Engine crankcase ventilation system

Abstract

The utility model provides an engine crankcase ventilation system. The engine crankcase ventilation system comprises a cylinder head cover, a cooling and filtering assembly and a pressure adjusting assembly. The cooling filter assembly comprises a baffle and at least two metal filter screens, the baffle and the cylinder head cover are combined to form a cooling circulation channel, an inlet is formed in one end of the cooling circulation channel, and all the metal filter screens are located at the other end of the cooling circulation channel; the pressure regulating assembly is used for discharging oil steam filtered by the metal filter screen and comprises a pressure relief boss, a pressure relief structure and an exhaust pipe, the side portion of the pressure relief boss communicates with the exhaust pipe, a pressure relief opening is formed in the top of the pressure relief boss, the pressure relief structure is movably connected with the top of the pressure relief boss, and the pressure relief structure is used for blocking or opening the pressure relief opening. The pressure relief boss is provided with an air inlet hole used for air inflow. By means of the engine oil filtering device, the filtering efficiency can be improved, the engine oil loss amount is reduced, and the problem that oil leaks from multiple positions due to the fact that the internal pressure of an engine is too large can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, and particularly relates to an engine crankcase ventilation system. Background Art

[0002] When the engine is working, a part of the combustible mixture and exhaust gas always leak into the crankcase through the piston rings. After the gasoline vapor in the crankcase condenses, the engine oil will become thinner and its performance will deteriorate. Moreover, due to the leakage of the combustible mixture and exhaust gas into the crankcase, the pressure in the crankcase will increase, and the engine oil may leak out from the crankshaft oil seal, crankcase gasket, etc. The engine oil vapor lost into the atmosphere will increase the pollution of the engine to the atmosphere. Installing a crankcase ventilation device on the engine can avoid or mitigate the above phenomena.

[0003] At present, for most existing diesel engine crankcase ventilation systems, due to the limited internal space of the engine, there is only one filter screen or no filter screen inside the engine, and the filtration efficiency is not high. At the same time, the oil vapor passage path is relatively short, and the high-temperature oil vapor cannot be fully cooled, resulting in the necessity of adding a special oil-gas separation device outside the engine, which increases the overall cost of the engine. Summary of the Utility Model

[0004] Based on this, the purpose of the utility model is to provide an engine crankcase ventilation system to solve the deficiencies in the prior art.

[0005] To achieve the above purpose, the utility model provides an engine crankcase ventilation system, which includes a cylinder head cover, a cooling and filtering assembly and a pressure regulating assembly arranged in the cylinder head cover;

[0006] The cooling and filtering assembly includes a baffle and at least two metal filter screens. The baffle and the cylinder head cover form a cooling flow channel together. One end of the cooling flow channel is provided with an inlet for allowing oil vapor to enter, and each metal filter screen is located at the other end of the cooling flow channel;

[0007] The pressure regulating assembly is located on one side of the metal filter screen. The pressure regulating assembly is used for discharging the oil vapor filtered by the metal filter screen. The pressure regulating assembly includes a pressure relief boss, a pressure relief structure and an exhaust pipe. The side part of the pressure relief boss is communicated with the exhaust pipe. A pressure relief port is arranged at the top of the pressure relief boss. The pressure relief structure is movably connected to the top of the pressure relief boss. The pressure relief structure is used for blocking or opening the pressure relief port. Among them, an air inlet hole for air intake is arranged on the pressure relief boss.

[0008] The beneficial effects of the present utility model are as follows: A cooling circulation channel is formed by combining a baffle plate and a cylinder head cover. An inlet for oil vapor to enter is provided at one end of the cooling circulation channel, and a metal filter screen is arranged at the other end of the cooling circulation channel. The oil vapor enters the cooling circulation channel through the inlet, and the high-temperature oil vapor is cooled by the cooling circulation channel. Then, the cooled oil vapor is filtered by at least two metal filter screens to improve the filtering efficiency and reduce the amount of oil loss. A pressure regulating component is arranged on one side of the metal filter screen. When the pressure of the oil vapor is not high, the filtered oil vapor enters the pressure relief boss through the air inlet hole, and then the oil vapor is discharged through the exhaust pipe. When the pressure of the oil vapor is too high, the pressure relief structure assists in discharging the oil vapor entering the pressure relief boss, so that the oil vapor is discharged from the side and top of the pressure relief boss simultaneously to achieve the purpose of pressure relief, thereby improving the problem of oil leakage at multiple positions caused by excessive internal pressure of the engine.

