An engine crankcase oil return collection structure

Abstract

The present invention provides an engine crankcase oil return collection structure, which belongs to the field of engine technology. It solves the technical problem that the oil in the existing engine crankcase is difficult to return smoothly. The engine crankcase oil return collection structure, the engine includes a lower box body and an oil pan, the bottom of the lower box body is fixedly provided with a partition, the partition is surrounded from the bottom with the inner wall of the oil return groove to form an oil return channel, the oil return channel is horizontally arranged and one end is connected to the oil return port, the top of the oil pan has an oil suction port connected to the oil pump, the other end of the oil return channel is connected to the oil suction port, the lower box body structure at the oil return groove port is sealed against the edge of the oil suction port, the junction of the partition and the edge of the oil suction port is provided with an elastic pad, the two sides of the elastic pad are respectively sealed against the two side walls of the oil return groove, and the bottom surface of the sealing elastic pad is simultaneously sealed against the edges of the partition and the oil suction port. The present invention can ensure the oil return effect of the engine oil under the condition of controlling the process cost.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycle engines and relates to an engine crankcase oil return collection structure. Background Art

[0002] The engine lubrication system draws lubricating oil from the oil pool at the bottom of the crankcase through the oil pump, enters the oil pump through the coarse filter and the oil suction channel, is pressurized by the oil pump and then regulated by the pressure limiting device. After pressure regulation, a small amount of excess oil returns to the bottom oil pool, and most of the rest enters the main oil channel of the engine body, and then enters the oil filter installed on the engine body for filtration. After filtration, it is discharged to various parts of the engine body.

[0003] A Chinese patent with application publication number CN101915138A discloses a diesel engine oil pump suction port device, including a suction port coarse filter, an oil suction pipe, and a rotating sleeve mechanism. The oil suction pipe includes an upper suction pipe and a lower suction pipe, and the lower end of the oil suction pipe is fixedly connected to the suction port coarse filter; the lower end of the upper suction pipe and the upper end of the lower suction pipe are bent 90° respectively, and the rotating sleeve mechanism includes an inner sleeve and an outer sleeve, the inner sleeve can be rotatably mounted in the outer sleeve, one end of the inner sleeve is fixedly connected to the upper end of the lower suction pipe, and one end of the outer sleeve is fixedly connected to the lower end of the upper suction pipe.

[0004] The engine oil in the crankcase in the above structure enters the oil pan through the one-way valve arranged on the partition. Before entering the oil pan, the engine oil tends to accumulate above the partition and be agitated by the crank arm, making it difficult for the engine oil to flow back normally. For engines with multiple crank chambers, it is also difficult to ensure that the engine oil can smoothly converge to the same oil filter while ensuring normal reflux. To solve the above problems, general technicians in this field may easily consider the following: 1. increasing the vertical spacing between the crankshaft and the lower part of the crank chamber to avoid direct contact between the crank arm and the accumulated engine oil; 2. setting oil passages connected to the oil filter in the side walls of different crank chambers. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention provides an engine crankcase oil return collection structure. The technical problem to be solved by the present invention is: how to ensure the oil return effect under the condition of controlling the process cost.

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

[0007] The top of the oil pan has an oil suction port connected with the oil pump, and the other end of the oil suction port is connected with the oil pump, and the other end of the oil suction port is connected with the oil pump, and the lower case structure at the oil return groove port is sealed against the edge of the oil suction port, and an elastic pad is provided at the joint of the partition and the edge of the oil suction port, and the two side edges of the elastic pad are respectively sealed against the two side walls of the oil return groove, and the bottom surface of the elastic pad is simultaneously sealed against the partition and the edge of the oil suction port.

