CN103868633B - Engine overhead air distribution camshaft contact stress method of testing - Google Patents
Engine overhead air distribution camshaft contact stress method of testing Download PDFInfo
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- CN103868633B CN103868633B CN201410110600.3A CN201410110600A CN103868633B CN 103868633 B CN103868633 B CN 103868633B CN 201410110600 A CN201410110600 A CN 201410110600A CN 103868633 B CN103868633 B CN 103868633B
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Abstract
The present invention relates to a kind of engine overhead air distribution camshaft contact stress method of testing, comprise the following steps: determine by emulation mode the camshaft degree that work period cam ring-driven member Max.contact stress is corresponding; By the crankshaft fillets stress under bench test dynamic test cam Max.contact stress corner; Then determine the linear relationship of cam-follower contact force and cam root fillet stress, then can convert obtains the maximum unilateral force of cam-follower; Final solving according to hertz formula obtains contact stress.This method can realize the camshaft contact stress test of any valve actuating mechanism pattern comprising overhead type, and test data is with a high credibility.
Description
Technical field
The invention belongs to Engine Block Test technical field, be specifically related to a kind of engine overhead air distribution camshaft contact stress method of testing.
Background technology
Camshaft is the core part of engine valve actuating mechanism transmission component, and for ensureing mechanism's power transmission rigidity, the design margin of camshaft intensity is general comparatively large, and fatigue failure of rupturing seldom occurs camshaft under normal circumstances.On the contrary, the wear failure problem of cam and its driven member is comparatively common, and the parts of cam Direct driver are referred to as cam follower, generally refers to rocking arm, swing arm or tappet.Particularly along with the appearance of high power density engine, this friction pair, under the effect of high temperature, high rotating speed, pressure changeable, easily causes cam-follower workplace to wear and tear because there is severe friction.Research and solution cam contact fatigue problem wherein a most important evaluating are exactly contact stress, but the difficulty of test of contact stress is very large.Therefore, accurately test cam of camshaft contact stress value, in order to solve cam wear problem and fatigue study is very important.
At present, about the acquisition methods mainly simulation calculation of camshaft contact stress, general utilization AVL dynamics calculation module, by building model, parameters input, cam cycle contact stress curve can be obtained simply, but because mechanism is that simplified model, lubrication and friction parameter quantize difficulty, still there is certain error in the stress value that simulation calculation obtains and actual stress value.Experimental test is the acquisition methods of another one contact stress, and it mainly comprises two kinds of thinkings: one adopts the special strainometers such as thin film strain meter or directly tested by face pressure test paper to obtain; Another kind first solves contact force by the stress of mechanism for testing correlated parts, and recycling hertz formula calculates and indirectly obtains.Special strainometer technology maturity, reliability are lower, and testing range is limited, apply in the industry less; Although by testing the method for indirectly testing, degree of recognition is higher in the industry, but, its application can only be confined to mid-or underlying the pushing away of camshaft and very shake formula valve actuating mechanism, using value is had no for air dispensing machine for top-set camshaft pattern, because be difficult to find the correlated parts that can be solved cam contact power by test stress.
Application number is the method for testing that application discloses a kind of contact stress of cam driving mechanism of diesel fuel system of 200810044029.4, adopt the mode that dynamic test and static test combine, the contact stress of cam driving mechanism of diesel fuel system cam and tappet is tested: the first dynamic strain value of tappet under surveying work state, then calculates the amount of force suffered by tappet; According to the angle of cam when being subject to maximum unilateral force effect between cam contact power and tappet axial force, the axial force be subject to by tappet is converted into the contact force between cam and roller; Last pressing on testing machine demarcates load loading, measures the contact region area between cam and roller, calculates its mean exposure stress.The contact stress that the method can accurately be surveyed, carries out strength assessment to cam drive mechanism, instructs the structural design of cam and tappet, also can differentiate the result of simulation analysis simultaneously, instruct simulation analysis.
In prior art, the indirect test method of contact stress only can very shake formula valve actuating mechanism for mid-or underlying pushing away, select to arrange foil gauge at pusher table face axial direction, obtain the bearing load of push rod, and then conversion obtains the contact force of cam-tappet, after utilize hertz formula to complete contact stress to solve, therefore, the contact stress test of air dispensing machine for top-set camshaft pattern cannot be realized.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of engine overhead air distribution camshaft contact stress method of testing, the test of any valve actuating mechanism pattern camshaft contact stress can be realized.
Technical scheme of the present invention: a kind of engine overhead air distribution camshaft contact stress method of testing, is characterized in that:
The first step, camshaft degree corresponding when determining work period cam ring-driven member Max.contact stress by AVL dynamics calculation module;
Second step, the cam root fillet stress that dynamic test cam-follower Max.contact stress corner is corresponding on valve actuating mechanism test-bed;
3rd step, takes out and stationary cam axle, adopt hydraulic pressure, etc. the nonstandard driven member pressure head of shape locate to carry with camshaft and contact, determine the linear relationship of cam-follower contact force and cam root fillet stress;
4th step, the linear relationship between the cam-follower contact force that the cam root fillet stress determined according to second step and the 3rd step are determined and cam root fillet stress, determines the maximum unilateral force of cam-follower;
5th step, according to hertz formula determination contact stress.
