An engine oil cooling structure

Abstract

The present invention provides an engine oil cooling structure, belonging to the technical field of engines. It solves the technical problem that the existing oil cooling structure is not easy to ensure that the low-temperature oil finally flows to the friction pair. In the engine oil cooling structure of the present engine, the engine includes a crankcase, and the crankcase is provided with a columnar oil filter mounting cavity. The cooling structure includes a water channel, the water inlet of the water channel is communicated with a water pump, and there is also a main oil channel in the crankcase. The crankcase is also provided with a heat-conducting thin wall, and the inner cavity of the heat-conducting thin wall forms the oil filter mounting cavity, and the oil filter mounting cavity is communicated with the main oil channel. The water channel is arranged around the outer side wall of the heat-conducting thin wall, and the water outlet of the water channel is communicated with a cooling water channel arranged in the same direction and adjacent to the main oil channel. The engine oil cooling structure of the present engine can save costs under the condition of reducing the oil temperature.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines and relates to an oil cooling structure for an engine. Background Art

[0002] The function of the engine lubrication system is to continuously deliver a sufficient quantity of clean oil at an appropriate temperature to the friction surfaces of all transmission parts during the operation of the engine, and form an oil film between the friction surfaces to achieve liquid friction. Thereby, the frictional resistance is reduced, the power consumption is decreased, and the wear of machine parts is alleviated, so as to improve the working reliability and durability of the engine. During the working process, the oil will become thinner due to excessive temperature, which reduces the lubrication ability. This factor will cause the engine to malfunction due to insufficient lubrication effect. Therefore, an oil cooler is usually provided in the lubricating oil circuit of existing engines.

[0003] The patent with the application publication number CN105697100A discloses an engine with an oil filter cooler, including an engine body, a cooling water channel communicated with the water jacket of the engine body, an oil cooling water tank for accommodating the cooling water from the engine body, an oil filter for filtering the oil in the lubricating oil circuit of the engine body and arranged in the oil cooling water tank, and a control valve for controlling the cooling water to enter the oil cooling water tank from the cooling water channel.

[0004] The above structure cools the oil in the oil filter through the cooling water tank to improve the cooling effect, but the oil flowing out of the filter and into the oil passage will continue to heat up, and it is not easy to ensure that the low-temperature oil finally flows to the friction pair. Summary of the Invention

[0005] In view of the above problems existing in the prior art, the present invention provides an oil cooling structure for an engine. The technical problem to be solved by the present invention is to achieve a better oil cooling effect while saving costs.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] An oil cooling structure for an engine, the engine includes a crankcase, and the crankcase has a columnar oil filter installation cavity. The cooling structure includes a water channel, the water inlet of the water channel is communicated with a water pump, and there is also a main oil passage in the crankcase. It is characterized in that the crankcase also has a heat-conducting thin wall, the inner cavity of the heat-conducting thin wall forms the oil filter installation cavity, the oil filter installation cavity is communicated with the main oil passage, the water channel is arranged around the outer side wall of the heat-conducting thin wall, and the water outlet of the water channel is communicated with a cooling water path arranged adjacent to and in the same direction as the main oil passage.

[0008] The oil filter installation cavity is used to accommodate the oil filter. The oil filter can finely filter the flowing engine oil to prevent impurity particles from flowing to each moving pair along with the engine oil and causing damage. The water channel is connected to the water pump, and the cooling water flowing through the water channel can absorb the heat of the engine oil inside the oil filter installation cavity, thereby reducing the engine oil temperature. The main oil passage is the main channel for the pressurized engine oil to flow to various places after filtration; by setting the oil filter installation cavity to communicate with the main oil passage, the oil filter installation cavity and the water channel are separated by a heat-conducting thin wall, and a cooling water passage connected to the water outlet of the water channel is arranged adjacent to the main oil passage in the same direction. In this way, after the engine oil is initially cooled by the water in the water channel, it can still be continuously cooled by the cooling water passage after entering the main oil passage, which is conducive to regulating the engine oil temperature. Without an additional oil cooler or only a smaller oil cooler needs to be configured, thereby saving costs while reducing the engine oil temperature.