[0009] Preferably, the interior of the pressure relief boss is hollow to form a receiving space, and both the pressure relief port and the air inlet hole communicate with the receiving space.

[0010] Preferably, the metal filter screen is connected to the baffle plate through a fixing bracket, and the baffle plate is connected to the cylinder head cover through a riveting structure.

[0011] Preferably, the number of the metal filter screens is two, and the two metal filter screens sequentially filter the oil vapor flowing into the cooling circulation channel through the inlet.

[0012] Preferably, a sinking groove is formed at the top of the pressure relief boss, so that a step is formed at the top of the pressure relief boss. The sinking groove surrounds the pressure relief port and communicates with the pressure relief port.

[0013] Preferably, the pressure relief structure includes a pressure relief spring and a metal diaphragm. One end of the pressure relief spring is connected to the step, and the other end of the pressure relief spring is connected to the metal diaphragm. The metal diaphragm is movably connected to the cylinder head cover, so that when the metal diaphragm covers the pressure relief port, the receiving space becomes a closed space.

[0014] Preferably, the metal diaphragm is in a U-shaped structure and is inverted on the top of the pressure relief boss.

[0015] Preferably, a cover plate is arranged on the cylinder head cover, and the cover plate covers a part of the space above the metal diaphragm.

[0016] Preferably, the cover plate is detachably connected to the cylinder head cover through fixing bolts.

[0017] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the engine crankcase ventilation system provided by an embodiment of the present utility model;

[0019] Figure 2 It is a front view of the engine crankcase ventilation system provided by an embodiment of the present utility model;

[0020] Figure 3 is Figure 2 an enlarged view of part A in

[0021] Figure 4 It is a cross-sectional view of the pressure relief component provided by an embodiment of the present utility model.

[0022] Description of the main component symbols:

[0023] 10. Cylinder head cover; 21. Baffle; 22. Metal filter screen; 23. Cooling flow channel; 24. Inlet; 31. Pressure relief boss; 311. Air inlet hole; 312. Accommodating space; 313. Cover plate; 314. Fixing bolt; 32. Exhaust pipe; 33. Pressure relief spring; 34. Metal diaphragm; 36. Steel sheet; 40. Fixing bracket.

[0024] The following specific embodiments will further illustrate the present utility model in conjunction with the above-mentioned drawings. Specific Embodiments

[0025] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present utility model are given in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used herein in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] Please refer to Figures 1 to 4 , which is the engine crankcase ventilation system in the embodiment of the present utility model, including a cylinder head cover 10, a cooling and filtering assembly, and a pressure regulating assembly.

[0029] Among them: The cooling and filtering assembly and the pressure regulating assembly are both arranged in the cylinder head cover 10. The cooling and filtering assembly includes a baffle 21 and two metal filters 22. The baffle 21 and the cylinder head cover 10 form a cooling flow channel 23. One end of the cooling flow channel 23 is provided with an inlet 24 for allowing oil vapor to enter. The two metal filters 22 are both located at the other end of the cooling flow channel 23. The length of the cooling flow channel 23 is greater than half of the length of the cylinder cover. The two metal filters 22 are respectively a primary metal filter 22 and a secondary metal filter 22. The high-temperature oil vapor enters the cooling flow channel 23 through the inlet 24, is cooled through the cooling flow channel 23, and then is filtered through the primary metal filter 22 and the secondary metal filter 22 in sequence. At this time, most of the liquid oil vapor in the oil vapor is intercepted by the metal filter 22 and flows back into the engine along the cooling flow channel 23, while the gaseous oil vapor continues to move forward through the metal filter 22.

[0030] In the embodiment, both the primary metal filter 22 and the secondary metal filter 22 are connected to the baffle 21 through a fixing bracket 40. The baffle 21 is connected to the cylinder head cover 10 through a riveting structure. This riveting structure is a prior art and will not be elaborated here.

