WO2008092295A1

WO2008092295A1 - A lubricating system for a free rotation small-size four-stroke gasoline engine

Info

Publication number: WO2008092295A1
Application number: PCT/CN2007/000248
Authority: WO
Inventors: Hongfeng Li; Dingchang Wu; Chen-Hsiung Chang
Original assignee: Hongfeng Li; Dingchang Wu; Chen-Hsiung Chang
Priority date: 2007-01-23
Filing date: 2007-01-23
Publication date: 2008-08-07

Abstract

A lubricating system for a free rotation small-size four-stroke gasoline engine is provided in the application, it includes a crankcase(31), a crankshaft(32), a one-way valve(33) for introducing gas, a one-way valve(34) for exhausting gas, and an oil separator(35). The crankshaft(32) is mounted to the crankcase(31) by the bearings(36), a chamber(38) surrounding the crankshaft is provided at an end of the crankshaft(32), a channel(39) is provided in the crankshaft, one end of the channel(39) is communicated with the chamber(38), the other end of the channel is communicated with the crankcase, the oil separator(35) is communicated with a valvechamber(310) by the one-way valve(33) for introducing gas and is communicated with the chamber(38) surrounding the crankshaft by the one-way valve(34) for exhausting gas and finally is communicated with the crankcase, there is an air outlet(311) in the oil separator(35).

Description

Free-rotating small universal four-stroke gasoline engine lubrication system

The invention belongs to a gasoline engine lubrication system, in particular to a free-rotating small universal four-stroke gasoline engine lubrication system. Background technique

At present, the application fields of small general-purpose gasoline engines at home and abroad are becoming more and more extensive. In many occasions, such as: chain saws, shearers, military generators, etc., the engine is required to operate normally in any direction within 360°. However, the existing small general-purpose gasoline engine has problems in that it fails to effectively solve the lubrication problem in the 360° range, and the oil enters the combustion chamber during the inversion to cause the flameout, and the repeated starting is difficult. There are two types of lubrication systems for a typical small-scale gasoline engine that can work normally in the 360° range: one is the lubrication system disclosed in Japanese Patent, and the main structure of the lubrication system includes the lubricating oil chamber 4, the oil pan 2, and the oil supply. The passage 3, the crankcase chamber 6, the reed valve 7, the gear chamber 8, the valve chamber 9, the oil return passage 1, and the oil return pipe 5 (see Fig. 1 for the structure). During engine operation, the oil pan mounted on the crankshaft stirs up the lubricating oil in the lubricating oil chamber to generate oil mist. When the piston is ascending, the reed valve at the bottom of the crankcase is closed, and the pressure in the crankcase chamber is reduced to less than lubrication. The pressure in the oil chamber, that is, < 3⁄4, under the pressure difference, the oil mist of the lubricating oil chamber is sucked into the crankcase chamber through the oil supply hole passage on the crankshaft; when the piston descends, the pressure of the crankcase rises, that is, 〉 _s The reed valve is opened, the lubricating oil mist passes through the gear chamber and reaches the valve chamber. During the process of lubricating oil mist from the crank chamber to the valve chamber, the connecting rod, the bearing, the piston, the main bearing, the gear, the camshaft, the valve, and the like are lubricated. Rocker arm and other parts. The lubricating oil process is: lubricating oil chamber → oil pan → oil supply channel → crank chamber → connecting rod crank piston → reed valve → gear chamber → gear, camshaft → valve chamber → valve rocker arm → oil return passage → Return oil pipe → lubricating oil room.

The other is a patented lubrication system designed by the Tianjin Internal Combustion Engine Research Institute of China, which includes a lubricating oil chamber 27, an eccentric mechanism 26, a lubricating oil pump 24, a fuel supply passage 25, a crankcase chamber 29, a gear chamber ² 11, and a valve chamber. ² 12, oil mist circulation channel 22, circulating oil pipe 28 and two check valves, upper check valve 23 and lower check valve 210, and oil return passage 21 (the structure is shown in Fig. 2); The driving lubrication of the eccentric mechanism on the crankshaft pumps the lubricating oil through the oil supply passage in the crankcase, and sprays it onto the gear of the crankcase chamber and the gear chamber, forming an oil mist under the impact of the gear; When the check valve at the lower end of the lubricating oil mist circulation passage is closed, the pressure of the crank chamber is lowered to be lower than the pressure of the lubricating oil chamber, that is, 3⁄4 < 3⁄4, under the action of the difference, the upper end of the lubricating oil mist circulation passage The check valve is opened, and the lubricating oil and oil mist accumulated in the lubricating oil mist circulation passage are flowed back. To the lubrication chamber; when the piston descends, the check valve at the upper end of the lubricating oil mist circulation passage is closed, and the pressure in the crank chamber is raised to be greater than the pressure in the lubricating oil chamber, that is, the lubricating oil mist is opened, and the lubricating oil mist is circulated. The check valve at the lower end of the passage passes through the gear chamber to the valve chamber. During the process of lubricating oil mist from the crank chamber to the valve chamber, the connecting rod, the crankshaft, the piston, the gear, the camshaft, the valve, the rocker arm and the like are lubricated; After the lubricating oil mist reaches the valve chamber, a large part of it flows back to the lubricating oil chamber through the lubricating oil mist circulation passage, and a small portion is separated by the oil and gas, collects into the oil return passage of the cylinder head cover, and flows back to the crank chamber through gravity. The oil mist circulation passage flows back to the lubricating oil chamber through the oil mist circulation passage. The lubrication process is: lubricating oil chamber → eccentric mechanism → lubricating oil pump → oil supply passage → crank chamber chamber “link crankshaft piston → lower end one-way wide → gear chamber → gear camshaft – valve chamber – valve rocker arm → oil mist cycle aisle.