[0009] In the above-mentioned engine oil cooling structure, the outer side wall of the heat-conducting thin wall is provided with heat dissipation fins arranged along the axial direction of the oil filter installation cavity. This is conducive to improving the heat exchange effect between the engine oil in the oil filter installation cavity and the water in the water channel, and further ensuring the engine oil cooling effect.

[0010] In the above-mentioned engine oil cooling structure, one end of the oil filter installation cavity is in an open shape facing outward. This is convenient for users to disassemble and install the oil filter from the outside, improving the maintenance convenience while ensuring the cooling effect.

[0011] In the above-mentioned engine oil cooling structure, the water inlet and water outlet of the water channel are respectively arranged near the two axial ends of the oil filter installation cavity. In this way, the water flowing into the water channel from the water pump can flow fully, and thus can fully absorb the heat dissipated by the engine oil, avoiding the phenomenon of heat accumulation.

[0012] In the above-mentioned engine oil cooling structure, there are multiple heat dissipation fins, which are circumferentially spaced apart around the outer side wall of the heat-conducting thin wall. In this way, the heat dissipation fins can form a diversion for the water in the water channel, enabling the water to flow axially along the side wall of the oil filter installation cavity in multiple orderly strands, thereby ensuring uniform heat exchange of the water and improving the cooling effect.

[0013] In the above-mentioned engine oil cooling structure, the water channel covers the outer surface of the heat-conducting thin wall at the other end of the oil filter installation cavity, and the heat dissipation fins extend to the outer surface of the heat-conducting thin wall at this end. After the engine oil is filtered, it will be discharged from the periphery of the other end of the oil filter installation cavity. In this way, the water in the water channel can further flow around the outer periphery of the discharged engine oil for heat exchange, improving the cooling effect.

[0014] In the above-mentioned engine oil cooling structure, the engine further includes a combustion cylinder block connected to the crankcase, and the main oil passage and the cooling water passage are located in the crankcase and are arranged close to the combustion cylinder block. This is conducive to the design and arrangement of a shorter path for the cooling water passage to communicate with the water jacket of the combustion cylinder block, ensuring sufficient cooling effect.

[0015] In the oil cooling structure of the above engine, the inner wall of the main oil passage has a lubricating oil passage communicating with the rotating pair of the crankshaft. There is a strip-shaped cavity arranged in the same direction as the main oil passage between the middle sections of the main oil passage and the cooling water passage. The position of the lubricating oil passage closest to the oil filter installation cavity along the setting track of the main oil passage is opposite to the position of the cavity. The cavity can reduce the weight of the entire crankcase. In addition, the heat exchange efficiency between the middle section of the cooling water passage and the main oil passage can be appropriately reduced. In this way, the oil in the main oil passage that has been preliminarily cooled will slowly cool down or even gradually warm up. The oil enters the lubricating oil passage at the rotating pair of the crankshaft at a lower temperature. After passing through the cavity area, the oil in the main oil passage can be directly cooled by the cooling water passage again. The oil temperature continues to decrease. Then, when the oil enters another lubricating oil passage, the temperature difference between the oil temperature and the oil temperature entering the first lubricating oil passage can be smaller, ensuring that the oil temperature participating in lubrication is closer and ensuring stable and consistent lubrication effect.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] In the oil cooling structure of this engine, after the oil is preliminarily cooled by the water liquid in the water passage, it can still be continuously cooled by the cooling water passage after entering the main oil passage, which is beneficial to realizing the regulation of the oil temperature. There is no need for an additional oil cooler or only a smaller oil cooler needs to be configured, thereby saving costs under the condition of reducing the oil temperature. Description of the Drawings

[0018] Figure 1 is a three-dimensional structure schematic diagram of the engine in this embodiment.

[0019] Figure 2 is a partial sectional structure schematic diagram of the engine in this embodiment.

[0020] Figure 3 is a partial sectional structure schematic diagram of the engine from another angle in this embodiment.

[0021] Figure 4 is a sectional structure schematic diagram of the engine in this embodiment.

[0022] Figure 5 is a sectional structure schematic diagram of the engine from another angle in this embodiment.

[0023] Figure 6 is a partial three-dimensional structure schematic diagram of the crankcase in this embodiment.

