An engine casing

Abstract

The present application relates to the field of automobile and motorcycle accessories, and in particular to an engine casing, which includes a main casing and an oil pan for storing lubricating oil, wherein the oil pan is fixedly connected to the bottom of the main casing and communicates with the main casing, the interior of the main casing and the interior of the oil pan are used for crank installation, and the inner surface of the oil pan has a plurality of heat collecting sheets. The present application increases the contact area with the lubricating oil by contacting the inner wall of the oil pan and the heat collecting sheets together, so that the heat of the lubricating oil can be transferred to the oil pan through the heat collecting sheets and then dissipated to the outside of the oil pan, thereby reducing the probability of lubrication deterioration and failure.

Description

Technical Field

[0001] The present application relates to the field of automobile and motorcycle accessories, and in particular to an engine casing. Background Art

[0002] When the engine is running, the parts in the engine case need to be lubricated to facilitate stable operation of the engine. The engine oil pan includes a main case and an oil pan. The main case is connected to the oil pan, and the oil pan is located below the main case. The crank is located in both the main case and the oil pan. Lubricating oil is stored in the oil pan. When the crank rotates, the lubricating oil in the oil pan splashes onto various parts in the main case to splash lubricate the engine parts. The lubricating oil after lubrication flows back to the oil pan due to gravity. Since the parts will emit heat when they are in operation, the temperature of the lubricating oil in the oil pan gradually rises. If the lubricating oil temperature is too high, it is easy to deteriorate and fail. Summary of the invention

[0003] In order to reduce the probability of lubricating oil deterioration and failure, the present application provides an engine casing.

[0004] The present application provides an engine casing adopting the following technical solution:

[0005] An engine casing comprises a main casing and an oil pan for storing lubricating oil, wherein the oil pan is fixedly connected to the bottom of the main casing and communicates with the main casing, the interior of the main casing and the interior of the oil pan are used for crank installation, and the inner surface of the oil pan has a plurality of heat collecting fins.

[0006] By adopting the above technical solution, when the crank causes the lubricating oil in the oil pan to splash and lubricate the engine parts, the temperature of the lubricating oil rises. Not only can the inner wall of the oil pan come into contact with the lubricating oil, but the heat collecting plates on the inner surface of the oil pan also increase the contact area with the lubricating oil, so that the heat of the lubricating oil can be transferred to the oil pan through the heat collecting plates and then dissipated to the outside of the oil pan, so as to reduce the temperature of the lubricating oil, thereby reducing the probability of the lubricating oil deteriorating and failing due to excessive temperature.

[0007] Preferably, the heat collecting sheets are parallel to each other, and there is an angle between the heat collecting sheets and the horizontal plane.

[0008] By adopting the above technical solution, when the crank drives the lubricating oil to splash, the lubricating oil spreads around, and by making the collector plates parallel and an angle between the collector plates and the horizontal plane, the crank allows the splashed lubricating oil to splash smoothly upward or around, so that when the splashed lubricating oil flows back to the oil pan due to gravity, the lubricating oil can flow smoothly to the oil pan along the spacing and inclination between the collector plates, so that the liquid level in the oil pan is at a higher position, which is convenient for the crank to drive more lubricating oil to splash, thereby improving the lubrication efficiency.

[0009] Preferably, it also includes a scraper and a sealing plug, the bottom wall of the oil pan is provided with an oil drain hole, and the sealing plug is used to slide into and seal the oil drain hole; the scraper is slidably connected to the oil pan, the length direction of the scraper is perpendicular to the heat collecting plate, and the scraper slides against the inner surface of the oil pan and the heat collecting plate, a tension spring is connected between the oil pan and the scraper, and a transmission wire is connected between the scraper and the sealing plug, and the tension spring and the transmission wire are located on both sides of the scraper; when the sealing plug slides away from the oil drain hole, the scraper slides in a direction close to the bottom wall of the oil pan.