[0008] The crankshaft support of the engine is arranged in the case. To facilitate the installation of the crankshaft and other components, the case often includes a detachable upper case and a lower case. A partition is provided in the middle of the lower case to ensure the supporting strength of the middle section of the crankshaft. Therefore, the inner cavity of the lower case is divided into several crankshaft chambers. The bottom of the lower case is connected to the oil pan, which is used to collect the engine oil flowing down from the inner cavity of the engine for circulation. The oil return groove is formed by the bottom surface of the lower housing and the oil return groove is directly connected to the bottom surface of the crankcase, thereby preventing the oil from accumulating at the bottom of the crankcase and causing the crank arm to stir the oil and affect the oil return effect. The horizontally arranged oil return groove is open because it is arranged on the bottom surface of the lower housing and can be directly formed by casting and demolding. Then, a partition is installed to form an oil return passage that can transport the oil far away from the oil suction port, thereby greatly saving the processing cost such as horizontal opening inside the housing. The oil suction port is connected to the oil pump When the oil pump is working, low pressure can be formed in the oil suction port area. The lower box structure at the oil return groove port is set to seal against the edge of the oil suction port, and an elastic pad is set at the joint of the partition and the edge of the oil suction port, so that the two side edges of the elastic pad are respectively sealed against the two side walls of the oil return groove at the joint, and the bottom surface is sealed against the edge of the partition and the oil suction port at the same time. In this way, the elastic pad seals the fitting gap between the partition and the edge of the oil suction port from above to prevent the oil from invading from the bottom of the elastic pad, and the two side edges of the elastic pad cooperate with the inner wall of the oil return groove to prevent the oil from entering the fitting gap from both sides. After entering the oil return channel, the oil needs to pass through the top of the elastic pad and then enter the oil suction port to avoid the pressure loss caused by the partition assembly gap affecting the oil suction speed, thereby ensuring the oil return effect under the condition of controlling the process cost.

[0009] In the above-mentioned engine crankcase oil return collection structure, the elastic pad is in the shape of a disk, and the two side walls of the oil return groove are provided with notches that match the outer edge shape of the elastic pad, and the lower side of the notches is open, and the two side edges of the elastic pad are embedded in the notches and form a limit in the vertical direction. By setting the elastic pad in the shape of a disk, and providing notches that match the outer edge shape of the elastic pad on the two side walls of the oil return groove, and the lower side of the notches is open, the two side edges of the elastic pad are embedded in the notches and form a limit in the vertical direction, and the disk shape is convenient for assemblers to install the notches at any angle, and the notches can ensure that the installation and sealing position of the elastic pad are more accurate through shape adaptation, and at the same time, the inner side wall of the notches cooperates with the surface seal of the elastic pad, reducing the restriction of the elastic pad shape on the sealing length of the two side edges, so that the elastic pad has a better sealing effect, and can improve the resistance effect to the reduction of the sealing effect due to the local deformation of the partition, thereby ensuring the oil return effect.

[0010] In the above-mentioned engine crankcase oil return collection structure, the notch groove is located at the port of the oil return groove, and one end of the notch groove is opened horizontally toward the side where the oil suction port is located. By arranging the notch groove at the port of the oil return groove, so that one end of the notch groove is opened horizontally toward the side where the oil suction port is located, the port of the oil return groove has a larger diameter, which is conducive to directly pulling out the elastic pad from the outside in the horizontal direction when the elastic pad needs to be maintained and replaced, without removing the partition, avoiding affecting the sealing effect of the partition, and ensuring smooth oil return.

[0011] In the above-mentioned engine crankcase oil return collection structure, a coarse filter for filtering the engine oil is provided in the oil suction port, and the outer edge of the elastic pad extends out of the oil return channel and is suspended directly above the coarse filter. The coarse filter is used to filter foreign particles in the engine oil to prevent them from entering the oil pump and causing damage to the mechanism. The outer edge of the elastic pad extends out of the oil return channel and is suspended directly above the coarse filter, so that the elastic pad can produce a better drainage effect. After the engine oil reaches the upper surface of the elastic pad, it can flow directly along the elastic pad to the coarse filter under the action of tension, ensuring smooth oil return.

[0012] In the above-mentioned engine crankcase oil return collection structure, a pressure ring is also provided in the oil suction port, and the pressure ring is pressed above the coarse filter and fixedly connected to the inner wall of the oil suction port. The outer edge of the pressure ring has a positioning notch, and the outer edge of the elastic pad can be matched with the positioning notch. By setting a pressure ring in the oil suction port, which is pressed above the coarse filter and fixedly connected to the inner wall of the oil suction port, and setting a positioning notch on the outer edge of the pressure ring to match the outer edge of the protruding part of the elastic pad, the pressure ring can limit the position of the elastic pad, so as to prevent the elastic pad from being affected by the impact or vibration of the engine oil and falling out of the oil return channel to cause sealing failure, thereby ensuring the stability of the structure.

