Lubricating system and lubricating method of four-stroke engine
By designing a lubrication system for radial oil inlet and axial oil outlet on the crankshaft in a four-stroke engine, the problem of difficult oil input in traditional systems is solved, precise lubrication is achieved, and lubrication efficiency and system stability are improved. .
Patent Information
- Application Number
- CN202411548596.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2024-12-17
AI Technical Summary
Traditional four-stroke engine lubrication systems are difficult to accurately control the input amount and timing of the engine oil, resulting in insufficient or excessive lubrication, affecting engine performance.
A lubrication system including a radial oil inlet hole and an axial oil outlet hole is designed on the crankshaft. The intermittent penetration of the radial oil inlet hole and the oil inlet pipeline when the crankshaft rotates is achieved to achieve accurate oil inlet of engine oil and through The check valve and return line ensure effective circulation of lubricating oil.
Accurate oil inlet of engine oil, improve lubrication efficiency, reduce circulation burden caused by excessive or insufficient oil inlet, and ensure the stability and reliability of the lubrication system.
Smart Images
Figure CN119145935A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of engine lubrication systems, and in particular to a lubrication system and a lubrication method for a four-stroke engine. Background Art
[0002] Four-stroke engines are widely used in various mechanical equipment and vehicles due to their good emission performance. As an indispensable part of four-stroke engines, the lubrication system transports the oil in the oil chamber (oil pan) to various moving parts through the circulating oil circuit to achieve effective lubrication, thereby reducing wear, improving working smoothness and extending the service life of the engine.
[0003] In the first process of the lubrication system, the oil in the oil chamber needs to be injected into the upper and lower boxes. The traditional lubrication system generally uses negative pressure or a pressure pump to extract the oil from the oil chamber through the pipeline and deliver it to the parts that need lubrication through specially designed oil channels. However, this traditional lubrication system has some limitations in actual work, such as it is difficult to accurately control the amount and timing of oil input. If too much oil is input, it may increase the circulation burden of the lubrication system; conversely, if the oil is insufficient, it may lead to insufficient lubrication, which in turn affects engine performance.
[0004] The above contents are only used to assist in understanding the technical solution of the present application, and do not constitute an admission that the above contents are the closest prior art to the present application. Summary of the invention
[0005] Based on this, the present 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 the present application to solve the technical problem is: a lubrication system for a four-stroke engine, comprising: Oil chamber; The upper and lower boxes include a lower shell and an upper shell, wherein the lower shell is connected to the oil chamber, and the upper shell is connected to the valve chamber; The crank-connecting rod mechanism includes a piston, a connecting rod and a crankshaft. The piston moves up and down in the cylinder, and the connecting rod converts the linear motion into the rotational motion of the crankshaft. The crankshaft is provided with a first timing gear, a second timing gear is provided above the first timing gear, and a cam, a rocker arm, and a push rod driven by the second timing gear; An oil inlet pipeline, at least a portion of which is disposed through the lower housing and another portion of which extends into the oil chamber; an oil outlet pipeline formed in the lower housing, with an outlet thereof close to the first timing gear; A one-way valve is installed at the oil outlet pipeline to control the opening and closing of the oil outlet pipeline; The oil return pipeline is arranged in the upper and lower boxes and is used to connect the valve chamber and the oil chamber; Among them, an oil circuit is opened on the crankshaft, and the oil circuit includes a radial oil inlet hole and an axial oil outlet hole that are connected to each other. When the crankshaft rotates, the radial oil inlet hole can intermittently communicate with the oil inlet pipeline to achieve precise oil supply.
[0007] In some embodiments, the oil chamber is disposed below the lower shell, an inlet of an oil outlet pipeline is disposed at the bottom of the lower shell, and the one-way valve is disposed at the inlet.
[0008] In some embodiments, the lower shell includes a flow chamber, which connects the inlet and outlet of the oil outlet pipeline. The one-way valve is a valve plate, which is used to seal the inlet or open the inlet after being deformed by pressure.
[0009] In some embodiments, an outlet of the oil inlet pipeline is formed on the lower shell body, and 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, and the connecting hose is interference-sleeved on the outlet connector. The gravity ball head is arranged at the lower end of the connecting hose and formed with a through hole.