The disadvantages of the lubrication system disclosed in this patent are: complex structure, high cost, low reliability, and easy to flow into the combustion chamber in the crank chamber; the shortage of the lubrication system disclosed in the Chinese patent is: Tianjin Internal Combustion Engine Research Institute only Adding some components to Japan makes the structure more complicated. Summary of the invention

The object of the present invention is to provide a free-rotating small-sized universal four-stroke gasoline engine lubrication system with a single structure, low cost, and reliable operation in view of the deficiencies of the prior art.

The free-rotating small universal four-stroke gasoline engine lubricating system of the present invention is characterized in that it comprises a crankcase, a crankshaft, an intake check valve, an air outlet check valve and an oil and gas separation chamber; the crankshaft is mounted on the crankcase through a bearing, A cavity surrounding the crankshaft is disposed at one end of the crankshaft, and a crankshaft vent hole is disposed on the crankshaft at the end, the crank vent hole has one end communicating with the cavity member and the other end communicating with the crank chamber; and the best way is the crankshaft vent hole The axis of the crankshaft extends to the rear of the crank and bends from the side outlet of the crank to communicate with the crank chamber; the oil and gas separation chamber communicates with the valve chamber through the intake check valve, through the one-way outlet, the valve and the cavity at one end of the crankshaft and finally The crank chamber is connected, and the oil and gas separation chamber is further provided with an air outlet communicating with the air.

The working principle of the invention is: using the piston to descend, causing pressure in the crankcase to cause the lubricating oil in the crankcase to splash, and the splashed lubricating oil is broken under the movement of the crankshaft and the gear mechanism, 'When the piston descends again The generated pressure causes the broken lubricating oil to be rapidly atomized, and then the atomized lubricating oil is lubricated to various parts of the body to achieve the purpose of atomizing the lubricating oil and lubricating the relevant parts of the engine.

Under the working condition of the engine, when the piston descends, when the pressure in the crankcase rises to the pressure at the outlet check valve, the outlet check valve opens, and the crank chamber quickly passes through the air outlet of the crankshaft. At this time, the oil and gas brought out enters the oil separation chamber, and the air is discharged from the air outlet on the oil separation chamber, and the oil is retained in the oil separation chamber. At this time, the intake check valve is in the closed state, and the oil is opened and returned when the piston is up. The lubrication process is as follows: initial piston down, crankcase Ρ ΐ—lubricating oil splashing crankshaft and mechanism operation→broken lubricating oil→piston down again, crankcase Ρ 润滑油 lubricating oil quickly atomizing the suction port to return oil.

Among them, the working principle of the intake check valve is: It can only take in one-way air from the oil separation chamber to the valve chamber. When the piston is ascending, a negative pressure is formed in the crankcase, and the intake check valve opens and enters fresh air. The lubricating oil remaining in the oil separation chamber is sucked into the engine (crankcase) by the negative pressure action, thereby reducing the oil consumption rate. The working principle of the air outlet check valve is: It can only ventilate from the crank chamber to the oil and gas separation chamber through the crankshaft air outlet in one direction. At the initial stage of the piston, since it is in the closed state, it can rapidly increase the crankcase pressure and make the lubrication The oil splashes and atomizes; but when it enters the normal working state, that is, when the pressure in the crank chamber reaches a certain pressure, the outlet check valve opens, and the oil in the crank chamber enters the oil separation chamber from the crankshaft outlet, thereby reducing the pressure in the crankcase. In order to avoid losing power. The inlet and outlet check valves adopt a spherical check valve, which can greatly improve the work reliability, improve the sensitivity and reduce the cost.