[0010] By adopting the above technical solution, the lubricating oil will bring impurities of the parts into the oil pan during lubrication, and the lubricating oil also needs to be replaced regularly. When replacing the lubricating oil, the lubricating oil needs to be taken out from the oil pan, but when the lubricating oil is taken out, the impurities in the lubricating oil may be left on the inner surface of the oil pan. When the sealing plug slides away from the oil drain hole, the sealing plug causes the scraper to slide through the transmission wire, and the scraper slides against the inner surface of the oil pan and the heat collecting plate, so that the scraper scrapes off the impurities attached to the oil pan and the heat collecting plate, and then the impurities flow out of the oil drain hole through the lubricating oil, so as to clean the inner surface of the oil pan. When the sealing plug slides away from the oil drain hole, the scraper slides in the direction close to the bottom wall of the oil pan, so that the impurities and lubricating oil can flow to the bottom wall of the oil pan faster and be discharged from the oil drain hole. After the oil is drained, the scraper is reset under the action of the tension spring. People can slide the sealing plug back and forth many times to clean the inner surface of the oil pan.

[0011] Preferably, the scraper includes a plate body and a sliding shaft, the sliding shaft is fixedly connected to the plate body, and the axial direction of the sliding shaft is the same as the length direction of the plate body; the plate body is provided with a plurality of scraping grooves distributed along the length direction of the plate body, the scraping grooves are used for the heat collecting plate to be embedded, and the groove walls of the scraping grooves slide against the heat collecting plate, the surface of the plate body provided with the scraping grooves is used to slide against the surface of the oil pan with the heat collecting plate, and there is an angle A greater than 90° between the surface of the oil pan with the heat collecting plate and the bottom wall of the oil pan; the two surfaces of the oil pan along the length direction of the plate body are provided with inclined grooves, there is an angle B between the length direction of the inclined grooves and the bottom wall of the oil pan, and the angle B is equal to the angle A, the two ends of the sliding shaft are respectively slidably embedded in the two inclined grooves, and the sliding direction of the sliding shaft is perpendicular to the axial direction of the sliding shaft.

[0012] By adopting the above technical solution, the groove wall of the scraping groove slides against the heat collecting sheet, which not only enables the impurities on the surface of the heat collecting sheet to be scraped off when the plate body slides, but also limits the movement of the plate body along its own length direction through the groove wall of the scraping groove to improve the sliding stability of the plate body. The sliding shaft is slidably embedded in the inclined groove, the angle A is equal to the angle B, and the surface of the plate body provided with the scraping groove is used to slide against the inner surface of the oil pan. Since the angle A is greater than 90°, the inner surface of the oil pan and the groove wall of the inclined groove respectively support the plate body and the sliding shaft. At the same time, the inclined groove guides the sliding of the sliding shaft to improve the sliding stability of the plate body, and facilitates the oil pan lubricating oil to splash into the main shell to improve the lubrication efficiency.

[0013] Preferably, the tension spring is connected between the oil pan and the plate body, and the transmission wire is connected between the plate body and the sealing plug; the side of the plate body provided with the scraping groove is higher than the side of the plate body facing away from the scraping groove, and the sliding shaft is fixedly connected to the side of the plate body facing away from the scraping groove; the distance from one end of the transmission wire connected to the plate body to the scraping groove notch is smaller than the distance from one end of the transmission wire connected to the plate body to the sliding shaft; the end of the tension spring connected to the plate body is located between the scraping groove notch and the transmission wire.

[0014] By adopting the above technical solution, when the transmission wire causes the plate body to slide in the direction away from the tension spring, the plate body slides against the inner surface of the oil pan connected with the heat collecting plate, and the inner surface of the oil pan has an inclination, and the groove wall of the inclined groove and the inner surface of the oil pan are used to abut the plate body, so that the plate body can scrape off the impurities on the inner surface of the oil pan as much as possible. When the plate body moves in the direction close to the main shell under the action of the tension spring, the tension spring is close to the notch of the scraping groove, and there is friction between the sliding shaft and the inclined groove, and between the plate body and the heat collecting plate, so that the plate body abutting against the inner surface of the oil pan will rotate around the axis of the sliding shaft and cause the plate body to separate from the inner wall of the oil pan, and then the elastic force of the tension spring causes the plate body to slide and reset in the direction close to the tension spring. Thereby, the probability that the impurities on the inner surface of the oil pan that have not been scraped clean are scraped away from the oil drain hole by the plate body is reduced, so as to improve the cleaning efficiency.

