CN104406780A - Internal combustion engine cylinder fatigue test device - Google Patents
Internal combustion engine cylinder fatigue test device Download PDFInfo
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- CN104406780A CN104406780A CN201410660450.3A CN201410660450A CN104406780A CN 104406780 A CN104406780 A CN 104406780A CN 201410660450 A CN201410660450 A CN 201410660450A CN 104406780 A CN104406780 A CN 104406780A
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- plane
- internal combustion
- combustion engine
- cylinder jacket
- piston
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Abstract
The invention discloses an internal combustion engine cylinder fatigue test device which includes an internal combustion engine and a hydraulic loading equipment. The hydraulic loading equipment uploads the explosion pressure to a combustor of the internal combustion engine through a fuel injector hole of the internal combustion engine. The top of a piston of the internal combustion engine is a slope, and the slope and the axis of a cylinder sleeve form an included angle of Alpha. The explosion pressure can exert side thrust on the slope in the direction perpendicular to the axis of the cylinder sleeve. Compared with existing techniques, the internal combustion engine cylinder fatigue test device can not only simulate the explosion pressure of the cylinder sleeve, but also simulate the lateral thrust exerted by the piston, which is to simulate the compound load on the cylinder sleeve by the internal combustion engine in the actual work, so as to provide effective means to study the fatigue life of cylinder sleeve under the complex load, thus improving the accuracy of the test results.
Description
Technical field
The present invention relates to cylinder jacket of diesel engine fatigue test technology field, particularly a kind of cylinder jacket of diesel engine fatigue experimental device.
Background technology
Cylinder jacket is the core component of internal combustion engines, in internal combustion engine practical work process, and the side-thrust perpendicular to bore axis that cylinder jacket is mainly subject to explosion pressure and is applied by piston.Cylinder jacket, in long-term operation situation, also exists the fatigue break risk produced because of complicated applied force, then has influence on functional reliability and the security of whole internal-combustion engine.
In order to assess this risk, generally will carry out torture test, whether the fatigue strength of checking cylinder jacket meets reliability requirement.Existing cylinder jacket torture test mainly utilizes internal combustion engine self structure, as shown in Figure 1, cylinder jacket exemplar 3 to be tested is installed in cylinder body 1, then according to internal combustion engine standard assembly technology flow process by assembling components such as piston 2, piston pin 4, connecting rod 5, bent axle 6, cylinder body main bearing 7, cylinder cap 8 and fuel injectors 9.In torture test process, pump into high-voltage oil liquid by oil injector hole to firing chamber by oil pump, with simulated engine maximum outbreak pressure, thus examination cylinder jacket fatigue strength.
Obviously, the scheme that above-mentioned test loads, the only simple fatigue strength considering explosion pressure effect lower cylinder cover, have ignored internal combustion engine in real work side thrust of piston on the impact of cylinder jacket fatigue strength, must cause like this test findings and true value deviation excessive, i.e. the problem of test findings poor accuracy.
In view of this, in cylinder jacket torture test process, being improved the accuracy of test findings by the combined load suffered by which kind of means Simulated gas cylinder sleeve, is those skilled in the art's technical matterss urgently to be resolved hurrily.
Prior art is compared, cylinder jacket of diesel engine fatigue experimental device in this programme, the side-thrust that piston applies also is simulated while the explosion pressure that Simulated gas cylinder sleeve is subject to, also the compound loading to cylinder jacket in internal combustion engine real work is namely simulated, thus provide effective means the fatigue lifetime under combined load for studying cylinder jacket, theoretical actual value is more trended towards to make test findings, improve the degree of accuracy of test findings, so for internal combustion engine reliability research test figure more is accurately provided.
In a preferred version of the present invention, the inclined-plane of top land is specially plane, and side-thrust is shown below:
F″
2＝P×A
2×cosα
Wherein, P represents explosion pressure, A
2represent the area on described inclined-plane.
