Oil-gas separation structure of engine
By setting up partitions and condensation chambers in the valve chamber of a four-stroke engine, combined with the oil return pipeline and a check valve design, the problem of unstable oil separation in the lubrication system is solved, and efficient lubricant recovery and fuel economy are achieved.
Patent Information
- Application Number
- CN202422752785.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-11-12
AI Technical Summary
There is a lack of a stable and reliable oil-gas separation mechanism in the existing four-stroke engine lubrication system, which causes more oil in the aerosol to be directly discharged into the carburetor intake passage, resulting in insufficient combustion, deterioration of emissions and increased oil consumption.
An oil and gas separation structure including an oil chamber, upper and lower box, valve chamber and oil transport channel is designed. By setting a partition and a condensing chamber in the valve chamber, the oil and gas separation is achieved using the through holes and oil return ports on the partition, and the lubricating oil is recovered to the oil chamber through the oil return pipeline, combining the one-way valve and the flow chamber design to ensure the stable delivery of lubricating oil.
It effectively realizes oil and gas separation, reduces the amount of oil in the oil mist, reduces the burden on the carburetor, and improves fuel combustion efficiency and fuel economy.
Smart Images
Figure CN223241497U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of engine lubrication systems, and in particular to an oil-gas separation structure of an engine. Background Art
[0002] Four-stroke engines are widely used in various types of machinery and vehicles due to their excellent emissions performance. The lubrication system, an integral part of a four-stroke engine, delivers oil from the oil chamber (oil pan) to all moving parts through a circulating oil circuit for effective lubrication, thereby reducing wear, improving operational fluidity, and extending engine life.
[0003] The working process of the lubrication system is as follows: the oil in the oil chamber is sucked into the crankcase through negative pressure and the oil inlet pipeline; then pressure is formed in the crankcase, and the oil is pressed into the timing gear meshing point through the oil outlet pipeline, lubricating the timing gear while forming oil mist that enters the valve chamber; then the oil is returned and exhausted through the valve chamber.
[0004] In the existing lubrication system, the valve chamber lacks a relatively stable and reliable oil-gas separation mechanism, which causes the aerosol to be directly discharged into the carburetor intake passage when it contains a lot of oil, resulting in incomplete combustion and worsening emissions, which is not conducive to environmental protection and also increases engine oil consumption.
[0005] The above content is only used to assist in understanding the technical solution of this application, and does not mean that the above content is the closest prior art to this application. Summary of the Invention
[0006] Based on this, the present application provides an oil-gas separation structure for an engine to solve the defects of the existing technology.
[0007] The technical solution adopted by the present application to solve its technical problem is: an oil-gas separation structure of an engine, comprising an oil chamber, upper and lower housings, a valve chamber and an oil delivery channel; the upper and lower housings comprise a lower shell and an upper shell, the lower shell is connected to the oil chamber, and the upper shell is connected to the valve chamber; the oil delivery channel comprises an oil inlet pipeline, an oil outlet pipeline and an oil return pipeline, the oil inlet pipeline is used to deliver the oil in the oil chamber to the upper and lower housings, the oil outlet pipeline is used to deliver the oil in the upper and lower housings to the timing gear meshing point and then to the valve chamber, and the oil return pipeline is arranged in the upper and lower housings to connect the valve chamber and the oil chamber;
[0008] The valve chamber includes 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 provided on the partition plate.
[0009] In some embodiments, the oil return port is provided at an end corner of the partition.
[0010] In some embodiments, the valve chamber is provided with a breather pipe connected to the carburetor, and the breather pipe is provided below the partition.
[0011] In some embodiments, a crank connection mechanism is also included, including 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.
[0012] In some embodiments, a first timing gear is provided on the crankshaft, a second timing gear is provided above the first timing gear, and a cam, rocker arm, and push rod are driven by the second timing gear; the oil outlet pipeline is used to transport the oil in the upper and lower boxes to the meshing point of the first timing gear and the second timing gear and then to the valve chamber.
[0013] In some embodiments, the valve chamber is further provided with a plurality of circuit slots, and the circuit slots are used to place and limit the circuits of the ignition system.
