WO2023005538A1

WO2023005538A1 - Engine lubrication system and engine

Info

Publication number: WO2023005538A1
Application number: PCT/CN2022/101258
Authority: WO
Inventors: 倪伟; 张欣林; 庞淑娟; 姜维
Original assignee: 奇瑞汽车股份有限公司
Priority date: 2021-07-28
Filing date: 2022-06-24
Publication date: 2023-02-02
Also published as: CN113417712A

Abstract

The present disclosure provides an engine lubrication system and an engine, belonging to the field of automobiles. The engine lubrication system comprises an oil pump, a main oil passage, and a return oil passage; the oil pump is a fully variable displacement oil pump, and an oil inlet of the oil pump is used to connect to an oil pan of the engine; an oil inlet of the main oil passage is connected to an oil outlet of the oil pump, and an oil outlet of the main oil passage is used to connect to a lubricating chamber of the engine; a first end of the return oil passage is connected to the main oil passage, and a second end of the return oil passage is connected to a sensing end of the oil pump; and the oil pump is configured to adjust the oil pressure of the oil outlet of the oil pump according to the oil pressure returned by the return oil channel. In the engine lubrication system of the present disclosure, the oil pressure of the engine lubrication system can be adjusted in real time.

Description

Engine lubrication system and engine

This disclosure claims the priority of the Chinese patent application with application number 202110858145.5 and titled "Engine Lubrication System and Engine" filed on July 28, 2021, the entire contents of which are incorporated in this application by reference.

technical field

The disclosure belongs to the field of automobiles, and in particular relates to an engine lubrication system and the engine.

Background technique

The main function of the lubrication system of the engine is to deliver a certain amount of clean lubricating oil to the surface of the relative moving parts to reduce the wear of the parts, and to clean and cool the surface of the parts.

In the related art, the lubricating system of the engine includes an oil pump and a main oil passage, etc. The oil pump delivers the lubricating oil to the main oil passage provided on the cylinder block of the engine, and through the main oil passage to various parts of the engine that need to be lubricated. Since the engine speed is positively correlated with the output pressure of the oil pump, when the engine speed is high, the output pressure of the oil pump may exceed the normal lubricating oil demand pressure range. In order to avoid the above problems, a mechanical pressure relief valve will be installed in the outlet pipeline of the oil pump. When the output pressure of the oil pump is higher than the required pressure range of the lubricating oil, the pressure relief valve will open, and the lubricating oil output by the oil pump can pass through the pressure relief valve. The pressure valve flows into the low-pressure oil pan to reduce the output pressure.

However, when the pressure relief valve is in use, if there is a sticking problem, the lubricating oil will continue to flow into the oil pan, resulting in a continuous drop in the pressure of the lubricating oil, and eventually the engine will have malignant failures such as burning tiles and cylinder scuffing due to lack of lubrication.

Contents of the invention

Embodiments of the present disclosure provide a lubricating system of an engine and the engine, which can realize real-time adjustment of the oil pressure of the lubricating system of the engine. Described technical scheme is as follows:

An embodiment of the present disclosure provides a lubricating system for an engine, and the lubricating system for the engine includes an oil pump, a main oil passage and a feedback oil passage;

The displacement of the oil pump is variable throughout, and the oil inlet of the oil pump is used to connect with the oil pan of the engine;

The oil inlet of the main oil passage is connected with the oil outlet of the oil pump, and the oil outlet of the main oil passage is used to connect with the lubricating chamber of the engine;

The first end of the feedback oil passage is connected to the main oil passage, and the second end of the feedback oil passage is connected to the sensing end of the oil pump;

The oil pump is configured to adjust the oil pressure of the oil outlet of the oil pump according to the oil pressure fed back from the feedback oil passage.

In yet another implementation of the present disclosure, the main oil gallery includes a first main oil section, a second main oil section and a third main oil section;

The first end of the first main oil section is connected to the oil outlet of the oil pump;

The first end of the second main oil section is connected to the second end of the first main oil section, and the second end of the second main oil section is used to connect with the crankshaft lubricating chamber of the engine;

The first end of the third main oil section is connected to the second main oil section, the second end of the third main oil section is used to connect with the camshaft lubricating chamber of the engine, and the feedback oil passage It is connected with the second end of the third main oil section.

In yet another implementation manner of the present disclosure, the main oil passage further includes a crankshaft oil section; the crankshaft oil section is connected to the second end of the third main oil section, and the crankshaft oil section is used to communicate with the The crankshaft lubricating chamber of the engine is connected.

In yet another implementation manner of the present disclosure, the extending direction of the connecting oil section is perpendicular to the extending direction of the camshaft oil section.

