CN214741542U - Forced circulation device for engine oil of gasoline engine - Google Patents

Abstract

The utility model relates to the technical field of gasoline engines, in particular to a gasoline engine oil forced circulation device, which comprises an engine oil tank, a crankcase, a crankshaft, a cylinder, an air valve chamber, a cam chamber and a timing gear, wherein a one-way valve which can lead oil from the crankcase to the engine oil tank in one way is arranged between the engine oil tank and the crankcase; a channel leading to the space between the cylinder and the cylinder seat is arranged in the oil tank; the left end of bent axle is equipped with left oil inlet and communicates to the low level of machine oil case through the rubber tube, and the right-hand member is equipped with right oil inlet and communicates to the high level of machine oil case through the rubber tube equally. The utility model has the advantages of power loss is little, lubricated condition and lubricated effect are splendid, self-adaptation ability is strong when the oil level changes, machine heat-sinking capability has been improved greatly.

Description

Forced circulation device for engine oil of gasoline engine

Technical Field

The utility model relates to a gasoline engine technical field specifically relates to a gasoline engine machine oil forced circulation device.

Background

Small gasoline engines are widely used. The multifunctional mower is not only used for mowing and cutting shrubs, but also can drive a small scarifier, a water pump, a ground auger, a sprayer and the like. Because the two-stroke power has simple structure and easy manufacture, most of the prior garden tools mainly use the two-stroke power. The two-stroke engine has no intake and exhaust valve, no complicated valve mechanism and lubricating device and is simpler than the four-stroke engine in structure. Compared with the four-stroke power, the two-stroke power with the same displacement has the advantages of low manufacturing cost, low failure rate and convenient maintenance. Meanwhile, the crankshaft of the two-stroke engine rotates for one circle to do work once, and the crankshaft of the four-stroke engine rotates for two circles to do work once. Therefore, the two-stroke engine with the same displacement has high power compared with the four-stroke engine, and has light weight due to simple structure and larger power-weight ratio. And the two-stroke engine has the following characteristics: an engine employing a diaphragm carburetor can operate normally even if the engine is rotated 360, which is not comparable to a four-stroke engine. But the advantages of the two-stroke engine are just the disadvantages thereof. So called, either failure or involuntary. The four strokes of a two-stroke engine must be completed within one revolution of the crankshaft, and thus many strokes are overlapped in time. Such as intake and compression strokes, power and exhaust strokes. A special ventilation process is also included. Because the working cycle time is short, the air intake and exhaust processes of the two-stroke engine only account for 130-150 degrees of the rotation angle of the crankshaft, the air intake and exhaust processes are almost simultaneously carried out, fresh mixed gas is used for sweeping the waste gas, some fresh mixed gas inevitably flows out of an exhaust port along with the waste gas, and the waste gas is not easy to be cleaned. Therefore, the two-stroke internal combustion engine has poor ventilation quality, low fuel utilization rate and high oil consumption of the whole engine. The two-stroke engine lubrication is performed by two-stroke engine oil mixed with the mixed oil. The used mixed oil needs to be prepared by mixing the two-stroke engine oil and the gasoline according to a certain proportion and shaken up for use, and has certain inconvenience for use.

The four-stroke engine has the advantages that: because the air intake and the air exhaust are independent, the crankshaft rotates for two circles in one working cycle of the four-stroke engine. Therefore, the air intake and exhaust time is long, the air intake efficiency is high, the combustion is sufficient, and the fuel is economical and saving. Because of the air intake and exhaust mode, the stroke of the piston can be designed to be longer than the two strokes, the acting time of the gas on the piston is greatly prolonged, the fuel energy utilization rate can be greatly improved, and the output at the medium and low speed is much larger than that of the two strokes. And the output force can be consistent under the working conditions of light and heavy loads. The four-stroke engine is provided with a special engine oil tank, and the gasoline and the engine oil are added separately, so that the four-stroke engine is convenient to use. The disadvantage of four-stroke: because the crankshaft of a four-stroke engine does work once every two cycles of operation, the power of the same displacement engine is less than that of a two-stroke engine. The four-stroke engine is more complicated than a two-stroke engine in valve actuating mechanism and has more lubricating oil paths. Generally, the more complex the machine, the higher the failure rate, and thus the higher the failure rate of a four-stroke engine as compared to a two-stroke engine.

