swing arm, branch sleeve, balancing weight, acceleration transducer, control chamber, it is characterized in that: test bent axle is connected with the swing arm on both sides by branch sleeve, two swing arms are connected with the boatswain chair being placed on portal frame by slinky spring rope, and the most whole crankshaft system is just suspended；It is equipped with balancing weight on the both sides of each swing arm, it and swing arm main body are connected to form resonance swing arm by attachment screw, resonance swing arm and bent axle, branch sleeve composition crankshaft harmonics system, the quality of resonance swing arm is regulated by balancing weight, and then can regulate the natural frequency of crankshaft harmonics system.
Electromagnetic exciter is fixed on pedestal, and by push rod, exciting force is acted on the lower end of a side of left side resonance swing arm, acceleration transducer is fixed on the lower end of another side of the right resonance swing arm, for measuring the response vibration signal of crankshaft harmonics system, vibrator is connected with control chamber by wire with acceleration transducer.
The internal diameter of branch sleeve of the present invention is consistent with the trunnion diameter of bent axle, the two tight fit connection, and the external diameter of branch sleeve all carries tapered with the through hole in swing arm.
It is additionally provided with trip bolt between branch sleeve end face of the present invention and swing arm inner surface.Fix branch sleeve by screwing trip bolt, bent axle can be securely fixed in swing arm.
Crankshaft torsion fatigue experimental device of the present invention, work process:
First the resonant frequency of crankshaft harmonics system is determined, electromagnetic exciter carries out exciting with this frequency and certain amplitude, by push rod, exciting force is delivered in the resonance swing arm on the left side, moment of torsion produced by the inertia force of resonance swing arm is applied on bent axle, the resonance swing arm on the right is vibrated therewith, whole crankshaft harmonics system is made to produce twisting vibration, crankshaft harmonics system, vibrator, acceleration transducer and control chamber composition close loop control circuit, when the resonant frequency of crankshaft harmonics system changes because of crankshaft crack cause, the frequency of loop energy revision directive signal automatically, the resonant frequency being allowed to current with crankshaft harmonics system is equal, guarantee that system is in resonance state all the time, when the resonant frequency of system drops to predetermined value, during i.e. corresponding with a certain crack length value, stop excitation, obtain the life-span of this bent axle.
Beneficial effect
Present invention employs the clamping mode that resonance swing arm is fixing with the trunnion of bent axle, improve the rotational-torsional inertia of whole resonator system, thus improve the resonant frequency of crankshaft torsion fatigue experimental device, shorten test period, improve the work efficiency of testing machine；Owing to balancing weight quality is adjustable, so frequency regulation can be carried out in relatively large scope, thus the bent axle that cannot be carried out testing because vibration shape frequency is close to part can be carried out torsional fatigue test；Crankshaft two end uses the mode of branch sleeve to fix, and when changing the bent axle of different model, only need to change the sleeve of different inner diameters, and other device is constant, it is adaptable to the Crankshaft Bend Fatigue Test of different model；And present configuration is reasonable, is simple to manufacture, it is easy to clamping and dismounting, easy to operate, work efficiency is high, continuously the good stability of work, and test error is relatively small.
Accompanying drawing explanation
The present invention will be further described below in conjunction with the accompanying drawings
Fig. 1 is the main TV structure schematic diagram of crankshaft torsion fatigue experimental device of the present invention；
Fig. 2 be the A-A of Fig. 1 cut open to schematic diagram；
Fig. 3 is the close-up schematic view of Fig. 1；
Fig. 4 is the left view structural representation of branch sleeve of the present invention；
In figure: 1-pedestal 2-T type bolt 3-electromagnetic exciter 4-portal frame 5-swing arm 6-trip bolt 7-bent axle 8-branch sleeve 9-bolt 10-boatswain chair 11-attachment screw 12-acceleration transducer 13-control chamber 14-balancing weight 15-push rod.