The crankshaft vent is mainly used for ventilation. When the engine is not working, it is in a static state. Regardless of the position of the engine (such as inversion), since the outlet check valve is not open, the lubricating oil in the crankcase does not flow to the oil and gas. In the chamber; when the engine is working, since the crankshaft air outlet is designed around the crank, during the rotation of the crankshaft, the lubricating oil does not enter the oil separation chamber due to the centrifugal force.

Compared with the prior art, the invention has the significant advantages of adopting a new design principle, a single process, a small number of components, low cost and high reliability; the lubricating oil never enters the oil separation chamber, and is turned over at 360 ° After continuous operation for more than 2 hours, there is no flameout and no smoke, and the effect is obvious.

In summary, the present invention has many advantages and practical values as described above, and has great advances in technology, has practical and simple effects, and has leapfrogging progress over existing stereo camera equipment and methods thereof. A viable, reliable, leading new design.

The above description is only an overview of the technical solutions of the present invention, and the technical means of the present invention can be more clearly understood, and can be implemented in accordance with the contents of the specification, and the above and other objects, features and advantages of the present invention can be made more obvious. It is to be understood that the preferred embodiments are described below in detail with reference to the accompanying drawings. DRAWINGS

Fig. 1 is a schematic view showing the structure disclosed in Japanese Patent Laid-Open Publication No. Hei. Fig. 2 is a schematic view showing the structure disclosed in the prior art of the Chinese patent.

3 is a schematic structural view of an embodiment of the present invention.

1 oil return channel 2: oil pan,

3 oil supply channel 4: lubricating oil room,

5 return pipe 6: crankcase room,

7 reed valve 8 : gear chamber,

9 valve chamber 21 oil return passage,

22 Oil mist circulation channel 23 The upper end is unidirectional,

24 Lubricating oil pump 25 oil supply passage,

26 eccentric mechanism 27 lubricating oil room,

28 circulation channel 29 crankcase room,

210: lower check valve 211: gear chamber,

212 valve chamber 31 including crankcase

32 crankshaft 33 intake check valve

34 Outlet check valve 35 Oil and gas separation chamber.

36 bearing 37 oil seal

38 cavity 39. Ventilation 孑 L>

310: Valve chamber 311: Air outlet Specific implementation

3 is a schematic structural view of a specific embodiment of the present invention. The present invention is designed as a free-rotating small-sized general-purpose four-stroke gasoline engine lubrication system including a crankcase 31, a crankshaft 32, an intake check valve 33, an exhaust check valve 34, and an oil and gas separation chamber 35. The crankshaft 32 is mounted on the crankcase 31 via a bearing 36. A cavity 38 surrounding the crankshaft is provided at one end of the crankshaft 32, and a crankshaft vent 39 is provided on the crankshaft, and one end of the crankshaft vent 39 and the cavity 38 are provided. The oil and gas separation chamber 35 communicates with the valve chamber 310 through the intake check valve 33, and communicates with the cavity 38 at one end of the crankshaft through the air outlet check valve 34, and the oil and gas separation chamber 35 is further provided. An air outlet 311 communicating with the air.

The crankcase 31 and the crankshaft 32 described above are substantially the same as the prior art, and both ends of the crankshaft 32 are mounted on the crankcase 31 via bearings 36. In the crankcase 31, that is, a piston in the crank chamber is connected to the crankshaft via a connecting rod, in the piston Under the driving, the crankshaft rotates, above the piston, that is, below the valve chamber 310 is the combustion chamber of the engine. In the left crankcase, there are two oil seals 37 around the crankshaft, and between the two oil seals is an annular cavity 38, which is a bridge connecting the crank chamber and the oil and gas separation chamber. In In the crankshaft on one side of the cavity, there is a through hole along the axis, the left side of the through hole is curved in the radial direction to connect the through hole with the cavity, and the right side is bent from the center of the crank to the side of the crank to make the through hole and the crank chamber In connection, the three-section through hole constitutes a crankshaft air outlet 39. The crankshaft vent 39 extends along the axis of the crankshaft to the rear of the crank and is coupled to the crank chamber from the side outlet of the crank. The oil and gas separation chamber 35 located on the upper left side of the crankcase communicates with the valve chamber 310 of the engine through the intake check valve 33, and communicates with the chamber between the two oil seals via the outlet check valve 34. The intake check valve 33 can only be inducted into the valve chamber, and the outlet check valve 34 can only output air to the oil separation chamber. At the same time, the inlet and outlet check valves preferably adopt a spherical check valve. An air outlet 311 to the air is also provided on the oil and gas separation chamber. The above-described intake check valve 33 and outlet check valve 34 employ a spherical check valve.

