A lubrication structure for an engine main shaft assembly and a countershaft assembly

Abstract

The present invention provides a lubrication structure for an engine main shaft assembly and a countershaft assembly, belonging to the technical field of engines. It solves the problem of poor lubrication effect of the main shaft assembly and the countershaft assembly of existing engines. This engine includes a box body and a cylinder block fixedly connected to the top of the box body. The main shaft assembly and the countershaft assembly are meshed with each other and installed in the box body. The lubrication structure includes an oil return channel in the cylinder wall of the cylinder block. The oil outlet of the oil return channel penetrates through the inner wall of the box body, and the oil outlet is located directly above the main shaft assembly. There is an arc-shaped oil guiding surface on the inner wall of the box body. The oil guiding surface is located above the countershaft assembly and is arranged close to the countershaft assembly. The arc-shaped notch of the oil guiding surface faces the main shaft assembly. This lubrication structure has the advantage of improving the lubrication effect of the main shaft assembly and the countershaft assembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines and relates to a lubrication structure for the main shaft assembly and the countershaft assembly of an engine. Background Art

[0002] An engine is a machine that can convert other forms of energy into mechanical energy. As the power device of a motorcycle when it is running, when the engine is working, it is necessary to lubricate various components inside the engine with lubricating oil.

[0003] For the existing engine lubrication structure, for example, the Chinese patent literature discloses a lubricating oil cooling system for a motorcycle engine [Application No.: 201020211793.9; Authorization Publication No.: CN201696138U]. The oil inlet of the first chamber of the oil pump communicates with the oil outlet of the primary oil filter, and the oil outlet of the first chamber of the oil pump communicates with the oil inlet of the external oil tank; the first oil outlet of the external oil tank communicates with the oil inlet of the second chamber of the oil pump, and the second oil outlet of the external oil tank communicates with the external oil inlet of the cylinder head; the oil outlet of the second chamber of the oil pump communicates with the oil inlet hole of the oil filter. The crankcase cover oil passage communicated with the oil outlet of the oil filter is divided into two paths. One path communicates with the oil inlet passage of the crankshaft roller needle, and the other path is connected to the oil inlet of the three-way external oil pipe. The first oil outlet of the three-way external oil pipe communicates with the oil holes of the main shaft and the countershaft, and the second oil outlet of the three-way external oil pipe communicates with the camshaft oil passage.

[0004] For the lubricating oil cooling system of this structure, part of the lubricating oil is delivered to the cylinder block through the second oil outlet of the three-way external oil pipe under the action of the oil pump, and then enters the rocker arm chamber of the cylinder head through the cylinder block oil passage, the cylinder head oil passage and the camshaft oil passage. The remaining 1 / 2 of the lubricating oil in the external oil tank enters the rocker arm chamber of the cylinder head through the third external oil pipe to lubricate the cam and the rocker arm, the rocker arm and the push rod or the friction pair of the lower rocker arm and the cam. Subsequently, the above-mentioned lubricating oil directly flows back to the bottom inside the crankcase and is circulated for lubrication again after passing through the oil filter and the oil pump. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems existing in the prior art and propose a lubrication structure for the main shaft assembly and the countershaft assembly of an engine, and the technical problem to be solved is how to improve the lubrication effect of the main shaft assembly and the countershaft assembly.

[0006] The object of the present invention can be achieved by the following technical solutions: A lubrication structure for an engine main shaft assembly and a countershaft assembly. The engine includes a crankcase and a cylinder block fixedly connected to the top of the crankcase. The main shaft assembly and the countershaft assembly are meshed with each other and installed in the crankcase. It is characterized in that the lubrication structure includes an oil return passage in the cylinder wall of the cylinder block. The oil outlet of the oil return passage penetrates the inner wall of the crankcase. The oil outlet is located directly above the main shaft assembly. There is an arc-shaped oil guiding surface on the inner wall of the crankcase. The oil guiding surface is located above the countershaft assembly and is arranged close to the countershaft assembly. The arc-shaped notch of the oil guiding surface faces the main shaft assembly.