Detailed description of the invention
It can be seen that a kind of crankshaft torsion fatigue experimental device from Fig. 1, Fig. 2, Fig. 3, Fig. 4, comprising: pedestal 1, electromagnetic exciter 3, portal frame 4, swing arm 5, branch sleeve 8, balancing weight 14, acceleration transducer 12, control chamber 13, it is characterised in that:
Described test bent axle 7 is connected with the swing arm 5 on both sides by branch sleeve 8, two swing arms 5 are connected with the boatswain chair 10 being placed on portal frame 4 by slinky spring rope, the most whole crankshaft system is just suspended, during installation, the first trunnion of crankshaft two end is connected with branch sleeve 8 interference fit forms a whole, owing to the external diameter of branch sleeve 8 all carries tapered with the through hole in swing arm, again the external diameter of the branch sleeve 8 equipped with bent axle and the bellmouth tight fit connection in swing arm, then together with being securely attached to swing arm 5 with 6 branch sleeves 8 of trip bolt, so, bent axle, branch sleeve, swing arm just one crankshaft system of composition, finally with slinky spring rope, this crankshaft system is connected with boatswain chair 10, boatswain chair 10 bolt 9 is fixed on portal frame 4 upper end.When testing the bent axle of different model, only need to change the branch sleeve of different inner diameters, remaining device is all without change.
The both sides of each swing arm 5 are equipped with balancing weight 14, and it and swing arm main body are connected to form resonance swing arm by attachment screw 11, and the quality of resonance swing arm is regulated by balancing weight, and then can regulate the natural frequency of crankshaft harmonics system.
Electromagnetic exciter 3 is fixed on pedestal 1, and by push rod 15, exciting force is acted on the lower end of a side of left side resonance swing arm, acceleration transducer 12 is fixed on the lower end of another side of the right resonance swing arm, for measuring the response vibration signal of crankshaft harmonics system, vibrator 3 is connected with control chamber 13 by wire with acceleration transducer 12.
Work process:
nullFirst the resonant frequency of crankshaft harmonics system is determined，Electromagnetic exciter 3 carries out exciting with this frequency and certain amplitude，It is delivered in the resonance swing arm on the left side by 15 exciting forces of push rod，Moment of torsion produced by the inertia force of resonance swing arm is applied on bent axle 7，The resonance swing arm on the right is vibrated therewith，Whole crankshaft harmonics system is made to produce twisting vibration，Crankshaft harmonics system、Vibrator 3、Acceleration transducer 12 and control chamber 13 form close loop control circuit，When the resonant frequency of crankshaft harmonics system changes because of crankshaft crack cause，The frequency of loop energy revision directive signal automatically，The resonant frequency being allowed to current with crankshaft harmonics system is equal，Guarantee that system is in resonance state all the time，When the resonant frequency of system drops to predetermined value，During i.e. corresponding with a certain crack length value，Stop excitation，Obtain the life-span of this bent axle.
Claims (1)
1. a crankshaft torsion fatigue experimental device, comprising: pedestal, electromagnetic exciter, portal frame, swing arm, branch sleeve, balancing weight, acceleration transducer, control chamber, it is characterised in that:
Test bent axle is connected with the swing arm on both sides by branch sleeve, and two swing arms are connected with the boatswain chair being placed on portal frame by slinky spring rope, and the most whole crankshaft system is just suspended；
It is equipped with balancing weight on the both sides of each swing arm, it and swing arm main body are connected to form resonance swing arm by attachment screw, resonance swing arm and bent axle, branch sleeve composition crankshaft harmonics system, the quality of resonance swing arm is regulated by balancing weight, and then can regulate the natural frequency of crankshaft harmonics system；
Electromagnetic exciter is fixed on pedestal, and by push rod, exciting force is acted on the lower end of a side of left side resonance swing arm, acceleration transducer is fixed on the lower end of another side of the right resonance swing arm, for measuring the response vibration signal of crankshaft harmonics system, vibrator is connected with control chamber by wire with acceleration transducer；