At present, with the understanding of people about garden tools, a four-stroke engine saves oil, engine oil is directly added into an oil tank (mixed oil is not required to be prepared), gasoline can be directly added, and more people tend to select the four-stroke engine as garden tool power. Two-stroke engine power is mostly applied to earth drills, chain saws with high power requirements, or machines which need to change the working direction during working, such as hedge trimmers, chain saws and the like.

Although four-stroke power is convenient to use, the design of a lubricating oil path is difficult. The engine oil of the four-stroke engine has three main functions, namely lubrication, partial heat of high-temperature parts (such as a piston, a cylinder and the like) is taken away, so that the high-temperature parts do not exceed a normal working range, and impurities generated in the moving process of moving parts are taken away. If the design does not achieve the purpose, the engine is easy to cause abnormal phenomena such as dry grinding of the piston, overheating of the engine and the like.

SUMMERY OF THE UTILITY MODEL

First, technical problem to be solved

The utility model discloses an above-mentioned defect to prior art exists, specially provide a gasoline engine machine oil forced circulation device, solved the lubricated problem of the circulation of the machine oil of current gasoline engine and gasoline engine.

Second, technical scheme

In order to solve the technical problem, the utility model provides a gasoline engine machine oil forced circulation device, including the oil tank, crankcase, bent axle, cylinder, valve chamber, cam chamber and the timing gear that constitute the engine, the oil tank comprises oil pan and cylinder block, and the crankcase comprises the airtight space that cylinder block and cylinder formed, be equipped with the check valve that can supply fluid to lead to the oil tank from the crankcase one-way between oil tank and the crankcase, the check valve comprises check valve set screw, check valve spacing seat and diaphragm, fixes the diaphragm on the cylinder block through check valve set screw and check valve spacing seat;

a channel leading to between the cylinder and the cylinder seat is arranged in the engine oil tank, the channel simultaneously leads to the cylinder and the valve chamber, and a rubber one-way valve is arranged in the direction leading to the cylinder of the channel;

the one-way valve limiting seat is provided with a plurality of damping holes, one damping hole is upwards communicated to the position right below the timing gear in the cam chamber, and the rest damping holes are directly communicated with the space where the diaphragm is located;

the left end of bent axle is equipped with left oil inlet and communicates to the low level of machine oil case through the rubber tube, and the right-hand member is equipped with right oil inlet and communicates to the high level of machine oil case through the rubber tube equally.

Preferably, the valve inflow passage of the rubber check valve terminates in a through hole formed in the cylinder wall, and the oil mist flowing out of the through hole lubricates the piston and the cylinder.

Preferably, the check valve limiting seat is provided with a small hole lower than the liquid level of the engine oil.

Preferably, the channel comprises, in combination,

the first channel is communicated upwards to a through hole on the cylinder wall;

the second channel is communicated upwards to a through hole on the cylinder wall;

the lower end of the third channel is communicated with a damping hole, and the upper end of the third channel is communicated to the position right below the timing gear;

the fourth channel is communicated upwards to the valve chamber;

a fifth channel communicated upwards to the valve chamber;

and a sixth passage communicated upward to the valve chamber.

Preferably, bearings are arranged at two ends of the crankshaft, grooves are machined in positions where the bearings are located, and oil mist enters the channel IV and then enters the channel V and the channel VI through the two grooves respectively.

Preferably, the two ends of the crankcase are respectively sealed by the first oil seal and the second oil seal to close the outlet of the crankshaft, so that the crankcase is a relatively independent sealed space.

Third, beneficial effect

Compared with the prior art, the circulating device of the utility model separates the engine oil tank from the crankcase, and the crankcase has no engine oil, the crankshaft has small rotating resistance and small power loss; meanwhile, a special channel is arranged to lubricate the cylinder wall, oil mist lubricates a crankshaft needle roller bearing and a piston needle roller bearing from the middle through a crankshaft inner channel and a crank throw, and the lubricating condition is greatly improved.

