Tool for testing oil pumping quantity of crankcase ventilation system of internal combustion engine

Abstract

The utility model discloses a tool for testing the oil pumping amount of a crankcase ventilation system of an internal combustion engine. An upper assembly and a lower assembly are in a hollow straight cylinder shape. The top of the upper assembly is sealed, the bottom of the upper assembly is open, an air outlet pipe is arranged on the outer side face of the upper assembly and close to the top of the upper assembly, and a first flange is arranged at the bottom of the upper assembly around the outer side face of the upper assembly. The bottom of the lower assembly is sealed, the top of the lower assembly is open, an air inlet pipe is arranged on the upper middle portion of the outer side face of the lower assembly, a second flange corresponding to the first flange is arranged around the outer side face of the lower assembly and on the top of the lower assembly, and a plurality of first connecting pieces are arranged on the first flange and / or the second flange so that the upper assembly and the lower assembly can be fixed together. A circle of groove is formed in the top of the second flange and surrounds the inner side wall of the lower assembly, and an O-shaped ring is arranged in the groove to seal the upper assembly and the lower assembly; the filter element is in a sheet shape, is arranged on the second flange and completely covers the hollow part of the lower assembly. The tool is wide in test range and accurate in test result.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of internal combustion engine auxiliary equipment, in particular to a kind of tooling of testing internal combustion engine crankcase ventilation system oil leakage amount. BACKGROUND

[0002] When internal combustion engine works, there are high-pressure combustible mixture and burned gas in combustion chamber, which will leak into crankcase through the gap between piston group and cylinder, causing blow-by gas.The composition of blow-by gas is unburned fuel gas, water vapor and exhaust gas, which will dilute oil, reduce the performance of oil, accelerate oxidation and deterioration of oil.Water vapor condenses in oil, forming sludge and blocking oil way;acidic gas in exhaust gas mixes into lubrication system, causing corrosion and accelerated wear of engine parts;blow-by gas will also make the pressure of crankcase too high, damaging the seal of crankcase and causing oil leakage.

[0003] To prevent the pressure of crankcase from being too high, prolong the service life of oil, reduce the wear and corrosion of parts and prevent engine from leaking, crankcase ventilation must be implemented.In addition, to meet the increasingly stringent emission requirements and improve economy, crankcase ventilation system design must also be carried out during the design of automobile engine, and the oil leakage amount of crankcase ventilation system must be controlled within a certain range.In order to test the oil leakage amount of crankcase ventilation system, the tooling currently used can only collect oil mist contained in crankcase blow-by gas, and direct blow-out of clear oil cannot be collected, which will directly leak to the ground, and due to the problem of poor sealing, it cannot be used for crankcase ventilation system with closed structure (structure in which crankcase blow-by gas is connected to engine intake pipe through pipeline and enters cylinder for re-combustion).

[0004] The disclosure of the above background art content is only used to assist in understanding the concept and technical scheme of the utility model, which does not necessarily belong to the prior art of the present patent application, and the above background art should not be used to evaluate the novelty and creativity of the present application without clear evidence that the above content has been disclosed on the filing date of the present patent application. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of tooling of testing internal combustion engine crankcase ventilation system oil leakage amount, to solve the technical problems that the tooling of the above prior art cannot collect clear oil blown out by crankcase ventilation system, and cannot be used for closed structure.

[0006] Therefore, the utility model provides a kind of tooling of testing internal combustion engine crankcase ventilation system oil leakage amount.

[0007] Preferably, the utility model can also have the following technical features:

[0008] The utility model provides a tool for testing the oil leakage of the ventilation system of the crankcase of an internal combustion engine, comprising an upper assembly, a lower assembly and a filter element, the upper assembly and the lower assembly being hollow straight cylinders;

[0009] The upper assembly is sealed at the top and open at the bottom, an air outlet pipe is arranged on the outer side of the upper assembly near the top of the upper assembly, and a first flange is arranged around the outer side of the upper assembly at the bottom of the upper assembly.

