An engine crankcase oil-gas separation structure and an engine

Abstract

The present application relates to a kind of engine crankcase oil-gas separation structure and engine, and the engine crankcase oil-gas separation structure includes oil-gas separation cavity, oil-gas inflow passage, backflow passage, exhaust passage and air baffle protruding portion, oil-gas separation cavity is extended from the front end to the rear end of engine body at the side of engine body, and located above the crankcase chamber of engine body, oil-gas inflow passage is communicated with the crankcase chamber with one end of oil-gas separation cavity, multiple backflow passages are spaced apart along the extension direction of oil-gas separation cavity, and are communicated with the crankcase chamber of oil-gas separation cavity, exhaust passage is arranged on the top of oil-gas separation cavity with backflow passage staggered, and air baffle protruding portion is arranged on at least one side cavity wall of oil-gas separation cavity.The above-mentioned engine crankcase oil-gas separation structure can realize the effective organization transmission of oil-gas in engine body, and realizes oil-gas pre-separation in transmission path, guarantees the effective reduction of oil content in exhaust gas.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an engine crankcase oil-gas separation structure and an engine. Background Technology

[0002] For conventional engines, proper guidance and separation of oil and gas within the crankshaft cavity are necessary to achieve effective oil-gas organization and transmission. Different engine layouts require different structural designs to meet this requirement. For side-mounted camshaft engines, oil-gas transmission can be achieved through the tappet cavity. However, for overhead camshaft engines, which lack tappet cavities, oil-gas transmission is achieved through a truss structure on the engine block. However, the addition of the truss structure occupies the vertical space running along the left and right sides of the engine, increasing the difficulty of manufacturing and casting. Alternatively, air intakes can be directly installed on the engine block skirt to achieve oil-gas transmission, but this method results in a short transmission path, leading to poor pre-separation of oil and gas. This poor pre-separation effect results in excessively high oil content in the exhaust gas, increasing the separation load on the oil-gas separator and reducing its separation efficiency. Summary of the Invention

[0003] The first objective of this invention is to provide an engine crankcase oil-gas separation structure that enables the diversion and transmission of oil and gas as well as the pre-separation of oil and gas.

[0004] The second objective of this invention is to provide an engine employing the aforementioned engine crankcase oil-gas separation structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect of this application, an engine crankcase oil-gas separation structure is provided for installation in the engine block, the engine crankcase oil-gas separation structure comprising:

[0007] An oil-gas separation chamber is disposed on one side of the machine body, extending from the front end of the machine body to the rear end of the machine body, and located above the crankshaft cavity of the machine body;

[0008] An oil-gas inflow channel connects one end of the oil-gas separation chamber to the crankshaft cavity;

[0009] A reflux channel, wherein multiple reflux channels are spaced apart along the extension direction of the oil-gas separation chamber, and the reflux channels connect the oil-gas separation chamber to the crankshaft chamber at the bottom of the oil-gas separation chamber;

[0010] An exhaust channel is provided at the top of the oil-gas separation chamber to connect the oil-gas separation chamber with the outside. The exhaust channel is staggered from the return channel in the extending direction of the oil-gas separation chamber.

[0011] A baffle protrusion is provided on at least one side wall of the oil-gas separation chamber. The baffle protrusion is located between the exhaust channel and the return channel. The projection of the baffle protrusion on the projection plane covers the projection of the end of the return channel that communicates with the oil-gas separation chamber on the projection plane. The projection plane is parallel to the crankshaft axis of the engine body and perpendicular to the cylinder axis of the engine body.

[0012] In one possible implementation, an expansion buffer chamber is provided at one end of the oil-gas separation chamber near the rear end of the machine body, and the oil-gas inflow channel connects the expansion buffer chamber to the crankshaft cavity of the machine body at the bottom of the expansion buffer chamber.

