A lubrication structure for motorcycle engine
The lubrication structure addresses inefficient oil circulation and excessive oil accumulation by using an auxiliary oil pump and oil collecting cavity with through holes and a herringbone design, enhancing oil collection and circulation efficiency and preventing crankshaft hindrance.
Patent Information
- Application Number
- CN202011393550.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-02
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2040-12-02
AI Technical Summary
Existing motorcycle engine lubrication systems face issues with inefficient oil circulation and excessive oil accumulation in the crankshaft mounting cavity, which hinders the rotation of the crankshaft and can damage the oil pump.
A lubrication structure with an auxiliary oil pump and oil collecting cavity located below the crankshaft and shift shaft cavities, connected through holes, and a herringbone-shaped raised portion to facilitate free-falling oil collection, integrated with a main oil pump for efficient oil return and circulation.
The structure reduces excessive oil accumulation, improves oil collection efficiency, prevents crankshaft hindrance, and enhances overall oil circulation, while maintaining a compact engine design.
Smart Images
Figure CN112412572B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of motorcycles, in particular to a lubrication structure of a motorcycle engine. Background Art
[0002] A motorcycle engine is a machine that ignites the fuel mixture that enters the cylinder and converts the heat energy generated by its combustion into mechanical energy, and the crankshaft transmits the power to the rear wheel of the motorcycle through the transmission mechanism to convert it into the driving power of the vehicle. The body of a motorcycle engine is the skeleton of the engine, which is used to install and support the various assembly parts of the engine. The body generally includes an oil pan, a crankcase, a cylinder block and a cylinder head. The crankcase has a crankshaft mounting cavity and a shift shaft mounting cavity. The crankshaft is set in the crankshaft mounting cavity, and the shift shaft is set in the shift shaft mounting cavity. The oil pan is filled with engine oil, and an oil pump is also installed in the engine. During the operation of the engine, the oil pump works to pump up the engine oil in the oil pan, and the engine oil is transported upward to various oil circuits, and lubricates and cools various parts on the body. The engine oil on each component flows back or drips into the crankcase, and then flows back from the crankcase to the oil pan. Due to the high oil extraction efficiency of the oil pump, the oil in the crankcase flows back to the oil pan slowly, and the oil supply in the oil pan is insufficient, causing the oil in the oil pan to be quickly drained out, causing the oil pump to inhale air and even idle during the oil extraction process, making the oil pump easily damaged, and also affecting the lubrication and cooling of various engine components.
[0003] In order to solve the above technical problems, China Patent Network discloses a motorcycle and V-twin engine lubrication system [Authorization Announcement No.: CN206845257U], including an oil tank, a main oil pump and an auxiliary oil pump. The oil inlet of the main oil pump is connected to the oil tank, and the oil outlet of the auxiliary oil pump is connected to the oil tank. When the engine is working, the oil tank supplies oil to the main oil pump, and the main oil pump supplies oil from the oil tank to various oil-requiring points of the engine. The auxiliary oil pump pumps the circulated oil into the oil tank to speed up the reflux speed of the oil, ensure that there is enough oil in the main tank, avoid the main oil pump from being short of oil, and ensure that the main oil pump has sufficient oil suction.
[0004] The crankcase of an existing motorcycle engine has a crankshaft mounting cavity and a shift shaft mounting cavity, which are independent chambers. After the engine oil lubricates various parts of the engine, part of the engine oil will flow back or drip into the crankshaft mounting cavity, so that part of the engine oil will be collected in the crankshaft mounting cavity, and another part of the engine oil will flow back or drip into the crankshaft mounting cavity, so that another part of the engine oil will be collected in the shift shaft mounting cavity. The bottom of the crankshaft mounting cavity is lower than the bottom of the shift shaft mounting cavity. In order to allow the engine oil in the crankshaft mounting cavity and the shift shaft mounting cavity to gather, technicians in this field generally use a method of forming a groove at the bottom of the shift shaft mounting cavity and the crankshaft mounting cavity. An oil inlet channel is opened between the mounting cavities, and the crankshaft mounting cavity and the shift shaft mounting cavity are connected through the oil inlet channel, so that the engine oil in the shift shaft mounting cavity flows into the crankshaft mounting cavity through the oil inlet channel, and the engine oil is gathered in the crankshaft mounting cavity, thereby facilitating the auxiliary oil pump to extract the concentrated engine oil. Although the oil circulation efficiency is improved, the following defects exist: after all the engine oil is gathered into the crankshaft mounting cavity, the engine oil level in the crankshaft mounting cavity rises significantly, the engine oil will submerge most of the crankshaft, and part of the crankshaft is directly immersed in the engine oil. The engine oil hinders the rotation of the crankshaft and reduces the mechanical energy output of the crankshaft. Summary of the invention
[0005] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose a lubrication structure for a motorcycle engine. The technical problem to be solved by the present invention is: how to improve the oil circulation efficiency while solving the problem of excessive oil in the crankshaft mounting cavity hindering the rotation of the crankshaft.
