CN219220548U - Lubricating device of four-stroke engine - Google Patents

Abstract

The utility model discloses a lubricating device of a four-stroke engine, which comprises a cylinder body, wherein a piston body is arranged on one side of the inside of the cylinder body, a crankshaft connecting rod is connected below the piston body, and closed bearings are arranged on two sides of the crankshaft connecting rod. Compared with the prior art, the lubricating device of the four-stroke engine achieves reasonable distribution of lubricating oil in a crank chamber, a cam chamber and a gas distribution chamber according to required concentration through arrangement and pressure adjustment of a lubricating oil path, and pressure gradients in the crank chamber, the engine oil distribution chamber, the cam chamber and the gas distribution chamber are subjected to orifice and oil way arrangement so as to realize directional movement of lubricating oil or oil mist and change of supply quantity according to different rotating speeds of the four-stroke engine, namely, the concentration of the lubricating oil required by the crank chamber, the engine oil distribution chamber, the cam chamber and the gas distribution chamber is sequentially reduced under the condition of meeting normal operation of the four-stroke engine.

Description

Lubricating device of four-stroke engine

Technical Field

The utility model relates to the technical field of engine lubrication, in particular to a lubrication device of a four-stroke engine.

Background

With the continuous development of society and the progress of science and technology, various garden tools and small agricultural institutions are also continuously transformed, updated and updated, the small engines are continuously improved in the aspects of gardens, agriculture and the like, two-stroke engines which can work in any direction are mainly used in the market at present, but with the increasingly serious environmental problems, the emission requirements are continuously improved, the two-stroke engines are inevitably replaced by the handheld four-stroke engines at the future time, the four-stroke engines are widely applied to garden tools, plant protection machines and small agricultural machines, such as handheld mowers (shears) and backpack type working machines, and the handheld four-stroke engines can have the following problems in the use process: firstly, when the engine works, to ensure that all operation parts such as a crankshaft connecting rod mechanism, a valve mechanism and the like are reliable in operation, and the operation mechanisms are required to be ensured to have sufficient engine oil to ensure lubrication, but in the existing lubrication system, the concentration of the lubricating oil in a crankshaft chamber, a valve chamber and a cam chamber is not adjusted, so that the lubrication is not ideal: secondly, in the working process of the engine in a larger posture, lubrication of all running parts is not well guaranteed, or engine oil is introduced into a combustion chamber along with air entering an air filter due to the fact that the setting position of the air filter is low, so that the phenomenon of burning the engine oil and carbon deposition in the combustion chamber is caused, and the working efficiency of the machine is affected. And thirdly, foreign matters generated in the process of installing or operating the four-stroke engine, such as mold closing glue, enter the main oil duct to block the oil duct, so that the lubricating oil supply quantity is reduced, poor lubrication of the engine is caused, the cylinder pulling phenomenon is seriously caused, the cylinder body is scrapped, and the maintenance cost is increased. Fourth, the oil-gas separation effect of the four-stroke engine is poor, so that the consumption of engine oil is overlarge, and the frequency of engine oil replacement and addition is increased. Fifthly, the pressure regulating performance in the crankcase is poor, the higher the rotating speed is, the larger the oil flow is, so that the concentration of the engine oil in the crankcase chamber, the cam chamber and the gas distribution chamber is too high, the engine oil consumption is increased, the engine oil degradation is fast, and the exhaust emission is high. And the through hole at the bottom of the engine oil distribution chamber at the lower part of the crankcase is opposite to the engine oil liquid surface, when the piston descends, the generated high-speed air flow blows to the engine oil liquid surface, so that the phenomena of liquid surface fluctuation, engine oil splashing and engine oil foaming in the engine oil chamber are caused, the phenomena of engine oil spreading in each chamber, engine oil oscillation and oil surface instability in the oil chamber are caused, and the problems of lubricating system faults and the like are caused, so that a lubricating device of a four-stroke engine is required.

