Engine and vehicle

Abstract

The application relates to the engine technical field, and provides an engine and a vehicle, which comprise a cylinder body, a bearing cover, a crankshaft and an oil return assembly. At least one cylinder is arranged in the cylinder body, a piston is arranged in the cylinder, the cylinder body has a crankshaft space, the bearing cover is arranged in the cylinder body and connected with the cylinder body, a crankshaft through hole is defined between the bearing cover and the cylinder body, the bearing cover and the cylinder body are in sealing connection, the crankshaft passes through the crankshaft through hole, and the oil return assembly is arranged above an oil return port of the cylinder body. The oil return assembly comprises a one-way valve which is suitable for being opened when the gas pressure in the crankshaft space exceeds a pressure threshold. Thus, on one hand, blow-by gas between the cylinders can be improved, working noise can be improved, NVH performance can be improved, the influence of the blow-by gas on the lubricating oil return can be reduced, on the other hand, the pressure in the crankcase can be avoided from being abnormal, the piston can be used for pressing oil, the lubricating oil in the crankcase can be actively returned, the oil return resistance can be reduced, and the oil return efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to an engine and a vehicle. Background Technology

[0002] The crankshaft converts the reciprocating motion of the piston into rotational motion, ultimately driving the wheels. The crankshaft's axis needs to remain in place, while simultaneously allowing it to rotate around its own axis. Therefore, bearing caps are required to fix the relative position of the crankshaft and guide its rotation.

[0003] However, during engine lubrication, the lubricating oil agitated by the crankshaft and the lubricating oil sprayed from the nozzle will generate more air bubbles under the action of the piston and cylinder wall, which will increase the resistance of the lubricating oil return. This will not only lead to a decrease in the return efficiency of the lubricating oil, but also easily cause noise problems. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide an engine with lower lubricating oil return resistance, higher return efficiency, and improved noise levels.

[0005] This application further proposes a vehicle employing the aforementioned engine.

[0006] In a first aspect, this application provides an engine, comprising: a cylinder block, a bearing cap, a crankshaft, and an oil return assembly. At least one cylinder is disposed within the cylinder block, and a piston is disposed within the cylinder. The cylinder block has a crankshaft space. The bearing cap is disposed within the cylinder block and connected to the cylinder block. A crankshaft through-hole is defined between the bearing cap and the cylinder block, and the bearing cap is sealed to the cylinder block. The crankshaft passes through the crankshaft through-hole. The oil return assembly is disposed above the oil return port of the cylinder block. The oil return assembly includes a one-way valve adapted to open when the gas pressure in the crankshaft space exceeds a pressure threshold.

[0007] According to the engine of the present application embodiment, the bearing cover and the cylinder block are sealed together, and an oil return component is provided. On the one hand, it can improve the blow-by between adjacent cylinders or relative cylinders, improve working noise and improve NVH performance, while reducing the impact of blow-by on the return of lubricating oil. On the other hand, it can avoid abnormal pressure in the crankcase, and with the piston downward pressing oil, it can realize the active return of lubricating oil in the crankcase, reduce the return oil resistance and improve the return oil efficiency.

[0008] According to some embodiments of this application, the cylinder block includes a first cylinder block and a second cylinder block, the first cylinder block and the second cylinder block are arranged opposite to each other in a first direction, each of the first cylinder block and the second cylinder block is provided with a cylinder bank, each cylinder bank includes at least one cylinder, and when the cylinder bank includes multiple cylinders, the multiple cylinders are arranged sequentially along a second direction, and the crankshaft is located between two cylinder banks.

[0009] According to some embodiments of this application, the oil return assembly further includes an oil baffle plate disposed in the crankshaft space and used to guide lubricating oil to the area where the oil return port is located.

[0010] According to some embodiments of this application, a first bearing seat is provided on the second cylinder block, and the bearing cover is positioned and connected to the first cylinder block positioning sleeve, and is sealed and connected to the first bearing seat to fix the crankshaft.

