Four-stroke engine

Abstract

The invention discloses a four-stroke engine. The four-stroke engine comprises an oil chamber; the upper and lower box bodies comprise a lower shell and an upper shell, the lower shell is connected with the oil chamber, and the upper shell is connected with the valve chamber; a first timing gear is arranged on the crankshaft, a second timing gear, a cam, a rocker arm and a push rod are arranged above the first timing gear, and the cam, the rocker arm and the push rod are driven by the second timing gear; at least one part of the oil inlet pipeline is arranged in the lower shell in a penetrating manner, and the other part of the oil inlet pipeline extends into the oil chamber; the oil outlet pipeline is formed on the lower shell; the one-way valve is arranged at the oil outlet pipeline and used for controlling opening and closing of the oil outlet pipeline; 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; the oil outlet pipeline comprises 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 face of the lower shell, and an outlet of the second section is close to the meshing position of the first timing gear and the second timing gear.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to 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] The existing four-stroke engines still have the following problems: First, 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] Secondly, since the internal pipeline layout of the housing is not reasonable enough, the engine oil input to the gear meshing point is generally from bottom to top, far away from the gear meshing point. The oil loss is relatively large in the process of the lower timing gear driving the oil to the upper timing gear.

[0005] 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

[0006] Based on this, the present application provides a lubrication system and a lubrication method for 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 the technical problem is: 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 on the lower housing; 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; Wherein, the oil outlet pipeline includes a first section and a second section, the first section is communicated with the bottom of the lower housing, the second section is formed on the connecting end surface of the lower housing, and the outlet of the second section approaches the meshing position of the first timing gear and the second timing gear; An oil circuit is provided 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 be intermittently connected with the oil inlet pipeline to achieve precise oil supply.

[0008] In some embodiments, after the upper shell is combined with the lower shell, the oil outlet pipeline is sealed.

[0009] 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 flow from the first section to the second section.

[0010] In some embodiments, the one-way valve includes a kit, a valve body and a connecting copper tube, the kit is embedded in the lower shell, the valve body is interference-inserted in the kit, and the connecting copper tube is connected to the valve body and extends to the bottom position of the lower shell.

[0011] In some embodiments, the head of the valve body is shuttle-shaped and elastically deformable, and has an opening; when 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.

[0012] In some embodiments, the opening is in a straight line shape and extends an end distance along the axial direction of the valve body head.

[0013] In some embodiments, a gear placement position is provided on the lower housing, and the outlet of the second section of the oil outlet pipeline is connected to the 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 shell, and the oil storage chamber is lower than the bottom wall of the lower shell.

[0015] 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.

[0016] The beneficial effects of the present application are as follows: First, by setting a specific oil circuit design on the crankshaft, precise oil intake is achieved, avoiding the problems caused by the difficulty in controlling the oil intake amount in the traditional system, and utilizing the intermittent connection between the radial oil inlet hole and the oil inlet pipeline when the crankshaft rotates, thereby ensuring that the engine oil enters the crankcase at the appropriate time and improving the lubrication efficiency; second, by optimizing the oil outlet pipeline, the outlet of the oil outlet pipeline can be closer to the meshing point of the timing gear, which can effectively reduce the oil loss in the transmission process and further improve the lubrication efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a schematic diagram of the appearance structure of this application.

[0019] Figure 2 It is a schematic diagram of the appearance structure of the hidden upper shell of the present application.

[0020] Figure 3 It is a cross-sectional view of the internal structure of this application.

[0021] Figure 4 It is a schematic diagram of the lower shell structure of the present application.

[0022] Figure 5 It is a cross-sectional view of the lower shell of the present application.

[0023] Figure 6 It is one of the schematic diagrams of the one-way valve structure of the present application.

[0024] Figure 7 This is the second schematic diagram of the one-way valve structure of the present application.

[0025] Description of the accompanying figures: 1. Oil chamber, 2. Upper and lower boxes, 21. Lower housing, 211. Connecting end surface, 212. Gear placement position, 213. Oil storage 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 copper pipe, 43. Gravity ball head, 5. Oil outlet pipeline, 51. First section, 52. Second section, 6. Check valve, 61. Kit, 62. Valve body, 621. Opening, 63. Connecting pipe. 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 1-7 As shown, the present application proposes 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] Oil outlet pipeline: formed on the lower shell.

[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, the oil outlet pipeline includes a first section and a second section, the first section is communicated with the bottom of the lower shell body, the second section is formed on the connecting end surface of the lower shell body, and the outlet of the second section is close to the meshing point of the first timing gear and the second timing gear; 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. When the crankshaft rotates, the radial oil inlet hole can intermittently penetrate the oil inlet pipeline to achieve precise oil supply.

[0036] Details about some other embodiments: In some embodiments, after the upper shell and the lower shell are combined, the oil outlet pipeline is sealed, ensuring that the oil outlet pipeline remains sealed after the upper shell and the lower shell are combined, preventing lubricating oil leakage and improving system reliability.

[0037] 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 flow from the first section to the second section. The one-way valve ensures that the lubricating oil can only flow in one direction, prevents the lubricating oil from flowing back, and improves the safety and stability of the lubrication system.

[0038] In some embodiments, the one-way valve includes a kit, a valve body and a connecting copper tube, wherein the kit is embedded in the lower shell, the valve body is inserted in the kit with an 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.

[0039] 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.

[0040] In some embodiments, the opening is in a straight line shape and extends a distance along the axial direction of the valve body head. The straight line opening design ensures that the opening can be opened evenly under pressure, thereby improving the working efficiency of the one-way valve.

[0041] In some embodiments, a gear placement position is provided on the lower housing, and the outlet of the second section of the oil outlet pipeline is connected to the gear placement position. The design of the gear placement position ensures that the lubricating oil can flow directly to the gear meshing position, thereby improving the lubrication effect of the gear.

[0042] In some embodiments, the bottom of the lower housing is formed with an oil storage chamber that is in communication with the first section of the oil outlet pipeline, 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 recycling of the lubricating oil.

[0043] 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.

[0044] 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.

[0045] 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 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 on the lower housing; 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; Wherein, the oil outlet pipeline includes a first section and a second section, the first section is communicated with the bottom of the lower housing, the second section is formed on the connecting end surface of the lower housing, and the outlet of the second section approaches the meshing position of the first timing gear and the second timing gear; An oil circuit is provided 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 be intermittently connected with the oil inlet pipeline to achieve precise oil supply.

2. A four-stroke engine according to claim 1, characterized in that: After the upper shell is combined with the lower shell, the oil outlet pipeline is sealed.

3. A four-stroke engine according to claim 1, characterized in that: The one-way valve is arranged between the first section and the second section of the oil outlet pipeline, allowing oil to flow from the first section to the second section.

4. A four-stroke engine according to claim 1 or 3, characterized in that: The one-way valve comprises a kit, a valve body and a connecting copper tube. The kit is embedded in the lower shell, the valve body is interference-inserted in the kit, and the connecting copper tube is connected to the valve body and extends to the bottom position of the lower shell.

5. A four-stroke engine according to claim 4, characterized in that: The head of the valve body is shuttle-shaped and elastically deformable, and has an opening; when 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.

6. A four-stroke engine according to claim 5, characterized in that: The opening is in a straight line shape and extends an end distance along the axial direction of the valve body head.

7. A four-stroke engine according to claim 1, characterized in that: A gear placement position is provided on the lower shell body, and the outlet of the second section of the oil outlet pipeline is connected to the gear placement position.

8. A four-stroke engine according to claim 1, 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 shell, and the oil storage chamber is lower than the bottom wall of the lower shell.

9. 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.

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