[0031] In this embodiment, the pressure regulating assembly is located on one side of the metal filter 22. The pressure regulating assembly is used to discharge the oil vapor filtered by the metal filter 22. Specifically, the pressure regulating assembly includes a pressure relief boss 31, a pressure relief structure, and an exhaust pipe 32. A connection hole is opened on the side of the pressure relief boss 31. The pressure relief boss 31 is communicated with the exhaust pipe 32 through the connection hole. A pressure relief port is arranged at the top of the pressure relief boss 31. The pressure relief structure is movably connected to the top of the pressure relief boss 31. The pressure relief structure is used to block or open the pressure relief port. An air inlet hole 311 for air intake is arranged on the pressure relief boss 31. The pressure relief boss 31 and the cylinder head cover 10 are integrally formed by die casting. It can be understood that in other embodiments, the end of the exhaust pipe 32 far from the pressure relief boss 31 is connected to the next-stage oil-gas separator to further process the oil vapor and then discharge it into the atmosphere.

[0032] It should be noted that when the pressure of the oil vapor is not high, the filtered oil vapor enters the pressure relief boss 31 through the air inlet hole 311, and then the oil vapor is discharged through the exhaust pipe 32, and the pressure relief structure does not work; when the pressure of the oil vapor is too high, the pressure relief structure is used to assist in discharging the oil vapor entering the pressure relief boss 31. At this time, part of the oil vapor will also be discharged through the exhaust pipe 32, so that the oil vapor is discharged from both the side and the top of the pressure relief boss 31 to achieve the purpose of pressure relief.

[0033] In this embodiment, the inside of the pressure relief boss 31 is hollow to form a receiving space 312. The pressure relief port, the air inlet hole 311, and the connection hole are all communicated with the receiving space 312. A sunken groove is formed at the top of the pressure relief boss 31. The sunken groove surrounds the pressure relief port and is communicated with the pressure relief port, so that a step is formed at the top of the pressure relief boss.

[0034] In this embodiment, the pressure relief structure includes a pressure relief spring 33 and a metal diaphragm 34. One end of the pressure relief spring 33 is embedded in the sunken groove and part of the pressure relief port, and the pressure relief spring 33 is connected to the step. The other end of the pressure relief spring 33 is limited within the metal diaphragm 34, and the pressure relief spring 33 is connected to the metal diaphragm 34 to limit and fix the pressure relief spring 33. It should be noted that the metal diaphragm 34 is of a U-shaped structure. The metal diaphragm 34 is inverted on the top of the pressure relief boss 31. When the metal diaphragm 34 covers the pressure relief port, the receiving space 312 is a closed space, and the metal diaphragm 34 is movably connected to the cylinder head cover 10.

[0035] It should be noted that the metal diaphragm 34 is connected to the cylinder head cover 10 through a steel sheet 36. A rubber pad is arranged at the bottom of the metal diaphragm 34. The rubber pad abuts against the top of the pressure relief boss 31 to improve the sealing performance of the closed space. At the same time, it can also play a certain protective role for the bottom of the metal diaphragm 34 and the top of the pressure relief boss 31.

[0036] It should be noted that when the metal diaphragm 34 is in the initial position, the rubber pad abuts against the top of the pressure relief boss 31, the pressure relief spring 33 is in a compressed state, and the end of the steel sheet 36 away from the metal diaphragm 34 is inclined upward. When the pressure of the oil vapor is too high, with the auxiliary action of the pressure relief spring 33, the oil vapor lifts the metal diaphragm 34, so that the pressure relief port is communicated with the outside, and the oil vapor can be discharged through the pressure relief port. At this time, the steel sheet 36 deforms.

[0037] In this embodiment, a cover plate 313 is arranged on the cylinder head cover 10. The cover plate 313 covers a part of the space above the metal diaphragm 34 to provide a displacement space for the metal diaphragm 34. The cover plate 313 is detachably connected to the cylinder head cover 10 through a fixing bolt 314 for maintaining the pressure relief structure. Among them, a first through hole is formed in the cover plate 313, a second through hole is formed at one end of the steel sheet 36, and a threaded hole is formed in the cylinder head cover 10. After the fixing bolt 314 passes through the first through hole and the second through hole in sequence, it is threadedly connected to the threaded hole.

