Engine and vehicle

Abstract

The utility model discloses an engine and a vehicle, the engine comprises a cylinder body, a timing cavity is formed in the cylinder body, and the cylinder body is provided with an oil pan located below the timing cavity; the cylinder cover and the cylinder body are connected and jointly define an oil return cavity, the oil return cavity is communicated with the timing cavity, an oil return hole is formed in the bottom wall of the oil return cavity, and the oil return hole is communicated with the oil pan; an oil return cavity bottom face distributed around the oil return hole is formed at the bottom of the oil return cavity, at least part of the side wall face, close to the cylinder body, of the oil return cavity is constructed to be an inner drainage wall, at least part of the side wall face, away from the cylinder body, of the oil return cavity is constructed to be an outer drainage wall, and the inner drainage wall is constructed to be obliquely arranged towards the oil return cavity bottom face from top to bottom. And the outer drainage wall is inclined towards the bottom surface of the oil return cavity from top to bottom. According to the engine, the inner drainage wall and the outer drainage wall which are inclined towards the bottom face of the oil return cavity are arranged in the oil return cavity, so that engine oil in the oil return cavity can be well guided to the bottom face of the oil return cavity, and the oil return efficiency of the two sides of the engine is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle manufacturing, in particular to an engine and a vehicle equipped with the engine. Background Art

[0002] At present, in-line and V-type engines are commonly installed in vehicles, while horizontally opposed engines are less developed. However, horizontally opposed engines have their own unique advantages. One is that the center of gravity is low, and the low center of gravity can increase the stability of the vehicle at high speeds, improve the turning performance, increase the grip, and thus enhance the driving safety. The other is that the cylinder layout is a symmetric and stable structure, and the first-order inertia forces and moments generated by the pistons in the two cylinders on both sides cancel each other out when the pistons move, making the engine operate more stably and smoothly, and improving the riding comfort.

[0003] During the use of some existing vehicles, a lot of engine oil will accumulate at the bottom of the timing cavity, thereby reducing the circulating oil volume of the lubrication system, resulting in the need to add more engine oil to the engine. Moreover, the timing chain will be immersed below the liquid level of the oil accumulation dead zone, and the timing chain stirs the engine oil to generate a large amount of oil and gas, increasing the burden on the crankcase ventilation system. Adding an oil pump installation structure on the cylinder block not only makes the structure more complex, but also occupies the layout space of other components, and the disadvantages of the overall machine weight and cost are obvious, so there is room for improvement. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an engine in which the oil flow rate on both sides is fast and the oil return efficiency is high, which can avoid the formation of oil accumulation dead zones at both cylinder heads, and does not affect the circulating oil volume of the lubrication system, saves the engine oil filling amount, and can prevent the problem of the timing chain stirring the oil, reduce the amount of oil and gas, and reduce the burden on the crankcase ventilation system.

[0005] The engine according to an embodiment of the utility model includes: a cylinder block, in which a timing cavity is formed, and an oil pan is provided below the timing cavity in the cylinder block; a cylinder head, which is connected to the cylinder block and together defines an oil return cavity, the oil return cavity is communicated with the timing cavity, an oil return hole is formed in the bottom wall of the oil return cavity, and the oil return hole is communicated with the oil pan; wherein, an oil return cavity bottom surface distributed around the oil return hole is formed at the bottom of the oil return cavity, at least part of the side wall surface of the oil return cavity close to the cylinder block is constructed as an inner drainage wall and at least part of the side wall surface away from the cylinder block is constructed as an outer drainage wall, the inner drainage wall is constructed to be inclined downward from top to bottom towards the oil return cavity bottom surface, and the outer drainage wall is constructed to be inclined downward from top to bottom towards the oil return cavity bottom surface.

[0006] According to the engine of the embodiment of the present utility model, by respectively arranging sunken oil return cavities on both sides of the engine, and arranging an inner drainage wall and an outer drainage wall inclined towards the bottom surface of the oil return cavity in the oil return cavity, the engine oil in the oil return cavity can be well guided to the bottom surface of the oil return cavity, so as to effectively improve the oil return efficiency on both sides of the engine, avoid the formation of oil dead zones in the cylinder head, and will not affect the circulating oil volume of the lubrication system, save the engine oil filling amount, effectively avoid the risk of low oil pressure, ensure that the whole machine has good lubrication performance, and can prevent the problem of the timing chain stirring oil, reduce the amount of oil and gas, and reduce the burden on the crankcase ventilation system.

[0007] According to the engine of some embodiments of the present utility model, the side wall surface of the oil return cavity close to the cylinder block further includes an inner edge surface connected above the inner drainage wall, the inner edge surface is arranged to incline downwards from top to bottom close to the bottom surface of the oil return cavity, and the inclination angle of the inner edge surface relative to the bottom surface of the oil return cavity is A1, and satisfies: 10° ≤ A1 ≤ 30°.

[0008] According to the engine of some embodiments of the present utility model, the inclination angle of the inner drainage wall relative to the horizontal direction is A4, and satisfies: 25° ≤ A4 ≤ 70°.

[0009] According to the engine of some embodiments of the present utility model, the side wall surface of the oil return cavity far from the cylinder block further includes an outer edge surface connected above the outer drainage wall, the outer edge surface is higher than the bottom surface of the oil return cavity, and the height difference between the outer edge surface and the bottom surface of the oil return cavity is L1, and satisfies: 15 mm ≤ L1 ≤ 30 mm.

