CN202402161U - Gasoline engine respiratory system without bearing structure - Google Patents

Abstract

A gasoline engine breathing system with no bearing structure, comprising a cylinder head and a crankcase arranged on the cylinder head, the cylinder head is provided with an oil inlet hole, and the crankcase is provided with a lubricating channel and an oil storage tank, and is characterized in that : The crankcase is provided with a breathing passage and communicates with the oil inlet hole, the lubricating channel and the oil storage tank. The utility model is provided with a breathing passage on the crankcase and is connected with the oil inlet hole, the lubricating channel and the oil storage tank, so that the mixed oil gas of air and engine oil can lubricate the crankshaft through the lubricating oil passage and the oil storage tank, and at the same time enter the cylinder head through the oil inlet hole. The internal circulation is formed in the gasoline engine, and part of the mixed oil gas is filtered for the first time in the internal circulation process, and then is filtered through the labyrinth for the second time, which realizes the full lubrication of the gasoline engine with a bearingless structure, and effectively controls the fuel injection volume of the gasoline engine, which not only prolongs the life of the equipment. service life and reduce environmental pollution.

Description

A Gasoline Engine Breathing System with Bearingless Structure

technical field

The utility model relates to a breathing system for a gasoline engine, in particular to a breathing system for a gasoline engine without a bearing structure.

Background technique

At present, the crankshaft and crankcase of general-purpose gasoline engines are mostly matched by bearings. There are also some crankshafts and crankcases that adopt a bearingless structure, that is, the crankcase and the crankshaft are directly matched. The mixed oil and gas of the engine oil are directly discharged through the breather valve. This structure easily leads to a relatively large fuel injection volume of the gasoline engine, causing pollution to the environment.

Utility model content

The purpose of the utility model is to provide a breathing system of a gasoline engine with a bearingless structure and a gasoline engine with a small fuel injection volume.

The purpose of this utility model is achieved in that a gasoline engine breathing system with no bearing structure includes a cylinder head and a crankcase arranged on the cylinder head, the cylinder head is provided with an oil inlet hole, and the crankcase is provided with There is a lubricating passage and an oil storage tank, and the feature is that: the crankcase is provided with a breathing passage and communicates with the oil inlet hole, the lubricating passage and the oil storage tank.

A labyrinth is provided inside the crankcase, and the cylinder head communicates with the labyrinth.

The above-mentioned labyrinth includes filter screen, oil return hole, exhaust port and breather valve sheet.

Due to the long breathing passage on the crankcase, the pressure in the crankcase cannot be released in time during the downward movement of the piston. internal partial pressure.

When the gasoline engine is running, the pressure generated in the crankcase when the piston descends presses the mixed oil and gas in the crankcase from the lubricating oil passage into the respiratory passage, and part of the mixed oil and gas condenses in the lubricating oil passage and is stored in the oil storage tank to lubricate the crankshaft and crankcase; The remaining mixed oil and gas enter the cylinder head through the oil inlet hole connected with the respiratory tract, part of the mixed oil and gas condenses in the cylinder head and returns to the crankcase through the oil return hole on the cylinder head, and the other part of the mixed oil and gas passes through the space of the valve push rod on the cylinder head Under the pressure in the crankcase, the breather valve is opened to enter the labyrinth. Part of the mixed oil and gas is condensed at the filter screen in the labyrinth, and the rest is discharged through the exhaust port on the labyrinth. During the descending process of the piston, since the airway on the crankcase is relatively long, the release of the pressure in the crankcase can be strengthened through the breathing holes provided on the crankcase, and the pressure in the crankcase can be effectively guaranteed. When the piston moves upward, the pressure in the crankcase decreases, and the crankcase is under negative pressure, the breathing valve is closed under the negative pressure, and the oil condensed in the labyrinth is sucked back to the crankshaft through the oil return hole under the negative pressure inside the box.

