CN112729715B - Valve oil seal test device and test method thereof - Google Patents
Valve oil seal test device and test method thereof Download PDFInfo
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- CN112729715B CN112729715B CN202110062871.6A CN202110062871A CN112729715B CN 112729715 B CN112729715 B CN 112729715B CN 202110062871 A CN202110062871 A CN 202110062871A CN 112729715 B CN112729715 B CN 112729715B
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- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000010998 test method Methods 0.000 title claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 65
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000004088 simulation Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a valve oil seal test device and a test method thereof, which relate to the technical field of engine valve verification.
Description
Technical Field
The invention relates to the technical field of engine valve verification, in particular to a valve oil seal test device and a test method thereof.
Background
The valve oil seal is one of key elements of a valve assembly in an engine, the performance of the valve oil seal directly determines the operation time scale of the engine, and the reliability of the valve oil seal is tested and verified to be of great significance. The Chinese patent document with publication number CN201476948U discloses a technical scheme for verifying the valve oil seal by simulating the actual working condition of an engine. However, during the practical use process, we find that in these technical solutions, the vacuum tube and the oil cup (corresponding to the combustion chamber of the engine) of the vacuum pump are mainly used to simulate the positive and negative pressure environment faced by the air outlet valve assembly under the actual working condition. Because the inner diameter of the vacuum tube is smaller and the connection length between the vacuum pump and each oil cup is different, under the influence of pressure drop, the vacuum pressure established by each oil cup may have a certain difference, that is, the positive and negative pressure environments faced by the valve assembly corresponding to each oil cup may be different, which may affect the test result.
Disclosure of Invention
The invention aims to provide a valve oil seal test device, which has higher test accuracy.
Embodiments of the present invention are implemented as follows:
The valve oil seal testing device comprises a simulation cylinder cover, wherein the simulation cylinder cover comprises a cam shaft and a plurality of valve guide holes, valve springs and valve rods which are formed at the open end of the simulation cylinder cover, and the valve oil seal testing device is characterized by further comprising:
the number of the collecting pipes corresponds to that of the valve guide pipe holes, the two axial ends of the collecting pipes respectively form guide pipe ends and extending ends, the guide pipe ends penetrate into the corresponding valve guide pipe holes, and the extending ends extend out of the simulated cylinder cover at one end, back to the cam shaft, of the valve guide pipe holes; the collecting pipe is also provided with an inner hole which extends along the axis and is communicated with the collecting pipe, the valve rod penetrates into the inner hole and forms transmission with the cam shaft, and the end of the guide pipe is provided with a test oil seal which is in sealing fit with the valve rod;
The collecting chamber is arranged below the simulated cylinder cover and is in a shape of a closed shell with an inner cavity, the open end of the simulated cylinder cover is closed by the top surface of the collecting chamber, the extending end of the collecting pipe penetrates through the shell of the collecting chamber and penetrates into the inner cavity of the collecting chamber after extending out of the simulated cylinder cover, the outer wall of the collecting pipe is in airtight fit with the shell of the collecting chamber, a through hole which is arranged between the two ends of the collecting pipe and is communicated with the inner cavity of the collecting chamber is formed on the collecting pipe, and the inner cavity of the collecting chamber can be established to be positive pressure or negative pressure;
And the driving device is in transmission connection with a cam shaft of the simulated cylinder cover, so that the cam shaft is matched with the valve spring to drive the valve rod to reciprocate in the inner hole.
Preferably, the oil collecting cup body is in a cup body shape, the cup mouth end of the oil collecting cup body is connected with the extending end of the collecting pipe, and the inner cavity of the oil collecting cup body is communicated with the inner hole.
Preferably, the oil collecting cup body is transparent, and the collecting chamber is provided with an observation window.
Preferably, the opening end and the extending end of the oil collecting cup body are in threaded connection.
Preferably, the collecting pipe comprises a first pipe body and a second pipe body which are sequentially arranged along the axial direction of the collecting pipe, the pipe end is formed on the first pipe body, the extending end is formed on the second pipe body, and the first pipe body and the second pipe body are detachably connected.
Preferably, the first pipe body and the second pipe body are in threaded connection.
Preferably, the number of valve guide holes on the simulated cylinder cover is 8.
Preferably, the device further comprises a vacuum pump for establishing positive or negative pressure in the inner cavity of the collecting chamber, wherein the vacuum pump is communicated with the inner cavity of the collecting chamber.
Preferably, the driving device comprises a variable frequency driving motor, and an output shaft of the variable frequency driving motor is in transmission connection with the cam shaft.
