Circulating lubricating oil mechanism of four-stroke engine

Abstract

The utility model discloses a circulating lubricating oil mechanism of a four-stroke engine. The circulating lubricating oil mechanism comprises an oil chamber; the box body comprises a lower box body and an upper box body, the lower box body is connected with the oil chamber, and the upper box body is connected with the valve chamber; a crank-link mechanism; at least one part of the oil inlet pipeline is arranged in the lower box body in a penetrating manner, and the other part of the oil inlet pipeline extends into the oil chamber; the oil outlet pipeline is formed in the lower box body; the oil return pipeline is arranged in the upper and lower tank bodies and is used for communicating the valve chamber with the oil chamber; wherein a first part and a second part of an oil return pipeline are respectively formed on the lower box body and the upper box body, and the joint of the first part and the second part is kept sealed and communicated; during working, oil in the oil chamber sequentially passes through the oil inlet pipeline and the oil outlet pipeline and flows back through the oil return pipeline to form circulation.

Description

Technical Field

[0001] This application relates to the technical field of engine lubrication systems, and particularly to a circulating lubricating oil mechanism for a four-stroke engine. Background Art

[0002] Due to its good emission performance and reliability, four-stroke engines have been widely used in various mechanical equipment and vehicles. As an indispensable part of a four-stroke engine, the lubrication system transports the engine oil in the oil chamber (oil pan) to each moving part through a circulating oil path to achieve effective lubrication, thereby reducing wear, improving working smoothness, and extending the service life of the engine.

[0003] The existing lubricating oil mechanisms still have the following defects: The oil path design is not reasonable enough, the stroke is relatively long, and the connection between each box body is not well utilized for reasonable layout.

[0004] The above content is only used to assist in understanding the technical solution of this application, and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0005] Based on this, this application provides a lubrication system and a lubrication method for a four-stroke engine to solve the defects of the prior art.

[0006] The technical solution adopted by this application to solve its technical problems is: A circulating lubricating oil mechanism for a four-stroke engine, characterized by comprising:

[0007] An oil chamber;

[0008] A box body, including a lower box body and an upper box body, the lower box body is connected to the oil chamber, and the upper box body is connected to the valve chamber;

[0009] A crank connecting rod mechanism, including a piston, a connecting rod, and a crankshaft. The piston moves up and down in the cylinder, and the linear motion is converted into the rotational motion of the crankshaft through the connecting rod;

[0010] An oil inlet pipeline, at least a part of which is arranged through the lower box body, and the other part extends into the oil chamber;

[0011] An oil outlet pipeline, formed in the lower box body;

[0012] An oil return pipeline, arranged in the box body for connecting the valve chamber and the oil chamber;

[0013] Wherein, the first part and the second part of the oil return pipeline are respectively formed on the lower box body and the upper box body, and the connection part of the first part and the second part is kept sealed and through;

[0014] During operation, the oil in the oil chamber sequentially passes through the oil inlet pipeline, the oil outlet pipeline, and returns through the oil return pipeline to form a cycle.

[0015] In some embodiments, an oil passage is provided in the crankshaft. The oil passage includes a radially extending oil inlet hole and an axially extending oil outlet hole that communicate with each other. When the crankshaft rotates, the radially extending oil inlet hole can intermittently communicate with the oil inlet pipeline to achieve precise oil inlet.

[0016] In some embodiments, a one-way valve is further included, which is disposed at the oil outlet pipeline and is used to control the opening and closing of the oil outlet pipeline.

[0017] In some embodiments, the oil chamber is disposed below the lower housing. An inlet of the oil outlet pipeline is provided at the bottom of the lower housing, and the one-way valve is disposed at the inlet.

[0018] In some embodiments, an outlet of the oil inlet pipeline is formed on the lower housing. The oil inlet pipeline includes an outlet connector, a connecting hose, and a gravity ball head. The outlet connector is embedded below the outlet of the oil inlet pipeline. The connecting hose is press-fitted over the outlet connector, and the gravity ball head is disposed at the lower end of the connecting hose and is formed with a through hole.

[0019] In some embodiments, the valve chamber includes a partition plate. A condensation chamber is formed between the partition plate and the valve chamber top cover. A labyrinth channel is disposed below the condensation chamber. A plurality of through holes and an oil return port connected to an oil return pipeline are provided on the partition plate.

[0020] In some embodiments, a ventilation pipe communicating with a carburetor is provided in the valve chamber, and the ventilation pipe is disposed below the partition plate.

[0021] The beneficial effects of the present application are as follows: First, a new circulating lubricating oil mechanism is provided, and the circulating oil path is rationally designed. The sealing connection between the upper housing and the lower housing is used to achieve the penetration of the oil return pipeline, simplifying the oil return stroke and improving the oil return efficiency.

[0022] Secondly, through the specific oil passage design provided on the crankshaft, precise oil inlet of the engine oil is achieved, avoiding the problems caused by the difficult control of the oil inlet amount in the traditional system; by using the intermittent penetration of the radially extending oil inlet hole and the oil inlet pipeline when the crankshaft rotates, it is ensured that the engine oil enters the housing at the appropriate time, improving the lubrication efficiency; by precisely controlling the oil inlet amount, the circulating burden caused by excessive oil inlet is reduced, and at the same time, the problem of insufficient lubrication caused by insufficient oil inlet is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic diagram of the external structure of this application.