[0010] In some embodiments, the lower shell and the upper shell of the upper and lower boxes are respectively formed with a first part and a second part of the oil return pipeline, and the connection between the first part and the second part remains sealed and connected.
[0011] In some embodiments, the valve chamber includes a partition, a condensation chamber is formed between the partition and the valve chamber top cover, and a plurality of through holes and an oil return port connected to an oil return pipeline are provided on the partition.
[0012] In some embodiments, the oil return port is disposed at an end corner of the partition.
[0013] In some embodiments, the valve chamber is provided with a breather pipe connected to the carburetor, and the breather pipe is arranged below the partition.
[0014] Another aspect of the present application provides a lubrication method for a four-stroke engine, using the lubrication system described in any of the above embodiments, and the working process is as follows: Step 1: The piston moves upward, at which time the one-way valve is in a closed state, and negative pressure is formed in the crankcase. After the crankshaft rotates, the radial oil inlet hole is connected with the oil inlet pipeline, and the oil in the oil chamber is sucked into the crankcase by the negative pressure; Step 2: The piston moves downward, and pressure is generated in the crankcase, which opens the one-way valve at the oil outlet pipeline, and presses the oil into the first timing gear through the oil outlet pipeline, lubricating the gear while forming oil mist that enters the valve chamber; Step 3: The oil mist in the valve chamber is condensed, and the oil flows back to the oil chamber through the oil return pipeline. The gas enters the combustion chamber through the carburetor and is burned and then discharged into the atmosphere; Step 4: Repeat the above steps.
[0015] The beneficial effects of the present application are as follows: by arranging a specific oil circuit design on the crankshaft, accurate oil intake is achieved, avoiding the problems caused by the difficulty in controlling the oil intake amount in the traditional system; by utilizing the intermittent connection between the radial oil inlet hole and the oil inlet pipeline when the crankshaft rotates, it is ensured that the engine oil enters the crankcase at the right time, thereby improving the lubrication efficiency; by precisely controlling the oil intake amount, the circulation burden caused by excessive oil intake is reduced, and at the same time, the problem of insufficient lubrication caused by insufficient oil intake is avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 It is a schematic diagram of the appearance structure of this application.
[0018] Figure 2 It is a schematic diagram of the appearance structure of the hidden upper shell of the present application.
[0019] Figure 3 It is a cross-sectional view of the internal structure of this application.
[0020] Figure 4 It is a schematic diagram of the lower shell structure of the present application.
[0021] Figure 5 It is a cross-sectional view of the lower shell of the present application.
[0022] Figure 6 It is a schematic diagram of the upper shell structure of the present application.
[0023] Figure 7 This is a schematic diagram of the structure of the upper shell of the present application from another angle.
[0024] Figure 8 It is a schematic diagram of the valve chamber structure of the present application.
[0025] Description of the reference numerals: 1. Oil chamber, 2. Upper and lower boxes, 2. Lower shell, 2. 1. Flow chamber, 22. Upper shell, 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, 4. Oil inlet pipeline, 41. Outlet connector, 42. Connecting hose, 43. Gravity ball head, 5. Oil outlet pipeline, 6. One-way valve, 7. Oil return line, 71. First part, 72. Second part, 8. Valve chamber, 81. Partition, 82. Through hole, 83. Oil return port, 84. Ventilation pipe 9. Carburetor. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection of this application.
[0027] Please refer to Figure 1-8 As shown, the present application proposes a lubrication system for a four-stroke engine, comprising: Oil chamber: used to store lubricating oil.
[0028] Upper and lower housings: include a lower housing and an upper housing, wherein the lower housing is connected to the oil chamber, and the upper housing is connected to the valve chamber.
[0029] Crank-connecting rod mechanism: includes piston, connecting rod and crankshaft. The piston moves up and down in the cylinder, and the connecting rod converts the linear motion into the rotational motion of the crankshaft.
[0030] First timing gear and second timing gear: The crankshaft is provided with a first timing gear, and the second timing gear is provided above the first timing gear, as well as a cam, a rocker arm, and a push rod driven by the second timing gear.
[0031] Oil inlet pipeline: at least a portion of which is arranged through the lower shell body, and another portion of which extends into the oil chamber.