[0013] In one possible implementation, the reflux channel includes a first reflux channel and a second reflux channel, wherein the flow cross-sectional area of ​​the second reflux channel is larger than that of the first reflux channel, and the second reflux channel is located at one end of the oil-gas separation chamber near the front end of the machine body.

[0014] In one possible implementation, the cross-sectional area of ​​the second return channel is greater than or equal to n times the cross-sectional area of ​​the first return channel, where n is a positive number greater than 1.

[0015] In one possible implementation, the cross-sectional area of ​​the oil and gas inflow channel is greater than or equal to m times the sum of the cross-sectional areas of the first return channel and the second return channel, where m is a positive number greater than 1.

[0016] In one possible implementation, the cross-sectional area of ​​the second reflux channel is greater than twice the cross-sectional area of ​​the first reflux channel, and the cross-sectional area of ​​the oil and gas inflow channel is greater than ten times the sum of the cross-sectional areas of the first reflux channel and the second reflux channel.

[0017] In one possible implementation, except for the cylinder of the engine body corresponding to the exhaust passage, the oil-gas separation chamber is connected to at least one of the return passages at the positions of the other cylinders of the engine body.

[0018] In one possible implementation, the oil-gas separation chamber has a meandering structure in the extending direction, consisting of multiple curved sections smoothly connected together.

[0019] In one possible implementation, the air-blocking protrusion extends from one end of the oil-gas separation chamber near the front end of the machine body to one end of the oil-gas separation chamber near the rear end of the machine body, and forms a meandering shape following the curvature of the oil-gas separation chamber.

[0020] As can be seen from the above technical solution, this invention discloses an engine crankcase oil-gas separation structure, which includes an oil-gas separation chamber, an oil-gas inflow channel, a return channel, an exhaust channel, and a baffle protrusion. The oil-gas separation chamber is located on one side of the engine block, extending from the front end to the rear end of the engine block and positioned above the crankshaft cavity. The oil-gas inflow channel connects one end of the oil-gas separation chamber to the crankshaft cavity. Multiple return channels are spaced apart along the extension direction of the oil-gas separation chamber. The bottom of the separation chamber connects the oil-gas separation chamber to the crankshaft chamber. The exhaust passage is located at the top of the oil-gas separation chamber to connect the oil-gas separation chamber to the outside. The exhaust passage is staggered from the return passage in the extension direction of the oil-gas separation chamber. At least one side wall of the oil-gas separation chamber is provided with a baffle protrusion. The baffle protrusion is located between the exhaust passage and the return passage. The projection of the baffle protrusion on the projection surface covers the projection of the end of the return passage that connects to the oil-gas separation chamber on the projection surface. The projection surface is parallel to the crankshaft axis of the engine body and perpendicular to the cylinder axis of the engine body.

[0021] In application, the aforementioned oil-gas separation chamber extends from the front end to the rear end of the engine body, providing sufficient transmission path length for the oil and gas entering the chamber. The oil and gas in the crankshaft cavity enter the oil-gas separation chamber through the oil-gas inflow channel and flow from one end to the other along the chamber. During this process, the baffle protrusion collides with the oil and gas, accelerating the settling of the oil in the oil and gas under its own gravity, thus achieving the effect of oil-gas separation. The separated oil flows back to the crankshaft cavity through the return channel, and the separated gas is discharged from the exhaust channel. Since the exhaust channel is staggered with the return channel in the extension direction of the oil-gas separation chamber, the exhaust channel and the return channel are far apart, avoiding oil return while bypassing the gas path.

[0022] It is evident that the engine crankcase oil-gas separation structure provided in this application can effectively organize and transmit oil and gas within the engine body, and achieve pre-separation of oil and gas in the transmission path, ensuring an effective reduction in the oil content of the exhaust gas.

[0023] In a second aspect of this application, an engine is provided, wherein the engine body is provided with an engine crankcase oil-gas separation structure as described in the first aspect and its possible implementations.