Oil mist lubrication is adopted for engine oil lubrication, and the oil mist lubrication effect is excellent; the engine oil realizes automatic adjustment of high and low oil levels, and has strong self-adaptive capacity when the oil level changes.

Meanwhile, the crankcase, the valve chamber and the cam chamber are filled with oil mist, and the flowing of the oil mist can take away part of the heat of the cylinder piston, so that the heat dissipation capacity of the machine is greatly improved.

Drawings

Fig. 1 is a first principle diagram of the complete machine lubrication of the present invention.

Fig. 2 is a schematic diagram of the overall lubrication of the present invention.

Fig. 3 is a structure diagram of the crankshaft connecting rod piston assembly of the present invention.

Fig. 4 is a schematic view of the valve chamber lubrication according to the present invention.

In the figure:

1. an oil pan; 2. a cylinder block; 3. a rubber check valve; 4. a cylinder; 5. a piston pin; 6. a piston needle bearing; 7. a piston; 8. a valve chamber; 9. a check valve fixing screw; 10. a one-way valve limiting seat; 11. a one-way valve diaphragm; 12. a valve chamber cover; 13. a crankshaft; 14. a first oil seal; 15. a bearing; 16. a cam chamber; 17. a first channel; 18. a second oil seal; 19. a timing gear; 20. a second channel; 21. channel three; 22. channel four; 23. a channel number five; 24. a channel number six; 25. an oil sump; 26. a crankcase; 27. a damping hole; 28. a left oil inlet; 29. and a right oil inlet.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Example 1:

referring to fig. 1 to 4, the oil tank 25 of the forced oil circulation device of the present embodiment communicates with the crankcase 26 through a check valve. The non-return valve and the sump 25 constitute a simple oil mist generator. When the piston moves towards bottom dead center, the crankcase 26 pressure is greater than the sump 25 pressure. Under the action of the pressure difference, the engine oil or air in the crankcase 26 can flow to the engine oil tank 25 through the check valve and then is ejected at a high speed through two small holes on the check valve limiting seat. After the engine oil is added into the engine according to the standard, the oil level in the engine oil tank 25 is higher than that of the check valve limiting seat, and the two small holes in the check valve limiting seat 10 are below the liquid level of the engine oil. The air ejected from the crankcase 26 enters directly into the engine oil, forming a large amount of oil bubbles, an oil mist. In addition, the machine vibrates, so that a mixture of oil mist and engine oil with bubbles is formed, and the volume of the engine oil is increased; at the same time, the pressure in the sump 25 increases. When the piston is operating towards tdc, the pressure in the crankcase 26 is less than the pressure in the sump 25, the check valve closes and the passage between the sump 25 and the crankcase 26 is cut off. The oil sump 25 has a passage leading to a passage between the cylinder and the cylinder block, which leads to a cylinder wall lubrication passage provided with a rubber check valve on the cylinder. The valve flow passage of the rubber one-way valve is terminated by a through hole in the cylinder wall, and oil mist flowing out of the through hole lubricates the piston and the cylinder. This channel opens into both the valve chamber 8 and the valve chamber cover 12. When the pressure in the engine oil tank 25 is high, one of the oil mist flows to the valve chamber, and the other oil mist flows to the valve chamber cover 12 and flows out from the opening of the valve chamber cover 12, so that the valve chamber is lubricated in all directions. When the redundant engine oil in the valve chamber flows downwards under the action of gravity, the redundant engine oil returns to the engine oil chamber through the original path. The oil or air in the crankcase 26 cannot return to the crankcase 26 due to the check valve.

The other lubricating oil path of the engine oil forced circulation device is a crankshaft lubricating oil path. This oil circuit has two pipelines: the oil pan is received through the rubber tube to the left side, is in the lower position of oil level, guarantees that the bent axle still guarantees that bent axle organic oil leads to crank throw department under the less condition of machine oil, then splashes oil to the cylinder wall under the effect of centrifugal force on, guarantees the most basic lubrication condition between piston and the cylinder. The right rubber tube is connected to the top of the oil tank 25 of the cylinder block, when too much oil is in the oil tank 25 and the oil level is too high, the oil tank 25 is conveyed to the crankshaft through the channel to form oil mist containing more oil, so that part of the oil is transferred to the crankcase 26, and the normal oil level of the oil tank 25 is ensured; when the oil level of the oil tank 25 is normal, the oil mist entering the right passage is normal oil mist, and no much oil enters the crankcase 26, thereby stabilizing the oil level of the oil tank 25.