[0015] Preferably, both ends of the sliding shaft are sleeved with rubber rings, and the inner circumference and outer circumference of the rubber ring are respectively pressed against the sliding shaft and the groove wall of the inclined groove.

[0016] By adopting the above technical solution, the rubber ring presses against the sliding shaft and the groove wall of the inclined groove, so that the friction between the rubber ring and the groove wall of the inclined groove is increased. When people slide the sealing plug to disengage from the oil drain hole, the transmission wire drives the plate body to move in the direction away from the tension spring. The friction between the rubber ring and the groove wall of the inclined groove prevents the sliding shaft from sliding, and the plate body that does not abut against the inner surface of the oil pan is rotated around the axis of the sliding shaft until it abuts against the inner surface of the oil pan through the transmission wire. Then the sealing plug continues to slide to make the plate body and the sliding shaft slide along the inclined groove, and the plate body slides to scrape the inner surface of the oil pan, so that people can reciprocate to clean the surface of the oil pan, thereby improving the cleaning efficiency.

[0017] Preferably, there are multiple transmission wires, the ends of the transmission wires connected to the plate body are evenly spaced along the length direction of the scraper, the bottom wall of the oil pan is fixedly connected with multiple guide blocks, and the number of the guide blocks is equal to the number of transmission wires, the guide blocks are provided with through holes for the transmission wires to pass through, and the transmission wires between the guide blocks and the scrapers are parallel to each other.

[0018] By adopting the above technical solution, multiple transmission wires directly apply force to the scraper, and the force application directions of the multiple transmission wires are parallel, so as to reduce the probability of generating a large extrusion force between the scraper and the heat collecting plate, thereby reducing the probability of increasing the friction between the scraper and the heat collecting plate, so that people can drive the scraper to slide through the transmission wires and improve the sliding stability of the scraper.

[0019] Preferably, a fillet is provided between the inner peripheral surface of the oil drain hole and the inner surface of the oil pan.

[0020] By adopting the above technical solution, the probability of the transmission wire being worn by edges and corners is reduced, thereby increasing the service life of the transmission wire.

[0021] Preferably, the tension spring is provided with a pre-tightening force which causes the scraper to slide in a direction away from the bottom wall of the oil pan.

[0022] By adopting the above technical solution, the tension spring can make the sealing plug stably embedded in the oil drain hole through the transmission wire, so as to improve the stability of the sealing plug, thereby reducing the probability of oil leakage from the oil drain hole, and at the same time reducing the probability of air outside the oil pan entering the oil pan, so as to reduce the probability of impurities in the air causing the lubricating oil to deteriorate and fail.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The inner surface of the oil pan and the heat collecting sheet are in contact with the lubricating oil to increase the contact area with the lubricating oil, so that the heat of the lubricating oil can be transferred to the oil pan through the heat collecting sheet and then dissipated to the outside of the oil pan, thereby reducing the probability of lubrication failure;

[0025] 2. A transmission wire is arranged between the sealing plug and the scraper, so that people can clean the inner surface of the oil pan and the heat collecting sheet when opening the sealing plug. A tension spring is arranged between the scraper and the main shell so that the scraper can be reset, thereby facilitating people to reciprocate and clean the inner surface of the oil pan and the heat collecting sheet;

[0026] 3. The arrangement of multiple transmission wires and inclined grooves can improve the sliding stability of the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the structure of the oil pan in the embodiment of the present application.

[0029] Figure 3 It is a cross-sectional view of an embodiment of the present application, mainly used to show the scraper and the inclined groove.

[0030] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0031] Figure 5 It is a cross-sectional view of the oil pan in the embodiment of the present application.

[0032] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0033] Figure 7 It is a cross-sectional structural schematic diagram of an embodiment of the present application, which is mainly used to show the state of the plate body when it slides toward the bottom surface of the oil pan.

[0034] Figure 8 It is a fracture view of an embodiment of the present application, mainly used to show the state of the plate body sliding away from the bottom surface of the oil pan.