[0011] According to some embodiments of this application, the bearing cover is provided with a first sealing part on the side facing the first bearing seat, and the first bearing seat is provided with a second sealing part on the side facing the bearing cover. The first sealing part and the second sealing part are fitted together to form a sealing connection and define a labyrinth flow channel.

[0012] According to some embodiments of this application, both the first sealing part and the second sealing part are machined, and the fitting gap between the first sealing part and the second sealing part is 0mm~0.7mm.

[0013] According to some embodiments of this application, the first sealing portion includes at least one protrusion, and the second sealing portion includes at least one groove that mates with the protrusion.

[0014] According to some embodiments of this application, a sealing element is provided between the bearing cover and the first bearing housing to seal the gap between the first bearing housing and the bearing cover for a sealed connection.

[0015] According to some embodiments of this application, a baffle is provided in the first cylinder body, and the bearing cover is disposed between the two baffles. The baffles are sealed to the second cylinder body for a sealed connection.

[0016] Secondly, this application provides a vehicle including the engine described in the above embodiments.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of an engine according to an embodiment of this application; Figure 2 This is a schematic diagram of an angle of the bearing cover according to the first embodiment of this application; Figure 3 This is a schematic diagram of the bearing cover according to the first embodiment of this application from another angle; Figure 4 This is a schematic diagram of the cylinder block according to the first embodiment of this application; Figure 5 This is a cross-sectional schematic diagram of the cylinder block according to the first embodiment of this application; Figure 6 This is a cross-sectional schematic diagram of an engine according to an embodiment of this application; Figure 7 yes Figure 6 The center circle shows a magnified view of a portion of area A; Figure 8 This is a schematic diagram of the cylinder block, bearing cap, and seal according to the second embodiment of this application; Figure 9 This is a schematic diagram of the first cylinder block according to the third embodiment of this application.

[0019] Figure label: Engine 100, Cylinder block 10, first cylinder block 11, second cylinder block 12, first bearing housing 121, second sealing part 122. Bearing cover 20, first sealing part 21, Crankshaft 30, Oil return assembly 40, check valve 41, oil baffle 42 Seal 40, baffle 50, piston 60. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0022] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection 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 application according to the specific circumstances.

[0024] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0028] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0029] In this application, "multiple" means two or more (including two).

[0030] The bearing cap is a crucial structural component of an engine. The crankshaft converts the reciprocating motion of the piston into rotational motion, ultimately driving the output force. The crankshaft must be securely held in place while also allowing free rotation. This is achieved by the bearing cap, bolted to the engine block. Therefore, the bearing cap serves two functions: guiding and securing the crankshaft, and bearing the highest combustion forces and inertial loads generated in the engine.

[0031] The main features of the bearing cap are: it is fixed to the engine block with bolts through bolt holes. There are two main positioning methods: one is stop positioning, where the cylinder block side has grooves with dimensional accuracy, and the bearing cap side is also designed with corresponding machined surfaces with dimensional accuracy, and the two are used together; the other is positioning pin / sleeve positioning, where the bearing cap and cylinder block are equipped with positioning pins / sleeves, and the two are used together.

[0032] For high-speed engines, the lubricating oil thrown out when the crankshaft rotates rapidly (as well as the lubricating oil sprayed by the nozzle) will generate more air bubbles under the action of the piston and cylinder wall, making it difficult for the lubricating oil to fall back down.

[0033] Based on this, this application proposes an engine in which, by setting up an oil return component, the one-way valve can be opened when the pressure in the crankcase exceeds the pressure of the one-way valve, so as to realize the return of lubricating oil, thereby reducing the oil return resistance and improving the oil return efficiency.

[0034] Meanwhile, the use of an oil return assembly to achieve active oil return, i.e., forced oil pressure during piston downward movement, also places high demands on the sealing performance of the crankcase. This application enables a sealed connection between the bearing cap and the cylinder block, which can improve oil-gas leakage, prevent abnormal pressure rise in the crankcase, and also improve engine noise.

