Piston cooling device and internal combustion engine

Abstract

The present application relates to a piston cooling device and an internal combustion engine, belonging to the technical field of piston cooling. The piston cooling device comprises a nozzle, an oil injection pipeline, the oil injection pipeline is connected with the nozzle, the oil injection pipeline is used to allow lubricating oil to cool the outside of the piston, and an oil cylinder, one end of the oil cylinder is connected with the oil injection pipeline, and the other end is used to communicate with the piston to cool the inside of the piston. The present application can inject cooling lubricating oil through the nozzle, cool the bottom of the piston through the oil injection pipeline, inject the cooling lubricating oil into the cooling oil channel in the piston through the plunger in the cylinder body, and cool the inside of the piston, so that both the inside and the outside of the piston can be cooled, thereby improving the cooling efficiency of the piston, avoiding insufficient cooling efficiency of the piston, resulting in reduced working efficiency and life of the piston, and avoiding the piston being deformed due to high temperature due to increasing heat load on the piston, thereby increasing the gap between the piston and the cylinder wall of the internal combustion engine cylinder.

Description

Technical Field

[0001] The present application relates to the technical field of piston cooling, and in particular to a piston cooling device and an internal combustion engine. Background Art

[0002] The engine is a thermodynamic cycle system, which is the process of converting fuel combustion energy into mechanical energy. The piston is one of the important components of the engine and plays a key role in the engine. The working principle of the piston in the engine is as follows:

[0003] First, the oil-gas mixture entering the engine is ignited by the spark plug, and after combustion, high-temperature and high-pressure gas is produced; then, these gases push the piston downward, driving the connecting rod and crankshaft to rotate; finally, driven by the crankshaft, the wheels begin to rotate. It can be seen that the piston plays a vital role in the engine. However, due to long-term operation at high temperature and high pressure, the piston is easily thermally deformed, thus affecting the engine performance. In order for it to operate normally, it needs to be cooled.

[0004] There are many ways to cool the piston, such as liquid cooling and air cooling. Liquid cooling uses coolant to cool the piston, and transfers the heat in the engine to the radiator through a circulation system, and dissipates the heat through air flow. This method is also called a liquid cooling system.

[0005] Air cooling uses external air to cool the piston and dissipates heat through the heat sink on the surface of the piston. This method is also called an air-cooled heat dissipation system.

[0006] The existing piston structure is a hollow cylinder with an open end. As the power of the internal combustion engine continues to increase, the heat load of the whole machine is also increasing, and the cooling of the piston is essential. The piston is currently cooled by liquid cooling, mainly by spraying cooling lubricating oil on the piston through a piston cooling nozzle. The piston cooling nozzle is installed on the cylinder block of the internal combustion engine. An oil injection pipe is connected to the piston nozzle. The oil injection pipe extends into the piston through one end of the piston opening, and then lubricating oil is sprayed on the bottom of the piston through the piston nozzle for cooling.

[0007] However, due to the continuous increase in power, the heat load on the piston is getting bigger and bigger. In order to improve fuel economy and reduce the power consumption of accessories, many internal combustion engines use low-viscosity oil, which also reduces the oil pressure. The current piston cooling needs to be further strengthened. Summary of the invention

[0008] The embodiments of the present application provide a piston cooling device and an internal combustion engine to solve the problem that the power of the existing internal combustion engine in the related art is continuously increased, resulting in insufficient cooling efficiency of the piston by the piston cooling device.

[0009] A first aspect of an embodiment of the present application provides a piston cooling device, comprising:

[0010] nozzle;

[0011] An oil injection pipeline, the oil injection pipeline is in communication with the nozzle, and the oil injection pipeline is used to allow the lubricating oil to pass through the outside of the piston for cooling;

[0012] An oil cylinder, one end of which is connected to the oil injection pipeline, and the other end of which is used to be connected to the piston to cool the inside of the piston.

[0013] In some embodiments, the oil cylinder includes a cylinder body, a plunger disposed in the cylinder body, and a one-way valve disposed in the cylinder body.

[0014] In some embodiments, the cylinder body is a hollow structure with openings at both ends, and one end of the cylinder body close to the oil injection pipeline is connected to the oil injection pipeline through the opening;

[0015] The one-way valve is arranged on an opening of the cylinder body close to the oil injection pipeline.

