Oil supply structure of four-stroke engine
By optimizing the oil outlet pipeline and setting up a check valve, the problem of large oil loss in the four-stroke engine lubrication system is solved, and the lubrication efficiency and system reliability are improved.
Patent Information
- Application Number
- CN202422660651.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-11-01
AI Technical Summary
In the lubrication system of existing four-stroke engines, the amount of oil is lost when transmitted to the meshing of the timing gear, resulting in low lubrication efficiency.
Optimize the oil outlet pipeline to make its outlet approach the meshing of the timing gear, and set a one-way valve in the oil outlet pipeline, including a kit, valve body and connecting copper pipe, to ensure that the oil flows only in one direction. The shuttle valve body is automatically opened under pressure and closed under normal conditions.
It effectively reduces oil loss during transmission, improves lubrication efficiency, and simplifies the system structure for easy installation and maintenance.
Smart Images
Figure CN223152120U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of engines, and particularly to an oil supply structure of a four-stroke engine. Background Art
[0002] Due to its good emission performance, 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] Currently, the existing four-stroke engines still have the following problems: In the first process of the lubrication system, the oil in the oil chamber needs to be injected into the crankshaft chamber, and then the oil in the crankshaft chamber is transported to the timing gear meshing position until the valve chamber through pressure. Due to the unreasonable layout of the internal pipelines of the housing, the engine oil input to the timing gear meshing position generally goes from bottom to top and is relatively far from the timing gear meshing position. During the process of the lower timing gear driving the oil to the upper timing gear, the oil loss is relatively large.
[0004] To solve the above problems, the applicant of the present application optimizes the oil outlet pipeline so that the outlet of the oil outlet pipeline can be closer to the timing gear meshing position, which can effectively reduce the oil loss during transmission and further improve the lubrication efficiency. Based on this, it is necessary to further improve the valve in the traditional pipeline, so this application is proposed.
[0005] The above content is only used to assist in understanding the technical solution of the present application, and does not represent an admission that the above content is the closest prior art to the present application. Summary of the Invention
[0006] Based on this, the present application provides an oil supply structure of a four-stroke engine to at least solve one of the defects of the prior art.
[0007] The technical solution adopted by the present application to solve its technical problems is: an oil supply structure of a four-stroke engine, the four-stroke engine includes an oil chamber, a crankshaft chamber, and an oil transmission channel. The crankshaft chamber includes an upper housing and a lower housing. The oil transmission channel includes an oil inlet pipeline and an oil outlet pipeline. The oil inlet pipeline is used to transport the oil in the oil chamber to the crankshaft chamber, and the oil outlet pipeline is used to transport the oil in the crankshaft chamber to the timing gear meshing position until the valve chamber. Among them, a one-way valve is provided at the oil outlet pipeline to control the opening and closing of the oil outlet pipeline. The one-way valve includes a kit, a valve body, and a connecting copper pipe. The kit is embedded in the lower housing, the valve body is press-fitted in the kit, and the connecting copper pipe is connected to the valve body and extends to the bottom position of the lower housing.
[0008] In some embodiments, the oil outlet pipeline includes a first section and a second section. The first section communicates with the bottom of the lower housing, and the second section is formed on the connecting end face of the lower housing, and the outlet of the second section approaches the meshing position of the timing gears.
[0009] In some embodiments, after the upper housing and the lower housing are combined, the oil outlet pipeline is sealed.
[0010] In some embodiments, the one-way valve is disposed between the first section and the second section of the oil outlet pipeline, allowing oil to enter from the first section to the second section.
[0011] In some embodiments, the head of the valve body is spindle-shaped and elastically deformable, and has an opening; when oil enters from the first section to the second section, the opening is opened under pressure; in the normal state, the opening automatically deforms to remain closed.
[0012] In some embodiments, the opening is in a shape of a straight line and extends a certain distance along the axial direction of the valve body head.