[0035] The following is for reference. Figures 1-9 This invention describes an engine 100 and a vehicle according to an embodiment of the present invention.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides an engine 100, including: a cylinder block 10, a bearing cover 20, a crankshaft 30, and an oil return assembly 40. At least one cylinder is disposed in the cylinder block 10, and a piston 60 is disposed in the cylinder. The cylinder block 10 has a crankshaft space. The bearing cover 20 is disposed in the cylinder block 10 and connected to the cylinder block 10. A crankshaft through-hole is defined between the bearing cover 20 and the cylinder block 10, and the bearing cover 20 is sealed to the cylinder block 10. The crankshaft 30 passes through the crankshaft through-hole. The oil return assembly 40 is disposed above the oil return port of the cylinder block 10. The oil return assembly 40 includes a one-way valve 41, which is adapted to open when the gas pressure in the crankshaft space exceeds a pressure threshold.

[0037] Specifically, the engine 100 in this embodiment can be any one of a horizontally opposed H-type engine, a V-type engine, or an inline L-type engine. A cylinder head can be installed on the cylinder block 10, and a crankshaft space is defined between the cylinder block 10 and the cylinder head. The crankshaft 30 is disposed in the crankshaft space and is pressed by a bearing cover 20 connected to the cylinder head. The bearing cover 20 is sealed to the cylinder block 10. There can also be two cylinder blocks 10, which together enclose the crankshaft space. Each cylinder block 10 is provided with a cylinder, and the cylinders in the two cylinder blocks 10 are arranged opposite each other. The bearing cover 20 is fixed on one of the cylinder blocks 10 and sealed to the other cylinder block 10, while also pressing the crankshaft 30.

[0038] Therefore, by sealing the bearing cap 20 with the cylinder block 10, blow-by between adjacent cylinders can be reduced. For example, cylinders located on both sides of the crankshaft 30 axis and arranged opposite each other (horizontally opposite), and cylinders arranged sequentially in the crankshaft 30 axis direction (in line L-shape), can improve the sealing between adjacent cylinders and reduce blow-by. This can not only prevent abnormal pressure rise in the crankcase and reduce the impact of blow-by on the lubricating oil return speed, but also improve the working noise of the engine 100 and improve NVH performance.

[0039] Furthermore, by setting an oil return assembly 40 above the oil return port of the cylinder block 10, it can work with the pressure generated by the downward movement of the piston 60 to achieve forced oil pressure during the downward movement of the piston 60, so that the internal pressure of the cylinder is greater than or equal to the opening pressure (i.e., pressure threshold) of the one-way valve 41. The one-way valve 41 opens and realizes active oil return, expelling oil and gas and lubricating oil from the crankcase. The reduced blow-by volume can also reduce the pressure loss caused by blow-by, and improve the oil return efficiency and oil return speed.

[0040] According to the embodiment of this application, the engine 100 is sealed to the cylinder block 10 through the bearing cover 20 and is equipped with an oil return component 40. On the one hand, it can improve the blow-by between adjacent cylinders or relative cylinders, improve working noise and improve NVH performance, while reducing the impact of blow-by on the return of lubricating oil. On the other hand, it can avoid abnormal pressure in the crankcase, and with the piston 60 pressing the oil downward, it can realize the active return of lubricating oil in the crankcase, reduce the return oil resistance and improve the return oil efficiency.

[0041] Combination Figure 1 Figure 4 , Figure 5 and Figure 6 As shown, according to some embodiments of this application, the cylinder block 10 includes a first cylinder block 11 and a second cylinder block 12. The first cylinder block 11 and the second cylinder block 12 are arranged opposite to each other in a first direction. Each cylinder block 11 and the second cylinder block 12 are provided with a cylinder bank. Each cylinder bank includes at least one cylinder. When the cylinder bank includes multiple cylinders, the multiple cylinders are arranged sequentially along a second direction. The crankshaft 30 is located between the two cylinder banks.