[0024] The engine provided in this application adopts the aforementioned engine crankcase oil-gas separation structure, and therefore should have the same beneficial effects as the engine crankcase oil-gas separation structure, which will not be elaborated here. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the engine crankcase oil-gas separation structure provided in the embodiments of this application;

[0027] Figure 2 A cross-sectional view of the engine crankcase oil-gas separation structure provided in the embodiments of this application. Figure 1 ;

[0028] Figure 3 A cross-sectional view of the engine crankcase oil-gas separation structure provided in the embodiments of this application. Figure 2 ;

[0029] Figure 4 A cross-sectional view of the engine crankcase oil-gas separation structure provided in the embodiments of this application. Figure 3 ;

[0030] Figure 5 A cross-sectional view of the engine crankcase oil-gas separation structure provided in the embodiments of this application. Figure 4 .

[0031] In the picture:

[0032] 1 is the oil-gas separation chamber; 2 is the expansion buffer chamber; 3 is the return channel; 301 is the first return channel; 302 is the second return channel; 4 is the exhaust channel; 5 is the engine block; 501 is the cylinder; 6 is the air baffle protrusion; 7 is the crankshaft chamber; 8 is the oil-gas inflow channel. Detailed Implementation

[0033] One of the core aspects of this invention is to provide an engine crankcase oil-gas separation structure, the structural design of which enables the separation and transmission of oil and gas as well as the pre-separation of oil and gas.

[0034] Another core aspect of this invention is to provide an engine employing the aforementioned engine crankcase oil-gas separation structure.

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This application provides an engine crankcase oil-gas separation structure. Please refer to [link / reference]. Figures 1 to 5 The engine crankcase oil-gas separation structure is located inside the engine block 5 and includes an oil-gas separation chamber 1, an oil-gas inflow channel 8, a return channel 3, an exhaust channel 4, and a baffle protrusion 6.

[0037] The oil-gas separation chamber 1 is located on one side of the engine block 5, extending from the front end to the rear end of the engine block 5. This extension does not mean that both ends of the oil-gas separation chamber 1 must be flush with the front and rear ends of the engine block 5. Rather, it is designed according to the layout of the engine block 5, so that the two ends of the oil-gas separation chamber 1 are as close as possible to the front and rear ends of the engine block 5. This ensures that the length of the oil-gas separation chamber 1 is as similar as possible to the length of the crankshaft cavity 7 of the engine block 5. This also increases the oil-gas separation path, resulting in better oil-gas separation. The front end of the engine block 5 refers to the end where the crankshaft pulley is mounted, typically connecting to accessories such as the generator, water pump, and air conditioning compressor. The rear end of the engine block 5 is the end where the flywheel is mounted on the crankshaft, which is the engine's power output end, connecting to components such as the gearbox.

[0038] The oil-gas separation chamber 1 is located above the crankshaft cavity 7 of the engine block 5. The oil-gas inflow channel 8 connects one end of the oil-gas separation chamber 1 to the crankshaft cavity 7. Multiple return channels 3 are spaced apart along the extension direction of the oil-gas separation chamber 1. The return channels 3 connect the oil-gas separation chamber 1 to the crankshaft cavity 7 at the bottom of the oil-gas separation chamber 1.

[0039] The exhaust channel 4 is located at the top of the oil-gas separation chamber 1 and is used to connect the oil-gas separation chamber 1 with the outside. The exhaust channel 4 is staggered from the return channel 3 in the extending direction of the oil-gas separation chamber 1.

[0040] At least one side wall of the oil-gas separation chamber 1 is provided with a baffle protrusion 6. One or more baffle protrusions 6 may be provided. The baffle protrusion 6 is located between the exhaust channel 4 and the return channel 3. The projection of the baffle protrusion 6 on the projection surface covers the projection of the end of the return channel 3 that connects to the oil-gas separation chamber 1 on the projection surface. The projection surface is parallel to the crankshaft axis of the engine body 5 and perpendicular to the axis of the cylinder 501 of the engine body 5.