[0010] The lower assembly is sealed at the bottom and open at the top, an air inlet pipe is arranged on the upper middle part of the outer side of the lower assembly, a second flange corresponding to the first flange is arranged around the outer side of the lower assembly at the top of the lower assembly, a plurality of first connecting members are arranged on the first flange and / or the second flange to fix the upper assembly and the lower assembly together, a ring of grooves is arranged around the inner side wall of the lower assembly at the top of the second flange, and an O-ring is arranged in the grooves to seal the upper assembly and the lower assembly.

[0011] The filter element is in the shape of a sheet and is arranged on the second flange and covers the hollow part of the lower assembly.

[0012] Preferably, a lifting lug is arranged in the middle of the top of the upper assembly.

[0013] Preferably, a plurality of second connecting members are used to connect the lifting lug and the upper assembly, and the second connecting members are bolts or buckles.

[0014] Preferably, the lifting lug is welded to the top of the upper assembly.

[0015] Preferably, the air outlet pipe and the air inlet pipe are directed in the same direction.

[0016] Preferably, the hollow parts of the upper assembly and the lower assembly are both in the shape of a cylinder, and the diameters of the cylinders are the same.

[0017] Preferably, all the edges of the filter element are located on the second flange and within the circular grooves.

[0018] Preferably, the filter element is in the shape of a circle and is coaxial with the lower assembly.

[0019] Preferably, the air outlet pipe and the first flange have a certain height difference.

[0020] The beneficial effects of the utility model in comparison with the prior art include: the utility model refers to the tool, which is provided with an air outlet pipe on the upper assembly, an air inlet pipe on the upper part of the lower assembly, and a filter element which completely covers the hollow part of the lower assembly between the upper assembly and the lower assembly, so that the tool can not only collect the oil mist contained in the blow-by gas of the crankcase through the filter element, but also collect the clear oil which is blown out in the hollow part below the air inlet pipe of the lower assembly, thereby avoiding direct spilling of the clear oil, and the tool can almost completely collect the oil blown out by the ventilation system of the crankcase, which makes the test result more accurate; the upper assembly and the lower assembly are assembled together through the first flange and the second flange, and the O-ring is arranged on the second flange, so that the sealing property of the tool is improved, and the tool is suitable for testing the ventilation system of the crankcase with natural ventilation and closed ventilation structures. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is an exploded view of the embodiment of the utility model.

[0022] Figure 2 is an installation schematic view of the embodiment of the utility model.

[0023] Figure 3 is a structure schematic view of the natural ventilation structure of the embodiment of the utility model.

[0024] Figure 4 is a structure schematic view of the closed ventilation structure of the embodiment of the utility model.

[0025] The reference signs are explained as follows: 1-upper assembly; 11-air outlet pipe; 12-first flange; 2-lower assembly; 21-air inlet pipe; 22-second flange; 23-groove; 3-filter element; 4-first connecting piece; 5-O-ring; 6-lifting lug; 7-internal combustion engine; 8-pipe; 9-crankcase air outlet; 10-internal combustion engine air inlet. DETAILED DESCRIPTION

[0026] The utility model will be further explained in detail in combination with the specific embodiments and by referring to the drawings. It should be emphasized that the following description is only exemplary and is not intended to limit the scope of the utility model and its applications.

[0027] The non-limiting and non-exclusive embodiments will be described by referring to the following drawings, in which the same reference signs represent the same parts unless otherwise specifically stated.

[0028] A tool for testing the blow-by oil amount of the ventilation system of the crankcase of an internal combustion engine, such as Figure 1 and 2As shown, including the upper assembly 1, the lower assembly 2 and the filter core 3, the upper assembly 1 and the lower assembly 2 are hollow straight cylindrical; the upper assembly 1 is sealed at the top and open at the bottom, the air outlet pipe 11 is arranged on the outer side of the upper assembly 1 near the top of the upper assembly 1, and the first flange 12 is arranged around the outer side of the upper assembly 1 at the bottom of the upper assembly 1; the lower assembly 2 is sealed at the bottom and open at the top, the air inlet pipe 21 is arranged on the outer side of the lower assembly 2 at the middle upper part, the second flange 22 corresponding to the first flange 12 is arranged around the outer side of the lower assembly 2 at the top of the lower assembly 2, a plurality of first connecting pieces 4 are arranged on the first flange 12 and / or the second flange 22, specifically, the first connecting pieces 4 can be bolts or buckles, and four bolts are used in this example to fix the upper assembly 1 and the lower assembly 2 together, a circle of grooves 23 is arranged around the inner side wall of the lower assembly 2 at the top of the second flange 22, and an O-ring 5 is arranged in the groove 23 to seal the upper assembly 1 and the lower assembly 2; the filter core 3 is in the form of a sheet and is arranged on the second flange 22 and covers the hollow part of the lower assembly 2 completely.