[0010] According to the engine of some embodiments of the present utility model, the outer drainage wall is configured as an inclined curved surface, and the slope of the inclined curved surface increases from small to large and then gradually decreases from top to bottom.

[0011] According to the engine of some embodiments of the present utility model, the inclination angle of the inclined curved surface relative to the horizontal direction is A2, and satisfies: 30° ≤ A2 ≤ 60°.

[0012] According to the engine of some embodiments of the present utility model, it further includes: an oil return pipe, the oil return pipe is connected to the bottom of the cylinder head, and is used to communicate the oil return hole with the oil pan.

[0013] According to the engine of some embodiments of the present utility model, the inclination angle of the extending direction of the oil return pipe relative to the horizontal plane is B1, and satisfies: B1 ≥ 30°.

[0014] According to an engine of some embodiments of the present invention, an installation hole communicating with the oil return hole is provided at the bottom of the oil return cavity. The upper end of the oil return pipe is detachably installed at the installation hole through a connecting member, and a sealing member is provided between the oil return pipe and the inner wall of the installation hole.

[0015] The present invention also provides a vehicle.

[0016] According to a vehicle of an embodiment of the present invention, an engine of any one of the above embodiments is provided.

[0017] The vehicle and the above-mentioned engine have the same advantages over the prior art, which will not be elaborated here.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is the front view of an engine according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a partial structure of an engine according to an embodiment of the present invention Figure 1 ;

[0022] Figure 3 is a schematic diagram of a partial structure of an engine according to an embodiment of the present invention Figure 2 ;

[0023] Figure 4 is a schematic diagram of the structure of an oil return pipe of an engine according to an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the structure of the left oil return pipe of an engine according to an embodiment of the present invention.

[0025] Reference Numerals:

[0026] Engine 100,

[0027] Cylinder block 1, timing cavity 11, oil pan 12, oil return port 121, left oil return port 122, cylinder head 2, oil return cavity 21, internal drainage wall 22, bottom surface of oil return cavity 23, external drainage wall 24, inner edge surface 25, outer edge surface 26, oil return hole 27, mounting hole 271, left cylinder head 3, left oil return cavity 31, left oil return hole 35, oil return pipe 4, first connection joint 41, first connection hole 411, first connecting piece 412, first mounting groove 42, seal 43, second connection joint 44, right gasket 45, corrugated section 46, left oil return pipe 5, third connection joint 51, third connection hole 511, second connecting piece 512, second mounting groove 52, left seal 53, fourth connection joint 54, left gasket 55, timing chain 6, timing sprocket 7. Detailed implementation mode

[0028] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0029] In the description of the present invention, 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. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] Unless otherwise specified, the front-to-back direction in the present application is the longitudinal direction of the vehicle, that is, the X direction; the left-right direction is the lateral direction of the vehicle, that is, the Y direction; and the up-down direction is the vertical direction of the vehicle, that is, the Z direction.

[0032] Reference below Figures 1 - 5 The engine 100 according to the embodiment of the utility model is described. By respectively arranging sunken oil return chambers 21 on both sides of the engine 100, and arranging the inner guide wall 22 and the outer guide wall 24 inclined toward the bottom surface 23 of the oil return chamber in the oil return chamber 21, the oil on the periphery of the oil return chamber 21 can be well guided to the bottom surface 23 of the oil return chamber, so as to effectively improve the oil return efficiency on both sides of the engine 100. The utility model has a simple structure and good diversion effect, and can avoid the cylinder head 2 from generating an oil storage dead zone, and will not affect the circulating oil amount of the lubrication system, saving the oil filling amount, and can prevent the timing chain 6 from stirring the oil, reduce the oil and gas amount, and reduce the burden on the crankcase ventilation system.

[0033] like Figures 1 - 5 As shown, an engine 100 according to an embodiment of the present invention includes: a cylinder block 1 and a cylinder head 2 .

[0034] A timing chamber 11 is formed in the cylinder body 1, and the cylinder body 1 is provided with an oil pan 12 located below the timing chamber 11. Specifically, the cylinder body 1 is the main part of the engine 100, and a combustion chamber and a piston movement chamber are formed in the cylinder body 1, and a timing chamber 11 is formed on one side of the cylinder body 1. The timing chamber 11 is used to accommodate structures such as a timing chain 6 and a timing sprocket 7. An oil pan 12 is provided on the lower side of the cylinder body 1. The oil pan 12 and the timing chamber 11 are spaced apart and distributed in the upper and lower directions. The oil pan 12 is a storage container for the engine oil of the engine 100, and is used to collect and store the engine oil of the engine 100. When the engine 100 is working, the engine oil can be transported to various components of the engine 100 by an oil pump to provide lubrication, cooling and cleaning to ensure the safe operation of each component.

[0035] The cylinder head 2 is connected to the cylinder block 1 and defines an oil return chamber 21 together. The oil return chamber 21 is communicated with the timing chamber 11 . An oil return hole 27 is formed on the bottom wall of the oil return chamber 21 , and the oil return hole 27 is communicated with the oil pan 12 .

