Crankcase with lubricating oil passage clogging prevention structure

Abstract

This invention belongs to the field of engine lubrication technology, specifically a crankcase with an anti-clogging structure for lubrication oil passages. Addressing the problem that existing pipes are long and require complete disassembly for cleaning, increasing installation and disassembly time and causing inconvenience, the following solution is proposed: The crankcase includes multiple bearing seats inside to support the crankshaft. Oil passages are located at the top of the bearing seats, and oil pipes are located at the top of the crankcase. Multiple first extension pipes corresponding to the oil passages are fixedly connected to the bottom of the oil pipes. In this invention, the oil pipes are divided into multiple channels and then fixed by a first fixing block and a second bolt, making installation and disassembly convenient. Only the blocked parts need to be removed and cleaned, improving cleaning efficiency. The flow of oil drives the rotation of the screw conveyor rod, which simultaneously cleans impurities from the filter screen, effectively preventing blockages in the oil passages and extending service life.

Description

Technical Field

[0001] This invention relates to the field of engine lubrication technology, and in particular to a crankcase with a structure for preventing blockage of the lubrication oil passage. Background Technology

[0002] An engine is a machine that converts other forms of energy into mechanical energy. To ensure the normal operation of an engine, a lubrication system is usually installed inside the engine to effectively lubricate the various moving parts. However, for gasoline engines with rocker arm-type side-mounted camshafts, using the existing crankcase lubrication circuit, multiple interconnected oil holes are provided in the crankcase to lubricate the cams and rocker arms on the camshaft.

[0003] During engine operation, a small amount of impurities are generated inside, which can easily clog the oil passages during circulation. Furthermore, the existing oil is supplied through pipes connected to the filter. Since the pipes are long, they need to be completely disassembled for cleaning, increasing disassembly and installation time and making it inconvenient to use. To address the above problems, this invention proposes a crankcase with a lubrication circuit anti-clogging structure. Summary of the Invention

[0004] This invention provides a crankcase with a lubrication oil circuit anti-clogging structure, which solves the shortcomings of the prior art, such as long pipelines, the need for complete disassembly during cleaning, increased disassembly and installation time, and inconvenience in use.

[0005] This invention provides the following technical solution:

[0006] A crankcase with a lubrication oil passage anti-clogging structure includes:

[0007] A crankcase, wherein the inside of the crankcase is provided with multiple bearing seats for supporting the crankshaft, the top of the bearing seats is provided with oil passages, the top of the crankcase is provided with oil pipes, and the bottom of the oil pipes is fixedly connected to multiple first extension pipes corresponding to the oil passages;

[0008] A plug is fixedly connected to the top of the crankcase for blocking one end of the oil pipe, and a connector is fixedly connected to the other end of the oil pipe. A second extension pipe for connecting to the filter is fixedly connected through the bottom of the connector.

[0009] A filter screen is disposed on the inner wall of the first extension tube and is used to filter the lubricating oil in the oil pipe.

[0010] The cleaning mechanism, installed inside the oil pipe, is used to clean impurities remaining on the filter screen;

[0011] The oil pipe includes multiple pipes disposed on the crankcase and corresponding to the oil passages. The first extension pipe is fixedly connected to the bottom of the pipes. The top of the crankcase is provided with a first mounting groove corresponding to the oil passages for placing the pipes.

[0012] The fixing mechanism is installed on the crankcase to fix the pipes.

[0013] In one possible design, the cleaning mechanism includes a spiral conveying rod disposed inside the oil pipe, with a fan blade fixedly fitted on the outer wall of the spiral conveying rod near the connector end, and the outer wall of the spiral conveying rod contacting the filter screen.

[0014] In one possible design, the fixing mechanism includes a first fixing block fixedly connected to the outer wall of the pipe, two second bolts passing through the top of the first fixing block, a plurality of first threaded holes corresponding to the second bolts being opened on the top of the crankcase, arc-shaped grooves being opened at both ends of the pipe, a first sealing gasket being provided in the arc-shaped grooves, a second mounting groove corresponding to the first mounting groove being opened on the top of the crankcase, and a plug being fixedly connected in the second mounting groove for sealing two adjacent pipes and between the pipe and the plug.