[0006] The purpose of the present invention can be achieved by the following technical solutions:
[0007] A lubrication structure for a motorcycle engine comprises an oil pan, a crankcase and an auxiliary oil pump, wherein the crankcase has a crankshaft cavity and a shift shaft cavity, and is characterized in that the lubrication structure further comprises an oil pump mounting shell positioned between the oil pan and the crankcase, the auxiliary oil pump is arranged in the oil pump mounting shell, the oil pump mounting shell has an oil collecting cavity, the bottom of the crankshaft cavity and the bottom of the shift shaft cavity are both provided with through holes connected to the oil collecting cavity, the oil inlet of the auxiliary oil pump is connected to the oil collecting cavity, and the oil outlet of the auxiliary oil pump is connected to the inner cavity of the oil pan.
[0008] When the engine is operating, the oil used to lubricate and cool various engine components flows back and drips into the crankshaft cavity and the shift shaft cavity. The oil in the crankshaft cavity and the shift shaft cavity are collected into the oil collecting cavity through the through holes. After the auxiliary oil pump works, the oil in the oil collecting cavity is pumped into the oil pan. The oil collecting chamber of the present structure is located below the crankshaft chamber and the shift shaft chamber, and the crankshaft chamber and the shift shaft chamber are connected to the oil collecting chamber through through holes respectively. The oil collecting chamber is equivalent to increasing the depth of the crankshaft chamber and the shift shaft chamber. The engine oil in the crankshaft chamber and the engine oil in the shift shaft chamber directly fall into the oil collecting chamber in a free-falling manner. On the one hand, the oil height in the crankshaft chamber and the shift shaft chamber is reduced to avoid excessive oil accumulation in the crankshaft chamber and the shift shaft chamber, thereby avoiding the problem of excessive oil accumulation in the crankcase hindering the rotation of the crankshaft. On the other hand, the engine oil in the crankshaft chamber and the engine oil in the shift shaft chamber are quickly collected, thereby improving the oil collection efficiency. The engine oil in the oil collecting chamber is then centrally extracted by the auxiliary oil pump, thereby improving the oil return efficiency of the engine oil returning to the oil pan, thereby improving the oil circulation efficiency. In addition, the auxiliary oil pump of the present structure is integrated in the chamber formed between the crankcase and the oil pan, the auxiliary oil pump is not easy to be damaged, and the volume of the engine is reduced, making the arrangement of the engine on the vehicle more convenient.
[0009] In the above-mentioned lubrication structure of a motorcycle engine, the crankcase has a raised portion that arches upward to divide the interior of the crankcase into the crankshaft cavity and the shift shaft cavity, and the cross section of the raised portion is a herringbone structure.
[0010] Through the setting of this structure, the raised portion is in the shape of a "human" and after the engine oil drips onto the side wall of the raised portion, the engine oil will flow downward along the side wall of the raised portion, so that the engine oil will quickly gather toward the bottom of the crankshaft cavity and the bottom of the shift shaft cavity, thereby improving the oil collection efficiency.
[0011] In the above-mentioned lubrication structure of a motorcycle engine, the through hole at the bottom of the crankshaft cavity and the through hole at the bottom of the shift shaft cavity are both partially opened on the corresponding side walls of the raised portion.
[0012] With this structural setting, the engine oil on the side wall of the raised portion flows directly into the through hole and directly enters the oil collecting chamber through the through hole, avoiding excessive oil accumulation at the bottom of the crankshaft chamber and the bottom of the shift shaft chamber, further improving the oil collection efficiency.
