Engine ventilation system

Abstract

The present invention discloses a ventilation system of an engine, which has an oil-gas separator, an oil return pipe, a ventilation pipe and an oil suction pump. The ventilation system includes a crankcase, an oil suction pump, an oil pan oil collection area, an integrated oil tank, a cylinder head cover and a first oil-gas passage. The oil suction pump is arranged in the oil pan of the engine, and is used to suck the engine oil from the oil pan; the oil pan oil collection area is located at the lower part of the crankcase; the integrated oil tank is located on both sides of the upper part of the crankcase; the cylinder head cover is arranged on the cylinder head; the first oil-gas passage is connected between the cylinder head cover and the top of the integrated oil tank; when the oil suction pump sucks the engine oil from the oil pan oil collection area to the integrated oil tank, a part of the oil and gas will be sucked into the integrated oil tank at the same time, thereby forcing the oil and gas pressure on the upper part of the integrated oil tank to increase, and the oil and gas will be discharged into the cylinder head cover through the first oil-gas passage faster. Because the oil pan oil collection area and the integrated oil tank are added, the oil and gas can be quickly discharged into the cylinder head cover through the oil-gas passage.

Description

Technical Field

[0001] The invention relates to the field of internal combustion engines, in particular to a ventilation system of a V-type engine. Background Art

[0002] When the engine is working, the high-pressure combustible mixture and burned gas in the combustion chamber will more or less leak into the crankcase through the gap between the piston group and the cylinder, which will cause blowby and dilute the engine oil, thereby reducing the performance of the engine oil. In order to prevent the crankcase pressure from being too high and extend the service life of the engine oil, crankcase ventilation must be implemented. The method commonly used at present is to set a ventilation pipe on the crankcase. When the pressure in the crankcase increases, the gas leaked into the crankcase is discharged through the ventilation pipe. Generally, the ventilation pipe is set on the cylinder head cover and connected to the crankcase through an oil return pipe or a push rod hole. The basic principle of its ventilation system is as follows: Figure 1 shown.

[0003] In dry sump engines where the oil storage tank and oil suction tank are integrated into the oil sump and the engine body, ventilation of the oil storage tank and crankcase must be ensured. The oil storage tank and crankcase are divided into two separate areas. When the pressure in the two areas increases, the gas in them is discharged through the ventilation pipe. However, the traditional crankshaft ventilation system can only realize the crankshaft ventilation of the crankcase, but cannot meet the ventilation requirements of the oil storage tank. Therefore, it is urgent to solve the ventilation system problem after the new engine integrates the dry sump function.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a ventilation system for an engine, which is provided with an oil pan oil collecting area and an integrated oil tank, so that oil and gas can be quickly discharged into a cylinder head cover through an oil and gas channel.

[0006] To achieve the above-mentioned purpose, the present invention provides a ventilation system of an engine, which has an oil-gas separator, an oil return pipe, a ventilation pipe and an oil suction pump, and the ventilation system includes a crankcase, an oil suction pump, an oil pan oil collection area, an integrated oil tank, a cylinder head cover and a first oil-gas passage. The oil suction pump is arranged in the oil pan of the engine, and is used to suck the engine oil from the oil pan; the oil pan oil collection area is located at the lower part of the crankcase; the integrated oil tank is located on both sides of the upper part of the crankcase; the cylinder head cover is arranged on the cylinder head; the first oil-gas passage is connected between the cylinder head cover and the top of the integrated oil tank; when the oil suction pump sucks the engine oil from the oil pan oil collection area to the integrated oil tank, it will also suck a part of the oil and gas into the integrated oil tank, thereby forcing the oil and gas pressure at the upper part of the integrated oil tank to increase, and the oil and gas will be discharged to the cylinder head cover faster through the first oil and gas passage.

