Crankcase ventilation structure and engine

Abstract

The invention relates to the technical field of engines, and particularly discloses a crankcase ventilation structure and an engine, the crankcase ventilation structure comprises a cylinder body, a separator and an oil inlet pipe, the cylinder body is provided with a main oil duct and a supply oil duct, engine oil flows in the main oil duct, the separator is fixedly connected with the cylinder body, an oil inlet of the separator is communicated with the supply oil duct, and an oil outlet of the separator is communicated with the oil inlet pipe. One end of the oil inlet pipe communicates with the main oil duct, and the other end of the oil inlet pipe communicates with the supply oil duct. The oil supply channel is arranged on the cylinder body, oil is supplied to the oil inlet pipe through the main oil channel, the oil inlet pipe is communicated with the oil supply channel, and the oil supply channel supplies oil into the oil inlet of the separator, so that the length of a pipeline for supplying oil to the separator is shortened, the occupied space around an engine is reduced, the arrangement of the engine is facilitated, and the assembly difficulty is reduced; meanwhile, the number of parts is reduced, and the failure rate is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a crankcase ventilation structure and an engine. Background Art

[0002] Crankcase ventilation primarily involves separating the crankcase's mixed gas and oil through an oil-gas separator. The separated gases are then released into the atmosphere or fed back into the engine for combustion, while the separated oil returns to the oil pan to continue lubricating the engine. Oil-gas separators come in both active and passive types. Traditional crankcase ventilation systems generally use passive oil-gas separators, but these have low separation efficiency and can easily cause oil to condense and drip at the outlet over time.

[0003] In response to this, the related art provides a crankcase ventilation structure that utilizes an active oil-gas separator. High-pressure oil is supplied to the active oil-gas separator via an oil pump, driving the separator to draw in and separate the crankcase's mixed gas, thereby significantly improving separation efficiency. However, this structure requires a long oil supply line to supply oil to the active oil-gas separator, and it requires a large number of components. This makes assembly difficult in an engine installation environment and requires a significant amount of space around the engine. During installation, it can easily interfere with other components within the engine compartment, hindering engine layout. Furthermore, the large number of components can increase the failure rate. Summary of the Invention

[0004] The object of the present invention is to provide a crankcase ventilation structure and an engine, so as to reduce the number of components of an oil supply pipeline and reduce the space occupied by the surrounding area of the engine.

[0005] The present invention provides a crankcase ventilation structure, including a cylinder block, a separator, an oil inlet pipe, an air intake pipe and an air outlet pipe. The cylinder block is provided with a main oil passage and a supply oil passage, and organic oil flows in the main oil passage. The separator is fixedly connected to the cylinder block, and the oil inlet of the separator is communicated with the supply oil passage. One end of the oil inlet pipe is communicated with the main oil passage, and the other end of the oil inlet pipe is communicated with the supply oil passage. The air intake pipe is communicated with the air intake of the separator, and crankcase exhaust gas enters the separator through the air intake pipe. One end of the air outlet pipe is communicated with the air outlet of the separator, and the other end of the air outlet pipe is communicated with the atmosphere or the engine air intake.

[0006] As an optimal technical solution for the crankcase ventilation structure, one end of the oil inlet pipe is connected to an oil inlet joint, the oil inlet joint is threadedly connected to the inner wall of the main oil channel, and the main oil channel is connected to the oil inlet pipe through the oil inlet joint.

[0007] As a preferred technical solution of the crankcase ventilation structure, a first sealing member is provided between the oil inlet joint and the cylinder block, and the first sealing member is used for sealing the oil inlet joint and the cylinder block.

[0008] As an optimal technical solution for the crankcase ventilation structure, it also includes a hollow bolt, and the other end of the oil inlet pipe is provided with an oil pipe ball head, the oil pipe ball head is connected to the oil inlet pipe, the hollow bolt passes through the oil pipe ball head and is threadedly connected to the cylinder body, the oil pipe ball head, the hollow bolt and the cylinder body together form a ball head oil chamber, the hollow bolt is provided with a bolt cavity and a connecting hole, the bolt cavity is connected to the ball head oil chamber through the connecting hole, and the bolt cavity is connected to the supply oil channel.

[0009] As an optimal technical solution for the crankcase ventilation structure, a second seal is provided between the hollow bolt and the oil pipe ball head, and the second seal is used to seal the head of the hollow bolt and the oil pipe ball head; a third seal is provided between the oil pipe ball head and the cylinder body, and the third seal is used to seal the oil pipe ball head and the cylinder body.

