CN206862627U - Fatigue durability testing device for engine connecting rod - Google Patents
Fatigue durability testing device for engine connecting rod Download PDFInfo
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- CN206862627U CN206862627U CN201720748833.5U CN201720748833U CN206862627U CN 206862627 U CN206862627 U CN 206862627U CN 201720748833 U CN201720748833 U CN 201720748833U CN 206862627 U CN206862627 U CN 206862627U
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- connecting rod
- actuating arm
- driving arm
- cam
- piston
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- 238000012360 testing method Methods 0.000 title claims abstract description 56
- 238000013461 design Methods 0.000 abstract description 7
- 238000013522 software testing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
A fatigue endurance testing device for an engine connecting rod comprises a driving motor, a hydraulic cylinder, a flywheel, a guide rod, a connecting rod endurance testing unit and a connecting rod clamping mechanism, wherein the connecting rod endurance testing unit comprises a cam shaft, a first cam, a second cam, a first driving arm, a second driving arm and an intermediate shaft, one end of the first driving arm is attached to the first cam through a first driving arm bearing, meanwhile, the first driving arm is provided with a first driving arm switching wheel and a first driving arm bearing wheel, the second driving arm is attached to the second cam through a second driving arm bearing, the second driving arm is provided with a second driving arm switching wheel and a second driving arm bearing wheel, a push rod connected with the hydraulic cylinder is arranged in a center hole of the second driving arm switching wheel of the connecting rod endurance testing unit, the upper end of the guide rod is fastened to the output end of the second driving arm bearing wheel through a nut, and a spring upper seat, a bearing spring is arranged between the spring upper seat and the cylinder sleeve. The utility model discloses frequency of software testing is high, experimental period is short, and the test result is little with the in-service use difference moreover, can inspect whether the design of connecting rod satisfies the endurance life-span fully.
Description
Technical field
A kind of test device is the utility model is related to, specifically, is related to a kind of engine link fatigue durability testing dress
Put, be mainly used in the fatigue endurance detection of connection rod of automobile engine.
Background technology
Connecting rod is the strength member of passing power in engine, and the rotation that it is changed into the linear motion of piston on bent axle is transported
It is dynamic, bear very big mechanical load.Small end of connecting rod is connected with piston pin, is moved reciprocatingly with piston；Big end fish is bent
Handle pin is connected, and is rotated with bent axle, and the basic load that connecting rod is subject to is stretching and compression, and maximum tension load occurs
In the near top dead center of the beginning of induction stroke, reciprocal inertia force mainly caused by piston and big end above section；
Maximum compression appears in expansion stroke near top dead center, the explosion pressure that mainly piston is subject to, and this power is quite big.In addition,
The tangential inertial force caused by connecting rod swings makes connecting rod, and by additional bending moment, these power are all periodically variable, shapes
Into alternate load.
At present, connecting rod fatigue durability testing is carried out on special connecting rod hydraulic servo fatigue tester, and testing machine leads to
It is often that the associated load that engine link in the case of simulation operation is subject to is come with hydraulic means, to sample without punching in loading procedure
Hit, also allow have gap in sample loading procedure, the purpose mainly analysis connecting rod fatigue load of experiment, but the frequency tested
It is relatively low, it is generally not more than 30 hertz, experiment integral cycle is longer, one usually as part production process of this fatigue test
Main verification method, mainly engine development early stage be applied to prototype preliminary test, subsequently also need to start
Machine entirety durable test does further checking and just can determine that whether connecting rod meets that overall endurance life requires.
Further, since hydraulic servo durability test apparatus is required using interference fit between small end of connecting rod and pin, therefore connect
Lubricating oil can not be filled between the small head bore of bar and piston pin, connecting rod loading conditions in test process have larger with actual condition
Difference, it have impact on the judgement of result of the test.
Therefore, present engine connecting rod durable test device has that test frequency is low, the test period is long and actual test mistake
Loading conditions have the problem of larger difference, result of the test and actual use differ greatly with actual condition in journey.
Utility model content
The purpose of this utility model is to provide a kind of engine link fatigue durability testing device, and the device not only tests frequency
Rate is high, the test period is short, and result of the test and actual use difference are small.
