Piston cooling system, crankcase and vehicle

Abstract

The invention discloses a piston cooling system, a crankcase and a vehicle, and relates to the technical field of engine cooling and lubrication.The piston cooling system comprises a piston body, an oil pan, an oil pump and an oil collecting component, the piston body reciprocates up and down in a cylinder sleeve, the cylinder sleeve comprises an oil inlet channel, and the piston body comprises an inner cooling oil sleeve and an opening; the inner cooling oil sleeve comprises an oil inlet and an oil outlet, the oil inlet is used for being communicated with the oil inlet channel, and the oil outlet is communicated with the opening; a partition plate is arranged in the oil pan and used for dividing an inner cavity of the oil pan into a first oil storage area and a second oil storage area, and a communicating hole is formed in the partition plate. The oil pump is used for conveying the oil pump in the first oil storage area to the oil inlet channel; the oil collecting component comprises an inlet and an outlet which are communicated with each other, the inlet is arranged at the bottom of the opening, and the outlet is arranged at the top of the second oil storage area. According to the piston cooling system, high-temperature engine oil and low-temperature engine oil are distinguished, an engine oil cooler does not need to be arranged, and therefore the production cost of the whole piston cooling system is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of engine cooling and lubrication, and in particular to a piston cooling system, a crankcase and a vehicle. Background Art

[0002] When the automobile engine is working, the combustion of the combustible mixture in the combustion chamber generates a lot of heat. The combustion chamber is composed of the space surrounded by the cylinder head, cylinder liner, and piston. The cylinder head and cylinder liner are equipped with cooling water jackets. There is continuously circulating cooling water inside the water jacket to cool the cylinder head and cylinder liner to avoid deformation and damage to the cylinder head and cylinder liner due to excessive temperature. Since the piston moves up and down at a high speed and the piston head directly contacts the inside of the combustion chamber, the temperature of the piston head is particularly high. Generally, the piston cooling nozzle is used to spray oil into the cavity at the bottom of the piston to reduce the temperature of the piston top and avoid damage to the piston.

[0003] At present, a piston cooling nozzle (PCJ) is generally provided on one side of the engine cylinder block, and the PCJ oil channel is connected to the main oil channel of the engine. Lubricating oil of a certain pressure is sprayed into the bottom cavity of the piston through the PCJ. The sprayed pressurized oil forms a mist at the nozzle mouth and has a certain fan shape. The fan-shaped oil mist is sprayed into the bottom cavity of the piston. The bottom cavity of the piston and the top of the piston are separated by only a certain wall thickness. The sprayed oil can cool the top of the piston, and the oil temperature of the oil sprayed to the bottom of the piston rises and then returns to the oil pan. The oil will also return to the oil pan after lubrication at other positions. Then, the overall oil temperature rises after the two types of oil are mixed. Especially when the engine is under high load conditions, it is necessary to cool the oil by setting an oil cooler on the oil channel and then lubricate each oil-using component in the main oil channel of the engine. This will increase the cost of the entire system and also increase the flow resistance of the system. Especially at low temperature starting, the oil temperature is low, the oil viscosity is large, and the flow resistance of the oil cooler is very large.

[0004] Therefore, it is necessary to provide a new piston cooling system, crankcase and vehicle to solve the above-mentioned technical problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a piston cooling system, a crankcase and a vehicle, aiming to improve the technical problems of high cost and large flow resistance of the piston cooling system in the prior art.

[0006] To achieve the above object, the present invention provides a piston cooling system, the piston cooling system comprising:

[0007] A piston body, the piston body reciprocates up and down in the cylinder sleeve, the cylinder sleeve includes an oil inlet passage, the piston body includes an inner cooling oil jacket and an opening, the inner cooling oil jacket includes an oil inlet and an oil outlet, the oil inlet is used to communicate with the oil inlet passage, and the oil outlet is communicated with the opening;

[0008] An oil pan, wherein a partition plate is provided in the oil pan for dividing an inner cavity of the oil pan into a first oil storage area and a second oil storage area, and the partition plate is formed with a communication hole;

[0009] an oil pump, the oil pump being used to pump the oil in the first oil storage area to the oil inlet passage;

[0010] The oil collecting component comprises an inlet and an outlet which are connected to each other, wherein the inlet is arranged at the bottom of the opening, and the outlet is arranged at the top of the second oil storage area.

[0011] In one embodiment, a plurality of heat dissipation fins are disposed on the outer surface of the oil pan, and the plurality of heat dissipation fins are disposed on a side close to the second oil storage area.

[0012] In one embodiment, the second oil storage area is configured to be disposed on a windward side of a vehicle.