[0010] As a preferred technical solution of the crankcase ventilation structure, the diameter of the oil inlet is greater than or equal to the diameter of the oil supply passage.

[0011] As an optimal technical solution for the crankcase ventilation structure, the separator is further provided with an oil outlet, and the cylinder body is further provided with an oil return passage. The oil outlet is connected to the oil return passage, and the engine oil flows back to the oil pan through the oil return passage.

[0012] As an optimal technical solution for the crankcase ventilation structure, the oil inlet pipe is a steel pipe with a metal braided tube.

[0013] The present invention provides an engine comprising the crankcase ventilation structure of any one of the above solutions.

[0014] As a preferred technical solution of the engine, the engine is a diesel engine.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a crankcase ventilation structure, which provides an oil supply channel on the cylinder block, supplies oil to the oil inlet pipe through the main oil channel, and the oil inlet pipe is connected to the oil supply channel. The oil supply channel supplies oil to the oil inlet of the separator, shortening the length of the pipeline supplying oil to the separator, thereby reducing the space occupied by the surrounding area of the engine, facilitating the layout of the engine and reducing the difficulty of assembly, while reducing the number of parts and lowering the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1An exploded view of the crankcase ventilation structure in an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of the connection between the air intake pipe and the separator in an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of the connection between the air outlet pipe and the separator in an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the structure in which the oil inlet pipe is connected to the main oil passage of the cylinder block in an embodiment of the present invention;

[0021] Figure 5 This is a structural diagram of the oil inlet pipe communicating with the oil supply passage of the cylinder block in an embodiment of the present invention;

[0022] Figure 6 Schematic diagram of the path of oil entering the separator from the oil inlet pipe in an embodiment of the present invention;

[0023] Figure 7 Schematic diagram of the flow path of the mixed gas and oil in an embodiment of the present invention.

[0024] In the picture:

[0025] 1. Separator; 11. Air inlet; 12. Air outlet; 13. Base; 131. Oil inlet; 132. Oil outlet; 14. Fasteners;

[0026] 21. Inlet pipe; 22. Outlet pipe;

[0027] 31. First clamp; 32. Second clamp;

[0028] 4. Cylinder block; 41. Main oil passage; 42. Supply oil passage;

[0029] 5. Oil inlet pipe; 51. Oil inlet joint; 52. Oil pipe ball joint; 521. Oil chamber of ball joint;

[0030] 6. Hollow bolt; 61. Bolt cavity; 62. Connecting hole;

[0031] 71. First sealing member; 72. Second sealing member; 73. Third sealing member. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] like Figure 1-Figure 7As shown, the present invention provides a crankcase ventilation structure, which is used to separate the oil-gas mixture in the crankcase of the engine. The crankcase ventilation structure includes a cylinder block 4, a separator 1, an oil inlet pipe 5, an air inlet pipe 21 and an air outlet pipe 22. The cylinder block 4 is provided with a main oil passage 41, a supply oil passage 42 and an oil return passage (not shown in the figure), and oil flows in the main oil passage 41. The main oil passage 41 is connected to the lubricating oil passage of the cylinder block 4, and the oil after lubrication is collected from various parts of the cylinder block 4 to the main oil passage 41. The separator 1 is an active oil-gas separator 1, which can extract the mixed gas in the crankcase for oil-gas separation. The internal structure of the separator 1 and the principle of achieving oil-gas separation are prior art in this field and will not be elaborated here. Separator 1 is provided with a base 13, which securely connects separator 1 to cylinder block 4. Base 13 is provided with multiple through-holes, through which fasteners 14 pass and are threadedly connected to cylinder block 4, thereby securing separator 1 to cylinder block 4. Base 13 is provided with an oil inlet 131 and an oil outlet 132. Oil inlet 131 communicates with the supply oil passage 42, while oil outlet 132 communicates with the oil return passage of the cylinder block, through which the engine oil returns to the oil sump. One end of the oil inlet pipe 5 connects to the main oil passage 41, while the other end connects to the supply oil passage 42. High-pressure oil flowing in the main oil passage 41 enters the supply oil passage 42 through the oil inlet pipe 5, and then directly enters the oil inlet 131 of separator 1, driving the operation of separator 1. An air intake pipe 21, a rubber hose, connects to separator 1 via a first clamp 31. The crankcase mixture rises to the cylinder head through the relevant pipelines installed on the engine and enters the separator 1 through the intake pipe 21. The relevant pipeline structure that allows the crankcase mixture to rise to the cylinder head is prior art in this field and will not be described in detail here. One end of the outlet pipe 22 is connected to the outlet port 12 of the separator 1. The outlet pipe 22 is a rubber tube and is connected to the separator 1 through a second clamp 32. The other end of the outlet pipe 22 is connected to the atmosphere or the engine intake port 11. The engine exhaust separated by the separator 1 is discharged to the atmosphere through the outlet pipe 22 or connected to the engine intake port 11 to re-enter the engine combustion. The crankcase ventilation structure in this embodiment is achieved by providing an oil supply passage 42 in the cylinder block 4, supplying oil to the oil inlet pipe 5 through the main oil passage 41, and the oil inlet pipe 5 is then connected to the oil supply passage 42. The oil supply passage 42 supplies oil into the oil inlet port 131 of the separator 1, that is, only the oil inlet pipe 5 and the connecting joints at both ends of the oil inlet pipe 5 need to occupy the external space of the cylinder block 4, and the remaining oil supply pipelines are provided on the cylinder block 4, and the oil inlet port 131 of the separator 1 is directly connected to the oil supply passage 42, thereby shortening the length of the pipeline supplying oil to the separator 1 and reducing the space occupied around the engine, which is beneficial to the layout of the engine and reduces the difficulty of assembly, while reducing the number of parts and reducing the failure rate.

