CN111373879B - Device is applyed to engine organism test load - Google Patents
Device is applyed to engine organism test load Download PDFInfo
- Publication number
- CN111373879B CN111373879B CN201010049229.6A CN201010049229A CN111373879B CN 111373879 B CN111373879 B CN 111373879B CN 201010049229 A CN201010049229 A CN 201010049229A CN 111373879 B CN111373879 B CN 111373879B
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- pressure
- test
- sealing ring
- amplifier
- cylinder cover
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Abstract
The invention belongs to the technical field of engine tests, and particularly relates to a load applying device for an engine body test. The device comprises a cylinder cover, a cylinder gasket, a nonstandard piston, a connecting rod, a crankshaft or a nonstandard straight shaft and an O-shaped sealing ring, and further comprises a pressure amplifier and a high-pressure cavity, wherein the high-pressure cavity is connected with the cylinder cover by uniformly distributed bolts, the top of the nonstandard piston is provided with an internal thread matched with the pressure amplifier, the pressure amplifier is screwed on the nonstandard piston by the thread, a test pressure cavity is formed between the top of the pressure amplifier and the high-pressure cavity, and the pressure amplifier is radially sealed by the O-shaped sealing ring and the high. The invention improves the reliability of the sealing link in the high-explosion pressure engine body test, reduces the load of test equipment and ensures the smooth operation of the high-explosion pressure engine body reliability test. The test efficiency is improved, and meanwhile, the loading capacity of the test system is also improved.
Description
Technical Field
The invention belongs to the technical field of engine tests, and particularly relates to a load applying device for an engine body test.
Background
With the continuous improvement of the explosion pressure and the power density of the engine, the reliability of engine parts faces a severe test, wherein the reliability of an engine body as an engine framework is particularly important, and not only needs to be calculated, analyzed and evaluated in the engine development stage, but also the reliability can be ensured through physical stress measurement and fatigue test verification.
Through the engine body test load applying device, a simulated explosive pressure load can be applied to the high explosive pressure engine body, so that the fatigue reliability of the engine body is examined and the stress under dynamic and static loads is measured.
At present, a method for simulating explosive pressure by injecting hydraulic oil into a combustion chamber is generally adopted in engine body part tests, and fatigue examination of an engine body and measurement of the stress of the engine body under dynamic and static loads can be carried out. The outlet pressure of an electro-hydraulic servo test system for load application is generally not more than 30MPa, but along with the increasing of the explosion pressure of an engine, the requirement on the reliability of parts is higher, the maximum test load required to be applied when a part of diesel engines are tested exceeds 30MPa, and exceeds or approaches the limit capacity of most international electro-hydraulic servo test systems, when fatigue tests are carried out, the test system runs under the high load for a long time, the service life of the test system is adversely affected, and a traditional test method is adopted under the test load exceeding 25MPa, the sealing link of a machine body load application device is easy to fail, and the smooth running of the tests cannot be guaranteed.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a load applying device for an engine body test, which meets the requirements of the fatigue reliability test and the load application in stress measurement of the engine body.
The invention adopts the technical scheme that the engine body test load applying device comprises a cylinder cover, a cylinder gasket, a non-standard piston, a connecting rod, a crankshaft or non-standard straight shaft and an ○ type sealing ring, wherein the crankshaft or non-standard straight shaft is arranged on a main bearing hole of a machine body test cylinder, the cylinder cover is arranged on an engine body through a cylinder cover bolt, the cylinder gasket is positioned between the cylinder cover and the machine body, the non-standard piston is connected with the connecting rod through a piston pin, the large end of the connecting rod is arranged on a connecting rod shaft neck of the crankshaft or the non-standard straight shaft through the connecting rod bolt, the device also comprises a pressure amplifier and a high-pressure cavity, the high-pressure cavity is connected with the cylinder cover through uniformly distributed bolts, the top of the non-standard piston is provided with an internal thread matched with the pressure amplifier, the pressure amplifier is screwed on the non-standard piston through a thread, a test.
The pressure amplifier comprises an amplifier head part, a sealing ring groove, an amplifier rod part and a connecting thread, wherein the amplifier head part is arranged at the upper end of the amplifier rod part, the connecting thread is arranged at the bottom end of the amplifier rod part, and the sealing ring groove is arranged at the amplifier head part; the cylinder cover is a non-standard cylinder cover.