[0013] In one embodiment, the aperture of the oil inlet passage is larger than the aperture of the oil inlet port.

[0014] In one embodiment, there are multiple oil inlet passages, and the multiple oil inlet passages are arranged on the cylinder liner at intervals along the vertical direction.

[0015] In one embodiment, a gap is formed between the outer side of the piston body and the cylinder sleeve, and the gap is filled with engine oil to form an oil film.

[0016] In one embodiment, a first ring groove is provided on the outer surface of the top of the piston body, and the piston cooling system further includes a first piston ring, which is clamped in the first ring groove and extends out of the piston body, and contacts the inner wall of the cylinder liner.

[0017] In one embodiment, a second ring groove is further provided on the outer surface of the top of the piston body, and the second ring groove is provided at the bottom of the first ring groove. The piston cooling system also includes a second piston ring, which is clamped in the second ring groove and extends out of the piston body, and the second piston ring contacts the inner wall of the cylinder liner.

[0018] In one embodiment, the oil inlet passage is inclined toward the piston body, and the internal cooling oil jacket includes a first connecting section, a second connecting section and a third connecting section that are connected in sequence, the first connecting section is inclined, the second connecting section is horizontally arranged, the first connecting section is connected to the oil inlet passage, and the third connecting section is connected to the opening.

[0019] In one embodiment, the piston cooling system further includes a main oil channel, a solenoid valve and an injection oil channel which are connected in sequence, the oil pump is used to pump the oil in the first oil storage area to the main oil channel, and the injection oil channel is connected to the oil inlet channel.

[0020] In one embodiment, the piston cooling system further includes a first lubrication assembly and a second lubrication assembly, wherein one end of each of the first lubrication assembly and the second lubrication assembly is connected to the main oil channel, the other end of the first lubrication assembly is connected to the first oil storage area, and the other end of the second lubrication assembly is connected to the second oil storage area.

[0021] The present invention also provides a crankcase, comprising a cylinder block, a cylinder head and the above-mentioned piston cooling system, wherein the oil pan, the cylinder block and the cylinder head form an inner cavity of the crankcase, and the bottom of the piston body is provided with a cavity interconnected with the openings, and the cavity is interconnected with the inner cavity.

[0022] The present invention also provides a vehicle, comprising the piston cooling system described above; or the crankcase described above.

[0023] In the above scheme, the piston cooling system includes a piston body, an oil pan, an oil pump and an oil collecting component. The piston body reciprocates up and down in the cylinder liner. The cylinder liner includes an oil inlet passage. The piston body includes an inner cooling oil jacket and an opening. The inner cooling oil jacket includes an oil inlet and an oil outlet. The oil inlet is used to communicate with the oil inlet passage, and the oil outlet is connected to the opening. A partition plate is provided in the oil pan to separate the inner cavity of the oil pan into a first oil storage area and a second oil storage area. The partition plate is formed with a connecting hole. The oil pump is used to pump the oil in the first oil storage area to the oil inlet passage. The oil collecting component includes an inlet and an outlet that are connected to each other. The inlet is arranged at the bottom of the opening, and the outlet is arranged at the top of the second oil storage area. When the piston body is in the lower dead center position, the oil inlet of the inner cooling oil jacket of the piston body is connected with the oil inlet passage, and the engine oil will be sprayed into the inner cooling oil jacket and fill the entire inner cooling oil jacket to cool the top of the piston body. The engine oil in the inner cooling oil jacket will absorb the heat from the top of the piston body, and the engine oil will heat up. When the piston body continues to move upward from the lower dead center, the oil inlet of the inner cooling oil jacket will be staggered from the oil inlet passage. At this time, the engine oil cannot enter the inner cooling oil jacket, and the engine oil in the inner cooling oil jacket will flow out from the oil outlet to the opening, and then flow out from the opening to the inlet of the oil collecting component, and then enter the second oil storage area of ​​the oil pan from the outlet of the oil collecting component. In this way, the high-temperature engine oil is collected and the low-temperature of other oil-using components of the engine is cooled. The engine oil returns to the first oil storage area through a special oil return channel, so that the high-temperature engine oil is cooled by itself in the second oil storage area alone. When the piston body needs to be cooled later, the oil pump will draw low-temperature engine oil from the first storage area and repeat the above steps to cool the top of the piston body. After the high-temperature engine oil is cooled in the second oil storage area 23, it will enter the first storage area from the connecting hole; therefore, in the present invention, high-temperature engine oil and low-temperature engine oil are distinguished, the high-temperature oil storage area is arranged on the windward side of the vehicle, and cooling fins are arranged in the high-temperature oil storage area, which increases the heat dissipation efficiency of the high-temperature engine oil. In this way, there is no need to set an oil cooler in the entire piston cooling system to cool the oil pumped by the oil pump, which saves the cost of the oil cooler, thereby reducing the production cost of the entire piston cooling system, and at the same time saves the oil cooler, so that the engine oil does not need to flow through the oil cooler for cooling, which will reduce the flow resistance of the piston cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of an embodiment of a piston cooling system provided by the present invention;

[0026] Figure 2 A schematic diagram of the connection between a piston body and a cylinder sleeve according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic structural diagram of an oil pan embodiment provided by the present invention.