[0042] It is understandable that when the crankshaft 30 rotates rapidly, the lubricating oil thrown out will generate more bubbles under the action of the piston 60 and the cylinder wall, and it will be difficult to fall back, increasing the oil return resistance. In terms of the degree of influence on the oil return resistance, the horizontally opposed H-type engine > V-type engine > inline L-type engine. The active oil return (forced oil pressure by piston 60 downward) of the embodiment of this application can be used to improve the situation in combination with gas-liquid separation measures. In particular, for horizontally opposed engines, the effect of improving the difficulty of lubricating oil return is better. However, the independent sealing requirements between adjacent cylinders in the crankcase are relatively high.

[0043] Taking a horizontally opposed engine as an example, the cylinders are located on both sides of the crankshaft axis 30. The two rows of cylinders on each side can each have two cylinders (i.e., a horizontally opposed four-cylinder engine) or three cylinders (i.e., a horizontally opposed six-cylinder engine). Figure 1As shown, if the bearing cap 20 and bearing seat located between the two cylinder banks cannot be sealed, during the pulling of the pistons 60 on both sides, the upward piston 60 on one side will affect the oil pressure performance of the downward piston 60 on the other side, and may even cause oil pressure failure. This will also lead to low blow-by efficiency, abnormal increase in crankcase pressure, and rapid gas flow in the gap between the pistons 60 on both sides during the pulling of the pistons 60, which can easily lead to NVH problems.

[0044] Based on this, when the engine 100 is a horizontally opposed multi-cylinder engine, such as a horizontally opposed four-cylinder engine, a bearing cap 20 (defined as an intermediate bearing cap) is provided between two adjacent cylinders in the second direction in the same cylinder bank. The intermediate bearing cap is connected to the first cylinder block 11 and sealed to the second cylinder block 12 to improve blow-by and reduce the impact of the upward piston 60 on the downward piston 60's oil pressure, thereby improving the reliability and stability of active oil return.

[0045] In other words, this application further specifies that the engine 100 is a horizontally opposed engine, and the return oil resistance of the lubricating oil is relatively large. Active oil return can be achieved by the downward piston 60 in conjunction with the return oil assembly 40, which reduces the return oil resistance and improves the return oil efficiency. Furthermore, the sealing between the bearing cover 20 and the second cylinder block 12 improves blow-by. This not only reduces abnormal noise during engine 100 operation, but also reduces the impact of blow-by on active oil return, thereby improving the reliability and stability of active oil return.

[0046] like Figure 1 As shown, according to some embodiments of this application, the oil return assembly 40 further includes an oil baffle 42, which is disposed in the crankshaft space and is used to guide the lubricating oil to the area where the oil return port is located.

[0047] Combination Figure 1 As shown, when the engine 100 is ignited and combusted, the crankshaft 30 rotates clockwise at high speed along the view direction, generating a large amount of oil and gas in the crankcase. The lubricating oil is thrown out tangentially with the rotation of the crankshaft 30, blocked by the oil baffle 42 and collected at the oil return port. One piston 60 moves upward and the other piston 60 moves downward to compress the oil and gas in the crankcase. As the oil and gas pressure in the crankcase exceeds the opening pressure of the one-way valve 41, the one-way valve 41 opens, and the oil and gas and lubricating oil are discharged from the crankcase.

[0048] It is understandable that the one-way valve 41 can be constructed as an oil-gas separation one-way valve 41, which can not only realize the discharge of lubricating oil and oil-gas, but also realize gas-liquid separation, and further reduce the return oil resistance and improve the return oil efficiency.

[0049] Combination Figure 4 and Figure 5As shown, according to some embodiments of this application, a first bearing seat 121 is provided on the second cylinder block 12, and the bearing cover 20 is positioned and connected to the positioning sleeve of the first cylinder block 11, and is sealed and connected to the first bearing seat 121 to fix the crankshaft 30.

[0050] Specifically, the bearing cover 20 can be a powder metallurgy part, which is formed by pressing, sintering and machining, and is positioned with the first cylinder body 11 by a positioning sleeve and installed on the first bearing seat 121 to achieve clamping and fixing of the crankshaft 30 and rotation guidance. The bearing cover 20 and the first bearing seat 121 are constructed to form a sealed connection, which can improve the sealing between the relative cylinders and improve the active oil return effect.