[0015] In one possible design, fixed rings are fixedly fitted on the outer walls of both ends of the pipe, and two opposing sliding rings are slidably fitted on the outer walls of the pipe. The two adjacent sliding rings are provided with the same second fixing block. Two first bolts are passed through the top of the second fixing block. The top of the crankcase is provided with a second threaded hole corresponding to the first bolt. Multiple clearance grooves corresponding to the second fixing block are provided in the first mounting groove. The sliding ring is located in the clearance groove.

[0016] In one possible design, the sliding ring has a groove on one side that corresponds to the fixed ring, and a second sealing gasket is provided on one side of the groove.

[0017] In one possible design, the outer side of the sliding ring is provided with an outer bevel, and the inner wall of the second fixing block is provided with an inner bevel corresponding to the two outer bevels.

[0018] In one possible design, the outer wall of the connector is fitted with an inner threaded ring, one end of the connector is fixedly connected to a limiting ring, the outer wall of the pipe near the connector is fixedly fitted with an outer threaded ring, the inner threaded ring is located between the limiting ring and the second extension pipe, and the inner threaded ring is threaded onto the outer wall of the outer threaded ring.

[0019] In one possible design, both ends of the spiral conveyor are provided with tapered heads, and the plug and the connector are provided with tapered holes corresponding to the tapered heads on their respective adjacent sides.

[0020] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the invention.

[0021] In this invention, the oil pipe is divided into multiple pipes and then fixed by a first fixing block and a second bolt, making it easy to install and disassemble. Only the blocked part needs to be removed and cleaned, thus improving cleaning efficiency.

[0022] In this invention, the second fixing block can drive the two sliding rings to move closer to each other, so that they can further seal the two pipes, forming a whole, improving the sealing performance, and facilitating disassembly;

[0023] In this invention, the flow of oil can drive the spiral conveyor to rotate, and the rotation can clean the impurities on the filter screen, which can effectively prevent blockage in the oil passage and improve service life.

[0024] In this invention, the conical head and conical hole design facilitates the support of the spiral conveyor rod via the base and connector, reduces the friction between the spiral conveyor rod and the oil pipe, and makes it easier to position the spiral conveyor rod. Attached Figure Description

[0025] Figure 1 A three-dimensional structural schematic diagram of a crankcase with a lubrication oil circuit anti-clogging structure provided in an embodiment of the present invention;

[0026] Figure 2 This is a side sectional view of a crankcase with an anti-clogging structure for lubrication oil passages provided in an embodiment of the present invention.

[0027] Figure 3 A schematic diagram of the mounting groove structure of a crankcase with a lubrication oil circuit anti-clogging structure provided in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of the piping structure of a crankcase with an anti-clogging structure for lubrication oil passages provided in an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of a crankcase retaining ring structure with an anti-clogging structure for lubrication oil passages provided in an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of a crankcase screw conveyor structure with a lubrication oil circuit anti-clogging structure provided in an embodiment of the present invention;

[0031] Figure 7 This is an enlarged structural diagram of part A of a crankcase with an anti-clogging structure for lubrication oil passages, provided in an embodiment of the present invention.

[0032] Figure 8 This is an enlarged structural diagram of part B of a crankcase with a lubrication oil circuit anti-clogging structure provided in an embodiment of the present invention;

[0033] Figure 9 This is a schematic cross-sectional view of the sliding ring structure of a crankcase with a lubrication oil circuit anti-clogging structure provided in an embodiment of the present invention.

[0034] Figure 10 This is a cross-sectional view of the second fixing block of a crankcase with a lubrication oil circuit anti-clogging structure provided in an embodiment of the present invention.