[0014] The beneficial effects of this application are as follows: by providing a baffle and condensation chamber in the valve chamber, this application effectively achieves oil-gas separation, reduces the amount of oil in the oil mist, thereby reducing the burden on the carburetor and improving fuel combustion efficiency. By optimizing the oil-gas separation structure, more lubricating oil can be returned to the oil chamber through the oil return line, reducing unnecessary fuel loss and improving fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.
[0016] Figure 1 It is a schematic diagram of the appearance structure of this application.
[0017] Figure 2 This is a schematic diagram of the appearance structure of the hidden upper shell of this application.
[0018] Figure 3 It is a cross-sectional view of the internal structure of this application.
[0019] Figure 4 It is a schematic diagram of the lower shell structure of this application.
[0020] Figure 5 It is a cross-sectional view of the lower shell of this application.
[0021] Figure 6 It is a schematic diagram of the upper shell structure of this application.
[0022] Figure 7This is a structural schematic diagram of the upper shell of the present application from another angle.
[0023] Figure 8 It is a schematic diagram of the valve chamber structure of this application.
[0024] Description of the accompanying figures: 1. Oil chamber, 2. Upper and lower boxes, 21. Lower shell, 211. Flow chamber,
[0025] 22. Upper shell,
[0026] 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,
[0027] 4. Oil inlet pipe, 41. Outlet connector, 42. Connecting hose, 43. Gravity ball head,
[0028] 5. Oil outlet pipeline,
[0029] 6. One-way valve,
[0030] 7. Oil return line, 71. First part, 72. Second part,
[0031] 8. Valve chamber, 81. Partition, 82. Through hole, 83. Oil return port, 84. Breather pipe
[0032] 9. Carburetor. DETAILED DESCRIPTION
[0033] 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 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 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 implement them. When the combination of technical solutions is contradictory 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 this application.
[0034] Please refer to Figure 1-8 As shown, the present application proposes a lubrication system for a four-stroke engine and an oil-gas separation structure thereof. The lubrication system for the four-stroke engine includes:
[0035] Oil chamber: used to store lubricating oil.
[0036] Upper and lower boxes: include a lower shell and an upper shell, the lower shell is connected to the oil chamber, and the upper shell is connected to the valve chamber.
[0037] Crank connection 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.
[0038] 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.
[0039] Oil inlet pipeline: at least a portion of which is arranged through the lower shell, and another portion of which extends into the oil chamber.
[0040] An oil outlet pipeline is formed in the lower housing, and an outlet thereof is close to the first timing gear.
[0041] One-way valve: installed in the oil outlet pipeline to control the opening and closing of the oil outlet pipeline.
[0042] Oil return pipeline: installed in the upper and lower boxes, used to connect the valve chamber and the oil chamber.
[0043] 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.
[0044] Regarding the valve chamber structure: In some embodiments, the valve chamber includes a baffle, which forms a condensation chamber 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 line. The design of the condensation chamber facilitates the condensation and recovery of lubricating oil. Through the through-holes and 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.
[0045] In some embodiments, the oil return port is disposed at a corner of the partition. By disposing the oil return port at a corner of the partition, gravity and negative pressure in the oil chamber can be better utilized to ensure smooth return of lubricating oil to the oil chamber, thereby reducing lubricating oil residue in the valve chamber.
[0046] In some embodiments, the valve chamber is provided with a vent pipe connected to the carburetor, and the vent pipe is located below the partition. Providing a vent pipe connected to the carburetor ensures pressure balance, allowing excess gas in the valve chamber to be discharged into the carburetor for combustion and then discharged into the atmosphere, thereby preventing gas accumulation from affecting the lubrication system circulation.
[0047] In addition, a plurality of circuit slots are provided on the valve chamber, and the circuit slots are used to place and limit the circuits of the ignition system.
[0048] Regarding the placement of the oil chamber: In some embodiments, the oil chamber is positioned below the lower housing, and an inlet for the oil outlet line is positioned at the bottom of the lower housing, with the one-way valve positioned at the inlet. Thus, by positioning the oil chamber below the lower housing and providing the inlet for the oil outlet line at the bottom of the lower housing, combined with the one-way valve, the input of lubricating oil can be effectively controlled, preventing excessive or insufficient oil inflow and ensuring the stability and reliability of the lubrication system.