[0051] like Figure 6 and Figure 7 As shown, in the first embodiment of this application, a first sealing part 21 is provided on the side of the bearing cover 20 facing the first bearing seat 121, and a second sealing part 122 is provided on the side of the first bearing seat 121 facing the bearing cover 20. The first sealing part 21 and the second sealing part 122 are fitted together to seal and connect, and define the labyrinth flow channel.

[0052] In other words, the first sealing part 21 can be constructed as a groove, and the corresponding second sealing part 122 can be constructed as a protrusion. For example, the first sealing part 21 on the bearing cover 20 is machined and designed to conform to the shape of the second sealing part 122. The concave and convex parts of the two can form a sealing flow channel, making the gas leakage path of oil and gas more complex, the leakage path length longer, and the leakage resistance greater, so as to achieve a relatively sealed technical effect and effectively reduce the amount of leakage.

[0053] It should be noted that both the first sealing part 21 and the second sealing part 122 are machined, and the fitting gap between the first sealing part 21 and the second sealing part 122 is 0mm~0.7mm.

[0054] For example, the fitting gap between the first sealing part 21 and the second sealing part 122 is 0 mm, 0.3 mm, 0.5 mm, 0.7 mm, etc.

[0055] In other words, the sealing gap between the first sealing part 21 and the second sealing part 122 should be as small as possible. The gap between the first sealing part 21 and the second sealing part 122 can be designed with a tolerance zone by calculating the dimensional chain and make it less than 0.7mm. Under the premise of realizing forced oil return and active oil return to reduce the difficulty of oil return in the horizontally opposed engine 100, the relative cylinders can maintain relative sealing to meet the opening pressure of the one-way valve 41.

[0056] According to some embodiments of this application, the first sealing portion 21 includes at least one protrusion, and the second sealing portion 122 includes at least one groove that mates with the protrusion.

[0057] In other words, in some embodiments, the first sealing part 21 has a protrusion and the corresponding second sealing part 122 has a groove for a concave-convex fit. In other embodiments, the number of protrusions can be two or more, and the number of concave parts can also be two or more, so as to further extend the labyrinth path through more concave-convex fit concave and protrusion parts to improve the sealing effect.

[0058] Of course, the sealing connection between the bearing cover 20 and the cylinder 10 in this application embodiment is not limited to the above-mentioned labyrinth seal. The second and third embodiments are used to illustrate two other optional sealing forms of this application. However, it should be understood that these are only illustrative examples and not an exhaustive list of feasible sealing methods.

[0059] like Figure 8 As shown, according to the second embodiment of this application, a sealing element 40 is provided between the bearing cover 20 and the first bearing seat 121 to seal the gap between the first bearing seat 121 and the bearing cover 20 for a sealed connection.

[0060] The sealing element 40 can be a rubber sealing strip. A sealing groove can be provided on the first bearing seat 121, and a sealing strip is provided on the bearing cover 20. The sealing strip is pressed into the sealing groove, and the gap between the first bearing seat 121 and the bearing cover 20 is sealed by the sealing element 40 to achieve a sealed connection between the bearing cover 20 and the first bearing seat 121. This can achieve the same technical effect as the first embodiment, and will not be described in detail here.

[0061] like Figure 9 As shown, according to the third embodiment of this application, a baffle 50 is provided inside the first cylinder 11, and a bearing cover 20 is disposed between the two baffles 50. The baffles 50 and the second cylinder 12 are sealed together for a sealed connection.

[0062] The baffle 50 can be integrated on the first cylinder 11. The end face of the baffle 50 facing the second cylinder 12 can be fitted with the surface of the second cylinder 12 facing the first cylinder 11 to achieve a seal. The bearing cover 20 is located in the space defined by the baffle 50, the first cylinder 11 and the second cylinder 12, realizing a sealed connection between the first cylinder 11 and the second cylinder 12. That is, the sealed connection between the bearing cover 20 and the cylinder 10 is achieved through the baffle 50, which can achieve the same technical effect as the first embodiment, and will not be described again here.