[0028] Description of Figure Numbers:

[0029] 100. Piston cooling system; 1. Piston body; 2. Oil pan; 3. Oil collecting component; 4. Oil suction plate; 5. Cylinder liner; 51. Oil inlet passage; 11. Internal cooling oil jacket; 12. Opening; 111. Oil inlet; 112. Oil outlet; 21. Partition plate; 22. First oil storage area; 23. Second oil storage area; 211. Connecting hole; 31. Inlet; 32. Outlet; 6. Gap; 13. First annular groove; 14. Second annular groove; 113. First connecting section; 114. Second connecting section; 115. Third connecting section; 100a. Main oil channel; 100b. Solenoid valve; 100c. Injection oil channel; 100d. First lubrication assembly; 100e. Second lubrication assembly.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] When the automobile engine is working, the combustion of the combustible mixture in the combustion chamber generates a lot of heat. The combustion chamber is composed of the space surrounded by the cylinder head, cylinder liner, and piston. The cylinder head and cylinder liner are equipped with cooling water jackets. There is continuously circulating cooling water inside the water jacket to cool the cylinder head and cylinder liner to avoid deformation and damage to the cylinder head and cylinder liner due to excessive temperature. Since the piston moves up and down at a high speed and the piston head directly contacts the inside of the combustion chamber, the temperature of the piston head is particularly high. Generally, the piston cooling nozzle is used to spray oil into the cavity at the bottom of the piston to reduce the temperature of the piston top and avoid damage to the piston.

[0035] At present, a piston cooling nozzle (PCJ) is generally provided on one side of the engine cylinder block, and the PCJ oil channel is connected to the main oil channel of the engine. Lubricating oil of a certain pressure is sprayed into the bottom cavity of the piston through the PCJ. The sprayed pressurized oil forms a mist at the nozzle mouth and has a certain fan shape. The fan-shaped oil mist is sprayed into the bottom cavity of the piston. The bottom cavity of the piston and the top of the piston are separated by only a certain wall thickness. The sprayed oil can cool the top of the piston, and the oil temperature of the oil sprayed to the bottom of the piston rises and then returns to the oil pan. The oil will also return to the oil pan after lubrication at other positions. Then, the overall oil temperature rises after the two types of oil are mixed. Especially when the engine is under high load conditions, it is necessary to cool the oil by setting an oil cooler on the oil channel and then lubricate each oil-using component in the main oil channel of the engine. This will increase the cost of the entire system and also increase the flow resistance of the system. Especially at low temperature starting, the oil temperature is low, the oil viscosity is large, and the flow resistance of the oil cooler is very large.