[0013] In the above-mentioned motorcycle engine lubrication structure, the crankshaft cavity includes at least two independent oil chambers, each of which has the through hole at the bottom; and the shift shaft cavity has at least two through holes at the bottom.
[0014] Through the setting of this structure, a through hole is opened at the bottom of each oil chamber, so that the engine oil in each oil chamber can enter the oil collecting chamber through the through hole. At least two through holes are opened at the bottom of the shift shaft chamber, which improves the efficiency of the engine oil in the shift shaft chamber entering the oil collecting chamber.
[0015] In the above-mentioned lubrication structure of a motorcycle engine, the lower part of the oil pump mounting shell is fixedly connected to the oil pan, and the upper part of the oil pump mounting shell is fixedly connected to the crankcase.
[0016] Through the arrangement of this structure, the oil pump mounting shell is installed stably and firmly, and the connection stability between the oil pan and the crankcase is also improved.
[0017] In the above-mentioned lubrication structure of a motorcycle engine, the bottom of the oil pan has an oil return channel 1 arranged in the transverse direction, the bottom of the oil collecting chamber is provided with an oil return hole connected to one end of the oil return channel 1, the oil pump mounting shell has an oil return channel 2 arranged in the vertical direction, and the lower end of the oil return channel 2 is connected to the other end of the oil return channel 1, and the upper end of the oil return channel 2 is connected to the oil inlet of the auxiliary oil pump; the crankcase has an oil return channel 3, the inner end of the oil return channel 3 is connected to the oil outlet of the auxiliary oil pump, and the outer end of the oil return channel 3 faces the inner cavity of the oil pan.
[0018] Through the arrangement of this structure, when the auxiliary oil pump is working, the oil in the oil collecting chamber enters the auxiliary oil pump through the oil return hole, oil return channel 1 and oil return channel 2, and the auxiliary oil pump draws the oil into the oil return channel 3, and the oil is sprayed from the outer end of the oil return channel 3 into the inner cavity of the oil pan, thereby realizing the rapid reflux of the oil from the oil collecting chamber to the inner cavity of the oil pan.
[0019] In the above-mentioned lubrication structure of a motorcycle engine, the oil return channel three is located above the auxiliary oil pump, the oil return channel three is arranged at an angle, and the outer end of the oil return channel three faces the inner wall of the oil pan.
[0020] Through the arrangement of this structure, after the engine oil is drawn into the oil return channel three, the engine oil is sprayed onto the inner wall of the oil pan from the outer port of the oil return channel three. The inclined structure of the oil return channel three increases the injection speed of the engine oil and realizes the rapid reflux of the engine oil. After the engine oil lubricates and cools the engine parts, the temperature of the engine oil is relatively high. The oil pan is directly in contact with the vehicle chassis, and the temperature of the oil pan is quite low. After the engine oil is sprayed on the inner wall of the oil pan, the engine oil gradually flows from the inner wall of the oil pan to the bottom of the oil pan. The engine oil is in full contact with the oil pan, which is beneficial to reducing the temperature of the engine oil.
[0021] In the above-mentioned lubrication structure of a motorcycle engine, the lubrication structure further comprises a main oil pump arranged in the oil pump mounting housing, and the oil inlet of the main oil pump is communicated with the inner cavity of the oil pan.
[0022] Through the arrangement of this structure, the main oil pump and the auxiliary oil pump of this structure are integrated in the chamber formed between the crankcase and the oil pan, which further reduces the size of the engine. The engine has a compact structure, making it more convenient to arrange the engine on the vehicle.
[0023] In the above-mentioned motorcycle engine lubrication structure, the lubrication structure also includes a pump shaft passing through the oil pump mounting shell, one end of the pump shaft is connected to the main oil pump, and the other end is connected to the auxiliary oil pump.
[0024] Through the setting of this structure, the main oil pump and the auxiliary oil pump are driven by the same pump shaft, the main oil pump and the auxiliary oil pump work synchronously, and without increasing the output power of the auxiliary oil pump, it can be ensured that the oil in the crankshaft chamber will not submerge part of the crankshaft, and the engine oil can also circulate quickly.