[0029] The above tool sets the air outlet pipe 11 on the upper assembly 1, sets the air inlet pipe 21 in the middle upper part of the lower assembly 2, and sets the filter core 3 which completely covers the hollow part of the lower assembly 2 between the upper assembly 1 and the lower assembly 2, so that the tool not only collects the oil mist contained in the crankcase blow-by gas through the filter core 3, but also collects the clear oil together in the hollow part below the air inlet pipe 21 of the lower assembly 2 to avoid direct spilling of the clear oil. The tool can almost completely collect the oil blown out of the crankcase ventilation system, which makes the test result more accurate; the upper assembly 1 and the lower assembly 2 are assembled together through the first flange 12 and the second flange 22, and the O-ring 5 is arranged on the second flange 22 to improve the sealing of the tool as a whole, so that the tool is suitable for testing the crankcase ventilation system of both natural ventilation and closed ventilation structures.

[0030] As shown in Figure 3 The crankcase ventilation system of the internal combustion engine 7 of this example is of a natural ventilation structure, the air inlet pipe 21 of the tool is connected with the crankcase air outlet 9 through the pipeline 8, the internal combustion engine 7 is operated at a specified test operating point, the blow-by gas enters the tool from the air inlet pipe 21 through the pipeline 8 from the crankcase air outlet 9, the clear oil naturally flows down and is retained in the hollow part below the air inlet pipe 21, and the oil mist enters the hollow part of the upper assembly 1 after being filtered by the filter core, and finally is discharged into the atmosphere through the air outlet pipe 11.

[0031] As shown in Figure 4As shown, the crankcase ventilation system of the internal combustion engine in this example is of a closed ventilation structure, the intake pipe 21 of the tool is connected with the crankcase gas outlet 9 through the pipeline 8, the internal combustion engine 7 is operated at a designated test operating point, the blow-by gas from the crankcase gas outlet 9 enters the tool from the intake pipe 21 through the pipeline 8, the bright oil flows down naturally and is stored in the hollow part below the intake pipe 21, the oil mist enters the hollow part of the upper assembly 1 after being filtered by the filter element, and finally enters the cylinder from the air inlet 10 of the internal combustion engine through the pipeline 8 and the gas outlet pipe 11 for combustion again.

[0032] In some examples of this embodiment, a lifting lug 6 is arranged in the middle of the top of the upper assembly 1, which is used to lift the entire tool during testing, so that the intake pipe 21 of the tool and the gas outlet 9 of the crankcase are kept in a straight line as much as possible, which facilitates testing and improves the accuracy of testing. Specifically, a plurality of second connecting members can be used to connect the lifting lug 6 with the upper assembly 1, which can be bolts, or the lifting lug 6 can be directly welded to the top of the upper assembly 1.

[0033] In other examples of this embodiment, the gas outlet pipe 11 and the intake pipe 21 are directed in the same direction to facilitate the connection of the pipeline 8 when the tool is used for testing.

[0034] In other examples of this embodiment, the hollow parts of the upper assembly 1 and the lower assembly 2 are both cylindrical, and the diameters of the cylinders are the same, which facilitates cleaning of the tool after testing.

[0035] In other examples of this embodiment, all edges of the filter element 3 are located on the second flange 22, so that the second flange 22 supports the filter element 3 and prevents the filter element 3 from falling into the control part of the lower assembly 2 during testing; all edges of the filter element 3 are located inside the groove 23, that is, the O-ring 5 is arranged outside the filter element 3, which prevents the oil mist on the filter element 3 from escaping from the connection between the upper assembly 1 and the lower assembly 2, thereby affecting the test results. Specifically, the filter element can be circular and coaxial with the lower assembly.

