CN101749077B - Engine oil cooling structure of internal combustion engine - Google Patents

Abstract

An oil cooling structure for an internal combustion engine, wherein a heat exchanger is arranged outside a crankcase of an internal combustion engine, wherein an oil chamber and an oil pump are arranged inside the crankcase. The crankcase is optionally provided with an oil cooling chamber downstream or upstream of the oil pump, and the oil in the oil chamber is introduced into the oil cooling chamber by the drive of the oil pump. The heat exchanger is provided with a heat exchange body and at least one heat dissipation element, wherein the heat dissipation element is a hollow closed tube with a working fluid inside, and the heat dissipation element passes through the wall of the crankcase and has a heat absorbing end and a heat releasing end. The heat absorbing end is located in the oil cooling chamber to absorb heat from the oil; and the heat releasing end is located in the heat exchange body to conduct heat energy to the heat exchange body.

Description

Oil Cooling Structure for Internal Combustion Engines

【Technical field】

The invention relates to an engine oil cooling structure of an internal combustion engine, in particular to an engine oil cooling structure of an internal combustion engine which uses a heat dissipation element to exchange heat with the engine oil inside the internal combustion engine.

【Background technique】

Nowadays, the internal combustion engine (engine) of a general scooter motorcycle will use engine oil to lubricate the surface of the piston, camshaft and inner wall of the cylinder inside the internal combustion engine to provide mutual lubrication between the components to reduce the friction between the components. friction and wear rate, thereby prolonging the service life of the internal combustion engine. If the working temperature of the internal combustion engine is too high, the volume of the components will become larger, the gap between the components will become smaller, and the viscosity of the oil will decrease, which will increase the friction and loss between the components, and cause higher temperatures due to friction, and finally Damage to the internal combustion engine due to overheating. Therefore, during the operation of the internal combustion engine, it is necessary to continuously dissipate the heat energy generated by it to ensure normal operation. At present, the existing engine oil cooling structures of internal combustion engines can be roughly divided into water-cooled, air-cooled, and oil-cooled cooling systems, which are mostly attached to the casing of the internal combustion engine to exchange heat for the engine oil exported from the internal combustion engine. To achieve the purpose of cooling the engine oil.

For example, China Taiwan Announcement No. M268213 New Patent discloses a configuration structure of a scooter motorcycle oil cooler, which is to arrange a water-cooled oil cooler at the front end of the transmission box on the side of the crankcase of an internal combustion engine . The engine oil cooler has a water inlet pipe and an outlet pipe connected to a water pump, so as to input cooling water and output cooling water after absorbing heat. The engine oil cooler also has an engine oil inlet and an engine oil outlet communicated with the crankcase through a pipeline, so as to input the engine oil to be radiated and output the cooled engine oil. In this way, the engine oil cooler can provide a water-cooled cooling system to achieve the purpose of cooling the engine oil.

Furthermore, China Taiwan Announcement No. 417727 new patent discloses a kind of engine oil cooling device, which is to install an engine oil cooling device on the outside of a crankcase, and utilize two conduits to connect each other between the two, by means of a machine in the crankcase The oil pump transports the oil to the oil cooling device through one of the conduits. The oil cooling device uses a cooling channel and several heat dissipation fins to perform air-cooled heat dissipation on the oil, and then uses a filter to filter the oil, and then The cooled and filtered engine oil is led back to an oil passage of the crankcase through another oil conduit to lubricate the internal components of the crankcase. In this way, the engine oil cooling device can provide an air-cooled cooling system to achieve the purpose of cooling the engine oil.