[0025] In the above-mentioned lubrication structure of a motorcycle engine, the bottom of the oil pan has an oil inlet channel 1 arranged in the transverse direction, the oil pump mounting shell has an oil inlet channel 2 arranged in the vertical direction, one end of the oil inlet channel 1 is communicated with the inner cavity of the oil pan, the other end of the oil inlet channel 1 is communicated with the lower end of the oil inlet channel 2, and the upper end of the oil inlet channel 2 is communicated with the oil inlet of the main oil pump; the oil pump mounting shell has an oil outlet channel 1, the oil pan has an oil outlet channel 2 and an oil outlet channel 3, the oil outlet channel 1 is arranged vertically, the upper end of the oil outlet channel 1 is communicated with the oil outlet of the main oil pump, one end of the oil outlet channel 2 is communicated with the lower end of the oil outlet channel 1, the other end of the oil outlet channel 2 is communicated with one end of the oil outlet channel 3, and an oil filter is arranged in the oil outlet channel 3.
[0026] With the arrangement of this structure, the engine oil in the oil pan enters into the main oil pump through the oil inlet channel 1 and the oil inlet channel 2 in turn, and then the engine oil in the main oil pump supplies oil to the lubricating oil circuit of the engine through the oil outlet channel 1, the oil outlet channel 2 and the oil outlet channel 3 in turn. The oil filter is arranged to filter impurities in the engine oil to prevent the engine oil from damaging the components during the process of lubricating and cooling the components.
[0027] Compared with the prior art, the lubrication structure of the motorcycle engine of the present invention has the following advantages: the oil collecting chamber of the present structure is located below the crankshaft chamber and the shift shaft chamber, the crankshaft chamber and the shift shaft chamber are respectively connected to the oil collecting chamber through through holes, the oil collecting chamber is equivalent to increasing the depth of the crankshaft chamber and the shift shaft chamber, the engine oil in the crankshaft chamber and the engine oil in the shift shaft chamber directly enter the oil collecting chamber in a free-falling manner, on the one hand, the oil height in the crankshaft chamber and the shift shaft chamber is reduced, and the situation of excessive oil accumulation in the crankshaft chamber and the shift shaft chamber is avoided, thereby avoiding the crankshaft chamber and the shift shaft chamber from being too deep. The problem of excessive oil accumulation in the axle box hindering the rotation of the crankshaft is solved. On the one hand, the engine oil in the crankshaft cavity and the engine oil in the shift shaft cavity are quickly collected, thereby improving the oil collection efficiency. The oil in the oil collecting cavity is then centrally extracted by the auxiliary oil pump, thereby improving the oil return efficiency to the oil pan, thereby improving the oil circulation efficiency. In addition, the auxiliary oil pump of the present structure is integrated in the chamber formed between the crankcase and the oil pan, the auxiliary oil pump is not easy to be damaged, and the size of the engine is reduced, making the arrangement of the engine on the vehicle more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.
[0029] Figure 2 It is a three-dimensional structural schematic diagram of the crankcase of the present invention with the crankshaft and the shift shaft removed.
[0030] Figure 3 It is a top view of the present invention.
[0031] Figure 4 is along Figure 3 Schematic diagram of the cross-sectional structure of AA.
[0032] Figure 5 is along Figure 3 Schematic diagram of the cross-sectional structure of BB.
[0033] Figure 6 is along Figure 3 Schematic diagram of the cross-sectional structure of CC.
[0034] Figure 7 It is the front view of the present invention.
[0035] Figure 8 is along Figure 7 Schematic diagram of the cross-sectional structure of AA.
[0036] Fig. 9 is along Figure 7 Schematic diagram of the cross-sectional structure of BB.
[0037] Fig.10 is along Figure 7 Schematic diagram of the cross-sectional structure of CC.
[0038] In the figure, 1. oil pan; 101. oil return channel 1; 102. oil inlet channel 1; 103. oil outlet channel 2; 104. oil outlet channel 3; 2. crankcase; 20. crankshaft cavity; 201. oil cavity; 21. raised portion; 22. shift shaft cavity; 23. oil return channel 3; 3. auxiliary oil pump; 4. oil pump mounting shell; 40. oil collecting cavity; 401. oil return hole; 41. oil return channel 2; 42. oil inlet channel 2; 43. oil outlet channel 1; 5. through hole; 6. main oil pump; 7. pump shaft; 8. oil filter; 9. filter screen 1; 10. filter screen 2; 11. crankshaft; 12. shift shaft. DETAILED DESCRIPTION
[0039] 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.