[0041] In application, the oil-gas separation chamber 1 extends from the front end of the engine body 5 to the rear end of the engine body 5, so that the oil and gas entering the oil-gas separation chamber 1 have a sufficient transmission path length. The oil and gas in the crankshaft cavity 7 enter the oil-gas separation chamber 1 through the oil-gas inflow channel 8 and flow from one end of the oil-gas separation chamber 1 to the other end. During this process, the air baffle protrusion 6 collides with the oil and gas, accelerating the settling of the oil in the oil and gas under its own gravity, thus achieving the effect of oil-gas separation. The separated oil flows back to the crankshaft cavity 7 through the return channel 3, and the separated gas is discharged from the exhaust channel 4. Since the exhaust channel 4 is staggered with the return channel 3 in the extension direction of the oil-gas separation chamber 1, the exhaust channel 4 and the return channel 3 are far apart from each other, avoiding oil return and bypassing the gas path.

[0042] Compared with the prior art, the engine crankcase oil-gas separation structure provided in this application embodiment can effectively organize and transfer oil and gas within the engine block 5, and achieve pre-separation of oil and gas in the transfer path to ensure effective reduction of oil content in the exhaust gas.

[0043] It is foreseeable that, for an engine, the crankshaft cavity 7, located near the rear end of the engine block 5, is where oil and gas most easily accumulate. Therefore, in one embodiment of this application, as... Figure 1 , Figure 2 and Figure 4 As shown, an expansion buffer chamber 2 is provided at one end of the oil-gas separation chamber 1 near the rear end of the engine block 5. The oil-gas inflow channel 8 connects the expansion buffer chamber 2 to the crankshaft cavity 7 of the engine block 5 at the bottom of the expansion buffer chamber 2. The oil and gas in the crankshaft cavity 7 first enter the expansion buffer chamber 2 for buffering, preventing a large amount of oil and gas in the crankshaft cavity 7 from flowing directly out of the exhaust channel 4 after entering the oil-gas separation chamber 1. After being buffered and redirected by the expansion buffer chamber 2, the oil and gas then enter the main cavity of the oil-gas separation chamber 1 for oil-gas separation.

[0044] As described above, multiple return channels 3 are provided. Each return channel 3 can have the same flow cross-sectional area, or the flow cross-sectional area of ​​at least one return channel 3 can be different from the flow cross-sectional areas of the other return channels 3, such as... Figure 1 and Figure 3 As shown, in one embodiment of this application, the reflux channel 3 adopts two different flow cross-sectional areas, namely, the reflux channel 3 includes a first reflux channel 301 and a second reflux channel 302. The flow cross-sectional area of ​​the second reflux channel 302 is larger than that of the first reflux channel 301. The second reflux channel 302 is located at the end of the oil-gas separation chamber 1 near the front end of the machine body 5. Because the second reflux channel 302 has a larger flow cross-sectional area, it can realize the function of transferring a small amount of oil and gas from the crankshaft cavity 7 to the oil-gas separation chamber 1.

[0045] Based on this, the exhaust passage 4 is located near the middle of the oil-gas separation chamber 1, and relative to the rear end of the engine block 5, the exhaust passage 4 is closer to the front end of the engine block 5. This allows the exhaust passage 4 to be far away from the oil-gas inflow passage 8 and the second return passage 302, so that the oil and gas flowing into both ends of the oil-gas separation chamber 1 have a longer flow path.

[0046] To further optimize the above technical solution, in one embodiment of this application, the flow cross-sectional area of ​​the second return channel 302 is greater than or equal to n times the flow cross-sectional area of ​​the first return channel 301, where n is a positive number greater than 1, i.e., n can be 1.1, 1.2, 1.3...2, 2.1, 2.2... etc.