However, the above-mentioned water-cooled or air-cooled cooling system still has the following problems in actual use, for example: in the water-cooled or air-cooled cooling system, a large amount of heat energy of the oil is taken away by cooling water or air, which is Heat exchange is based on the principles of heat conduction and heat convection, but limited by the specific heat of water or air, its heat exchange efficiency is actually still limited. In the design of some cooling systems, heat exchange efficiency can be improved by increasing the volume of the heat exchanger, increasing the number of cooling fins, increasing the flow rate of cooling water, or adding fans to accelerate air convection. However, there may be negative effects such as taking up too much assembly space or consuming too much power. Furthermore, the above-mentioned water-cooled or air-cooled cooling systems all need to export the engine oil to an external heat exchanger through pipelines for heat exchange. However, this configuration will cause a lot of engine oil to temporarily leave the crankcase, relatively reducing the amount of effective engine oil that can be used for lubrication or heat absorption in the crankcase, and therefore will affect the running performance of the internal combustion engine to a certain extent.

Therefore, it is necessary to provide an engine oil cooling structure for an internal combustion engine to solve the problems existing in the prior art.

【Content of invention】

The main purpose of the present invention is to provide an engine oil cooling structure for an internal combustion engine, which uses a cooling element with a working fluid inside to directly absorb heat from the engine oil in the crankcase, and conducts the heat energy to a heat exchanger outside the crankcase. Heat dissipation, thereby greatly improving heat exchange efficiency.

The secondary object of the present invention is to provide an engine oil cooling structure of an internal combustion engine, which is to set an oil cooling chamber downstream or upstream of the oil pump in the crankcase, and to arrange the heat-absorbing end of the heat dissipation element in the oil cooling chamber, so as to Ensure that all the oil can circulate for heat dissipation, thereby improving the cooling efficiency of the oil.

Another object of the present invention is to provide an engine oil cooling structure for an internal combustion engine, which utilizes a very small heat dissipation element as a heat dissipation element, which is sufficient to quickly dissipate heat to all the oil in the crankcase without adding additional heat exchangers The overall volume is relatively conducive to the miniaturization of the heat exchanger.

Another object of the present invention is to provide an engine oil cooling structure for an internal combustion engine, which utilizes heat dissipation elements to conduct heat energy in the crankcase to the outside of the crankcase, without sending any engine oil to the outside of the crankcase, so that the engine oil is completely retained in the crankshaft The inside of the box is used for lubrication and heat absorption, thereby relatively improving the operation performance of the internal combustion engine, and at the same time, it can greatly reduce the amount of oil exchange required for maintenance, simplify the overall structure of the internal combustion engine, and reduce the overall weight and manufacturing cost of the internal combustion engine.

Yet another object of the present invention is to provide an engine oil cooling structure for an internal combustion engine, which is to ensure that the heat-absorbing end of the heat-dissipating element can be used to absorb all the heat energy of the machine oil flowing through by bending the heat-dissipating element or setting a partition plate, and then Improve heat absorption efficiency.

For reaching above-mentioned object, the present invention provides a kind of engine oil cooling structure of internal combustion engine, and it is to arrange a heat exchanger outside a crankcase of an internal combustion engine, and this crankcase is provided with an engine oil chamber and an engine oil pump, and the engine oil of this internal combustion engine The cooling structure is characterized in that: the crankcase is selected to configure an oil cooling chamber downstream or upstream of the oil pump, and the oil in the oil chamber is driven into the oil cooling chamber by the oil pump; the heat exchanger is provided with a The heat exchange body and at least one heat dissipation element, the heat dissipation element is a hollow closed tube with working liquid inside, the heat dissipation element penetrates the wall surface of the crankcase, and has a heat absorption end and a heat release end, the heat absorption end is located at the The engine oil cooling chamber is used to absorb heat from the engine oil; and the heat release end is located in the heat exchange body to conduct heat energy to the heat exchange body.