Realizing the technical scheme of the utility model purpose is：A kind of engine link fatigue durability testing device, including drive
Dynamic motor, hydraulic cylinder, flywheel, guide rod, connecting rod durable test unit and connecting rod clamping mechanism, connecting rod clamping mechanism include piston,
Piston pin, crankpin and bent axle, piston are fixed in cylinder sleeve by piston ring, and connecting rod is connected by piston pin with piston, connecting rod
Stub end be fixed on the crankpin of bent axle, connecting rod durable test unit includes camshaft, the first cam, the second cam, the
One actuating arm, the second actuating arm and jackshaft, one end of the first actuating arm are fitted in the first cam by the first actuating arm bearing
On, while the first actuating arm is provided with the first actuating arm conversioning wheel and the first actuating arm bearing wheels, the first actuating arm bearing wheels peace
On jackshaft, the second actuating arm is fitted on the second cam by the second actuating arm bearing, and the second actuating arm is provided with the
Two actuating arm conversioning wheels and the second actuating arm bearing wheels, the second actuating arm bearing wheels are arranged on jackshaft, and the connecting rod is durable
There is the push rod being connected with hydraulic cylinder on the centre bore of second actuating arm conversioning wheel of test cell, guide rod upper end is fastened by nut
In the output end of the second actuating arm bearing wheels, guide rod upper end is provided with the spring seat of honour, and carrying bullet is provided between the spring seat of honour and cylinder sleeve
Spring.
Above-mentioned technical proposal is employed, the utility model has beneficial effect：
The utility model realizes the height of connecting rod fatigue durability testing device by setting a set of cam drive high-frequency device
The durable fortune work(of speed, meanwhile, the device can use several tandem workings, can once detect 3~4 connecting rods, greatly shorten
Durable test time；The load being subject in test process in addition, the course of work of a whole set of test device simulated engine and company
Bar real work approaches, and can sufficiently examine whether the design of connecting rod meets endurance life, avoids follow-up complete machine and verifies
Show problem and changed link design again, ensure that the overall progress time requirement of project.
Brief description of the drawings
Fig. 1 is the top view of the utility model engine link fatigue durability testing working state of device；
Fig. 2 is the first working state schematic representation of the utility model engine link fatigue durability testing device；
Fig. 3 is the utility model engine link fatigue durability testing second of working state schematic representation of device；
Fig. 4 is the third working state schematic representation of the utility model engine link fatigue durability testing device；
Fig. 5 overlooks for the utility model engine link fatigue durability testing unit simulation combustion knock working condition
Figure；
Fig. 6 is the utility model engine link fatigue durability testing unit simulation combustion knock view.
In figure, 1- camshafts；The cams of 2- first；The cams of 3- second；4- motors；The actuating arms of 5- second；51- second drives
Swing arm bearing；52- the second actuating arm conversioning wheels；53- the second actuating arm bearing wheels；6- hydraulic cylinders；61- push rods；7- flywheels；8- is led
Bar；The 9- springs seat of honour；10- cylinder sleeves；11- jackshafts；The actuating arms of 12- first；121- the first actuating arm bearings；122- first drives
Arm conversioning wheel；123- the first actuating arm bearing wheels；13- bearing springs；14- pistons；15- piston pins；16- connecting rods；17- bent axles
Pin；18- bent axles；19- piston rings.
Embodiment
In order that content of the present utility model is easier to be clearly understood, below according to specific embodiment and combine attached
Figure, is described in further detail to the utility model.
Connecting rod is one of most important part of engine, and to make engine structure compact, most suitable length of connecting rod should
It is, in the case where ensureing connecting rod and not collided with other parts during related train motion, to choose small length of connecting rod, and vat
The mid low speed diesel fuel machine in footpath, to reduce lateral pressure, it can suitably lengthen connecting rod.The structure of connecting rod is simultaneously uncomplicated, and big end, small
Area of bed depends primarily on the design of bent axle and piston group.In the design of connecting rod, primary concern is that connecting rod centre-to-centre spacing and
The structure type of large and small head.The motion conditions and stress of connecting rod are all more complicated.In internal combustion engine operation process, connecting rod
Microcephaly center is reciprocating together with piston, bears reciprocal inertia force caused by piston group；Major part center and the connecting rod of bent axle
Axle journal is reciprocating together, bears piston connecting rod unit reciprocal inertia force and the connection rod set rotation not including connecting rod cap
Mass inertial force；Shaft makees composite plane motion, bears stretching compression alternations caused by gas pressure and reciprocal inertia force and answers
Power, and additional bending stress caused by compressive load and swing moment of inertia itself.
