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, an oil return cavity oil weir protruding upwards is arranged on the oil return cavity bottom face, and oil on the inner side wall of the oil return cavity is suitable for flowing to the oil return hole after being shunted by the oil return cavity oil weir. According to the engine, oil storage dead areas can be prevented from being generated at cylinder covers on the two sides, the problem of oil stirring of a timing chain can be solved, the oil gas amount is reduced, the burden of a crankcase ventilation system is reduced, the protruding oil return cavity oil weir is arranged on the bottom face of the oil return cavity, the flow speed of oil in the oil return cavity can be further increased, and the service life of the engine is prolonged. The risk of low engine oil pressure is effectively avoided, and it is guaranteed that the whole machine has good lubricating performance.

Description

Technical Field

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

[0002] At present, in-line and V-type engines are generally installed in vehicles, and the development of horizontally opposed engines is less. However, horizontally opposed engines have their own unique advantages. One is that the center of gravity is low. A low center of gravity can increase the stability of the vehicle at high speed, improve the turning performance, increase the grip, and thus improve the driving safety. The other is that the cylinder layout is a symmetric and stable structure. When the piston moves, the first-order inertia forces and moments generated by the cylinders on both sides cancel each other out, and the engine runs more stably and smoothly, improving the ride and 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. The timing chain will be immersed below the liquid level of the oil accumulation dead zone. The timing chain stirs the engine oil, generating a large amount of oil and gas, increasing the burden on the crankcase ventilation system. Adding an oil pump installation structure to the cylinder block not only makes the structure more complex, but also occupies the layout space of other components. The overall weight and cost are significantly disadvantaged, and there is room for improvement. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides an engine. The oil flow velocity on both sides of the engine is fast and the oil return efficiency is high. It can avoid the formation of oil accumulation dead zones at both sides of the cylinder head, and does not affect the circulating oil volume of the lubrication system, saving the engine oil filling amount. Moreover, it 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, a timing cavity is formed in the cylinder block, and an oil pan is provided at the cylinder block below the timing cavity; a cylinder head, the cylinder head is connected to the cylinder block and jointly 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 surrounding the oil return hole is formed at the bottom of the oil return cavity, an oil return cavity oil weir protruding upward is provided on the oil return cavity bottom surface, and the oil liquid on the inner side wall of the oil return cavity is adapted to flow to the oil return hole after being shunted by the oil return cavity oil weir.

[0006] For an engine according to an embodiment of the present utility model, by respectively arranging sunken oil return cavities on both sides of the engine, the oil return efficiency on both sides of the engine can be respectively improved, oil storage dead zones at the cylinder heads on both sides can be avoided, the circulating oil volume of the lubrication system is not affected, the oil filling amount is saved, the problem of the timing chain churning oil can be prevented, the oil and gas amount is reduced, the burden on the crankcase ventilation system is reduced, and a protruding oil return cavity oil weir is arranged on the bottom surface of the oil return cavity, so that the flow rate of the oil liquid in the oil return cavity can be further increased to improve the structural responsiveness, effectively avoiding the risk of low oil pressure and ensuring that the whole machine has good lubrication performance.

[0007] For an engine according to some embodiments of the present utility model, first oil drain grooves and second oil drain grooves located on both sides of the oil return cavity oil weir are further formed at the bottom of the oil return cavity, and the oil liquid in the oil return cavity is adapted to flow to the oil return hole through the first oil drain groove, the oil return cavity oil weir and the second oil drain groove respectively.

[0008] For an engine according to some embodiments of the present utility model, the oil return cavity oil weir includes an oil return cavity oil weir front side surface, an oil return cavity oil weir arc surface and an oil return cavity oil weir rear side surface. The oil return cavity oil weir front side surface is formed on one side of the oil return cavity oil weir facing the first oil drain groove and is connected to the inner wall of the first oil drain groove. The oil return cavity oil weir rear side surface is formed on one side of the oil return cavity oil weir facing the second oil drain groove and is connected to the inner wall of the second oil drain groove. The oil return cavity oil weir arc surface is formed on one side of the oil return cavity oil weir facing the oil return hole.