[0013] In the above-mentioned engine crankcase oil return collection structure, the partition includes a fixed section and a cantilever section that can be elastically deformed in the vertical direction, and the cantilever section is vertically opposite to the elastic pad. By setting the partition to include a fixed section and a cantilever section that can be elastically deformed in the vertical direction, the fixed section is sealed and fitted with the bottom surface of the lower box body to ensure relative fixation, so that the cantilever section is vertically opposite to the elastic pad. In this way, a part of the elastic pad is supported by the cantilever section, and the other part is supported by the edge of the oil suction port. In this way, since the end of the cantilever section is more easily deformed after being stressed, the elastic pad can be elastically squeezed after installation to concentrate the bulging part of the bottom in the area corresponding to the end of the cantilever section. At this time, the deformation of the initial end of the cantilever section is very small, thereby minimizing the influence of the elastic pad on the sealing effect of the partition and ensuring the stability of the oil return.

[0014] In the above-mentioned engine crankcase oil return collection structure, the partition plate has a through oil leakage hole. By arranging the oil leakage hole on the partition plate, the oil leakage hole can be closed by a plugging member when the engine is working. When maintenance is required, the oil accumulated in the oil return channel can be discharged through the oil leakage hole, and then the elastic pad can be taken out, making maintenance convenient.

[0015] In the above-mentioned engine crankcase oil return collection structure, the partition is fixedly connected to the bottom surface of the lower box body by a plurality of bolts, and the plurality of bolts are arranged at intervals along the circumference of the partition, and the cantilever section is located between the two bolts closest to the elastic pad. The partition is fixedly connected to the bottom surface of the lower box body by a plurality of bolts, so that the cantilever section is located between the two bolts closest to the elastic pad, thereby controlling the process cost while ensuring the functional stability of the cantilever section.

[0016] In the above-mentioned engine crankcase oil return collection structure, the edges of the elastic pad are chamfered and transitioned. By arranging the edges of the elastic pad to be chamfered and transitioned, it is beneficial to ensure the convenience of the elastic pad when it is installed into the notch groove from below.

[0017] In the above-mentioned engine crankcase oil return collection structure, the elastic pad is a rubber material piece. Setting the elastic pad as a rubber material piece is conducive to controlling material costs while ensuring the sealing effect.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] The oil return collection structure of the engine crankcase is provided with an oil return port and an oil return groove, and a partition is provided to enclose the inner wall of the oil return groove to form an oil return channel, so that the oil return channel is horizontally arranged and one end is connected to the oil return port, and the other end is connected to the oil suction port in the oil pan. In this way, the return oil in the crankcase can directly flow into the oil return port and flow into the oil suction port through the oil return channel after flowing to the bottom of the crankshaft chamber, thereby avoiding the accumulation of engine oil at the bottom of the crankshaft chamber, causing the crank arm to stir the oil and affect the oil return effect. The horizontally arranged oil return groove is open because it is arranged on the bottom surface of the lower case body, which greatly saves the processing cost such as internal opening; an elastic gasket is provided at the joint between the partition and the edge of the oil suction port for sealing, thereby avoiding the pressure loss caused by the assembly gap between the partition and the outer wall of the oil suction port affecting the oil return speed at this location, thereby ensuring the engine oil return effect while controlling the process cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure from another angle of this embodiment.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of this embodiment.

[0023] Figure 4 yes Figure 3 Enlarged view of part A in .

[0024] Figure 5 It is a three-dimensional schematic diagram of the local structure of this embodiment.

[0025] Figure 6 It is a schematic diagram of the partial structure explosion of this embodiment.

[0026] Figure 7 yes Figure 6 Enlarged view of part B in .

[0027] Figure 8 Schematic diagram of the explosion structure of the oil pan in this embodiment.