[0025] Figure 2 It is a schematic diagram of the external structure of the hidden upper housing of this application.

[0026] Figure 3 It is a cross-sectional view of the internal structure of this application.

[0027] Figure 4 It is a schematic diagram of the lower housing structure of this application.

[0028] Figure 5 It is a cross-sectional view of the lower housing of this application.

[0029] Figure 6 It is a schematic diagram of the upper housing structure of this application.

[0030] Figure 7 It is a schematic diagram of the upper housing structure from another angle of this application.

[0031] Figure 8 It is a schematic diagram of the valve chamber structure of this application.

[0032] Explanation of the reference numerals in the drawings: 1. Oil chamber, 2. Box body, 21. Lower housing, 211. Flow-through chamber,

[0033] 22. Upper housing,

[0034] 31. Piston, 32. Connecting rod, 33. Crankshaft, 331. Radial oil inlet hole, 332. Axial oil outlet hole, 34. First timing gear, 35. Second timing gear, 36. Cam, 37. Rocker arm, 38. Push rod,

[0035] 4. Oil inlet pipeline, 41. Outlet connector, 42. Connecting hose, 43. Gravity ball head,

[0036] 5. Oil outlet pipeline,

[0037] 6. Check valve,

[0038] 7. Oil return pipeline, 71. First part, 72. Second part,

[0039] 8. Valve chamber, 81. Partition board, 82. Through hole, 83. Oil return port, 84. Air pipe

[0040] 9. Carburetor. Detailed implementation manners

[0041] Next, in combination with the accompanying drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection of the present application.

[0042] Please refer to Figure 1-8 as shown, the present application proposes a circulating lubricating mechanism for a four-stroke engine, including:

[0043] Oil chamber: used to store lubricating oil.

[0044] Box body: including a lower housing and an upper housing, the lower housing is connected to the oil chamber, and the upper housing is connected to the valve chamber.

[0045] Crankshaft connecting rod mechanism: including a piston, a connecting rod and a crankshaft. The piston moves up and down in the cylinder, and the linear motion is converted into the rotational motion of the crankshaft through the connecting rod.

[0046] First timing gear and second timing gear: a first timing gear is arranged on the crankshaft, a second timing gear is arranged above the first timing gear, and a cam, a rocker arm and a push rod driven by the second timing gear.

[0047] Oil inlet pipeline: at least a part of it is arranged through the lower housing, and the other part extends into the oil chamber.

[0048] Oil outlet pipeline: formed in the lower housing, and its outlet is close to the first timing gear.

[0049] Check valve: arranged at the oil outlet pipeline to control the opening and closing of the oil outlet pipeline.

[0050] Oil return pipeline: arranged in the box body to connect the valve chamber and the oil chamber.

[0051] Next, some preferred / improved embodiments based on the above embodiments will be further elaborated. Any one or a combination of multiple of the following embodiments can be selected.

[0052] Regarding the setting of the oil chamber: In some embodiments, the oil chamber is disposed below the lower housing. An inlet of the oil outlet pipeline is provided at the bottom of the lower housing, and the one-way valve is disposed at the inlet. Thus, by disposing the oil chamber below the lower housing, providing an inlet of the oil outlet pipeline at the bottom of the lower housing, and cooperating with the one-way valve, the input of the lubricating oil can be effectively controlled, avoiding excessive or insufficient oil inlet, and ensuring the stability and reliability of the lubrication system.

[0053] In some embodiments, the lower housing includes a circulation chamber that connects the inlet and the outlet of the oil outlet pipeline. The one-way valve is a valve plate that is used to seal the inlet or open the inlet after being deformed by pressure. The design of the circulation chamber ensures the smooth flow of the lubricating oil when entering and leaving the oil pipeline. The setting of the one-way valve further ensures that the lubricating oil can only flow in one direction, preventing backflow and improving the safety of the system.

[0054] In some embodiments, an outlet of the oil inlet pipeline is formed on the lower housing. The oil inlet pipeline includes an outlet connector, a connecting hose, and a gravity ball head. The outlet connector is embedded below the outlet of the oil inlet pipeline. The connecting hose is press-fitted on the outlet connector, and the gravity ball head is disposed at the lower end of the connecting hose and is formed with a through hole. Thus, the design of the outlet of the oil inlet pipeline ensures that the lubricating oil can flow smoothly into the box body, and through the setting of the gravity ball head, even when the engine is tilted, the normal supply of the lubricating oil can be ensured, improving the adaptability of the lubrication system.

[0055] In some embodiments, the first part and the second part of the oil return pipeline are respectively formed on the lower housing and the upper housing of the box body. The connection part between the first part and the second part is kept sealed and through. By dividing the oil return pipeline into two parts and ensuring that the connection part is sealed and through, the lubricating oil can be effectively guided from the valve chamber back to the oil chamber, ensuring the sealing of the system and preventing the leakage of the lubricating oil.

