Engine

Abstract

The invention provides an engine which comprises an engine body, a cylinder head, a cylinder head cover and an oil pan, and the engine body internally comprises a crankshaft chamber, a first air channel and a first oil return channel, the cylinder cover is arranged at the top of the machine body, and a second air channel communicated with the first air channel and a second oil return channel communicated with the first oil return channel are arranged in the cylinder cover; the cylinder head cover is arranged at the top of the cylinder head, a third gas channel communicated with the second gas channel, an oil-gas separation chamber communicated with the third gas channel and a rocker arm mounting chamber communicated with the second oil return channel are arranged in the cylinder head cover, and the oil-gas separation chamber and the rocker arm mounting chamber are independent of each other and are not communicated with each other; the oil sump is arranged at the bottom of the engine body; an oil storage cavity of the oil sump is communicated with the crankshaft chamber; when the air pressure in the crankshaft chamber is increased, an oil-gas mixture sequentially passes through the first gas channel, the second gas channel and the third gas channel, then flows into the oil-gas separation chamber and is separated and discharged; and engine oil in the rocker arm mounting chamber flows into the oil storage cavity of the oil pan through the second oil return channel and the first oil return channel in sequence. And meanwhile, the ventilation channel of the crankshaft chamber is lengthened and is not mixed with oil and gas in the rocker arm mounting chamber, so that the oil content in gas is reduced, and the separation pressure of the oil-gas separation chamber is reduced.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an engine with a crankcase ventilation system. Background Technology

[0002] During engine operation, due to the gap between the piston rings and cylinder walls, some gas inevitably leaks from the combustion chamber into the crankcase. If this gas is not properly vented, the engine pressure will gradually increase, leading to oil seal damage and ultimately crankcase gas leakage, polluting the environment. Therefore, all engines must be equipped with a crankcase ventilation system to remove this gas from the crankcase, ensuring that the crankcase pressure remains within the normal range and thus extending the lifespan of engine components such as oil seals.

[0003] In existing technologies, engine crankcase ventilation typically involves ventilation through pushrod holes on one side of the cylinder block. This results in a limited ventilation circuit, and the presence of engine oil flowing from the pushrod holes through the cylinder head cover to the oil pan further obstructs the exhaust of gases from the crankcase, leading to high resistance and poor ventilation. Furthermore, existing crankcase ventilation systems often employ a separate external oil-gas separator at the top of the ventilation path, connected to the oil pan via external piping for oil return. This single-sided ventilation circuit combined with a separate oil-gas separator results in low ventilation efficiency and incomplete oil-gas separation.

[0004] Therefore, it is necessary to provide an engine that overcomes the defects mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide an engine.

[0006] According to one aspect of the present invention, an engine is provided, comprising:

[0007] The engine body includes a crankshaft chamber for housing the crankshaft, and a first air passage and a first oil return passage communicating with the crankshaft chamber;

[0008] The cylinder head is located on the top of the engine body. The cylinder head has a second air passage communicating with the first air passage and a second oil return passage communicating with the first oil return passage.

[0009] The cylinder head cover is located on the top of the cylinder head. Inside the cylinder head cover, there is a third air passage communicating with the second air passage, an oil-gas separation chamber communicating with the third air passage, and a rocker arm mounting chamber communicating with the second oil return passage. The oil-gas separation chamber and the rocker arm mounting chamber are independent of each other and are not connected to each other.

[0010] An oil pan is located at the bottom of the engine block, and the oil storage chamber of the oil pan is connected to the crankshaft chamber.

[0011] When the air pressure in the crankshaft chamber increases, the oil-air mixture flows into the oil-air separation chamber after passing through the first air passage, the second air passage, and the third air passage in sequence, and is then separated and discharged; the engine oil in the rocker arm mounting chamber flows into the oil storage chamber of the oil pan in sequence through the second oil return passage and the first oil return passage.

[0012] Preferably, the first air passage and the first oil return passage are respectively located on opposite sides of the engine block, and the second air passage and the second oil return passage are respectively located on opposite sides of the cylinder head.