Preferably, in the oil cooling structure of the internal combustion engine of the present invention, the oil cooling chamber has an oil inlet and an oil outlet, the oil inlet is connected to the oil pump, and the oil outlet is connected to a lubricating oil circuit of the internal combustion engine.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, the lubricating oil passage is further connected to an oil filtering device.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, an oil filter device is additionally provided on the upstream side of the engine oil pump.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, the oil cooling chamber has an oil inlet and an oil outlet, the oil inlet is connected to the oil chamber, and the oil outlet is connected to the oil pump and a lubrication of the internal combustion engine. oil circuit.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, the lubricating oil passage is further connected to an oil filtering device.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, the engine oil inlet of the engine oil cooling chamber is further connected to an oil filtering device.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, the heat exchange body of the heat exchanger further has a cooling channel, and the cooling channel is connected to a water pump through a pipeline.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, the heat exchanging body of the heat exchanger further has several cooling fins.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, there is a shortest flow path between the oil inlet and the oil outlet of the oil cooling chamber, and the heat absorbing end of the cooling element extends to the shortest flow path.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, at least one partition is further provided between the oil inlet and the oil outlet of the oil cooling chamber.

Preferably, in the engine oil cooling structure of the internal combustion engine of the present invention, the working fluid is selected from liquids that can form two-phase changes of vapor phase and liquid phase between the highest temperature and the lowest temperature that the engine oil can withstand.

As mentioned above, compared with the water-cooled or air-cooled cooling system with the oil cooling structure of the existing internal combustion engine, it only uses heat conduction or heat convection to dissipate heat, which leads to problems such as the inability to take into account the miniaturization of the volume and the improvement of heat exchange efficiency. The present invention By setting the engine oil cooling chamber downstream or upstream of the oil pump in the crankcase, and using the cooling element with the working fluid inside, the oil in the oil cooling chamber can directly absorb heat and conduct the heat energy to the heat exchanger outside the crankcase to dissipate heat, thereby greatly improving heat exchange efficiency. The setting of the engine oil cooling room can ensure that all the engine oil circulates to dissipate heat, thereby improving the efficiency of engine oil cooling. Due to the small size of the cooling element, it is enough to quickly dissipate heat from all the oil in the crankcase by using the latent heat principle of the two-phase change, without additionally increasing the entire volume of the heat exchanger, which is beneficial to the heat exchanger. miniaturization. Furthermore, the present invention utilizes the heat dissipation element to conduct the heat energy in the crankcase to the outside of the crankcase, and does not need to transport any engine oil to the outside of the crankcase through any additional delivery pipe, so that the engine oil is completely retained in the crankcase It is used for lubrication and heat absorption, thereby relatively improving the operation performance of the internal combustion engine, and can also greatly reduce the amount of oil exchange required for maintenance, simplify the overall structure of the internal combustion engine, and reduce the overall weight and manufacturing cost of the internal combustion engine. In addition, the present invention can also ensure that the heat-absorbing end of the heat-dissipating element can be used to absorb all the heat energy of the oil flowing through it by bending the heat-absorbing end of the heat-dissipating element or installing the partition plate, which is conducive to improving its heat-absorbing efficiency.

【Description of drawings】

Fig. 1: A combined sectional view of an engine oil cooling structure of an internal combustion engine according to a first embodiment of the present invention.

Fig. 2: A schematic top view of the engine oil cooling structure of the internal combustion engine according to the first embodiment of the present invention.

FIG. 2A is a schematic diagram of the heat dissipation principle of the heat dissipation element of the first embodiment of the present invention.

Fig. 3: A schematic top view of an engine oil cooling structure of an internal combustion engine according to a second embodiment of the present invention.

Fig. 4: A schematic top view of an engine oil cooling structure of an internal combustion engine according to a third embodiment of the present invention.

Fig. 5: A schematic top view of an engine oil cooling structure of an internal combustion engine according to a fourth embodiment of the present invention.

10 Internal Combustion Engine 11 Crankcase

12 Oil room 13 Oil pump room

131 Suction port 132 Supply port

133 Oil pump 14 Oil cooling room

141 Engine oil inlet 142 Engine oil outlet

143 Separator 15 Lubricating oil circuit

16 Oil filter device 20 Heat exchanger

21 Heat exchange body 22 Heat dissipation element

221 Heat-absorbing end 222 Heat-releasing end

223 capillary wall 224 hollow channel

225 Working fluid 23 Cooling channel

24 Cooling fins 30 Water pump

31 pipeline

【Detailed ways】

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments of the present invention will be exemplified below, together with the accompanying drawings, and described in detail as follows.