The core component of the engine oil forced circulation device of the utility model is a one-way valve. The component consists of a one-way valve fixing screw 9, a one-way valve limiting seat 10 and a diaphragm 11. The one-way valve diaphragm 11 is fixed on the cylinder seat 2 through the one-way valve fixing screw 9 and the one-way valve limiting seat 10. The oil pan 1 and the cylinder block 2 are screwed together to form an oil tank 25. The closed space of the cylinder block 2 and the cylinder 4 constitutes an engine crankcase 26. The two ends of the crankcase 26 are respectively sealed by a first oil seal 14 and a second oil seal 18 to close the outlet of the crankshaft 13, the model of the first oil seal 14 is 12X32X7, and the model of the second oil seal 18 is 10X20X5, so that the crankcase 26 is a relatively independent sealed space. When the piston 7 moves to the bottom dead center rapidly and the pressure in the crankcase 26 is too high, the check valve diaphragm 11 is completely attached to the check valve limiting seat 10, so that the check valve diaphragm 11 is prevented from being deformed too much and being irreversibly permanently deformed to fail. Three damping holes 27 are arranged on the check valve limiting seat 10. The intermediate orifice 27 opens through the third passage 21 directly below the timing gear 19. When the pressure in the oil tank 25 is high, the pressure in the oil tank 25 is not greatly affected because the hole is not large. While the oil mist ejected through this hole is directly ejected onto the timing gear 19. The timing gear 19 rotates at a high speed, so that the cam chamber 16 is filled with oil mist by centrifugal force, thereby lubricating moving parts such as the cam gear. When the pressure in the oil tank 25 is not high, the oil in the cam chamber 16 can flow back to the oil tank 25 by gravity. The other two damping holes 27 are in direct communication with the space in which the check valve diaphragm 11 is located. When the piston 7 moves to the bottom dead center, the pressure in the crankcase 26 increases rapidly, and the oil and air in the crankcase pass through the check valve diaphragm 11 rapidly under the pressure and are ejected from the two damping holes 27, so that the oil in the oil tank 25 is stirred rapidly to form oil mist and oil mixed with a large amount of air. The volume of the oil expands and the pressure in the oil tank 25 increases. Under the action of the pressure, the air flows to the cylinder wall through the first passage 17 and the second passage 20. As shown in fig. 1 and 2. At this point, the oil mist is sprayed once before the piston 7 reaches the cylinder wall. The lubrication conditions are greatly improved when the piston 7 passes. When the crankshaft 13 rotates half a revolution to the bottom dead center position, the left and right oil inlets 28, 29 of the crankshaft 13 rotate to just the rear position (see fig. 3). Therefore, the piston 7 is ensured to move from the top dead center to the bottom dead center, the left oil inlet 28 and the right oil inlet 29 of the crankshaft 13 are both in the closed position, the pressure in the oil tank 25 can be ensured to be large, and the rubber one-way valve 3 can be opened better. When the crankshaft 13 rotates 90 degrees, the left oil inlet 28 and the right oil inlet 29 of the crankshaft 13 are opened, and a piece of oil mist directly irradiates the crank throw of the crankshaft 13 through the channel. At this time, the piston 7 is not far from the bottom dead center and directly splashes to the piston pin 5 and the piston needle bearing 6 under the action of centrifugal force. Therefore, the piston pin 5 and the piston needle bearing 6 are well lubricated.