The free-rotating small-sized universal four-stroke gasoline engine lubrication system of the present invention uses the piston to descend to generate pressure in the crankcase, and causes the lubricating oil in the crankcase to splash. The splashed lubricating oil is broken under the movement of the crankshaft and the gear mechanism. When the piston descends again, the pressure generated causes the broken lubricating oil to rapidly atomize, and then the atomized lubricating oil is lubricated to various parts of the body, thereby achieving the purpose of atomizing the lubricating oil and lubricating the relevant parts of the engine. .

Under engine operating conditions, when the piston descends, when the pressure in the crankcase rises to > 4 (pressure at the outlet check valve), the outlet check valve opens, and the crank chamber quickly exits through the air outlet of the crankshaft. The oil and gas enters the oil separation chamber, and the air is discharged from the gas outlet on the oil separation chamber, and the oil is retained in the oil separation chamber. At this time, the intake check valve is closed, and it is opened and oiled when the piston is up. The lubrication process is: initial piston down, crankcase P t - lubricant splash - crankshaft and mechanism operation → broken lubricant → piston goes down again, crankcase oil atomized quickly → suction port returns oil. .

Among them, the intake check valve can only enter the air chamber from the oil separation chamber to the valve chamber. When the piston is ascending, a negative pressure is formed in the crankcase, and the intake check valve is opened to incorporate fresh air, and the negative pressure is utilized. The oil remaining in the oil separation chamber is sucked into the engine (crankcase), thereby reducing the oil consumption rate. The working principle of the air outlet check valve is: It can only ventilate from the crank chamber to the oil and gas separation chamber through the crankshaft air outlet in one direction. At the initial stage of the piston, since it is in the closed state, it can rapidly increase the crankcase pressure and make the lubrication The oil splashes and atomizes; but when it enters the normal working state, that is, when the pressure in the crank chamber reaches a certain pressure, the outlet check valve opens, and the oil in the crank chamber enters the oil separation chamber from the crankshaft outlet, thereby reducing the pressure in the crankcase. In order to avoid losing power. The inlet and outlet single-way valves adopt a spherical one-way valve, which can greatly improve the work reliability, improve the sensitivity and reduce the cost.

The crankshaft vent is mainly used for ventilation. When the engine is not working, it is in a static state. Regardless of the position of the engine (such as inversion), since the outlet check valve is not open, the lubricating oil in the crankcase does not flow to the oil and gas. In the room; when the engine is working, because the crankshaft vent is designed Around the crank, during the rotation of the crankshaft, the lubricating oil does not enter the oil separation chamber due to the centrifugal force. Industrial applicability

The free-rotating small-sized general-purpose four-stroke gasoline engine lubricating system of the present invention, when the engine is not in operation, is in a static state, regardless of the position of the engine (such as inversion), since the outlet check valve is not opened, the lubricating oil in the crankcase It does not flow into the oil and gas separation chamber; when the engine is working, since the crankshaft air outlet is designed around the crank, during the rotation of the crankshaft, the lubricating oil does not enter the oil separation chamber due to the centrifugal force. The invention adopts a completely new design principle, has simple process, few parts, low cost and high reliability; the lubricating oil never enters the oil and gas separation chamber, and does not extinguish fire or smoke when continuously operated for more than 2 hours at 360° turning. The effect is remarkable.

Claims

Claim

1, a free universal rotary small four-stroke gasoline engine lubrication system, characterized in that: it comprises a crankcase (31), a crankshaft (32), the inlet check valve (33), the outlet check valve ⁽³⁴⁾ and The oil and gas separation chamber (35); the crankshaft (32) is mounted on the crankcase (31) through a bearing (36), and a cavity (38) surrounding the crankshaft is provided at one end of the crankshaft (32), and the crankshaft is disposed on the crankshaft (32) There is a crankshaft vent (39), one end of the crankshaft vent (39) communicates with the cavity (38), and the other end communicates with the crankcase chamber; the oil separation chamber (35) passes through the intake check valve (33) and the valve The chamber (310) communicates with the chamber (38) at one end of the crankshaft through an outlet check valve (34), and the gas separation chamber (35) is further provided with an air outlet (311) communicating with the air.

2. The free-rotating small-sized universal four-stroke gasoline engine lubrication system according to claim 1, wherein: the crankshaft vent (9) extends along the axis of the crankshaft to the crank and is bent backward, and exits from the side of the crank and the crank chamber. The same.

A free-rotating small-sized general-purpose four-stroke gasoline engine lubricating system according to claim 1 or 1, wherein: the intake check valve (3) and the outlet check valve (4) employ a spherical check valve.