[0007] In a preferred embodiment, the ventilation system of the engine also includes a second oil and gas passage, which is connected between the upper part of the crankcase and the cylinder head cover; when the high-pressure combustible mixture and a portion of the burned gas in the combustion chamber of the engine leak into the crankcase through the gap between the piston group and the cylinder, the oil and gas pressure inside the crankcase increases, and the oil and gas will be discharged into the cylinder head cover faster through the second oil and gas passage.

[0008] In a preferred embodiment, the ventilation system of the engine further comprises an oil pan oil storage area, which is located at the bottom of the oil pan and below the oil collecting area of ​​the oil pan.

[0009] In a preferred embodiment, when the oil suction pump sucks the engine oil from the oil pan oil collecting area into the integrated oil tank, part of the engine oil will flow from the oil pan oil collecting area into the oil pan oil storage area, and another part of the engine oil will flow from the oil pan oil collecting area into the oil pan oil storage area.

[0010] In a preferred embodiment, the ventilation system of the engine also includes an oil-gas separator arranged in the cylinder head cover. The oil-gas separator adopts a labyrinth oil-gas separation mode. After the oil and gas entering the cylinder head cover pass through the oil-gas separator, the separated engine oil flows back to the oil collection area of ​​the oil pan through the oil return pipe.

[0011] In a preferred embodiment, after the oil and gas entering the cylinder head cover pass through the oil-gas separator, the gas separated under natural ventilation conditions is discharged into the atmosphere through the ventilation pipe, and the gas separated under forced ventilation conditions enters the intake pipe and enters the cylinder together for combustion.

[0012] Compared with the prior art, the ventilation system of the engine of the present invention has the following beneficial effects: the engine body integrated oil tank structure and the setting of parallel dual oil and gas channels allow oil and gas to flow away from multiple channels, the ventilation efficiency is higher, and it can adapt to the ventilation needs of highly integrated engines and new engines, and can also be used in traditional V-type engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the principle of a ventilation system of an engine according to an embodiment of the prior art;

[0014] Figure 2 is a schematic diagram of a ventilation system of an engine according to an embodiment of the present invention;

[0015] Figure 3 Schematic diagram of the structure of a ventilation system of an engine according to an embodiment of the present invention.

[0016] Description of main reference numerals:

[0017] 1-cylinder head cover, 2-second oil and gas passage, 3-first oil and gas passage, 4-integrated oil tank, 5-crankcase, 6-oil pan oil collecting area, 7-oil pan oil storage area. DETAILED DESCRIPTION

[0018] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0019] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0020] like Figures 2 to 3 As shown, Figure 2 is a schematic diagram of a ventilation system of an engine according to an embodiment of the present invention; Figure 3 1 is a schematic diagram of the structure of a ventilation system of an engine according to an embodiment of the present invention. According to a preferred embodiment of the present invention, a ventilation system of an engine has components such as an oil-gas separator, an oil return pipe, a ventilation pipe, and an oil suction pump, and the ventilation system also includes a crankcase 5, an oil pan oil collecting area 6, an oil pan oil storage area 7, an integrated oil tank 4, a cylinder head cover 1, a first oil-gas channel 3, and a second oil-gas channel 2.

[0021] See also Figure 3 In some embodiments, the oil pan oil storage area 7 is located at the bottom of the oil pan and below the oil pan oil collecting area 6. The oil pan oil collecting area 6 is located at the lower part of the crankcase 5. The integrated oil tank 4 is located on both sides of the upper part of the crankcase 5. The cylinder head cover 1 is arranged on the cylinder head. The first oil and gas passage 3 is connected between the cylinder head cover 1 and the top of the integrated oil tank 4. The second oil and gas passage 2 is connected between the upper part of the crankcase 5 and the cylinder head cover 1.

[0022] In some embodiments, when the oil suction pump sucks the engine oil from the oil pan collecting area 6 into the integrated oil tank 4, a portion of the oil and gas will also be sucked into the integrated oil tank 4, thereby forcing the oil and gas pressure at the top of the integrated oil tank 4 to increase, and the oil and gas will be discharged into the cylinder head cover 1 through the first oil and gas passage 3 faster.