[0035] Explanation of the reference numerals: 1. main shell; 2. oil pan; 21. bottom surface; 211. oil drain hole; 212. fillet; 22. side plane; 221. inclined groove; 23. side inclined surface; 24. connecting surface; 25. guide block; 251. guide hole; 26. collecting block; 261. collecting hole; 3. sealing plug; 31. plug body; 32. baffle; 33. sealing sleeve; 4. scraper; 41. plate body; 411. scraper groove; 412. retaining ring; 42. sliding shaft; 5. collector; 6. rubber ring; 7. transmission wire; 8. tension spring. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-8 This application is described in further detail.

[0037] Reference Figure 1 and Figure 2 The embodiment of the present application discloses an engine casing, including a main casing 1, an oil pan 2 and two scrapers 4, the main casing 1, the oil pan 2 and the scrapers 4 are all formed by aluminum hydraulic casting. The main casing 1 is fixedly connected to the top of the oil pan 2, and the oil pan 2 and the main casing 1 are connected. The oil pan 2 is used to place lubricating oil, and the oil pan 2 and the main casing 1 are used together for the installation of the crank. When the crank rotates into the oil pan 2, the lubricating oil in the oil pan 2 is driven to splash into the main casing 1 to lubricate the parts in the main casing 1.

[0038] Reference Figure 2 The inner surface of the oil pan 2 includes a bottom surface 21, two opposite and parallel side planes 22 and two opposite side slopes 23. The bottom surface 21 is rectangular, and the two side slopes 23 are located on both sides of the length direction of the bottom surface 21, and the two side planes 22 are located on both sides of the width direction of the bottom surface 21. The two side slopes 23 are integrally formed with a plurality of heat collecting plates 5, and the heat collecting plates 5 are parallel to each other and perpendicular to the horizontal plane, and the number of heat collecting plates 5 on any side slope 23 is the same. In this embodiment, there are six heat collecting plates 5 on any side slope 23, and in other embodiments, there may be seven or eight heat collecting plates 5 on any side slope 23. The two side slopes 23 are inclined in a direction away from each other, so that the angle A between the side slope 23 and the bottom surface 21 is greater than 90°, so that the lubricating oil in the oil pan 2 can splash into the main shell 1 to lubricate the parts.

[0039] The two side planes 22 are parallel to each other. The side plane 22 is provided with an inclined groove 221 . The angle B between the length direction of the inclined groove 221 and the bottom surface 21 is equal to the angle A. The upper end of the inclined groove 221 is lower than the upper end of the side slope 23 .

[0040] Reference Figure 3 and Figure 4 The scraper 4 includes a plate body 41 and a sliding shaft 42. The plate body 41 is similar to a rectangular parallelepiped, and the length direction of the plate body 41 is perpendicular to the heat collecting sheet 5. The plate body 41 is located in the oil pan 2, and the plate body 41 is tilted. The side of the plate body 41 close to the side slope 23 is higher than the side of the plate body 41 away from the side slope 23. A plurality of scraping grooves 411 are provided on the surface of the plate body 41 close to the side slope 23. All scraping grooves 411 are evenly spaced along the length direction of the plate body 41, and the number of scraping grooves 411 is equal to the number of heat collecting sheets 5. The surface of the plate body 41 away from the scraping groove 411 is integrally formed with a sliding shaft 42. The length of the sliding shaft 42 is greater than the length of the plate body 41, and the two ends of the sliding shaft 42 along its own axial direction protrude from the two ends of the plate body 41. The outer periphery of both ends of the sliding shaft 42 is sleeved with rubber rings 6.

[0041] Both ends of the sliding shaft 42 are respectively embedded in the inclined grooves 221 provided on the two side planes 22, and the sliding shaft 42 slides along the length direction of the inclined groove 221 and is perpendicular to the heat collecting plate 5, and the inner and outer circumferences of the rubber ring 6 are respectively pressed against the sliding shaft 42 and the groove wall of the inclined groove 221.

