Crankshaft lubricating oil duct structure and engine

Abstract

The utility model relates to the technical field of engines, and particularly discloses a crankshaft lubricating oil duct structure and an engine, and the crankshaft lubricating oil duct structure comprises a main journal, a connecting rod journal, a first lubricating oil duct and a plane. The main journal is provided with a main oil duct, one end of the first lubricating oil duct is communicated with the main oil duct, the other end of the first lubricating oil duct penetrates to the outer surface of the connecting rod journal, and the connecting line of the projection of the central axis of the main journal and the projection of the central axis of the connecting rod journal on the plane forms a first straight line. The connecting point and the central point of the projection of the central axis of the connecting rod journal on the plane form a second straight line, and the included angle A between the first straight line and the second straight line is limited within the angle range of 55-80 degrees in the rotating direction of the engine, so that a high oil film pressure area is avoided, excessive damage to a lubricating oil film is avoided, and the service life of the engine is prolonged. And meanwhile, lubrication between the bearing bush and the connecting rod journal is effectively improved, so that the problem of bearing bush biting faults caused by abnormal wear in the middle of a bearing bush bearing area is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of engine crankshafts, in particular to a crankshaft lubricating oil passage structure and an engine. Background Art

[0002] At present, the crankshaft is one of the important components of an engine. In order to ensure the lubrication between the crankshaft, the bearing shells and the connecting rods, etc., a cooled lubricating oil passage is provided on the crankshaft journal. With the requirement of reducing fuel consumption for vehicle diesel engines, the combustion explosion pressure is continuously increasing, and the lubrication between the bearing shell and the connecting rod journal is becoming increasingly severe. Various abnormal wear will occur on the upper bearing shell of the connecting rod, which is the main load-bearing part. Among them, the middle wear of the load-bearing area of the upper bearing shell of the connecting rod has become a common phenomenon in high-explosion-pressure internal combustion engines. In severe cases, it will lead to the occurrence of bearing seizure faults, affecting the reliability of the bearing shell and the whole machine. Content of the Utility Model

[0003] The purpose of the utility model is to provide a crankshaft lubricating oil passage structure and an engine to solve the problem of the middle wear of the load-bearing area of the upper bearing shell of the connecting rod in the prior art, resulting in the occurrence of bearing seizure faults.

[0004] On the one hand, the utility model provides a crankshaft lubricating oil passage structure, including a main journal, a connecting rod journal, a first lubricating oil passage and a plane. The main journal and the connecting rod journal are connected. The main journal has a main oil passage. One end of the first lubricating oil passage is communicated with the main oil passage, and the other end of the first lubricating oil passage penetrates to the outer surface of the connecting rod journal. The central axis of the main journal and the central axis of the connecting rod journal are parallel. The plane is perpendicular to the central axis of the main journal. The connecting line of the projections of the central axes of the main journal and the connecting rod journal on the plane forms a first straight line. The intersection point of the central axis of the first lubricating oil passage and the outer peripheral circle of the projection of the connecting rod journal on the plane forms a connection point. The connecting line of the connection point and the center point of the projection of the central axis of the connecting rod journal on the plane forms a second straight line. In the rotation direction of the engine, the included angle A between the first straight line and the second straight line satisfies 55° ≤ A ≤ 80°.

[0005] As an optional technical solution of the crankshaft lubricating oil passage structure, 55° ≤ A ≤ 75°.

[0006] As an optional technical solution of the crankshaft lubricating oil passage structure, both the main journal and the connecting rod journal are multiple, and the multiple main journals and the multiple connecting rod journals are arranged at intervals in turn.

[0007] As an alternative technical solution for the crankshaft lubricating oil passage structure, the plurality of main journals include a first main journal, a second main journal, and a third main journal, the plurality of connecting rod journals include a first connecting rod journal, a second connecting rod journal, and a third connecting rod journal, and the first main journal, the first connecting rod journal, the second main journal, the second connecting rod journal, the third main journal, and the third connecting rod journal are connected in sequence.

[0008] As an alternative technical solution for the crankshaft lubricating oil passage structure, there are three first lubricating oil passages, and the first main journal, the second main journal, and the third main journal all have the main oil passage; wherein, one end of one of the first lubricating oil passages communicates with the main oil passage of the first main journal, and the other end penetrates to the outer surface of the first connecting rod journal; one end of another first lubricating oil passage communicates with the main oil passage of the second main journal, and the other end penetrates to the outer surface of the second connecting rod journal; one end of yet another first lubricating oil passage communicates with the main oil passage of the third main journal, and the other end penetrates to the outer surface of the third connecting rod journal.

[0009] On the other hand, the present invention provides an engine, including an engine body and the crankshaft lubricating oil passage structure in any of the above solutions, and the crankshaft lubricating oil passage structure is installed on the engine body.