In yet another implementation of the present disclosure, the main oil passage further includes a connecting oil section and a camshaft oil section; the first end of the connecting oil section is connected to the second end of the second main oil section, The second end of the connecting oil section is connected with the camshaft oil section;

The extending direction of the camshaft oil section is the same as that of the crankshaft oil section, and the camshaft oil section is used to be connected with the camshaft lubricating chamber of the engine.

In yet another implementation of the present disclosure, it also includes a machine filter module; the oil inlet of the machine filter module is connected to the first end of the first main oil section, and the oil outlet of the machine filter module is connected to the The first end of the second main oil section is connected.

In yet another implementation of the present disclosure, an oil return passage is also included; the first end of the oil return passage is used to connect with the lubricating chamber of the engine, and the second end of the oil return passage is used to connect with the connected to the oil pan of the engine.

In yet another implementation of the present disclosure, the oil return passage includes at least one first oil return section, at least one second oil return section, and multiple third oil return sections;

The angle between the extension direction of the first oil return section and the horizontal plane is less than 90 degrees, and the first oil return section is used to connect with the camshaft lubricating chamber of the engine;

The second oil return section is arranged corresponding to the first oil return section, the first end of the second oil return section is connected to the corresponding first oil return section, and the second oil return section is connected to the first oil return section. An included angle is formed between the corresponding first oil return sections, and the second end of the second oil return section is used to connect with the oil pan of the engine;

A plurality of the third oil return section and the second oil return section are arranged in parallel with each other at intervals, and the first end of the third oil return section is used to connect with the camshaft lubricating chamber of the engine, and the first oil return section The second end of the three oil return sections is used to connect with the oil pan of the engine.

In yet another implementation manner of the present disclosure, the middle part of the second oil return section has a first diameter reducing section; the inner diameter of the middle part of the first diameter reducing section is larger than the inner diameters of both ends.

In yet another implementation manner of the present disclosure, the inner diameter of the first end of the second oil return section is smaller than the inner diameter of the second end of the second oil return section, and the inner diameter of the second end of the second oil return section smaller than the inner diameter of the first variable diameter section.

In yet another implementation manner of the present disclosure, the middle part of the third oil return section has a second diameter-reducing section; the inner diameter of the middle part of the second diameter-reducing section is larger than the inner diameters of both ends.

In yet another implementation manner of the present disclosure, the inner diameter of the first end of the third oil return section is smaller than the inner diameter of the second end of the third oil return section, and the inner diameter of the second end of the third oil return section smaller than the inner diameter of the second variable diameter section.

In yet another implementation of the present disclosure, the embodiment of the present disclosure also provides an engine, the engine includes a cylinder block, a cylinder head, an oil pan, and the lubrication system of the above-mentioned engine; the inside of the cylinder block has Crankshaft lubricating chamber; the cylinder head sealing cover is arranged on the top of the cylinder block, the cylinder head has a camshaft lubricating chamber inside, and the oil pan is connected with the bottom of the cylinder block;

The lubricating system is connected with the side walls of the cylinder block and the cylinder head, and the lubricating system is connected with the lubricating chamber of the camshaft and the lubricating chamber of the crankshaft.

The beneficial effects brought by the technical solutions provided by the embodiments of the present disclosure are:

When the lubricating system of the engine works, lubricating oil flows from the oil inlet of the main oil passage to the oil outlet, and delivers lubricating oil to the lubricating chamber (crankshaft lubricating chamber and camshaft lubricating chamber, etc.) in the engine. Since the feedback oil passage is connected to the main oil passage, the oil pressure in the feedback oil passage is the same as the oil pressure in the main oil passage. The sensing end of the oil pump can sense the oil pressure in the main oil passage through the feedback oil passage, so that Adjust the oil pressure of the oil outlet of the oil pump, so that the lubricating oil can meet the actual oil pressure, and realize the real-time adjustment of the oil pressure of the engine lubrication system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a lubrication system of an engine provided by an embodiment of the present disclosure;

Fig. 2 is a schematic structural view of a cylinder block of an engine provided by an embodiment of the present disclosure;

Fig. 3 is a schematic structural view of a cylinder head of an engine provided by an embodiment of the present disclosure.

The meanings of the symbols in the figure are as follows:

1. Oil pump;

2. Main oil passage; 21. First main oil section; 22. Second main oil section; 23. Third main oil section; 24. Crankshaft oil section; 242. Crankshaft oil outlet pipe; 25. Connecting oil section; 26. Camshaft oil section; 261. Intake side camshaft oil section; 262. Exhaust side camshaft oil section; 2611. Intake side camshaft oil outlet pipe; 2612. Intake side camshaft oil outlet plate; 27. Booster 28. Timing chain oil section;

3. Feedback oil channel;

4. Oil return channel; 41. The first oil return section; 42. The second oil return section; 421. The first variable diameter section; 43. The third oil return section; 431. The second variable diameter section;

5. Machine filter module;

100, the cylinder body; 200, the cylinder head; 2001, the first cover body; 2002, the second cover body.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the following will further describe the implementation of the present disclosure in detail in conjunction with the accompanying drawings.