[0047] To ensure that most of the oil and gas can enter the oil-gas separation chamber 1 from the oil-gas inflow channel 8, in one embodiment of this application, the flow cross-sectional area of ​​the oil-gas inflow channel 8 is greater than or equal to m times the sum of the flow cross-sectional areas of the first return channel 301 and the second return channel 302, where m is a positive number greater than 1, i.e., m can be 1.1, 1.2, 1.3...2, 2.1, 2.2... etc.

[0048] Specifically, the cross-sectional area of ​​the second reflux channel 302 is more than twice the cross-sectional area of ​​the first reflux channel 301, so that the second reflux channel 302 can both allow the separated oil to flow back to the crankshaft cavity 7 and allow some of the oil and gas in the crankshaft cavity 7 to smoothly enter the oil-gas separation chamber 1 through the second reflux channel 302. The cross-sectional area of ​​the oil-gas inflow channel 8 is more than 10 times the sum of the cross-sectional areas of the first reflux channel 301 and the second reflux channel 302, so that most of the oil and gas in the crankshaft cavity 7 enters the oil-gas separation chamber 1 through the oil-gas inflow channel 8.

[0049] In one embodiment of this application, the exhaust passage 4 and the return passage 3 are provided corresponding to the cylinder 501 of the engine block 5. In addition to the cylinder 501 of the engine block 5 corresponding to the exhaust passage 4, the oil-gas separation chamber 1 is connected to at least one return passage 3 at the position corresponding to the other cylinder 501 of the engine block 5. That is, the position corresponding to the other cylinder 501 of the engine block 5 of the oil-gas separation chamber 1 can be connected to one or more return passages 3.

[0050] like Figure 1As shown, two second return channels 302 are provided at the cylinder 501 near the front end of the engine block 5. This allows the oil and gas in the crankshaft cavity 7 at the front end of the engine block 5 to enter the oil-gas separation chamber 1 through these two second return channels 302. Except for the cylinder 501 near the front end of the engine block 5 and the cylinder 501 with the exhaust channel 4, the oil-gas separation chamber 1 is connected to a first return channel 301 at the bottom of the corresponding other cylinder 501.

[0051] Preferably, in order to enhance the oil-gas separation effect, in one embodiment of this application, such as Figure 1 As shown, the oil-gas separation chamber 1 has a meandering structure in the extending direction, which is composed of multiple curved sections that are smoothly connected. This can further increase the flow path of oil and gas in the oil-gas separation chamber 1 and achieve a better oil-gas separation effect.

[0052] Furthermore, in one embodiment of this application, such as Figure 1 As shown, each curved section corresponds to a cylinder 501 of the engine block 5, so that the oil-gas separation chamber 1 can fit more closely with the shape of the engine block 5, thereby increasing the length of the oil-gas separation chamber 1 while reducing the impact on the shape of the engine block 5.

[0053] Correspondingly, the air baffle protrusion 6 extends from the front end of the oil-gas separation chamber 1 near the front end of the engine body 5 to the rear end of the oil-gas separation chamber 1 near the rear end of the engine body 5, and forms a meandering shape following the curvature of the oil-gas separation chamber 1. It should be noted that the air baffle protrusion 6 is not limited to this shape. Depending on the arrangement of the exhaust channel 4 and the return channel 3, the air baffle protrusion 6 can adopt various shapes, which are not limited here.

[0054] This application also provides an engine that includes the engine crankcase oil-gas separation structure as described in the above embodiments. Since the engine adopts the engine crankcase oil-gas separation structure in the above embodiments, the technical effect of the engine can be referred to the above embodiments.

[0055] The engine is preferably an overhead camshaft engine. However, it should be noted that it is not limited to overhead camshaft engines. The crankcase oil-gas separation structure provided in this application embodiment can also be used in engines with other layout structures, which is not limited here.