[0035] Figure label:

[0036] 1. Crankcase; 2. Oil pipe; 3. Connector; 4. Bearing housing; 5. Oil passage; 6. First mounting groove; 7. First fixing block; 8. First extension pipe; 9. Arc groove; 10. First sealing gasket; 11. Second fixing block; 12. Sliding ring; 13. Fixing ring; 14. Plug; 15. Screw conveyor rod; 16. Conical head; 17. Conical hole; 18. Fan blade; 19. Inner threaded ring; 20. Outer threaded ring; 21. Limiting ring; 22. Filter screen; 23. First bolt; 24. Second bolt; 25. First threaded hole; 26. Second threaded hole; 27. Relief groove; 28. Second mounting groove; 29. ​​Outer bevel; 30. Slot; 31. Second sealing gasket; 32. Inner bevel; 33. Second extension pipe; 34. Pipe. Detailed Implementation

[0037] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0038] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the devices are connected to each other and their relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of the present invention, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0039] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0040] In this embodiment of the invention, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] References to "one embodiment" or "some embodiments" as used in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the invention. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized.

[0042] Example 1

[0043] Reference Figures 1-6 A crankcase with a lubrication oil circuit anti-clogging structure, comprising:

[0044] The crankcase 1 has multiple bearing seats 4 inside for supporting the crankshaft. The top of the bearing seats 4 is provided with an oil passage 5. The top of the crankcase 1 is provided with an oil pipe 2. The bottom of the oil pipe 2 is fixedly connected to multiple first extension pipes 8 corresponding to the oil passage 5.

[0045] A plug seat 14 is fixedly connected to the top of the crankcase 1 for blocking one end of the oil pipe 2. A connector 3 is fixedly connected to the other end of the oil pipe 2. A second extension pipe 33 for connecting to the filter is fixedly connected through the bottom of the connector 3.

[0046] Filter screen 22 is disposed on the inner wall of the first extension tube 8 and is used to filter the lubricating oil in the oil pipe 2.

[0047] A cleaning mechanism, installed inside the oil pipe 2, is used to clean impurities remaining on the filter screen 22;

[0048] The oil pipe 2 includes a plurality of pipes 34 disposed on the crankcase 1 and corresponding to the oil passage 5. A first extension pipe 8 is fixedly connected to the bottom of the pipe 34. A first mounting groove 6 corresponding to the oil passage 5 is provided on the top of the crankcase 1 for placing the pipe 34.

[0049] The fixing mechanism is installed on the crankcase 1 to fix the pipe 34. In the above technical solution, by setting a filter screen 22 in the oil pipe 2 and a cleaning mechanism, the filter screen 22 can be automatically cleaned during use, which can effectively prevent the oil passage 5 from becoming blocked. At the same time, the fixing mechanism fixes the pipe 34, making it easy to install and disassemble and improving the cleaning efficiency.

[0050] Reference Figure 6 The cleaning mechanism includes a spiral conveying rod 15 installed inside the oil pipe 2. A fan blade 18 is fixedly sleeved on the outer wall of the spiral conveying rod 15 near the connector 3. The outer wall of the spiral conveying rod 15 is in contact with the filter screen 22. In the above technical solution, the lubricating oil can drive the fan blade 18 to rotate when it flows under high pressure. The fan blade 18 can drive the spiral conveying rod 15 to rotate, thereby cleaning the filter screen 22.

[0051] Reference Figure 3 , Figure 4 , Figures 6-8 The fixing mechanism includes a first fixing block 7 fixedly connected to the outer wall of the pipe 34. Two second bolts 24 are provided through the top of the first fixing block 7. The top of the crankcase 1 is provided with multiple first threaded holes 25 corresponding to the second bolts 24. Both ends of the pipe 34 are provided with arc-shaped grooves 9. A first sealing gasket 10 is provided in the arc-shaped grooves 9. The top of the crankcase 1 is provided with a second mounting groove 28 corresponding to the first mounting groove 6. The plug seat 14 is fixedly connected in the second mounting groove 28 for sealing two adjacent pipes 34 and between the pipe 34 and the plug seat 14. In the above technical solution, the first fixing block 7 is fixed on each pipe 34 and fixed on the crankcase 1 by the second bolts 24 and the first threaded holes 25, so that each pipe 34 can be removed individually, and the first sealing gasket 10 can seal between two adjacent pipes 34.