[0032] An oil outlet pipeline is formed in the lower housing, and an outlet thereof is close to the first timing gear.
[0033] One-way valve: installed in the oil outlet pipeline to control the opening and closing of the oil outlet pipeline.
[0034] Oil return pipeline: installed in the upper and lower boxes, used to connect the valve chamber and the oil chamber.
[0035] Among them, an oil circuit is opened on the crankshaft, and the oil circuit includes a radial oil inlet hole and an axial oil outlet hole that are connected to each other. When the crankshaft rotates, the radial oil inlet hole can intermittently communicate with the oil inlet pipeline to achieve precise oil supply.
[0036] Some preferred / improved embodiments based on the above embodiments will be described below. Any one of the following embodiments may be selected, or multiple embodiments may be selected and combined.
[0037] Regarding the setting of the oil chamber: In some embodiments, the oil chamber is set below the lower shell, the bottom of the lower shell is provided with an inlet of the oil outlet pipeline, and the one-way valve is set at the inlet. In this way, by setting the oil chamber below the lower shell and providing the inlet of the oil outlet pipeline at the bottom of the lower shell, in conjunction with the one-way valve, the input of lubricating oil can be effectively controlled to avoid excessive or insufficient oil inflow, thereby ensuring the stability and reliability of the lubrication system.
[0038] In some embodiments, the lower housing includes a circulation chamber, the circulation chamber connects the inlet and outlet of the oil outlet pipeline, and the one-way valve is a valve plate, the valve plate 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 lubricating oil in and out of the oil pipeline, and 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.
[0039] In some embodiments, the lower housing is formed with an outlet of the oil inlet pipeline, 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. In this way, the outlet design of the oil inlet pipeline ensures that the lubricating oil can flow smoothly into the upper and lower boxes, and through the setting of the gravity ball head, the normal supply of lubricating oil can be guaranteed even when the engine is tilted, thereby improving the adaptability of the lubrication system.
[0040] In some embodiments, the lower shell and the upper shell of the upper and lower boxes are respectively formed with a first part and a second part of the oil return pipeline, and the connection between the first part and the second part is kept sealed and connected. By dividing the oil return pipeline into two parts and ensuring that the connection is sealed and connected, the lubricating oil can be effectively guided from the valve chamber back to the oil chamber, ensuring the closedness of the system and preventing the leakage of the lubricating oil.
[0041] Regarding the valve chamber structure: In some embodiments, the valve chamber includes a baffle, a condensation chamber is formed between the baffle and the valve chamber top cover, the baffle is provided with a plurality of through holes and an oil return port connected to the oil return pipeline, and a labyrinth condensation channel is also provided at the lower part of the condensation chamber. The design of the condensation chamber is conducive to the condensation recovery of the lubricating oil. Through the through holes and the oil return port on the baffle, the lubricating oil can be effectively recovered to the oil chamber, thereby improving the recycling rate of the lubricating oil.
[0042] In some embodiments, the oil return port is disposed at an end corner of the partition. By disposing the oil return port at an end corner of the partition, gravity and the negative pressure generated in the oil chamber when the crankshaft sucks oil can be better utilized to ensure that the lubricating oil can smoothly return to the oil chamber and reduce the residual lubricating oil in the valve chamber.
[0043] In some embodiments, the valve chamber is provided with a vent pipe connected to the carburetor, and the vent pipe is provided below the partition. By providing a vent pipe connected to the carburetor, the excess gas in the valve chamber can be discharged into the carburetor and then discharged into the atmosphere after combustion, thereby avoiding the influence of gas accumulation on the circulation of the lubrication system and also helping to improve the emission performance of the engine.
[0044] Another aspect of the present application provides a lubrication method for a four-stroke engine, using the lubrication system described in any of the above embodiments, and the working process is as follows: Step 1: The piston moves upward, at which time the one-way valve is in a closed state, and negative pressure is formed in the crankcase. After the crankshaft rotates, the radial oil inlet hole and the oil inlet pipeline are connected, and the oil in the oil chamber is sucked into the crankcase through the negative pressure.
[0045] Step 2: The piston moves downward, and pressure is formed in the crankcase, which opens the one-way valve at the oil outlet line. The oil is pressed into the first timing gear through the oil outlet line, lubricating the gear while forming oil mist that enters the valve chamber to lubricate other parts.