[0036] Specifically, the engine 100 in this embodiment is a horizontally opposed engine 100, with two cylinder heads 2, and the two cylinder heads 2 are connected to the two sides of the cylinder body 1 in a horizontal direction, such as the two cylinder heads 2 are distributed on the two sides of the cylinder body 1 in a left-right direction, and the timing chamber 11 is located on the front side of the engine 100. The two ends of the cylinder body 1 are respectively closed by the two cylinder heads 2, and the two cylinder heads 2 usually include components such as valves, spark plugs or injectors.

[0037] Among them, in the vertical direction, the upper sides of the two cylinder heads 2 are the intake sides, and the lower sides of the two cylinder heads 2 are the exhaust sides. The lower side regions of the two cylinder heads 2 and the cylinder block 1 define two oil return cavities 21. The upper ends of the two oil return cavities 21 are communicated with the timing cavity 11, and oil return holes 27 are respectively provided on the bottom walls of the two oil return cavities 21 and are connected to the oil pan 12 through the oil return holes 27. In this way, the engine oil at the timing cavity 11 can flow to the oil pan 12 through the oil return holes 27 of the two oil return cavities 21, realizing the collection of engine oil.

[0038] Thus, by respectively arranging two oil return cavities 21 in the lower side regions of the two cylinder heads 2, the oil return cavities 21 can be configured as sunken structures. In this way, it is beneficial for the engine oil in the oil return cavities 21 to flow to the oil return holes 27 by gravity, thereby improving the oil return efficiency of the engine oil on the left and right sides of the timing cavity 11.

[0039] Among them, an oil return cavity bottom surface 23 distributed around the oil return hole 27 is formed at the bottom of the oil return cavity 21. At least part of the side wall surface of the oil return cavity 21 close to the cylinder block 1 is configured as an inner drainage wall 22, and at least part of the side wall surface far from the cylinder block 1 is configured as an outer drainage wall 24. The inner drainage wall 22 is configured to be inclined downward from top to bottom towards the oil return cavity bottom surface 23, and the outer drainage wall 24 is configured to be inclined downward from top to bottom towards the oil return cavity bottom surface 23.

[0040] Specifically, as Figure 2 and Figure 3 shown, oil return cavity bottom surfaces 23 are respectively provided at the bottoms of the two oil return cavities 21, enabling the engine oil on both sides of the engine 100 to flow back to the corresponding oil return cavities 21 respectively and be accommodated above the oil return cavity bottom surfaces 23 thereof. The two oil return cavity bottom surfaces 23 are respectively distributed around the corresponding oil return holes 27, enabling the oil liquid on the oil return cavity bottom surfaces 23 to enter the oil return holes 27, so as to guide the engine oil in the oil return cavities 21 into the oil pan 12.

[0041] Specifically, both the inner drainage wall 22 and the outer drainage wall 24 have the function of guiding the engine oil to flow along a specific path. Part of the structure of the inner wall of the oil return cavity 21 close to the cylinder block 1 is formed as the inner drainage wall 22. The inner drainage wall 22 can be configured as an inclined structure and is inclined from top to bottom towards the oil return hole 27. In this way, the engine oil at the cylinder block 1 and the timing cavity 11 can flow from the inside to the outside along the inner drainage wall 22 towards the oil return cavity 21 and the oil return hole 27.

[0042] Among them, the inclination angles of the inner drainage walls 22 of the two oil return cavities 21 can be the same or different. In this embodiment, the amounts of oil in the two oil return cavities 21 are different, and the inclination angle of the inner drainage wall 22 with more oil relative to the horizontal direction is greater than the inclination angle of the inner drainage wall 22 with less oil relative to the horizontal direction. That is to say, the guiding effect of the inner drainage wall 22 with a larger inclination angle can be made greater than the guiding effect of the inner drainage wall 22 with a smaller inclination angle, that is, the oil return efficiency of the two oil return cavities 22 can be balanced.

[0043] And at least part of the structure of the oil return cavity 21 away from the outer wall of the cylinder block 1 is formed as an outer drainage wall 24. The outer drainage wall 24 and the inner drainage wall 22 are distributed on the outer periphery of the bottom surface 23 of the oil return cavity. And the outer drainage wall 24 and the inner drainage wall 22 can be relatively connected to the upper side of the bottom surface 23 of the oil return cavity. The outer drainage wall 24 can be constructed as an inclined structure and is inclined downward to the oil return hole 27 from top to bottom, realizing the drainage of the engine oil outside the oil return cavity 21.

[0044] Furthermore, the engine oil at the cylinder block 1 and the timing cavity 11 can flow from the outside to the inside along the outer drainage wall 24 to the oil return cavity 21 and the oil return hole 27. And combined with the guiding action of the inner drainage wall 22, the engine oil outside the oil return cavity 21 is all guided in a direction inclined towards the center of the oil return cavity 21, which can effectively improve the oil return efficiency of the engine oil, and has a simple structure and good guiding effect.