[0023] In some embodiments, when the high-pressure combustible mixture and a portion of the burned gas in the combustion chamber of the engine leak into the crankcase 5 through the gap between the piston group and the cylinder, the oil and gas pressure inside the crankcase 5 increases, and the oil and gas will be discharged into the cylinder head cover 1 faster through the second oil and gas passage 2.

[0024] In some embodiments, during the process of the oil suction pump sucking the engine oil from the oil pan oil collecting area 6 into the integrated oil tank 4, a portion of the engine oil will flow from the oil pan oil collecting area 6 into the oil pan oil storage area 7, and another portion of the engine oil will flow from the oil pan oil collecting area 6 into the oil pan oil storage area 7.

[0025] In some embodiments, the oil-gas separator adopts a labyrinth oil-gas separation mode, and the oil and gas after passing through the labyrinth can further enter a cyclone or related oil-gas separation system, and the separated engine oil flows back to the oil pan oil collection area 6 through the oil return pipe.

[0026] In some embodiments, after the oil and gas entering the cylinder head cover 1 pass through the oil-gas separator, the gas separated under natural ventilation conditions is discharged into the atmosphere through the ventilation pipe, and the gas separated under forced ventilation conditions enters the intake pipe and enters the cylinder together for combustion.

[0027] In summary, the ventilation system of the engine of the present invention has the following advantages: the integrated oil tank structure of the engine body and the setting of the parallel dual oil and gas channels allow the oil and gas to flow away from multiple channels, the ventilation efficiency is higher, and it can adapt to the ventilation needs of highly integrated engines and new engines, and can also be used in traditional V-type engines.

[0028] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A ventilation system for an engine, characterized in that: The ventilation system comprises: Crankcase; An oil suction pump, which is arranged in the oil pan of the engine and is used to suck the engine oil from the oil pan; The oil pan collection area, which is located in the lower portion of the crankcase; An integrated oil tank is located on both sides of the upper portion of the crankcase; a cylinder head cover disposed on the cylinder head; and a first oil and gas passage communicating between the cylinder head cover and the top of the integrated oil tank; When the oil suction pump sucks the engine oil from the oil collecting area of ​​the oil pan into the integrated oil tank, a portion of the oil gas is sucked into the integrated oil tank at the same time, thereby forcing the oil gas pressure at the upper part of the integrated oil tank to increase, and the oil gas is discharged into the cylinder head cover through the first oil gas passage at a faster speed; The ventilation system also includes: a second oil-gas passage connected between the upper portion of the crankcase and the cylinder head cover; when a portion of the high-pressure combustible mixture and the burned gas in the combustion chamber of the engine leaks into the crankcase through the gap between the piston group and the cylinder, the oil-gas pressure inside the crankcase increases, and the oil-gas will be discharged into the cylinder head cover faster through the second oil-gas passage; and An oil pan oil storage area, which is located at the bottom of the oil pan and below the oil pan oil collecting area. When the oil suction pump sucks the engine oil from the oil pan oil collecting area to the integrated oil tank, a portion of the engine oil will flow from the oil pan oil collecting area into the oil pan oil storage area, and another portion of the engine oil will flow from the integrated oil tank into the oil pan oil storage area. The first oil and gas channel and the second oil and gas channel constitute a parallel double oil and gas channel.

2. The ventilation system of the engine according to claim 1, characterized in that: It also includes an oil-gas separator, which is arranged in the cylinder head cover. The oil-gas separator adopts a labyrinth oil-gas separation mode. After the oil and gas entering the cylinder head cover pass through the oil-gas separator, the separated engine oil flows back to the oil collection area of ​​the oil pan through the oil return pipe.

3. The ventilation system of the engine according to claim 2, characterized in that: After the oil and gas entering the cylinder head cover passes through the oil and gas separator, the gas separated under natural ventilation conditions is discharged into the atmosphere through the ventilation pipe, and the gas separated under forced ventilation conditions enters the intake pipe and enters the cylinder together for combustion.

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