Lubrication system of handheld air-cooled four-stroke gasoline engine and gasoline engine

A lubricating system and gasoline engine technology, applied in the direction of engine lubrication, pressure lubricant, machine/engine, etc., can solve the problems of increasing the manufacturing cost of the whole machine, losing the function of the oil-gas separation mechanism, and affecting the performance of the gasoline engine, so as to ensure stability, Lubricating oil forms the effect of reliable circulation separation and simple structure

Pending Publication Date: 2019-05-24

SHANDONG HUASHENG PESTICIDE APPL MACHINERY CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

Although it can lubricate the components in the gasoline engine, it uses a reed-type check valve to achieve one purpose, which increases the difficulty of manufacturing the whole machine and increases the manufacturing cost of the whole machine

In addition, it uses the to...

Abstract

The invention relates to a lubrication system of a handheld air-cooled four-stroke gasoline engine and a gasoline engine. The lubrication system comprises a cylinder block, a crankshaft connecting rodgroup, a piston, a crankcase formed by a front box body and a rear box body and a cylinder cover; the lubrication system furhter comprises a crankshaft chamber and an oil storage chamber which communicate with each other, an oil feeding channel and an oil returning channel which form a circulation and are provided with a one-way valve; through the change of pressure in a rotary crank chamber of the crankshaft, lubricating oil mist lubricates all parts in a valve chamber, a tappet chamber, a cam chamber and the crank chamber. a first-stage oil-gas separation channel and a second-stage exhaustchannel are arranged to discharge the burnt waste gas which enters the crank chamber from the gap between the piston and the cylinder body out of the crankcase; The scheme provided by the invention has the beneficial effects of smooth circulation of lubricating oil, reliable separation of the oil-gas separation device, effective control of waste gas timing, unidirectional discharge, stable operation of products at any angle, etc.

Application Domain

Machines/enginesPressure lubrication +1

Technology Topic

LubricationReturn channel +9

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Examples

Experimental program(1)

Example Embodiment

[0040] like Figure 1 to Figure 7As shown in the figure, a hand-held air-cooled four-stroke gasoline engine lubrication system is divided into a crankcase chamber, which is divided into a crank chamber 2 and an oil storage chamber 1 that communicate with each other, a first-stage oil and gas separation channel 11 (including a crankshaft connecting rod group 21, a rear half crankshaft 10. Intake hole 8, oil and gas separation channel 12 and air outlet hole 13), secondary exhaust channel 32 (including oil and gas separation channel 12, air outlet hole 13, and exhaust hole 28), upper oil channel 3 (including the front half of the crankcase 23. Cylinder block 15, oil check valve 4, oil check valve seat 6, squeeze hole 5), oil return passage (including valve chamber 17, tappet chamber 18, cam assembly 19, oil return passage 22, return It consists of oil check valve 24 and oil return check valve seat 25).

[0041] The rear half crankcase 9 is provided with a lubricating oil passage 14 , which communicates with the oil storage chamber 1 to form a lubricating oil passage surrounding the periphery of the crank chamber 2 , and the oil storage chamber 1 contains lubricating oil 26 .

[0042] The crankcase 31 including the crank chamber 2 and the oil storage chamber 1 communicated with each other is composed of the front half crankcase 23 and the rear half crankcase 9, and the crankshaft connecting rod group 21 with the oil dial 27 installed at the big end of the connecting rod is installed in the crankcase 31. The crankshaft chamber 2 is connected to the piston assembly 16. The crankshaft connecting rod assembly 21 rotates to drive the piston assembly 16 to reciprocate in the cylinder block 15. At the same time, the oil dial 27 dials the lubricating oil 26 from liquid to gas.

[0043] The first-stage oil-gas separation channel 11 includes an air intake hole 8 that is located in the crank and is open to one side of the crank, an oil-gas separation channel 12 that is arranged along the axis of the rear half crankshaft 10, and an outlet that is located in the shaft diameter and is arranged perpendicular to the axis. Air hole 13.

[0044] The top of the cylinder block 15 and the cylinder cover 7 form a valve chamber 17 with a built-in rocker valve assembly 29;

[0045] The tappet chamber 18 is formed by the cylinder body wall, and the tappet assembly 30 is placed in the tappet chamber 18;

[0046] The cam chamber 20 is composed of the cylinder block 15 and the front half crankcase 23, and the cam assembly 19 is placed in the cam chamber 20; the valve chamber 17, the tappet chamber 18, and the cam chamber 20 are communicated.