[0016] In some embodiments, the one-way valve includes a pressure plate and a compression spring disposed between the pressure plate and the cylinder opening.

[0017] In some embodiments, the plunger is slidably disposed in the cylinder body, and one end of the plunger extends through the cylinder body away from the opening of the oil injection pipeline;

[0018] The plunger is a hollow structure with openings at both ends.

[0019] In some embodiments, a return spring is further disposed in the cylinder body to move the plunger in a direction away from the one-way valve assembly.

[0020] A second aspect of an embodiment of the present application provides an internal combustion engine, comprising:

[0021] Internal combustion engine cylinder blocks and pistons;

[0022] A cooling oil passage is provided in the piston

[0023] In some embodiments, the cooling oil channel includes a cooling oil channel inlet and a cooling oil channel outlet;

[0024] The cooling oil channel inlet of the cooling oil channel abuts against and is communicated with an opening of one end of the plunger extending out of the cylinder body.

[0025] In some embodiments, one end of the oil injection pipe away from the nozzle faces the bottom of the piston.

[0026] In some embodiments, the nozzle is connected to a cylinder block of an internal combustion engine.

[0027] The embodiments of the present application provide a piston cooling device and an internal combustion engine. After the nozzle injects cooling lubricating oil, the bottom of the piston is cooled through the oil injection pipe, and the cooling lubricating oil is injected into the cooling oil channel in the piston through the plunger in the cylinder body to cool the inside of the piston. Both the inside and the outside of the piston can be cooled, thereby improving the cooling efficiency of the piston and avoiding insufficient cooling efficiency of the piston, which leads to reduced working efficiency and life of the piston.

[0028] By cooling the outside and inside of the piston at the same time, when the internal combustion engine continues to increase its power, the piston can be prevented from being deformed due to the increasing heat load on the piston, causing the gap between the piston and the cylinder wall of the internal combustion engine to increase, thereby affecting the compression ratio and power output of the engine. It can also be prevented from burning the piston surface due to high temperature, causing the piston surface to become rough, thereby affecting the sealing between the piston and the cylinder wall of the internal combustion engine, and increasing wear and fuel consumption.

[0029] Avoid high temperatures that may cause lubricating oil to deteriorate and lose its lubricating properties, leading to increased engine wear and even engine jamming and other malfunctions. Avoid high temperatures that may increase the pressure and temperature in the combustion chamber, causing the fuel in the combustion chamber to spontaneously ignite and cause cylinder explosion. In severe cases, it may cause engine damage in order to improve fuel economy and reduce accessory power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the structure provided for the downward movement of the piston in the embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure provided for the upward movement of the piston in the embodiment of the present application;

[0033] Figure 3 This is a cross-sectional schematic diagram of the piston provided in the embodiment of the present application.

[0034] 1. Nozzle; 2. Oil injection pipeline; 3. Oil cylinder; 31. Cylinder body; 32. Plunger; 33. Return spring; 4. Cooling oil channel; 5. Internal combustion engine cylinder body; 6. Compression spring; 7. Pressure plate; 8. Piston. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] The embodiments of the present application provide a piston cooling device and an internal combustion engine, which can solve the problem that the power of the existing internal combustion engine is continuously increased, resulting in insufficient cooling efficiency of the piston by the piston cooling device.

[0037] See also Figure 1-3 As shown, a first aspect of an embodiment of the present application provides a piston cooling device, the piston cooling device comprising:

[0038] Nozzle 1 is used to be installed on the internal combustion engine cylinder block 5 so that nozzle 1 is fixed, and nozzle 1 is connected and communicated with the oil supply port on the internal combustion engine cylinder block 5, cooling lubricating oil is injected into nozzle 1 through the oil supply port, and then transported to the oil injection pipe 2 through nozzle 1, and then cooling lubricating oil is provided to piston 8, so that the cooling lubricating oil cools the piston 8 to prevent the piston 8 from working.