Please refer to Figures 1 and 2, the engine oil cooling structure of the internal combustion engine of the first embodiment of the present invention is mainly applicable to any type of vehicle with an internal combustion engine, such as a motorcycle with a four-stroke engine, a tricycle with an engine or Motor vehicles such as beach buggies, or can also be applied to automobiles, but is not limited thereto. The engine oil cooling structure of the internal combustion engine in the first embodiment of the present invention is mainly to arrange a heat exchanger 20 outside a crankcase of an internal combustion engine 10, and the present invention will describe its structure in detail below.

Please refer to Fig. 1, shown in 2 again, the internal combustion engine 10 of the first embodiment of the present invention refers to the power source used to drive the motor vehicle to move, and it usually has a crankcase 11, and this crankcase 11 is made of metal or plastics etc. The hollow casing made of plastic has many common existing components inside, such as camshafts and pistons (not shown), etc., and these components are lubricated by engine oil to reduce friction and loss. In this embodiment, the inner bottom of the crankcase 11 has an oil chamber 12 (or called an oil pan area), and the oil in the crankcase 11 is usually collected in the oil chamber 12 due to the action of gravity. 11. For the engine oil chamber 12 and related components, reference may be made to the relevant technology disclosed in the new patent No. M338913 "Crankcase Structure of Engine" in Taiwan, China, which was approved by the applicant in this case. In this embodiment, the crankcase 11 is further provided with an oil pump chamber 13 and an oil cooling chamber 14 at or adjacent to the oil chamber 12 . The oil pump chamber 13 and the oil cooling chamber 14 are adjacently arranged but separated by an inner wall (not marked) of the crankcase 12. In addition, the oil pump chamber 13 and the oil cooling chamber 14 can also be located in the crankcase 12 on the same side, their relative positions or communication methods are not intended to limit the present invention.

Please refer to Fig. 1, shown in 2 again, the engine oil pump chamber 13 of the first embodiment of the present invention has a suction port 131, a supply port 132 and an oil pump 133; The suction port 131 is communicated with this engine oil chamber 12; The port 132 communicates with the oil cooling chamber 14 ; and the oil pump 133 is located in the oil pump chamber 13 and used to draw the oil from the suction port 131 into the oil cooling chamber 14 through the supply port 132 . Furthermore, the oil cooling chamber 14 has an oil inlet 141 and an oil outlet 142; the oil inlet 141 is connected to the supply port 132 of the oil pump chamber 13, and the oil outlet 142 is connected to the crankcase 11 of the internal combustion engine 10 A lubricating oil circuit 15. The lubricating oil passage 15 is preferably further connected to an oil filter device 16 outside the crankcase 11, so as to filter the machine oil flowing through.