[0045] Thus, for the horizontally opposed engine 100, with the double timing sprockets 7 provided, the exhaust sides of the two cylinder heads 2 are relatively low, and the part of the cavity lower than the oil return passage inlet of the cylinder block 1 becomes an oil accumulation dead zone, which will affect the oil return efficiency. In this embodiment, by respectively arranging sunken oil return cavities 21 on both sides of the engine 100, the oil return efficiency on both sides of the engine 100 can be respectively improved, the oil accumulation dead zone of the cylinder head 2 can be avoided, and it will not affect the circulating oil volume of the lubrication system, saving the engine oil filling amount. And the timing chain 6 will not be soaked in the oil accumulation dead zone, resulting in the problem of the timing chain 6 stirring the oil, reducing the oil and gas volume, reducing the burden on the crankcase ventilation system. And the inner drainage wall 22 and the outer drainage wall 24 inclined towards the bottom surface 23 of the oil return cavity are respectively arranged in the oil return cavity 21, which can well guide the engine oil in the oil return cavity 21 to the bottom surface 23 of the oil return cavity, effectively improving the oil return efficiency of the engine oil, having a simple structure and good guiding effect, improving the structural responsiveness, effectively avoiding the risk of low oil pressure, and ensuring that the whole machine has good lubrication performance.

[0046] In some embodiments, one side wall surface of the oil return cavity 21 close to the cylinder block 1 further includes an inner side edge surface 25 connected above the inner drainage wall 22. The inner side edge surface 25 is set to be inclined downward from top to bottom close to the bottom surface 23 of the oil return cavity, and the inclination angle of the inner side edge surface 25 relative to the bottom surface 23 of the oil return cavity is A1, and it satisfies: 10°≤A1≤30°

[0047] Specifically, the inner wall of the oil return cavity 21 is further provided with an inner side edge surface 25. The inner side edge surface 25 is connected to the upper end of the inner drainage wall 22. The inner side edge surface 25 is constructed as an inclined surface and is inclined downward from top to bottom to the bottom surface 23 of the oil return cavity to realize the drainage of the engine oil inside the timing cavity 11. And it has a simple structure and is convenient for processing.

[0048] Among them, as Figure 1 and Figure 2As shown, the inclination angle of the inner edge surface 25 relative to the bottom surface 23 of the oil return cavity can take values such as: 10°, 15°, 20°, 25°, 30°, etc. By setting the above several values, the engine oil inside the cylinder block 1 can flow from the inside to the outside along the inner edge surface 25 and the inner drainage wall 22 into the oil return cavity 21. During the flowing process, the gravitational potential energy of the engine oil can be quickly converted into kinetic energy, so that the engine oil can be quickly discharged into the oil return cavity 21. And when the inclination angle is too small, it is not conducive to guiding the engine oil in the cylinder block 1 to be quickly discharged. When the inclination angle is too large, a too thin sharp corner is formed at the edge of the oil return cavity 21, resulting in insufficient structural strength. And the inclination angle of the inner edge surface 25 relative to the bottom surface 23 of the oil return cavity is not limited to those listed in this embodiment and can be selectively set according to the actual space and structural characteristics.

[0049] And a transition arc is provided at the connection between the inner edge surface 25 and the inner drainage wall 22, which can make the connection between the two smooth and improve the smoothness of the oil flow.

[0050] In some embodiments, the inclination angle of the inner drainage wall 22 relative to the horizontal direction is A4, and it satisfies: 25° ≤ A4 ≤ 70°. That is, in actual design, the inclination angle of the inner drainage wall 22 relative to the horizontal direction can be set to 25°, 30°, 35°, 40°, 45°, 50°, 60°, 70°, etc. By setting the above several values, the engine oil inside the cylinder block 1 can flow from the inside to the outside along the inner drainage wall 22 into the oil return cavity 21, so that the engine oil can be quickly discharged into the oil return cavity 21. And the inclination angle of the inner drainage wall 22 relative to the horizontal direction is not limited to those listed in this embodiment and can be selectively set according to the actual space and structural characteristics. And the inclination angle of the inner drainage wall 22 can be greater than the inclination angle of the outer drainage wall 24. In this way, the engine oil brought by the timing chain 6 to the side close to the cylinder block 1 can quickly flow along the inner drainage wall 22 into the oil return cavity 21, improving the oil return efficiency on the right side of the engine 100.

[0051] Among them, it should be noted that when the inclination angle of the inner drainage wall 22 is too small, the oil flow rate will be small. On the one hand, it is not conducive to quickly draining to the oil pan 12, and on the other hand, it is not conducive to the flow of the engine oil in the posture where the engine 100 is inclined to the left. When the inclination angle of the inner drainage wall 22 is too large, the space size and weight of the oil return cavity 21 will increase, which is not conducive to improving the system integration.

[0052] In some embodiments, the side wall surface of the oil return cavity 21 away from the cylinder block 1 further includes an outer edge surface 26 connected above the outer drainage wall 24. The outer edge surface 26 is higher than the bottom surface 23 of the oil return cavity, and the height difference between the outer edge surface 26 and the bottom surface 23 of the oil return cavity is L1, and it satisfies: 15 mm ≤ L1 ≤ 30 mm.