, all must be both in terms of development connecting rod new material, new technology and new construction in order to comply with internal combustion engine high speed trend
Be advantageous to improve rigidity and fatigue strength, quality can be mitigated by having, minification.
As shown in Figure 1, 2, a kind of engine link fatigue durability testing device, including motor 4, hydraulic cylinder 6, flywheel
7th, guide rod 8, connecting rod durable test unit and connecting rod clamping mechanism, connecting rod durable test unit include camshaft 1, the first cam 2,
Second cam 3, the first actuating arm 12, the second actuating arm 5 and jackshaft 11, the one end of the first actuating arm 12 pass through the first driving arm axle
Hold 121 to be fitted on the first cam 2, while 12 the first actuating arm conversioning wheel 122 and the first actuating arm are provided with the first actuating arm
Bearing wheels 123, the first actuating arm bearing wheels 123 are arranged on jackshaft 11；Second actuating arm 5 passes through the second actuating arm bearing 51
It is fitted on the second cam 3, the second actuating arm 5 is provided with the second actuating arm conversioning wheel 52 and the second actuating arm bearing wheels 53, the
One actuating arm bearing wheels 123 and the second actuating arm bearing wheels 53 are arranged on jackshaft 11, and the upper end of guide rod 8 is fastened on by nut
The output end of second actuating arm bearing wheels 53, the upper end of guide rod 8 are provided with the spring seat of honour 9, are provided with and hold between the spring seat of honour 9 and cylinder sleeve 10
Spring 13 is carried, has the push rod 61 being connected with hydraulic cylinder 6, connecting rod clamping mechanism bag on the centre bore of the conversioning wheel 52 of the second actuating arm
Include piston 14, piston pin 15, crankpin 17, bent axle 18, piston 14 is fixed in cylinder sleeve 10 by piston ring 19, and connecting rod 16 passes through
Piston pin 15 is connected with piston 14, and the stub end of connecting rod 16 is fixed on the crankpin 17 of bent axle 18.
In addition, when amount detection is more, in order to save the testing time, several detection units are connected on same driving electricity
On machine and load pump, 3~4 connecting rods on-line checking simultaneously is once realized.In addition, the cooling injection system (figure on piston pin
On be not drawn into) can really simulate the actual working state of connecting rod, verify the durable reliability of connecting rod to greatest extent.
The operation principle of the engine link fatigue durability testing device is illustrated below in conjunction with the accompanying drawings.
As shown in Fig. 2 when camshaft 1 drives the second cam 3 to move to cam maximum lift position from base circle position, the
Two actuating arms 5 move upwards, drive guide rod 8 to move downward by the output end of the second actuating arm bearing wheels 53, so as to which band is moved
Bearing spring 13 is compressed downwards at the spring seat of honour 9, while is moved along a straight line downwards with piston 14 and 16 small head end of connecting rod, now connecting rod 16
Stub end and crankpin 15 rotate to bottom position together, and flywheel 7 starts to rotate in the presence of bent axle；Now the first actuating arm
Bearing 121 is fitted in the basic circle bottom of the first cam 2, and among idle running, connecting rod is mainly by compressive load.
As shown in Figure 3,4, when the second cam 3 moves to base circle position, in the presence of the reseting elasticity of bearing spring 15,
Guide rod 8 moves upwards, while is moved along a straight line upwards with piston 14 and 16 small head end of connecting rod, now the stub end of connecting rod 16 and song
Pivot pin 15 rotates to apical position together, and now the first actuating arm bearing 121 moves to the maximum lift position of the first cam 2,
Remain among idle running, connecting rod is mainly stretched load.In this way, completing a durable test circulation, subsequently enter next
Individual test loop.