Referring to FIGS. 1 , 2 and 2A , the heat exchanger 20 according to the first embodiment of the present invention includes a heat exchanging body 21 , at least one cooling element 22 and at least one cooling channel 23 . The heat exchange body 21 is made of high thermal conductivity metal or alloy material such as aluminum, copper or stainless steel, as a medium for heat conduction. The cooling element 22 is a hollow closed tube with two ends respectively a heat absorbing end 221 and a heat releasing end 222 , and the inside of the cooling element 22 has a capillary wall 223 (wick) and a hollow channel 224 . In this embodiment, the number of the heat dissipation elements 22 is three, but the present invention does not limit the number of the heat dissipation elements 22 . The cooling element 22 penetrates the wall of the crankcase 11 , the heat absorbing end 221 extends into the oil cooling chamber 14 , and the heat releasing end 222 extends into the heat exchange body 21 . The cooling element 22 also has at least one working liquid 225, which can form a two-phase change of vapor phase and liquid phase between the maximum value and the minimum value of the preset operating temperature, so that when it evaporates or condenses The latent heat absorbed or released achieves the purpose of heat dissipation. In the present invention, the working fluid 225 is selected from liquids that can form a two-phase change of vapor phase and liquid phase between the highest temperature and the lowest temperature that the oil can withstand, such as water, ethanol, methanol or acetone, etc. But it is not limited to this. For example, when designing the internal combustion engine 10 of a vehicle, the type of engine oil used in the internal combustion engine 10 varies according to the region where the vehicle is used (such as polar regions or deserts), and at the same time, the appropriate working fluid 225 is selected according to the type of engine oil. When designing, the above-mentioned working liquid 225 can be selected to use only a single type or use multiple types at the same time. Furthermore, the cooling channel 23 is formed through the heat exchange body 21 , and the cooling channel 23 is connected to a water pump 30 through two pipelines 31 for inputting cooling water and outputting high-temperature water. The water tank (not shown) connected to the water pump 30 can cool the water in a suitable manner, for example, a radiator is provided and a fan or natural wind is used to dissipate heat.

Please refer to Fig. 1, 2 and Fig. 2A again, when the engine oil cooling structure of the internal combustion engine of the first embodiment of the present invention is installed in a motor vehicle (not shown) and the motor vehicle is in a driving state, the crankshaft of the internal combustion engine 10 The box 11 generates high temperature due to the operation of components such as the camshaft and the piston (not shown), and the oil in the crankcase 11 can not only provide lubrication, but also absorb the heat energy generated by these components due to friction. Next, the engine oil after absorbing heat energy is collected into the engine oil chamber 12 at the bottom of the crankcase 11 one by one. At this time, the oil pump 133 of the oil pump chamber 13 draws oil through the suction port 131, and delivers the oil to the oil cooling chamber 14 through the supply port 132 and the oil inlet 141 to ensure that all the oil can circulate for heat dissipation. When the oil flows from the oil inlet 141 of the oil cooling chamber 14 to the oil outlet 142 , the heat absorbing end 221 of the cooling element 22 can absorb the heat energy of the oil. For the crankcase 11 of a general motor vehicle, the engine oil after absorbing heat energy can reach about 140°C, which is enough to cause the working fluid 225 in the heat-absorbing end 221 of the cooling element 22 to evaporate from a low-temperature liquid phase to High temperature vapor phase. At this moment, the working liquid 225 in the high temperature vapor phase will move from the hollow channel 224 of the cooling element 22 to the heat release end 222 , and release heat energy at the heat release end 222 to gradually condense into the low temperature liquid phase working liquid 225 . At the same time, the heat energy released by the condensation of the working fluid 225 is conducted to the heat exchange body 21 and absorbed by the water in the cooling channel 23 . Finally, the water liquid after absorbing the heat energy is pumped back to the water tank (not shown) by the pipeline 31 through the water pump 30 to dissipate heat, and after cooling down, circulates back to the cooling channel 23 to absorb heat. In addition, after the engine oil in the engine oil cooling chamber 14 cools down, it is connected to the lubricating oil passage 15 through the engine oil outlet, and after being filtered by the oil filter device 16, the engine oil can flow along the lubricating oil passage 15 to The crankcase 12 is in place to lubricate its internal components. After lubricating the components, the engine oil will flow back to the engine oil chamber 12 at the bottom of the crankcase 11 due to gravity again, and the above-mentioned circulation action of engine oil cooling will be carried out again. Therefore, the heat exchanger 20 of the first embodiment of the present invention can use the two-phase change latent heat absorption/release principle of the working fluid 225 of the heat dissipation element 22 to achieve better results than the simple heat conduction and heat convection principles directly using the heat exchange body 221 The heat exchange efficiency is higher than dozens of times, and at the same time, the cooling water system composed of the cooling channel 23 and other related components is provided to provide a water-cooled heat dissipation function to dissipate heat in real time, ensuring that the heat dissipation element 22 can The working fluid 225 is constantly changing between the liquid phase and the vapor phase, so as to surely take away the heat energy of the engine oil in the crankcase 12 .