[0049] In some embodiments, the lower housing includes a flow chamber connecting the inlet and outlet of the oil outlet pipeline. The one-way valve is a valve disc that seals the inlet or opens it when deformed by pressure. The design of the flow chamber ensures smooth flow of lubricating oil into and out of the oil pipeline. The provision of the one-way valve further ensures that the lubricating oil can only flow in one direction, preventing backflow and improving system safety.
[0050] In some embodiments, the lower housing is formed with an outlet for an oil inlet line. The oil inlet line includes an outlet connector, a connecting hose, and a gravity ball joint. The outlet connector is embedded below the outlet of the oil inlet line, and the connecting hose is interference-fitted onto the outlet connector. The gravity ball joint is disposed at the lower end of the connecting hose and has a through hole. This design of the oil inlet line outlet ensures that lubricating oil can flow smoothly into the upper and lower housings. The gravity ball joint also ensures a normal supply of lubricating oil even when the engine is tilted, improving the adaptability of the lubrication system.
[0051] In some embodiments, the lower and upper housings of the upper and lower casings are respectively formed with a first portion and a second portion of an oil return line, with the connection between the first and second portions being sealed and continuous. By dividing the oil return line into two portions and ensuring a sealed and continuous connection, lubricating oil can be effectively directed from the valve operating chamber back to the oil chamber, ensuring the system's closed structure and preventing lubricating oil leakage.
[0052] 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:
[0053] Step 1: The piston moves upward, at this time the one-way valve is in a closed state, negative pressure is formed in the crankcase, and 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 by the negative pressure.
[0054] Step 2: The piston moves downward, and pressure is generated 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 timing gear while forming oil mist that enters the valve chamber.
[0055] Step 3: The oil mist in the valve chamber is condensed, and the oil flows back to the oil chamber through the oil return line. The gas enters the combustion chamber through the carburetor and is burned and then discharged into the atmosphere.
[0056] Step 4: Repeat the above steps.
[0057] Thus far, various embodiments of the present application have been described in detail. To avoid obscuring the concept of the present application, some details well known in the art have not been described. Based on the above description, those skilled in the art will fully understand how to implement the technical solutions disclosed herein.
[0058] 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 solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or 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 various embodiments of the present application.
Claims
1. An oil-gas separation structure of an engine, characterized in that: It includes an oil chamber, upper and lower housings, a valve chamber and an oil delivery channel; the upper and lower housings include a lower shell and an upper shell, the lower shell is connected to the oil chamber, and the upper shell is connected to the valve chamber; the oil delivery channel includes an oil inlet pipeline, an oil outlet pipeline and an oil return pipeline, the oil inlet pipeline is used to transport the oil in the oil chamber to the upper and lower housings, the oil outlet pipeline is used to transport the oil in the upper and lower housings to the timing gear meshing point and then to the valve chamber, and the oil return pipeline is arranged in the upper and lower housings to connect the valve chamber and the oil chamber; The valve chamber includes 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 provided on the partition plate.
2. The oil-gas separation structure of an engine according to claim 1, characterized in that: The oil return port is arranged at one end corner of the partition.
3. The oil-gas separation structure of an engine according to claim 1, characterized in that: The valve chamber is provided with a vent pipe communicating with the carburetor, and the vent pipe is arranged below the partition.
4. The oil-gas separation structure of an engine according to claim 1, characterized in that: It also includes a crank connection mechanism, including 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.
5. The oil-gas separation structure of an engine according to claim 4, characterized in that: A first timing gear is provided on the crankshaft, a second timing gear is provided above the first timing gear, and a cam, rocker arm and push rod driven by the second timing gear are provided; the oil outlet pipeline is used to transport the oil in the upper and lower boxes to the meshing point of the first timing gear and the second timing gear and then to the valve chamber.
6. The oil-gas separation structure of an engine according to claim 1, characterized in that: The valve chamber is also provided with a plurality of circuit slots, which are used to place and limit the circuits of the ignition system.