阅读说明：本技术 四冲程发动机润滑系统 (Four-stroke engine lubrication system ) 是由 周荣辉 于 2021-09-03 设计创作，主要内容包括：本发明涉及一种四冲程发动机润滑系统,包括曲轴箱箱体,所述曲轴箱箱体构成有机油室、凸轮室和曲轴室,所述机油室与曲轴室连通,所述曲轴箱箱体具有用于对曲轴进行旋转支撑的中部,所述中部内具有送油通道,所述送油通道与曲轴室连接处设有送油进口,所述送油通道与凸轮室连接处具有送油出口,所述曲轴上设有缺部,所述送油通道在缺部临近送油出口处时与凸轮室连通,所述曲轴转动以往凸轮室内间歇式泵油。本发明具有结构简单、生产制造方便、生产成本低、润滑效果更好的优点。(The invention relates to a four-stroke engine lubricating system, which comprises a crankcase body, wherein the crankcase body forms an oil chamber, a cam chamber and a crankshaft chamber, the oil chamber is communicated with the crankshaft chamber, the crankcase body is provided with a middle part for rotatably supporting a crankshaft, an oil delivery channel is arranged in the middle part, an oil delivery inlet is arranged at the joint of the oil delivery channel and the crankshaft chamber, an oil delivery outlet is arranged at the joint of the oil delivery channel and the cam chamber, the crankshaft is provided with a notch, the oil delivery channel is communicated with the cam chamber when the notch is close to the oil delivery outlet, and the crankshaft rotates to pump oil in the cam chamber in an intermittent manner. The invention has the advantages of simple structure, convenient production and manufacture, low production cost and better lubricating effect.)

1. The lubricating system of the four-stroke engine is characterized by comprising a crankcase body, wherein the crankcase body forms an oil chamber, a cam chamber and a crankshaft chamber, the oil chamber is communicated with the crankshaft chamber, the crankcase body is provided with a middle part for rotatably supporting a crankshaft, an oil feeding channel is arranged in the middle part, an oil feeding inlet is arranged at the joint of the oil feeding channel and the crankshaft chamber, an oil feeding outlet is arranged at the joint of the oil feeding channel and the cam chamber, the crankshaft is provided with a notch, the oil feeding channel is communicated with the cam chamber when the notch is close to the oil feeding outlet, and the crankshaft rotates to pump oil in the cam chamber in an intermittent mode.

2. The four-stroke engine lubricating system of claim 1, wherein the middle portion further comprises an oil return passage connecting the cam chamber and the crank chamber, wherein an oil return outlet is provided at a connection of the oil return passage and the crank chamber, and an oil return inlet is provided at a connection of the oil return passage and the cam chamber.

3. The four-stroke engine lubricating system of claim 2, wherein the oil feed passage and the oil return passage are offset circumferentially of the crankshaft.

4. The four-stroke engine lubrication system as recited in claim 2, wherein said oil return passage includes a thin section and a thick section, said thin section having an inner diameter smaller than said thick section.

5. The four-stroke engine lubricating system according to claim 2, 3 or 4, wherein a sump is formed at the cam cavity bottom, the sump wall is provided with the oil return inlet, and the sump bottom is lower than the lowest edge of the oil return inlet.

6. The four-stroke engine lubricating system according to claim 1 or 2, wherein the middle portion has a through hole through which the crankshaft passes, the cutout portion is provided on an outer wall of the crankshaft, the oil delivery outlet is provided on a wall of the through hole, and an outer wall of the crankshaft offset from the cutout portion is in clearance fit with the wall of the through hole to close the oil delivery outlet.

7. The four-stroke engine lubricating system as recited in claim 6, wherein the oil delivery outlet of the oil delivery passage is located at a lowermost edge of the hole wall of the passing hole.

8. The four-stroke engine lubricating system according to claim 1, wherein the distance of the missing portion in the axial direction of the crankshaft is greater than the distance of the oil feed outlet in the axial direction of the crankshaft; the oil delivery channel comprises a section arranged along the axial direction of the crankshaft and a second section arranged along the radial direction of the crankshaft, and the first section is connected with the second section.