[0056] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0057] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0058] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An engine crankcase oil-gas separation structure, for installation in the engine block (5), characterized in that, The engine crankcase oil-gas separation structure includes: An oil-gas separation chamber (1) is disposed on one side of the machine body (5). The oil-gas separation chamber (1) extends from the front end of the machine body (5) to the rear end of the machine body (5) and is located above the crankshaft cavity (7) of the machine body (5). The oil and gas inflow channel (8) connects one end of the oil and gas separation chamber (1) to the crankshaft chamber (7); The return channels (3) are arranged at intervals along the extension direction of the oil-gas separation chamber (1), and the return channels (3) connect the oil-gas separation chamber (1) and the crankshaft chamber (7) at the bottom of the oil-gas separation chamber (1). An exhaust channel (4) is provided at the top of the oil-gas separation chamber (1) to connect the oil-gas separation chamber (1) with the outside. The exhaust channel (4) is arranged in a staggered manner with the return channel (3) in the extending direction of the oil-gas separation chamber (1). The air baffle protrusion (6) is provided on at least one side of the cavity wall of the oil-gas separation chamber (1). The air baffle protrusion (6) is located between the exhaust channel (4) and the return channel (3). The projection of the air baffle protrusion (6) on the projection plane covers the projection of the end of the return channel (3) that communicates with the oil-gas separation chamber (1) on the projection plane. The projection plane is parallel to the crankshaft axis of the machine body (5) and perpendicular to the axis of the cylinder (501) of the machine body (5).

2. The engine crankcase oil-gas separation structure according to claim 1, characterized in that, An expansion buffer chamber (2) is provided at one end of the oil-gas separation chamber (1) near the rear end of the machine body (5). The oil-gas inflow channel (8) connects the expansion buffer chamber (2) to the crankshaft cavity (7) of the machine body (5) at the bottom of the expansion buffer chamber (2).

3. The engine crankcase oil-gas separation structure according to claim 1 or 2, characterized in that, The reflux channel (3) includes a first reflux channel (301) and a second reflux channel (302). The cross-sectional area of ​​the second reflux channel (302) is larger than that of the first reflux channel (301), and the second reflux channel (302) is located at one end of the oil-gas separation chamber (1) near the front end of the body (5).

4. The engine crankcase oil-gas separation structure according to claim 3, characterized in that, The cross-sectional area of ​​the second return channel (302) is greater than or equal to n times the cross-sectional area of ​​the first return channel (301), where n is a positive number greater than 1.

5. The engine crankcase oil-gas separation structure according to claim 4, characterized in that, The cross-sectional area of ​​the oil and gas inflow channel (8) is greater than or equal to m times the sum of the cross-sectional area of ​​the first return channel (301) and the cross-sectional area of ​​the second return channel (302), where m is a positive number greater than 1.

6. The engine crankcase oil-gas separation structure according to claim 5, characterized in that, The cross-sectional area of ​​the second return channel (302) is more than twice the cross-sectional area of ​​the first return channel (301), and the cross-sectional area of ​​the oil and gas inflow channel (8) is more than 10 times the sum of the cross-sectional areas of the first return channel (301) and the second return channel (302).

7. The engine crankcase oil-gas separation structure according to claim 1, characterized in that, Except for the cylinder (501) of the machine body (5) corresponding to the exhaust channel (4), the oil-gas separation chamber (1) is connected to at least one return channel (3) at the position of the other cylinder (501) of the machine body (5).

8. The engine crankcase oil-gas separation structure according to claim 1, characterized in that, The oil-gas separation chamber (1) has a meandering structure in the extending direction, which is smoothly connected by multiple curved parts.

9. The engine crankcase oil-gas separation structure according to claim 8, characterized in that, The air-blocking protrusion (6) extends from one end of the oil-gas separation chamber (1) near the front end of the body (5) to one end of the oil-gas separation chamber (1) near the rear end of the body (5), and forms a meandering shape as the oil-gas separation chamber (1) bends and undulates.

10. An engine, characterized in that, The engine block (5) is provided with an engine crankcase oil-gas separation structure as described in any one of claims 1-9.

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