[0007] After the lubricating oil for lubricating the components in the engine cylinder flows into the oil return passage, the lubricating oil flows out from the oil outlet of the oil return passage. The oil outlet is located directly above the main shaft assembly. The lubricating oil flows onto the main shaft assembly. The main shaft assembly rotates during operation and is meshed with the countershaft assembly. Therefore, the lubricating oil lubricates the meshing part of the main shaft assembly and the countershaft assembly. Compared with the prior art, the lubricating oil flowing back lubricates the main shaft assembly and the countershaft assembly again, which is equivalent to multiple lubrications, improving the lubrication effect of the main shaft assembly and the countershaft assembly. At the same time, the cooling effect of the main shaft assembly and the countershaft assembly is improved. Since the arc-shaped notch of the oil guiding surface faces the main shaft assembly and the oil guiding surface is located above the countershaft assembly, the rotation of the main shaft assembly will throw part of the lubricating oil tangentially, and the splashed lubricating oil is thrown onto the oil guiding surface. After the lubricating oil on the oil guiding surface accumulates to a certain extent, it will fall onto the countershaft assembly and flow to the meshing part of the main shaft assembly and the countershaft assembly again for lubrication, ensuring the amount of lubricating oil on the countershaft assembly and making the amount of lubricating oil on the main shaft assembly and the countershaft assembly as equal as possible, further improving the lubrication effect of the main shaft assembly and the countershaft assembly.

[0008] In the above-mentioned lubrication structure for an engine main shaft assembly and a countershaft assembly, the oil guiding surface is arranged around the gear of the countershaft assembly. The top of the oil guiding surface is located directly above the countershaft assembly. The distance between the top of the oil guiding surface and the countershaft assembly is greater than the distance between the bottom of the oil guiding surface and the countershaft assembly. This structure enables the main shaft assembly to better throw the lubricating oil onto the oil guiding surface and enables the lubricating oil on the oil guiding surface to better fall onto the countershaft assembly, ensuring the amount of lubricating oil on the countershaft assembly and making the amount of lubricating oil on the main shaft assembly and the countershaft assembly as equal as possible, improving the lubrication effect of the main shaft assembly and the countershaft assembly.

[0009] In the lubrication structure of the above-mentioned engine main shaft assembly and countershaft assembly, a flat oil passing surface is further provided on the inner wall of the box body. One end of the oil passing surface is connected to the oil outlet of the oil return passage, and the other end is connected to the oil guiding surface. The oil passing surface is inclined downward obliquely in the direction from the oil outlet towards the oil guiding surface. In this structure, the oil passing surface plays a transitional role, enabling the oil outlet of the oil return passage to be better connected to the oil guiding surface. Part of the lubricating oil flowing out from the oil outlet of the oil return passage will flow towards the oil guiding surface through the oil passing surface, while facilitating the manufacture of the box body at this location and ensuring sufficient strength.

[0010] In the lubrication structure of the above-mentioned engine main shaft assembly and countershaft assembly, the oil passing surface is located directly above the meshing position of the main shaft assembly and the countershaft assembly. The lubricating oil on the oil passing surface can directly drop into the meshing position between the main shaft assembly and the countershaft assembly, improving the lubrication effect of the main shaft assembly and the countershaft assembly.

[0011] In the lubrication structure of the above-mentioned engine main shaft assembly and countershaft assembly, the inner wall of the box body at the circumferential edge of the oil outlet of the oil return passage bulges downward to form an oil guiding portion, and the oil guiding portion is located directly above the main shaft assembly. The lubricating oil flowing out from the oil outlet of the oil return passage will collide with the oil guiding portion, and the oil guiding portion standardizes the flow direction of the lubricating oil, ensuring that the lubricating oil drops vertically onto the main shaft assembly, improving the lubrication effect of the main shaft assembly and the countershaft assembly.

[0012] In the lubrication structure of the above-mentioned engine main shaft assembly and countershaft assembly, the cross-section of the oil guiding portion in the horizontal direction is in a U shape, and the oil guiding portion has an opening on the side facing the oil guiding surface. When the lubricating oil drops onto the main shaft assembly, part of the lubricating oil will be thrown up by the main shaft assembly. The setting of the opening and the opening facing the oil guiding surface prevent the oil guiding portion from blocking the thrown-up lubricating oil, ensuring that the lubricating oil can be thrown onto the oil guiding surface. At the same time, after the lubricating oil flushed out from the oil outlet of the oil return passage hits the oil guiding portion, part of it will flow from the opening towards the oil guiding surface, ensuring the amount of lubricating oil on the countershaft assembly and making the amount of lubricating oil on the main shaft assembly and the countershaft assembly as equal as possible, improving the lubrication effect of the main shaft assembly and the countershaft assembly.