[0037] For further information, please refer to Figure 4 As shown, one end of the oil inlet pipe 5 is connected to an oil inlet connector 51, which is threadedly connected to one end of the oil inlet pipe 5. The oil inlet connector 51 is also threadedly connected to the inner wall of the main oil gallery 41. The main oil gallery 41 and the oil inlet pipe 5 are connected via the oil inlet connector 51. A first seal 71 is provided between the oil inlet connector 51 and the cylinder block 4 to seal the oil inlet connector 51 and the cylinder block 4. In this embodiment, the first seal 71 is a high-temperature and high-pressure resistant rubber gasket.

[0038] For further information, please refer to Figure 5-Figure 6 As shown, the other end of the oil inlet pipe 5 is provided with an oil pipe ball head 52, which is connected to the oil inlet pipe 5. The specific structure of the oil pipe ball head 52 is the existing technology in this field and will not be repeated here. The hollow bolt 6 passes through the oil pipe ball head 52 and is threadedly connected to the cylinder body 4. Therefore, the oil pipe ball head 52, the head of the hollow bolt 6 and the cylinder body 4 together form a ball head oil chamber 521. The hollow bolt 6 is provided with a bolt cavity 61 and a connecting hole 62. The bolt cavity 61 extends along the axial direction of the hollow bolt 6, and the connecting hole 62 extends along the radial direction of the hollow bolt 6 and is connected to the bolt cavity 61. The portion of the hollow bolt 6 provided with the connecting hole 62 is located in the ball head oil chamber 521, so that the bolt cavity 61 is connected to the ball head oil chamber 521 through the connecting hole 62. The cylinder block 4 is provided with a bolt hole for threaded connection with the hollow bolt 6, and the bolt hole is connected to the oil supply passage 42, so that after the hollow bolt 6 passes through the oil pipe ball head 52 and is threadedly connected to the cylinder block 4, the bolt cavity 61 of the hollow bolt 6 is connected to the oil supply passage 42. Figure 6 Following the path indicated by the dotted arrow in the figure, the oil in the oil inlet pipe 5 passes through the oil pipe ball 52 and enters the ball head oil chamber 521. It then enters the bolt cavity 61 through the connecting hole 62 and then enters the oil supply passage 42. Finally, it enters the oil inlet 131 of the separator 1, driving the separator 1 to operate. A second seal 72 is provided between the hollow bolt 6 and the oil pipe ball 52. This seal is used to seal the head of the hollow bolt 6 and the oil pipe ball 52. A third seal 73 is provided between the oil pipe ball 52 and the cylinder block 4. This seal is used to seal the oil pipe ball 52 and the cylinder block 4. In this embodiment, both the second seal 72 and the third seal 73 are rubber gaskets that are resistant to high temperatures and high pressures.