[0039] The oil injection pipeline 2 is connected to the nozzle 1. The oil injection pipeline 2 is communicated with the nozzle 1. When the cooled lubricating oil is injected into the nozzle 1, the nozzle 1 injects the cooled lubricating oil into the oil injection pipeline 2, and then the oil is injected into the piston 8 through the guide of the oil injection pipeline 2, so that the outside of the piston 8 can be cooled. Figure 1 As shown, the oil injection pipe 2 may preferably be an L-shape flipped 180° around the Y axis, wherein one end of the bottom opening is connected and communicated with the nozzle 1, and the other end is sprayed with cooling lubricating oil for cooling. The position of the oil cylinder 3 may preferably be arranged on the transverse pipe at the bottom of the oil injection pipe 2, the bottom of the oil cylinder 3 is in contact with the transverse pipe at the bottom of the oil injection pipe 2, and the side wall of the oil cylinder 3 is also in contact with the pipe in the vertical direction of the oil injection pipe 2.

[0040] The oil cylinder 3 is fixed on the oil injection pipe 2, one end of the oil cylinder 3 is connected to the oil injection pipe 2, and the other end is connected to the piston 8. When the nozzle 1 is injected with the cooled lubricating oil, the nozzle 1 transports the cooled lubricating oil into the oil injection pipe 2. When the cooled lubricating oil flows in the oil injection pipe 2, in addition to being sprayed out through the pipe of the oil injection pipe 2, it also flows into the oil cylinder 3. The cooling lubricating oil is transported to the inside of the piston 8 through the force of the oil cylinder 3, so that the cooled lubricating oil can cool the inside of the piston 8, so that the piston 8 can cool the inside while cooling the outside.

[0041] By cooling the outside and the inside of the piston 8 at the same time, when the internal combustion engine continues to increase its power, the piston 8 can be prevented from being deformed due to the high temperature due to the increasing heat load of the piston 8, thereby increasing the gap between the piston 8 and the cylinder wall of the internal combustion engine cylinder block 5, thereby affecting the compression ratio and power output of the engine, and preventing the surface of the piston 8 from being burned due to the high temperature, causing the surface of the piston 8 to become rough, thereby affecting the sealing between the piston 8 and the cylinder wall of the internal combustion engine cylinder block 5, and increasing wear and fuel consumption.

[0042] Avoid high temperatures that may cause lubricating oil to deteriorate and lose its lubricating properties, leading to increased engine wear and even engine jamming and other malfunctions. Avoid high temperatures that may increase the pressure and temperature in the combustion chamber, causing the fuel in the combustion chamber to spontaneously ignite and cause cylinder explosion. In severe cases, it may cause engine damage in order to improve fuel economy and reduce accessory power consumption.

[0043] In some optional embodiments, see Figure 1-2 As shown, in the piston cooling device, the oil cylinder 3 includes a cylinder body 31, a plunger 32 arranged in the cylinder body 31 and a one-way valve arranged in the cylinder body 31, wherein the cylinder body 31 is a hollow structure with openings at both ends, and the cylinder body 31 is connected to the oil injection pipe 2 through an opening at one end close to the oil injection pipe 2. When the cooling lubricating oil enters the nozzle 1, the cooling lubricating oil will also be injected into the cylinder body 31 while passing through the oil injection pipe 2, so that the cylinder body 31 is filled with the cooling lubricating oil to cool the inside of the piston 8.

[0044] The plunger 32 is a hollow columnar structure. The plunger 32 includes a column. Both ends of the column of the plunger 32 are turned outward to form outer edges. The outer edge of one end of the plunger 32 is connected to the piston 8 and communicates with the interior of the piston 8. The other end is arranged inside the cylinder 31, and the outer edge of the end arranged inside the cylinder 31 is in slidable fit contact with the inner wall of the cylinder 31 to avoid gap shaking when the plunger 32 slides in the cylinder 31, resulting in the opening at the other end of the plunger 32 being unable to contact the piston 8, so that the cooling lubricating oil cannot be delivered to the interior of the piston 8. The outer edge of the column plays a guiding role. At the same time, the outer edge of the column forms a nearly sealed state for the space below one end of the plunger 32 in the cylinder body 31. When the plunger 32 moves downward, the cooling lubricating oil in this space can be squeezed so that the cooling lubricating oil can only be sprayed out through the opening of the plunger 32. The pressure of the squeeze increases the pressure in this space, which increases the pressure of the cooling lubricating oil and can be sprayed into the interior of the piston 8, thereby preventing the cooling lubricating oil from entering the interior of the piston 8 due to insufficient pressure, or too little entering, resulting in reduced cooling efficiency.