[0038] In specific implementation, a cooling flow channel 23 is formed by combining a baffle plate 21 and a cylinder head cover 10. An inlet 24 for oil vapor to enter is provided at one end of the cooling flow channel 23, and a metal filter screen 22 is arranged at the other end of the cooling flow channel 23. The oil vapor enters the cooling flow channel 23 through the inlet 24, and the cooling flow channel 23 is used to cool the high-temperature oil vapor. Then, the cooled oil vapor is filtered by at least two metal filter screens 22 to improve the filtration efficiency and reduce the amount of oil loss. A pressure regulating component is arranged on one side of the metal filter screen 22. When the pressure of the oil vapor is not high, the filtered oil vapor enters the pressure relief boss 31 through the air inlet hole 311, and then the oil vapor is discharged through the exhaust pipe 32. When the pressure of the oil vapor is too high, the pressure relief structure is used to assist in discharging the oil vapor entering the pressure relief boss 31, so that the oil vapor is discharged from the side and top of the pressure relief boss 31 simultaneously to achieve the purpose of pressure relief, and to improve the problem of oil leakage at multiple positions caused by excessive internal pressure of the engine.

[0039] It should be noted that the above implementation process is only to illustrate the feasibility of the present application, but this does not mean that the engine crankcase ventilation system of the present application has only the above-mentioned unique implementation process. On the contrary, as long as the engine crankcase ventilation system of the present application can be implemented, it can be included in the feasible implementation solutions of the present application.

[0040] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An engine crankcase ventilation system, characterized in that: It includes a cylinder head cover, a cooling filter assembly and a pressure regulating assembly arranged in the cylinder head cover; The cooling filter assembly includes a baffle and at least two metal filters, wherein the baffle and the cylinder head cover are combined to form a cooling flow channel, one end of the cooling flow channel is provided with an inlet for oil vapor to enter, and each of the metal filters is located at the other end of the cooling flow channel; The pressure regulating assembly is located on one side of the metal filter, and is used to discharge the oil vapor filtered by the metal filter. The pressure regulating assembly includes a pressure relief boss, a pressure relief structure and an exhaust pipe. The side of the pressure relief boss is connected to the exhaust pipe, and a pressure relief port is provided on the top of the pressure relief boss. The pressure relief structure is movably connected to the top of the pressure relief boss, and the pressure relief structure is used to block or open the pressure relief port, wherein an air intake hole for air intake is provided on the pressure relief boss.

2. The engine crankcase ventilation system according to claim 1, characterized in that: The inner hollow of the pressure relief boss forms a receiving space, and the pressure relief port and the air inlet are both connected to the receiving space.

3. The engine crankcase ventilation system according to claim 1, characterized in that: The metal filter is connected to the baffle through a fixing bracket, and the baffle is connected to the cylinder head cover through a riveting structure.

4. The engine crankcase ventilation system according to claim 1, characterized in that: The number of the metal filters is two, and the two metal filters sequentially filter the oil vapor flowing into the cooling circulation channel through the inlet.

5. The engine crankcase ventilation system according to claim 2, characterized in that: A sinking groove is provided on the top of the pressure relief boss to form a step on the top of the pressure relief boss. The sinking groove is arranged around the pressure relief port, and the sinking groove is communicated with the pressure relief port.

6. The engine crankcase ventilation system according to claim 5, characterized in that: The pressure relief structure includes a pressure relief spring and a metal diaphragm, one end of the pressure relief spring is connected to the step, the other end of the pressure relief spring is connected to the metal diaphragm, and the metal diaphragm is movably connected to the cylinder head cover so that when the metal diaphragm covers the pressure relief port, the accommodating space becomes a closed space.

7. The engine crankcase ventilation system according to claim 6, characterized in that: The metal diaphragm is a U-shaped structure, and the metal diaphragm is inverted on the top of the pressure relief boss.

8. The engine crankcase ventilation system according to claim 6, characterized in that: The cylinder head cover is provided with a cover plate, and the cover plate covers a part of the space above the metal diaphragm.

9. The engine crankcase ventilation system according to claim 8, characterized in that: The cover plate is detachably connected to the cylinder head cover via fixing bolts.

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