[0013] Preferably, the first return oil passage and the second return oil passage form a push rod channel for setting the push rod.

[0014] Preferably, the third air passage is located on one side of the cylinder head cover and is arranged vertically corresponding to the second air passage, and the oil-gas separation chamber is located above the rocker arm mounting chamber and protrudes from the rocker arm mounting chamber.

[0015] Preferably, the bottom of the oil-gas separation chamber is provided with a partition plate, which is used to separate the oil-gas separation chamber from the rocker arm mounting chamber, and the partition plate is provided with an oil return hole.

[0016] Preferably, the baffle plate around the oil return hole is arranged in a funnel shape, the oil return hole is connected to an oil return pipe, and the oil return pipe is arranged in a hook shape below the oil return hole and located in the rocker arm mounting chamber.

[0017] Preferably, the oil-gas separation chamber is arranged in a labyrinthine manner, including multiple staggered baffles, which are arranged along the length of the oil-gas separation chamber and intersecting along the width of the oil-gas separation chamber.

[0018] Preferably, a gasket is provided between the cylinder head and the engine block. The gasket includes a vent hole located between the first air passage and the second air passage. The projection of the vent hole on the upper surface of the engine block is located within the projection of the outlet of the first air passage on the upper surface of the engine block. The projection of the vent hole on the upper surface of the engine block is located within the projection of the inlet of the second air passage on the upper surface of the engine block.

[0019] Preferably, the gasket is arranged in multiple layers at intervals at the vent.

[0020] Compared with the prior art, the engine provided by the present invention has the following beneficial effects:

[0021] Due to the adoption of the above technical solution, this invention has the advantages of simple structure and low cost. The crankshaft chamber, through the first and second air passages, forms a ventilation channel that is relatively independent from the pushrod channel for the return of lubricating oil from the top surface of the cylinder head to the oil pan. This prevents the lubricating oil flowing back from the top surface of the cylinder head from obstructing the ventilation of the crankshaft chamber. At the same time, the ventilation channel of the crankshaft chamber is lengthened and does not mix with the oil and gas inside the rocker arm mounting chamber, reducing the oil content in the gas, decreasing the separation pressure in the oil-gas separation chamber, and improving the oil-gas separation efficiency. The independent setting of the ventilation channel and the pushrod channel results in high ventilation efficiency and low resistance in the crankshaft chamber. While the ventilation is smoother, the lubricating oil can quickly flow back from the top of the diesel engine cylinder head to the oil pan, avoiding mutual interference and reducing the degree of oil-gas mixing. Attached Figure Description

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 This is a perspective view of the engine of the present invention;

[0024] Figure 2 This is a top view of the engine of the present invention;

[0025] Figure 3 for Figure 2 A cross-sectional view of surface AA;

[0026] Figure 4 for Figure 2 A cross-sectional view of the BB side;

[0027] Figure 5 This is a perspective view of the cylinder head cover of the present invention;

[0028] Figure 6 This is a perspective view of the cylinder head cover with the partition removed according to the present invention.

[0029] The components are as follows: 1. Engine body; 11. Cylinder; 12. Crankshaft chamber; 13. First intake port; 14. First oil return port; 2. Cylinder head; 21. Second intake port; 22. Second oil return port; 3. Cylinder head cover; 31. Third intake port; 32. Oil-gas separation chamber; 321. Exhaust port; 322. Baffle; 323. Baffle; 324. Oil return pipe; 33. Rocker arm mounting chamber; 4. Oil pan; 41. Oil reservoir; 5. Gasket; 51. Vent; 6. Rocker arm assembly. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0032] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0036] See Figure 1 This embodiment discloses an engine, including a cylinder head cover 3, a cylinder head 2, an engine block 1, and an oil pan 4 arranged sequentially from top to bottom. The engine block 1 includes a cylinder 11 for piston movement, a crankshaft chamber 12 for mounting the crankshaft, and a first intake passage 13 and a first oil return passage 14 located on both sides of the cylinder 11, i.e., the first intake passage 13 and the first oil return passage 14 are respectively located on opposite sides of the engine block 1. The inlet of the first intake passage 13 communicates with the crankshaft chamber 12, and the outlet of the first oil return passage 14 communicates with the crankshaft chamber 12. The oil pan 4 is located at the bottom of the engine block 1, and the oil reservoir 41 of the oil pan 4 communicates with the crankshaft chamber 12.