[0045] The plunger 32 can be pushed downward as the piston 8 descends, and can be moved upward to its original position by the elastic force of the return spring 33 .

[0046] Among them, the one-way valve is used to close and open the opening connecting the cylinder body 31 and the oil injection pipe 2. An opening is also provided on the side wall where the oil injection pipe 2 contacts the cylinder body 31. The opening on the end of the oil cylinder 3 that contacts the oil injection pipe 2 is connected to the opening on the oil injection pipe 2 and connected to form a connecting port. The one-way valve is arranged on the opening of the cylinder body 31 and is used to open and close this connecting port. When it is opened, the cooling lubricating oil through the oil injection pipe 2 can be injected into the cylinder body 31. When it is closed, the cooling lubricating oil can be prevented from being squeezed out through the connecting port when the plunger 32 pressurizes the cylinder body 31 during downward movement, so as to prevent the cooling lubricating oil from being squeezed out through the connecting port, resulting in the inability to spray out through the plunger 32. By closing the one-way valve, the cooling lubricating oil in the cylinder body 31 can be ensured to have only one opening when it is injected into the piston 8, thereby guiding the injection direction of the cooling lubricating oil.

[0047] In some optional embodiments, see Figure 1-2 As shown, in the piston cooling device, the one-way valve includes a pressure plate 7 and a compression spring 6 arranged between the pressure plate 7 and the opening of the cylinder body 31, wherein the diameter of the compression spring 6 is larger than the diameter of the opening of the cylinder body 31 close to the injection pipe 2, so as to avoid the compression spring 6 from falling from the opening of the cylinder body 31 due to the diameter being too small and failing to restore the pressure plate 7, wherein one end of the return spring 33 is fixed to the side of the pressure plate 7 away from the compression spring 6.

[0048] When the piston 8 is driven to move downward, the plunger 32 is driven to move toward the one-way valve. When the plunger 32 is pressed down, the cylinder body 31 is injected with cooling lubricating oil. The downward pressure of the plunger 32 will compress the space of the cooling lubricating oil in the cylinder body 31. The compression of the space and the unchanged volume of the cooling lubricating oil inside will change the pressure inside the cylinder body 31, thereby increasing the pressure of the cooling lubricating oil. The pressure of the cooling lubricating oil can be used to apply pressure to the pressure plate 7 to move the pressure plate 7 toward the opening connecting the cylinder body 31 and the oil injection pipe 2 until the opening connecting the closed cylinder body 31 and the oil injection pipe 2 is covered. This can prevent the cooling lubricating oil from being pressurized and flowing back into the oil injection pipe 2 through the opening connecting the closed cylinder body 31 and the oil injection pipe 2, so that the cooling lubricating oil cannot return to the oil injection pipe 2. When the cooling lubricating oil is pressurized, it will only be ejected through the plunger 32 after being pressurized, and then enter the interior of the piston 8 for cooling.

[0049] When the piston 8 is driven to rise, the plunger 32 will be pushed up by the elastic force of the return spring 33 to maintain contact and communication with the piston 8. The cylinder body 31 is pressed down by the plunger 32 to squeeze and spray out the cooling lubricating oil inside. After the plunger 32 rises, the space in the cylinder body 31 increases, but the volume of the cooling lubricating oil decreases, so the pressure in the cylinder body 31 decreases. Then, the elastic force of the compression spring 6 is used to raise the pressure plate 7, so that the opening connecting the cylinder body 31 and the oil injection pipe 2 is reopened, so that the cooling lubricating oil that has entered the oil injection pipe 2 can enter the cylinder body 31 again, so that the cooling lubricating oil used next time can be stored in the cylinder body 31.