The invention also provides a test method of the valve oil seal test device, which comprises the following steps:
installing a simulation cylinder cover, a collecting pipe and a collecting chamber;
heating the circulating engine oil of the simulated cylinder cover;
establishing different positive and negative pressure environments in the inner cavity of the collecting chamber;
And starting the driving device, and measuring the oil leakage amount discharged by the extending end of the inner hole under different positive and negative pressure environments to judge the oil leakage condition of the test oil seal under different positive and negative pressure environments.
Due to the adoption of the technical scheme, the beneficial effects of the invention include:
The invention mainly adopts the simulated cylinder cover to simulate the real working condition of the engine to verify the test oil seal, and simultaneously adopts the collecting chamber with the closed inner cavity to uniformly establish negative pressure, so that the positive and negative pressure environments facing each test oil seal are the same, and the test accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of an embodiment 1 of the present invention;
FIG. 2 is a schematic illustration showing an exploded view of embodiment 1 of the present invention;
FIG. 3 is a schematic view showing the structure of a valve guide hole in a simulated cylinder head according to embodiment 1 of the present invention;
FIG. 4 is a schematic view showing the structure of a collecting pipe according to embodiment 1 of the present invention;
FIG. 5 is a schematic illustration of the fit between the collection tube and the valve guide bore of example 1 provided by the present invention;
fig. 6 is a schematic diagram showing the cooperation between the valve guide hole and the valve stem in embodiment 1 according to the present invention.
[ Detailed description ] of the preferred embodiments
1-A simulated cylinder cover, 11-a valve guide pipe hole, 12-a valve rod, 13-a cam shaft and 14-a test oil seal;
2-collecting pipe, 21-first pipe body, 21 a-guide pipe end, 22-second pipe body, 22 b-extension end, 23-through hole and 24-oil collecting cup body;
3-collection chamber, 31-viewing window;
4-driving motor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like in the description of the present invention, if any, are used for distinguishing between the descriptions and not necessarily for indicating or implying a relative importance.
Furthermore, the terms "horizontal," "vertical," and the like in the description of the present invention, if any, do not denote absolute levels or overhangs, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, embodiment 1 proposes a valve oil seal test device, which includes a dummy cylinder head 1, the dummy cylinder head 1 including a camshaft 13, a plurality of valve guide holes 11, a valve spring (not shown) and a valve rod 12, and further includes:
2, referring to fig. 2 to 6, the number of the collecting pipes 2 corresponds to that of the valve guide pipe holes 11, two axial ends of the collecting pipe 2 respectively form a guide pipe end 21a and an extending end 22b, the guide pipe end 21a penetrates into the corresponding valve guide pipe hole 11, and the extending end 22b extends out of the simulated cylinder cover 1 at one end of the valve guide pipe hole 11, which is away from the camshaft 13; the collecting pipe 2 is also provided with an inner hole which extends along the axis and penetrates through the collecting pipe, the valve rod 12 penetrates into the inner hole, and the conduit end 21a is provided with a test oil seal 14 which is in sealing fit with the valve rod 12;
Referring to fig. 1 and 2, a collecting chamber 3 is disposed below the simulated cylinder cover 1 and has a shape of a closed shell with an inner cavity, an extending end 22b of the collecting pipe 2 extends through the shell of the collecting chamber 3 and penetrates into the inner cavity of the collecting chamber 3 after extending out of the simulated cylinder cover 1, an outer wall of the collecting pipe 2 is in airtight fit with the shell of the collecting chamber 3, a through hole 23 which is disposed between two ends of the collecting pipe 2 and is communicated with the inner cavity of the collecting chamber 3 is formed on the collecting pipe 2, and the inner cavity of the collecting chamber 3 can be established as positive pressure or negative pressure;
The driving device is in transmission connection with a cam shaft 13 of the simulated cylinder cover 1, so that the cam shaft 13 cooperates with a valve spring to drive the valve rod 12 to reciprocate in the inner hole.
In the present embodiment, the simulated cylinder head 1 is mainly used for simulating the actual running condition of the engine cylinder head, and is made of the actual engine cylinder head, while the conduit end 21a of the collecting pipe 2 is equivalent to the valve conduit in the actual engine cylinder head; the rotation of the cam shaft 13 drives the valve rod 12 to move downwards in the valve guide hole 11, the valve spring is sleeved on the valve rod 12 and is abutted against a spring seat of the valve rod 12, and the other end of the valve spring is abutted against the inner wall of the simulated cylinder cover 1, so that the valve spring applies a reset force for upward movement reset to the valve rod 12, and then the valve rod 12 is driven to reciprocate back and forth by being matched with the cam shaft 13, so that the actual working condition of the cylinder cover is simulated.