[0009] For an engine according to some embodiments of the present utility model, at least part of the wall surface of one side of the oil return cavity close to the cylinder block is configured as an inner drainage wall, and at least part of the wall surface of the other side away from the cylinder block is configured as an outer drainage wall;

[0010] Wherein, the outer drainage wall includes a connected first drainage front arc surface and a first drainage rear arc surface. The first drainage front arc surface extends to be connected to the first oil drain groove and is adapted to direct the flow towards the first oil drain groove. The first drainage rear arc surface extends to be connected to the second oil drain groove and is adapted to direct the flow towards the second oil drain groove.

[0011] For an engine according to some embodiments of the present utility model, the top surface of the oil return cavity oil weir is configured as a drainage plane, and the oil return cavity oil weir front side surface, the oil return cavity oil weir arc surface and the oil return cavity oil weir rear side surface respectively intersect with the drainage plane.

[0012] For an engine according to some embodiments of the present utility model, the oil return cavity oil weir is located on the bottom surface of the oil return cavity on the side of the oil return hole away from the cylinder block.

[0013] An engine according to some embodiments of the present utility model further includes: a return oil pipe, the return oil pipe is connected to the bottom of the cylinder head and is used to communicate the oil return hole with the oil pan.

[0014] For the engine according to some embodiments of the present utility model, the angle at which the extending direction of the return oil pipe is inclined relative to the horizontal plane is B1, and it satisfies: B1≥30°.

[0015] For the engine according to some embodiments of the present utility model, an installation hole communicating with the oil return hole is provided at the bottom of the oil return cavity, the upper end of the return oil pipe is detachably installed at the installation hole through a connecting member, and a sealing member is provided between the return oil pipe and the inner wall of the installation hole.

[0016] The present utility model also proposes a vehicle.

[0017] For the vehicle according to the embodiments of the present utility model, an engine as described in any one of the above embodiments is provided.

[0018] The advantages of the vehicle and the above-mentioned engine over the prior art are the same and will not be elaborated here.

[0019] Some of the additional aspects and advantages of the present utility model will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0021] Figure 1 is the front view of the engine according to the embodiment of the present utility model;

[0022] Figure 2 is the partial structure schematic diagram of the engine according to the embodiment of the present utility model Figure 1 ;

[0023] Figure 3 is the partial structure schematic diagram of the engine according to the embodiment of the present utility model Figure 2 ;

[0024] Figure 4 is the structural schematic diagram of the return oil pipe of the engine according to the embodiment of the present utility model;

[0025] Figure 5 is the structural schematic diagram of the left return oil pipe of the engine according to the embodiment of the present utility model;

[0026] Figure 6 is the partial cross-sectional view of the oil return cavity of the engine according to the embodiment of the present utility model.

[0027] Reference numerals:

[0028] engine 100,

[0029] 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, inner drainage wall 22, bottom surface of oil return cavity 23, oil weir in oil return cavity 231, front side surface of oil weir in oil return cavity 232, arc surface of oil weir in oil return cavity 233, rear side surface of oil weir in oil return cavity 234, drainage plane 235, outer drainage wall 24, first front drainage arc surface 241, first rear drainage arc surface 242, oil return hole 27, mounting hole 271, first oil drain groove 28, second oil drain groove 29,

[0030] 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 member 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 member 512, second mounting groove 52, left seal 53, fourth connection joint 54, left gasket 55, timing chain 6, timing sprocket 7. Detailed implementation manners

[0031] 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 denote the same or similar elements or elements having the same or similar functions throughout. 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.

[0032] 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, and are 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 thus 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 "a plurality" is two or more.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] Unless otherwise specified, the front-back direction in this application is the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction is the transverse direction of the vehicle, i.e., the Y direction; and the up-down direction is the vertical direction of the vehicle, i.e., the Z direction.

[0035] The following refers to Figures 1 - 6 Describe the engine 100 according to an embodiment of the present utility model. 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 dead zones at both sides of the cylinder head 2 can be avoided, and the circulating oil volume of the lubrication system will not be affected, saving the engine oil filling amount. Moreover, the problem of the timing chain 6 stirring oil can be prevented, reducing the oil and gas volume, reducing the burden on the crankcase ventilation system. And by arranging a protruding oil weir 231 on the bottom surface 23 of the oil return cavity, the flow rate of the oil in the oil return cavity 21 can be further increased to improve the structural responsiveness, effectively avoiding the risk of low oil pressure and ensuring that the whole machine has good lubrication performance.

[0036] As Figures 1 - 6 As shown, the engine 100 according to an embodiment of the present utility model includes: a cylinder block 1 and a cylinder head 2.

[0037] A timing cavity 11 is formed in the cylinder block 1. The cylinder block 1 is provided with an oil pan 12 located below the timing cavity 11. Specifically, the cylinder block 1 is the main part of the engine 100. Combustion chambers and piston movement cavities are formed in the cylinder block 1. And a timing cavity 11 is formed on one side of the cylinder block 1. The timing cavity 11 is used to accommodate structures such as a timing chain 6 and a timing sprocket 7. The oil pan 12 is provided on the lower side of the cylinder block 1. The oil pan 12 and the timing cavity 11 are spaced apart in the up-down direction. The oil pan 12 is a storage container for the engine oil of the engine 100, used to collect and store the engine oil of the engine 100. When the engine 100 is working, the engine oil can be delivered to each component of the engine 100 through an oil pump to provide lubrication, cooling, and cleaning to ensure the safe operation of each component.

[0038] The cylinder head 2 is connected to the cylinder block 1 and jointly defines an oil return cavity 21. The oil return cavity 21 is communicated with the timing cavity 11. An oil return hole 27 is formed on the bottom wall of the oil return cavity 21. The oil return hole 27 is communicated with the oil pan 12.

[0039] Specifically, the engine 100 in this embodiment is specifically a horizontally opposed engine 100. There are two cylinder heads 2, and the two cylinder heads 2 are horizontally opposed and connected to both sides of the cylinder block 1. For example, the two cylinder heads 2 are horizontally opposed and distributed on both sides of the cylinder block 1 in the left-right direction, and the timing cavity 11 is located on the front side of the engine 100. The two cylinder heads 2 respectively seal the two ends of the cylinder block 1, and the two cylinder heads 2 generally include components such as valves, spark plugs or fuel injectors.

[0040] Among them, in the up-down 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 communicate with the timing cavity 11, and oil return holes 27 are respectively provided on the bottom walls of the two oil return cavities 21. Through the oil return holes 27, they are connected to the oil pan 12. 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.

[0041] Therefore, 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 a sunken structure. 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.

[0042] 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. The oil return cavity bottom surface 23 is provided with an oil return cavity weir 231 protruding upward. The oil liquid on the inner side wall of the oil return cavity 21 is adapted to flow to the oil return hole 27 after being shunted by the oil return cavity weir 231. In this way, part of the oil liquid can be guided to flow into the oil return hole 27 from the oil return cavity weir 231, and a large amount of oil liquid can be prevented from accumulating in the oil return cavity 21, affecting the oil return speed of the engine oil.

[0043] Specifically, as Figure 2 and Figure 3 shown, the bottom of each of the two oil return cavities 21 is provided with an oil return cavity bottom surface 23, which can enable the engine oil on both sides of the engine 100 to flow back to the corresponding oil return cavity 21 and be accommodated above the oil return cavity bottom surface 23 thereof, and the two oil return cavity bottom surfaces 23 are respectively distributed around the corresponding oil return holes 27, which can enable the oil liquid on the oil return cavity bottom surface 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.

[0044] And as Figure 6As shown, the oil weir 231 of the oil return cavity is provided between the oil return cavity 21 and the oil return hole 27, and the oil weir 231 of the oil return cavity protrudes upward from the bottom surface 23 of the oil return cavity, which can increase the flow height of the oil in the oil return cavity 21. In this way, part of the engine oil entering the oil return cavity 21 flows to the oil weir 231 of the oil return cavity, which can achieve the diversion of the engine oil, and the flow rate of the engine oil flowing to the oil return hole 27 can be increased after passing through the oil weir 231 of the oil return cavity, thereby increasing the flow rate of the engine oil. Its structure is simple and the diversion effect is good.

[0045] Therefore, for the horizontally opposed engine 100, the double timing sprockets 7 are provided, making the exhaust sides of the two cylinder heads 2 lower. 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 providing 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 the circulating oil volume of the lubrication system will not be affected, saving the engine oil filling amount. Moreover, 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 by providing a protruding oil weir 231 on the bottom surface 23 of the oil return cavity, the flow rate of the oil in the oil return cavity 21 can be further increased to improve the structural responsiveness, effectively avoiding the risk of low engine oil pressure and ensuring that the whole machine has good lubrication performance.

[0046] In some embodiments, the bottom of the oil return cavity 21 further forms a first oil drain groove 28 and a second oil drain groove 29 located on both sides of the oil weir 231 of the oil return cavity. The oil in the oil return cavity 21 is adapted to flow to the oil return hole 27 through the first oil drain groove 28, the oil weir 231 of the oil return cavity and the second oil drain groove 29 respectively.

[0047] Specifically, as Figure 6 shown, in the front-rear direction, the bottom of the oil return cavity 21 forms a relatively distributed first oil drain groove 28 and a second oil drain groove 29. The first oil drain groove 28 and the second oil drain groove 29 are respectively connected to the front and rear sides of the oil weir 231 of the oil return cavity. In this way, the first oil drain groove 28, the first oil weir 231 of the oil return cavity and the second oil drain groove 29 are distributed in sequence from front to back to respectively achieve the diversion function. Among them, the first oil drain groove 28 and the second oil drain groove 29 can be configured to be open upward, which is conducive to the flow of the oil in the first oil drain groove 28 and the second oil drain groove 29.

[0048] Therefore, through the above settings, the oil can flow to the oil return hole 27 from the oil weir 231 of the oil return cavity, the first oil drain groove 28 and the second oil drain groove 29 respectively. The oil can be divided into three components to reduce the flow resistance of the oil, and good diversion and directional guidance can be achieved through the set path, thereby increasing the rate of the engine oil return.

[0049] In some embodiments, the oil weir 231 of the oil return chamber includes a front side surface 232 of the oil weir of the oil return chamber, an arc surface 233 of the oil weir of the oil return chamber, and a rear side surface 234 of the oil weir of the oil return chamber. As Figure 6 shown, the front side surface 232 of the oil weir of the oil return chamber is formed on the side of the oil weir 231 of the oil return chamber facing the first oil drain groove 28 and is in contact with the inner wall of the first oil drain groove 28, which can enable the front side surface 232 of the oil weir of the oil return chamber and the first oil drain groove 28 to support each other, realize the connection between the oil weir 231 of the oil return chamber and the first oil drain groove 28, and the first oil drain groove 28 is supported and connected to the inner wall of the oil return chamber 21, thereby improving the structural strength of the oil return chamber 21. Among them, an arc connection is provided between the front side surface 232 of the oil weir of the oil return chamber and the first oil drain groove 28, which can improve the structural strength and the structural connection is smooth, making the oil flow more stable.

[0050] As Figure 6 shown, the rear side surface 234 of the oil weir of the oil return chamber is formed on the side of the oil weir 231 of the oil return chamber facing the second oil drain groove 29 and is in contact with the inner wall of the second oil drain groove 29, which can enable the rear side surface 234 of the oil weir of the oil return chamber and the second oil drain groove 29 to support each other, realize the connection between the oil weir 231 of the oil return chamber and the second oil drain groove 28, and the second oil drain groove 28 is supported and connected to the inner wall of the oil return chamber 21, thereby improving the structural strength of the oil return chamber 21. Among them, an arc connection is provided between the rear side surface 234 of the oil weir of the oil return chamber and the second oil drain groove 29, which can improve the structural strength and the structural connection is smooth, making the oil flow more stable.

[0051] As Figure 6 shown, the arc surface 233 of the oil weir of the oil return chamber is formed on the side of the oil weir 231 of the oil return chamber facing the oil return hole 27 and is supported and connected to the bottom surface 23 of the oil return chamber in the up and down direction, which can enable the arc surface 233 of the oil weir of the oil return chamber and the bottom surface 23 of the oil return chamber to support each other, improve the connection strength between the oil weir 231 of the oil return chamber and the bottom surface 23 of the oil return chamber, and an arc connection is provided between the arc surface 233 of the oil weir of the oil return chamber and the bottom surface 23 of the oil return chamber, which can improve the structural strength and the structural connection is smooth, making the oil flow more stable.

[0052] Among them, if the arc surface 233 of the oil weir of the oil return chamber is set to be circular arc, and the front side surface 232 of the oil weir of the oil return chamber and the rear side surface 234 of the oil weir of the oil return chamber can be set to extend in the left and right directions, and the arc surface 233 of the oil weir of the oil return chamber can be set to be 40% - 60% of the width of the oil return chamber 21, and a spacing is formed between the front side surface 232 of the oil weir of the oil return chamber and the rear side surface 234 of the oil weir of the oil return chamber, which can increase the width of the oil return section by more than 2 times to improve the oil return speed.

[0053] In some embodiments, at least part of the side wall surface of the oil return chamber 21 close to the cylinder block 1 is configured as an inner drainage wall 22 and at least part of the side wall surface away from the cylinder block 1 is configured as an outer drainage wall 24.

[0054] Specifically, both the inner drainage wall 22 and the outer drainage wall 24 have the function of guiding engine oil to flow along a specific path. A part of the structure of the oil return cavity 21 near the inner wall of 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 incline 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 inside to outside along the inner drainage wall 22 towards the oil return cavity 21 and the oil return hole 27.

[0055] 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 that 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.

[0056] And at least a part of the structure of the outer wall of the oil return cavity 21 away from the cylinder block 1 is formed as the 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 configured as an inclined structure and incline from top to bottom towards the oil return hole 27 to achieve the drainage of the engine oil outside the oil return cavity 21.

[0057] Furthermore, the engine oil at the cylinder block 1 and the timing cavity 11 can flow from outside to inside along the outer drainage wall 24 towards the oil return cavity 21 and the oil return hole 27. Combined with the guiding effect of the inner drainage wall 22, the engine oil in the oil return cavity 21 is 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 drainage effect.

[0058] Among them, the outer drainage wall 24 includes a connected first drainage front arc surface 241 and a first drainage rear arc surface 242. The first drainage front arc surface 241 extends to connect with the first oil drain groove 28 and is suitable for guiding the flow towards the first oil drain groove 28, and the first drainage rear arc surface 242 extends to connect with the second oil drain groove 29 and is suitable for guiding the flow towards the second oil drain groove 29.

[0059] Specifically, the first drainage front arc surface 241 is connected to the first oil drain groove 28, which can make the oil flow along the first drainage front arc surface 241 towards the first oil drain groove 28, and the first drainage rear arc surface 242 is connected to the second oil drain groove 29, which can make the oil flow along the first drainage rear arc surface 242 towards the second oil drain groove 29. Thus, by setting the first drainage front arc surface 241 and the first drainage rear arc surface 242, the width of the oil return section can be increased by more than 50%, and when the oil passes through the outer drainage wall 24, the oil is guided to flow in two directions by the first drainage front arc surface 241 and the first drainage rear arc surface 242, reducing the oil return burden.

[0060] Furthermore, due to the action of gravity, the amount of oil at the center of the outer drainage wall 24 is more than that on both sides. By setting the oil weir 231 of the oil return cavity, the oil flow velocity at the center can be increased. Combining the diversion of the oil by the first oil drain groove 28 and the second oil drain groove 29 can make the oil flow velocity faster.

[0061] As Figure 6 shown, in the front-rear direction, the first drainage front arc surface 241 is formed on the front side of the oil return cavity 21, and the first drainage rear arc surface 242 is formed on the rear side of the oil return cavity 21. Among them, both the first drainage front arc surface 241 and the first drainage rear arc surface 242 can be constructed as arc surfaces, and their structures are simple and convenient to process.

[0062] In some embodiments, the top surface of the oil weir 231 of the oil return cavity is constructed as a drainage plane, and the front side surface 232 of the oil weir of the oil return cavity, the arc surface 233 of the oil weir of the oil return cavity, and the rear side surface 234 of the oil weir of the oil return cavity intersect with the drainage plane respectively.

[0063] Specifically, as Figure 6 shown, the oil weir 231 of the oil return cavity further includes a top surface, and the top surface is constructed as a drainage plane, and the drainage plane can be distributed in parallel with the bottom surface 23 of the oil return cavity. Among them, the front side surface 232 of the oil weir of the oil return cavity, the arc surface 233 of the oil weir of the oil return cavity, and the rear side surface 234 of the oil weir of the oil return cavity are distributed around the drainage plane respectively, and the three intersect with the drainage plane. They can intersect perpendicularly or at an angle greater than 90°, which can make the top surface of the oil weir 231 of the oil return cavity protrude from the bottom surface 23 of the oil return cavity. Its setting methods are diverse and can be set according to space requirements. Among them, arc connections are provided between the drainage plane and the front side surface 232 of the oil weir of the oil return cavity, the arc surface 233 of the oil weir of the oil return cavity, and the rear side surface 234 of the oil weir of the oil return cavity, which can improve the structural strength and the structural connection is smooth, making the oil flow more stable.

[0064] In this way, part of the oil entering the oil weir 231 of the oil return cavity can be guided to the oil return hole 27 through the drainage plane, and the other part of the oil flows to the oil return hole 27 along the first oil drain groove and the second oil drain groove to realize the diversion and guidance of the oil.

[0065] Moreover, by setting the top surface of the oil weir 231 of the oil return cavity to protrude from the bottom surface 23 of the oil return cavity, a height difference is formed between the two, and the height difference is in the range of 3 mm to 5 mm, which can make the oil form a drop between the top of the oil weir 231 of the oil return cavity and the bottom surface 23 of the oil return cavity to increase the flow velocity of the engine oil flowing to the oil return hole 27.

[0066] It should be noted that if the height between the oil weir 231 of the oil return chamber and the bottom surface 23 of the oil return chamber is too high, it may cause a "hydraulic jump" effect, resulting in reverse agitation of the oil, increasing the velocity loss. Moreover, the distance between the oil weir 231 of the oil return chamber and the oil return hole 27 is in the range of 3 mm to 6 mm. The shorter the distance, the more beneficial it is to reduce the frictional resistance along the way. However, if it is too short, it is not conducive to the smooth transition of the engine oil from the oil weir 231 of the oil return chamber to the oil return hole 27.

[0067] In some embodiments, the oil weir 231 of the oil return chamber is located on the bottom surface 23 of the oil return chamber on the side of the oil return hole 27 away from the cylinder block 1, that is, the oil weir 231 of the oil return chamber is located on the side of the oil return hole 27 close to the cylinder head 2. The cylinder head 2 is connected to the outside of the cylinder block 1. As Figure 6 shown, the oil weir 231 of the oil return chamber is located in the outer region of the oil return hole 27. In this way, the engine oil in the outer region of the cylinder head 2 can be shunted through the oil weir 231 of the oil return chamber, and the oil return velocity of the engine oil at the cylinder head 2 can be effectively increased to improve the oil flow velocity of the overall oil return chamber 21. Moreover, an oil weir 231 can also be provided in the other oil return chamber 21 to increase the oil return velocity of the engine oil in the oil return chamber 21 on the other side of the engine.

[0068] 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.

[0069] Specifically, the bottom of the cylinder head 2 and the cylinder block 1 define an oil return chamber 21. The oil return chamber 21 is communicated with the upper end of the oil return pipe 4 through the oil return hole 27. The lower end of the oil return pipe 4 is connected to the oil pan 12. Moreover, the other cylinder head 2 can also be connected to the oil pan 12 through the oil return pipe 4. The installation methods of the oil return pipes 4 on both sides are the same. In this way, the two oil return chambers 21 can be connected to the oil pan 12 through the external oil return pipes 4, so that the engine oil at the timing chamber 11 flows through the oil return chamber 21 and the oil return pipe 4 to the oil pan 12, realizing the collection of the engine oil at the cylinder head 2 and the cylinder block 1.

[0070] Therefore, by providing external oil return pipes 4 between the two oil return chambers 21 and the oil pan 12 on both sides, 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 that the whole machine has good lubrication performance.

[0071] In addition, the two external oil return pipes 4 can reduce the connection problems between the two cylinder heads 2 and the oil pan 12. Moreover, there is no need to provide an oil return passage between the two cylinder heads 2 and the cylinder block 1, reducing the weight, cost, and the spatial 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.

[0072] 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°.

[0073] 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. The inclination angle of the oil return pipe 4 can be set to 30°, 35°, 40°, etc. By setting these values, the engine oil can flow back from the oil return cavity 21 to the oil pan 12 in an inclined direction, and the greater the inclination angle, the smoother the oil return by the action of gravity, which can ensure the normal oil return function at the cylinder head 2 when the vehicle is driving with a low-speed roll.

[0074] 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. The extension directions of the oil return pipes 4 on both sides are inclined with respect to the horizontal plane at the same angle, and the oil return pipes 4 on both sides extend inclined towards each other, so as to respectively improve the engine oil return speed of the cylinder heads 2 on both sides of the engine 100, enhance the engine oil return efficiency on the right side of the engine 100, and ensure the normal driving of the vehicle.

[0075] Wherein, the extension directions of the oil return pipes 4 on both sides are inclined with respect to the horizontal plane at different angles, and the inclination angles of the two are not limited to those listed above, and can be selectively set according to actual needs.

[0076] In some embodiments, an installation hole 271 communicating with the oil return hole 27 is provided at the bottom of the oil return cavity 21. The upper end of the oil return pipe 4 is detachably installed at the installation hole 271 through a connecting member, and a sealing member 43 is provided between the oil return pipe 4 and the inner wall of the installation hole 271.

[0077] 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 cavity 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 4 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 for passing through a first connecting member 412. Moreover, a first installation groove 42 for installing the sealing member 43 is provided at the upper end of the oil return pipe 4, and the first installation groove 42 is recessed towards the axis of the oil return pipe 4.

[0078] Further, the seal 43 can be set as an O-ring seal, 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 connecting hole 411 and threadedly connected to the second connecting hole, so as to realize the reliable connection between the oil return pipe 4 and the oil return cavity 21. And by setting 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 dimensions 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 connecting joint 44 is provided at the outlet end of the oil return pipe 4. The connecting joint also has two connecting holes for threadedly connecting with the oil pan 12. And a right-side gasket 45 is provided on the second connecting 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 through two connecting bolts, with reliable connection and good sealing performance.

[0079] Among them, the sealing force generated by the mutual pressure between 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 fitted with the first installation groove 42, it has sufficient compression rate and filling rate to effectively improve the sealing performance of the seal 43.

[0080] In addition, it should be noted that the inner diameter of the oil return pipe 4 is generally set to 12 mm to 20 mm, that is, it can be set to 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 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 the system integration.

[0081] And the diameter of the seal 43 is usually 20% larger than the inner diameter of the oil return pipe 4, that is, it can be set to 17 mm, and the wire diameter of the seal 43 is generally 10% to 20% of its diameter, usually selected as 2 mm to 3 mm, 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 amount, which is not conducive to sealing. And when the wire diameter of the seal 43 is too large, it will increase the dimensions of related structures such as the first installation groove 42, which is not conducive to structural compactness.

[0082] In addition, it should be noted that the compression ratio is the ratio of the compression deformation amount 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 value is 25%. The greater the compression ratio, the more reliable the seal. Of course, the compression ratio cannot be set too high, as this 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%, with the optimal value being 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, the two dimensions are restricted 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 this will cause uneven stress on the seal 43, resulting in deformation and damage of the seal 43.