[0024] Figure 7 is a partial three-dimensional structure schematic diagram of the crankcase from another angle in this embodiment.

[0025] In the figure, 1 is the oil filter installation cavity; 2 is the water passage; 21 is the water inlet; 22 is the water outlet; 3 is the water pump.

[0026] 4. Main oil passage; 41. Lubricating oil passage;

[0027] 5. Cooling water passage; 6. Heat sink;

[0028] 7. Crankcase; 71. Heat-conducting thin wall;

[0029] 8. Combustion cylinder block; 9. Cavity. Detailed implementation manners

[0030] The following are specific embodiments of the present invention and, in conjunction with the accompanying drawings, further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0031] Such as Figure 1-7As shown, in the oil cooling structure of the engine, a columnar oil filter installation cavity 1 is provided on the engine, and the cooling structure includes a bypass water channel 2, a water inlet 21 of the water channel 2 is connected to a water pump 3, a main oil channel 4 for conveying oil to various components is provided in the engine, and a heat-conducting thin wall 71 is also provided on the crankcase 7, an inner cavity of the heat-conducting thin wall 71 forms the oil filter installation cavity 1, the water channel 2 is arranged around the outer periphery of the heat-conducting thin wall 71, the oil filter installation cavity 1 is connected to the main oil channel 4, and a water outlet 22 of the water channel 2 is connected to a cooling water channel 5 which is arranged in the same direction and adjacent to the main oil channel 4. The oil filter installation cavity 1 is used to accommodate the oil filter, which can finely filter the oil flowing through it to prevent impurities and particles from flowing to the various moving parts with the oil and causing damage. The water channel 2 is connected to the water pump 3, which is an existing product. The cooling water flowing through the water channel 2 can absorb the heat of the oil inside the oil filter installation cavity 1, thereby reducing the oil temperature. The main oil channel 4 is the main channel for the pressurized oil to flow to various places after filtering. By setting the oil filter installation cavity 1 to be connected to the main oil channel 4, and setting the cooling water channel 5 connected to the water channel 2 to be arranged adjacent to the main oil channel 4 in the same direction, the oil can continue to be cooled by the cooling water channel 5 after the initial cooling of the water in the water channel 2 after entering the main oil channel 4, which is conducive to the regulation of the oil temperature. No additional oil cooler is required or only a smaller oil cooler is required, thereby saving costs while reducing the oil temperature. Specifically, one end of the oil filter installation cavity 1 is open and facing outward. This makes it easy for users to disassemble and install the oil filter from the outside, improving the convenience of maintenance while ensuring the cooling effect. The water inlet 21 and the water outlet 22 of the water channel 2 are arranged close to the axial ends of the oil filter installation cavity 1 respectively. In this way, the water flowing into the water channel 2 from the water pump 3 can flow fully, and then the heat dissipated by the oil can be fully absorbed to avoid the phenomenon of heat accumulation. The engine includes a crankcase 7 and a combustion cylinder 8 connected to the crankcase 7. The main oil channel 4 and the cooling water channel 5 are located in the crankcase 7 and arranged close to the combustion cylinder 8. This is conducive to the design and arrangement of the cooling water channel 5 to connect to the combustion cylinder 8 water jacket with a shorter path, ensuring sufficient cooling effect. The inner wall of the main oil channel 4 has a lubricating oil channel 41 connected to the rotating pair of the crankshaft, and there is a cavity 9 in a strip shape and arranged in the same direction as the main oil channel 4 between the middle sections of the main oil channel 4 and the cooling water channel 5. The position of the lubricating oil channel 41 closest to the oil filter installation cavity 1 along the extension trajectory of the main oil channel 4 is opposite to the position of the cavity 9. The cavity 9 can reduce the heat exchange efficiency between the cooling water channel 5 and the main oil channel 4 in the middle section, so that the engine oil in the main oil channel 4 that has been initially cooled will slowly cool down or even gradually heat up, and the engine oil enters the lubricating oil channel 41 at the first rotating pair of the crankshaft at a lower temperature. The engine oil in the main oil channel 4 can be directly cooled by the cooling water channel 5 after passing through the cavity 9 area, and the engine oil temperature continues to decrease. Then, when the engine oil enters another lubricating oil channel 41, its temperature can have a smaller temperature difference with the engine oil temperature entering the first lubricating oil channel 41, ensuring that the temperature of the engine oil involved in lubrication is closer, and ensuring that the lubrication effect is stable and consistent.