[0036] See also Figures 1 to 3The present invention proposes a piston cooling system 100, which includes a piston body 1, an oil pan 2, an oil pump and an oil collecting component 3. The piston body 1 reciprocates up and down in the cylinder sleeve 5. The cylinder sleeve 5 includes an oil inlet passage 51. The piston body 1 includes an inner cooling oil jacket 11 and an opening 12. The inner cooling oil jacket 11 includes an oil inlet 111 and an oil outlet 112. The oil inlet 111 is used to communicate with the oil inlet passage 51, and the oil outlet 112 is communicated with the opening 12; a partition plate 21 is provided in the oil pan 2 to divide the inner cavity of the oil pan 2 into a first oil storage area 22 and a second oil storage area 23, and a connecting hole 211 is formed on the partition plate 21; the oil pump is used to pump the oil in the first oil storage area 22 to the oil inlet passage 51; the oil collecting component 3 includes an inlet 31 and an outlet 32 ​​that are connected to each other. The inlet 31 is arranged at the bottom of the opening 12, and the outlet 32 ​​is arranged at the top of the second oil storage area 23.Specifically, for a four-stroke engine, there are four strokes: intake, compression, power, and exhaust. The piston body 1 moves downward during the intake and power strokes, and moves upward during the compression and exhaust strokes. When the engine is running, it is determined whether the piston body 1 needs to be cooled based on the engine load. When the engine load is greater than a threshold, the oil pump pumps the oil to the oil inlet passage 51. When the piston body 1 moves downward in the cylinder liner 5 in the vertical direction and the piston body 1 is at the bottom dead center position, the oil inlet port 111 of the inner cooling oil jacket 11 of the piston body 1 is connected to the oil inlet passage 51, and the oil is sprayed into the inner cooling oil jacket 11. The cooling oil sleeve 11 is filled with the entire cooling oil sleeve 11 to cool the top of the piston body 1. The engine oil in the cooling oil sleeve 11 absorbs the heat from the top of the piston body 1, and the engine oil is heated. When the piston body 1 continues to move upward from the bottom dead center, the oil inlet 111 of the cooling oil sleeve 11 is offset from the oil inlet passage 51. At this time, the engine oil cannot enter the cooling oil sleeve 11. The engine oil in the cooling oil sleeve 11 flows out from the oil outlet 112 to the opening 12, and flows out from the opening 12 to the inlet 31 of the oil collecting component 3, and then enters the second oil storage area 23 of the oil pan 2 from the outlet 32 ​​of the oil collecting component 3. The high-temperature engine oil is collected, and the low-temperature engine oil of other oil-using parts of the engine is returned to the first oil storage area 22 through a special oil return channel. In this way, the high-temperature engine oil is cooled by itself in the second oil storage area 23. When the piston body 1 needs to be cooled later, the oil pump will draw the low-temperature engine oil from the first storage area and repeat the above steps to cool the top of the piston body 1. After the high-temperature engine oil is cooled in the second oil storage area 23, the oil pump sucks oil, causing the oil level in the first oil storage area 22 to drop. Due to the U-tube principle, the engine oil in the second oil storage area 23 will be replenished to the first oil storage area 22 to maintain the first oil storage area. The liquid levels of the oil area 22 and the second oil storage area 23 are consistent, and the oil in the second oil storage area 23 will enter the first storage area from the connecting hole 211; therefore, in this embodiment, the high-temperature oil and the low-temperature oil are distinguished, so that there is no need to set an oil cooler in the entire piston cooling system 100 to cool the oil pumped by the oil pump, thereby saving the cost of the oil cooler, thereby reducing the production cost of the entire piston cooling system 100, and at the same time saving the oil cooler, so that the oil does not need to flow through the oil cooler for cooling, which will reduce the flow resistance of the piston cooling system 100.

[0037] See also Figure 1 and Figure 3Furthermore, the piston cooling system 100 also includes an oil suction pan 4, one end of which is connected to one end of the oil pump, and the other end of which is connected to the oil pan 2. The oil suction pan 4 is mainly used to collect and store the oil in the engine oil pan 2. When the engine is running, the oil will be transported to various parts that need lubrication, such as the crankshaft, connecting rod bearings, camshafts and piston body 1, through the oil pump. When the lubricating oil completes its lubrication task, it will flow back to the oil pan 2 at the bottom of the engine by gravity, and then be sucked into the oil suction pan 4. A filter screen or a magnetic plug-in is built into the oil suction pan 4, which can absorb metal chips and other impurities in the lubricating oil, reducing the wear of these impurities on the internal parts of the engine. The oil suction pan 4 also helps to keep the inside of the engine clean and prevent sediments such as sludge from affecting engine performance.

[0038] In one embodiment, the outer surface of the oil pan 2 is provided with a plurality of heat dissipation fins, and the plurality of heat dissipation fins are provided on a side close to the second oil storage area 23. Specifically, the heat of the high-temperature engine oil is transferred to the surface of the oil pan 2, and then the heat is conducted to the heat dissipation fins. The heat dissipation fins are usually made of materials with good thermal conductivity, such as copper, aluminum, etc., to ensure that the heat can be quickly transferred from the heat source to the heat dissipation fins. The heat dissipation fins increase the surface area in contact with the surrounding air, which makes it easier for the heat to be transferred to the surrounding air by convection. In the case of natural convection, the hotter air will rise, and the surrounding cooler air will flow in to fill the gap, forming air flow, which improves the cooling effect, so that the high-temperature engine oil in the second oil storage area 23 can be cooled faster; the cooling fins improve the heat dissipation efficiency by increasing the surface area. More surface area means more heat can be transferred to the surrounding environment faster. Since the design of the cooling fins can promote air flow, both natural convection and forced convection can effectively improve the heat dissipation efficiency. Compared with other complex heat dissipation solutions, cooling fins are a relatively simple and low-cost method. Cooling fins are usually simple in structure and easy to clean and maintain. They do not require additional power sources to work, reducing the possibility of failure. And since there are no moving parts, the cooling fins have high reliability and are not easily damaged.