Inclined-plane adopts planar structure, has processing and the simple feature of areal calculation process.
In another preferred version of the present invention, this cylinder jacket of diesel engine fatigue experimental device also comprises rea adjusting part, described rea adjusting part has the bottom surface that fits with described inclined-plane and the end face perpendicular to described bore axis, described rea adjusting part is fixedly connected with described piston, and the periphery wall split of its periphery wall and described piston forms a complete face of cylinder, and described side-thrust is shown below:
F″
2＝P×(A
2-ΔA
2)×cosα
Wherein, Δ A
2represent the base area of described rea adjusting part.
The program fills up inclined-plane area Δ A by adjustment block
2, under the prerequisite not changing piston concrete structure, achieve the order of adjustment inclined-plane size, eliminate preparation different angles inclined-plane Piston Process, thus while significantly reducing torture test cost, also expanded the versatility of this test unit.
Rea adjusting part in such scheme comprises the multiple adjustment blocks superposed successively along described bore axis, and multiple described adjustment block assembly is connected by bolt assembly and described piston.
This rea adjusting part adopts multiple adjustment block stack combinations mode, inclined-plane size is adjusted by adding or removing adjustment block, then in process of the test, form the different side-thrusts that actual tests needs, namely also same piston can meet the large small test demand of different side-thrust, thus reduce further torture test cost, expanded the versatility of this test unit.
Preferably, the top of described piston also comprises the plane perpendicular to described bore axis, described inclined-plane is downward-sloping relative to described plane.
Preferably, described simulation explosion pressure is specially according to the periodically variable pulsed load of internal combustion engine real work.
Preferably, described hydraulic loaded equipment is specially channel-type hydraulic fatigue test equipment.
Summary of the invention
The invention provides a kind of cylinder jacket of diesel engine fatigue experimental device, the combined load in torture test process suffered by Simulated gas cylinder sleeve, to improve the accuracy of test findings.
In order to achieve the above object, the invention provides a kind of cylinder jacket of diesel engine fatigue experimental device, comprise torture test internal combustion engine and hydraulic loaded equipment, hydraulic loaded equipment loads explosion pressure by the oil injector hole of internal combustion engine to its firing chamber, the top of the piston of internal combustion engine comprises inclined-plane, inclined-plane becomes α angle with the axis of described cylinder jacket, and described explosion pressure applies the side-thrust perpendicular to described bore axis direction to described inclined-plane.
Accompanying drawing explanation
The structural representation of the existing cylinder jacket of diesel engine fatigue experimental device of Fig. 1;
Fig. 2 shows the sectional structure schematic diagram of cylinder jacket of diesel engine fatigue experimental device one embodiment provided by the present invention;
Fig. 3 shows the force analysis schematic diagram of the fatigue experimental device of cylinder jacket of diesel engine shown in Fig. 2 piston;
Fig. 4 shows the plan structure schematic diagram of piston shown in Fig. 3;
Fig. 5 shows the sectional structure schematic diagram of another embodiment of the fatigue experimental device of cylinder jacket of diesel engine shown in Fig. 2;
Fig. 6 shows the force analysis schematic diagram of the fatigue experimental device of cylinder jacket of diesel engine shown in Fig. 5 piston;
Fig. 7 shows the plan structure schematic diagram of piston shown in Fig. 6;
Fig. 8 shows the sectional structure schematic diagram of rea adjusting part in Fig. 5.
Corresponding relation in Fig. 1 to Fig. 8 between Reference numeral and all parts title:
1 cylinder body, 2 pistons, 21 inclined-planes, 22 planes, 23 rea adjusting parts, 231 adjustment blocks, 231a mounting hole, 3 cylinder jacket, O bore axis, 4 piston pins, 5 connecting rods, 6 bent axles, 7 cylinder body main beating cap, 8 cylinder caps, 9 fuel injectors, A firing chamber.