[0053] Specifically, an outer edge surface 26 is further provided on the inner wall of the oil return cavity 21. The outer edge surface 26 is connected to the upper end of the outer drainage wall 24. The outer edge surface 26 can be configured as a plane, and the outer edge surface 26 needs to be higher than the bottom surface 23 of the oil return cavity, that is, a height difference is formed between the two, so that an oil storage space can be formed between the two. At the same time, the bottom surface 23 of the oil return cavity is relatively low to realize the sunken setting of the oil return cavity 21. In this way, under the action of the inertial movement of the timing chain 6 and the gravity of the engine oil, the oil on the outer edge surface 26 and its outside can be quickly drained to the bottom surface 23 of the oil return cavity, so as to improve the oil return effect of the engine oil.

[0054] Among them, the height between the outer edge surface 26 and the bottom surface 23 of the oil return cavity can be set to 15mm, 18mm, 20mm, 25mm, 30mm, etc. By setting the above several values, there is enough space between the outer edge surface 26 and the bottom surface 23 of the oil return cavity in the vertical direction to improve the oil storage volume of the oil return cavity 21. And when the engine 100 is running at high speed and high load, a large flow of engine oil can also be quickly discharged into the oil return cavity 21, avoiding the oil stirring of the timing chain 6 and improving the operation reliability of the engine 100. And the height difference between the bottom surface 23 of the oil return cavity and the outer edge surface 26 is not limited to those listed in this embodiment, and can be selectively set according to the actual space and structural characteristics.

[0055] If the height difference between the bottom surface 23 of the oil return cavity and the outer edge surface 26 is too small, the effect of the engine oil in the cylinder head 2 being drained by gravity will be poor. If the height difference between the bottom surface 23 of the oil return cavity and the outer edge surface 26 is too large, the horizontal height of the inlet of the oil return hole 27 needs to be relatively low, which is not conducive to forming a height difference between the oil return hole 27 and the liquid level of the oil pan 12, and then makes the fluidity of the engine oil poor and is not conducive to the oil return of the engine oil.

[0056] In addition, it should be noted that the outer edge surface 26 can be configured as an inclined surface, and an included angle between the outer edge surface 26 and the bottom surface 23 of the oil return cavity is in the range of 20° to 30°. And an arc is provided at the connection between the outer edge surface 26 and the outer drainage wall 24. By setting the included angle, the gravitational potential energy of the engine oil entering the oil return cavity 21 can be quickly converted into kinetic energy to improve the flow rate of the engine oil flowing to the outer drainage wall 24.

[0057] In some embodiments, the outer drainage wall 24 is configured as an inclined curved surface, and the slope of the inclined curved surface increases first from top to bottom and then gradually decreases. That is to say, the inclination of the outer drainage wall 24 first gradually increases from small and then gradually decreases, which can guide the flow rate of the engine oil to increase first from small and then gradually decrease, and can quickly drain the engine oil at the outer edge surface 26 and the engine oil outside it.

[0058] Specifically, such as Figure 2As shown, in the longitudinal sectional view, the inclined surface may include three sections of surfaces. The slope of the first section of the inclined surface gradually increases, the slope of the second section of the inclined surface remains unchanged, and the third section of the inclined surface gradually decreases. Moreover, the convex directions of the surfaces of the first section and the third section are opposite. The first section protrudes towards the center of the oil return cavity 21, and the third section protrudes away from the center of the oil return cavity 21. In this way, the slope of the inclined surface can change from gentle to steep and then to gentle, enabling the engine oil to accelerate smoothly first, then increase the flow rate, and finally decrease the flow rate of the engine oil to reduce the impact on the bottom surface 23 of the oil return cavity, thereby improving the flow rate of the engine oil. And the structure is simple, reasonable, and has a good drainage effect.

[0059] Among them, as Figure 1 and Figure 2 shown, the inclination angle of the inclined surface relative to the horizontal direction is A2, and it satisfies: 30° ≤ A2 ≤ 60°. That is, in actual design, the inclination angle of the inclined surface relative to the horizontal direction can be set to gradually increase from 30° to 60° first, and then gradually decrease from 60° to 30°, enabling the setting of the inclination angle of the inclined surface. Among them, the inclination angle can take values such as: 30°, 35°, 40°, 45°, 50°, 60°, etc. With such a setting, the slope of the inclined surface can be continuous, and the inclination angle of the inclined surface relative to the horizontal direction is not limited to that described in this embodiment and can be selected and set according to actual needs.

[0060] Moreover, when the inclination angle of the inclined surface relative to the horizontal direction is too small, it will cause a relatively small flow rate of the engine oil. On the one hand, it is not conducive to the rapid drainage of the engine oil to the oil pan 12, and on the other hand, it is not conducive to the flow of the engine oil in the posture where the engine 100 is tilted to the right. When the inclination angle of the inclined surface relative to the horizontal direction is too large, it will increase the space size and weight of the oil return cavity 21 of the cylinder head 2, which is not conducive to improving system integration.

[0061] In some embodiments, the engine 100 further includes an oil return pipe 4. The oil return pipe 4 is connected to the bottom of the cylinder head 2 and is used to connect the oil return hole 27 with the oil pan 12. In this way, the engine oil in the cylinder head 2 can flow back into the oil pan 12 through the oil return pipe 4.