[0013] In some embodiments, a timing gear placement position is provided on the lower housing, and the outlet of the second section of the oil outlet pipeline communicates with the timing gear placement position.
[0014] In some embodiments, an oil storage chamber communicating with the first section of the oil outlet pipeline is formed at the bottom of the lower housing, and the oil storage chamber is lower than the bottom wall of the lower housing.
[0015] The beneficial effects of the present application are as follows: By optimizing the oil outlet pipeline, the outlet of the oil outlet pipeline can be closer to the meshing position of the timing gears, which can effectively reduce the oil loss during the transmission process and further improve the lubrication efficiency. At the same time, by disposing the one-way valve between the first section and the second section of the oil outlet pipeline, the system structure is simplified, which is convenient for installation and maintenance; the spindle-shaped valve body can automatically open under pressure and automatically close in the absence of pressure, ensuring the working efficiency of the one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] 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 drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0017] Figure 1 is a schematic diagram of the external structure of the present application.
[0018] Figure 2 is a schematic diagram of the external structure of the present application with the upper housing hidden.
[0019] Figure 3 is a cross-sectional view of the internal structure of the present application.
[0020] Figure 4 is a schematic diagram of the structure of the lower housing of the present application.
[0021] Figure 5 is a cross-sectional view of the lower housing of the present application.
[0022] Figure 6 is one of the schematic diagrams of the structure of the check valve of the present application.
[0023] Figure 7 is another schematic diagram of the structure of the check valve of the present application.
[0024] Explanation of the reference numerals in the drawings: 1. oil chamber, 2. crankshaft chamber, 21. lower housing, 211. connecting end face, 212. timing gear placement position, 213. oil storage chamber,
[0025] 22. upper housing,
[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 pipeline, 41. outlet connector, 42. connecting copper pipe, 43. gravity ball head,
[0028] 5. oil outlet pipeline, 51. first section, 52. second section,
[0029] 6. check valve, 61. kit, 62. valve body, 621. opening, 63. connecting pipe. Detailed implementation manners
[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings 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 those of ordinary skill in the art without making 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 the technical solutions appears to be contradictory or unable to 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.
[0031] Please refer to Figure 1-7 as shown, the present application proposes an oil delivery channel of a four-stroke engine and a valve structure for the oil delivery channel.
[0032] The four-stroke engine includes:
[0033] Oil chamber: used to store lubricating oil.
[0034] Crankshaft chamber: includes 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.
[0035] 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.
[0036] 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.
[0037] 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.
[0038] Oil outlet pipeline: formed on the lower shell.
[0039] One-way valve: installed in the oil outlet pipeline to control the opening and closing of the oil outlet pipeline.
[0040] Oil return pipeline: installed in the crankshaft chamber, used to connect the valve chamber and the oil chamber.
[0041] Wherein, the oil outlet pipeline includes a first section and a second section, the first section is communicated with the bottom of the lower shell, the second section is formed on the connecting end surface of the lower shell, and the outlet of the second section is close to the meshing point of the first timing gear and the second timing gear.
[0042] The valve is a one-way valve, which includes a kit, a valve body and a connecting copper tube. The kit is embedded in the lower shell, the valve body is inserted in the kit with interference fit, and the connecting copper tube is connected to the valve body and extends to the bottom of the lower shell. The combined design of the kit, the valve body and the connecting copper tube ensures that the one-way valve can work reliably and is easy to install and maintain.
[0043] In some embodiments, the head of the valve body is shuttle-shaped and elastically deformable, and has an opening; when the oil enters from the first section to the second section, the opening is opened by pressure; in normal state, the opening automatically deforms and remains closed. The shuttle-shaped valve body automatically opens under pressure and automatically closes in a pressure-free state, ensuring the one-way flow of lubricating oil while preventing backflow.
[0044] In some embodiments, the opening is in a straight line shape and extends a certain distance along the axial direction of the valve body head. The design of the straight-line opening ensures that the opening can evenly expand under pressure, improving the working efficiency of the check valve.