[0028] In the figure, 1, lower case; 11, crankshaft chamber; 12, oil return port; 13, oil return groove; 131, notch groove;

[0029] 2. Oil pan; 21. Oil suction port;

[0030] 3. Bulkhead; 31. Fixed section; 32. Cantilever section; 33. Oil leakage hole;

[0031] 4. Oil return channel; 5. Elastic pad; 6. Coarse filter;

[0032] 7. Pressing ring; 71. Positioning notch;

[0033] 8. Bolts. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] like Figure 1-8As shown, in the present engine crankcase oil return collection structure, the engine comprises a lower case 1 and an oil pan 2, the lower case 1 has two crank chambers 11, the oil return collection structure comprises a plurality of oil return ports 12 located at the bottom of the crank chamber 11 and vertically opened and an oil return groove 13 located at the bottom surface of the lower case 1, a horizontally arranged partition 3 is fixedly arranged at the bottom of the lower case 1, the partition 3 is surrounded from below with the inner side wall of the oil return groove 13 to form an oil return channel 4, the top of the oil pan 2 has an oil suction port 21 connected to the oil pump, and an oil return port 12 is arranged along the bottom of the lower case 1. It is vertically connected to the oil suction port 21, the oil return channel 4 is horizontally arranged and one end is connected to an oil return port 12 far away from the oil suction port 21, the other end of the oil return channel 4 is connected to the oil suction port 21, the lower box body 1 structure at the end of the return oil groove 13 is sealed against the edge of the oil suction port 21, and an elastic pad 5 is provided at the joint of the partition 3 and the edge of the oil suction port 21. The two side edges of the elastic pad 5 are respectively sealed against the two side walls of the return oil groove 13 at that location, and the bottom surface of the elastic pad 5 is sealed against the edges of the partition 3 and the oil suction port 21 at the same time. The oil return collecting structure includes an oil return port 12 located at the bottom of the crank chamber 11 and an oil return groove 13 located at the bottom surface of the lower housing 1, and a partition plate 3 is arranged at the bottom of the lower housing 1 to enclose the inner wall of the oil return groove 13 to form an oil return channel 4, so that the oil return channel 4 is horizontally arranged with one end connected to the oil return port 12 and the other end connected to the oil suction port 21 in the oil pan 2. In this way, the return oil in the crankcase can flow to the bottom of the crank chamber 11 and directly flow into the oil return port 12 and flow into the oil suction port 21 through the oil return channel 4, thereby avoiding the accumulation of engine oil at the bottom of the crank chamber 11, which causes the crank arm to stir the oil and affect the oil return effect. The horizontally arranged oil return groove 13 is open because it is arranged on the bottom surface of the lower housing 1 and can be directly formed by casting demolding. Then, by adding the partition plate 3, the oil return channel 4 that can transport the engine oil away from the oil suction port 21 can be formed, which greatly saves the processing cost such as the horizontal opening inside the housing; the oil suction port 21 and the engine oil The pump is connected. When the oil pump is working, a low pressure can be formed in the oil suction port 21 area. The lower box body 1 structure at the port of the oil return groove 13 is set to seal against the edge of the oil suction port 21, and an elastic pad 5 is set at the joint of the partition 3 and the edge of the oil suction port 21, so that the two side edges of the elastic pad 5 are respectively joined to the two side walls of the oil return groove 13, and the bottom surface is simultaneously sealed against the edges of the partition 3 and the oil suction port 21. In this way, the elastic pad 5 seals the fitting gap between the partition 3 and the edge of the oil suction port 21 from the top to prevent the oil from invading from the bottom of the elastic pad 5, and the two side edges of the elastic pad 5 cooperate with the inner wall of the oil return groove 13 to prevent the oil from entering the fitting gap from both sides. After entering the oil return channel 4, the oil needs to pass through the top of the elastic pad 5 and then enter the oil suction port 21, so as to avoid the pressure loss caused by the assembly gap of the partition 3 affecting the oil suction speed, thereby ensuring the oil return effect under the condition of controlling the process cost.Furthermore, the elastic pad 5 is disc-shaped, and both side walls of the oil return groove 13 are provided with notch grooves 131 adapted to the outer edge shape of the elastic pad 5, the lower side of the notch groove 131 is open, and the two side edges of the elastic pad 5 are embedded in the notch groove 131 and form a limit in the vertical direction. The elastic pad 5 is set to be disc-shaped, and the two side walls of the oil return groove 13 are provided with notch grooves 131 that are adapted to the outer edge shape of the elastic pad 5. The lower side of the notch groove 131 is open, so that the two side edges of the elastic pad 5 are embedded in the notch groove 131 and form a limit in the vertical direction. The disc shape is convenient for assemblers to install the notch groove 131 at any angle, and the notch groove 131 can ensure that the installation and sealing position of the elastic pad 5 are more accurate through shape adaptation. At the same time, the inner side wall of the notch groove 131 is sealed with the surface of the elastic pad 5, which reduces the restriction of the elastic pad 5 shape on the sealing length of the two side edges, so that the elastic pad 5 has a better sealing effect, and can improve the resistance to the reduction of the sealing effect due to the local deformation of the partition 3, thereby ensuring the oil return effect. Preferably, the notch grooves 131 are all located at the port of the oil return groove 13, and one end of the notch groove 131 is opened in the horizontal direction toward the side where the oil suction port 21 is located. By arranging the notch groove 131 at the port of the oil return groove 13, one end of the notch groove 131 is opened horizontally toward the side where the oil suction port 21 is located, so that the port of the oil return groove 13 has a larger diameter, which is conducive to directly pulling out the elastic pad 5 from the outside in the horizontal direction when the elastic pad 5 needs to be maintained and replaced, without disassembling the partition 3, avoiding affecting the sealing effect of the partition 3, and ensuring smooth oil return. The partition 3 includes a fixed section 31 and a cantilever section 32 that can be elastically deformed in the vertical direction, and the cantilever section 32 is vertically opposite to the elastic pad 5. By setting the partition 3 to include a fixed section 31 and a cantilever section 32 that can be elastically deformed in the vertical direction, the fixed section 31 is sealed and fitted with the bottom surface of the lower box body 1 to ensure relative fixation, so that the cantilever section 32 is vertically opposite to the elastic pad 5, so that a part of the elastic pad 5 is supported by the cantilever section 32, and the other part is supported by the edge of the oil suction port 21. In this way, since the end of the cantilever section 32 is more easily deformed after being stressed, the elastic pad 5 can be elastically squeezed after installation to concentrate the bulging part of the bottom in the area corresponding to the end of the cantilever section 32, and at this time, the deformation of the initial end of the cantilever section 32 is very small, thereby minimizing the influence of the elastic pad 5 on the sealing effect of the partition 3, and ensuring the stability of oil return. The partition 3 has a through oil leakage hole 33. By setting the oil leakage hole 33 on the partition 3, the oil leakage hole 33 can be closed by a plugging member when the engine is working. When maintenance is required, the oil accumulated in the oil return channel 4 can be discharged through the oil leakage hole 33, and then the elastic pad 5 can be taken out, so that maintenance is convenient. The partition 3 is fixedly connected to the bottom surface of the lower box body 1 by six bolts 8. The six bolts 8 are arranged at intervals along the circumference of the partition 3, and the cantilever section 32 is located between the two bolts 8 closest to the elastic pad 5.The partition 3 is fixedly connected to the bottom surface of the lower box body 1 by a plurality of bolts 8, so that the cantilever section 32 is located between the two bolts 8 closest to the elastic pad 5, so that the function of the cantilever section 32 is guaranteed to be stable while controlling the process cost. The edges of the elastic pad 5 are chamfered and transitioned. By setting the edges of the elastic pad 5 to be chamfered and transitioned, it is beneficial to ensure the convenience of the elastic pad 5 when it is installed into the notch groove 131 from below. The elastic pad 5 is a rubber material. Setting the elastic pad 5 to be a rubber material is beneficial to controlling the material cost while ensuring the sealing effect.