Embodiment
The invention provides a kind of cylinder jacket of diesel engine fatigue experimental device, when being intended to simulate internal combustion engine real work, cylinder jacket bears the side-thrust that maximum outbreak pressure and piston apply it, thus the compound loading achieved cylinder jacket, for providing effective means the fatigue lifetime studied under this combined load.
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.It should be noted that, the noun of locality " top " involved herein, " end " and D score set for benchmark with Fig. 2 in Figure of description, is appreciated that the appearance of the above-mentioned noun of locality does not limit protection scope of the present invention.
Refer to Fig. 2, this illustrates the sectional structure schematic diagram of cylinder jacket of diesel engine fatigue experimental device one embodiment provided by the present invention.
Cylinder jacket of diesel engine fatigue experimental device provided by the present invention, comprises torture test internal combustion engine and by the hydraulic loaded equipment of engine cylinder head system oil injector hole to pump-in pressure fluid in firing chamber.It should be noted that, in the present invention except the concrete structure of piston, the assembly relation of other modular constructions of cylinder jacket of diesel engine fatigue experimental device and inter-module is substantially identical with prior art, those skilled in the art can realize completely based on prior art, so only set forth the concrete structure of its inventive point piston at this herein.
As shown in Figure 2, the top of torture test internal combustion engine 2 is by the plane 22 perpendicular to cylinder jacket 3 axis and become the inclined-plane 21 of α angle to form with cylinder jacket 3 axis, and this relative level face 22, inclined-plane 21 is downward-sloping.For the ease of understanding the concrete structure of piston better, please also refer to Fig. 3 and Fig. 4, wherein, Fig. 3 shows the force analysis schematic diagram of the fatigue experimental device of cylinder jacket of diesel engine shown in Fig. 2 piston, and Fig. 4 shows the plan structure schematic diagram of piston shown in Fig. 3.
The top of this piston 2 adopts surface level 22 and inclined-plane 21 splitting mode, can ensure that piston has enough Rigidity and strengths on the one hand, prevent the distortion of piston under explosion pressure effect, and the effective transmission to mechanical load acting force, effectively improve poor lubrication when piston slides along cylinder wall surface under high wall pressure effect on the other hand, improve the problem that friction loss is large.Be appreciated that and meeting on the basis that combined load function that Simulated gas cylinder sleeve bears, processing and assembly technology require, the topside perspective of this piston is inclined-plane.
In addition, the inclined-plane 21 of piston is specially a plane, has the advantages that structure is simple, be convenient to processing and short form test operating process.Certainly, meeting on the basis that combined load function that Simulated gas cylinder sleeve bears, processing and assembly technology require, this inclined-plane is curved surface or other structures.
In process of the test, after the hydraulic loaded equipment pressure oil liquid that is P by pressure injects firing chamber, as shown in Figure 3, piston 2 is subject to the pressure F perpendicular to surface level 22 (being parallel to bore axis) applied by pressure oil liquid
1with the pressure F perpendicular to its inclined-plane 21
2, from hydrostatic pressure formula:
F
1=P × A
1formula (1)
F
2=P × A
2formula (2)
Wherein, F
2be decomposed into the axial force F along being parallel to cylinder jacket 3 axis further
2' and perpendicular to the side-thrust F of cylinder jacket 3 axis
2", this side-thrust F
2" be:
F
2"=P × A
2× cos α formula (3)
This side-thrust F
2" put on the side-thrust of cylinder jacket 3 for simulating piston 2 in internal combustion engine practical work process, and side-thrust F
2" concrete numerical value can be obtained by finite element analysis computation according to power of IC engine and correlation performance parameters, this analysis calculation method is ripe prior art, and those skilled in the art can realize completely based on prior art, so do not repeat them here.