The car includes the oil pan and the engine, and the oil pan is located at the bottom of the engine. The lubrication system of the engine includes the oil pump, the main oil passage and the oil filter. When the lubricating system of the engine is lubricating the engine, the oil pump sucks lubricating oil from the oil pan, and after the lubricating oil is filtered through the oil filter, it is then delivered to the main oil passage set on the cylinder block of the engine, and It is delivered to various parts that need lubrication through the main oil passage.

An embodiment of the present disclosure provides a lubricating system for an engine. As shown in FIG. 1 , the lubricating system for an engine includes an oil pump 1 , a main oil passage 2 and a feedback oil passage 3 . The oil pump 1 is a full range variable displacement oil pump, and the oil inlet of the oil pump 1 is used to be connected with the oil pan of the engine. The oil inlet of the main oil passage 2 is connected with the oil outlet of the oil pump 1, and the oil outlet of the main oil passage 2 is used to be connected with the lubricating chamber of the engine. The first end of the feedback oil passage 3 is connected with the main oil passage 2 , and the second end of the feedback oil passage 3 is connected with the sensing end of the oil pump 1 . The oil pump 1 is configured to adjust the oil pressure at the oil outlet of the oil pump 1 according to the oil pressure fed back from the feedback oil passage 3 .

When the lubricating system of the engine works, the lubricating oil flows from the oil inlet of the main oil passage 2 to the oil outlet, and delivers the lubricating oil to the lubricating cavity in the engine (the lubricating cavity includes a crankshaft lubricating cavity and a camshaft lubricating cavity, etc.). Since the feedback oil passage 3 is connected to the main oil passage 2, the oil pressure in the feedback oil passage 3 is the same as the oil pressure in the main oil passage 2, and the sensing end of the oil pump 1 can sense the main oil passage 2 through the feedback oil passage 3. According to the oil pressure fed back by the feedback oil passage 3, the oil pressure of the oil outlet of the oil pump 1 is adjusted, so that the lubricating oil can meet the actual oil pressure required, and the real-time adjustment of the oil pressure of the lubricating system of the engine is realized.

The sensing end of the oil pump is generally a pressure sensor, through which the oil pressure in the feedback oil passage 3 and the main oil passage 2 can be sensed.

In the embodiment of the present disclosure, the oil pump 1 can be installed on the outer wall of the cylinder of the engine to ensure the stability of the oil pump 1 and make the oil pump 1 closer to the cylinder of the engine. Since the oil inlet of the main oil passage 2 is connected with the oil outlet of the oil pump 1, there is no need to use other passages for connection, which can reduce the length of the main oil passage 2, thereby reducing the volume of the lubrication system of the entire engine, thereby reducing the Small engine volume.

Optionally, the main oil gallery 2 includes a first main oil section 21 , a second main oil section 22 and a third main oil section 23 . The first end of the first main oil section 21 is connected with the oil outlet of the oil pump 1 .

The first end of the second main oil section 22 is connected with the second end of the first main oil section 21 , and the second end of the second main oil section 22 is used to be connected with the lubricating chamber of the camshaft of the engine. The first end of the third main oil section 23 is connected with the second main oil section 22, the second end of the third main oil section 23 is used to be connected with the crankshaft lubricating chamber of the engine, and the feedback oil passage 3 is connected with the third main oil section 23 connected to the second end.

In the embodiment of the present disclosure, the first main oil section 21 is connected to the oil outlet of the oil pump 1 , and the first main oil section 21 is used to deliver lubricating oil to the second main oil section 22 . The second main oil section 22 is used to deliver lubricating oil to the camshaft lubricating cavity in the engine, so that the camshaft in the engine is lubricated, and the third main oil section 23 is used to deliver lubricating oil to the crankshaft lubricating cavity, so as to lubricate the camshaft in the engine Lubricate the crankshaft.

Lubricating oil flows from the first end to the second end of the third main oil section 23 to deliver lubricating oil to the crankshaft in the engine. Since the lubricating oil has friction with the oil channel during the flow, the oil pressure of the lubricating oil will decrease during the flow, that is, the oil pressure of the lubricating oil at the second end of the third main oil section 23 is less than The oil pressure of the first main oil stage 21. Connect the feedback oil passage 3 to the second end of the third main oil section 23, so that the lubricating oil at the second end of the third main oil section 23 can be delivered to the induction end of the oil pump 1 through the feedback oil passage 3, and the oil pump The sensing end of 1 senses the oil pressure of the second end of the third main oil section 23, controls the oil pressure of the oil outlet of the oil pump 1, and provides pressure for the lubricating oil, so that the lubricating oil can flow to the second end of the third main oil section 23. end, so as to lubricate each part of the crankshaft, and realize the real-time adjustment of the oil pressure of the engine's lubrication system.

When in use, when the sensing end of the oil pump 1 detects that the oil pressure at the second end of the third main oil section 23 is small, the oil pressure at the oil outlet of the oil pump 1 can be increased, thereby increasing the oil pressure of the lubricating oil. pressure. When the sensing end of the oil pump 1 detects that the oil pressure at the second end of the third main oil section 23 is high, the oil pressure at the oil outlet of the oil pump 1 can be reduced, thereby reducing the oil pressure of the lubricating oil.

In the embodiment of the present disclosure, the oil pump 1 can also be a two-stage variable displacement oil pump. The two-stage variable displacement oil pump has a sensing end and a control end. The sensing end mainly senses the oil pressure from the feedback oil passage 3. Used to sense pressure. The control end is used to control the pressure of the oil outlet of the oil pump 1 according to the pressure sensed by the sensing end. That is to say, the oil pump 1 is set as a two-stage variable displacement oil pump, so that the oil pressure of the lubricating oil in the lubrication system can be effectively adjusted according to the oil pressure sensed by the sensing end, and the additional pressure loss of the oil pressure can be reduced , to avoid the pressure of the lubricating oil output from the oil pump 1 being affected by the engine speed and temperature, therefore, the oil pressure control is more precise, and the fuel consumption is saved more significantly. Through the preliminary estimation of the oil consumption of the lubricating system of the engine provided by the embodiments of the present disclosure, the fuel consumption of the lubricating system of the engine can be saved by not less than 1%.

Optionally, the main oil gallery 2 also includes a crankshaft oil section 24, the crankshaft oil section 24 is connected to the second end of the third main oil section 23, and the extension direction of the crankshaft oil section 24 is the same as the axial direction of the crankshaft of the engine, so that It is convenient for the crankshaft oil section 24 to lubricate various parts of the crankshaft of the engine.

In the disclosed embodiment, the side wall of the crankshaft oil section 24 has a plurality of crankshaft oil outlet pipes 242 connected to the inner cavity of the crankshaft oil section 24, and the lubricating oil in the crankshaft oil section 24 is connected to the crankshaft lubricating cavity through the crankshaft oil outlet pipes 242 to lubricate the crankshaft.

Exemplarily, a plurality of crankshaft oil outlet pipes 242 are evenly spaced on the side wall of the crankshaft oil section 24 , so that lubricating oil can evenly enter the same crankshaft through hole.

In the disclosed embodiment, the side wall of the crankshaft oil section 24 has an orifice, and the crankshaft oil section 24 is connected with the crankshaft oil outlet pipe 242 through the orifice. In this way, the pressure of the lubricating oil entering the crankshaft oil outlet pipe 242 can be increased through the orifice, so that the lubricating oil in the crankshaft oil outlet pipe 242 can be ejected smoothly.

Optionally, the crankshaft oil outlet pipe 242 is connected with an arc-shaped crankshaft diameter (not shown in the figure), and the crankshaft diameter has channels for the flow of lubricating oil, and the crankshaft diameter delivers the lubricating oil to the crankshaft main shaft of the crankshaft. During the rotation of the crankshaft, the friction force between the main journal of the crankshaft and the bearing bush is reduced.

The side wall of the crankshaft oil section 24 also has a plurality of oil nozzle oil outlet pipes (not shown) that are connected with the inner chamber of the crankshaft oil section 24, and a plurality of crankshaft oil outlet pipes 242 can be evenly connected with a plurality of oil nozzle oil outlet pipes. Interval arrangement. The lubricating oil in the crankshaft oil section 24 is delivered to the injector through the oil outlet pipe of the injector, so that the injected lubricating oil can cool the piston inside the cylinder block 100 .

Since the lubricating oil not only has the function of lubricating, but also has the function of cooling, the lubricating oil is sprayed on the piston through the oil outlet pipe of the oil nozzle, which can reduce the temperature of the piston and avoid the damage of the piston caused by engine knocking caused by excessive temperature. damage.