[0013] In the lubrication structure of the above-mentioned engine main shaft assembly and countershaft assembly, a pair of elongated reinforcing ribs protruding downward are further provided on the inner wall of the box body, and the length direction of the reinforcing ribs is along the direction from the oil guiding portion towards the oil guiding surface. The pair of reinforcing ribs are respectively located on both sides of the opening of the oil guiding portion. The setting of the reinforcing ribs increases the strength of the box body at the oil guiding portion, and at the same time, the reinforcing ribs also play a guiding role, enabling the lubricating oil to flow towards the oil guiding surface in a set direction, ensuring the amount of lubricating oil on the countershaft assembly, and improving the lubrication effect of the main shaft assembly and the countershaft assembly.

[0014] In the lubrication structure of the above-mentioned engine main shaft assembly and countershaft assembly, the oil return passage is inclined downward obliquely in the direction of the countershaft assembly towards the main shaft assembly, and the oil guiding part is arranged vertically downward. The cylinder block is inclined, and this setting method of the oil return passage matches the setting of the cylinder block, and ensures the flow rate of the lubricating oil in the oil return passage; the oil guiding part is arranged vertically downward to ensure that the lubricating oil in the oil return passage falls on the main shaft assembly after flushing out, improving the lubrication effect of the main shaft assembly and the countershaft assembly.

[0015] In the lubrication structure of the above-mentioned engine main shaft assembly and countershaft assembly, the connection line between the main shaft of the main shaft assembly and the countershaft of the countershaft assembly is along the horizontal direction, the overall outer diameter of the main shaft assembly is smaller than the overall outer diameter of the countershaft assembly, the bottom of the oil guiding part is basically flush with the top of the countershaft assembly in the vertical direction, and there is a set distance between the bottom of the oil guiding part and the main shaft assembly. The space is reasonably utilized to enable the oil guiding part to have the best oil guiding effect and not block the lubricating oil thrown out by the main shaft assembly; the meaning of being basically flush is that the height difference between the bottom of the oil guiding part and the top of the countershaft assembly does not exceed one centimeter.

[0016] In the lubrication structure of the above-mentioned engine main shaft assembly and countershaft assembly, an oil pan is fixedly connected to the bottom of the box body, the oil pan is communicated with the cavity inside the box body, and the lubricating oil in the oil pan can be transported to the oil return passage through the oil pump. The lubricating oil in the oil pan is transported to the cylinder block through the oil pump, the lubricating oil lubricates the parts in the cylinder block and then flows into the oil return passage, and then flows along the oil return passage to the main shaft assembly and the countershaft assembly, and finally falls into the oil pan under the action of its own gravity, forming a cycle.

[0017] Compared with the prior art, the lubrication structure of an engine main shaft assembly and a countershaft assembly provided by the present invention has the following advantages:

[0018] 1. This lubrication structure utilizes the lubricating oil in the oil return passage of the engine cylinder to lubricate the main shaft assembly and the countershaft assembly again, which is equivalent to performing multiple lubrications on the main shaft assembly and the countershaft assembly, improving the lubrication effect of the main shaft assembly and the countershaft assembly, and at the same time improving the cooling effect of the main shaft assembly and the countershaft assembly.

[0019] 2. This lubrication structure is provided with an oil guiding part with a U-shaped cross-section at the oil outlet hole of the oil return passage, so that while the lubricating oil falls on the main shaft assembly, it ensures that the oil guiding part does not block the thrown-up lubricating oil, ensures the amount of lubricating oil on the countershaft assembly, makes the amount of lubricating oil on the main shaft assembly and the countershaft assembly as equal as possible, and improves the lubrication effect of the main shaft assembly and the countershaft assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial structural cross-sectional view of this engine.

[0021] Figure 2 It is a schematic diagram of the overall structure of this lubrication structure.

[0022] Figure 3 It is a schematic diagram of the oil guiding part and the reinforcing rib of this lubrication structure.