The existing lubrication system generally utilizes the pressure change in the crank chamber to directly convey the concentration of the lubricating oil or oil mist in the crank chamber to the air distribution chamber and the air distribution device without adjusting, so that excessive lubricating oil or oil mist is conveyed into the air distribution chamber for lubricating the air distribution device, so that excessive lubricating oil amount deposited in the air distribution chamber is caused, and a large amount of lubricating oil is discharged while the blowby gas is discharged to the combustion chamber, thereby the problem of early exhaustion of the lubricating oil is caused. Therefore, the time required for replenishing the lubricating oil becomes short, and if the lubricating oil is not replenished in time, lubrication failure is caused. In addition, if the amount of lubricant discharged to the combustion chamber is further increased, the lubricant is discharged from the muffler to the outside in a large amount in an unburned state, and there is a possibility that the lubricant may adversely affect the environment.

Disclosure of Invention

The present utility model is directed to a lubrication device for a four-stroke engine, and aims to solve the problems that in the prior art, since the conventional lubrication system generally uses the pressure change in the crank chamber, the concentration of the lubricating oil or oil mist in the crank chamber is directly conveyed to the air distribution chamber and the air distribution device without being adjusted, and therefore, in order to lubricate the air distribution device, excessive lubricating oil or oil mist is conveyed to the air distribution chamber, so that the amount of lubricating oil deposited in the air distribution chamber is excessive, and a large amount of lubricating oil is discharged while blow-by gas is discharged to the combustion chamber, thereby leading to the problem of early exhaustion of the lubricating oil. Therefore, the time required for replenishing the lubricating oil becomes short, and if the lubricating oil is not replenished in time, lubrication failure is caused. In addition, if the amount of lubricant discharged to the combustion chamber is further increased, the lubricant is discharged from the muffler to the outside in a large amount in an unburned state, and there is a possibility that the lubricant may adversely affect the environment.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a lubrication device of a four-stroke engine, comprising:

the cylinder body is provided with a piston body at one side inside the cylinder body, a crankshaft connecting rod is connected below the piston body, two sides of the crankshaft connecting rod are provided with closed bearings, and a cam shaft gear is arranged at the other side inside the cylinder body;

the cylinder cover is arranged above the cylinder body, an air inlet valve and an air outlet valve are arranged below the cylinder cover, a first oil gas connecting pipe is arranged on one side of the air inlet valve and the air outlet valve, a second oil gas connecting pipe is arranged on one side of the first oil gas connecting pipe, a third oil gas connecting pipe is arranged below the second oil gas connecting pipe, and a fifth oil gas connecting pipe is arranged on one side, close to the piston body, of the cylinder body;

the rocker arm is arranged on one side outside the cam shaft gear, a cam cover is connected to the lower side of the cylinder body, a cylinder box body is arranged below the cam cover, an oil pan is arranged below the cylinder box body, a fourth oil-gas connecting pipe is arranged in the oil pan, and a filter screen is connected to the lower side of the fourth oil-gas connecting pipe;

the air filter is arranged above the cylinder body, one side below the air filter is connected with an oil return plate, and one side in the air filter is provided with a spark plug.

Preferably, the cylinder block is closed at one end by a cylinder head, and the piston body and the cylinder bore and the cylinder head together form a combustion chamber of a four-stroke engine.

Preferably, the piston body reciprocates in the cylinder body along the direction of the longitudinal axis of the cylinder body, and the piston body is rotationally connected with the crankshaft connecting rod.

Preferably, the closed bearings are symmetrically distributed about the vertical center line of the crankshaft connecting rod, and two closed bearings are arranged.

Preferably, the oil pan is further provided with:

the first oil hole, it sets up one side of oil pan below, one side of oil pan top is provided with the third oil hole, one side of piston body is provided with the second oil hole, the opposite side of piston body is provided with the fourth oil hole, one side of second oil hole is connected with first oil duct, and installs the check valve on the first oil duct.