Optionally, the main oil gallery 2 also includes a connecting oil section 25 and a camshaft oil section 26 . The first end of the connecting oil section 25 is connected with the second end of the second main oil section 22 , and the second end of the connecting oil section 25 is connected with the camshaft oil section 26 . The extension direction of the camshaft oil section 26 is the same as that of the crankshaft oil section 24 , and the camshaft oil section 26 and the connecting oil section 25 are vertically arranged. The camshaft oil section 26 is used to be connected with the camshaft lubricating chamber of the engine.

In the above implementation manner, the connecting oil section 25 is used to introduce lubricating oil from the second main oil section 22 into the camshaft oil section 26, and the camshaft oil section 26 is used to lubricate the camshaft of the engine. Since the extension direction of the crankshaft in the automobile is the same as that of the camshaft, the extension direction of the camshaft oil section 26 is the same as that of the crankshaft oil section 24 . In this way, various positions of the camshaft can be lubricated through the camshaft oil section 26 .

In actual use, lubricating oil enters the oil pump 1 through the oil inlet of the oil pump 1, and the oil pump 1 outputs the lubricating oil to the first main oil section 21 through the oil outlet of the oil pump 1, and then the lubricating oil passes through the first main oil section 21. The oil section 21 enters the second main oil section 22 , and then enters the camshaft oil section 26 through the connecting oil section 25 . Lubricating oil flows into the outer wall of the camshaft through the camshaft oil section 26 to lubricate the camshaft.

In this embodiment, the connecting oil section 25 is arranged in the cylinder head of the engine. The connecting oil section 25 is arranged perpendicular to the camshaft oil section 26 .

Because the camshaft oil section 26 is vertically arranged with the connecting oil section 25, that is, the extending direction of the connecting oil section 25 is perpendicular to the extending direction of the camshaft oil section 26, so that the length of the connecting oil section 25 is the shortest, and the connecting oil section 25 is reduced. The volume occupied in the cylinder head makes the cylinder head smaller, thereby reducing the volume of the entire engine.

Optionally, there are two camshaft oil segments 26 . One camshaft oil section 26 is located on the intake side of the engine, which can be called the intake side camshaft oil section 261, and one camshaft oil section 26 is located on the exhaust side of the engine, which can be called the exhaust side camshaft oil section 262. The camshaft oil section 261 on the intake side delivers lubricating oil to the camshaft lubricating cavity on the intake side to lubricate the camshaft on the intake side. The exhaust side camshaft oil section 262 delivers lubricating oil to the exhaust side camshaft lubricating chamber to lubricate the exhaust side camshaft.

In this embodiment, the camshaft oil section 261 on the intake side has the same structure as the camshaft oil section 262 on the exhaust side. Here, the camshaft oil section 261 on the intake side is taken as an example for a brief introduction.

Optionally, the side wall of the intake-side camshaft oil section 261 has a plurality of intake-side camshaft oil outlet pipes 2611 connected to the inner cavity of the intake-side camshaft oil section 261 , and the intake-side camshaft oil section 261 The lubricating oil lubricates the intake side camshaft through the intake side camshaft oil outlet pipe 2611.

Optionally, an arc-shaped intake-side camshaft oil outlet plate 2612 is also connected to the intake-side camshaft oil outlet pipe 2611, and the intake-side camshaft oil outlet plate 2612 delivers lubricating oil to the side of the intake-side camshaft. On the wall, during the rotation of the intake side camshaft, the friction force between the intake side camshaft and the through hole of the intake side camshaft is reduced.

Optionally, the main oil passage 2 also includes a supercharger oil section 27, the first end of the supercharger oil section 27 is connected to the second main oil section 22, and the second end of the supercharger oil section 27 is connected to the supercharger The lubricating chamber is connected.

In the above implementation manner, the lubricating oil in the second main oil section 22 flows to the turbocharger of the engine through the supercharger oil section 27 to provide lubrication for the turbocharger. Arranging the supercharger oil section 27 reduces the difficulty of oil passage arrangement in the later stage.

In the embodiment of the present disclosure, when not in use, the supercharger oil section 27 can be sealed by a bowl-shaped plug or a plugging process.

Referring again to FIG. 1 , the main oil passage 2 also includes a timing chain oil section 28 , which is connected to the inner cavity of the third main oil section 23 . The lubricating oil is delivered to the timing chain lubricating cavity through the timing chain oil section 28 to lubricate the timing chain to ensure the smooth operation of the timing chain. The timing chain oil section 28 is directly connected to the inner cavity of the third main oil section 23 instead of being led out separately, which not only reduces the blockage problem of the oil passage here, but also reduces the number of parts and saves cost.

Optionally, the lubricating system of the engine also includes an oil return channel 4 . The first end of the oil return channel 4 is used to be connected with the lubricating cavity of the engine, and the second end of the oil return channel 4 is used to be connected with the oil pan of the engine.