[0045] Details regarding some other embodiments:
[0046] Preferably, an oil passage is provided on 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.
[0047] In some embodiments, after the upper housing and the lower housing are combined, the oil outlet pipeline is sealed. Ensuring that the oil outlet pipeline remains sealed after the upper housing and the lower housing are combined prevents lubricating oil leakage and improves the reliability of the system.
[0048] In some embodiments, the check valve is disposed between the first section and the second section of the oil outlet pipeline, allowing oil to flow from the first section into the second section. The setting of the check valve ensures that the lubricating oil can only flow in one direction, preventing the reverse flow of the lubricating oil and improving the safety and stability of the lubrication system.
[0049] In some embodiments, a timing gear placement position is provided on the lower housing, and the outlet of the second section of the oil outlet pipeline communicates with the timing gear placement position. The design of the timing gear placement position ensures that the lubricating oil can directly flow to the meshing position of the timing gears, improving the lubrication effect of the timing gears.
[0050] In some embodiments, an oil storage chamber communicating with the first section of the oil outlet pipeline is formed at the bottom of the lower housing, and the oil storage chamber is lower than the bottom wall of the lower housing. The design of the oil storage chamber ensures that there is sufficient storage space for the lubricating oil at the bottom of the lower housing and facilitates the collection and recirculation of the lubricating oil.
[0051] 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 crankshaft chamber, and the connection 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 is sealed and through, the lubricating oil can be effectively guided from the valve chamber back to the oil chamber, ensuring the closure of the system and preventing lubricating oil leakage.
[0052] So 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. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.
[0053] 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 limiting 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 fuel supply structure of a four-stroke engine, characterized in that, The four-stroke engine includes an oil chamber, a crankshaft chamber and an oil delivery passage. The crankshaft chamber includes an upper housing and a lower housing. The oil delivery passage includes an oil inlet pipeline and an oil outlet pipeline. The oil inlet pipeline is used to deliver the oil in the oil chamber to the crankshaft chamber, and the oil outlet pipeline is used to deliver the oil in the crankshaft chamber to the timing gear meshing position and then to the valve chamber. Wherein, a check valve is provided at the oil outlet pipeline for controlling the opening and closing of the oil outlet pipeline. The check valve includes a kit, a valve body and a connecting copper pipe. The kit is embedded in the lower housing, the valve body is press-fitted in the kit, and the connecting copper pipe connects the valve body and extends to the bottom position of the lower housing.
2. The fuel supply structure of the four-stroke engine according to claim 1, characterized in that, The oil outlet pipeline includes a first section and a second section. The first section communicates with the bottom of the lower housing, and the second section is formed on the connecting end face of the lower housing, and the outlet of the second section approaches the timing gear meshing position.
3. The fuel supply structure of the four-stroke engine according to claim 2, characterized in that, After the upper housing and the lower housing are combined, the oil outlet pipeline is sealed.
4. The fuel supply structure of the four-stroke engine according to claim 2, characterized in that The check valve is arranged between the first section and the second section of the oil outlet pipeline and allows the oil to enter from the first section to the second section.
5. The fuel supply structure of the four-stroke engine according to claim 4, wherein, The head of the valve body is spindle-shaped and elastically deformable, and has an opening; when the oil enters from the first section to the second section, the opening is opened under pressure; in the normal state, the opening automatically deforms to keep closed.
6. The fuel supply structure of the four-stroke engine according to claim 5, characterized in that, The opening is in the shape of a straight line and extends a certain distance along the axial direction of the valve body head.
7. The fuel supply structure of the four-stroke engine according to claim 2, characterized in that, A timing gear placement position is provided on the lower housing, and the outlet of the second section of the oil outlet pipeline communicates with the timing gear placement position.
8. The fuel supply structure of the four-stroke engine according to claim 2, characterized in that, An oil storage chamber communicating with the first section of the oil outlet pipeline is formed at the bottom of the lower housing, and the oil storage chamber is lower than the bottom wall of the lower housing.