[0023] In the figure, 1 is the box body; 2 is the cylinder block; 3 is the main shaft assembly; 31 is the main shaft; 4 is the auxiliary shaft assembly; 41 is the gear; 42 is the auxiliary shaft; 5 is the oil return passage; 51 is the oil outlet; 6 is the oil guiding surface; 7 is the oil passing surface; 8 is the oil guiding part; 81 is the opening; 9 is the reinforcing rib; 10 is the oil pan. Specific embodiments

[0024] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0025] As Figure 1 shown, this engine includes a box body 1, a cylinder block 2 fixedly connected to the top of the box body 1, an oil pan 10 fixedly connected to the bottom of the box body 1, and an oil pump arranged in the oil pan 10. The oil pan 10 is communicated with the cavity inside the box body 1. The main shaft assembly 3 and the auxiliary shaft assembly 4 are meshed with each other and installed in the box body 1. The connection line between the main shaft 31 of the main shaft assembly 3 and the auxiliary shaft 42 of the auxiliary shaft assembly 4 is along the horizontal direction, and the overall outer diameter of the main shaft assembly 3 is smaller than the overall outer diameter of the auxiliary shaft assembly 4. The lubrication structure of the engine main shaft assembly 3 and the auxiliary shaft assembly 4 includes an oil return passage 5, an oil guiding surface 6, an oil passing surface 7, and an oil guiding part 8.

[0026] As Figure 2 shown, the oil return passage 5 is located in the cylinder wall of the cylinder block 2. The oil return passage 5 is inclined obliquely downward in the direction of the auxiliary shaft assembly 4 towards the main shaft assembly 3. The oil outlet 51 of the oil return passage 5 penetrates through the inner wall of the box body 1. The inner wall of the box body 1 at the circumferential edge of the oil outlet 51 of the oil return passage 5 bulges downward to form an oil guiding part 8. The oil guiding part 8 is arranged vertically downward. Both the oil outlet 51 and the oil guiding part 8 are directly above the main shaft 31 of the main shaft assembly 3. The bottom of the oil guiding part 8 is basically flush with the top of the auxiliary shaft assembly 4 in the vertical direction. There is a set distance between the bottom of the oil guiding part 8 and the main shaft assembly 3. The cross-section of the oil guiding part 8 in the horizontal direction is in a U shape, and the oil guiding part 8 has an opening 81 on the side facing the oil guiding surface 6.

[0027] On the inner wall of the housing 1, there is an arc-shaped oil guiding surface 6 and a flat oil passing surface 7. The oil passing surface 7 is located between the oil guiding surface 6 and the oil outlet 51 of the oil return passage 5. The oil passing surface 7 is directly above the meshing position of the main shaft assembly 3 and the auxiliary shaft assembly 4. One end of the oil passing surface 7 is connected to the oil outlet 51 of the oil return passage 5, and the other end is connected to the oil guiding surface 6. The oil passing surface 7 is inclined obliquely downward in the direction from the oil outlet 51 towards the oil guiding surface 6. The oil guiding surface 6 is located above the auxiliary shaft assembly 4 and is close to the auxiliary shaft assembly 4. The oil guiding surface 6 is arranged around the gear 41 of the auxiliary shaft assembly 4. The arc-shaped notch of the oil guiding surface 6 faces the main shaft assembly 3. The top of the oil guiding surface 6 is directly above the auxiliary shaft assembly 4, and the distance between the top of the oil guiding surface 6 and the auxiliary shaft assembly 4 is greater than the distance between the bottom of the oil guiding surface 6 and the auxiliary shaft assembly 4.

[0028] As Figure 3 shown, on the inner wall of the housing 1, there are also a pair of downwardly protruding and elongated reinforcing ribs 9. The length direction of the reinforcing ribs 9 is along the direction from the oil guiding part 8 towards the oil guiding surface 6. The pair of reinforcing ribs 9 are respectively located on both sides of the opening 81 of the oil guiding part 8, and there is a set distance between the pair of reinforcing ribs 9 and the oil guiding part 8.