Currently, during link design, it will usually reserved certain safety coefficient, in general durable test, simply according to
Its actual condition carries out durable test, however, under the actual condition of connecting rod, gonnecting rod body also has left and right in addition to having and moving up and down
Swing, do the plane motion of complexity.Therefore, it is necessary to do a part of reinforced durable test, it is ensured that the endurance life of connecting rod.
As shown in figure 5, when hydraulic cylinder 6 drives push rod 61 to move, by the first actuating arm conversioning wheel 122 and the second actuating arm
Conversioning wheel 52 is cascaded, and because the maximum lift of the first cam 2 is more than the second cam 3, now durable test device is
The leading lower carry out durable test of one cam 2.
As shown in fig. 6, when the maximum lift position in the first cam 2, now the decrement of bearing spring 15 is bigger,
Its follow-up reseting elasticity is also bigger；For being detected connecting rod, it is stretched increases accordingly with compressive load, further tests
The reliability of link design is demonstrate,proved, ensure that being smoothed out for project process.
Particular embodiments described above, the purpose of this utility model, technical scheme and beneficial effect are carried out to enter one
Step describes in detail, should be understood that and the foregoing is only specific embodiment of the utility model, is not limited to this
Utility model, it is all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements done etc., it all should wrap
It is contained within the scope of protection of the utility model.
Claims (1)
1. a kind of engine link fatigue durability testing device, including motor (4), hydraulic cylinder (6), flywheel (7), guide rod
(8), connecting rod durable test unit and connecting rod clamping mechanism, connecting rod clamping mechanism include piston (14), piston pin (15), crankpin
(17) it is fixed on bent axle (18), piston (14) by piston ring (19) in cylinder sleeve (10), connecting rod (16) passes through piston pin (15)
It is connected with piston (14), the stub end of connecting rod (16) is fixed on the crankpin (17) of bent axle (18), it is characterised in that：Connecting rod is resistance to
Long test cell includes camshaft (1), the first cam (2), the second cam (3), the first actuating arm (12), the second actuating arm (5)
With jackshaft (11), one end of the first actuating arm (12) is fitted on the first cam (2) by the first actuating arm bearing (121),
The first actuating arm (12) is provided with the first actuating arm conversioning wheel (122) and the first actuating arm bearing wheels (123), the first driving simultaneously
Arm bearing wheels (123) are arranged on jackshaft (11), and the second actuating arm (5) is fitted in second by the second actuating arm bearing (51)
On cam (3), the second actuating arm (5) is provided with the second actuating arm conversioning wheel (52) and the second actuating arm bearing wheels (53), and second
Actuating arm bearing wheels (53) are arranged on jackshaft (11), the second actuating arm conversioning wheel (52) of the connecting rod durable test unit
Centre bore on have a push rod (61) being connected with hydraulic cylinder (6), guide rod (8) upper end is fastened on the second actuating arm by nut and carried
The output end of (53) is taken turns, guide rod (8) upper end is provided with the spring seat of honour (9), and carrying bullet is provided between the spring seat of honour (9) and cylinder sleeve (10)
Spring (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720748833.5U CN206862627U (en) | 2017-06-26 | 2017-06-26 | Fatigue durability testing device for engine connecting rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720748833.5U CN206862627U (en) | 2017-06-26 | 2017-06-26 | Fatigue durability testing device for engine connecting rod |
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| Publication Number | Publication Date |
|---|---|
| CN206862627U true CN206862627U (en) | 2018-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720748833.5U Withdrawn - After Issue CN206862627U (en) | 2017-06-26 | 2017-06-26 | Fatigue durability testing device for engine connecting rod |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202694A (en) * | 2017-06-26 | 2017-09-26 | 常州机电职业技术学院 | Fatigue durability testing device for engine connecting rod |
-
2017
- 2017-06-26 CN CN201720748833.5U patent/CN206862627U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202694A (en) * | 2017-06-26 | 2017-09-26 | 常州机电职业技术学院 | Fatigue durability testing device for engine connecting rod |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180109 Effective date of abandoning: 20230425 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180109 Effective date of abandoning: 20230425 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |