Engine assembly

Abstract

The invention belongs to the technical field of engines, and particularly relates to an engine assembly. The engine assembly comprises an air cylinder assembly and a water pump, the air cylinder assembly comprises an engine body, a cylinder sleeve and a cylinder cover, a mounting cavity is formed in the engine body, the cylinder sleeve is arranged in the mounting cavity, a first cooling flow channel is formed between the outer wall of the cylinder sleeve and the cavity wall of the mounting cavity, and the first cooling flow channel communicates with a water outlet channel; the water outlet passage is provided with a water distribution port and a water outlet, the water distribution port is communicated with the water pump, a second cooling flow channel is arranged in the cylinder cover, the water outlet is communicated with the second cooling flow channel, and the second cooling flow channel is communicated with the water pump. According to the engine assembly in the technical scheme, the cooling effect of the cylinder sleeve is improved, the problems of deformation, abrasion, abnormal vibration and the like of the cylinder sleeve due to the poor cooling effect are effectively solved, the overall performance of the engine assembly is improved, and the service life of the engine assembly is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of engines, and in particular relates to an engine assembly. Background Art

[0002] During the operation of the engine, the temperature of the gas in the cylinder often reaches a high temperature of several hundred degrees Celsius. If this heat cannot be dissipated in time, the various components of the engine will be damaged due to overheating. Especially those components that are in direct contact with the hot gas will expand under the action of high temperature, resulting in changes in the fit clearance. This change may have an adverse effect on the normal operation of the engine and may even cause engine performance degradation or failure. In order to cope with this problem, the engine's liquid cooling system plays a vital role in the structural design of the engine. The liquid cooling system increases the pressure of the cooling water through the action of the water pump, so that the cooling water can be forced to circulate inside the engine. This circulating cooling water can effectively take away the heat generated by the engine during operation, thereby helping the engine to operate within an appropriate temperature range. In this way, the liquid cooling system ensures that the temperature of various engine components is maintained at a safe level, avoiding thermal expansion and other related problems caused by overheating, thereby ensuring the stable operation of the engine and extending its service life.

[0003] During the operation of the engine, the connecting rod drives the piston and the piston ring on it to move up and down. During this process, the outer surface of the piston ring will continuously rub against the inner surface of the cylinder liner, thereby continuously generating heat. At the same time, the high-temperature gas generated by the engine during the exhaust stroke is discharged from the body through the exhaust duct in the cylinder head, and the injector installed inside the cylinder head is also working continuously. Therefore, in order to ensure the normal operation of the engine, both the cylinder liner and the cylinder head need to be cooled by an external medium. In the traditional engine structure design, after the cooling water exchanges heat with the cylinder liner, it will flow into the cylinder head, then pass through the thermostat and radiator in turn, and finally return to the water pump. However, due to the large pressure drop of the entire system, the amount of cooling water at the top of the cylinder liner is relatively low, and the cooling effect is not ideal. This situation easily causes the top of the cylinder liner to overheat and then deform. Once the top of the cylinder liner is deformed, it will cause a series of problems, such as severe wear of the cylinder liner, cavitation of the cylinder liner surface caused by abnormal vibration, and aging of the sealing ring.

[0004] In the existing engine structure, if you want to increase the flow of cooling water around the cylinder liner, you can usually only do so by increasing the head or power of the water pump. However, the effect of this method is often limited.

[0005] Therefore, in order to improve the cooling effect of the engine, it is necessary to improve the existing cooling system to ensure that the cylinder liner and the cylinder head can be fully and evenly cooled, thereby avoiding various problems caused by overheating. The present invention provides an engine assembly that can improve the cooling effect to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to at least solve the problem of poor cooling effect of the cylinder assembly. This purpose is achieved by the following technical solutions:

[0007] A first aspect of the present invention provides an engine assembly, comprising:

[0008] A cylinder assembly and a water pump, the cylinder assembly comprising a body, a cylinder liner and a cylinder head, the body being provided with an installation cavity inside, the cylinder liner being provided inside the installation cavity, a first cooling channel being formed between an outer wall of the cylinder liner and a cavity wall of the installation cavity, the first cooling channel being connected with a water outlet passage, the water outlet passage having a water diversion port and a water outlet, the water diversion port being connected with a water pump, the cylinder head being provided with a second cooling channel inside, the water outlet being connected with the second cooling channel, the second cooling channel being connected with the water pump.

[0009] By setting a first cooling channel on the outer wall of the cylinder liner, the cylinder liner can be in direct contact with the cooling water and effectively exchange heat. Subsequently, the cooling water after heat exchange flows to the water outlet and the water outlet through the water outlet passage. The cooling water flowing out of the water outlet will flow back to the water pump, and the cooling water flowing out of the water outlet will enter the second cooling channel inside the cylinder head. Inside the cylinder head, the cooling water continues to exchange heat with the cylinder head, absorbs the heat of the cylinder head, and then flows out from the second cooling channel and finally returns to the water pump to complete the entire cooling cycle. With this structural setting, not only can the cylinder liner be fully heat exchanged with the cooling water, but the cylinder head can also be effectively cooled. In this way, the temperature of the cylinder liner and the cylinder head are effectively controlled, avoiding deformation, wear and abnormal vibration caused by excessive temperature. In addition, by adding a water outlet, the flow rate of cooling water is significantly increased compared with the existing cylinder assembly, thereby further improving the cooling effect of the cylinder liner and effectively alleviating the problems of cylinder liner deformation, wear and abnormal vibration caused by poor cooling effect. Through this improvement, not only the overall performance of the engine assembly is improved, but also the service life of the engine assembly is effectively extended, ensuring the stable operation of the engine assembly under various working conditions.

[0010] In addition, the engine assembly of the present invention may also have the following additional technical features:

[0011] In some embodiments of the present invention, the engine assembly further includes an engine accessory, the water diversion port is in communication with the engine accessory, and the engine accessory is in communication with the water pump.

[0012] In some embodiments of the present invention, a reinforcement portion is provided on the outer side of the water outlet passage.

[0013] In some embodiments of the present invention, a first supporting shoulder is provided at the top of the cylinder liner, and a second supporting shoulder is provided at the top of the water outlet passage, the first supporting shoulder and the second supporting shoulder are abutted against each other, and a height H from the second supporting shoulder to the bottom of the reinforcement portion is greater than the sum of a height X from the second supporting shoulder to the top of the water outlet passage and a height Y of the water outlet passage.

[0014] In some embodiments of the present invention, a plurality of cylinder sleeves are arranged in the machine body, and the outer wall of each of the cylinder sleeves and the cavity wall of the installation cavity respectively form the first cooling channel, and each of the first cooling channels is respectively connected to a water outlet passage, and a plurality of the water outlet passages all have the water outlet, and at least one of the water outlet passages has the water diversion port.

[0015] In some embodiments of the present invention, adjacent first cooling channels are connected via a connecting channel.

[0016] In some embodiments of the present invention, the connecting channel is located between two adjacent cylinder sleeves, the flow direction of cooling water in the connecting channel is inclined toward the water outlet channel, and the angle between the axial direction of the connecting channel and the front end surface of the cylinder assembly is a first angle a1:

[0017] 30°≤a1<90°.

[0018] In some embodiments of the present invention, a water inlet main pipe is provided inside the machine body, a water inlet passage is provided between the water inlet main pipe and the first cooling channel, and the first cooling channel is connected to the water inlet main pipe through the water inlet passage.

[0019] In some embodiments of the present invention, the axial direction of the water outlet passage and the axial direction of the water inlet passage are located on the same maximum outer diameter of the cylinder sleeve;

[0020] The angle between the axial direction of the water outlet passage and the front end surface of the cylinder assembly is a second angle a2, and the angle between the axial direction of the water inlet passage and the front end surface of the cylinder assembly is a third angle a3:

[0021] a2=a3, and 25°≤a2≤75°.

[0022] In some embodiments of the present invention, the cylinder assembly includes a water outlet main pipe, the second cooling channel is connected to the water outlet main pipe, and the water outlet main pipe is used to communicate with a thermostat. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 Schematically shows a partial cross-sectional schematic diagram of an engine assembly according to an embodiment of the present invention;

[0025] Figure 2 Schematically shows Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 The schematic diagram schematically shows the flow direction of cooling water in an engine assembly according to an embodiment of the present invention;

[0027] Figure 4 Schematically shows the convection heat transfer coefficient of each cylinder according to the prior art implementation;

[0028] Figure 5 Schematically showing the convection heat transfer coefficient of each cylinder according to an embodiment of the present invention;

[0029] Figure 6 A partial structural diagram of an engine assembly according to an embodiment of the present invention is schematically shown;

[0030] Figure 7 Schematically shows an embodiment of the present invention Figure 6 Schematic diagram of the cross section of AA;

[0031] Figure 8 Schematically shows an embodiment of the present invention Figure 6 Schematic diagram of the cross section of BB.

[0032] The reference numerals in the accompanying drawings represent the following:

[0033] 100, engine body; 110, water inlet main pipe; 120, reinforcement portion; 121, second supporting shoulder; 200, cylinder liner; 210, first cooling channel; 220, water outlet passage; 221, water diversion port; 222, water outlet; 230, connecting passage; 240, water inlet passage; 250, first supporting shoulder; 300, cylinder head; 310, second cooling channel; 320, water outlet main pipe; 10, front end; 20, rear end. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0036] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0037] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0038] Figure 1 A partial cross-sectional view of an engine assembly according to an embodiment of the present invention is schematically shown. Figure 2 Schematically shows Figure 1 A partial enlarged view of the middle A. Figure 1 and Figure 2 As shown, the present invention proposes an engine assembly, which includes a cylinder assembly and a water pump. The cylinder assembly includes a body 100, a cylinder liner 200 and a cylinder head 300. The body 100 is provided with an installation cavity inside, and the cylinder liner 200 is arranged inside the installation cavity. A first cooling channel 210 is formed between the outer wall of the cylinder liner 200 and the cavity wall of the installation cavity. The first cooling channel 210 is connected to a water outlet passage 220. The water outlet passage 220 has a water diversion port 221 and a water outlet 222. The water diversion port 221 is connected to the water pump. A second cooling channel 310 is provided inside the cylinder head 300. The water outlet 222 is connected to the second cooling channel 310, and the second cooling channel 310 is connected to the water pump.

[0039] By setting the first cooling channel 210 on the outer wall of the cylinder liner 200, the cylinder liner 200 can be in direct contact with the cooling water and effectively exchange heat. Subsequently, the cooling water after heat exchange flows to the water outlet 221 and the water outlet 222 through the water outlet passage 220. The cooling water flowing out of the water outlet 221 will flow back to the water pump, and the cooling water flowing out of the water outlet 222 will enter the second cooling channel 310 inside the cylinder head 300. Inside the cylinder head 300, the cooling water continues to exchange heat with the cylinder head 300, absorbs the heat of the cylinder head 300, and then flows out from the second cooling channel 310, and finally returns to the water pump to complete the entire cooling cycle. With this structural setting, not only can the cylinder liner 200 be fully heat exchanged with the cooling water, but the cylinder head 300 can also be effectively cooled. In this way, the temperature of the cylinder liner 200 and the cylinder head 300 are effectively controlled, avoiding problems such as deformation, wear and abnormal vibration caused by excessive temperature. In addition, by adding the water diversion port 221, the flow rate of cooling water is significantly increased compared with the existing cylinder assembly, thereby further improving the cooling effect of the cylinder liner 200, and effectively alleviating the deformation, wear and abnormal vibration of the cylinder liner 200 caused by poor cooling effect. Through this improvement, not only the overall performance of the engine assembly is improved, but also the service life of the engine assembly is effectively extended, ensuring the stable operation of the engine assembly under various working conditions.

[0040] Furthermore, the water outlet passage 220 is arranged at the top position of the cylinder liner 200. During the process of the piston doing work, the closer the cylinder liner 200 is to the combustion chamber, the higher the heat load it bears. Therefore, the cooling of the top of the cylinder liner 200 is particularly critical and important. According to the specific layout and design of the cooling water flow channel, the cooling capacity obtained by the cylinder liner 200 at different positions will also be different. Setting the water outlet passage 220 at the top position of the cylinder liner 200 can effectively increase the cooling water flow in the top area. In this way, the cooling effect of the top will be significantly improved, thereby better protecting the top of the cylinder liner 200 from damage by high temperature and ensuring the stable operation of the engine assembly.

[0041] Furthermore, the engine assembly also includes engine accessories, the water diversion port 221 is connected to the engine accessories, and the engine accessories are connected to the water pump.

[0042] The engine accessories take water from the water diversion port 221, and this part of the cooling water returns directly to the water pump after passing through the engine accessories. This design has a significant pressure drop advantage compared to the traditional cooling water circulation circuit. Due to the small pressure drop, the cooling water flow outside the cylinder liner 200 is increased, thereby improving the cooling efficiency. At the same time, since water is taken at the top of the cylinder liner 200, the cooling water flow rate at the top of the cylinder liner 200 can be increased, which improves the cooling effect at the top of the cylinder liner 200 and solves the problems of large deformation of the cylinder liner 200, aging of the sealing ring, and high temperature at the piston ring position caused by poor cooling effect at the top of the cylinder liner 200. Therefore, the engine assembly in this embodiment has good working performance and long service life, and can operate stably under various working conditions. Under this setting mode, the water diversion port 221 is used as the water intake position of the engine accessories. By setting the water intake position of the engine accessories at the water diversion port 221, the characteristics of the engine accessories requiring cooling water are fully utilized, and the heat exchange capacity of the cylinder liner 200 is effectively improved.

[0043] Exemplarily, the engine accessories may include an air compressor cooler. During the operation of the air compressor, the compressor pressurizes the air and stores it in the tank for use, which generates a large pressure and generates more heat energy. If the temperature cannot be reduced in time, it may cause overheating, thereby causing risks. Therefore, the air compressor cooler is used to cool down to ensure that the air compressor can better maintain a continuous working state. Water cooling is a commonly used cooling method for air compressors. For another example, the engine accessories may also include a urea nozzle. The urea nozzle is used to spray urea aqueous solution, which is usually used with selective catalytic reduction technology and is mainly used to reduce nitrogen oxides in diesel vehicle emissions. By spraying urea aqueous solution into the exhaust airflow for catalytic reduction reaction, the pollution of exhaust gas to the environment is reduced. The engine accessories may also include a supercharger cooler. The turbocharger is located in the exhaust system of the engine assembly and is directly exposed to the high-temperature exhaust gas. Its operating temperature is very high, at least above 400°C. Due to the high temperature of the exhaust gas and the high temperature generated by the high-speed rotation of the turbine, the turbocharger can easily reach 600°C or even higher. In extreme cases, the temperature may reach 1000°C or higher. Such a high temperature environment places extremely high demands on the material and structure of the turbocharger, and also requires effective cooling measures to ensure its normal operation. Water cooling is a commonly used cooling method for existing turbochargers. It can be understood that the engine accessories referred to in this embodiment are not limited to air compressor coolers, urea nozzles and supercharger coolers. The water diversion port 221 can be used as a water intake port for one or more engine accessories, and of course, it can also be used as a water intake port for vehicle accessories, and is specifically set according to actual needs.

[0044] Further, see Figure 2 A reinforcement portion 120 is provided on the outer side of the water outlet passage 220 .

[0045] By adding a water diversion port 221, the convective heat transfer coefficient between the cylinder liner 200 and the cooling water is significantly improved, thereby effectively improving the cooling performance of the cylinder liner 200. However, due to the addition of the water diversion port 221 on the water outlet passage 220, the opening in the body 100 is increased, resulting in a relatively weak structural strength at this location. In order to address this problem, by providing a reinforcement portion 120 at the corresponding position, the loss of local strength of the body 100 caused by the opening of the body 100 can be compensated to a large extent. In this way, not only the structural strength and rigidity here are improved, but also the vibration amplitude of the cylinder liner 200 here is reduced, thereby effectively reducing the risk of cavitation of the cylinder liner 200 here. Through this design optimization, it can be ensured that the engine assembly maintains good performance and reliability during long-term operation.

[0046] Furthermore, a first supporting shoulder 250 is provided at the top of the cylinder liner 200, and a second supporting shoulder 121 is provided at the top of the water outlet passage 220. The first supporting shoulder 250 and the second supporting shoulder 121 are abutted against each other, and a height H from the second supporting shoulder 121 to the bottom of the reinforcement portion 120 is greater than the sum of a height X from the second supporting shoulder 121 to the top of the water outlet passage 220 and a height Y of the water outlet passage 220.

[0047] Optionally, the first support shoulder 250 is located at the top of the cylinder liner 200, forming a transition fit with the engine body 100, thereby playing a positioning and sealing role. This arrangement ensures the correct position of the cylinder liner 200 in the engine body 100, prevents it from moving or offsetting, and also helps prevent leakage of engine oil or other liquids. During the operation of the cylinder assembly, the support shoulder is also subjected to a certain amount of pressure and heat, so its material and design must be able to withstand these extreme conditions. For example, in some cases, if the support shoulder breaks, it will cause the cylinder liner 200 to lose its position, and then cause the cylinder liner 200 to jump into the crankcase as a whole, and be broken by the rotating crankshaft and connecting rod, causing serious damage to the cylinder assembly.

[0048] It is understandable that when the height X from the second support shoulder 121 to the top of the water outlet passage 220 increases, the strength of the structure will increase accordingly. However, during the design process, it must be taken into account that the water outlet passage 220 needs to have sufficient flow area to ensure smooth water flow. At the same time, the position of the water outlet passage 220 must also be in the best state to ensure good heat dissipation performance. Therefore, during the design, it is necessary to comprehensively consider the height of the second support shoulder 121 and the height of the water outlet passage 220 to achieve the best balance. In the preferred design scheme, by calculating the surface pressure and strength at the support shoulder of the cylinder liner 200, it can be determined that the contact surface of the first support shoulder 250 and the second support shoulder 121 should be higher than the position of the first piston ring (i.e., the ring closest to the combustion chamber). This design method can better adapt to the wear that may occur between the cylinder liner 200 and the piston ring during long-term use, thereby causing the gap change. In this way, the sealing effect can be significantly enhanced to ensure the stability of the structure during operation. In addition, in order to ensure that the support shoulder has sufficient structural strength, the width of the support shoulder should be greater than 2mm. Such a design can ensure that the cooling medium flows evenly at the support shoulder, avoid throttling or interruption due to wear of the support shoulder, and thus improve the heat exchange capacity at the top of the cylinder liner 200. For the size design of the reinforcement part 120, it is required that the height H from the second support shoulder 121 to the bottom of the reinforcement part 120 is greater than the sum of the height X from the second support shoulder 121 to the top of the water outlet passage 220 and the height Y of the water outlet passage 220. Such a setting method can effectively strengthen the local weak position of the body 100, thereby improving the stability and reliability of the overall structure.

[0049] When designing the water outlet passage 220, it is possible to consider setting the height Y of the water outlet passage 220 to be greater than 1 / 3 of the piston stroke. Such a design can ensure that the cooling water has enough space when passing through the water outlet passage 220, thereby reducing the water flow resistance, improving the efficiency of the pump, and enhancing the cooling effect around the piston. In addition, the top plate thickness Z at the top of the water outlet passage 220 is also an important design parameter. According to actual application requirements, the top plate thickness Z can be set between 8mm and 15mm to ensure the strength and stability of the structure. Exemplarily, the top plate thickness Z can be 8mm, 10mm, 12mm, 14mm or 15mm, etc. In order to further optimize the design of the water outlet passage 220, the size of the diameter φ of the water diversion port 221 needs to be determined by computational fluid dynamics (CFD) simulation. CFD simulation is a numerical simulation method that analyzes and predicts fluid flow phenomena by numerically solving flow control equations by computers. Through CFD simulation, the optimal water diversion port 221 diameter φ can be accurately calculated to ensure that the cooling water flow rate is effectively improved.

[0050] Furthermore, the cylinder assembly provided in this embodiment can be applied to a single-cylinder engine or a multi-cylinder engine. Figure 3 The schematic diagram of the flow direction of cooling water in the cylinder assembly according to the embodiment of the present invention is schematically shown. Figure 3 A plurality of cylinder sleeves 200 are arranged in the machine body 100, and the outer wall of each cylinder sleeve 200 forms a first cooling channel 210 with the cavity wall of the installation cavity. Each first cooling channel 210 is connected to a water outlet passage 220, and the plurality of water outlet passages 220 have a water outlet 222, and at least one water outlet passage 220 has a water outlet 221.

[0051] In the design and layout of a multi-cylinder engine, the water pump is usually placed at the front end 10 of the cylinder assembly, taking into account the installation and layout requirements of the engine assembly on the vehicle. Specifically, when the cylinder assembly is installed on the vehicle and the driver faces forward, the water pump will be placed at the front end 10 of the cylinder assembly, that is, the fan end. This design is to meet the cooling requirements of each cylinder of the cylinder assembly during operation. The cooling water starts from the water pump and passes through the cooling system inside the engine assembly, and is distributed to each cylinder block from front to back in sequence to ensure that each cylinder block can be effectively cooled. Similarly, the return water generated by the engine assembly during operation, that is, the cooling water that has absorbed heat, will also follow the opposite path from the front end 10 and return to the water pump before the rear end 20.

[0052] During the operation of the engine assembly, due to certain differences in the cooling water distribution paths of each cylinder, this difference will lead to different flow resistances on the cooling water distribution paths of each cylinder. Taking a six-cylinder engine as an example, the front end 10 of the cylinder assembly is defined as the first cylinder, and then the second cylinder, the third cylinder, the fourth cylinder, the fifth cylinder and the sixth cylinder are arranged backward in sequence. Through such analysis, we can draw a conclusion: the cooling water delivery path of the first cylinder is the shortest, so its flow resistance is also the smallest, which means that the cooling water flow allocated to the first cylinder is the largest. On the contrary, the cooling water delivery path of the sixth cylinder is the longest, so its flow resistance is the largest, the cooling water flow allocated to the sixth cylinder is the smallest, and the heat transfer coefficient is also the smallest, which will affect the timely dissipation of heat from the cylinder liner 200.

[0053] Since the heat exchange capacity of each cylinder is different, this will lead to differences in the performance of each cylinder or the service life of related components. For example, in the process of installing the cylinder liner 200 on the engine body 100, a sealing ring is required to seal the cooling water between the engine body 100 and the cylinder liner 200. However, since the heat exchange capacity of each cylinder is different, this will lead to differences in the service life of the sealing rings of each cylinder. In addition, in a multi-cylinder engine, the bolt pressure on the last cylinder cylinder head 300 is usually large, which makes the support shoulder of the last cylinder liner 200 bear a large force. If the heat dissipation capacity is poor, it will further aggravate the damage to the support shoulder, thereby affecting the overall performance and life of the cylinder assembly.

[0054] When the cylinder assembly is provided with a plurality of cylinders, the water outlet 221 may be provided on a certain body 100, or the water outlets 221 may be provided on a plurality of bodies 100. Figure 3 The sixth cylinder is the end position of the entire water path and is the position with the highest flow resistance. A water outlet 221 may be provided on the body 100 of the sixth cylinder. Figure 4 The convective heat transfer coefficient of each cylinder according to the embodiment of the prior art is schematically shown. Figure 5 The convective heat transfer coefficient of each cylinder according to an embodiment of the present invention is schematically shown. Figure 4 and Figure 5It can be clearly seen that after the water diversion port 221 is set on the body 100 of the sixth cylinder, the heat transfer coefficient of the sixth cylinder has been significantly improved. In addition, the heat transfer coefficients of other cylinders have also been improved to varying degrees. It can be seen that the setting of the water diversion port 221 can not only effectively increase the flow rate of cooling water, but also serve as a regulator for the distribution of cooling water flow in a multi-cylinder engine, thereby improving the cooling efficiency of the entire system. Of course, the setting of the water diversion port 221 is not limited to only the sixth cylinder, it can also be distributed in other cylinders. The specific location selection can be determined based on the computational fluid dynamics simulation results. By performing detailed simulation calculations, it can be ensured that the dispersion of the cooling water flow of each cylinder is minimized, thereby improving the uniformity of cooling of each cylinder. Such optimization measures can greatly avoid common problems in six-cylinder engines, such as support shoulder wear and thermal aging of the cylinder liner 200 sealing ring.

[0055] Further, Figure 6 A partial structural diagram of a cylinder assembly according to an embodiment of the present invention is schematically shown. Figure 7 Schematically shows an embodiment of the present invention Figure 6 Schematic diagram of the cross section at A. Figure 6 and Figure 7 , adjacent first cooling channels 210 are connected through a connecting channel 230 .

[0056] By providing a connecting channel 230 between adjacent first cooling channels 210, the cooling water can flow directly from the outside of one cylinder liner 200 to the outside of an adjacent cylinder liner 200, thereby effectively improving the flow rate and flow velocity of the cooling water. At the same time, the heat exchange uniformity of each cylinder can be uniformed, the consistency of the sealing ring life of each cylinder can be ensured, and cavitation failures caused by sudden changes in the cooling water flow velocity can be avoided.

[0057] Furthermore, the connecting channel 230 is located between two adjacent cylinder sleeves 200, the flow direction of the cooling water in the connecting channel 230 is inclined toward the water outlet passage 220, and the angle between the axial direction of the connecting channel 230 and the front end surface of the cylinder assembly is a first angle a1: 30°≤a1<90°.

[0058] It is understandable that the flow direction of the cooling water in the connecting channel 230 is designed to be inclined toward the direction of the water outlet passage 220. Such a design is intended to form a tangential force that promotes the flow of cooling water, thereby promoting the flow of cooling water toward the direction of the water outlet passage 220. In this way, the flow rate and flow velocity of the cooling water can be effectively improved, thereby enhancing the cooling effect. In practical applications, the first angle a1 can be set to different values ​​such as 30°, 45°, 60° or 75°, depending on actual needs and design parameters. In order to determine the optimal value of the first angle a1, a computational fluid dynamics simulation calculation method can be used. Through CFD simulation, the flow of cooling water in the connecting channel 230, including the uniformity and piezoresistance distribution of cooling water, can be analyzed in detail. By comprehensively considering the uniformity and piezoresistance cloud map of cooling water, a suitable value of the first angle a1 is selected.

[0059] Further, Figure 8 Schematically shows an embodiment of the present invention Figure 6 Schematic diagram of the cross section at B. Figure 6 and Figure 8 A water inlet main pipe 110 is disposed inside the machine body 100 , a water inlet passage 240 is disposed between the water inlet main pipe 110 and the first cooling flow channel 210 , and the first cooling flow channel 210 is connected to the water inlet main pipe 110 through the water inlet passage 240 .

[0060] When the cylinder assembly includes multiple cylinders, the cooling water first starts from the water inlet manifold 110 and then flows to the multiple water inlet passages 240. These water inlet passages 240 distribute the cooling water to the first cooling channel 210 outside each cylinder liner 200. In this way, the cooling water can fully exchange heat with the outer wall of the cylinder liner 200 in the first cooling channel 210, thereby effectively reducing the temperature of the cylinder.

[0061] Furthermore, the axial direction of the water outlet passage 220 and the axial direction of the water inlet passage 240 are located on the same maximum outer diameter of the cylinder liner 200; the angle between the axial direction of the water outlet passage 220 and the front end face of the cylinder assembly is a second angle a2, and the angle between the axial direction of the water inlet passage 240 and the front end face of the cylinder assembly is a third angle a3: a2=a3, and 25°≤a2≤75°.

[0062] By ensuring that the axial direction of the water outlet passage 220 and the axial direction of the water inlet passage 240 are located on the same maximum outer diameter of the cylinder liner 200, it can be effectively ensured that the flow distance of the cooling water on both sides of the cylinder liner 200 remains consistent. This design helps to achieve uniformity of cooling water flow and minimizes the flow resistance of cooling water at the intersection of the first cooling channel 210 and the water inlet and outlet channels. According to the analysis of the force direction of the piston, the water outlet passage 220 and the water inlet passage 240 are generally required to avoid the main force area of ​​the piston, that is, the force area on the main thrust side and the auxiliary thrust side ( Figure 8 The left and right sides of the cylinder sleeve 200). For example, the second angle a2 (the third angle a3) may be 25°, 35°, 45°, 55°, 65° or 75°, etc.

[0063] Furthermore, the engine assembly includes a water outlet main pipe 320, the second cooling flow channel 310 is connected to the water outlet main pipe 320, and the water outlet main pipe 320 is used to communicate with the thermostat.

[0064] When designing the cylinder assembly, the position of the water outlet manifold 320 can be flexibly set according to specific needs. Specifically, the water outlet manifold 320 can be placed inside the cylinder head 300, or it can be placed outside the cylinder head 300. When the cylinder assembly includes multiple cylinders, multiple cylinder sleeves 200 can share one cylinder head 300, or each cylinder sleeve 200 can be connected to an independent cylinder head 300. When multiple cylinder sleeves 200 share one cylinder head 300, the water outlet manifold 320 can be set inside the cylinder head 300, which can simplify the structure and reduce the complexity of the external pipeline. On the contrary, when each cylinder sleeve 200 is connected to an independent cylinder head 300, the water outlet manifold 320 can be set outside the cylinder head 300, which can ensure the sealing of the water outlet manifold 320 and make the maintenance and overhaul of the cooling system more convenient.

[0065] During the operation of the cooling system, after the cooling water flows out of the water outlet main pipe 320, it will first flow to the thermostat. The function of the thermostat is to adjust the flow direction of the cooling water according to the temperature of the cooling water. According to the adjustment of the thermostat, part of the cooling water will flow to the radiator for heat dissipation. In the radiator, the heat in the cooling water is dissipated through the contact between the outer wall of the radiator and the air. After the cooling treatment of the radiator, the temperature of the cooling water is reduced, and then it returns to the water pump through the radiator outlet pipe. This circulation process allows the cooling water to circulate continuously inside the engine assembly, thereby effectively reducing the temperature of the cylinder assembly and ensuring that the cylinder assembly operates in the best working condition.

[0066] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An engine assembly, characterized in that: The invention comprises a cylinder assembly and a water pump, wherein the cylinder assembly comprises a machine body (100), a cylinder sleeve (200) and a cylinder head (300); an installation cavity is arranged inside the machine body (100); the cylinder sleeve (200) is arranged inside the installation cavity; a first cooling channel (210) is formed between the outer wall of the cylinder sleeve (200) and the cavity wall of the installation cavity; the first cooling channel (210) is connected to a water outlet passage (220); the water outlet passage (220) has a water diversion port (221) and a water outlet (222); the water diversion port (221) is connected to the water pump; a second cooling channel (310) is arranged inside the cylinder head (300); the water outlet (222) is connected to the second cooling channel (310); the second cooling channel (310) is connected to the water pump.

2. The engine assembly according to claim 1, characterized in that: The engine assembly also includes an engine accessory, the water diversion port (221) is in communication with the engine accessory, and the engine accessory is in communication with the water pump.

3. The engine assembly according to claim 1, characterized in that: A reinforcement portion (120) is provided on the outer side of the water outlet passage (220).

4. The engine assembly according to claim 3, characterized in that: A first supporting shoulder (250) is provided at the top of the cylinder sleeve (200), and a second supporting shoulder (121) is provided at the top of the water outlet passage (220); the first supporting shoulder (250) and the second supporting shoulder (121) are in abutment with each other, and a height H from the second supporting shoulder (121) to the bottom of the reinforcement portion (120) is greater than the sum of a height X from the second supporting shoulder (121) to the top of the water outlet passage (220) and a height Y of the water outlet passage (220).

5. The engine assembly according to claim 1, characterized in that: A plurality of cylinder sleeves (200) are arranged in the machine body (100), the outer wall of each cylinder sleeve (200) and the cavity wall of the installation cavity respectively form the first cooling channel (210), each first cooling channel (210) is respectively connected to a water outlet passage (220), a plurality of the water outlet passages (220) all have the water outlet (222), and at least one of the water outlet passages (220) has the water outlet (221).

6. The engine assembly according to claim 5, characterized in that: Adjacent first cooling channels (210) are connected via a connecting channel (230).

7. The engine assembly according to claim 6, characterized in that: The communication channel (230) is located between two adjacent cylinder sleeves (200), the flow direction of cooling water in the communication channel (230) is inclined toward the water outlet passage (220), and the angle between the axial direction of the communication channel (230) and the front end surface of the cylinder assembly is a first angle a1: 30°≤a1＜90°。 8. The engine assembly according to claim 1, characterized in that: A water inlet main pipe (110) is arranged inside the machine body (100), a water inlet passage (240) is arranged between the water inlet main pipe (110) and the first cooling flow channel (210), and the first cooling flow channel (210) is connected to the water inlet main pipe (110) through the water inlet passage (240).

9. The engine assembly according to claim 8, characterized in that: The axial direction of the water outlet passage (220) and the axial direction of the water inlet passage (240) are located on the same maximum outer diameter of the cylinder sleeve (200); The angle between the axial direction of the water outlet passage (220) and the front end surface of the cylinder assembly is a second angle a2, and the angle between the axial direction of the water inlet passage (240) and the front end surface of the cylinder assembly is a third angle a3: a2=a3, and 25°≤a2≤75°.

10. The engine assembly according to any one of claims 1 to 9, characterized in that: The engine assembly comprises a water outlet main pipe (320), the second cooling channel (310) is connected to the water outlet main pipe (320), and the water outlet main pipe (320) is used to communicate with a thermostat.

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