[0036] like Figure 2-4 , Figure 8 As shown, a coarse filter 6 for filtering the engine oil is provided in the oil suction port 21, and the outer edge of the elastic pad 5 extends out of the oil return channel 4 and is suspended directly above the coarse filter 6. The coarse filter 6 is used to filter the foreign particles in the engine oil to prevent them from entering the oil pump and causing damage to the mechanism. The outer edge of the elastic pad 5 extends out of the oil return channel 4 and is suspended directly above the coarse filter 6, so that the elastic pad 5 can produce a better drainage effect. After the engine oil reaches the upper surface of the elastic pad 5, it can flow directly along the elastic pad 5 to the coarse filter 6 under the action of tension, ensuring smooth oil return. Further, a pressure ring 7 is also provided in the oil suction port 21. The pressure ring 7 is pressed above the coarse filter 6 and is fixedly connected to the inner wall of the oil suction port 21. The outer edge of the pressure ring 7 has a positioning notch 71, and the outer edge of the elastic pad 5 can be adapted to the positioning notch 71. By arranging a pressure ring 7 in the oil suction port 21, which is pressed above the coarse filter 6 and fixedly connected to the inner wall of the oil suction port 21, a positioning notch 71 is arranged on the outer edge of the pressure ring 7 to adapt to the outer edge of the protruding part of the elastic pad 5, so that the pressure ring 7 can limit the position of the elastic pad 5, thereby preventing the elastic pad 5 from being disengaged from the oil return channel 4 due to the impact or vibration of the engine oil, causing sealing failure, thereby ensuring structural stability.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An engine crankcase oil return collection structure, the engine comprising a lower case (1) and an oil pan (2), the lower case (1) having a plurality of crankshaft chambers (11), characterized in that: The oil return collection structure comprises a plurality of oil return ports (12) located at the bottom of the crankshaft chamber (11) and an oil return groove (13) located at the bottom surface of the lower housing (1). A partition plate (3) is fixedly provided at the bottom of the lower housing (1). The partition plate (3) is enclosed with the inner wall of the oil return groove (13) from below to form an oil return channel (4). The oil return channel (4) is arranged horizontally and one end of the oil return port (12) is connected to the oil return port. The top of the oil pan (2) has an oil suction port (21) connected to the oil pump. The other end of the oil return passage (4) is in communication with the oil suction port (21); the lower box body (1) structure at the port of the oil return groove (13) is in sealing contact with the edge of the oil suction port (21); an elastic pad (5) is provided at the junction of the partition plate (3) and the edge of the oil suction port (21); the two side edges of the elastic pad (5) are in sealing contact with the two side walls of the oil return groove (13), respectively; and the bottom surface of the elastic pad (5) is in sealing contact with the edges of the partition plate (3) and the oil suction port (21) at the same time.