[0010] The beneficial effects of the present invention are:

[0011] The present invention provides a crankshaft lubricating oil passage structure, which includes a main journal, a connecting rod journal, a first lubricating oil passage, and a plane. Among them, the main journal has a main oil passage, one end of the first lubricating oil passage communicates with the main oil passage, the other end of the first lubricating oil passage penetrates to the outer surface of the connecting rod journal, the connecting line of the central axes of the main journal and the connecting rod journal projected on the plane forms a first straight line, and the connecting line of the connection point and the central point of the central axis of the connecting rod journal projected on the plane forms a second straight line. In the rotation direction of the engine, the angle A between the first straight line and the second straight line is limited within the angular range of 55° - 80°. With such a setting, the high oil film pressure area is avoided, the excessive damage to the lubricating oil film is avoided, and at the same time, the lubrication between the bearing shell and the connecting rod journal is effectively improved, thereby avoiding the problem of abnormal wear in the middle of the bearing shell bearing area and causing the occurrence of the bearing seizure fault. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the crankshaft lubricating oil passage structure in an embodiment of the present invention;

[0013] Figure 2 is a cross-sectional view of the crankshaft lubricating oil passage structure in an embodiment of the present invention.

[0014] In the figure:

[0015] 1. Main journal; 11. Main oil passage; 12. First main journal; 13. Second main journal; 14. Third main journal;

[0016] 2. Connecting rod journal; 21. First connecting rod journal; 22. Second connecting rod journal; 23. Third connecting rod journal;

[0017] 3. First lubricating oil passage;

[0018] 41. First straight line; 42. Connection point; 43. Second straight line. Detailed implementation manner

[0019] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work shall fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions. Moreover, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0021] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0023] As Figures 1 to 2 shown, this embodiment provides a crankshaft lubricating oil passage structure, which includes a main journal 1, a connecting rod journal 2, a first lubricating oil passage 3 and a plane. Among them, the main journal 1 and the connecting rod journal 2 are connected. The main journal 1 has a main oil passage 11. One end of the first lubricating oil passage 3 communicates with the main oil passage 11, and the other end of the first lubricating oil passage 3 penetrates to the outer surface of the connecting rod journal 2. The central axis of the main journal 1 and the central axis of the connecting rod journal 2 are parallel. The plane is perpendicular to the central axis of the main journal 1. The connecting line of the projections of the central axes of the main journal 1 and the connecting rod journal 2 on the plane forms a first straight line 41. The intersection point of the central axis of the first lubricating oil passage 3 and the outer circumferential circle of the projection of the connecting rod journal 2 on the plane forms a connection point 42. The connecting line of the connection point 42 and the center point of the projection of the central axis of the connecting rod journal 2 on the plane forms a second straight line 43. In the rotation direction of the engine, the angle between the first straight line 41 and the second straight line 43 is A, and 55° ≤ A ≤ 80°.

[0024] With the crankshaft lubricating oil passage structure of the present utility model, the main journal 1 has a main oil passage 11. One end of the first lubricating oil passage 3 communicates with the main oil passage 11, and the other end of the first lubricating oil passage 3 penetrates to the outer surface of the connecting rod journal 2. The connecting line of the projections of the central axes of the main journal 1 and the connecting rod journal 2 on the plane forms a first straight line 41. The connecting line of the connection point 42 and the center point of the projection of the central axis of the connecting rod journal 2 on the plane forms a second straight line 43. In the rotation direction of the engine, the angle A between the first straight line 41 and the second straight line 43 is limited within the angular range of 55° - 80°. With such a setting, the high oil film pressure area is avoided, the excessive damage to the lubricating oil film is avoided, and at the same time, the lubrication between the bearing shell and the connecting rod journal 2 is effectively improved, thereby avoiding the abnormal wear in the middle of the bearing shell bearing area and the problem of the occurrence of the bearing seizure fault.

[0025] Specifically, 55° ≤ A ≤ 75°. The angle A between the first straight line 41 and the second straight line 43 is limited within the above angular range. The angle of the first lubricating oil passage 3 is optimized through finite simulation analysis and reliability verification and comparison are carried out. With such a setting, the high oil film pressure area can be avoided, the excessive damage to the lubricating oil film can be avoided, and at the same time, the lubrication between the bearing shell and the connecting rod journal 2 is effectively improved, thereby avoiding the abnormal wear in the middle of the bearing shell bearing area.

[0026] Among them, the included angle A between the first straight line 41 and the second straight line 43 can be selected according to the actual situation, and the angle of the included angle A between the first straight line 41 and the second straight line 43 can be selected as 55°, 60°, 65°, 70°, 75°, etc.

[0027] In this embodiment, there are multiple main journals 1 and multiple connecting rod journals 2, and the multiple main journals 1 and the multiple connecting rod journals 2 are arranged at intervals in sequence. In this solution, as Figure 1 shown, the multiple main journals 1 include a first main journal 12, a second main journal 13, and a third main journal 14, and the multiple connecting rod journals 2 include a first connecting rod journal 21, a second connecting rod journal 22, and a third connecting rod journal 23. The first main journal 12, the first connecting rod journal 21, the second main journal 13, the second connecting rod journal 22, the third main journal 14, and the third connecting rod journal 23 are connected in sequence.