The present invention compared with prior art has following beneficial effect:
1. can realize the test of any valve actuating mechanism pattern camshaft contact stress: our rule is selected to arrange foil gauge at cam of camshaft root fillet place, nonstandard driven member pressure head is adopted to utilize equivalent test philosophy to complete the conversion of cam-follower contact force, therefore, this method can realize the camshaft contact stress test of any valve actuating mechanism pattern comprising overhead type.
2. test data is with a high credibility: first this method is found a job the Max.contact stress moment between cycle cam ring-driven member by AVL dynamics calculation module, further analysis obtains the sensitizing range of cam root fillet carrying this moment, and completes layout and the ambulatory stress test of foil gauge.During equivalent test, take out and stationary cam axle, adopt hydraulic pressure, etc. the nonstandard driven member pressure head of shape realize carrying with the location of camshaft contacting, and obtain corresponding crankshaft fillets stress, then solved by equivalent and obtain cam-follower contact force.Before above stress test, all need to carry out state demarcation, temperature compensation, strainometer debugging and prestrain.In addition, the contact bandwidth parameter of hertz formula cam-driven member is also test to obtain in equivalent test.Therefore, the data that whole experimental test obtains are more accurately and reliably.
Accompanying drawing explanation
Fig. 1 is cam root fillet stress engine bench test schematic diagram
Fig. 2 is cam root fillet stress equivalent test front view
Fig. 3 is cam root fillet stress equivalent test left view
The nonstandard driven member of shape, 4-lead-in wire, 5-contact zones, the 6-camshafts such as 1-cam, 2-strainometer, 3-
Embodiment
First by AVL dynamics calculation module find a job cycle cam ring-driven member Max.contact stress time corresponding camshaft degree.
Foil gauge is pasted, by the cam root fillet stress that valve actuating mechanism test-bed dynamic test cam-follower Max.contact stress corner is corresponding at the cam root fillet place of camshaft.
Camshaft ambulatory stress test device, comprises camshaft, strainometer, lead-in wire, tie-plate, wireless transmitter module and wireless receiving module, and described strainometer is distributed in the cam root fillet place of camshaft, camshaft is processed with supplementary aperture; Lead-in wire one end is connected with strainometer, and the other end is connected with wireless transmitter module through supplementary aperture, camshaft hollow oil duct, tie-plate; Wireless transmitter module is fixed on tie-plate; Wireless receiving module is connected with computing machine.
Determine the linear relationship between the contact force of cam-follower and cam root fillet place stress.Stationary cam axle, adopt hydraulic pressure, etc. the nonstandard driven member pressure head of shape realize carrying with the location of camshaft contacting, nonstandard driven member pressure head applies certain pressure, and measurement obtains corresponding cam root fillet stress.Nonstandard driven member pressure head-cam contact power can be calculated according to applied pressure on nonstandard driven member pressure head.So just determine the linear relationship between nonstandard driven member pressure head-cam contact power and cam root fillet stress.
Corresponding cam root fillet stress is turned according to the cam-follower Max.contact stress that dynamic test obtains, in conjunction with the linear relationship between the nonstandard driven member-cam contact power obtained in equivalent testing experiment and cam root fillet stress, determine the maximum unilateral force of cam-roller.
Last according to hertz formula determination contact stress.
Claims (1)
1. an engine overhead air distribution camshaft contact stress method of testing, is characterized in that:
The first step, camshaft degree corresponding when determining work period cam ring-driven member Max.contact stress by AVL dynamics calculation module;
Second step, the cam root fillet stress that between dynamic test cam-follower, Max.contact stress corner is corresponding on valve actuating mechanism test-bed;
3rd step, takes out and stationary cam axle, adopt hydraulic pressure, etc. the nonstandard driven member pressure head of shape locate to carry with camshaft and contact, determine the linear relationship of cam-follower contact force and cam root fillet stress;
4th step, the linear relationship between the cam-follower contact force that the cam root fillet stress determined according to second step and the 3rd step are determined and cam root fillet stress, determines cam-follower maximum unilateral force;
5th step, according to hertz formula determination contact stress.
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| CN201410110600.3A CN103868633B (en) | 2014-03-17 | 2014-03-17 | Engine overhead air distribution camshaft contact stress method of testing |
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| CN201410110600.3A CN103868633B (en) | 2014-03-17 | 2014-03-17 | Engine overhead air distribution camshaft contact stress method of testing |
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| CN103868633B true CN103868633B (en) | 2016-01-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547545A (en) * | 2015-12-04 | 2016-05-04 | 广西玉柴机器股份有限公司 | Method for measuring driving moment of fuel injection pump camshaft |
| CN106643384A (en) * | 2016-12-08 | 2017-05-10 | 中国北方发动机研究所(天津) | Method for measuring accuracy of position of gas distribution roller |
| CN108267253A (en) * | 2018-01-23 | 2018-07-10 | 安徽华菱汽车有限公司 | The test method of contact stress between engine rocker roller and camshaft |
| CN113945307B (en) * | 2021-10-08 | 2023-07-21 | 哈尔滨工程大学 | Sensor and method for measuring contact force of cam tappet of engine |
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