[0037] The cylinder head 2 is located on top of the engine block 1. Inside the cylinder head 2 are a second air passage 21 communicating with the first air passage 13 and a second oil return passage 22 communicating with the first oil return passage 14. The second air passage 21 and the second oil return passage 22 are respectively located on opposite sides of the cylinder head 2. The second air passage 21 is vertically aligned with the first air passage 13, and the second oil return passage 22 is vertically aligned with the first oil return passage 14. The inlet of the second air passage 21 is connected to the outlet of the first air passage 13, and the outlet of the second oil return passage 22 is connected to the inlet of the first oil return passage 14. The first oil return passage 14 and the second oil return passage 22 form a push rod channel for setting the push rod, which can move axially within the push rod channel.

[0038] The cylinder head cover 3 is located on top of the cylinder head 2. Inside the cylinder head cover 3 are a third air passage 31 communicating with the second air passage 21, an oil-gas separation chamber 32 communicating with the third air passage 31, and a rocker arm mounting chamber 33 communicating with the second oil return passage 22. The oil-gas separation chamber 32 and the rocker arm mounting chamber 33 are independent of each other and do not communicate with each other. A rocker arm assembly 6 is installed inside the rocker arm mounting chamber 33.

[0039] The third air passage 31 is located on one side of the cylinder head cover 3 and is vertically aligned with the second air passage 21. The inlet of the third air passage 31 is connected to the outlet of the second air passage 21, and the outlet of the third air passage 31 is connected to the oil-gas separation chamber 32. The oil-gas separation chamber 32 is located above the rocker arm mounting chamber 33 and protrudes from the rocker arm mounting chamber 33. A partition 322 is provided at the bottom of the oil-gas separation chamber 32, which separates the oil-gas separation chamber 32 from the rocker arm mounting chamber 33. The partition 322 has an oil return hole. The partition 322 around the oil return hole is funnel-shaped, and the oil return hole is connected to an oil return pipe 324. The oil return pipe 324 is hook-shaped and located below the oil return hole and inside the rocker arm mounting chamber 33. An exhaust port 321 for discharging gas is provided at the end of the oil-gas separation chamber 32.

[0040] The oil-gas separation chamber 32 is arranged in a maze-like manner, including multiple staggered baffles 323. The baffles 323 are arranged along the length of the oil-gas separation chamber 32 and are crisscrossed along the width of the oil-gas separation chamber 32.

[0041] A gasket 5 is provided between the cylinder head 2 and the engine block 1. The gasket 5 includes a vent hole located between the first air passage 13 and the second air passage 21. The area of ​​the vent hole is smaller than the radial cross-sectional area of ​​the first air passage 13, and the area of ​​the vent hole is smaller than the radial cross-sectional area of ​​the second air passage 21. The projection of the vent 51 onto the upper surface of the engine block 1 is located within the projection of the outlet of the first air passage 13 onto the upper surface of the engine block 1, and the projection of the vent 51 onto the upper surface of the engine block 1 is located within the projection of the inlet of the second air passage 21 onto the upper surface of the engine block 1. The gasket 5 is arranged in multiple layers at the vent 51. Thus, the gasket 5 forms a sharp oil scraping blade. When the oil and gas in the crankshaft chamber 12 enter the first air passage 13 and flow to the second air passage 21, the gasket 5 can effectively block the liquid lubricating oil that is affected by the upward airflow along the inner wall of the first air passage 13. At the same time, when the gaseous lubricating oil passes through the vent hole, it will be blocked by the relatively sharp gasket 5 on the periphery of the vent hole, and will also form droplets that are blocked to a certain extent.