Preferably, the first oil passage is further provided with:

the crank chamber is arranged on one side in the first oil duct, a third oil duct is arranged on one side below the crank chamber, a fourth oil duct is arranged below the third oil duct, a fifth oil duct is arranged above the fourth oil duct, a sixth oil duct is arranged above the fifth oil duct, and a seventh oil duct is arranged above the sixth oil duct.

Preferably, the piston body is further provided with:

the valve chamber is arranged above the piston body, a tenth oil duct is connected to the lower portion of the seventh oil duct, an eighth oil duct is connected to the lower portion of the tenth oil duct, a ninth oil duct is arranged on one side of the eighth oil duct, an oil-gas separation chamber is connected to one end of the tenth oil duct, and a cam chamber is arranged on one side in the eighth oil duct.

Compared with the prior art, the utility model provides a lubrication device of a four-stroke engine, which has the following beneficial effects:

the air filter is arranged at the position of the engine, which is not lower than the air distribution chamber, so that the engine is ensured to work in a larger posture, more engine oil is prevented from being introduced into the combustion chamber through the air filter, the phenomenon of burning engine oil and carbon deposition in the combustion chamber is avoided, meanwhile, the oil-gas separation device arranged at the bottom of the air filter is used for recovering separated engine oil to the crank chamber more easily under the action of gravity, the problem that the existing lubrication structure is high and compact due to the whole machine is avoided, the air filter is arranged below the air distribution chamber to reduce the sacrifice problem caused by the height dimension of the whole machine, the filter screen is specially arranged for condensing the oil-gas separation device, the effective separation of blow-by gas and engine oil is enhanced, the effective recovery and utilization of liquefied engine oil are realized, the reduced consumption of engine oil, the time of each chamber and the frequency of engine oil replacement and addition are solved, the problem that the existing four-stroke engine adopts an umbrella-shaped oil-gas separation device, the separation effect is lower than 50% of a silk screen condensation oil-gas separation device is solved, the problem that the existing lubrication system generally utilizes the pressure change in the crank chamber, the concentration of the lubricating oil in the room is not regulated and the concentration in the crank chamber is directly carried to the air distribution chamber or the air distribution chamber is discharged in advance, and the excessive oil is discharged to the air distribution chamber, and the excessive oil is exhausted in order to cause the excessive oil is discharged into the air distribution chamber. Therefore, the time required for replenishing the lubricating oil becomes short, and if the lubricating oil is not replenished in time, lubrication failure is caused. In addition, if the amount of lubricant discharged to the combustion chamber is further increased, the lubricant is discharged from the muffler to the outside in a large amount in an unburned state, and there is a possibility that the lubricant may adversely affect the environment.

Drawings

FIG. 1 is a schematic diagram of a front view of the present utility model;

FIG. 2 is a schematic diagram of an explosive structure according to the present utility model;

FIG. 3 is a schematic diagram of an exploded construction of the present utility model;

FIG. 4 is a schematic view of the internal structure of the present utility model;

FIG. 5 is a schematic view of a part of the structure of the lift oil-gas separation chamber of the present utility model.