[0050] In some optional embodiments, see Figure 1-2 As shown, the plunger 32 is a hollow columnar structure, and the plunger 32 includes a column. Both ends of the column of the plunger 32 are turned outward to form outer edges. The outer edge of one end of the plunger 32 is connected to the piston 8 and communicates with the interior of the piston 8, and the other end is arranged inside the cylinder body 31, and the outer edge of the end arranged inside the cylinder body 31 is in slidable fit contact with the inner wall of the cylinder body 31, so as to avoid gap shaking when the plunger 32 slides in the cylinder body 31, resulting in the opening of the other end of the plunger 32 unable to contact the piston 8, so that the cooling lubricating oil cannot be transported to the interior of the piston 8, and the outer edge of the column plays a guiding role. At the same time, through the outer edge of the column, the space below one end of the plunger 32 located in the cylinder body 31 is formed into a nearly sealed state.

[0051] When the plunger 32 moves downward, the cooling lubricating oil in this space can be squeezed so that the cooling lubricating oil can only be sprayed out through the opening of the plunger 32. The pressure of the squeeze increases the pressure in this space, which increases the pressure of the cooling lubricating oil and can be sprayed into the interior of the piston 8, thereby preventing the cooling lubricating oil from entering the interior of the piston 8 due to insufficient pressure or too little entering, resulting in reduced cooling efficiency.

[0052] When the piston 8 is driven to move downward, the plunger 32 extends out of the cylinder body 31 and is connected to the piston 8. The piston 8 moving downward is also squeezed downward, driving the plunger 32 to move in the direction of the one-way valve. When the plunger 32 is pressed down, the cylinder body 31 is injected with cooling lubricating oil. The downward pressure of the plunger 32 will compress the space of the cooling lubricating oil in the cylinder body 31. The compression of the space and the unchanged volume of the cooling lubricating oil inside will change the pressure inside the cylinder body 31, increasing the pressure of the cooling lubricating oil. The one-way valve can be closed by the pressure of the cooling lubricating oil, so that the cooling lubricating oil cannot return to the oil injection pipe 2. At the same time, the end of the plunger 32 connected to the piston 8 is pressed down by the piston 8 to seal the end of the plunger 32. When subjected to pressure, the cooling lubricating oil will only be ejected through the hollow channel inside the plunger 32 after being pressurized, and then enter the interior of the piston 8 through the hollow channel of the plunger 32 for cooling.

[0053] When the piston 8 is driven to rise, the end of the plunger 32 extending out of the cylinder body 31 is not fixedly connected to the piston 8, so it will not rise with the rise of the piston 8. When the piston 8 rises, the pressure on the plunger 32 pressed down by the piston 8 will be reduced. At this time, the plunger 32 will be pushed up by the elastic force of the return spring 33, and with the elastic push of the return spring 33, it can rise with the rise of the piston 8, maintain contact and communication with the piston 8, and avoid skewness and tilt, which will cause the opening of the plunger 32 to be unable to communicate with the piston 8 when the piston 8 moves downward next time, which will also cause the cooling lubricating oil to be unable to smoothly enter the piston 8, so the setting of the return spring 33 can make the plunger 32 keep synchronized with the movement of the piston 8 at all times, so that the cooling lubricating oil can continuously enter the piston 8 for cooling, and when the piston 8 rises, the plunger 32 rises synchronously, the cylinder 31 is pressed down by the plunger 32 to squeeze and spray out the cooling lubricating oil inside. After the plunger 32 rises, the space in the cylinder 31 increases, but the volume of the cooling lubricating oil decreases, so the pressure in the cylinder 31 is reduced, the one-way valve can be opened, and the cooling lubricating oil entering the oil injection pipe 2 can be re-entered into the cylinder 31, so that the cooling lubricating oil used next time is stored in the cylinder 31.

[0054] As the piston 8 repeatedly rises and falls, the cooling lubricating oil can be continuously injected into the interior of the piston 8 for cooling, thereby preventing the temperature inside the piston 8 from being too high and improving the cooling efficiency of the piston 8.

[0055] See also Figure 1-3 As shown, the second aspect of the embodiment of the present application provides an internal combustion engine, which includes an internal combustion engine cylinder 5 and a piston 8, wherein a cooling oil channel 4 is opened in the piston 8, wherein one end of the plunger 32 extending out of the cylinder 31 is connected and communicated with the cooling oil channel 4, and when the cooling lubricating oil enters the cylinder 31, it is sprayed into the cooling oil channel 4 through the plunger 32, so that the interior of the piston 8 can be cooled, thereby improving the cooling efficiency.