In sum, compared with prior art, this cylinder jacket of diesel engine fatigue experimental device, the side-thrust that piston applies also is simulated while the explosion pressure that Simulated gas cylinder sleeve is subject to, also the compound loading to cylinder jacket in internal combustion engine real work is namely simulated, thus provide effective means the fatigue lifetime under combined load, so that test findings more trends towards theoretical value for studying cylinder jacket.
In addition, constant pressure fluid is pumped into adopting oil pump in prior art, the maximum outbreak pressure of only simulating internal combustion engine is compared, using channel-type hydraulic fatigue test equipment as pressure loading device in this programme, combustion motor applies simulation explosion pressure load, that is, in the inner fluid pressure simulation internal combustion engine real work of firing chamber, explosion pressure is specially according to the periodically variable pulsed load of internal combustion engine real work, so, process of the test is made more to trend towards internal combustion engine real work state, thus make test findings closer to actual value, thus further increasing the degree of accuracy of test findings.
When needing tested cylinder to overlap 3 fatigue limit at equal explosion pressure P under different size side-thrust, based on formula (3), can adopt and realize this purpose in two ways, in detail:
One, keeps inclined-plane 21 area A
2constant, calculate according to formula (3) and obtain required side-thrust F
2" time required corresponding angle α, then process satisfactory inclined-plane 21 at piston 2 top;
Two, keep piston 2 shape invariance, calculate according to formula (3) and obtain required side-thrust F
2" time required inclined-plane 21 area A
2', then calculate actual inclined-plane area A
2with corresponding side-thrust inclined surface area A
2' difference DELTA A
2.
Second method of adjustment realizes by setting up rea adjusting part 23 on piston inclined-plane 21.In detail, as shown in Figure 5, this rea adjusting block 23 has and to fit with piston inclined-plane 21 and area equals Δ A
2bottom surface, the end face vertical with bore axis O and the circular arc periphery wall fitted with cylinder jacket internal perisporium, the periphery wall of this rea adjusting part and the periphery wall split of piston form a complete face of cylinder, and are connected by bolt assembly 24 and this piston 2.Piston 2 is sealed by the madial wall that this face of cylinder and cylinder 3 overlap and fits, and in other words, this rea adjusting part 23 is similar to piston 2 cut-out shape.For the ease of understanding the concrete structure setting up rea adjusting part back piston better, please also refer to Fig. 6 and Fig. 7, wherein, Fig. 6 shows the force analysis schematic diagram of the fatigue experimental device of cylinder jacket of diesel engine shown in Fig. 5 piston, and Fig. 7 shows the plan structure schematic diagram of piston shown in Fig. 6.
Composition graphs 6 is known, and the side-thrust that piston 2 puts on cylinder jacket 3 is:
F
2"=P × (A
2-Δ A
2) × cos α formula (4)
Compared with the first scheme, first scheme fills up inclined-plane area Δ A by rea adjusting part 23
2, under the prerequisite not changing piston 2 concrete structure, achieve the order of adjustment inclined-plane 21 size, eliminate preparation different angles inclined-plane Piston Process, thus while significantly reducing torture test cost, also expanded the versatility of this test unit.
In order to expand the versatility of this test unit further, as shown in Figure 8, this rea adjusting part 23 specifically to be superposed successively along bore axis by multiple adjustment block 231 and is formed, and each adjustment block offers mounting hole 231a, the screw rod of bolt assembly 24 is fixedly connected with piston 2 through the mounting hole of each adjustment block successively again.
This rea adjusting part 23 adopts multiple adjustment block 231 stack combinations mode, inclined-plane 21 size is adjusted by adding or removing adjustment block 231, then in process of the test, form the different side-thrusts of actual needs, also namely same piston can meet the large small test demand of different side-thrust.
The foregoing is only the preferred embodiment of the present invention, do not form limiting the scope of the present invention.Any any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within claims of the present invention.