In the operation process, the driving device is started to drive the cam shaft 13 to rotate, so that the valve rod 12 moves back and forth in a reciprocating mode, meanwhile, different positive and negative pressure environments are established in the inner cavity of the collecting chamber 3, positive and negative pressure is transmitted to the lip of the test oil seal 14 through the through hole 23 on the collecting pipe 2, and then the working condition environment faced by the oil seal under the actual working condition is simulated.
The specific test method comprises the following steps: installing a simulation cylinder cover 1, a collecting pipe 2 and a collecting chamber 3; heating the circulating engine oil of the simulated cylinder cover 1; different positive and negative pressure environments are established in the inner cavity of the collecting chamber 3; the driving device is started, and the oil leakage amount discharged by the extending end 22b of the inner hole under different positive and negative pressure environments is measured to judge the oil leakage condition of the test oil seal 14 under different positive and negative pressure environments.
Compared with the technical scheme of using a vacuum tube to establish positive and negative pressure adopted in the traditional mode, the positive and negative pressure is uniformly established by adopting the more spacious collecting chamber 3, so that the influence of pressure drop is reduced, and the test precision is improved.
In order to observe the oil output of the inner hole, in this embodiment, the oil collecting cup 24 is further included, and the cup mouth end of the oil collecting cup 24 is connected to the extending end 22b of the collecting pipe 2, and the inner cavity of the oil collecting cup 24 is communicated with the inner hole. Meanwhile, the oil collecting cup 24 is transparent, and the collecting chamber 3 is provided with an observation window. This structure makes the experimenter can know the oil leakage of each valve department on the simulation cylinder cap 1 through the observation window and the oil collecting cup 24 directly, and the test result is more direct-viewing.
In this embodiment, to facilitate accurate measurement of the collection amount of the oil collection cup 24, the oil collection cup 24 is threaded between the open end and the protruding end 22b to enable an operator to remove the oil collection cup 24 for measurement.
In addition, as described above, the conduit end 21a of the collecting pipe 2 is constructed to conform to the valve guide in the engine. Obviously, the valve guide structure used by different engines is different. And a set of collecting pipes with specific guide pipe ends are arranged for each type of engine, so that the implementation cost is high.
So in this embodiment, the collecting pipe 2 includes a first pipe body 21 and a second pipe body 22 sequentially arranged along an axial direction thereof, the pipe end 21a is formed on the first pipe body 21, the protruding end 22b is formed on the second pipe body 22, the first pipe body 21 and the second pipe body 22 are detachably connected, more specifically, the first pipe body 21 and the second pipe body 22 are screwed. This double tube structure can save the number of second tubes 22.
In addition, in the present embodiment, the number of the valve guide holes 11 on the simulated cylinder head 1 is 8 to promote the simultaneous test amount of the device.
Regarding the establishment of positive or negative pressure in the interior of the collection chamber 3, in this embodiment, a vacuum pump for establishing positive or negative pressure in the interior of the collection chamber 3 is also included, said vacuum pump being in communication with the interior of said collection chamber 3.
In addition, in the present embodiment, the driving device includes a variable frequency driving motor 4, and an output shaft of the variable frequency driving motor 4 is in transmission connection with a cam shaft 13. The variable frequency driving motor 4 is adopted to drive the cam shaft 13, so that the actual working conditions of the engine at different running speeds can be simulated.
Among them, it is notable that: the test oil seal 14, the valve stem 12, the valve spring and the cam shaft 13 belong to the existing engine structure, and the embodiment is not tired; meanwhile, it is possible for those skilled in the art to select a specific transmission structure (for example, as disclosed in the chinese patent publication CN 201476948U) for driving the output shaft of the driving motor 4 to rotate the cam shaft 13 from the prior art, so that the specific form of the transmission structure will not be described in detail.