[0063] Furthermore, it can be understood that in the first embodiment, a labyrinth seal is used to achieve sealing between the relative cylinders. At this time, the gas pressure in the crankshaft space minus the leakage pressure of the labyrinth flow channel should be greater than or equal to the opening pressure of the one-way valve 41. In the second embodiment, the gas pressure in the crankshaft space minus the leakage pressure in the area where the seal 40 is located should be greater than or equal to the opening pressure of the one-way valve 41. In the third embodiment, the gas pressure in the crankshaft space minus the leakage pressure in the area of ​​the baffle 50 should be greater than or equal to the opening pressure of the one-way valve 41. This ensures that the one-way valve 41 can open under pressure and discharge lubricating oil and oil vapor when one piston 60 moves downward and the other piston 60 moves upward, thereby improving the reliability and stability of the active oil return.

[0064] This application provides a vehicle including the engine 100 in the above embodiments, which has the same effects as the engine 100 described above, and will not be repeated here.

[0065] The engine 100 and other components and operations of the vehicle according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An engine, characterized in that, include: A cylinder body (10) is provided with at least one cylinder, and a piston (60) is provided in the cylinder. The cylinder body (10) has a crankshaft space. Bearing cover (20), the bearing cover (20) is disposed inside the cylinder body (10) and connected to the cylinder body (10), the bearing cover (20) and the cylinder body (10) define a crankshaft through hole, and the bearing cover (20) and the cylinder body (10) are sealed together; A crankshaft (30) is provided, wherein the crankshaft (30) passes through the crankshaft through hole; Oil return assembly (40) is disposed above the oil return port of the cylinder block (10). The oil return assembly (40) includes a one-way valve (41) which is adapted to open when the gas pressure in the crankshaft space exceeds a pressure threshold.

2. The engine according to claim 1, characterized in that, The cylinder block (10) includes a first cylinder block (11) and a second cylinder block (12). The first cylinder block (11) and the second cylinder block (12) are arranged opposite to each other in a first direction. Each cylinder block (11) and the second cylinder block (12) is provided with a cylinder bank. Each cylinder bank includes at least one cylinder. When the cylinder bank includes multiple cylinders, the multiple cylinders are arranged sequentially along a second direction. The crankshaft (30) is located between the two cylinder banks.

3. The engine according to claim 1 or 2, characterized in that, The oil return assembly (40) further includes an oil baffle (42), which is disposed in the crankshaft space and is used to guide lubricating oil to the area where the oil return port is located.

4. The engine according to claim 2, characterized in that, The second cylinder (12) is provided with a first bearing seat (121), and the bearing cover (20) is positioned and connected to the positioning sleeve of the first cylinder (11) and sealed and connected to the first bearing seat (121) to fix the crankshaft (30).

5. The engine according to claim 4, characterized in that, The bearing cover (20) is provided with a first sealing part (21) on the side facing the first bearing seat (121), and the first bearing seat (121) is provided with a second sealing part (122) on the side facing the bearing cover (20). The first sealing part (21) and the second sealing part (122) are fitted together to seal and define the labyrinth flow channel.

6. The engine according to claim 5, characterized in that, Both the first sealing part (21) and the second sealing part (122) are machined, and the fitting gap between the first sealing part (21) and the second sealing part (122) is 0mm~0.7mm.

7. The engine according to claim 5, characterized in that, The first sealing portion (21) includes at least one protrusion, and the second sealing portion (122) includes at least one groove that mates with the protrusion.

8. The engine according to claim 4, characterized in that, A sealing element (40) is provided between the bearing cover (20) and the first bearing seat (121) to seal the gap between the first bearing seat (121) and the bearing cover (20) for a sealed connection.

9. The engine according to claim 2, characterized in that, The first cylinder (11) is provided with a baffle (50), and the bearing cover (20) is disposed between the two baffles (50). The baffles (50) are sealed to the second cylinder (12) for a sealed connection.

10. A vehicle, characterized in that, include: The engine according to any one of claims 1-9.

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