Claims (7)
1. a cylinder jacket of diesel engine fatigue experimental device, comprise torture test internal combustion engine and hydraulic loaded equipment, described hydraulic loaded equipment loads explosion pressure by the oil injector hole of described internal combustion engine to its firing chamber, it is characterized in that, the top of the piston (2) of described internal combustion engine comprises inclined-plane (21), described inclined-plane (21) becomes α angle with the axis of described cylinder jacket (3), and described explosion pressure applies the side-thrust perpendicular to described bore axis direction to described inclined-plane.
2. cylinder jacket of diesel engine fatigue experimental device as claimed in claim 1, it is characterized in that, described inclined-plane (21) are specially plane, and described side-thrust is shown below:
F
2″＝P×A
2×cosα
Wherein, P represents explosion pressure, A
2represent the area of described inclined-plane (21).
3. cylinder jacket of diesel engine fatigue experimental device as claimed in claim 2, it is characterized in that, also comprise rea adjusting part (23), described rea adjusting part (23) has the bottom surface that fits with described inclined-plane (21) and the end face perpendicular to described bore axis, described rea adjusting part (23) is fixedly connected with described piston (2), and the periphery wall split of its periphery wall and described piston (2) forms a complete face of cylinder, and described side-thrust is shown below:
F
2″＝P×(A
2-ΔA
2)×cosα
Wherein, Δ A
2represent the base area of described rea adjusting part.
4. cylinder jacket of diesel engine fatigue experimental device as claimed in claim 3, it is characterized in that, described rea adjusting part (23) comprises the multiple adjustment blocks (231) superposed successively along described bore axis, and multiple described adjustment block (231) is connected by bolt assembly (24) and described piston (2).
5. the cylinder jacket of diesel engine fatigue experimental device according to any one of Claims 1-4, the top of described piston (2) also comprises and the plane of the axes normal of described cylinder jacket (22), and described inclined-plane (21) are downward-sloping relative to described plane (22).
6. cylinder jacket of diesel engine fatigue experimental device as claimed in claim 5, is characterized in that, described explosion pressure is specially according to the periodically variable pulsed load of internal combustion engine real work.
7. cylinder jacket of diesel engine fatigue experimental device as claimed in claim 6, it is characterized in that, described hydraulic loaded equipment is specially channel-type hydraulic fatigue test equipment.
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|---|---|---|---|
| CN201410660450.3A CN104406780B (en) | 2014-11-18 | 2014-11-18 | Internal combustion engine cylinder fatigue test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410660450.3A CN104406780B (en) | 2014-11-18 | 2014-11-18 | Internal combustion engine cylinder fatigue test device |
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| CN104406780A true CN104406780A (en) | 2015-03-11 |
| CN104406780B CN104406780B (en) | 2017-04-26 |
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| CN112345256A (en) * | 2020-11-19 | 2021-02-09 | 中国第一汽车股份有限公司 | Engine cylinder fatigue test method |
| CN112666016A (en) * | 2020-12-21 | 2021-04-16 | 中国北方发动机研究所(天津) | Tensile-compressive fatigue test device for engine cylinder block component |
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| RU2479831C2 (en) * | 2011-05-04 | 2013-04-20 | Государственное научное учреждение Всероссийский научно-исследовательский технологический институт ремонта и эксплуатации машинно-тракторного парка Российской академии сельскохозяйственных наук (ГНУ ГОСНИТИ РОССЕЛЬХОЗАКАДЕМИИ) | Method of defining ice sleeve assembly residual life |
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| CN103759926B (en) * | 2013-12-12 | 2016-04-27 | 中国北方发动机研究所(天津) | Cylinder sleeve fatigue test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345256A (en) * | 2020-11-19 | 2021-02-09 | 中国第一汽车股份有限公司 | Engine cylinder fatigue test method |
| CN112666016A (en) * | 2020-12-21 | 2021-04-16 | 中国北方发动机研究所(天津) | Tensile-compressive fatigue test device for engine cylinder block component |
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| CN104406780B (en) | 2017-04-26 |
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