[0042] The distance between the side slope 23 and the inclined groove 221 is smaller than the distance between the notch of the scraping groove 411 and the sliding shaft 42, and because the angle A is equal to the angle B and is greater than 90°, the surface of the plate body 41 with the scraping groove 411 will abut against the surface of the oil pan 2 with the heat collecting plate 5 due to its own gravity.

[0043] Reference Figure 5 and Figure 6 An engine casing also includes a sealing plug 3, a drain hole 211 is provided at the central position of the bottom surface 21, a fillet 212 is provided between the bottom surface 21 and the inner circumference of the drain hole 211, and the drain hole 211 passes through the oil pan 2 along its own axial direction. The sealing plug 3 includes a plug body 31, a baffle 32 and a sealing sleeve 33. The plug body 31 and the baffle 32 are both cylindrical, but the diameter of the baffle 32 is larger than the diameter of the plug body 31. The baffle 32 is coaxially fixedly connected to one end of the plug body 31 in the axial direction, and the sealing sleeve 33 is coaxially fixedly sleeved on the outer periphery of the plug body 31. The plug body 31 and the sealing sleeve 33 are used to be slidably embedded in the drain hole 211, and the inner periphery and outer periphery of the sealing sleeve 33 are respectively pressed against the outer periphery of the plug body 31 and the inner periphery of the drain hole 211, so as to improve the sealing between the plug body 31 and the drain hole 211. The surface of the baffle 32 facing the plug body 31 is used to abut against the outer wall of the oil pan 2 to prevent the plug body 31 from excessively sliding into the oil pan 2 .

[0044] The plug body 31 and the plate body 41 are connected by a transmission wire 7, and the plate body 41 and the oil pan 2 are connected by a tension spring 8, so that the sliding of the plug body 31 drives the plate body 41 to slide and causes the tension spring 8 to undergo elastic deformation. Specifically, a collecting block 26 and three guide blocks 25 are fixedly connected to the bottom surface 21 between the oil drain hole 211 and the side slope 23. The collecting block 26 is close to the oil drain hole 211, and the guide block 25 is close to the side slope 23, and the three guide blocks 25 are evenly spaced along the width direction of the bottom surface 21. The collecting block 26 is provided with a collecting hole 261 along the length direction of the bottom surface 21, and the guide block 25 is provided with a guide hole 251 along the length direction of the bottom surface 21. Three transmission wires 7 are fixedly connected to the surface of each plate body 41 close to the bottom surface 21, and one end of the three transmission wires 7 first passes through the three guide holes 251 respectively, and then passes through the collecting hole 261 together and is fixedly connected to the end of the plug body 31 away from the baffle 32. The transmission wires 7 between the guide block 25 and the plate body 41 are parallel to each other, so that when the plug body 31 slides, the transmission wires 7 can make the plate body 41 as a whole slide as close to the bottom surface 21 as possible, thereby reducing the probability of the plate body 41 being pulled by multiple transmission wires 7 and causing excessive displacement between the plate body 41 and the heat collecting plate 5.

[0045] Reference Figure 5 , three snap rings 412 are fixedly connected to the surface of each plate body 41 away from the bottom surface 21, and the three snap rings 412 are evenly spaced along the length direction of the plate body 41, and the distance between adjacent snap rings 412 is equal to the distance between adjacent guide blocks 25. The inner surface of the oil pan 2 also includes two connecting surfaces 24, and the connecting surfaces 24 are located above the side inclined surface 23 and between the two side planes 22. Three snap rings 412 are fixedly connected to each connecting surface 24, and hooks are integrally formed at both ends of the tension spring 8 along its own axial direction, and the number of the tension springs 8 is equal to the number of the transmission wires 7. The hooks at both ends of the tension spring 8 along its own axial direction are respectively connected to the retaining ring 412 on the connecting surface 24 and the retaining ring 412 on the plate body 41. The tension spring 8 makes the axial direction of the tension spring 8 vertical based on its own gravity. However, since there is an angle between the sliding direction of the plate body 41 and the vertical direction, the hook of the tension spring 8 and the retaining ring 412 are matched to achieve that when the plate body 41 slides, the axial direction of the tension spring 8 can be axially offset along the pulling direction of the plate body 41 on the tension spring 8, thereby realizing the connection between the oil pan 2 and the plate body 41.