[0062] Specifically, the bottom of the cylinder head 2 and the cylinder block 1 define an oil return cavity 21. The oil return cavity 21 is connected to the upper end of the oil return pipe 4 through the oil return hole 27, and the lower end of the oil return pipe 4 is connected to the oil pan 12. Moreover, the cylinder head 2 on the other side can also be connected to the oil pan 12 through the oil return pipe 4, and the installation methods of the oil return pipes 4 on both sides are the same. In this way, both oil return cavities 21 can be connected to the oil pan 12 through the external oil return pipe 4, enabling the engine oil at the timing cavity 11 to flow to the oil pan 12 through the oil return cavity 21 and the oil return pipe 4, realizing the collection of the engine oil at the cylinder head 2 and the cylinder block 1.

[0063] Thus, by providing an external oil return pipe 4 between the oil return chambers 21 on both sides and the oil pan 12, the engine oil in the two oil return chambers 21 can be directly introduced into the oil pan 12 without passing through the inside of the cylinder block 1, improving the structural responsiveness, effectively avoiding the risk of low oil pressure, and ensuring good lubrication performance of the whole machine.

[0064] In addition, the two external oil return pipes 4 can reduce the connection problems between the cylinder heads 2 on both sides and the oil pan 12, and there is no need to provide an oil return passage between the two cylinder heads 2 and the cylinder block 1, reducing weight, cost, and the space dimensions of the two cylinder heads 2 and the cylinder block 1, leaving space for arranging other components, and greatly improving the integration of the engine 100.

[0065] In some embodiments, the extension direction of the oil return pipe 4 is inclined at an angle B1 with respect to the horizontal plane, and it satisfies: B1≥30°.

[0066] Specifically, as Figure 1 shown, the oil return pipe 4 extends along the inclined direction, and the inclination angle with respect to the horizontal plane is set as B1, and the inclination angle of the oil return pipe 4 can be set as 30°, 35°, 40°, etc. By setting these values, the engine oil can flow back from the oil return chamber 21 to the oil pan 12 in an inclined direction, and the greater the inclination angle, the smoother the oil return by gravity, ensuring the normal oil return function at the cylinder head 2 when the vehicle is driving with a low-speed side tilt.

[0067] Moreover, the oil return pipe 4 on the other side can also be set to extend along the inclined direction and the inclination angle with the horizontal plane is B2, and the extension directions of the oil return pipes 4 on both sides with respect to the horizontal plane can be the same, and the oil return pipes 4 on both sides extend inclined towards each other to respectively improve the engine oil return speed of the cylinder heads 2 on both sides of the engine 100, enhancing the engine oil return efficiency on the right side of the engine 100 and ensuring the normal driving of the vehicle.

[0068] Among them, the extension directions of the oil return pipes 4 on both sides with respect to the horizontal plane can also be different, and the inclination angles of the two are not limited to those listed above, and can be selectively set according to actual needs.

[0069] In some embodiments, an installation hole 271 communicating with the oil return hole 27 is provided at the bottom of the oil return chamber 21, the upper end of the oil return pipe 4 is detachably installed at the installation hole 271 through a connecting piece, and a sealing member 43 is provided between the oil return pipe 4 and the inner wall of the installation hole 271.

[0070] Specifically, as Figure 2 shown, an oil return hole 27 penetrating in the up and down direction is provided at the bottom of the oil return chamber 21, the oil return hole 27 is provided with a communicating installation hole 271 at the bottom, the upper end of the oil return pipe 4 extends into the installation hole 271, and as Figure 4As shown, a first connection joint 41 is provided at the upper end of the oil return pipe 4. The first connection joint 41 is provided with a first connection hole 411. Correspondingly, the cylinder head 2 is provided with a second connection hole extending in the up and down direction. The second connection hole and the first connection hole 411 are used to pass through a first connecting member 412. And a first installation groove 42 is provided at the upper end of the oil return pipe 4 for installing a seal 43. The first installation groove 42 is recessed toward the axis of the oil return pipe 4.

[0071] Further, the seal 43 can be set as an O-ring, and the first connecting member 412 is a connecting bolt. During installation, the seal 43 is sleeved in the first installation groove 42, and the upper end of the oil return pipe 4 is extended into the installation hole 271. The first connecting member 412 is passed through the first connection hole 411 and is threadedly connected to the second connection hole, so as to realize the reliable connection between the oil return pipe 4 and the oil return cavity 21. And by providing the seal 43, the seal 43 can be respectively in pressing fit with the inner wall of the installation hole 271 and the first installation groove 42 of the oil return pipe 4, making the seal between the oil return pipe 4 and the oil return cavity 21 more reliable. Among them, the connecting bolt can be selected from M5 to M8, which can minimize the structural size and weight of the oil return pipe 4 and the oil return cavity 21 while meeting the fastening requirements of the oil return pipe 4. And a second connection joint 44 is provided at the outlet end of the oil return pipe 4. The connection joint is also provided with two connection holes for threaded connection with the oil pan 12. And a right-side gasket 45 is provided on the second connection joint 44, which is provided with metal corrugated sealing ribs. The right-side gasket 45 is closely attached to the flange surfaces of the oil return pipe 4 and the oil return port 121. And the oil return pipe 4 is connected to the oil pan 12 by two connecting bolts, with reliable connection and good sealing performance.

[0072] Among them, the sealing force generated by the mutual compression of the seal 43 and the inner wall of the installation hole 271 is at least greater than six times the liquid pressure in the cavity of the oil return cavity 21. After the seal 43 is matched with the first installation groove 42, it has sufficient compression rate and filling rate to effectively improve the sealing performance of the seal 43.