The invention has the advantages of
Compared with the traditional loading device, the invention adds the pressure amplifier and the high-pressure cavity, changes the cylinder cover into a non-standard cylinder cover, increases the internal thread for installing the pressure amplifier at the top of the non-standard piston, cancels the sealing ring groove on the non-standard piston, moves the ○ type sealing ring onto the pressure amplifier, reduces the sealing link at the cylinder gasket, reduces the hydraulic oil pressure in the test pressure cavity by utilizing the Pascal principle and the ratio of the area of the pressure amplifier to the area of the engine cylinder, greatly reduces the pressure born by the ○ type sealing ring, improves the reliability of the sealing link in the high-explosion pressure engine body test, reduces the load of test equipment, and ensures the smooth performance of the reliability test of the high-explosion pressure engine body.
The device is mainly used for load application during engine body fatigue test, fatigue limit test and dynamic and static stress measurement, the method enables the working load of the test system to be properly reduced by controlling the area of the pressure amplifier, reduces the abrasion of the test system, solves the sealing problem of the engine body fatigue test under high explosion pressure, improves the test efficiency and simultaneously improves the loading capacity of the test system.
The device is compared with the original test technology through stress measurement, and test data show that the influence of the device on the stress and deformation of the machine body can be ignored.
Drawings
The invention has 3 figures, wherein, figure 2 is the best embodiment of the invention, and can also be used as the figure of the abstract of the specification.
FIG. 1 is a schematic diagram of a prior art structure of the present invention;
FIG. 2 is a schematic structural view of the present invention;
fig. 3 is a schematic structural diagram of the pressure amplifier of fig. 2.
Detailed Description
The preferred embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the conventional engine body test load applying device includes a cylinder head 1, a cylinder gasket 2, a non-standard piston 3, a connecting rod 4, a crankshaft or non-standard straight shaft 5 and an ○ -shaped seal ring 6, wherein the crankshaft or non-standard straight shaft 5 is mounted on a main bearing hole of a test cylinder of a tested engine body, the cylinder head 1 is mounted on the engine body through a cylinder head bolt, the cylinder gasket 2 is located between the cylinder head 1 and the engine body, the non-standard piston 3 and the connecting rod 4 are connected through a piston pin, a large head of the connecting rod 4 is mounted on a connecting rod journal of the crankshaft or non-standard straight shaft 5 through the connecting rod bolt, and a test pressure chamber 7 is formed between the top of the non.
When the hydraulic testing device works, hydraulic oil enters the testing pressure cavity 7 from a pressure oil inlet at the top of the cylinder cover 1, the explosion pressure of an engine during working is simulated by the hydraulic oil, and a load is transmitted to a main bearing of the engine body through the connecting rod, so that the load of the engine body is applied, the hydraulic oil of the testing pressure cavity 7 is sealed by the cylinder gasket 2 and the ○ -shaped sealing ring 6, after the testing pressure exceeds 25MPa, the service life of the sealing ring 6 is greatly shortened, reliable sealing cannot be guaranteed, and the smooth performance of a fatigue test is particularly influenced.
As shown in figure 2, the engine body test load applying device comprises a cylinder cover 1, a cylinder gasket 2, a non-standard piston 3, a connecting rod 4, a crankshaft or non-standard straight shaft 5 and a ○ type sealing ring 6, wherein the crankshaft or non-standard straight shaft 5 is installed on a main bearing of a body test cylinder, the cylinder cover 1 is installed on an engine body through a cylinder cover bolt, the cylinder gasket 2 is located between the cylinder cover 1 and the engine body, the non-standard piston 3 and the connecting rod 4 are connected through a piston pin, a large head of the connecting rod 4 is installed on a connecting rod shaft neck of the crankshaft or non-standard straight shaft 5 through the connecting rod bolt, the device further comprises a pressure amplifier 8 and a high-pressure cavity 9, the high-pressure cavity 9 is connected with the cylinder cover 1 through uniformly distributed bolts, internal threads matched with the pressure amplifier 8 are arranged at the top of the non-standard piston 3, the pressure amplifier 8 is screwed on the non-standard piston 3 through threads, a test pressure cavity 7 is formed between the top of the pressure amplifier 8 and the high-.
As shown in fig. 3, the pressure amplifier 8 includes an amplifier head 10, a seal ring groove 11, an amplifier rod 12 and a connecting thread 13, the amplifier head 10 is disposed at the upper end of the amplifier rod 12, the connecting thread 13 is disposed at the bottom end of the amplifier rod 12, the amplifier head 10 is circular, and the seal ring groove 11 is disposed on the amplifier head 10.