Example 2:

in this embodiment, the intake and exhaust valves are opened and closed once per cycle, as compared to embodiment 1, and thus the valve chamber is also a place with many moving parts in the four-stroke engine. The oil mist formed by the oil reservoir 25 directly enters the valve chamber 8 through the fourth passage 22, the fifth passage 23, and the sixth passage 24 for lubrication. In operation, the valve chamber 8 is filled with oil mist sprayed from the sump 25. The oil mist from the oil tank 25 enters the bearing position through the fourth passage 22 below the bearing 15, a groove is formed on the bearing position, and the oil mist enters the fifth passage 23 and the sixth passage 24 after passing through the groove and finally enters the valve chamber 8. With each time the piston 7 moves towards bottom dead center, the oil sump 25 pressure rises and the oil mist comes up. When the piston 7 moves to the top dead center, the oil tank 25 is depressurized. The oil mist flows back to the crankcase 26 under the influence of gravity. When oil mist is sprayed, the oil that flows back to the oil tank 25 is oil mist, and the oil flows back less. When a large amount of oil is sprayed, a large amount of oil is collected in the fourth passage 22, and the pure oil flows back to the oil tank 25, and a large amount of oil returns to the oil tank 25. Thereby achieving the purpose of automatically adjusting the engine oil amount in the valve chamber 8.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A forced oil circulation device of a gasoline engine comprises an oil tank (25), a crankcase (26), a crankshaft (13), a cylinder (4), a valve chamber (8), a cam chamber (16) and a timing gear (19) which form an engine, wherein the oil tank (25) consists of an oil pan (1) and a cylinder seat (2), and the crankcase (26) consists of a closed space formed by the cylinder seat (2) and the cylinder (4), and is characterized in that a one-way valve for supplying oil to the oil tank (25) from the crankcase (26) in a one-way manner is arranged between the oil tank (25) and the crankcase (26), the one-way valve consists of a one-way valve fixing screw (9), a one-way valve limiting seat (10) and a membrane (11), and the membrane (11) is fixed on the cylinder seat (2) through the one-way valve fixing screw (9) and the one-way valve limiting seat (10);

a channel leading to the space between the cylinder (4) and the cylinder seat (2) is arranged in the oil tank (25), the channel simultaneously leads to the cylinder (4) and the valve chamber (8), and a rubber check valve (3) is arranged in the direction leading to the cylinder (4) of the channel;

a plurality of damping holes (27) are formed in the one-way valve limiting seat (10), one damping hole (27) is upwards communicated with the right lower part of the timing gear (19) in the cam chamber (16), and the rest damping holes (27) are directly communicated with the space where the diaphragm (11) is located;

the left end of the crankshaft (13) is provided with a left oil inlet (28) and communicated to the low position of the engine oil tank (25) through a rubber pipe, and the right end of the crankshaft is provided with a right oil inlet (29) and communicated to the high position of the engine oil tank (25) through the rubber pipe.

2. A forced oil circulation device for a gasoline engine as defined in claim 1, wherein the valve flow passage of the rubber check valve (3) terminates in a through hole formed in the cylinder wall, and the oil mist flowing out of the through hole lubricates the piston and the cylinder.

3. The forced oil circulation device of the gasoline engine as claimed in claim 1, wherein the check valve limiting seat (10) is provided with a small hole lower than the oil level.

4. The forced oil circulation device for a gasoline engine according to claim 1, wherein said passage comprises,

a first passage (17) which is communicated with the through hole on the cylinder wall upwards;

a second channel (20) communicated upwards to a through hole on the cylinder wall;

a third channel (21), the lower end of which is communicated with a damping hole (27), and the upper end of which is communicated to the right below the timing gear (19);

a fourth passage (22) communicating upward to the valve chamber (8);

a fifth passage (23) communicating upward to the valve chamber (8);

and a sixth passage (24) which communicates upward to the valve chamber (8).

5. The forced oil circulation device of the gasoline engine as claimed in claim 4, wherein bearings (15) are provided at both ends of the crankshaft (13), grooves are formed at the positions of the bearings (15), and oil mist enters the channel number four (22) and then enters the channel number five (23) and the channel number six (24) through the two grooves.

6. The forced oil circulation device of a gasoline engine as defined in claim 1, wherein the two ends of the crankcase (26) are respectively sealed by the first oil seal (14) and the second oil seal (18) to close the outlet of the crankshaft (13), so that the crankcase (26) is a relatively independent sealed space.

Images