[0083] 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-side structure, and the installation method of the left oil return pipe 5 is the same as that of the right oil return pipe.

[0084] 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 towards the axis of the left oil return pipe 5.

[0085] 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 extends 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 cavity 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 cavity 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 cavity 31 while meeting the fastening requirements of the left oil return pipe 5.

[0086] And at the outlet end of the left oil return pipe 5, there is a fourth connecting joint 54. The fourth connecting joint 54 also has two connecting holes for threaded connection with the oil pan 12. And a left gasket 55 is provided on the fourth connecting 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.

[0087] Among them, it should be noted that the oil return pipe 4 is a thin-walled metal pipe 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.

[0088] 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 play its own characteristic of large deformation, 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 to the external environment, and there is a risk of oil emulsification during the 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.

[0089] The present utility model also proposes a vehicle.

[0090] 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, the circulating oil volume of the lubrication system is not affected, the engine oil filling amount is saved, the problem of oil stirring by the timing chain 6 can be prevented, the oil and gas volume is reduced, the burden on the crankcase ventilation system is reduced, and a protruding oil weir 231 of the oil return cavity is arranged on the bottom surface 23 of the oil return cavity, so that the flow velocity of the oil in the oil return cavity 21 can be further increased to improve the structural responsiveness and effectively avoid the risk of low engine oil pressure, ensuring that the whole machine has good lubrication performance. In addition, 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.

[0091] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. means 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.

[0092] 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 principles and purposes 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 cavity is formed inside the cylinder block, and an oil pan is provided at the cylinder block below the timing cavity; A cylinder head, the cylinder head is connected to the cylinder block and jointly defines an oil return cavity, the oil return cavity is communicated with the timing cavity, an oil return hole is formed on 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 surrounding the oil return hole is formed at the bottom of the oil return cavity, an oil return cavity oil weir protruding upward is provided on the oil return cavity bottom surface, and the oil liquid on the inner side wall of the oil return cavity is adapted to flow to the oil return hole after being shunted by the oil return cavity oil weir.

2. The engine according to claim 1, characterized in that, First oil drain grooves and second oil drain grooves are further formed on both sides of the oil return cavity oil weir at the bottom of the oil return cavity, and the oil liquid in the oil return cavity is adapted to flow to the oil return hole through the first oil drain groove, the oil return cavity oil weir and the second oil drain groove respectively.

3. The engine according to claim 2, characterized in that, The oil return cavity oil weir includes an oil return cavity oil weir front side surface, an oil return cavity oil weir arc surface and an oil return cavity oil weir rear side surface. The oil return cavity oil weir front side surface is formed on one side of the oil return cavity oil weir facing the first oil drain groove and is connected to the inner wall of the first oil drain groove. The oil return cavity oil weir rear side surface is formed on one side of the oil return cavity oil weir facing the second oil drain groove and is connected to the inner wall of the second oil drain groove. The oil return cavity oil weir arc surface is formed on one side of the oil return cavity oil weir facing the oil return hole.

4. The engine according to claim 3, characterized in that, At least part of the side wall surface of the oil return cavity 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; Wherein, the outer drainage wall includes a connected first drainage front arc surface and a first drainage rear arc surface. The first drainage front arc surface extends to be connected to the first oil drain groove and is adapted to direct flow towards the first oil drain groove. The first drainage rear arc surface extends to be connected to the second oil drain groove and is adapted to direct flow towards the second oil drain groove.

5. The engine according to claim 3, characterized in that, The top surface of the oil return cavity oil weir is configured as a drainage plane, and the oil return cavity oil weir front side surface, the oil return cavity oil weir arc surface and the oil return cavity oil weir rear side surface respectively intersect with the drainage plane.

6. The engine according to claim 1, characterized in that, The oil return cavity oil weir is located on the oil return cavity bottom surface on the side of the oil return hole away from the cylinder block.

7. The engine according to any one of claims 1-6, 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, wherein An installation hole communicated 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 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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