The ratio of the top area of the pressure amplifier head 10 to the cylinder area determines the amplification factor, which is determined by controlling the maximum test load applied to be 10MPa to 15MPa, <tttranslation = and >t &o <t/t >ttype seal ring 6 having a sectional diameter of 5.3mm or 7mm, and one or two seal ring grooves 11 are arranged in the amplifier head 10 according to the diameter of the seal ring 6.
The length of the amplifier rod part 12 is mainly used for adjusting the height of the pressure amplifier 8 to be matched with the height positions of the cylinder cover 1 and the high-pressure cavity 9, the height of the finally formed test pressure cavity 7 is 1 mm-1.5 mm, and the connecting thread 13 is used for being connected with the piston 1.
When the test device works, hydraulic oil enters the test pressure cavity 7 from a pressure oil inlet at the top of the high-pressure cavity 9, the area of the pressure amplifier 8 is larger than that of an engine cylinder, the pressure required to be applied by the test pressure cavity is reduced according to the Pascal principle, the load is transmitted to the partition plate and the main bearing through the connecting rod, and the explosive pressure during the working of the engine is simulated to apply the load to the engine body.
Claims (2)
1. A device for applying a test load to an engine body comprises a cylinder cover (1), a cylinder gasket (2), a non-standard piston (3), a connecting rod (4), a crankshaft or non-standard straight shaft (5) and an ○ type sealing ring (6), wherein the crankshaft or non-standard straight shaft (5) is installed on a main bearing hole of a body test cylinder, the cylinder cover (1) is installed on the engine body through a cylinder cover bolt, the cylinder gasket (2) is located between the cylinder cover (1) and the engine body, the non-standard piston (3) and the connecting rod (4) are connected through a piston pin, the large end of the connecting rod (4) is installed on a connecting rod journal of the crankshaft or the non-standard straight shaft (5) through a connecting rod bolt, the device is characterized by further comprising a pressure amplifier (8) and a high-pressure cavity (9), the high-pressure cavity (9) is connected with the rod part of the cylinder cover (1) through uniformly distributed bolts, the top of the non-standard piston (3) is provided with an internal thread matched with the pressure amplifier (8), the pressure amplifier (8) is screwed on the non-standard piston (3) through a thread, the pressure amplifier (8) is connected with the high-pressure amplifier (8) through a sealing ring (358) and a sealing ring (13), the head part of a sealing ring (10) is connected with a circular sealing ring (10), and a sealing ring (10) at the top end of a sealing ring (10), and a sealing ring (10) which are connected with the.
2. An engine block test load applying apparatus as set forth in claim 1, wherein: the cylinder cover (1) is a non-standard cylinder cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010049229.6A CN111373879B (en) | 2010-07-29 | 2010-07-29 | Device is applyed to engine organism test load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010049229.6A CN111373879B (en) | 2010-07-29 | 2010-07-29 | Device is applyed to engine organism test load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111373879B true CN111373879B (en) | 2014-04-30 |
Family
ID=71223040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010049229.6A Expired - Fee Related CN111373879B (en) | 2010-07-29 | 2010-07-29 | Device is applyed to engine organism test load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111373879B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211553A (en) * | 2018-09-30 | 2019-01-15 | 滨州学院 | Piston pin hole fatigue experimental device and method |
| CN110486177A (en) * | 2017-08-29 | 2019-11-22 | 熵零技术逻辑工程院集团股份有限公司 | A kind of high detonation pressure engine |
| CN112798273A (en) * | 2020-12-22 | 2021-05-14 | 中国北方发动机研究所(天津) | Machine body part test method for accurately simulating loading of main bearing hole of engine |
| CN114923609A (en) * | 2022-05-31 | 2022-08-19 | 东风商用车有限公司 | Engine crankshaft dangerous part peak stress detection device |
-
2010
- 2010-07-29 CN CN201010049229.6A patent/CN111373879B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486177A (en) * | 2017-08-29 | 2019-11-22 | 熵零技术逻辑工程院集团股份有限公司 | A kind of high detonation pressure engine |
| CN109211553A (en) * | 2018-09-30 | 2019-01-15 | 滨州学院 | Piston pin hole fatigue experimental device and method |
| CN112798273A (en) * | 2020-12-22 | 2021-05-14 | 中国北方发动机研究所(天津) | Machine body part test method for accurately simulating loading of main bearing hole of engine |
| CN114923609A (en) * | 2022-05-31 | 2022-08-19 | 东风商用车有限公司 | Engine crankshaft dangerous part peak stress detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR03 | Grant of secret patent right | ||
| GRSP | Grant of secret patent right | ||
| DC01 | Secret patent status has been lifted | ||
| DC01 | Secret patent status has been lifted | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20210729 |