[0040] like Figure 1 to Figure 6 As shown, the lubrication structure of the motorcycle engine includes an oil pan 1, a crankcase 2, an auxiliary oil pump 3 and a main oil pump 6. The oil inlet of the main oil pump 6 is connected to the inner cavity of the oil pan 1. The lubrication structure also includes an oil pump mounting shell 4 positioned between the oil pan 1 and the crankcase 2. The lower part of the oil pump mounting shell 4 is fixedly connected to the oil pan 1, and the upper part of the oil pump mounting shell 4 is fixedly connected to the crankcase 2. The main oil pump 6 and the auxiliary oil pump 3 are both arranged in the oil pump mounting shell 4. The crankcase 2 has a crankshaft cavity 20 and a shift shaft cavity 22, the crankshaft 11 is arranged in the crankshaft cavity 20, the shift shaft 12 is arranged in the shift shaft cavity 22, the oil pump mounting shell 4 has an oil collecting cavity 40, the bottom of the crankshaft cavity 20 and the bottom of the shift shaft cavity 22 are both provided with a through hole 5 connected to the oil collecting cavity 40, the oil collecting cavity 40 is located below the through hole 5, the oil inlet of the auxiliary oil pump 3 is connected to the oil collecting cavity 40, and the oil outlet of the auxiliary oil pump 3 is connected to the inner cavity of the oil pan 1.
[0041] During the operation of the engine, the oil used to lubricate and cool the various engine components flows back and drips into the crankshaft cavity 20 and the shift shaft cavity 22. The oil in the crankshaft cavity 20 and the shift shaft cavity 22 are collected into the oil collecting cavity 40 through the through hole 5. After the auxiliary oil pump 3 works, the oil in the oil collecting cavity 40 is pumped into the oil pan 1. Since the oil collecting cavity 40 is located below the crankshaft cavity 20 and the shift shaft cavity 22, the crankshaft cavity 20 and the shift shaft cavity 22 are connected to the oil collecting cavity 40 through the through hole 5 respectively. The oil collecting cavity 40 is equivalent to increasing the depth of the crankshaft cavity 20 and the shift shaft cavity 22. The oil in the crankshaft cavity 20 and the shift shaft cavity 22 directly enter the oil collecting cavity 40 in a free-falling manner. On the one hand, the oil height in the crankshaft cavity 20 and the shift shaft cavity 22 is reduced, and the situation of excessive oil accumulation in the crankshaft cavity 20 and the shift shaft cavity 22 is avoided, thereby avoiding excessive oil accumulation in the crankcase 2. On the one hand, it solves the problem of hindering the rotation of the crankshaft, and on the other hand, it makes the engine oil in the crankshaft chamber 20 and the engine oil in the shift shaft chamber 20 quickly gather, thereby improving the oil collection efficiency, and then the auxiliary oil pump 3 is used to centrally extract the oil in the oil collecting chamber 40, thereby improving the oil return efficiency of the oil returning to the oil pan 1, thereby improving the oil circulation efficiency; in addition, the main oil pump 6 and the auxiliary oil pump 3 of the present structure are integrated in the chamber formed between the crankcase 2 and the oil pan 1, which reduces the size of the engine and makes the engine structure compact, making the arrangement of the engine on the vehicle more convenient.
[0042] like Fig.10 As shown, the lubrication structure also includes a pump shaft 7 that penetrates the oil pump mounting housing 4, one end of the pump shaft 7 is connected to the main oil pump 6, and the other end is connected to the auxiliary oil pump 3. The main oil pump 6 and the auxiliary oil pump 3 are driven by the same pump shaft 7, the main oil pump 6 and the auxiliary oil pump 6 work synchronously, and without increasing the output power of the auxiliary oil pump 3, it can also ensure that the oil in the crankshaft chamber 20 will not submerge part of the crankshaft, and at the same time, the engine oil can circulate quickly.