Please refer to Fig. 3, the engine oil cooling structure of the internal combustion engine of the second embodiment of the present invention is similar to the first embodiment of the present invention, and the figure number of the first embodiment is used, but the difference between the two is: the first embodiment The heat exchanger 20 of the second embodiment omits the water-cooled heat dissipation structure such as the cooling flow channel 23 and the water pump 30 of the first embodiment, but further changes it to protrude several heat dissipation fins 24 on the surface of the heat exchange body 221 to provide An air-cooled heat dissipation structure is provided. The cooling fins 24 are preferably integrally formed on the heat exchanging body 221 , or may be prefabricated and then assembled on the heat exchanging body 221 in a proper manner, and the manufacturing or assembling methods are not intended to limit the present invention. When the engine oil is cooled down, the working fluid 225 of the heat dissipation element 22 brings heat energy to the heat release end 222 , and the heat energy is then conducted to the heat exchange body 21 and the heat dissipation fins 24 sequentially. In this way, the heat dissipation fins 24 can conduct heat energy to the surrounding air, and directly use the air to dissipate heat. Furthermore, if necessary, a fan or a shroud (not shown) can be used to force the air to dissipate heat from the heat dissipation fins 24, so as to accelerate the efficiency of air-cooled heat dissipation. In addition, compared with the first embodiment, the oil filtering device 16 of the second embodiment is further modified to be arranged at the suction port 131 of the oil pump chamber 13 , that is, arranged at the upstream side of the oil pump 133 . In this way, the filtering action of the passing engine oil can also be performed. In the present invention, according to product design requirements, the position of the oil filter device 16 in the first embodiment can also be changed to the setting method of the second embodiment; similarly, the oil filter device in the second embodiment can also be The position of 16 is changed into the arrangement mode as this first embodiment.

Please refer to Figure 4, the engine oil cooling structure of the internal combustion engine of the third embodiment of the present invention is similar to the first embodiment of the present invention, and the figure number of the first embodiment is used, but the difference between the two is: the first embodiment The third embodiment changes the relative upstream and downstream positions of the oil pump chamber 13 and the oil cooling chamber 14, wherein the oil cooling chamber 14 is located at the upstream of the oil pump chamber 13, and the oil inlet 141 of the oil cooling chamber 14 is connected to the oil chamber 12 , while the oil outlet 142 communicates with the suction port 131 of the oil pump chamber 13 , and then communicates with the lubricating oil passage 15 of the internal combustion engine 10 through the supply port 132 . In this way, the oil pump 133 of the oil pump chamber 13 can also drive the oil from the oil chamber 12 into the oil cooling chamber 14 to ensure that all the oil can circulate for heat dissipation. Moreover, the oil pump 133 and the lubricating oil passage 15 in the oil pump chamber 13 are further connected to the oil filter device 16 to filter the oil flowing through. In addition, compared with the first embodiment, the heat-absorbing end 221 of the heat dissipation element 22 of the third embodiment is bent in an L shape, and its function is: due to the oil inlet 141 and the oil outlet 142 of the oil cooling chamber 14 There is a shortest flow path (not shown), so the oil input from the oil inlet 141 may directly move to the oil outlet 142 through the shortest flow path. Therefore, the heat-absorbing end 221 of the heat dissipation element 22 is further bent and extended to the shortest flow path, so as to ensure the most efficient heat dissipation for all the engine oil flowing through. In addition, in addition to the heat-absorbing end 221, the heat-dissipating end 22 can also be bent in an L shape to increase the contact area with the heat exchanging body 21, so as to improve the conduction of heat energy to the heat exchanging body 21. s efficiency. The heat-absorbing end 221 or the heat-dissipating end 22 can be formed into various suitable bending shapes, such as L-shape, U-shape, wave shape or spiral shape and so on. In the present invention, according to product design requirements, the bending design of the heat-absorbing end 221 (or heat-dissipating end 22) of the heat dissipation element 22 can also be selectively applied to the first or second embodiment, so as to improve the cooling of the engine oil as much as possible. The engine oil cooling effect of chamber 14.