In the figure: 1. a cylinder block; 2. a piston body; 3. a crankshaft connecting rod; 4. sealing the bearing; 5. a cam shaft gear; 6. a cylinder head cover; 7. an intake valve and an exhaust valve; 8. a first oil and gas connection pipe; 9. a second oil gas connection pipe; 10. a third oil gas connection pipe; 11. a rocker arm; 12. a cam cover; 13. a cylinder case; 14. a filter screen; 15. an oil pan; 16. a fourth oil gas connection pipe; 17. a fifth oil gas connection pipe; 18. an oil return plate; 19. an air filter; 20. a spark plug; 21. a first oil hole; 22. a second oil hole; 23. a third oil hole; 24. a fourth oil hole; 25. a first oil passage; 26. a one-way valve; 27. a crank chamber; 28. a third oil passage; 29. a fourth oil passage; 30. a fifth oil passage; 31. a sixth oil passage; 32. a seventh oil passage; 33. a valve chamber; 34. an eighth oil passage; 35. a ninth oil passage; 36. a tenth oil passage; 37. an oil-gas separation chamber; 38. a cam chamber.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-5, a lubrication device for a four-stroke engine, comprising: the cylinder body 1, one side of the inside of the cylinder body 1 is provided with a piston body 2, the lower part of the piston body 2 is connected with a crankshaft connecting rod 3, both sides of the crankshaft connecting rod 3 are provided with a sealed bearing 4, and the other side of the inside of the cylinder body 1 is provided with a cam shaft gear 5; the cylinder block 1 is closed at one end by a cylinder head, and the piston body 2 and the cylinder bore and the cylinder head together form a combustion chamber of a four-stroke engine; the piston body 2 reciprocates in the cylinder body 1 along the direction of the longitudinal axis of the cylinder body 1, and the piston body 2 is rotationally connected with the crankshaft connecting rod 3; the cylinder cover 6 is arranged above the cylinder body 1, the air inlet and outlet valve 7 is arranged below the cylinder cover 6, a first oil gas connecting pipe 8 is arranged on one side of the air inlet and outlet valve 7, a second oil gas connecting pipe 9 is arranged on one side of the first oil gas connecting pipe 8, a third oil gas connecting pipe 10 is arranged below the second oil gas connecting pipe 9, and a fifth oil gas connecting pipe 17 is arranged on one side, close to the piston body 2, of the cylinder body 1; a rocker arm 11 mounted on one side outside the cam shaft gear 5, a cam cap 12 connected to the lower side of the cylinder block 1, a cylinder box 13 mounted below the cam cap 12, an oil pan 15 mounted below the cylinder box 13, a fourth oil gas connecting pipe 16 mounted inside the oil pan 15, and a filter screen 14 connected to the lower side of the fourth oil gas connecting pipe 16; an air filter 19 mounted above the cylinder block 1, an oil return plate 18 connected to one side below the air filter 19, and a spark plug 20 mounted to one side inside the air filter 19; the closed bearings 4 are symmetrically distributed about the vertical center line of the crankshaft connecting rod 3, and two closed bearings 4 are arranged; through the arrangement of the lubricating oil paths and the pressure adjustment, the reasonable distribution of the lubricating oil of the crank chamber 27, the cam chamber 38 and the distribution chamber according to the required concentration is achieved, and the pressure gradients in the crank chamber 27, the engine oil distribution chamber, the cam chamber 38 and the distribution chamber are subjected to orifice and oil way adjustment so as to realize the directional movement of the lubricating oil or oil mist and the change of the supply quantity according to the different rotation speeds of the four-stroke engine, namely, the concentration of the lubricating oil required by the crank chamber 27, the engine oil distribution chamber, the cam chamber 38 and the distribution chamber is sequentially reduced under the condition of meeting the normal operation of the four-stroke engine; the air filter 19 is arranged at a position where the engine is not lower than the air distribution chamber, so that the engine is ensured to work in a larger posture, more engine oil is prevented from being introduced into the combustion chamber through the air filter 19, so that the phenomenon of burning engine oil and carbon deposition in the combustion chamber is avoided, meanwhile, the separated engine oil is more easily recovered to the crank chamber 27 by the oil-gas separation chamber 37 arranged at the bottom of the air filter 19 under the action of gravity, the problems of the existing lubrication structure due to the height and compactness of the whole machine are avoided, and the air filter 19 is particularly arranged below the air distribution chamber, so that the sacrifice problem caused by the height size of the whole machine is reduced.