[0046] Step 3: The oil mist in the valve chamber is condensed, and the oil flows back to the oil chamber through the oil return pipeline. The gas enters the combustion chamber through the carburetor and is burned and then discharged into the atmosphere.
[0047] Step 4: Repeat the above steps.
[0048] 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 known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.
[0049] Finally, it should be noted that the above is only a preferred embodiment of the present application, and the aforementioned embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A lubrication system for a four-stroke engine, characterized in that: include: Oil chamber; The upper and lower boxes include a lower shell and an upper shell, wherein the lower shell is connected to the oil chamber, and the upper shell is connected to the valve chamber; The crank-connecting rod mechanism includes a piston, a connecting rod and a crankshaft. The piston moves up and down in the cylinder, and the connecting rod converts the linear motion into the rotational motion of the crankshaft. The crankshaft is provided with a first timing gear, a second timing gear is provided above the first timing gear, and a cam, a rocker arm, and a push rod driven by the second timing gear; An oil inlet pipeline, at least a portion of which is disposed through the lower housing and another portion of which extends into the oil chamber; an oil outlet pipeline formed in the lower housing, with an outlet thereof close to the first timing gear; A one-way valve is installed at the oil outlet pipeline to control the opening and closing of the oil outlet pipeline; The oil return pipeline is arranged in the upper and lower boxes and is used to connect the valve chamber and the oil chamber; Among them, an oil circuit is opened on the crankshaft, and the oil circuit includes a radial oil inlet hole and an axial oil outlet hole that are connected to each other. When the crankshaft rotates, the radial oil inlet hole can intermittently communicate with the oil inlet pipeline to achieve precise oil supply.
2. A lubrication system for a four-stroke engine according to claim 1, characterized in that: The oil chamber is arranged below the lower shell, the bottom of the lower shell is provided with an inlet of the oil outlet pipeline, and the one-way valve is arranged at the inlet.
3. A lubrication system for a four-stroke engine according to claim 2, characterized in that: The lower shell includes a flow chamber, which connects the inlet and the outlet of the oil outlet pipeline. The one-way valve is a valve plate, which is used to seal the inlet or open the inlet after being deformed by pressure.
4. A lubrication system for a four-stroke engine according to claim 1, characterized in that: An outlet of the oil inlet pipeline is formed on the lower shell body, and 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 formed with a through hole.
5. A lubrication system for a four-stroke engine according to claim 1, characterized in that: The lower shell and the upper shell of the upper and lower boxes are respectively formed with a first part and a second part of the oil return pipeline, and the connection between the first part and the second part is kept sealed and connected.
6. A lubrication system for a four-stroke engine according to claim 1, characterized in that: The valve chamber comprises a partition plate, a condensation chamber is formed between the partition plate and the valve chamber top cover, and a plurality of through holes and an oil return port connected to an oil return pipeline are arranged on the partition plate.
7. A lubrication system for a four-stroke engine according to claim 6, characterized in that: The oil return port is arranged at an end corner of the partition.
8. A lubrication system for a four-stroke engine according to claim 6, characterized in that: The valve chamber is provided with a vent pipe connected to the carburetor, and the vent pipe is arranged below the partition.
9. A method for lubricating a four-stroke engine, using the lubrication system as claimed in any one of claims 1 to 8, characterized in that: The workflow is as follows: Step 1: The piston moves upward, at which time the one-way valve is in a closed state, and negative pressure is formed in the crankcase. After the crankshaft rotates, the radial oil inlet hole is connected with the oil inlet pipeline, and the oil in the oil chamber is sucked into the crankcase by the negative pressure; Step 2: The piston moves downward, and pressure is generated in the crankcase, which opens the one-way valve at the oil outlet pipeline, and presses the oil into the first timing gear through the oil outlet pipeline, lubricating the gear while forming oil mist that enters the valve chamber; Step 3: The oil mist in the valve chamber is condensed, and the oil flows back to the oil chamber through the oil return pipeline. The gas enters the combustion chamber through the carburetor and is burned and then discharged into the atmosphere; Step 4: Repeat the above steps.