Please refer to Fig. 5, the engine oil cooling structure of the internal combustion engine of the fourth embodiment of the present invention is similar to the third embodiment of the present invention, and the figure number of the third embodiment is used, but the difference between the two is: the first The fourth embodiment omits the water-cooled heat dissipation structures such as the cooling channel 23 and the water pump 30 of the third embodiment, but further changes the surface of the heat exchange body 221 to protrude at least one heat dissipation fin 24 to provide an air-cooled heat dissipation Structure, its heat dissipation principle is the same as the second embodiment of the present invention. In addition, compared with the third embodiment, the oil filtering device 16 of the fourth embodiment is further modified to be arranged at the oil inlet 141 of the oil cooling chamber 14, that is, arranged between the oil cooling chamber 14 and the oil chamber 12. between. In this way, the filtering action of the passing engine oil can also be performed. In addition, the engine oil cooling chamber 14 of the fourth embodiment is additionally provided with at least one partition 143, and its function is that there is a linear shortest flow path ( 2, 3 or 4), so the oil input from the oil inlet 141 may directly move to the oil outlet 142 via the shortest flow path. Therefore, the engine oil cooling chamber 14 can utilize the partition plate 143 to block the original shortest flow path of the straight line, that is, change the flow direction of the engine oil, so that all the engine oil can detour and flow through the heat-absorbing end 221 of the heat dissipation element 22, To ensure the most efficient cooling of all the oil flowing through it. Furthermore, the partition 143 can also be used to increase the structural strength of the oil cooling chamber 14 . In the present invention, according to product design requirements, the barrier design of the partition 143 of the oil cooling chamber 14 can also be selectively applied to the first or second embodiment, so as to improve the oil cooling effect of the oil cooling chamber 14 as much as possible (even The spacer 143 can also be appropriately arranged in accordance with the bent shape of the heat-absorbing end 221 of the heat dissipation element 22 of the third embodiment. In addition, in the third embodiment, the position of the oil filtering device 16 can also be changed to that of the fourth embodiment; similarly, in the fourth embodiment, the position of the oil filtering device 16 can also be changed to that of the fourth embodiment The setting method of the third embodiment.

As mentioned above, compared with the water-cooled or air-cooled cooling system of the existing oil cooling structure of the internal combustion engine, it only uses heat conduction or heat convection to dissipate heat, which leads to problems such as the inability to take into account the miniaturization of the volume and the improvement of heat exchange efficiency, as shown in Figure 1 The present invention shown in FIG. 5 sets the engine oil cooling chamber 14 downstream or upstream of the oil pump 133 in the crankcase 11, and utilizes the cooling element 22 with the working liquid inside to directly cool the engine oil chamber 14. The engine oil inside absorbs heat, and conducts the heat energy to the heat exchanger 20 outside the crankcase 11 to dissipate heat, thereby greatly improving the heat exchange efficiency. The arrangement of the engine oil cooling chamber 14 can ensure that all the engine oil circulates to dissipate heat, thereby improving the efficiency of engine oil cooling. Because the volume of the cooling element 22 is very small, it utilizes the latent heat principle of the two-phase change to dissipate heat rapidly to all the engine oil in the crankcase 11 without additionally increasing the entire volume of the heat exchanger 20, which is beneficial to the Miniaturization of the heat exchanger 20 . Furthermore, the present invention utilizes the heat dissipation element 22 to conduct the heat energy in the crankcase 11 to the outside of the crankcase 11, and does not need to transport any engine oil to the outside of the crankcase 11 through any additional delivery pipe, so that the engine oil is completely retained in the crankcase 11. The crankcase 11 is used for lubrication and heat absorption, thereby relatively improving the running performance of the internal combustion engine 10, and at the same time can greatly reduce the amount of oil exchange required for maintenance, simplify the overall structure of the internal combustion engine, and reduce the overall weight of the internal combustion engine and its manufacturing cost. In addition, the present invention can also ensure that the heat-absorbing end 221 of the heat-dissipating element 22 can be used to absorb all the heat energy of the machine oil flowing through by bending the heat-absorbing end 221 of the heat-dissipating element 22 or setting the partition plate 143, thereby further It is beneficial to improve its heat absorption efficiency.