[0046] Reference Figure 2 and Figure 5When the plug body 31 is embedded in the oil drain hole 211 and the baffle plate 32 abuts against the outer wall of the oil pan 2, the rubber ring 6 sleeved on the outer periphery of the sliding shaft 42 abuts against the groove wall of the inclined groove 221 in the length direction and close to the upper side; at this time, the tension spring 8 is in a stretched state, so that a pre-tightening force is set on the tension spring 8, so that the plate body 41 has a tendency to slide in a direction away from the bottom surface 21 of the oil pan 2, so that the baffle plate 32 abuts against the outer wall of the oil pan 2, so that the plug body 31 can be more stably embedded in the oil drain hole 211.

[0047] When the plug body 31 slides away from the oil drain hole 211 , the plug body 31 drives the plate body 41 through the transmission wire 7 to clean the surface of the oil pan 2 and the heat collecting plate 5 , and causes the tension spring 8 to undergo elastic deformation.

[0048] Reference Figure 7 and Figure 8 The distance from one end of the transmission wire 7 connected to the plate body 41 to the notch of the scraper groove 411 is smaller than the distance from one end of the transmission wire 7 connected to the plate body 41 to the sliding shaft 42, and the tension spring 8 is matched with the retaining ring 412 to connect one end of the plate body 41 and is located between the notch of the scraper groove 411 and the transmission wire 7, so that the tension spring 8 that undergoes elastic deformation makes the plate body 41 reset. Due to the friction between the rubber ring 6 on the outer periphery of the sliding shaft 42 and the inclined groove 221, the tension spring 8 makes the surface of the plate body 41 provided with the scraper groove 411 rotate around the axis of the sliding shaft 42 and disengage from the side inclined surface 23 of the oil pan 2, so as to reduce the probability of scraping impurities on the side inclined surface 23 of the oil pan 2 when the plate body 41 is reset. After the plate body 41 is reset, the surface of the plate body 41 with the scraping groove 411 is still separated from the side inclined surface 23 of the oil pan 2. The baffle plate 32 continues to slide so that when the transmission wire 7 pulls the plate body 41, due to the increased friction between the rubber ring 6 on the outer periphery of the sliding shaft 42 and the groove wall of the inclined groove 221, the surface of the plate body 41 with the scraping groove 411 will rotate around the axis of the sliding shaft 42 until it abuts against the side inclined surface 23 of the oil pan 2, and then slide towards the direction close to the bottom surface 21 of the oil pan 2 as the transmission wire 7 is pulled, and impurities on the side inclined surface 23 of the oil pan 2 and the surface of the heat collecting plate 5 are cleaned.

[0049] The implementation principle of an engine casing of the embodiment of the present application is as follows: by arranging a plurality of heat collecting sheets 5 on the inner wall of the oil pan 2 to increase the contact area of ​​the lubricating oil inside the oil pan 2, the efficiency of transferring the lubricating temperature to the oil pan 2 and dissipating it to the outside of the oil pan 2 is improved, so that the temperature of the lubricating oil is reduced to reduce the probability of the lubricating oil deteriorating and failing. Moreover, when replacing the lubricating oil, the plug body 31 can be slid and the plate body 41 can be slid through the transmission wire 7 to clean the heat collecting sheets 5 and the scraper 4. After cleaning, since one end of the tension spring 8 connected to the plate body 41 is located between the notch of the scraping groove 411 and the snap ring 412, the surface of the plate body 41 provided with the scraping groove 411 can be separated from the side inclined surface 23 of the oil pan 2, so as to reduce the probability that the plate body 41 causes the impurities on the side inclined surface 23 of the oil pan 2 to slide away from the oil drain port, thereby improving the cleaning efficiency.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An engine casing, comprising a main casing (1) and an oil pan (2) for storing lubricating oil, wherein the oil pan (2) is fixedly connected to the bottom of the main casing (1) and communicates with the main casing (1), and the interior of the main casing (1) and the interior of the oil pan (2) are used for mounting a crank, characterized in that: The inner surface of the oil pan (2) is provided with a plurality of heat collecting plates (5); the heat collecting plates (5) are parallel to each other, and an angle is formed between the heat collecting plates (5) and a horizontal plane; the oil pan (2) further comprises a scraper (4) and a sealing plug (3); the bottom wall of the oil pan (2) is provided with an oil drain hole (211), and the sealing plug (3) is used to slide into and seal the oil drain hole (211); the scraper (4) is slidably connected to the oil pan (2), and the length direction of the scraper (4) is perpendicular to the A heat collecting plate (5) is provided, and a scraper (4) slides against the inner surface of the oil pan (2) and the heat collecting plate (5); a tension spring (8) is connected between the oil pan (2) and the scraper (4); a transmission wire (7) is connected between the scraper (4) and the sealing plug (3); the tension spring (8) and the transmission wire (7) are located on both sides of the scraper (4); when the sealing plug (3) slides away from the oil drain hole (211), the scraper (4) slides in a direction close to the bottom wall of the oil pan (2).