[0073] And it should be noted that the inner diameter of the oil return pipe 4 is generally set to 12mm - 20mm, that is, it can be set to 12mm, 14mm, 16mm, 18mm, 20mm, etc. Setting within the above range is conducive to the rapid flow of engine oil through the oil return pipe 4 and improves the oil return efficiency. Among them, if the diameter of the oil return pipe 4 is too small, it will cause insufficient oil return capacity, and even lead to insufficient circulating oil volume of the engine 100. And when the diameter of the oil return pipe 4 is too large, it will not only increase the weight of the oil return pipe 4, but also occupy the layout space of other components, which is not conducive to improving system integration.

[0074] Moreover, the diameter of the seal 43 is generally 20% larger than the inner diameter of the oil return pipe 4, and can be set to 17 mm. The wire diameter of the seal 43 is generally 10% - 20% of its diameter, and usually 2 mm - 3 mm is selected, which can improve the sealing compression performance of the seal 43. Among them, when the wire diameter of the seal 43 is too small, the rubber cannot generate enough compression, which is not conducive to sealing. And when the wire diameter of the seal 43 is too large, it will increase the size of related structures such as the first installation groove 42, which is not conducive to structural compactness.

[0075] In addition, it should be noted that the compression ratio is the ratio of the compression deformation of the seal 43 to the wire diameter. The groove depth dimension of the first installation groove 42 is used to limit the compression ratio. The groove depth dimension of the first installation groove 42 can be set to be 20% - 30% smaller than the wire diameter of the seal 43, and the optimal is 25%. The larger the compression ratio, the more reliable the sealing. Of course, the compression ratio cannot be set too high, as it will increase the elastic deformation of the seal 43 and reduce the service life. The filling rate is the ratio of the cross-sectional area of the seal 43 to the cross-sectional area of the first installation groove 42, and is usually set between 70% - 95%, and the optimal is 85%. The product of the groove depth dimension and the groove width dimension of the first installation groove 42 is the cross-sectional area of the first installation groove 42. In actual design, these two dimensions are limited to obtain the target filling rate. The higher the filling rate, the greater the friction force between the seal 43 and the first installation groove 42, and the better the sealing performance. However, it cannot be set too large, as it will cause uneven stress on the seal 43, resulting in deformation and damage of the seal 43.

[0076] Among them, the cylinder head 2 of the engine 100 includes a left cylinder head 3 and a right cylinder head. The oil return cavity 21 includes a left oil return cavity 31 and a right oil return cavity, and the oil return pipe 4 includes a left oil return pipe 5 and a right oil return pipe. The above description is for the right structure, and the installation method of the left oil return pipe 5 is the same as that of the right oil return pipe.

[0077] Specifically, as Figure 3 shown, a left oil return hole 35 penetrating in the up and down direction is provided at the bottom of the left oil return cavity 31. The upper end of the left oil return pipe 5 extends into the left oil return hole 35. And as Figure 5 shown, a third connection joint 51 is provided at the upper end of the left oil return pipe 5. The third connection joint 51 is provided with a third connection hole 511. Correspondingly, the left cylinder head 3 is provided with a fourth connection hole extending in the up and down direction. The third connection hole 511 and the fourth connection hole are used to penetrate a second connecting piece 512. And a second installation groove 52 is provided at the upper end of the left oil return pipe 5 for installing a left seal 53. The second installation groove 52 is recessed toward the axis of the left oil return pipe 5.

[0078] Further, the left seal 53 can be set as an O-ring seal, and the second connecting member 512 is a connecting bolt. During installation, the left seal 53 is sleeved in the second installation groove 52, and the upper end of the left oil return pipe 5 is extended into the left oil return hole 35. The second connecting member 512 is passed through the third connecting hole 511 and threadedly connected to the fourth connecting hole, which can realize the reliable connection between the left oil return pipe 5 and the left oil return chamber 31. And by setting the left seal 53, the left seal 53 can be respectively in pressing fit with the inner wall of the left oil return hole 35 and the second installation groove 52 of the left oil return pipe 5, making the seal between the left oil return pipe 5 and the left oil return chamber 31 more reliable. Among them, the connecting bolt can be selected from M5 to M8, which can minimize the structural dimensions and weight of the left oil return pipe 5 and the left oil return chamber 31 while meeting the fastening requirements of the left oil return pipe 5.

[0079] And a fourth connection joint 54 is provided at the outlet end of the left oil return pipe 5. The fourth connection joint 54 also has two connection holes for threadedly connecting with the oil pan 12. And a left gasket 55 is provided on the fourth connection joint 54, which is provided with metal corrugated sealing ribs. The left gasket 55 is closely attached to the flange surfaces of the left oil return pipe 5 and the left oil return port 122, and the left oil return pipe 5 is connected to the oil pan 12 through two connecting bolts, with reliable connection and good sealing performance.