[0039] In one embodiment, the second oil storage area 23 is used to be arranged on the windward side of the vehicle. Specifically, the second oil storage area 23 is arranged on the windward side of the vehicle. When the vehicle is running, the high-temperature oil in the second oil storage area 23 transfers heat to the oil pan 2, and then the oil pan 2 is cooled by the airflow in the direction of the front of the vehicle, thereby cooling the high-temperature oil in the second oil storage area 23. In this way, the high-temperature oil in the second oil storage area 23 can be cooled faster.

[0040] Furthermore, the second oil storage area 23 is arranged on the windward side of the vehicle, and a plurality of cooling fins are arranged on the outer surface of the oil pan 2 on one side close to the second oil storage area 23. The second oil storage area 23 of the oil pan 2 equipped with cooling fins is cooled by the airflow in the direction of the front of the vehicle. Since the air flow on the cooling fins is increased, the cooling efficiency of the second oil storage area 23 can be further improved.

[0041] In one embodiment, the diameter of the oil inlet passage 51 is larger than the diameter of the oil inlet port 111 . Specifically, when the engine is running, it is determined whether the piston body 1 needs to be cooled according to the engine load. When the engine load is greater than the threshold value, the oil pump pumps the oil to the oil inlet passage 51. When the piston body 1 moves downward in the cylinder sleeve 5 in the vertical direction and the piston body 1 is at the bottom dead center position, the oil inlet 111 of the inner cooling oil jacket 11 of the piston body 1 is connected with the oil inlet passage 51, and the engine oil will be sprayed into the inner cooling oil jacket 11 and fill the entire inner cooling oil jacket 11 to cool the top of the piston body 1. The engine oil in the inner cooling oil jacket 11 will absorb the heat from the top of the piston body 1 and the engine oil will heat up. Since the aperture of the oil inlet passage 51 is larger than the oil inlet 111, when the piston body 1 continues to move upward from the bottom dead center, the oil inlet passage 51 will be connected with the oil inlet 111 for a period of time, so that the inner cooling oil jacket 11 in the piston body 1 is filled with engine oil for a period of time, so that it can be ensured that the inner cooling oil jacket 11 is full of engine oil, thereby ensuring the effect of cooling the piston body 1.

[0042] In one embodiment, there are multiple oil inlet passages 51 , and the multiple oil inlet passages 51 are arranged on the cylinder liner 5 at intervals along the vertical direction. Specifically, when the engine is running, it is determined whether the piston body 1 needs to be cooled according to the engine load. When the engine load is greater than the threshold, the oil pump pumps the oil to the oil inlet passage 51. When the piston body 1 moves downward in the cylinder liner 5 in the vertical direction and the piston body 1 is at the bottom dead center position, the oil inlet port 111 of the inner cooling oil jacket 11 of the piston body 1 is connected with the oil inlet passage 51, and the engine oil will be sprayed into the inner cooling oil jacket 11 and fill the entire inner cooling oil jacket 11 to cool the top of the piston body 1. The engine oil in the inner cooling oil jacket 11 will absorb the heat from the top of the piston body 1, and the engine oil will heat up. When the piston body 1 continues to move upward from the bottom dead center, when the piston body 1 moves to the oil inlet port 111 and is connected with another oil inlet passage 51, the inner cooling oil jacket 11 can continue to be filled with engine oil. After injecting engine oil into the inner cooling oil jacket 11 for many times, it can be ensured that the inner cooling oil jacket 11 is filled with engine oil, thereby cooling the piston body 1.

[0043] See also Figure 1 and Figure 2In one embodiment, a gap 6 is formed between the outer side of the piston body 1 and the cylinder sleeve 5, and the gap 6 is filled with engine oil to form an oil film. Specifically, since the gap 6 is formed between the outer side of the piston body 1 and the cylinder sleeve 5, when the oil inlet passage 51 injects the engine oil toward the oil inlet port 111, the engine oil will flow into the gap 6, so that the engine oil will form an oil film in the gap 6. When the piston body 1 reciprocates up and down in the cylinder body, the oil film can lubricate the reciprocating motion of the piston body 1 to ensure the normal motion of the piston body 1. At the same time, the oil film can also form a certain sealing effect between the piston body 1 and the cylinder sleeve 5.