Referring to fig. 2, 4 and 5, a lubrication device of a four-stroke engine includes: a first oil hole 21 provided at one side below the oil pan 15, a third oil hole 23 provided at one side above the oil pan 15, a second oil hole 22 provided at one side of the piston body 2, a fourth oil hole 24 provided at the other side of the piston body 2, a first oil passage 25 connected to one side of the second oil hole 22, and a check valve 26 mounted on the first oil passage 25; a crank chamber 27 installed at one side within the first oil passage 25, a third oil passage 28 installed at one side below the crank chamber 27, a fourth oil passage 29 installed below the third oil passage 28, a fifth oil passage 30 installed above the fourth oil passage 29, a sixth oil passage 31 installed above the fifth oil passage 30, and a seventh oil passage 32 installed above the sixth oil passage 31; a valve chamber 33 which is arranged above the piston body 2, a tenth oil duct 36 is connected below the seventh oil duct 32, an eighth oil duct 34 is connected below the tenth oil duct 36, a ninth oil duct 35 is arranged on one side of the eighth oil duct 34, an oil-gas separation chamber 37 is connected at one end of the tenth oil duct 36, and a cam chamber 38 is arranged on one side in the eighth oil duct 34; the adjustable performance of the internal pressure of the crankcase is realized by arranging the adjusting oil duct between the crank chamber 27 and the cam chamber 38, the linear increase of the higher engine oil flow rate of the rotating speed is avoided, the phenomenon that the engine oil consumption is increased, the engine oil degradation is faster and the exhaust emission is higher due to the overhigh engine oil concentration in the crankcase chamber, the cam chamber 38 and the air distribution chamber is avoided, the environment-friendly requirement is realized, meanwhile, the lubricating oil exchange between the cam chamber 38 and the crank chamber 27 is enhanced due to the arrangement of the adjusting oil duct, the lubricating and cooling effects of the cam chamber 38 are enhanced, and indirectly, the short circuit between the cam chamber 38 and the crank chamber 27 can be realized in the cold engine starting stage due to the arrangement of the adjusting oil duct, the quick entering of the lubricating oil in the cam chamber 38 is realized, and the internal pressure of the crank chamber 27 is adjusted due to the arrangement of the adjusting oil duct, and the engine oil quantity entering the crank chamber 27 through the main oil duct is correspondingly adjusted.