[0080] Among them, it should be noted that the oil return pipe 4 is a thin-walled metal pipe provided with a corrugated section 46. The structure of the corrugated section 46 has a certain amount of deformability. Since both ends of the oil return pipe 4 are rigidly connected to the cylinder head 2 and the cylinder block 1, the corrugated pipe can reduce stress concentration through micro-deformation, which is beneficial to the seal between the seal 43 and the installation hole 271. Among them, the left oil return pipe 5 has the same structural setting as the oil return pipe 4, which can also improve the seal between the left seal 53 and the left oil return hole 35. Among them, the oil return pipe 4 is provided with one corrugated section 46 structure, and the left oil return pipe 5 is provided with three corrugated sections 46.

[0081] And the wall thickness of the corrugated section 46 of the oil return pipe 4 and the left oil return pipe 5 is generally set between 0.4 and 1.0 mm, and the optimal value is 0.6 mm. When the wall thickness of the corrugated section 46 is too thin, the structure will be weak and prone to cracking under the vibration of the engine 100. And when the wall thickness of the corrugated section 46 is too thick, it is not conducive to the corrugated section 46 to exert its own large deformation characteristics, and the corrugation forming is difficult and the processability is poor. At the same time, it is not conducive to the lightweight of the whole machine. And the length of the oil return pipe 4 is usually between 220 and 280 mm. If its length is too long, the oil will have too much heat loss due to the external environment, and there is a risk of oil emulsification during cold start of the engine 100 in the north in winter. And if the length is too small, an effective height difference cannot be formed, which is not conducive to gravity oil return.

[0082] The present utility model also proposes a vehicle.

[0083] A vehicle according to an embodiment of the present utility model is provided with the engine 100 of any one of the above embodiments. By respectively arranging sunken oil return cavities 21 on both sides of the engine 100, the oil return efficiency on both sides of the engine 100 can be respectively improved, the oil storage dead zones on both sides of the cylinder head 2 can be avoided, and the circulating oil volume of the lubrication system is not affected, the amount of oil filling is saved, and the problem of the timing chain 6 stirring oil can be prevented, the amount of oil and gas is reduced, the burden on the crankcase ventilation system is reduced, and an inner drainage wall 22 and an outer drainage wall 24 inclined towards the bottom surface 23 of the oil return cavity are arranged in the oil return cavity 21, so that the engine oil outside the oil return cavity 21 can be well guided to the bottom surface 23 of the oil return cavity, enabling the whole machine to have good lubrication performance. And arranging an external oil return pipe 4 can directly introduce the engine oil into the oil pan 12, which can reduce the setting of the internal oil return channel, reduce the weight and cost.

[0084] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0085] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An engine, characterized in that, Comprising: A cylinder block, a timing chamber is formed inside the cylinder block, and an oil pan is provided at the cylinder block below the timing chamber; A cylinder head, the cylinder head is connected to the cylinder block and jointly defines an oil return chamber, the oil return chamber is communicated with the timing chamber, an oil return hole is formed on the bottom wall of the oil return chamber, and the oil return hole is communicated with the oil pan; Wherein, an oil return chamber bottom surface distributed around the oil return hole is formed at the bottom of the oil return chamber, at least part of the side wall surface of the oil return chamber close to the cylinder block is configured as an inner drainage wall and at least part of the side wall surface away from the cylinder block is configured as an outer drainage wall, the inner drainage wall is configured to be inclined downward from top to bottom towards the oil return chamber bottom surface, and the outer drainage wall is configured to be inclined downward from top to bottom towards the oil return chamber bottom surface.

2. The engine according to claim 1, characterized in that, The side wall surface of the oil return chamber close to the cylinder block further includes an inner edge surface connected above the inner drainage wall, the inner edge surface is arranged to be inclined downward from top to bottom towards the oil return chamber bottom surface, and the inclination angle of the inner edge surface relative to the oil return chamber bottom surface is A1, and satisfies: 10° ≤ A1 ≤ 30°.

3. The engine according to claim 2, characterized in that, The inclination angle of the inner drainage wall relative to the horizontal direction is A4, and satisfies: 25° ≤ A4 ≤ 70°.

4. The engine according to claim 1, characterized in that, The side wall surface of the oil return chamber away from the cylinder block further includes an outer edge surface connected above the outer drainage wall, the outer edge surface is higher than the oil return chamber bottom surface, and the height difference between the outer edge surface and the oil return chamber bottom surface is L1, and satisfies: 15mm ≤ L1 ≤ 30mm.

5. The engine according to claim 4, characterized in that, The outer drainage wall is configured as an inclined curved surface, and the slope of the inclined curved surface increases from small to large and then gradually decreases from top to bottom.

6. The engine according to claim 5, characterized in that, The inclination angle of the inclined curved surface relative to the horizontal direction is A2, and satisfies: 30° ≤ A2 ≤ 60°.

7. The engine according to claim 1, characterized in that Further comprising: An oil return pipe, the oil return pipe is connected to the bottom of the cylinder head and is used to communicate the oil return hole with the oil pan.

8. The engine according to claim 7, characterized in that, The extension direction of the oil return pipe is inclined at an angle B1 relative to the horizontal plane, and satisfies: B1 ≥ 30°.

9. The engine according to claim 7, characterized in that, An installation hole communicated with the oil return hole is provided at the bottom of the oil return chamber, the upper end of the oil return pipe is detachably installed at the installation hole through a connecting piece, and a sealing member is provided between the oil return pipe and the inner wall of the installation hole.

10. A vehicle, characterized in that, An engine according to any one of claims 1-9 is provided.

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