9. The lubrication system for a four-stroke engine according to claim 1, wherein said top wall of said crank chamber has downwardly extending partition walls on opposite sides thereof, said partition walls being disposed in vertically disposed planes adjacent to each other, said crankshaft being disposed between said partition walls, and a gap for communicating said engine oil chamber with said crank chamber being formed between lower ends of said partition walls.

10. The four-stroke engine lubricating system of claim 1, wherein the lower end of the dividing wall has an arcuate extension that opens toward the crankshaft axis.

Technical Field

The invention relates to a four-stroke engine lubrication system.

Background

In a four-stroke engine, parts in a cam chamber need to be lubricated, but the existing oil path for connecting an engine oil chamber and the cam chamber is quite complex in structure and high in production cost, and the oil pumping effect is poor due to the fact that the oil path is long.

Disclosure of Invention

The invention aims to provide a four-stroke engine lubricating system which is simple in structure, convenient to produce and manufacture, low in production cost and better in lubricating effect.

In order to achieve the purpose, the invention adopts the following technical scheme: the four-stroke engine lubricating system comprises a crankcase body, wherein the crankcase body forms an oil chamber, a cam chamber and a crankshaft chamber, the oil chamber is communicated with the crankshaft chamber, the crankcase body is provided with a middle part used for rotatably supporting a crankshaft, an oil delivery channel is arranged in the middle part, an oil delivery inlet is arranged at the joint of the oil delivery channel and the crankshaft chamber, an oil delivery outlet is arranged at the joint of the oil delivery channel and the cam chamber, a gap part is arranged on the crankshaft, the oil delivery channel is communicated with the cam chamber when the gap part is close to the oil delivery outlet, and the crankshaft rotates to pump oil intermittently in the cam chamber.

When the crankshaft rotates, the crankshaft can stir engine oil in the engine oil chamber to be atomized, when the crankshaft continues to rotate so that the lacking part is close to or even coincides with the oil delivery outlet, the oil delivery inlet of the oil delivery channel and the crankshaft chamber generate atmospheric pressure difference, and the atomized engine oil flows into the oil delivery channel from the crankshaft chamber and enters the cam chamber along the oil delivery channel, so that parts in the cam chamber are lubricated. When the engine piston moves upwards, the pressure in the crankcase body is reduced, and engine oil can return to the crankshaft chamber or the engine oil chamber; wherein, can adopt current oil return mechanism to realize the oil return intercommunication of cam chamber and bent axle room or machine oil chamber. Through the continuous rotation of the crankshaft, intermittent oil pumping and oil returning are realized, and the lubrication of parts in the cam chamber is ensured. Wherein, the gap part is of a gap structure. The oil delivery channel is arranged in the middle part, the middle part is positioned between the cam chamber and the crankshaft chamber, and the oil delivery channel is shorter, so that the pressure difference can be ensured, the oil delivery effect can be ensured, and the lubricating effect can be improved.

Preferably, the middle part is also provided with an oil return channel for connecting the cam chamber and the crankshaft chamber, and an oil return outlet is arranged at the joint of the oil return channel and the crankshaft chamber. Wherein oil in the cam chamber can return from the cam chamber to the crank chamber under the action of gravity. By providing the oil return passage, excessive oil entering the cam chamber is avoided.

Preferably, the oil feed passage and the oil return passage are arranged in a staggered manner along the circumferential direction of the crankshaft. The arrangement avoids the mutual influence of the engine oil entering the oil feeding channel and the engine oil led out from the oil return channel, and simultaneously ensures the structural strength of the crankcase body.

Preferably, the oil return passage comprises a thin section and a thick section, and the inner diameter of the thin section is smaller than that of the thick section. Setting a thin section to avoid excessive engine oil loss; meanwhile, engine oil can be prevented from flowing backwards into the cam chamber along the oil return channel. Meanwhile, the two-section type step design of the oil return passage is convenient for the forming and manufacturing of the crankcase body.