Working principle: in the use of the lubricating device of the four-stroke engine, firstly the cylinder block 1 has a cylindrical cylinder bore in which a reciprocating piston body 2 is supported, the cylinder block 1 being closed at one end by a cylinder head, the piston body 2 together with the cylinder bore and the cylinder head defining the combustion chamber of the four-stroke engine, the cylinder head being penetrated by a spark plug 20 which ignites the mixture in the combustion chamber, the piston being supported in the cylinder in a reciprocable manner in the direction of the longitudinal axis of the cylinder and driving a crankshaft rotatably supported in the crankshaft chamber 27 by means of a crankshaft connecting rod 3, wherein the crankshaft is rotatably supported in each case by bearings mounted at both ends of the crankcase, in particular by bearings close to the cam chamber 38 being closed bearings 4 for isolating communication between the crankshaft chamber 27 and the cam chamber 38, a timing gear fixed at the upper part of the crankshaft being in gear engagement with the camshaft gear 5 in a gear ratio of 1:2, the crankshaft timing gear and the camshaft gear 5 are integrally wrapped by the cam chamber 38, only a small number of oil passage holes are respectively connected with the crankshaft chamber 27, the engine oil chamber and the valve chamber 33, the directional operation of lubricating oil and the full lubrication of moving parts are ensured, the oil pan 15 is positioned at the bottommost part of the four-stroke engine, the engine oil chamber is jointly surrounded by the lower part of the crankshaft chamber 27 and the oil pan 15 for storing, recycling and cooling the lubricating oil, the engine oil distribution chamber is positioned between the engine oil chamber and the crankshaft chamber 27 and used for distributing the lubricating oil from the crankshaft chamber 27, one path of the engine oil is distributed to the engine oil chamber, the other path of the engine oil is distributed to the cam chamber 38, the lubricating oil distributed to the engine oil chamber is in a majority in a liquid phase state, namely the lubricating oil passing through the third oil hole 23 is basically in a liquid state, and the lubricating oil distributed to the cam chamber 38 is in a majority in a gas state, the oil baffle is arranged below the third oil hole 23 and used for reducing the kinetic energy impact of liquid lubricating oil passing through the third oil hole 23 on the oil surface, the cam chamber 38 is communicated with the valve chamber 33 through the fifth oil duct 30, the valve chamber 33 is arranged above the combustion chamber, a tappet rod not shown in the drawing is arranged in the fifth oil duct 30, the cam shaft gear 5 in the cam chamber 38 is driven by the crankshaft timing gear to do rotary motion, the cam drives the lower rocker arm 11 and drives the tappet rod to act on the upper rocker arm 11 to finally drive the valve to do up-and-down reciprocating motion, the valve in the combustion chamber is opened and closed, and the four-stroke motion of air intake, compression, acting and exhaust of the four-stroke engine is realized; the air filter 19 and the bottommost part of the air valve chamber 33 or the air valve chamber 33 is higher than the air valve chamber 33, so as to filter fine dust in the air, ensure fresh and clean air to enter the combustion chamber, and the oil-gas separation chamber 37 is integrated on the air filter 19, effectively separates blow-by gas from gas-phase lubricating oil, generates liquid lubricating oil at the bottom and returns the liquid lubricating oil to the engine oil chamber for recycling, and residual blow-by gas and a small amount of lubricating oil which is not separated are introduced into the combustion chamber for full combustion, so that adverse effects on the environment caused by direct discharge of the blow-by gas into the air are reduced; when the piston body 2 moves up to the vicinity of the top dead center, the internal volume of the crank chamber 27 becomes larger, the pressure in the crank chamber 27 becomes smaller, the crank chamber 27 forms a negative pressure state, the second oil hole 22 and the fourth oil hole 24 arranged at the two sides of the cylinder body 1 are simultaneously opened, under the action of the negative pressure of the crank chamber 27, the lubricating oil stored in the oil pan 15 enters the first oil duct 25 through the oil suction port arranged at the lowest end of the oil pan 15, so that the crank connecting rod 3 and the piston body 2 and the like in the crank chamber 27 are lubricated, namely, the lubricating oil firstly passes through the filter screen 14, impurities in the lubricating oil are filtered, the lubricating oil enters the first oil duct 25 through the first oil hole 21, the check valve 26 is opened under the action of the negative pressure in the crank chamber 27, and the liquid-phase lubricating oil enters the crank chamber 27 through the second oil hole 22 arranged on the cylinder body 1 after passing through the check valve 26; the crankshaft connecting rod 3 and the piston body 2 which run at high speed break up lubricating oil into oil mist and oil drops with different diameters, the oil mist is diffused in the crankshaft chamber 27, an oil film is generated between each moving part, each friction pair is effectively lubricated, and normal running of the engine is guaranteed, at the moment, the lubricating oil attached to the inner wall of the crankshaft chamber 27 gathers towards the bottom of the crankshaft chamber 27 under the action of gravity due to condensation effect and oil drop centrifugal effect, the one-way valve 26 is in a closed