2. An engine casing according to claim 1, characterized in that: The scraper (4) comprises a plate body (41) and a sliding shaft (42); the sliding shaft (42) is fixedly connected to the plate body (41), and the axial direction of the sliding shaft (42) is the same as the length direction of the plate body (41); the plate body (41) is provided with a plurality of scraper grooves (411) distributed along the length direction of the plate body (41); the scraper grooves (411) are used for the heat collecting plate (5) to be embedded, and the groove walls of the scraper grooves (411) are slidably abutted against the heat collecting plate (5); the surface of the plate body (41) provided with the scraper grooves (411) is used for slidably abutting against the oil pan (2); The surface of the heat collecting plate (5) is provided on the oil pan (2), and an angle A greater than 90° exists between the surface of the heat collecting plate (5) and the bottom wall of the oil pan (2); two surfaces of the oil pan (2) along the length direction of the plate body (41) are provided with inclined grooves (221), an angle B exists between the inclined grooves (221) in the length direction and the bottom wall of the oil pan (2), and the angle B is equal to the angle A; two ends of the sliding shaft (42) are respectively slidably embedded in the two inclined grooves (221), and the sliding direction of the sliding shaft (42) is perpendicular to the axial direction of the sliding shaft (42).

3. An engine casing according to claim 2, characterized in that: The tension spring (8) is connected between the oil pan (2) and the plate body (41), and the transmission wire (7) is connected between the plate body (41) and the sealing plug (3); the side of the plate body (41) provided with the scraping groove (411) is higher than the side of the plate body (41) facing away from the scraping groove (411), and the sliding shaft (42) is fixedly connected to the side of the plate body (41) facing away from the scraping groove (411); the distance from one end of the transmission wire (7) connected to the plate body (41) to the notch of the scraping groove (411) is shorter than the distance from one end of the transmission wire (7) connected to the plate body (41) to the sliding shaft (42); and the end of the tension spring (8) connected to the plate body (41) is located between the notch of the scraping groove (411) and the transmission wire (7).

4. An engine casing according to claim 3, characterized in that: Both ends of the sliding shaft (42) are sleeved with rubber rings (6), and the inner circumference and outer circumference of the rubber ring (6) respectively press against the sliding shaft (42) and the groove wall of the inclined groove (221).

5. The engine casing according to claim 1, characterized in that: A plurality of transmission wires (7) are provided, and the ends of the transmission wires (7) connected to the plate body (41) are evenly spaced along the length direction of the scraper (4); a plurality of guide blocks (25) are fixedly connected to the bottom wall of the oil pan (2), and the number of the guide blocks (25) is equal to the number of the transmission wires (7); the guide blocks (25) are provided with through holes for the transmission wires (7) to pass through, and the transmission wires (7) between the guide blocks (25) and the scraper (4) are parallel to each other.

6. The engine casing according to claim 1, characterized in that: A fillet (212) is provided between the inner peripheral surface of the oil drain hole (211) and the inner surface of the oil pan (2).

7. The engine casing according to claim 1, characterized in that: The tension spring (8) is provided with a pre-tightening force that causes the scraper (4) to slide in a direction away from the bottom wall of the oil pan (2).

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