[0056] Among them, the cooling oil channel 4 is an annular channel, which is located inside the head of the piston 8, and the cooling oil channel 4 includes a cooling oil channel inlet and a cooling oil channel outlet. The cooling oil channel inlet of the cooling oil channel 4 is connected to the opening of the plunger 32, and the cooling oil channel outlet of the cooling oil channel 4 is located on the back of the head of the piston 8. The back of the piston 8 is the side connected to the rod of the piston 8, which can also be understood as the side of the oil injection pipe 2 that sprays.

[0057] The working principle of the internal combustion engine is that when the car starts, the piston 8 moves up and down in the internal combustion engine cylinder 5, completing four basic processes such as intake, compression, explosion and exhaust. When the piston 8 moves downward, the pressure in the internal combustion engine cylinder 5 decreases, the valve opens, and the piston 8 slowly moves downward from the top of the internal combustion engine cylinder 5, so that the pressure in the internal combustion engine cylinder 5 decreases, and the gasoline and air mixture is then sucked into the internal combustion engine cylinder 5.

[0058] After the intake stroke is completed, the piston 8 starts to move upward, the valve is closed, and the gasoline and air mixture in the internal combustion engine cylinder 5 is compressed. In this process, the pressure and temperature in the internal combustion engine cylinder 5 increase, making the mixture more likely to burn. When the piston 8 moves to the highest point, the ignition system will emit electric sparks to the mixture in the internal combustion engine cylinder 5, causing the mixture to burn, generating high-temperature and high-pressure gas, pushing the piston 8 downward. After the detonation stroke is completed, the piston 8 moves upward, opens the exhaust valve, and discharges the exhaust gas from the internal combustion engine cylinder 5. After the exhaust stroke is completed, the piston 8 returns to its original position and starts the next cycle.

[0059] Working principle and process of this application:

[0060] When the piston 8 is driven to move downward, the plunger 32 extends out of the cylinder body 31 and is connected to the piston 8. The piston 8 moving downward is also squeezed downward, driving the plunger 32 to move in the direction of the one-way valve. When the plunger 32 is pressed downward, the cylinder body 31 is injected with cooling lubricating oil. The downward pressure of the plunger 32 will compress the space of the cooling lubricating oil in the cylinder body 31. The compression of the space and the unchanged volume of the cooling lubricating oil inside will change the pressure inside the cylinder body 31, thereby increasing the pressure of the cooling lubricating oil. The pressure of the cooling lubricating oil can be used to press the pressure plate 7 so that the pressure plate 7 moves toward the cylinder body 31. The opening connecting the cylinder body 31 and the oil injection pipe 2 moves until it covers the opening connecting the closed cylinder body 31 and the oil injection pipe 2, so as to prevent the cooled lubricating oil from flowing back into the oil injection pipe 2 through the opening connecting the closed cylinder body 31 and the oil injection pipe 2 after being pressurized, so that the cooled lubricating oil cannot return to the oil injection pipe 2. At the same time, the end of the plunger 32 connected to the piston 8 is pressed down and abutted by the piston 8, so that the end of the plunger 32 is sealed. When subjected to pressure, the cooling lubricating oil will only be ejected through the hollow channel inside the plunger 32 after being pressurized, and then enter the interior of the piston 8 through the hollow channel of the plunger 32 for cooling.