state, the ninth oil duct 35 is a channel with smaller diameter under the negative pressure effect of the crankshaft chamber 27, the throttling effect is obvious, so that a small amount of oil mist existing in the cam chamber 38 enters the crankshaft chamber 27, the pressure in the crankshaft chamber 27 is obviously regulated, and the lubricating oil quantity passing through each oil duct is controlled, and particularly, the flow of the lubricating oil in the first oil duct 25 is obviously and effectively controlled; meanwhile, under the negative pressure of the crank chamber 27, the fourth oil hole 24 exclusively transfers the pressure in the crank chamber 27 to the tenth oil passage 36, and then the sixth oil passage 31, the seventh oil passage 32 and the eighth oil passage 34 are respectively connected through a three-way pipe, namely, the mixture of blowby gas and lubrication oil mist in the sixth oil passage 31 at the topmost end of the valve chamber 33 is thoroughly separated into liquid-phase lubrication oil and blowby gas through an oil-gas separation chamber 37 arranged in the air filter 19, wherein the blowby gas is introduced into the combustion chamber for combustion so as to reduce environmental pollution, the separated liquid-phase lubrication oil enters the tenth oil passage 36 through a one-way valve 26 opened under the negative pressure, the seventh oil passage 32 arranged in the middle of the valve chamber 33 also introduces part of larger-particle lubrication oil drops into the tenth oil passage 36 under the negative pressure, the one-way valve 26 arranged in the eighth oil passage 34 has larger opening pressure, the oil mist is mainly used as regulating pressure, namely, only a small amount of lubricating oil mist existing at the upper part of an engine oil chamber is introduced into a tenth oil duct 36 under the action of negative pressure, and finally lubricating oil enters a crank chamber 27 through a fourth oil hole 24, so that the lubricating oil is recycled, when a piston descends to the vicinity of a bottom dead center, the internal volume of the crank chamber 27 is reduced, the pressure in the crank chamber 27 is increased, the crank chamber 27 forms a positive pressure state, at the moment, the second oil hole 22 and the fourth oil hole 24 are in a closed state, under the action of the pressure of the crank chamber 27, a one-way valve 26 is opened, liquid-phase lubricating oil accumulated at the bottom of the crank chamber 27 firstly enters an engine oil distribution chamber, the liquid-phase lubricating oil accumulated at the bottom of the crank chamber 27 is rapidly reduced, after the liquid-phase lubricating oil accumulated at the bottom of the crank chamber 27 is discharged, part of blow-by gas and oil mist in the crank chamber 27 is then pushed into the engine oil distribution chamber, the ninth oil passage 35 is effective in lubricating the internal moving parts by a small amount of lubricating oil in the crank chamber 27 entering the cam chamber 38 through the ninth oil passage 35 due to the throttling effect thereof, and then the lubricating oil entering the oil distribution chamber travels in two routes, wherein one route enters the oil chamber through the third oil hole 23 at the bottom of the oil distribution chamber, the lubricating oil passing through the third oil hole 23 is in a liquid phase state at a large amount, under the dual effects of gravity and the pressure of the crank chamber 27, the fluid passing through the third oil hole 23 has larger kinetic energy, the upper part of the oil chamber is provided with the fourth oil passage 29 communicated with the bottommost part of the cam chamber 38, and is generally provided with an orifice with the diameter of 1.5-2.5mm, and the functions are as follows: the oil mist stored in the upper part of the engine oil chamber is conveyed to the cam chamber 38, lubricating oil stored in the cam chamber 38 is returned to the engine oil chamber, the other lubricating oil path is a third oil path 28 for communicating the engine oil distribution chamber and the cam chamber 38, the third oil path 28 is opened at the highest point of the engine oil distribution chamber, so that a relatively light gas mixture of lubricating oil mist and blowby gas in the engine oil distribution chamber enters a relative motion part in the cam chamber 38 through the third oil path 28, the lubricating oil mist is input into the cam chamber 38 through the third oil path 28, the fourth oil path 29 and the ninth oil path 35 respectively, the cam chamber 38 is under the pressure action of the crank chamber 27, the lubricating oil in the cam chamber 38 is led into an air distribution chamber through the fifth oil path 30, the motion part arranged in the air distribution chamber is lubricated, at the moment, the lubricating oil concentration in the air distribution chamber is recovered to the engine oil chamber through the fourth oil path 29 after being liquefied by part of the expansion of the cam chamber 38 and the centrifugal action of the rotary part, the lubricating oil in the air distribution chamber is recovered, and the lubricating oil in the air distribution chamber is completed, the lubricating oil in the air distribution chamber is finished, and the engine oil chamber is circulated through the seventh oil path 31, the fourth oil path 32, the oil path and the oil mist and the cylinder gas in the air distribution chamber is distributed in the engine oil chamber is distributed under the same volume as the pressure condition as the engine oil chamber, and the engine oil concentration is realized.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A lubrication device of a four-stroke engine, comprising:

the novel engine comprises an engine cylinder body (1), wherein a piston body (2) is arranged on one side of the inside of the engine cylinder body (1), a crankshaft connecting rod (3) is connected below the piston body (2), sealing bearings (4) are arranged on two sides of the crankshaft connecting rod (3), and a cam gear (5) is arranged on the other side of the inside of the engine cylinder body (1);

the cylinder cover (6) is arranged above the cylinder body (1), an air inlet and outlet valve (7) is arranged below the cylinder cover (6), a first oil gas connecting pipe (8) is arranged on one side of the air inlet and outlet valve (7), a second oil gas connecting pipe (9) is arranged on one side of the first oil gas connecting pipe (8), a third oil gas connecting pipe (10) is arranged below the second oil gas connecting pipe (9), and a fifth oil gas connecting pipe (17) is arranged on one side, close to the piston body (2), of the cylinder body (1);

the rocker arm (11) is arranged on one side outside the cam shaft gear (5), a cam cover (12) is connected to the lower side of the cylinder body (1), a cylinder box (13) is arranged below the cam cover (12), an oil pan (15) is arranged below the cylinder box (13), a fourth oil-gas connecting pipe (16) is arranged inside the oil pan (15), and a filter screen (14) is connected to the lower side of the fourth oil-gas connecting pipe (16);

the air filter (19) is arranged above the cylinder body (1), one side below the air filter (19) is connected with an oil return plate (18), and one side in the air filter (19) is provided with a spark plug (20).

2. A lubrication device of a four-stroke engine according to claim 1, characterized in that the cylinder block (1) is closed at one end by a cylinder head, and that the piston body (2) together with the cylinder bore and the cylinder head constitutes the combustion chamber of the four-stroke engine.

3. A lubrication device of a four-stroke engine according to claim 1, characterized in that the piston body (2) is reciprocally movable in the cylinder block (1) in the direction of the longitudinal axis of the cylinder block (1), and that the piston body (2) is in rotational connection with the crankshaft connecting rod (3).

4. A lubrication device of a four-stroke engine according to claim 1, characterized in that the closed bearings (4) are symmetrically distributed about the vertical centre line of the crankshaft connecting rod (3), and that the closed bearings (4) are provided in two.

5. A lubrication device of a four-stroke engine according to claim 1, characterized in that the oil pan (15) is further provided with:

the oil pan comprises an oil pan body (15), a first oil hole (21) arranged on one side below the oil pan body (15), a third oil hole (23) arranged on one side above the oil pan body (15), a second oil hole (22) arranged on one side of the piston body (2), a fourth oil hole (24) arranged on the other side of the piston body (2), a first oil duct (25) connected to one side of the second oil hole (22) and a one-way valve (26) arranged on the first oil duct (25).

6. A lubrication device of a four-stroke engine according to claim 5, characterized in that the first oil passage (25) is further provided with:

the crank chamber (27) is arranged on one side in the first oil duct (25), a third oil duct (28) is arranged on one side below the crank chamber (27), a fourth oil duct (29) is arranged below the third oil duct (28), a fifth oil duct (30) is arranged above the fourth oil duct (29), a sixth oil duct (31) is arranged above the fifth oil duct (30), and a seventh oil duct (32) is arranged above the sixth oil duct (31).

7. A lubrication device of a four-stroke engine according to claim 6, characterized in that the piston body (2) is further provided with:

valve chamber (33), it sets up the top of piston body (2), the below of seventh oil duct (32) is connected with tenth oil duct (36), and the below of tenth oil duct (36) is connected with eighth oil duct (34), one side of eighth oil duct (34) is provided with ninth oil duct (35), the one end of tenth oil duct (36) is connected with oil gas separation chamber (37), one side in eighth oil duct (34) is equipped with cam chamber (38).

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