The oil return channel 4 enables the lubricating oil accumulated in the lubricating chamber in the cylinder head 200 to quickly flow back to the oil pan, improving the recovery efficiency of the engine oil in the cylinder head 200 .

Optionally, the oil return channel 4 includes at least one first oil return section 41 , at least one second oil return section 42 and multiple third oil return sections 43 .

The minimum included angle between the extension direction of the first oil return section 41 and the camshaft oil section 26 is less than 90 degrees, and the extension direction of the first oil return section 41 is the direction from the first end to the second end of the first oil return section 41 . The first oil return section 41 is used to be connected with the crankshaft lubricating chamber of the engine. The second oil return section 42 is arranged corresponding to the first oil return section 41, the first end of the second oil return section 42 is connected to the corresponding first oil return section 41, and the second oil return section 42 is connected to the corresponding first oil return section 41. The oil section 41 is arranged vertically, and the second end of the second oil return section 42 is used to connect with the oil pan of the engine. A plurality of third oil return sections 43 and the second oil return section 42 are arranged in parallel with each other at intervals, and the first end of the third oil return section 43 is used to be connected with the crankshaft lubricating chamber of the engine, and the second end of the third oil return section 43 The end is used to connect with the oil pan of the engine.

The oil return channel 4 is designed as the first oil return section 41, the second oil return section 42 and the third oil return section 43, so that a buffer structure can be formed through the first oil return section 41 to effectively reduce the impact of lubricating oil on the oil pan liquid. The splashing effect of the surface, thereby reducing the air content of the lubricating oil in the engine.

Exemplarily, in order to improve the buffering effect, the first oil return section 41 is arranged parallel to the horizontal plane.

Optionally, the middle part of the second oil return section 42 has a first reducing section 421 . The inner diameter of the middle portion of the first diameter reducing section 421 is larger than the inner diameters of both ends. And the inner diameter of the first end of the second oil return section 42 is smaller than the inner diameter of the second end of the second oil return section 42 , and the inner diameter of the second end of the second oil return section 42 is smaller than the inner diameter of the first reducing section 421 .

Since the inner diameter of the middle part of the first variable diameter section 421 is larger than the inner diameters of both ends, this can effectively reduce the flow velocity of lubricating oil in the second oil return section 42, so as to further reduce the splashing effect of lubricating oil on the liquid surface of the oil pan.

In this embodiment, in order to improve the smooth flow of lubricating oil along the oil return channel 4 , the inner diameter of the first diameter-reducing section 421 first gradually increases and then gradually decreases along its own axis.

Optionally, the middle part of the third oil return section 43 has a second diameter-reducing section 431 , and the inner diameter of the middle part of the second diameter-reducing section 431 is larger than the inner diameters of both ends. The inner diameter of the first end of the third oil return section 43 is smaller than the inner diameter of the second end of the third oil return section 43 , and the inner diameter of the second end of the third oil return section 43 is smaller than the inner diameter of the second reducing section 431 .

Since the inner diameter of the middle part of the second variable diameter section 431 is greater than the inner diameters of both ends, this can effectively reduce the flow velocity of lubricating oil in the third oil return section 43, so as to further reduce the splashing effect of lubricating oil on the liquid surface of the oil pan.

In this embodiment, in order to improve the smooth flow of lubricating oil along the oil return passage 4, in the direction from the first end to the second end of the second oil return section 42, the inner diameter of the first variable diameter section 421 is first along its own axis. Gradually increase and then gradually decrease. In the direction from the first end to the second end of the third oil return section 43 , the inner diameter of the second diameter reducing section 431 first gradually increases and then gradually decreases along its own axis.

In this embodiment, in order to improve the processing efficiency of the oil return passage 4, the second oil return section 42 and the third oil return section 43 have the same structure.

Optionally, the lubricating system of the engine further includes a machine filter module 5 . The oil inlet of the machine filter module 5 is connected to the first end of the first main oil section 21 , and the oil outlet of the machine filter module 5 is connected to the first end of the second main oil section 22 .

In the above implementation, the machine filter module 5 is used to cool and filter the lubricating oil, the oil inlet of the machine filter module 5 is connected to the first main oil section 21, and the oil outlet of the machine filter module 5 is connected to the second main oil section 21. The first end of the section 22 is connected, so that the lubricating oil delivered by the oil pump 1 can be cooled and filtered by the machine filter module 5, and then sent to the second main oil section 22 and the third main oil section 23 to avoid the lubricating oil Impurities clog the lubricating chamber of the engine.