Preferably, a liquid collecting groove is formed in the cavity bottom of the cam cavity, the wall of the liquid collecting groove is provided with the oil return inlet, and the bottom of the liquid collecting groove is lower than the lowest edge of the oil return inlet. The design that the liquid collecting groove is arranged and the lower edge of the oil return inlet is higher than the bottom of the liquid collecting groove enables the cam cavity to be substantially filled with engine oil, so that the lubricating effect of parts in the cam cavity is guaranteed.

Preferably, the middle part is provided with a through hole for the crankshaft to pass through, the notch part is arranged on the outer wall of the crankshaft, the oil delivery outlet is arranged on the wall of the through hole, and the outer wall of the crankshaft, which deviates from the notch part, is in clearance fit with the wall of the through hole to close the oil delivery outlet. Wherein, the gap part is arranged on the outer wall of the crankshaft, and the oil delivery outlet is arranged on the wall of the hole, so that the processing and the manufacturing of the invention are simpler and more convenient. Wherein, also can set up oil blanket structure in middle part department as required to avoid the leakage of machine oil. Wherein, can make different shapes with the scarce portion according to actual need, for example mill out a plane breach or arc breach on the bent axle outer wall and regard as scarce portion.

Preferably, the oil delivery outlet of the oil delivery passage is located at the lowermost edge of the hole wall of the passing hole. The above arrangement makes it easier for the oil in the oil feed passage to be pumped out.

Preferably, the distance of the gap part along the axial direction of the crankshaft is greater than that of the oil delivery outlet along the axial direction of the crankshaft, so that the gap part can cover the oil delivery outlet to ensure the maximization of pressure difference and further ensure the oil pumping effect; the oil delivery channel comprises a section which is arranged along the axial direction of the crankshaft and a second section which is arranged along the radial direction of the crankshaft, wherein the first section is connected with the second section, and the second section is closer to a crank structure on the crankshaft and an engine oil chamber, so that engine oil can conveniently enter the oil delivery channel.

Preferably, the crank chamber has downwardly extending partition walls on opposite sides of a top wall of the crank chamber, faces adjacent to the partition walls are vertically arranged planes, the crank shaft is positioned between the two partition walls, and a gap for communicating the engine oil chamber with the crank chamber is formed between lower ends of the two partition walls. The partition wall is used for separating the engine oil chamber from the crankshaft chamber; the surfaces of the two partition walls, which are close to each other, are planes, the joints of the surfaces and other surfaces of the inner wall of the crankcase body are not smooth, and when the crankshaft rotates to enable the crank on the crankshaft to drive engine oil for one section, the engine oil splashed to the planes of the partition walls can be atomized with higher speed. Wherein, the breach is used for the intercommunication of bent axle room and machine oil chamber.

Preferably, the lower end of the partition wall has an arc-shaped extension section, and an arc-shaped opening formed by the extension section faces the axis of the crankshaft. The design of the extension section not only can reserve a yielding space for the connecting rod on the crankshaft, but also can play a role in gathering engine oil.

The invention has the advantages of simple structure, convenient production and manufacture, low production cost and better lubricating effect.

Drawings

FIG. 1 is a schematic view of a crankcase housing of the present invention;

FIG. 2 is a schematic view of a structure of an oil feed passage of the crankcase body of the present invention;

FIG. 3 is a schematic view of one configuration of the oil return passage of the crankcase housing of the present invention;

FIG. 4 is a schematic illustration of a crankshaft of the present invention;

FIG. 5 is a schematic view showing a structure in which the oil feed passage of the present invention is blocked;

fig. 6 is a schematic view showing a structure in which the oil feed passage of the present invention communicates with the cam chamber.

Detailed Description

The invention is further described below with reference to the figures and specific embodiments.

As shown in fig. 1, the four-stroke engine lubricating system of the present invention includes a crankcase body 100, the crankcase body 100 forms an engine oil chamber 11, a cam chamber 12 and a crank chamber 13, the engine oil chamber 11 is communicated with the crank chamber 13, the crankcase body 100 has a middle portion 1 for rotatably supporting a crankshaft 2, and the middle portion 1 has an oil feed passage 3 and an oil return passage 4 therein.