[0061] When the piston 8 is driven to rise, the end of the plunger 32 extending out of the cylinder body 31 is not fixedly connected to the piston 8, so it will not rise with the rise of the piston 8. When the piston 8 rises, the pressure on the plunger 32 pressed down by the piston 8 will be reduced. At this time, the plunger 32 will be pushed up by the elastic force of the return spring 33, and with the elastic push of the return spring 33, it can rise with the rise of the piston 8, maintain contact and communication with the piston 8, and avoid skewness and tilting, which will cause the opening of the plunger 32 to be unable to communicate with the piston 8 when the piston 8 moves downward next time, which will also cause the cooling lubricating oil to be unable to smoothly enter the piston 8. Therefore, the setting of the return spring 33 can The plunger 32 is kept synchronized with the movement of the piston 8 at all times, so that the cooling lubricating oil can continue to enter the piston 8 for cooling. When the piston 8 rises, the plunger 32 rises synchronously, and the cylinder 31 is pressed down by the plunger 32 so that the cooling lubricating oil inside is squeezed and sprayed out. After the plunger 32 rises, the space in the cylinder 31 increases, but the volume of the cooling lubricating oil decreases, so the pressure in the cylinder 31 decreases, and then the elastic force of the compression spring 6 is used to raise the pressure plate 7, so that the opening connecting the cylinder 31 and the oil injection pipe 2 is reopened, so that the cooling lubricating oil that has entered the oil injection pipe 2 can enter the cylinder 31 again, so that the cylinder 31 can store the cooling lubricating oil for next use.

[0062] As the piston 8 repeatedly rises and falls through the plunger 32, the cooled lubricating oil can be continuously injected into the interior of the piston 8 for cooling, thereby improving the cooling efficiency of the piston 8, avoiding the increasing heat load of the piston 8, causing the piston 8 to deform due to high temperature, and increasing the gap between the piston 8 and the cylinder wall of the internal combustion engine cylinder block 5, thereby affecting the compression ratio and power output of the engine, avoiding the surface of the piston 8 to be burned due to high temperature, causing the surface of the piston 8 to become rough, thereby affecting the sealing between the piston 8 and the cylinder wall of the internal combustion engine cylinder block 5, increasing wear and fuel consumption, avoiding high temperature causing the lubricating oil to deteriorate and lose its lubricating properties, resulting in increased engine wear and even jamming and other faults, avoiding high temperature that will increase the pressure and temperature in the combustion chamber, causing the fuel in the combustion chamber to spontaneously ignite, causing cylinder explosion, and even engine damage in severe cases, in order to improve fuel economy and reduce accessory power consumption.

[0063] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0064] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0065] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A piston cooling device, characterized in that: include: Nozzle (1); An oil injection pipeline (2), the oil injection pipeline (2) being in communication with the nozzle (1), the oil injection pipeline (2) being used to allow lubricating oil to pass through the outside of the piston (8) for cooling; An oil cylinder (3), one end of the oil cylinder (3) being in communication with the oil injection pipe (2), and the other end of the oil cylinder (3) being in communication with the piston (8) so as to cool the interior of the piston (8); The oil cylinder (3) comprises a cylinder body (31), a plunger (32) arranged in the cylinder body (31), and a one-way valve arranged in the cylinder body (31); The cylinder body (31) is a hollow structure with openings at both ends, and one end of the cylinder body (31) close to the oil injection pipeline (2) is connected to the oil injection pipeline (2) through the opening; The one-way valve is arranged on an opening of the cylinder body (31) close to the oil injection pipe (2); The one-way valve comprises a pressure plate (7) and a compression spring (6) arranged between the pressure plate (7) and an opening of the cylinder body (31); The plunger (32) is slidably disposed in the cylinder body (31), and one end of the plunger (32) extends out through the cylinder body (31) away from the opening of the oil injection pipe (2); The plunger (32) is a hollow structure with openings at both ends; A return spring (33) is also provided in the cylinder body (31) for causing the plunger (32) to move in a direction away from the one-way valve assembly.

2. An internal combustion engine using the piston cooling device according to claim 1, characterized in that: include: Internal combustion engine cylinder block (5) and piston (8); A cooling oil passage (4) is provided in the piston (8).

3. The internal combustion engine according to claim 2, characterized in that: The cooling oil channel (4) comprises a cooling oil channel inlet and a cooling oil channel outlet; The cooling oil channel inlet of the cooling oil channel (4) abuts against and communicates with an opening at one end of the plunger (32) extending out of the cylinder body (31).

4. The internal combustion engine according to claim 3, characterized in that: The end of the oil injection pipe (2) away from the nozzle (1) faces the bottom of the piston (8).

5. The internal combustion engine according to claim 4, characterized in that: The nozzle (1) is connected to a cylinder block (5) of an internal combustion engine.

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