Exemplarily, the machine filter module 5 can be an integrated component formed by the oil cooler and the oil filter, and the engine lubrication system provided by the embodiment of the present disclosure cancels the traditional oil filter connecting seat and the bolts attached to the machine filter connecting seat , and directly integrate the oil cooler and the oil filter, which not only effectively reduces the cost of the engine, but also makes the arrangement of the engine more compact.

Exemplarily, a third oil return section 43 close to the machine filter module 5 is connected to the oil discharge port of the machine filter module 5, so that the dirty oil in the machine filter module 5 can be drained in time, so that the machine filter module 5 Keep clean lubricating oil inside.

Of course, under normal working conditions, a third oil return segment 43 close to the machine filter module 5 and the oil inlet of the machine filter module 5 are in a blocked state. Only when the machine filter module 5 drains oil, the third oil return The section 43 is connected to the oil inlet of the machine filter module 5 .

The lubricating system of the engine provided by the embodiment of the present disclosure also includes a collector (not shown in the figure), the collector is used to collect the lubricating oil in the oil pan, and the collector is connected with the oil inlet of the oil pump 1, and the oil pump 1 The lubricating oil flowing to the oil sump is output and lubricated again, so that the lubricating system of the engine forms a circulation system.

In the embodiment of the present disclosure, the collector can be integrated on the oil pump 1 to reduce the volume of the lubricating system of the engine.

In this embodiment, the oil passages mentioned above are all realized by casting, which can reduce the difficulty of processing the oil passages and reduce the cost of the engine simultaneously.

Fig. 2 is a schematic structural view of a cylinder block of an engine provided by an embodiment of the present disclosure, and Fig. 3 is a schematic structural view of a cylinder head of an engine provided by an embodiment of the present disclosure. With reference to Figs. 2 and 3, in an embodiment of the present disclosure, a A kind of engine, engine comprises cylinder block 100, cylinder head 200, oil sump and above-mentioned said lubricating system. There is a crankshaft lubricating chamber inside the cylinder block 100 . The cylinder head 200 sealing cover is arranged on the top of the cylinder block 100 . The cylinder head 200 has a camshaft lubricating cavity inside, and the camshaft lubricating cavity is used for arranging the camshaft. The oil pan is connected to the bottom of the cylinder block 100 . The lubricating system is connected to the side walls of the cylinder block 100 and the cylinder head 200 . The lubrication system is connected with the camshaft lubricating chamber and the crankshaft lubricating chamber.

The crankshaft lubricating chamber is used to arrange the crankshaft. The power unit of the engine drives the crankshaft to rotate, and the crankshaft drives other accessories on the engine to work. The function of the camshaft is to control the opening and closing of the valves. The smooth rotation of the camshaft in the engine can ensure the normal operation of the engine. The lubricating oil is sent to the camshaft through the intake side camshaft oil section and the exhaust side camshaft oil section, so that the camshaft can rotate smoothly.

Optionally, the cylinder head 200 includes a first cover body 2001 and a second cover body 2002 . The first cover 2001 is connected to the top of the cylinder body 100 , the second cover 2002 covers the first cover 2001 , and the camshaft oil section 26 is located on the second cover 2002 . The connecting oil section 25 is located on the first cover 2001 .

The cylinder head 200 is divided into two parts, so that the lubricating part of the main journal of the camshaft can be designed on the second cover 2002, and the lubrication of other parts can be designed on the second cover 2002, so as to facilitate the arrangement of oil passages and effectively reduce The overall arrangement space of the engine.

Exemplarily, the engine in the embodiment of the present disclosure is a four-cylinder engine, that is, it includes four cylinder chambers, and gas is burned in the four cylinder chambers to convert chemical energy into mechanical energy to drive the engine to run. Certainly, the engine can be other multi-cylinder engines, such as three cylinders and the like.

The above descriptions are only optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection of the present disclosure. within range.

Claims

A lubricating system for an engine, characterized in that the lubricating system includes an oil pump (1), a main oil passage (2) and a feedback oil passage (3);

The displacement of the oil pump (1) is variable throughout, and the oil inlet of the oil pump (1) is used to connect with the oil pan of the engine;

The oil inlet of the main oil passage (2) is connected with the oil outlet of the oil pump (1), and the oil outlet of the main oil passage (2) is used to be connected with the lubricating chamber of the engine;

The first end of the feedback oil passage (3) is connected to the main oil passage (2), and the second end of the feedback oil passage (3) is connected to the sensing end of the oil pump (1);

The oil pump (1) is configured to adjust the oil pressure of the oil outlet of the oil pump (1) according to the oil pressure fed back by the feedback oil passage (3).
The lubricating system of the engine according to claim 1, characterized in that, the main oil gallery (2) comprises a first main oil section (21), a second main oil section (22) and a third main oil section (23 );