2. The engine crankcase oil return collection structure according to claim 1, characterized in that: The elastic pad (5) is disc-shaped, and both side walls of the oil return groove (13) are provided with notched grooves (131) adapted to the shape of the outer edge of the elastic pad (5). The lower side of the notched groove (131) is open, and both side edges of the elastic pad (5) are embedded in the notched groove (131) and form a limit position in the vertical direction.

3. The engine crankcase oil return collection structure according to claim 2, characterized in that: The notched groove (131) is located at the end of the oil return groove (13), and one end of the notched groove (131) is opened in a horizontal direction toward the side where the oil suction port (21) is located.

4. The engine crankcase oil return collection structure according to claim 1, 2 or 3, characterized in that: A coarse filter (6) for filtering engine oil is provided in the oil suction port (21), and the outer edge of the elastic pad (5) extends out of the oil return channel (4) and is suspended directly above the coarse filter (6).

5. The engine crankcase oil return collection structure according to claim 4, characterized in that: A pressing ring (7) is also provided in the oil suction port (21). The pressing ring (7) is pressed above the coarse filter (6) and is fixedly connected to the inner wall of the oil suction port (21). The outer edge of the pressing ring (7) has a positioning notch (71), and the outer edge of the elastic pad (5) can be matched with the positioning notch (71).

6. The engine crankcase oil return collection structure according to claim 2 or 3, characterized in that: The partition plate (3) comprises a fixed section (31) and a cantilever section (32) capable of elastic deformation in the vertical direction, and the cantilever section (32) is vertically opposed to and abuts against the elastic cushion block (5).

7. The engine crankcase oil return collection structure according to claim 1, 2 or 3, characterized in that: The partition plate (3) is provided with a through oil leakage hole (33).

8. The engine crankcase oil return collection structure according to claim 6, characterized in that: The partition plate (3) is fixedly connected to the bottom surface of the lower box body (1) by a plurality of bolts (8), the plurality of bolts (8) are arranged at intervals along the circumference of the partition plate (3), and the cantilever section (32) is located between two of the bolts (8) closest to the elastic pad (5).

9. The engine crankcase oil return collection structure according to claim 2 or 3, characterized in that: The edges of the elastic pad (5) are chamfered and transitioned.

10. The engine crankcase oil return collection structure according to claim 1, 2 or 3, characterized in that: The elastic pad (5) is a rubber material piece.

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