[0052] Example 2

[0053] Reference Figures 1-6 A crankcase with a lubrication oil circuit anti-clogging structure, comprising:

[0054] The crankcase 1 has multiple bearing seats 4 inside for supporting the crankshaft. The top of the bearing seats 4 is provided with an oil passage 5. The top of the crankcase 1 is provided with an oil pipe 2. The bottom of the oil pipe 2 is fixedly connected to multiple first extension pipes 8 corresponding to the oil passage 5.

[0055] A plug seat 14 is fixedly connected to the top of the crankcase 1 for blocking one end of the oil pipe 2. A connector 3 is fixedly connected to the other end of the oil pipe 2. A second extension pipe 33 for connecting to the filter is fixedly connected through the bottom of the connector 3.

[0056] Filter screen 22 is disposed on the inner wall of the first extension tube 8 and is used to filter the lubricating oil in the oil pipe 2.

[0057] A cleaning mechanism, installed inside the oil pipe 2, is used to clean impurities remaining on the filter screen 22;

[0058] The oil pipe 2 includes a plurality of pipes 34 disposed on the crankcase 1 and corresponding to the oil passage 5. A first extension pipe 8 is fixedly connected to the bottom of the pipe 34. A first mounting groove 6 corresponding to the oil passage 5 is provided on the top of the crankcase 1 for placing the pipe 34.

[0059] The fixing mechanism is installed on the crankcase 1 to fix the pipe 34. In the above technical solution, by setting a filter screen 22 in the oil pipe 2 and a cleaning mechanism, the filter screen 22 can be automatically cleaned during use, which can effectively prevent the oil passage 5 from becoming blocked. At the same time, the fixing mechanism fixes the pipe 34, making it easy to install and disassemble and improving the cleaning efficiency.

[0060] Reference Figure 6 The cleaning mechanism includes a spiral conveying rod 15 installed inside the oil pipe 2. A fan blade 18 is fixedly sleeved on the outer wall of the spiral conveying rod 15 near the connector 3. The outer wall of the spiral conveying rod 15 is in contact with the filter screen 22. In the above technical solution, the lubricating oil can drive the fan blade 18 to rotate when it flows under high pressure. The fan blade 18 can drive the spiral conveying rod 15 to rotate, thereby cleaning the filter screen 22.

[0061] Reference Figure 3 , Figure 4 , Figures 6-8 The fixing mechanism includes a first fixing block 7 fixedly connected to the outer wall of the pipe 34. Two second bolts 24 are provided through the top of the first fixing block 7. The top of the crankcase 1 is provided with multiple first threaded holes 25 corresponding to the second bolts 24. Both ends of the pipe 34 are provided with arc-shaped grooves 9. A first sealing gasket 10 is provided in the arc-shaped grooves 9. The top of the crankcase 1 is provided with a second mounting groove 28 corresponding to the first mounting groove 6. The plug seat 14 is fixedly connected in the second mounting groove 28 for sealing two adjacent pipes 34 and between the pipe 34 and the plug seat 14. In the above technical solution, the first fixing block 7 is fixed on each pipe 34 and fixed on the crankcase 1 by the second bolts 24 and the first threaded holes 25, so that each pipe 34 can be removed individually, and the first sealing gasket 10 can seal between two adjacent pipes 34.