The internal diameter of described branch sleeve is consistent with the trunnion diameter of bent axle, the two tight fit connection, and the external diameter of branch sleeve all carries tapered with the through hole in swing arm；
It is additionally provided with trip bolt between described branch sleeve end face and swing arm inner surface；
Work process:
First the resonant frequency of crankshaft harmonics system is determined, electromagnetic exciter carries out exciting with this frequency and certain amplitude, by push rod, exciting force is delivered in the resonance swing arm on the left side, moment of torsion produced by the inertia force of resonance swing arm is applied on bent axle, the resonance swing arm on the right is vibrated therewith, whole crankshaft harmonics system is made to produce twisting vibration, crankshaft harmonics system, vibrator, acceleration transducer and control chamber composition close loop control circuit, when the resonant frequency of crankshaft harmonics system changes because of crankshaft crack cause, the frequency of loop energy revision directive signal automatically, the resonant frequency being allowed to current with crankshaft harmonics system is equal, guarantee that system is in resonance state all the time, when the resonant frequency of system drops to predetermined value, during i.e. corresponding with a certain crack length value, stop excitation, obtain the life-span of this bent axle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510995471.5A CN105372067B (en) | 2015-12-28 | 2015-12-28 | Crankshaft torsion fatigue experimental device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510995471.5A CN105372067B (en) | 2015-12-28 | 2015-12-28 | Crankshaft torsion fatigue experimental device |
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| Publication Number | Publication Date |
|---|---|
| CN105372067A CN105372067A (en) | 2016-03-02 |
| CN105372067B true CN105372067B (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510995471.5A Expired - Fee Related CN105372067B (en) | 2015-12-28 | 2015-12-28 | Crankshaft torsion fatigue experimental device |
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| CN (1) | CN105372067B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107727390B (en) * | 2017-08-21 | 2019-07-16 | 江铃汽车股份有限公司 | Automobile power-transmission system flexural property test method |
| CN109975134A (en) * | 2019-04-02 | 2019-07-05 | 北京理工大学 | A kind of torsional fatigue damage check test platform |
| CN112284660B (en) * | 2020-09-28 | 2022-05-03 | 浙江大学 | Bent torsion composite load test device of bent axle |
| CN112880992B (en) * | 2021-01-15 | 2022-06-07 | 一汽解放汽车有限公司 | System and method for crankshaft bending and twisting fatigue test |
| CN112729818B (en) * | 2021-02-04 | 2022-03-15 | 北京理工大学 | Testing device and method for torsional vibration modal test of gear box |
| CN114577468B (en) * | 2022-03-03 | 2023-08-18 | 潍柴动力股份有限公司 | Method and system for detecting failure of elastic coupling under dynamic cylinder breaking of engine |
| CN114674548B (en) * | 2022-05-30 | 2022-08-26 | 中国飞机强度研究所 | Local vibration load applying system for airplane fatigue strength test and design method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288406A (en) * | 2011-07-08 | 2011-12-21 | 天润曲轴股份有限公司 | Clamping vibration exciting device for integral torsion fatigue test of crankshaft |
| CN102353537A (en) * | 2011-07-12 | 2012-02-15 | 北京理工大学 | Flexural fatigue testing machine for multi-throw crank shaft |
| CN103954498A (en) * | 2014-05-23 | 2014-07-30 | 天润曲轴股份有限公司 | Clamping device for bent axle fatigue test |
| CN204575309U (en) * | 2015-04-18 | 2015-08-19 | 长春机械科学研究院有限公司 | A kind of Large Crankshaft bending fatigue testing device |
-
2015
- 2015-12-28 CN CN201510995471.5A patent/CN105372067B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288406A (en) * | 2011-07-08 | 2011-12-21 | 天润曲轴股份有限公司 | Clamping vibration exciting device for integral torsion fatigue test of crankshaft |
| CN102353537A (en) * | 2011-07-12 | 2012-02-15 | 北京理工大学 | Flexural fatigue testing machine for multi-throw crank shaft |
| CN103954498A (en) * | 2014-05-23 | 2014-07-30 | 天润曲轴股份有限公司 | Clamping device for bent axle fatigue test |
| CN204575309U (en) * | 2015-04-18 | 2015-08-19 | 长春机械科学研究院有限公司 | A kind of Large Crankshaft bending fatigue testing device |
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| CN105372067A (en) | 2016-03-02 |
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Granted publication date: 20160817 Termination date: 20181228 |