[0043] like Figure 2 and Figure 4 As shown, the crankcase 2 has a raised portion 21 that arches upward to divide the interior of the crankcase 2 into a crankshaft chamber 20 and a shift shaft chamber 22, and the cross section of the raised portion 21 is a "human" shaped structure. In this embodiment, the through hole 5 at the bottom of the crankshaft chamber 20 and the through hole 5 at the bottom of the shift shaft chamber 22 are partially opened on the corresponding side walls of the raised portion 21, and the engine oil drips on the side wall of the raised portion 21. The engine oil on the side wall of the raised portion 21 directly flows into the through hole 5 and directly enters the oil collecting chamber 40 through the through hole 5, thereby avoiding excessive oil accumulation at the bottom of the crankshaft chamber 20 and the bottom of the shift shaft chamber 22, and further improving the collection efficiency of the engine oil. The crankshaft chamber 20 includes at least two independent oil chambers 201, and each oil chamber 201 has a through hole 5 at the bottom; the shift shaft chamber 22 has at least two through holes 5 at the bottom.
[0044] like Figures 1 to 8 As shown, the bottom of the oil pan 1 has an oil return channel 101 arranged in the horizontal direction, a filter screen 9 is arranged in the oil return channel 101, an oil return hole 401 connected to one end of the oil return channel 101 is opened at the bottom of the oil collecting chamber 40, and the oil pump mounting shell 4 has an oil return channel 2 41 arranged in the vertical direction, and the lower end of the oil return channel 2 41 is connected to the other end of the oil return channel 101, and the upper end of the oil return channel 2 41 is connected to the oil inlet of the auxiliary oil pump 3; the crankcase 2 has an oil return channel 3 23, the inner end of the oil return channel 3 23 is connected to the oil outlet of the auxiliary oil pump 3, and the outer end of the oil return channel 3 23 faces the inner cavity of the oil pan 1. In this embodiment, the oil return channel 3 23 is located above the auxiliary oil pump 3, the oil return channel 3 23 is inclined, and the outer end of the oil return channel 3 23 faces the inner wall of the oil pan 1. When the auxiliary oil pump 3 is working, the oil in the oil collecting chamber 40 enters the auxiliary oil pump 3 through the oil return hole 401, the oil return channel 1 101 and the oil return channel 2 41, and the auxiliary oil pump 3 draws the oil into the oil return channel 3 23, and the oil is sprayed from the outer end of the oil return channel 3 23 into the inner cavity of the oil pan 1, thereby realizing the rapid reflux of the oil from the oil collecting chamber 40 to the inner cavity of the oil pan 1.
[0045] like Figures 1 to 9 As shown, the bottom of the oil pan 1 has an oil inlet channel 102 arranged in the transverse direction, and a filter screen 10 is arranged in the oil inlet channel 102. The oil pump mounting shell 4 has an oil inlet channel 42 arranged in the vertical direction, one end of the oil inlet channel 102 is connected to the inner cavity of the oil pan 1, the other end of the oil inlet channel 102 is connected to the lower end of the oil inlet channel 42, and the upper end of the oil inlet channel 42 is connected to the oil inlet of the main oil pump 6; the oil pump mounting shell 4 has an oil outlet channel 1 43, the oil pan 1 has an oil outlet channel 2 103 and an oil outlet channel 3 104, the oil outlet channel 1 43 is arranged vertically, the upper end of the oil outlet channel 1 43 is connected to the oil outlet of the main oil pump 6, one end of the oil outlet channel 2 103 is connected to the lower end of the oil outlet channel 1 43, the other end of the oil outlet channel 2 103 is connected to one end of the oil outlet channel 3 104, and an oil filter 8 is arranged in the oil outlet channel 3 104. The engine oil in the oil pan 1 enters the main oil pump 6 through the oil inlet channel 1 102 and the oil inlet channel 2 42 in turn, and then the engine oil in the main oil pump 6 supplies oil to the lubricating oil circuit of the engine through the oil outlet channel 1 43, the oil outlet channel 2 103 and the oil outlet channel 3 104 in turn. The oil filter 8 is set to filter impurities in the engine oil to prevent the engine oil from damaging the components during the process of lubricating and cooling the components.