[0028] Specifically, there are three first lubricating oil channels 3, and the first main journal 12, the second main journal 13, and the third main journal 14 all have main oil channels 11; among them, one end of one first lubricating oil channel 3 communicates with the main oil channel 11 of the first main journal 12, and the other end penetrates to the outer surface of the first connecting rod journal 21; one end of another first lubricating oil channel 3 communicates with the main oil channel 11 of the second main journal 13, and the other end penetrates to the outer surface of the second connecting rod journal 22; one end of yet another first lubricating oil channel 3 communicates with the main oil channel 11 of the third main journal 14, and the other end penetrates to the outer surface of the third connecting rod journal 23. With such a setting, the first lubricating oil channel 3 can lubricate the main oil channel 11 of the first main journal 12 and the first connecting rod journal 21, the main oil channel 11 of the second main journal 13 and the second connecting rod journal 22, and the main oil channel 11 of the third main journal 14 and the third connecting rod journal 23 respectively.

[0029] Optionally, the crankshaft lubricating oil channel structure of the present invention is applicable to various types of four-stroke crank connecting rod mechanism in-line internal combustion engines.

[0030] This embodiment also provides an engine, which includes an engine body and the crankshaft lubricating oil passage structure in the above solution, and the crankshaft lubricating oil passage structure is installed on the engine body. In the engine adopting the utility model, the main journal 1 has a main oil passage 11, one end of the first lubricating oil passage 3 is communicated with the main oil passage 11, and the other end of the first lubricating oil passage 3 penetrates to the outer surface of the connecting rod journal 2. The connecting line of the central axes of the main journal 1 and the connecting rod journal 2 projected on a plane forms a first straight line 41, and the connecting line of the connection point 42 and the central point of the central axis of the connecting rod journal 2 projected on the plane forms a second straight line 43. In the rotation direction of the engine, the included angle A between the first straight line 41 and the second straight line 43 is limited within the angular range of 55°-80°. With such a setting, the high oil film pressure area is avoided, the excessive damage to the lubricating oil film is avoided, and at the same time, the lubrication between the bearing shell and the connecting rod journal 2 is effectively improved, thereby avoiding the abnormal wear in the middle of the bearing shell bearing area and the problem of the occurrence of the bearing seizure fault.

[0031] Obviously, the above embodiments of the present utility model are only examples for clearly explaining the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A crankshaft lubricating oil passage structure, characterized in that, It includes a main journal (1), a connecting rod journal (2), a first lubricating oil passage (3) and a plane. The main journal (1) is connected to the connecting rod journal (2). The main journal (1) has a main oil passage (11). One end of the first lubricating oil passage (3) communicates with the main oil passage (11), and the other end of the first lubricating oil passage (3) penetrates to the outer surface of the connecting rod journal (2). The central axis of the main journal (1) is parallel to the central axis of the connecting rod journal (2). The plane is perpendicular to the central axis of the main journal (1). The connecting line of the projections of the central axes of the main journal (1) and the connecting rod journal (2) on the plane forms a first straight line (41). The intersection point of the central axis of the first lubricating oil passage (3) and the outer peripheral circle of the projection of the connecting rod journal (2) on the plane forms a connection point (42). The connecting line of the connection point (42) and the central point of the projection of the central axis of the connecting rod journal (2) on the plane forms a second straight line (43). In the rotation direction of the engine, the included angle A between the first straight line (41) and the second straight line (43) satisfies 55° ≤ A ≤ 80°.

2. The crankshaft lubricating oil passage structure according to claim 1, wherein, 55°≤A≤75°。 3. The crankshaft lubricating oil passage structure according to claim 1, characterized in that, Both the main journal (1) and the connecting rod journal (2) are multiple, and the multiple main journals (1) and the multiple connecting rod journals (2) are arranged at intervals in sequence.

4. The crankshaft lubricating oil passage structure according to claim 3, characterized in that, The multiple main journals (1) include a first main journal (12), a second main journal (13) and a third main journal (14). The multiple connecting rod journals (2) include a first connecting rod journal (21), a second connecting rod journal (22) and a third connecting rod journal (23). The first main journal (12), the first connecting rod journal (21), the second main journal (13), the second connecting rod journal (22), the third main journal (14) and the third connecting rod journal (23) are connected in sequence.

5. The crankshaft lubricating oil passage structure according to claim 4, characterized in that, There are three first lubricating oil passages (3). The first main journal (12), the second main journal (13) and the third main journal (14) all have the main oil passage (11). Among them, one end of a first lubricating oil passage (3) communicates with the main oil passage (11) of the first main journal (12), and the other end penetrates to the outer surface of the first connecting rod journal (21). Another end of a first lubricating oil passage (3) communicates with the main oil passage (11) of the second main journal (13), and the other end penetrates to the outer surface of the second connecting rod journal (22). The other end of yet another first lubricating oil passage (3) communicates with the main oil passage (11) of the third main journal (14), and the other end penetrates to the outer surface of the third connecting rod journal (23).

6. An engine, characterized in that, It includes an engine body and the crankshaft lubricating oil passage structure according to any one of claims 1 - 5, and the crankshaft lubricating oil passage structure is installed on the engine body.

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