[0056] Regarding the valve chamber structure: In some embodiments, the valve chamber includes a partition board. A condensation chamber is formed between the partition board and the valve chamber top cover. A plurality of through holes and an oil return port connecting the oil return pipeline are provided on the partition board. The design of the condensation chamber helps the condensation and recovery of the lubricating oil. Through the through holes and the oil return port on the partition board, the lubricating oil can be effectively recovered to the oil chamber, improving the recycling rate of the lubricating oil.

[0057] In some embodiments, the oil return port is disposed at one end corner of the partition board. By disposing the oil return port at one end corner of the partition board, the self-gravity and the negative pressure in the oil chamber (negative pressure is generated in the oil chamber when the crankshaft sucks oil) can be better utilized to ensure that the lubricating oil can flow smoothly back to the oil chamber and reduce the residue of the lubricating oil in the valve chamber.

[0058] In some embodiments, an air pipe communicating with a carburetor is provided in the valve chamber, and the air pipe is disposed below the partition plate. By providing the air pipe communicating with the carburetor, the redundant gas in the valve chamber can be discharged into the carburetor, and after combustion, it is discharged into the atmosphere, avoiding the influence of gas accumulation on the lubrication system circulation, and also helping to improve the emission performance of the engine.

[0059] On the other hand, the present application provides a lubrication method for a four-stroke engine, using the lubrication system described in any of the above embodiments, and its working process is as follows:

[0060] Step 1: The piston moves upward. At this time, the check valve is in a closed state, a negative pressure is formed in the box body, and after the crankshaft rotates, the radial oil inlet hole communicates with the oil inlet pipeline, and the oil in the oil chamber is sucked into the box body through the negative pressure.

[0061] Step 2: The piston moves downward, a pressure is formed in the box body, the check valve at the oil outlet pipeline is opened, and the oil is pressed into the first timing gear through the oil outlet pipeline. While lubricating the gear, an oil mist is formed and enters the valve chamber to lubricate other parts.

[0062] Step 3: The oil mist in the valve chamber condenses, the oil flows back to the oil chamber through the oil return pipeline, and the gas enters the combustion chamber through the carburetor, burns and then is discharged into the atmosphere.

[0063] Step 4: Repeat the above steps.

[0064] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0065] Finally, it should be noted that the above are only the preferred embodiments of the present application. The foregoing embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. The circulating lubrication mechanism of a four-stroke engine, characterized in that, Comprising: An oil chamber; A box body, including a lower box body and an upper box body, the lower box body is connected to the oil chamber, and the upper box body is connected to the valve chamber; A crank connecting rod mechanism, including a piston, a connecting rod and a crankshaft, the piston moves up and down in the cylinder, and the linear motion is converted into the rotational motion of the crankshaft through the connecting rod; An oil inlet pipeline, at least a part of which is arranged through the lower box body, and the other part extends into the oil chamber; An oil outlet pipeline, formed in the lower box body; An oil return pipeline, arranged in the box body and used to connect the valve chamber and the oil chamber; Wherein, the first part and the second part of the oil return pipeline are respectively formed on the lower box body and the upper box body, and the connection part of the first part and the second part is kept sealed and through; During operation, the oil in the oil chamber sequentially passes through the oil inlet pipeline, the oil outlet pipeline, and returns through the oil return pipeline to form a cycle.

2. The circulating lubricating mechanism of the four-stroke engine according to claim 1, characterized in that, Wherein, An oil passage is formed on the crankshaft, the oil passage includes a radially communicating oil inlet hole and an axially communicating oil outlet hole, when the crankshaft rotates, the radially communicating oil inlet hole can be intermittently communicated with the oil inlet pipeline to achieve precise oil inlet.

3. The circulating lubrication mechanism of the four-stroke engine according to claim 1, characterized in that, It further includes a check valve, arranged at the oil outlet pipeline and used to control the opening and closing of the oil outlet pipeline.

4. The circulating lubricating oil mechanism of the four-stroke engine according to claim 3, characterized in that, The oil chamber is arranged below the lower box body, an inlet of the oil outlet pipeline is arranged at the bottom of the lower box body, and the check valve is arranged at the inlet.

5. The circulating lubricating oil mechanism of the four-stroke engine according to claim 1, characterized in that, An outlet of the oil inlet pipeline is formed on the lower box body, the oil inlet pipeline includes an outlet connector, a connecting hose and a gravity ball head, the outlet connector is embedded below the outlet of the oil inlet pipeline, the connecting hose is interference-fitted on the outlet connector, and the gravity ball head is arranged at the lower end of the connecting hose and is formed with a through hole.

6. The circulating lubricating oil mechanism of the four-stroke engine according to claim 1, characterized in that, The valve chamber includes a partition board, a condensation chamber is formed between the partition board and the valve chamber top cover, a labyrinth channel is arranged below the condensation chamber, and a plurality of through holes and an oil return port connecting the oil return pipeline are arranged on the partition board.

7. The circulating lubricating oil mechanism of the four-stroke engine according to claim 6, characterized in that, The valve chamber is provided with a ventilation pipe communicating with the carburetor, and the air pipe is arranged below the partition board.

Images