[0046] 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. A lubrication structure for a motorcycle engine, comprising an oil pan (1), a crankcase (2) and an auxiliary oil pump (3), wherein the crankcase (2) has a crankshaft cavity (20) and a gearshift shaft cavity (22), and wherein: The lubrication structure further comprises an oil pump mounting shell (4) positioned between the oil pan (1) and the crankcase (2), the auxiliary oil pump (3) being arranged in the oil pump mounting shell (4), the oil pump mounting shell (4) having an oil collecting chamber (40), the bottom of the crankshaft chamber (20) and the bottom of the shift shaft chamber (22) both being provided with through holes (5) communicating with the oil collecting chamber (40), the oil inlet of the auxiliary oil pump (3) being connected with the oil collecting chamber (40), the oil outlet of the auxiliary oil pump (3) being connected with the inner chamber of the oil pan (1), the bottom of the oil pan (1) being provided with an oil return channel (101) arranged in a transverse direction, the bottom of the oil collecting chamber (40) being provided with an oil return hole (401) communicating with one end of the oil return channel (101), and the lubrication structure further comprises a main oil pump (6) arranged in the oil pump mounting shell (4).
2. A motorcycle engine lubrication structure according to claim 1, characterized in that: The crankcase (2) has a raised portion (21) which arches upwards and divides the interior of the crankcase (2) into the crankshaft cavity (20) and the gearshift shaft cavity (22); the cross section of the raised portion (21) is in a herringbone structure.
3. A motorcycle engine lubrication structure according to claim 2, characterized in that: The through hole (5) at the bottom of the crankshaft cavity (20) and the through hole (5) at the bottom of the gearshift shaft cavity (22) are both partially opened on the corresponding side walls of the raised portion (21).
4. A motorcycle engine lubrication structure according to claim 1, characterized in that: The crankshaft cavity (20) comprises at least two independent oil cavities (201), and the bottom of each oil cavity (201) is provided with the through hole (5); the bottom of the shift shaft cavity (22) is provided with at least two of the through holes (5).
5. The lubrication structure of a motorcycle engine according to claim 1, characterized in that: The lower part of the oil pump mounting shell (4) is fixedly connected to the oil pan (1), and the upper part of the oil pump mounting shell (4) is fixedly connected to the crankcase (2).
6. A motorcycle engine lubrication structure according to any one of claims 1 to 5, characterized in that: The oil pump mounting housing (4) has a second oil return channel (41) arranged vertically, and the lower end of the second oil return channel (41) is connected to the other end of the first oil return channel (101), and the upper end of the second oil return channel (41) is connected to the oil inlet of the auxiliary oil pump (3); the crankcase (2) has a third oil return channel (23), the inner end of the third oil return channel (23) is connected to the oil outlet of the auxiliary oil pump (3), and the outer end of the third oil return channel (23) faces the inner cavity of the oil pan (1).
7. A motorcycle engine lubrication structure according to claim 6, characterized in that: The oil return channel three (23) is located above the auxiliary oil pump (3), and the oil return channel three (23) is arranged at an angle, with the outer end of the oil return channel three (23) facing the inner wall of the oil pan (1).
8. A motorcycle engine lubrication structure according to any one of claims 1 to 5, characterized in that: The oil inlet of the main oil pump (6) is in communication with the inner cavity of the oil pan (1).
9. A motorcycle engine lubrication structure according to claim 8, characterized in that: The lubrication structure further comprises a pump shaft (7) which is inserted through the oil pump mounting housing (4); one end of the pump shaft (7) is connected to the main oil pump (6) and the other end is connected to the auxiliary oil pump (3).
10. A motorcycle engine lubrication structure according to claim 8, characterized in that: The bottom of the oil pan (1) has an oil inlet channel 1 (102) arranged in a transverse direction, and the oil pump mounting shell (4) has an oil inlet channel 2 (42) arranged in a vertical direction. One end of the oil inlet channel 1 (102) is in communication with the inner cavity of the oil pan (1), and the other end of the oil inlet channel 1 (102) is in communication with the lower end of the oil inlet channel 2 (42). The upper end of the oil inlet channel 2 (42) is in communication with the oil inlet of the main oil pump (6). The oil pump mounting shell (4) has an oil outlet channel 1 (43). The oil pan (1) has a second oil outlet channel (103) and a third oil outlet channel (104). The first oil outlet channel (43) is arranged vertically. The upper end of the first oil outlet channel (43) is connected to the oil outlet of the main oil pump (6). One end of the second oil outlet channel (103) is connected to the lower end of the first oil outlet channel (43). The other end of the second oil outlet channel (103) is connected to one end of the third oil outlet channel (104). An oil filter (8) is arranged in the third oil outlet channel (104).