[0039] Optionally, the diameter of the oil inlet 131 is greater than or equal to the diameter of the oil supply channel 42. Specifically, the diameter of the oil inlet 131 is greater than or equal to the diameter of the outlet of the oil supply channel 42, and the oil inlet 131 is aligned with the outlet of the oil supply channel 42 to avoid throttling during the process of the engine oil entering the oil inlet 131 from the oil supply channel 42, resulting in pressure loss or flow loss.

[0040] Optionally, the oil inlet pipe 5 in this embodiment is a steel pipe with a metal braided tube. The steel pipe with a metal braided tube can withstand higher oil pressure and has good radial structural strength, and the probability of failure during use is lower.

[0041] The present invention provides an engine including the crankcase ventilation structure of this embodiment. By providing the crankcase ventilation structure of this embodiment, the space occupied by the engine is smaller, which is more conducive to the layout of the engine. In this embodiment, the engine is a diesel engine.

[0042] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Crankcase ventilation structure, characterized in that: include: A cylinder body (4), wherein the cylinder body (4) is provided with a main oil passage (41) and a supply oil passage (42), wherein oil flows in the main oil passage (41); A separator (1), the separator (1) being fixedly connected to the cylinder body (4), and the oil inlet (131) of the separator (1) being in communication with the oil supply passage (42); an oil inlet pipe (5), one end of the oil inlet pipe (5) being in communication with the main oil passage (41), and the other end of the oil inlet pipe (5) being in communication with the supply oil passage (42); An air intake pipe (21) and an air outlet pipe (22), wherein the air intake pipe (21) is communicated with the air intake port (11) of the separator (1), and the crankcase exhaust gas enters the separator (1) through the air intake pipe (21), one end of the air outlet pipe (22) is communicated with the air outlet port (12) of the separator (1), and the other end of the air outlet pipe (22) is communicated with the atmosphere or the engine air intake port (11).

2. The crankcase ventilation structure according to claim 1, characterized in that: One end of the oil inlet pipe (5) is connected to an oil inlet joint (51), the oil inlet joint (51) is threadedly connected to the inner wall of the main oil passage (41), and the main oil passage (41) and the oil inlet pipe (5) are communicated through the oil inlet joint (51).

3. The crankcase ventilation structure according to claim 2, characterized in that: A first sealing member (71) is provided between the oil inlet joint (51) and the cylinder body (4), and the first sealing member (71) is used to seal the oil inlet joint (51) and the cylinder body (4).

4. The crankcase ventilation structure according to claim 1, characterized in that: The invention also includes a hollow bolt (6). The other end of the oil inlet pipe (5) is provided with an oil pipe ball head (52). The oil pipe ball head (52) is communicated with the oil inlet pipe (5). The hollow bolt (6) passes through the oil pipe ball head (52) and is threadedly connected to the cylinder body (4). The oil pipe ball head (52), the hollow bolt (6) and the cylinder body (4) together form a ball head oil chamber (521). The hollow bolt (6) is provided with a bolt cavity (61) and a communicating hole (62). The bolt cavity (61) is communicated with the ball head oil chamber (521) through the communicating hole (62). The bolt cavity (61) is communicated with the oil supply passage (42).

5. The crankcase ventilation structure according to claim 4, characterized in that: A second sealing member (72) is provided between the hollow bolt (6) and the oil pipe ball head (52), and the second sealing member (72) is used to seal the head of the hollow bolt (6) and the oil pipe ball head (52); a third sealing member (73) is provided between the oil pipe ball head (52) and the cylinder body (4), and the third sealing member (73) is used to seal the oil pipe ball head (52) and the cylinder body (4).

6. The crankcase ventilation structure according to claim 1, characterized in that: The diameter of the oil inlet (131) is greater than or equal to the diameter of the oil supply passage (42).

7. The crankcase ventilation structure according to claim 1, characterized in that: The separator (1) is further provided with an oil outlet (132), and the cylinder block (4) is further provided with an oil return passage. The oil outlet (132) is communicated with the oil return passage, and the engine oil flows back to the oil pan through the oil return passage.

8. The crankcase ventilation structure according to any one of claims 1 to 7, characterized in that: The oil inlet pipe (5) is a steel pipe with a metal braided tube.

9. An engine, characterized in that The crankcase ventilation structure comprises the crankcase ventilation structure according to any one of claims 1 to 8.

10. The engine according to claim 9, characterized in that The engine is a diesel engine.

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