The first end of the first main oil section (21) is connected to the oil outlet of the oil pump (1);

The first end of the second main oil section (22) is connected with the second end of the first main oil section (21), and the second end of the second main oil section (22) is used for connecting with the The camshaft lubricating chamber of the engine is connected;

The first end of the third main oil section (23) is connected with the second main oil section (22), and the second end of the third main oil section (23) is used for lubricating the crankshaft of the engine The cavity is connected, and the feedback oil passage (3) is connected with the second end of the third main oil section (23).
The lubricating system of the engine according to claim 2, characterized in that, the main oil gallery (2) also includes a crankshaft oil section (24);

The crankshaft oil section (24) is connected with the second end of the third main oil section (23), and the crankshaft oil section (24) is used to be connected with the crankshaft lubricating chamber of the engine.
The lubricating system of the engine according to claim 3, characterized in that, the main oil gallery (2) also includes a connecting oil section (25) and a camshaft oil section (26);

The first end of the connecting oil section (25) is connected with the second end of the second main oil section (22), and the second end of the connecting oil section (25) is connected with the camshaft oil section (26 ) connected;

The extension direction of the camshaft oil section (26) is the same as that of the crankshaft oil section (24), and the camshaft oil section (26) is used to be connected with the camshaft lubricating chamber of the engine.
The lubricating system of the engine according to claim 4, characterized in that, the extension direction of the connecting oil section (25) is perpendicular to the extension direction of the camshaft oil section (26).
The lubricating system of the engine according to claim 2, characterized in that the lubricating system also includes a machine filter module (5);

The oil inlet of the machine filter module (5) is connected to the first end of the first main oil section (21), and the oil outlet of the machine filter module (5) is connected to the second main oil section (22) ) connected to the first end.
The lubricating system of the engine according to any one of claims 1-6, characterized in that the lubricating system further comprises an oil return channel (4);

The first end of the oil return passage (4) is used to connect with the lubricating chamber of the engine, and the second end of the oil return passage (4) is used to connect with the oil sump of the engine.
The lubricating system of the engine according to claim 7, characterized in that, the oil return passage (4) comprises at least one first oil return section (41), at least one second oil return section (42) and a plurality of first oil return sections (42) Three return oil sections (43);

The angle between the extension direction of the first oil return section (41) and the horizontal plane is less than 90 degrees, and the first oil return section (41) is used to connect with the camshaft lubricating chamber of the engine;

The second oil return section (42) is arranged in one-to-one correspondence with the first oil return section (41), and the first end of the second oil return section (42) is connected to the corresponding first oil return section (41) are connected, and there is an angle between the second oil return section (42) and the corresponding first oil return section (41), the second end of the second oil return section (42) is used connected to the oil pan of said engine;

A plurality of the third oil return sections (43) and the second oil return sections (42) are arranged in parallel with each other at intervals, and the first ends of the third oil return sections (43) are used for connecting with the engine. The camshaft lubricating cavity is connected, and the second end of the third oil return section (43) is used to connect with the oil pan of the engine.
The lubricating system of the engine according to claim 8, characterized in that, the middle part of the second oil return section (42) has a first reducing section (421);

The inner diameter of the middle part of the first diameter reducing section (421) is larger than the inner diameters of both ends.
The lubrication system of the engine according to claim 9, characterized in that, the inner diameter of the first end of the second oil return section (42) is smaller than the inner diameter of the second end of the second oil return section (42), and the The inner diameter of the second end of the second oil return section (42) is smaller than the inner diameter of the first diameter reducing section (421).
The lubricating system of the engine according to claim 8, characterized in that, the middle part of the third oil return section (43) has a second reducing section (431);

The inner diameter of the middle part of the second diameter reducing section (431) is larger than the inner diameters of both ends.
The lubrication system of the engine according to claim 11, characterized in that, the inner diameter of the first end of the third oil return section (43) is smaller than the inner diameter of the second end of the third oil return section (43), and the The inner diameter of the second end of the third oil return section (43) is smaller than the inner diameter of the second diameter reducing section (431).
An engine, characterized in that the engine comprises a cylinder block (100), a cylinder head (200), an oil pan, and the lubrication system of the engine according to any one of claims 1 to 9;

There is a crankshaft lubricating chamber inside the cylinder block (100);

The sealing cover of the cylinder head (200) is arranged on the top of the cylinder body (100), and the inside of the cylinder head (200) has a camshaft lubricating chamber;

The oil pan is connected to the bottom of the cylinder (100);

The lubricating system is connected with the side walls of the cylinder block (100) and the cylinder head (200), and the lubricating system is connected with the lubricating chamber of the camshaft and the lubricating chamber of the crankshaft.