[0042] When the air pressure inside the crankshaft chamber 12 increases, the oil-air mixture flows sequentially through the first air passage 13, the second air passage 21, and the third air passage 31 into the oil-air separation chamber 32, where it is separated into liquid lubricating oil and the mixture. The lubricating oil flows through the return oil pipe 324 into the rocker arm mounting chamber 33, and then flows back to the oil pan 4 through the push rod channel. The mixture is discharged through the exhaust port 321. The engine oil in the rocker arm mounting chamber 33 flows into the oil storage chamber 41 of the oil pan 4 through the push rod channel. Oil and air are discharged and returned through two separate channels, avoiding mutual interference and reducing the degree of oil-air mixing. The upward ventilation channel of the crankshaft chamber 12 and the downward lubricating oil return channel from the top of the cylinder head 2 to the oil pan 4 are relatively independent, preventing the lubricating oil returning from the top of the cylinder head 2 from obstructing the ventilation of the crankshaft chamber 12, thus avoiding the problem of excessively high pressure in the crankshaft chamber 12 and low oil-air separation efficiency.

[0043] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. An engine, characterized in that, include: The engine body includes a crankshaft chamber for housing the crankshaft, and a first air passage and a first oil return passage communicating with the crankshaft chamber; The cylinder head is located on the top of the engine body. The cylinder head has a second air passage communicating with the first air passage and a second oil return passage communicating with the first oil return passage. The cylinder head cover is located on the top of the cylinder head. Inside the cylinder head cover, there is a third air passage communicating with the second air passage, an oil-gas separation chamber communicating with the third air passage, and a rocker arm mounting chamber communicating with the second oil return passage. The oil-gas separation chamber and the rocker arm mounting chamber are independent of each other and are not connected to each other. An oil pan is located at the bottom of the engine block, and the oil storage chamber of the oil pan is connected to the crankshaft chamber. When the air pressure in the crankshaft chamber increases, the oil-air mixture flows into the oil-air separation chamber after passing through the first air passage, the second air passage, and the third air passage in sequence, and is then separated and discharged; the engine oil in the rocker arm mounting chamber flows into the oil storage chamber of the oil pan in sequence through the second oil return passage and the first oil return passage.

2. The engine as claimed in claim 1, characterized in that, The first air passage and the first oil return passage are respectively located on opposite sides of the engine block, and the second air passage and the second oil return passage are respectively located on opposite sides of the cylinder head.

3. The engine as described in claim 2, characterized in that, The first and second oil return channels form a push rod channel for setting the push rod.

4. The engine as described in claim 3, characterized in that, The third air passage is located on one side of the cylinder head cover and is arranged vertically and vertically corresponding to the second air passage. The oil-gas separation chamber is located above the rocker arm mounting chamber and protrudes from the rocker arm mounting chamber.

5. The engine as described in claim 4, characterized in that, The bottom of the oil-gas separation chamber is provided with a partition plate, which is used to separate the oil-gas separation chamber from the rocker arm mounting chamber. The partition plate is provided with an oil return hole.

6. The engine as described in claim 5, characterized in that, The baffle plate around the oil return hole is funnel-shaped, and the oil return hole is connected to an oil return pipe. The oil return pipe is hook-shaped and located below the oil return hole and in the rocker arm mounting chamber.

7. The engine as claimed in claim 6, characterized in that, The oil-gas separation chamber is arranged in a labyrinthine manner, including multiple staggered baffles. The baffles are arranged along the length of the oil-gas separation chamber and intersect along the width of the oil-gas separation chamber.

8. The engine as claimed in claim 2, characterized in that, A gasket is provided between the cylinder head and the engine block. The gasket includes a vent hole located between the first air passage and the second air passage. The projection of the vent hole on the upper surface of the engine block is located within the projection of the outlet of the first air passage on the upper surface of the engine block. The projection of the vent hole on the upper surface of the engine block is located within the projection of the inlet of the second air passage on the upper surface of the engine block.

9. The engine as claimed in claim 8, characterized in that, The gasket is arranged in multiple layers at intervals at the vent.

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