[0047] The front half crankcase 23 is provided with an oil return passage 22, and an oil return check valve 24 is installed on the oil return check valve seat 25 and placed in the oil return passage 22, and communicates with the valve chamber 17 and the tappet chamber 18 through the oil return passage 22. , cam chamber 20, crank chamber 2 and oil storage chamber 1, form the oil return passage.

[0048] An oil channel 3 is formed on the inner wall of the front half crankcase 23 and the cylinder block 15. The oil check valve 4 is installed on the oil check valve seat 6 and placed in the oil channel 3, and the oil check valve seat 6 is located in the oil channel 3. On one side of the valve chamber 17 , the squeeze hole 5 provided on the oil-filling check valve seat 6 communicates with the valve chamber 17 and the oil-filling passage 3 .

[0049] The inner wall of the rear half crankcase 9 is provided with an exhaust hole 28. When the crankshaft rotates to the angle of 156 0 0 When the crankshaft angle is not within this range, the exhaust hole 28 is not communicated with the air outlet 13, and the exhaust gas is not discharged. Outside air also cannot reach the crankcase 31 .

[0050] The oil storage chamber 1 communicates with the valve chamber 17 through two channels:

[0051] ①Oil storage chamber 1 → oil passage 3 → oil check valve 4 → squeeze hole 5 → valve chamber 17;

[0052] ②Valve chamber 17 → tappet chamber 18 → cam chamber 20 → oil return passage 22 → oil return check valve 22 → oil storage chamber 1.

[0053] The specific working process is as follows: through the rotation of the crankshaft, the oil dial at the big end of the connecting rod stirs the lubricating oil in the oil storage chamber to generate oil mist, and the oil mist spreads throughout the crankshaft chamber. At this point, the piston assembly and crankshaft connecting rod group are lubricated. In the downward stroke of the piston assembly, as the pressure in the crank chamber increases, under the action of the pressure, the oiling check valve opens, and the lubricating oil mist passes through the oiling passage → the oiling check valve → the squeeze hole reaches the valve chamber , Lubricate the parts in the valve chamber. During the upward process of the piston, negative pressure is generated in the crankshaft chamber, the oil return check valve opens, and the lubricating oil mist and liquid lubricating oil pass through the valve chamber → tappet chamber → cam chamber under the action of negative pressure. → Oil return channel → Oil return check valve → Crankshaft chamber. During the whole process, the lubricating oil mist lubricates the valve train, valve train, tappet assembly and cam assembly in the valve chamber respectively.

[0054] At the same time, the combusted exhaust gas that penetrates into the crankshaft chamber from the gap between the piston and the cylinder block enters the intake hole, oil and gas separation channel and air outlet hole on the crankshaft, and communicates with the exhaust hole when the crankshaft chamber is under positive pressure. The exhaust hole is discharged out of the crankcase; when the oil mist enters the intake hole, the oil mist is converted into liquid oil droplets due to the collision between the crankshaft rotating oil mist and the inner wall of the intake hole, and is thrown back into the crank chamber by the centrifugal force generated by the high-speed rotation of the crankshaft connecting rod group. , which ensures a good oil and gas separation effect. In this way, the circulation of the lubricating oil is completed by the pressure generated by the operation of the piston, and the oil and gas separation is completed through a simple oil and gas separation structure, which is not affected by the angle of the gasoline engine.

[0055] Compared with the traditional hand-held air-cooled four-stroke gasoline engine lubrication system, the solution of the present invention has the advantages of simple structure, smooth circulation of the lubricating oil circulation channel, reliable separation of the oil and gas separation device, effective control of the timing of the exhaust gas, and one-way discharge into the air to ensure that the product can be discharged at any time. The advantages of stable operation under the angle, etc., completely solve the problems of poor lubricating oil circulation, oil and gas separation failure, oil burning, unstable performance and poor reliability when the tools supporting the hand-held four-stroke gasoline engine operate in various positions.

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Classification and recommendation of technical efficacy words

Simple structure

Lubrication system of handheld air-cooled four-stroke gasoline engine and gasoline engine

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

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Description & Claims & Application Information

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