[0062] Reference Figure 5 , Figure 7 and Figure 8 Both ends of the pipe 34 are fixedly fitted with fixing rings 13. Two opposing sliding rings 12 are slidably fitted on the outer wall of the pipe 34. The two adjacent sliding rings 12 are provided with the same second fixing block 11. Two first bolts 23 are passed through the top of the second fixing block 11. The top of the crankcase 1 is provided with a second threaded hole 26 corresponding to the first bolt 23. Multiple clearance grooves 27 corresponding to the second fixing block 11 are provided in the first mounting groove 6. The sliding rings 12 are located in the clearance grooves 27. In the above technical solution, the second fixing block 11 can be fixed on the crankcase 1 by the second threaded hole 26 and the first bolt 23. While the second fixing block 11 is fixed, it can drive the two sliding rings 12 to move closer to each other, thereby further fixing the two adjacent pipes 34.

[0063] Reference Figure 5 and Figure 9 The sliding ring 12 has a groove 30 on one side that corresponds to the fixed ring 13. A second sealing gasket 31 is provided on one side of the groove 30. In the above technical solution, the setting of the second sealing gasket 31 can seal the fixed ring 13 and the sliding ring 12, preventing leakage between two adjacent pipes 34.

[0064] Reference Figure 9 and Figure 10 The outer side of the sliding ring 12 is provided with an outer bevel 29, and the inner wall of the second fixing block 11 is provided with an inner bevel 32 corresponding to the two outer bevels 29. In the above technical solution, when the outer bevels 29 and the inner bevels 32 are used in combination, it is easy to drive the two sliding rings 12 closer to each other when the second fixing block 11 is installed, so that the installation is convenient.

[0065] Reference Figure 6 The outer wall of the connector 3 is fitted with an inner threaded ring 19. One end of the connector 3 is fixedly connected to a limiting ring 21. The outer wall of the pipe 34 near the connector 3 is fixedly fitted with an outer threaded ring 20. The inner threaded ring 19 is located between the limiting ring 21 and the second extension pipe 33. The inner threaded ring 19 is threaded onto the outer wall of the outer threaded ring 20. In the above technical solution, by rotating the inner threaded ring 19, the inner threaded ring 19 is screwed onto the outer threaded ring 20, which can drive the limiting ring 21 and the outer threaded ring 20 to come into contact and seal, making it easy to install and disassemble.

[0066] Reference Figure 6Both ends of the spiral conveyor rod 15 are provided with conical heads 16. The plug seat 14 and the connector 3 are provided with conical holes 17 corresponding to the conical heads 16 on their respective sides. In the above technical solution, the spiral conveyor rod 15 can be supported by the cooperation of the conical heads 16 and the conical holes 17, which facilitates the rotation of the spiral conveyor rod 15 in the pipe 34.

[0067] The working principle and usage process of this technical solution are as follows: When in use, the oil in the crankcase 1 is pumped into the connector 3, and then enters the oil passage 5 through the oil pipe 2 to lubricate the bearing. While the oil flows, it can drive the fan blade 18 to rotate. The rotation of the fan blade 18 can drive the spiral conveyor rod 15 to rotate, thereby removing impurities from the filter screen 22.

[0068] When there are many impurities in the oil pipe 2, rotate the inner threaded ring 19 to disengage it from the outer threaded ring 20, remove the spiral conveying rod 15 from the oil pipe 2, unscrew the first bolt 23 and then remove the second fixing block 11, push the two sliding rings 12 to both sides, then unscrew the corresponding second bolt 24 and remove the first fixing block 7. At this time, the corresponding pipe 34 can be removed and the filter screen 22 can be cleaned.

[0069] During installation, the corresponding pipes 34 are placed in the first mounting groove 6 in sequence, so that the first extension pipe 8 is inserted into the oil passage 5. The pipe 34 near the plug 14 abuts against the plug 14. Then, the pipe 34 is fixed on the first mounting groove 6 by the second bolt 24 and the bearing seat 4. Then, the corresponding two sliding rings 12 are pushed closer to each other, so that the second sealing gasket 31 abuts against the fixed ring 13. Then, the second fixing block 11 is clamped on the two sliding rings 12. The squeezing cooperation of the outer bevel 29 and the inner bevel 32 can drive the two sliding rings 12 closer to each other to further seal between the two pipes 34. Finally, the spiral conveying rod 15 is inserted into the oil pipe 2, and the connector 3 is installed at one end of the oil pipe 2 in sequence.