More specifically, in this embodiment, the collecting chamber 3 is in a square box shape, and the connection relationship between the top plate forming the top wall of the collecting chamber and the side plates forming the side parts of the collecting chamber is detachable, so that the top plate can be detached together with the engine by an operator when the operator needs to test different engines, and the assembling and disassembling are more convenient.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The valve oil seal testing device comprises a simulation cylinder cover, wherein the simulation cylinder cover comprises a cam shaft and a plurality of valve guide holes, valve springs and valve rods which are formed at the open end of the simulation cylinder cover, and the valve oil seal testing device is characterized by further comprising:
the number of the collecting pipes corresponds to that of the valve guide pipe holes, the two axial ends of the collecting pipes respectively form guide pipe ends and extending ends, the guide pipe ends penetrate into the corresponding valve guide pipe holes, and the extending ends extend out of the simulated cylinder cover at one end, back to the cam shaft, of the valve guide pipe holes; the collecting pipe is also provided with an inner hole which extends along the axis and is communicated with the collecting pipe, the valve rod penetrates into the inner hole and forms transmission with the cam shaft, and the end of the guide pipe is provided with a test oil seal which is in sealing fit with the valve rod;
The collecting chamber is arranged below the simulated cylinder cover and is in a shape of a closed shell with an inner cavity, the open end of the simulated cylinder cover is closed by the top surface of the collecting chamber, the extending end of the collecting pipe penetrates through the shell of the collecting chamber and penetrates into the inner cavity of the collecting chamber after extending out of the simulated cylinder cover, the outer wall of the collecting pipe is in airtight fit with the shell of the collecting chamber, a through hole which is arranged between the two ends of the collecting pipe and is communicated with the inner cavity of the collecting chamber is formed on the collecting pipe, and the inner cavity of the collecting chamber can be established to be positive pressure or negative pressure;
And the driving device is in transmission connection with a cam shaft of the simulated cylinder cover, so that the cam shaft is matched with the valve spring to drive the valve rod to reciprocate in the inner hole.
2. The valve oil seal test device of claim 1, further comprising an oil collection cup in the shape of a cup, wherein the rim end of the oil collection cup is connected to the protruding end of the collection tube, and the inner cavity of the oil collection cup is communicated with the inner hole.
3. The valve oil seal testing device according to claim 2, wherein the oil collecting cup body is transparent, and the collecting chamber is provided with an observation window.
4. The valve oil seal testing device of claim 2, wherein the open end of the oil collection cup is threadably connected to the protruding end.
5. The valve oil seal testing device according to claim 1, wherein the collecting pipe comprises a first pipe body and a second pipe body which are sequentially arranged along the axial direction of the collecting pipe, the conduit end is formed on the first pipe body, the extending end is formed on the second pipe body, and the first pipe body and the second pipe body are detachably connected.
6. The valve oil seal testing apparatus of claim 5, wherein the first tube body and the second tube body are threadably connected.
7. The valve oil seal testing apparatus of claim 1, wherein the number of valve guide holes in the dummy cylinder head is 8.
8. The valve oil seal test apparatus of claim 1, further comprising a vacuum pump for establishing positive or negative pressure within the interior chamber of the collection chamber, said vacuum pump in communication with the interior chamber of the collection chamber.
9. The valve oil seal testing device according to claim 1, wherein the driving device comprises a variable frequency driving motor, and an output shaft of the variable frequency driving motor is in transmission connection with a cam shaft.
10. The method of testing a valve oil seal testing apparatus according to claim 1, comprising the steps of:
installing a simulation cylinder cover, a collecting pipe and a collecting chamber;
heating the circulating engine oil of the simulated cylinder cover;
establishing different positive and negative pressure environments in the inner cavity of the collecting chamber;
And starting the driving device, and measuring the oil leakage amount discharged by the extending end of the inner hole under different positive and negative pressure environments to judge the oil leakage condition of the test oil seal under different positive and negative pressure environments.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110062871.6A CN112729715B (en) | 2021-01-18 | 2021-01-18 | Valve oil seal test device and test method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110062871.6A CN112729715B (en) | 2021-01-18 | 2021-01-18 | Valve oil seal test device and test method thereof |
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| CN112729715A CN112729715A (en) | 2021-04-30 |
| CN112729715B true CN112729715B (en) | 2024-07-02 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213985577U (en) * | 2021-01-18 | 2021-08-17 | 成都盛帮密封件股份有限公司 | Valve oil seal testing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2948126B2 (en) * | 1995-05-01 | 1999-09-13 | 株式会社荒井製作所 | Test equipment for valve stem seal |
| CN101581628B (en) * | 2009-07-03 | 2011-01-05 | 成都盛帮密封件有限公司 | Engine valve oil seal test stand |
| CN102192821B (en) * | 2011-03-04 | 2012-11-07 | 青岛开世密封工业有限公司 | Oil leakage characteristic test machine for valve guide rod oil seal and test method thereof |
| KR101635370B1 (en) * | 2016-02-16 | 2016-07-01 | 부림자동화(주) | Hydraulic cylinder inside oil leakage measuring equipment and the measuring methods |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213985577U (en) * | 2021-01-18 | 2021-08-17 | 成都盛帮密封件股份有限公司 | Valve oil seal testing device |
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