[0036] In other examples of this embodiment, the gas outlet pipe 11 and the first flange 12 have a certain height difference, so that there is a certain storage space for the oil mist entering from the intake pipe 21 after passing through the filter element 3, so that the airflow is relatively stable, and the oil mist uniformly passes through the filter element 3, thereby preventing the oil mist from passing through only the filter element 3 near the gas outlet pipe 11, which causes some filter elements 3 to absorb too much oil and reach the maximum oil absorption capacity too early, thereby affecting the final test results.

[0037] The testing principle of the above tooling is: before testing, the whole tooling is weighed, and the weight before testing is recorded as M1; the air inlet pipe 21 is connected to the crankcase outlet 9 of the internal combustion engine 7; if the crankcase ventilation system of the internal combustion engine 3 is natural ventilation, the outlet pipe 11 of the tooling does not need to be connected to the pipe 8, and can be directly connected to the atmosphere; if the crankcase ventilation system of the internal combustion engine 3 is closed ventilation, the outlet pipe 11 is connected to the air inlet 10 of the internal combustion engine, so that the internal combustion engine 3 is operated at a specified testing operating point; after testing for a certain time, the whole tooling is removed, and the whole tooling after testing is weighed, and the weight after testing is recorded as M2; and the crankcase blowby oil amount m = M2-M1.

[0038] Those skilled in the art will recognize that numerous modifications can be made to the above description while still falling within the scope of the present application, and that the examples and figures are merely used to describe one or more particular embodiments.

[0039] While there have been described herein the principles of the present application, it is to be understood by those skilled in the art that other changes can be made to the application without departing from the scope of the present application. It is therefore desired that the present application be measured not by the embodiments described herein, but by the scope of the claims appended hereto.

Claims

1. A tool for testing the amount of blow-by in a ventilation system of a crankcase of an internal combustion engine, characterized in that: The filter comprises an upper assembly, a lower assembly and a filter core, wherein the upper and lower assemblies are hollow straight cylindrical in shape. The upper assembly is sealed at the top and open at the bottom, and an air outlet pipe is arranged on the outer side of the upper assembly near the top of the upper assembly, and a first flange is arranged around the outer side of the upper assembly at the bottom of the upper assembly. The lower assembly is sealed at the bottom and open at the top, and an air inlet pipe is arranged on the outer side of the lower assembly at the middle upper part, and a second flange corresponding to the first flange is arranged around the outer side of the lower assembly at the top of the lower assembly, a plurality of first connecting members are arranged on the first flange and / or the second flange to fix the upper assembly and the lower assembly together, a groove is arranged around the inner side wall of the lower assembly at the top of the second flange, and an O-ring is arranged in the groove to seal the upper assembly and the lower assembly. The filter core is in the shape of a sheet and is arranged on the second flange and covers the hollow part of the lower assembly.

2. A tool for testing the oil blowby of an internal combustion engine crankcase ventilation system according to claim 1, characterized in that: A lifting lug is arranged in the middle of the top of the upper assembly.

3. A tool for testing the oil blowby of an internal combustion engine crankcase ventilation system according to claim 2, characterized in that: A plurality of second connecting members are used to connect the lifting lug and the upper assembly, and the second connecting members are bolts.

4. The tool for testing the oil blowby of an internal combustion engine crankcase ventilation system according to claim 2, characterized in that: The lifting lug is welded to the top of the upper assembly.

5. The tooling for testing the oil blowby of an internal combustion engine crankcase ventilation system of claim 1, wherein: The air outlet pipe and the air inlet pipe are directed in the same direction.

6. The tooling for testing the oil recirculation rate of an internal combustion engine crankcase ventilation system of claim 1, wherein: The hollow parts of the upper assembly and the lower assembly are both in the shape of a cylinder, and the diameters of the cylinders are the same.

7. The tooling for testing the oil blowby of an internal combustion engine crankcase ventilation system of claim 1, wherein: All edges of the filter core are located on the second flange and in the groove.

8. A tool for testing the oil blowby of an internal combustion engine crankcase ventilation system according to claim 7, characterized in that: The filter core is circular, and the filter core is coaxial with the lower assembly.

9. The tooling for testing the oil recirculation of an internal combustion engine crankcase ventilation system according to claim 1, characterized in that: The air outlet pipe has a certain height difference from the first flange.

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