[0044] See also Figure 1 and Figure 2 In one embodiment, a first annular groove 13 is provided on the outer surface of the top of the piston body 1, and the piston cooling system 100 further includes a first piston ring, which is clamped in the first annular groove 13, and the first piston ring extends out of the piston body 1, and the first piston ring contacts the inner wall of the cylinder liner 5. The top of the piston body 1 is close to the combustion chamber, and the combustion chamber will produce high-temperature and high-pressure gas during operation, and the high-temperature and high-pressure gas will affect the components below the piston body 1, so it is necessary to seal these gases to prevent them from leaking. In this embodiment, a first annular groove 13 is provided on the top of the piston body 1, and the first piston ring is clamped in the first annular groove 13, and the first piston ring contacts the inner wall of the cylinder liner 5, so that the first piston ring will seal the space above the piston body 1 to prevent the leakage of high-temperature and high-pressure gas.

[0045] See also Figure 1 and Figure 2 In one embodiment, the outer surface of the top of the piston body 1 is further provided with a second annular groove 14, and the second annular groove 14 is provided at the bottom of the first annular groove 13. The piston cooling system 100 further includes a second piston ring, which is clamped in the second annular groove 14, and the second piston ring extends out of the piston body 1, and the second piston ring contacts the inner wall of the cylinder liner 5. Specifically, the second annular groove 14 is provided on the piston body 1, and the second piston ring is clamped in the second annular groove 14, and the second piston ring contacts the inner wall of the cylinder liner 5. The engine oil forms an oil film in the gap 6 formed between the outer side of the piston body 1 and the cylinder liner 5. When the piston body 1 moves downward, the oil film lubricates the movement of the piston body 1, and the second piston ring scrapes off the oil film, so that the engine oil can be prevented from entering the upper part of the piston body 1, that is, the engine oil is prevented from entering the combustion chamber, and the engine oil is prevented from burning in the combustion chamber, thereby causing a high engine oil consumption.

[0046] See also Figure 1 and Figure 2Furthermore, there are multiple second ring grooves 14, which are spaced apart in the vertical direction, and there are multiple second piston rings, which are equal to the number of the multiple second piston rings and the multiple second ring grooves 14, and are arranged one by one. When the piston body 1 moves downward, the multiple second piston rings will scrape out the oil film in turn. In this way, setting up multiple second piston rings can further improve the scraping efficiency of the oil film.

[0047] See also Figure 1 and Figure 2 In one embodiment, the oil inlet passage 51 is tilted toward the piston body 1, and the inner cooling oil jacket 11 includes a first connecting section 113, a second connecting section 114, and a third connecting section 115 that are connected in sequence. The first connecting section 113 is tilted, and the second connecting section 114 is horizontally arranged. The first connecting section 113 is connected to the oil inlet passage 51, and the third connecting section 115 is connected to the opening 12. The oil inlet passage 51 is tilted toward the piston body 1. Compared with the horizontal arrangement of the oil inlet passage 51, in this embodiment, the oil passage is tilted toward the piston body 1. When the oil pump pumps the oil into the inner cooling oil jacket 11, the injection direction follows the first connecting section 113, which can reduce obstruction and inject farther, that is, the pumping head is longer, ensuring that the oil can be pumped into the second connecting section 114, so that the second connecting section 114 can be quickly filled with oil, thereby cooling the piston body 1.

[0048] See also Figure 1 and Figure 2In one embodiment, the piston cooling system 100 further includes a main oil passage 100a, a solenoid valve 100b and an injection oil passage 100c which are connected in sequence. The oil pump is used to pump the oil in the first oil storage area 22 to the main oil passage 100a, and the injection oil passage 100c is connected to the oil inlet passage 51. Specifically, when the engine load is greater than a threshold value, the solenoid valve 100b is controlled to be connected, and the oil pump pumps the oil to the main oil passage 100a, and then enters the injection oil passage 100c through the solenoid valve 100b. The oil in the injection oil passage 100c flows into the inner cooling oil jacket 11 through the oil inlet passage 51. Assuming a four-stroke engine, after the engine load is greater than a threshold value, it is determined that the solenoid valve 100b needs to be opened, and when the camshaft phase sensor measures that the piston body 1 is at the bottom dead center position, the solenoid valve 100b is opened. The oil pump pumps the oil to the main oil channel 100a, and then enters the injection oil channel 100c through the solenoid valve 100b. The oil in the injection oil channel 100c flows into the inner cooling oil jacket 11 through the oil inlet channel 51. At this time, since the piston body 1 is at the bottom dead center, the oil inlet port 111 of the inner cooling oil jacket 11 is exactly aligned with the oil inlet channel 51 on the cylinder liner 5, and the oil will enter the inner cooling oil jacket 11 and fill the entire inner cooling oil jacket 11 to cool the top of the piston body 1. When the piston body 1 continues to move upward from the bottom dead center, the inner The oil inlet 111 of the oil cooler 11 is staggered from the oil inlet passage 51 on the cylinder liner 5. At this time, the engine oil cannot enter the inner oil cooler 11. At this time, the solenoid valve 100b can be controlled to be disconnected, so as to avoid wasting the engine oil. The engine oil in the inner oil cooler 11 will flow out from the oil outlet 112 to the opening 12, and flow out from the opening 12 to the inlet 31 of the oil collecting component 3, and then enter the second oil storage area 23 of the oil pan 2 from the outlet 32 ​​of the oil collecting component 3, so that the high-temperature engine oil is collected and the low-temperature engine oil of other oil-using components of the engine is collected. All of them return to the first oil storage area 22 through a special oil return channel, so that the high-temperature engine oil is cooled by itself in the second oil storage area 23 alone. When the piston body 1 needs to be cooled later, the oil pump will draw low-temperature engine oil from the first storage area and repeat the above steps to cool the top of the piston body 1. After the high-temperature engine oil is cooled in the second oil storage area 23, it will enter the first storage area from the connecting hole 211; in this embodiment, the main oil channel 100a and the injection oil channel 100c can be quickly connected or disconnected through the solenoid valve 100b.