[0070] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A crankcase having a lubricating oil passage clogging prevention structure, characterized by comprising: include: The crankcase (1) has multiple bearing seats (4) for supporting the crankshaft inside. The top of the bearing seats (4) is provided with an oil passage (5). The top of the crankcase (1) is provided with an oil pipe (2). The bottom of the oil pipe (2) is fixedly connected with multiple first extension pipes (8) corresponding to the oil passage (5). The top of the crankcase (1) is fixedly connected to a plug (14) for blocking one end of the oil pipe (2), and the other end of the oil pipe (2) is fixedly connected to a connector (3). The bottom of the connector (3) is fixedly connected to a second extension pipe (33) for connecting to a filter. A filter screen (22) is disposed on the inner wall of the first extension tube (8) for filtering the lubricating oil in the oil pipe (2); A cleaning mechanism is installed inside the oil pipe (2) to clean the impurities remaining on the filter screen (22); The oil pipe (2) includes multiple pipes (34) disposed on the crankcase (1) and corresponding to the oil passage (5). The first extension pipe (8) is fixedly connected to the bottom of the pipe (34). The top of the crankcase (1) is provided with a first mounting groove (6) corresponding to the oil passage (5) for placing the pipe (34). A fixing mechanism is installed on the crankcase (1) to fix the pipe (34); The cleaning mechanism includes a spiral conveying rod (15) installed in the oil pipe (2). The outer wall of the spiral conveying rod (15) near the connector (3) is fixedly fitted with a fan blade (18). The outer wall of the spiral conveying rod (15) is in contact with the filter screen (22). The outer walls of both ends of the pipe (34) are fixedly fitted with fixing rings (13), and the outer walls of the pipe (34) are slidably fitted with two opposing sliding rings (12). The two adjacent sliding rings (12) are provided with the same second fixing block (11). The top of the second fixing block (11) is provided with two first bolts (23). The top of the crankcase (1) is provided with a second threaded hole (26) corresponding to the first bolt (23). The first mounting groove (6) is provided with multiple relief grooves (27) corresponding to the second fixing block (11). The sliding ring (12) is located in the relief groove (27). The outer wall of the connector (3) is fitted with an inner threaded ring (19), and one end of the connector (3) is fixedly connected to a limiting ring (21). The outer wall of the pipe (34) near the connector (3) is fixedly fitted with an outer threaded ring (20). The inner threaded ring (19) is located between the limiting ring (21) and the second extension pipe (33). The inner threaded ring (19) is threaded onto the outer wall of the outer threaded ring (20). Both ends of the spiral conveyor rod (15) are provided with conical heads (16), and the plug (14) and the connector (3) are provided with conical holes (17) corresponding to the conical heads (16) on their respective close sides. The fixing mechanism includes a first fixing block (7) fixedly connected to the outer wall of the pipe (34). Two second bolts (24) are provided through the top of the first fixing block (7). The top of the crankcase (1) is provided with a plurality of first threaded holes (25) corresponding to the second bolts (24). Both ends of the pipe (34) are provided with arc grooves (9). A first sealing gasket (10) is provided in the arc grooves (9). The top of the crankcase (1) is provided with a second mounting groove (28) corresponding to the first mounting groove (6). The plug (14) is fixedly connected in the second mounting groove (28) for sealing the two adjacent pipes (34) and between the pipe (34) and the plug (14).

2. The crankcase having a lubricating oil passage clogging preventing structure according to claim 1, characterized by The sliding ring (12) has a groove (30) on one side that corresponds to the fixed ring (13), and a second sealing gasket (31) is provided on one side of the groove (30).

3. The crankcase having a lubricating oil passage clogging preventing structure according to claim 1, characterized by The outer side of the sliding ring (12) is provided with an outer bevel (29), and the inner wall of the second fixing block (11) is provided with an inner bevel (32) corresponding to the two outer bevels (29).

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