Although the present invention has been disclosed with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore The scope of protection of the present invention should be defined by the scope of the patent application.

Claims (12)

1. A kind of engine oil cooling structure of internal combustion engine, it is to arrange a heat exchanger outside a crankcase of an internal combustion engine, be provided with an engine oil chamber and an oil pump in this crankcase, the feature of the engine oil cooling structure of this internal combustion engine is: The crankcase is selected to configure an oil cooling chamber downstream or upstream of the oil pump, and the oil in the oil chamber is driven into the oil cooling chamber by the oil pump; the heat exchanger is provided with a heat exchange body and at least one A heat dissipation element, the heat dissipation element is a hollow closed tube with a working fluid inside, the heat dissipation element penetrates the wall of the crankcase, and has a heat-absorbing end and a heat-releasing end, the heat-absorbing end is located in the oil cooling chamber to The engine oil absorbs heat; and the heat releasing end is located in the heat exchanging body to conduct heat energy to the heat exchanging body. 2. The engine oil cooling structure of an internal combustion engine according to claim 1, wherein the oil cooling chamber has an oil inlet and an oil outlet, the oil inlet is connected to the oil pump, and the oil outlet is connected to the internal combustion engine. A lubricating oil circuit. 3. The engine oil cooling structure of an internal combustion engine as claimed in claim 2, wherein the lubricating oil passage is further connected to an oil filtering device. 4. The engine oil cooling structure of an internal combustion engine as claimed in claim 2, wherein an oil filter device is additionally provided on the upstream side of the oil pump. 5. The engine oil cooling structure of an internal combustion engine as claimed in claim 1, wherein the oil cooling chamber has an oil inlet and an oil outlet, the oil inlet is connected to the oil chamber, and the oil outlet is connected to the oil pump And a lubricating oil circuit of the internal combustion engine. 6. The engine oil cooling structure of an internal combustion engine as claimed in claim 5, wherein the lubricating oil passage is further connected to an oil filtering device. 7. The engine oil cooling structure of an internal combustion engine as claimed in claim 5, wherein the oil inlet of the engine oil cooling chamber is further connected to an oil filter device. 8. The engine oil cooling structure of an internal combustion engine as claimed in claim 1, 2 or 5, characterized in that: the heat exchange body of the heat exchanger further has a cooling channel, and the cooling channel is connected to a water pump. 9. The engine oil cooling structure of an internal combustion engine according to claim 1, 2 or 5, characterized in that: the heat exchanging body of the heat exchanger further has several cooling fins. 10. The engine oil cooling structure of an internal combustion engine as claimed in claim 1, 2 or 5, wherein there is a shortest flow path between the oil inlet and the oil outlet of the oil cooling chamber, and the heat-absorbing end of the cooling element is extended to the shortest flow path. 11. The engine oil cooling structure of an internal combustion engine according to claim 1, 2 or 5, characterized in that: at least one partition is provided between the oil inlet and the oil outlet of the oil cooling chamber. 12 . The engine oil cooling structure of an internal combustion engine according to claim 1 , wherein the working fluid is selected from liquids capable of forming a two-phase change between a vapor phase and a liquid phase between the maximum temperature and the minimum temperature that the engine oil can withstand. 13 .

Images