[0032] likeFigure 2 , Figure 3 , Figure 7 As shown in Figure 7 , the outer sidewall of the heat-conducting thin wall 71 is provided with heat dissipation fins 6 arranged axially along the oil filter installation cavity 1. This is beneficial to improving the heat exchange effect between the engine oil in the oil filter installation cavity 1 and the water liquid in the water channel 2, and further ensuring the engine oil cooling effect. There are six heat dissipation fins 6, which are circumferentially spaced around the outer sidewall of the heat-conducting thin wall 71. In this way, the heat dissipation fins 6 can form a diversion for the water liquid in the water channel 2, so that the water liquid flows axially along the sidewall of the oil filter installation cavity 1 in multiple strands in an orderly manner, thereby ensuring uniform heat exchange of the water liquid and improving the cooling effect. The water channel 2 covers the outer surface of the heat-conducting thin wall 71 at the other end of the oil filter installation cavity 1, and the heat dissipation fins 6 extend to the outer surface of this end of the heat-conducting thin wall 71. After the engine oil is filtered, it will be discharged from the periphery at the other end of the oil filter installation cavity 1. In this way, the water liquid in the water channel 2 can further flow around the outer periphery of the discharged engine oil for heat exchange, improving the cooling effect.

[0033] The specific embodiments described in this text are only examples to illustrate the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An oil cooling structure for an engine, the engine includes a crankcase (7), and the crankcase (7) is provided with a columnar engine oil filter mounting cavity (1). The cooling structure includes a water channel (2), the water inlet (21) of the water channel (2) is communicated with a water pump (3), and a main oil channel (4) for conveying engine oil is arranged in the crankcase (7), characterized in that, The crankcase (7) further has a thin heat-conducting wall (71), the inner cavity of the thin heat-conducting wall (71) forms the engine oil filter mounting cavity (1), the engine oil filter mounting cavity (1) communicates with the main oil passage (4), the water passage (2) is arranged around the outer side wall of the thin heat-conducting wall (71), and the water outlet (22) of the water passage (2) communicates with a cooling water passage (5) arranged adjacent to and in the same direction as the main oil passage (4); the water inlet (21) and the water outlet (22) of the water passage (2) are respectively arranged near the axial two ends of the engine oil filter mounting cavity (1), the inner wall of the main oil passage (4) has a lubricating oil passage (41) communicating to the rotating pair of the crankshaft, and there is a cavity (9) in a strip shape and arranged in the same direction as the main oil passage (4) between the middle sections of the main oil passage (4) and the cooling water passage (5), and the position of the lubricating oil passage (41) closest to the engine oil filter mounting cavity (1) along the setting direction of the main oil passage (4) is opposite to the position of the cavity (9).

2. The engine oil cooling structure according to claim 1, characterized in that, The engine further includes a combustion cylinder block (8) connected to the crankcase (7), and the main oil passage (4) and the cooling water passage (5) are located in the crankcase (7) and arranged close to the combustion cylinder block (8).

3. The engine oil cooling structure according to claim 1 or 2, characterized in that, The outer side wall of the thin heat-conducting wall (71) has heat dissipation fins (6) arranged along the axis of the engine oil filter mounting cavity (1).

4. The oil cooling structure of the engine according to claim 3, characterized in that, One end of the engine oil filter mounting cavity (1) is in an open shape facing outwards.

5. The oil cooling structure of the engine according to claim 3, characterized in that, There are a plurality of the heat dissipation fins (6) and they are circumferentially spaced around the outer side wall of the thin heat-conducting wall (71).

6. The engine oil cooling structure according to claim 3, wherein, The water passage (2) covers the outer surface of the thin heat-conducting wall (71) at the other end of the engine oil filter mounting cavity (1), and the heat dissipation fins (6) extend to the outer surface of the thin heat-conducting wall (71) at this end.

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