As shown in fig. 1 to 6, an oil feed inlet 31 is provided at a connection between the oil feed passage 3 and the crank chamber 13, an oil feed outlet 32 is provided at a connection between the oil feed passage 3 and the cam chamber 12, and a cutout 21 is provided in the crankshaft 2. The oil feed passage 3 communicates with the cam chamber 12 when the cutout portion 21 is adjacent to the oil feed outlet 32, and the crankshaft 2 rotates to intermittently pump the oil in the cam chamber 12. The oil feed channel 3 includes a first section 301 disposed along the axial direction of the crankshaft 2 and a second section 302 disposed along the radial direction of the crankshaft 2, and the first section 301 is connected to the second section 302.

The crankcase body 100 has a through hole 10 in the middle for the crankshaft 2 to pass through, the oil delivery outlet 21 is arranged on the hole wall of the through hole 10, and the outer wall of the crankshaft 2 deviated from the notch 21 is in clearance fit with the hole wall of the through hole 10 to close the oil delivery outlet 32. The oil delivery outlet 32 of the oil delivery passage 3 is located at the lowermost edge of the hole wall passing through the hole 10. The groove bottom of the notch part 21 is of a planar groove structure, and the distance of the notch part 21 along the axial direction of the crankshaft 2 is greater than that of the oil delivery outlet 32 along the axial direction of the crankshaft 2. Wherein the middle portion 1 of the crankcase housing 100 is formed with a fixing groove structure 17 communicating with the passage hole 10, and an oil seal is provided in the fixing groove structure 17 to prevent oil in the cam chamber 12 from leaking. The crankshaft 2 is rotatably supported and fixed to the middle part by a bearing 18.

As shown in fig. 1, 2 and 3, an oil return outlet 41 is arranged at the joint of the oil return channel 4 and the crank chamber 13, a liquid collecting groove 19 is formed at the cavity bottom of the cam cavity 11, an oil return inlet is arranged at the joint of the oil return channel 4 and the liquid collecting groove 19 of the cam chamber 12, the oil return inlet is arranged on the groove wall of the liquid collecting groove 19, and the groove bottom of the liquid collecting groove 19 is lower than the lowest edge of the oil return inlet. Oil in the cam chamber 12 can return from the cam chamber 12 to the crank chamber 13 by gravity. Wherein, the oil delivery channel 3 and the oil return channel 4 are arranged along the circumferential direction of the crankshaft 1 in a staggered way.

As shown in fig. 3, the oil return passage 4 includes a thin section 401 and a thick section 402, and the inner diameter of the thin section 401 is smaller than that of the thick section 402. In this embodiment, the thin section 401 is adjacent to the sump 19 than the thick section 402, and the end of the thin section 401 away from the thick section 402 is the oil return inlet.

As shown in fig. 1, 2, 3, 5 and 6, the crank chamber 13 has partition walls 14 extending downward on opposite sides of the top wall thereof, the surfaces adjacent to the partition walls 14 are vertically arranged flat surfaces, the crank shaft 2 is located between the partition walls 14, and a gap for communicating the oil chamber 11 with the crank chamber 13 is formed between the lower ends of the partition walls 14. The lower end of the partition wall 14 has an arc-shaped extension section 15, and an arc-shaped opening formed by the extension section 15 faces the rotation axis of the crankshaft 2.

When the crankshaft rotates, the crankshaft can stir engine oil in the engine oil chamber to be atomized, when the crankshaft continues to rotate so that the lacking part is close to or even coincides with the oil delivery outlet, the oil delivery inlet of the oil delivery channel and the crankshaft chamber generate atmospheric pressure difference, and the atomized engine oil flows into the oil delivery channel from the crankshaft chamber and enters the cam chamber along the oil delivery channel, so that parts in the cam chamber are lubricated. The invention is used in conjunction with an engine, when the engine piston moves upward, the pressure in the crankcase body will be reduced, and engine oil can flow into the crankshaft chamber through the oil return passage. In the present embodiment, the oil is intermittently pumped into the cam chamber by the continuous rotation of the crankshaft, and the excess oil in the cam chamber can also flow back to the crank chamber.

The invention has the advantages of simple structure, convenient production and manufacture, low production cost and better lubricating effect.