[0049] See also Figure 1In one embodiment, the piston cooling system 100 further includes a first lubricating component 100d and a second lubricating component 100e. One end of the first lubricating component 100d and the second lubricating component 100e are both connected to the main oil channel 100a, the other end of the first lubricating component 100d is connected to the first oil storage area 22, and the other end of the second lubricating component 100e is connected to the second oil storage area 23. Specifically, when the engine is running, it is determined whether the piston body 1 needs to be cooled according to the engine load. When the engine load is greater than the threshold, the oil pump pumps the oil to the oil inlet channel 51. When the piston body 1 moves downward in the cylinder sleeve 5 in the vertical direction and the piston body 1 is at the bottom dead center position, the oil inlet port 111 of the inner cooling oil jacket 11 of the piston body 1 is just connected to the oil inlet channel 51, and the oil will be sprayed into the inner cooling oil jacket 11 and fill the entire inner cooling oil jacket 11 to cool the top of the piston body 1. The oil in the inner cooling oil jacket 11 will absorb the heat from the top of the piston body 1, and the oil will heat up. When the piston When the engine body 1 continues to move upward from the bottom dead center, the oil inlet 111 of the inner cooling oil jacket 11 is offset from the oil inlet passage 51, and the engine oil cannot enter the inner cooling oil jacket 11. The engine oil in the inner cooling oil jacket 11 will flow out from the oil outlet 112 to the opening 12, and flow out from the opening 12 to the inlet 31 of the oil collecting component 3, and then enter the second oil storage area 23 of the oil pan 2 from the outlet 32 ​​of the oil collecting component 3, so that the high-temperature engine oil is collected, and the engine oil in the main oil passage 100a will be diverted to the first lubrication assembly 100d and the second lubrication assembly 100e. The first lubrication assembly 100d will lubricate other oil-using parts in the engine. The heat generated during the operation of these components is small, and the temperature rise of the engine oil is small, so the low-temperature engine oil returns to the first oil storage area 22 through the special oil return channel, and the engine oil in the second lubrication component 100e flows to the supercharger. The supercharger compresses the air entering the engine to increase the intake density, thereby increasing the engine's specific power, improving combustion efficiency, saving fuel and reducing emissions. In this process, high temperature is generated, thereby increasing the temperature of the engine oil flowing out of the second lubrication component 100e, so that the high-temperature engine oil will flow back to the second oil storage area 23 and mix with the engine oil flowing out of the opening 12 of the piston body 1, so that the high-temperature engine oil The second oil storage area 23 is used for self-cooling. When the piston body 1 needs to be cooled later, the oil pump will draw low-temperature oil from the first storage area to repeat the above steps to cool the top of the piston body 1, and the high-temperature oil will enter the first storage area from the connecting hole 211 after being cooled in the second oil storage area 23. This arrangement can separate and lubricate the low-temperature lubricating oil and the high-temperature oil to prevent the low-temperature oil from mixing with the high-temperature oil, thereby causing the oil temperature in the first storage area to be too high, ensuring that the oil in the first storage area can quickly reduce the temperature of the piston body 1 after entering the piston body 1.

[0050] The present invention also provides a crankcase, including a cylinder block, a cylinder head and the above-mentioned piston cooling system 100, wherein the oil pan 2, the cylinder block and the cylinder head form an inner cavity of the crankcase, and the bottom of the piston body 1 is provided with a cavity interconnected by an opening 12, and the cavity and the inner cavity are interconnected. Specifically, since the piston body 1 moves upward at a high speed, the crankcase will generate a negative pressure in the cavity at the bottom of the piston body 1, and the negative pressure will draw the oil in the inner cooling oil jacket 11 into the oil pan 2, thereby sucking and emptying the oil in the inner cooling oil jacket 11; since the crankcase includes all the implementation methods of all the embodiments of the above-mentioned piston cooling system 100, it at least has all the beneficial effects brought by all the above-mentioned implementation methods, which will not be repeated here one by one.