[0029] During operation, part of the lubricating oil in the oil pan 10 is delivered to the cylinder block 2 by the oil pump to lubricate the components in the cylinder block 2. This part of the lubricating oil then flows into the oil return passage 5, and then lubricates the main shaft assembly 3 and the auxiliary shaft assembly 4 through the cooperation of the oil outlet 51, the oil guiding part 8, the oil passing surface 7 and the oil guiding surface 6. Finally, under the action of its own gravity, the lubricating oil drops back into the oil pan 10. At the same time, part of the lubricating oil in the oil pan 10 is delivered to the main shaft 31 oil passage in the main shaft assembly 3 and the auxiliary shaft 42 oil passage in the auxiliary shaft assembly 4 by the oil pump. When the main shaft 31 and the auxiliary shaft 42 rotate, the lubricating oil is thrown out from the oil holes to lubricate the main shaft assembly 3 and the auxiliary shaft assembly 4. Finally, under the action of its own gravity, the lubricating oil drops back into the oil pan 10.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0031] Although terms such as housing 1, cylinder block 2, main shaft assembly 3, main shaft 31, auxiliary shaft assembly 4, gear 41, auxiliary shaft 42, oil return passage 5, oil outlet 51, oil guiding surface 6, oil passing surface 7, oil guiding part 8, opening 81, reinforcing rib 9, oil pan 10, etc. are used more in this article, the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A lubrication structure for a main shaft assembly and a countershaft assembly of an engine. The engine includes a crankcase (1) and a cylinder block (2) fixedly connected to the top of the crankcase (1). The main shaft assembly (3) and the countershaft assembly (4) are meshed with each other and installed in the crankcase (1), characterized in that, The lubrication structure includes an oil return passage (5) in the cylinder wall of the cylinder block (2). The oil outlet (51) of the oil return passage (5) penetrates through the inner wall of the box body (1). The oil outlet (51) is located directly above the main shaft assembly (3). There is an arc-shaped oil guiding surface (6) on the inner wall of the box body (1). The oil guiding surface (6) is located above and close to the countershaft assembly (4). The arc-shaped notch of the oil guiding surface (6) faces the main shaft assembly (3). The oil guiding surface (6) is arranged around the gear (41) of the countershaft assembly (4). The top of the oil guiding surface (6) is located directly above the countershaft assembly (4). The distance between the top of the oil guiding surface (6) and the countershaft assembly (4) is greater than the distance between the bottom of the oil guiding surface (6) and the countershaft assembly (4). There is also a flat oil passing surface (7) on the inner wall of the box body (1). One end of the oil passing surface (7) is connected to the oil outlet (51) of the oil return passage (5), and the other end is connected to the oil guiding surface (6). The oil passing surface (7) is inclined obliquely downward along the direction from the oil outlet (51) towards the oil guiding surface (6). The oil passing surface (7) is located directly above the meshing position of the main shaft assembly (3) and the countershaft assembly (4). The inner wall of the box body (1) at the circumferential edge of the oil outlet (51) of the oil return passage (5) bulges downward to form an oil guiding part (8). The oil guiding part (8) is located directly above the main shaft assembly (3). The cross-section of the oil guiding part (8) along the horizontal direction is in a U shape. The side of the oil guiding part (8) facing the oil guiding surface (6) has an opening (81). The oil return passage (5) is inclined obliquely downward along the direction from the countershaft assembly (4) towards the main shaft assembly (3). The oil guiding part (8) is arranged vertically downward. The connection line between the main shaft (31) of the main shaft assembly (3) and the countershaft (42) of the countershaft assembly (4) is along the horizontal direction. The overall outer diameter of the main shaft assembly (3) is smaller than the overall outer diameter of the countershaft assembly (4). The bottom of the oil guiding part (8) is basically flush with the top of the countershaft assembly (4) in the vertical direction. There is a set distance between the bottom of the oil guiding part (8) and the main shaft assembly (3). An oil pan (10) is fixedly connected to the bottom of the box body (1). The oil pan (10) is connected to the cavity inside the box body (1). An oil pump is arranged in the oil pan (10). During operation, a part of the lubricating oil in the oil pan (10) is transported to the cylinder block (2) by the oil pump to lubricate the components in the cylinder block (2). This part of the lubricating oil then flows into the oil return passage (5), and then lubricates the main shaft assembly (3) and the countershaft assembly (4) through the cooperation of the oil outlet (51), the oil guiding part (8), the oil passing surface (7) and the oil guiding surface (6). Finally, under the action of its own gravity, the lubricating oil drops back into the oil pan (10). At the same time, a part of the lubricating oil in the oil pan (10) is transported to the main shaft oil passage in the main shaft (31) of the main shaft assembly (3) and the countershaft oil passage in the countershaft (42) of the countershaft assembly (4) by the oil pump.When the main shaft (31) and the auxiliary shaft (42) rotate, lubricating oil is thrown out from the oil holes to lubricate the main shaft assembly (3) and the auxiliary shaft assembly (4). Finally, under the action of its own gravity, the lubricating oil falls back into the oil pan (10).

2. The lubrication structure of an engine main shaft assembly and a countershaft assembly according to claim 1, characterized in that, The inner wall of the box body (1) further has a pair of downwardly protruding and strip-shaped reinforcing ribs (9), the length direction of the reinforcing ribs (9) is along the direction from the oil guiding part (8) towards the oil guiding surface (6), and the pair of reinforcing ribs (9) are respectively located on both sides of the opening (81) of the oil guiding part (8).

Images