The utility model has the following beneficial effects. The utility model is provided with a breathing passage on the crankcase and communicates with the oil inlet hole, the lubricating channel and the oil storage tank, so that the mixed oil gas of air and engine oil can lubricate the crankshaft through the lubricating oil passage and the oil storage tank, and at the same time, the The oil inlet hole enters the cylinder head and forms an internal circulation in the gasoline engine. During the internal circulation process, part of the mixed oil and gas is filtered for the first time, and then filtered through the labyrinth for the second time, which realizes the full lubrication of the gasoline engine with a bearingless structure and effectively controls the gasoline engine. The amount of fuel injected not only prolongs the service life of the equipment, but also reduces environmental pollution.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is a schematic diagram of the structure of the labyrinth of the embodiment of the utility model.

Detailed ways

Embodiment, a kind of general gasoline engine breathing system, comprises cylinder head 13 and is arranged on the crankcase 5 on cylinder head 13, is provided with oil inlet hole 12, oil return hole II14 on cylinder head 13, is provided with crankshaft 7 on crankcase 5 , lubricating oil channel 6, oil storage tank 8, airway 10, labyrinth 11, return oil channel 15 and breathing small hole 9, airway 10 communicates with the oil inlet hole 12 on the cylinder head 13, cylinder head 13 communicates with the labyrinth 11, and the labyrinth 11 There is an oil return hole Ⅰ3, an exhaust port 1, a breathing valve 2 and a filter 4 in the labyrinth 11, and the breathing passage 10 is connected to the oil inlet 12 and the lubricating oil passage 6, the oil storage tank 8, the breathing small hole 9 and the labyrinth 11 connectivity.

When the piston descends, the pressure in the crankcase 5 increases, and the mixed oil and gas in the crankcase body 5 enters the lubricating oil passage 6 under pressure, and part of the mixed oil and gas condenses in the lubricating oil passage 6 and is stored in the oil storage tank 8. The rest of the oil and gas enter the air passage 10 on the crankcase 5, enter the cylinder head 13 through the cylinder head oil inlet hole 12 connected with the air passage 10, and part of the mixed oil and gas condenses in the cylinder head 13 and passes through the oil return hole of the cylinder head 14 flows back to the crankcase body 5 through the oil return passage 15; another part of the mixed oil and gas passes through the space of the valve push rod on the cylinder head to open the breathing valve plate 2 and enter the labyrinth 11 under the pressure inside the crankcase 5, and a part of the mixed oil and gas enters the labyrinth 11. The filter screen in the labyrinth 11 is condensed at 4 places, and the rest are discharged through the exhaust port 1 on the labyrinth 11 . Because the casing breathing passage 10 passage is longer, the pressure that can not be released in time in the crankcase 5 is released through the small breathing hole 9. When the piston moves upward, the pressure in the crankcase 5 decreases, and the crankcase 5 is under negative pressure at this time, the breathing valve plate 2 is closed under the negative pressure, and the condensed engine oil in the labyrinth 11 passes through the oil return hole under the negative pressure Ⅰ3 is sucked back into the crankcase body 5.

Claims (4)

1. A gasoline engine breathing system with a bearingless structure, comprising a cylinder head (13) and a crankcase (5) arranged on the cylinder head (13), the cylinder head (13) is provided with an oil inlet hole (12) , the crankcase (5) is provided with a lubricating channel (6) and an oil storage tank (8), characterized in that: the crankcase (5) is provided with a breathing passage (10) and communicated with the oil inlet hole (12 ) and lubrication channel (6), oil storage tank (8). 2. The breathing system of a gasoline engine with a bearingless structure according to claim 1, characterized in that: a labyrinth (11) is provided in the crankcase (5) and communicates with the cylinder head (13). 3. The gasoline engine breathing system with bearingless structure according to claim 2, characterized in that: the labyrinth (11) includes a filter screen (4), an oil return hole I (3), an exhaust port (1) and a breather Valve disc (2). 4. The breathing system of a gasoline engine with a bearingless structure according to claim 2 or 3, characterized in that: the crankcase (5) is provided with a small breathing hole (9) and communicates with the labyrinth (11).

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