[0051] The present invention further provides a vehicle, including the piston cooling system 100 or the crankcase. Since the vehicle includes all implementations of all embodiments of the piston cooling system 100 or all implementations of all embodiments of the crankcase, it at least has all the beneficial effects brought by all the above implementations, which will not be described one by one here.

[0052] In the description of the present application, the description with reference to the terms "some embodiments", "exemplarily", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0053] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A piston cooling system, characterized in that: The piston cooling system comprises: A piston body, the piston body reciprocates up and down in the cylinder sleeve, the cylinder sleeve includes an oil inlet passage, the piston body includes an inner cooling oil jacket and an opening, the inner cooling oil jacket includes an oil inlet and an oil outlet, the oil inlet is used to communicate with the oil inlet passage, and the oil outlet is communicated with the opening; An oil pan, wherein a partition plate is provided in the oil pan for dividing an inner cavity of the oil pan into a first oil storage area and a second oil storage area, and the partition plate is formed with a communication hole; an oil pump, the oil pump being used to pump the oil in the first oil storage area to the oil inlet passage; The oil collecting component comprises an inlet and an outlet which are connected to each other, wherein the inlet is arranged at the bottom of the opening, and the outlet is arranged at the top of the second oil storage area.

2. The piston cooling system according to claim 1, characterized in that: The outer surface of the oil pan is provided with a plurality of heat dissipation fins, and the plurality of heat dissipation fins are arranged on a side close to the second oil storage area.

3. The piston cooling system according to claim 1, characterized in that: The second oil storage area is used to be arranged on the windward side of the vehicle.

4. The piston cooling system according to claim 1, characterized in that: The aperture of the oil inlet passage is larger than the aperture of the oil inlet port.

5. The piston cooling system according to claim 1, characterized in that: There are multiple oil inlet passages, and the multiple oil inlet passages are arranged on the cylinder liner at intervals along the vertical direction.

6. The piston cooling system according to claim 1, characterized in that: A gap is formed between the outer side of the piston body and the cylinder sleeve, and the gap is filled with engine oil to form an oil film.

7. The piston cooling system according to any one of claims 1 to 6, characterized in that: A first ring groove is arranged on the outer surface of the top of the piston body. The piston cooling system further comprises a first piston ring, which is clamped in the first ring groove and extends out of the piston body. The first piston ring contacts the inner wall of the cylinder sleeve.

8. The piston cooling system according to claim 7, characterized in that: A second ring groove is also provided on the outer surface of the top of the piston body, and the second ring groove is provided at the bottom of the first ring groove. The piston cooling system also includes a second piston ring, which is clamped in the second ring groove and extends out of the piston body, and the second piston ring contacts the inner wall of the cylinder liner.

9. The piston cooling system according to any one of claims 1 to 6, characterized in that: The oil inlet passage is inclined toward the piston body, and the inner cooling oil jacket includes a first connecting section, a second connecting section and a third connecting section that are connected in sequence. The first connecting section is inclined, and the second connecting section is horizontally arranged. The first connecting section is connected to the oil inlet passage, and the third connecting section is connected to the opening.

10. The piston cooling system according to any one of claims 1 to 6, characterized in that: The piston cooling system further includes a main oil passage, a solenoid valve and an injection oil passage which are connected in sequence. The oil pump is used to pump the oil in the first oil storage area to the main oil passage. The injection oil passage is connected to the oil inlet passage.

11. The piston cooling system according to claim 10, characterized in that: The piston cooling system also includes a first lubrication assembly and a second lubrication assembly, one end of each of the first lubrication assembly and the second lubrication assembly is connected to the main oil channel, the other end of the first lubrication assembly is connected to the first oil storage area, and the other end of the second lubrication assembly is connected to the second oil storage area.

12. A crankcase, characterized in that: It comprises a cylinder block, a cylinder head and a piston cooling system as claimed in any one of claims 1 to 11, wherein the oil pan, the cylinder block and the cylinder head form an inner cavity of the crankcase, and the bottom of the piston body is provided with a cavity interconnected with the openings, and the cavity is interconnected with the inner cavity.

13. A vehicle, characterized in that: A piston cooling system comprising any one of claims 1 to 11 above; or a crankcase according to claim 12 above.

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