CN213807792U - Non-road diesel engine crankcase ventilation system - Google Patents
Non-road diesel engine crankcase ventilation system Download PDFInfo
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- CN213807792U CN213807792U CN202022862270.7U CN202022862270U CN213807792U CN 213807792 U CN213807792 U CN 213807792U CN 202022862270 U CN202022862270 U CN 202022862270U CN 213807792 U CN213807792 U CN 213807792U
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Abstract
The utility model provides a non-road diesel engine crankcase ventilation system, be equipped with cylinder body side ventilation chamber and cylinder cap side ventilation hole of admitting air, still be equipped with cylinder body exhaust side ventilation chamber and cylinder cap exhaust side ventilation hole, thereby the gas of crankcase can ventilate simultaneously and the oil return in the both sides of diesel engine cylinder body, be equipped with simultaneously and be used for the oil gas separator in advance that the gas of cylinder cap side ventilation hole of admitting air and cylinder cap exhaust side ventilation hole combustion gas carries out the oil gas separation in advance, it is equipped with the external oil gas separator of second grade to be linked together with the oil gas separator in advance through the oil gas takeover, it is equipped with the oil return pipe that is used for with the drainage of backward flow machine oil to the oil pan to connect with the external oil gas separator of second grade. The ventilation path is many, and the ventilation cavity area is big, the resistance is little, ventilates more unobstructed.
Description
Technical Field
The utility model belongs to the technical field of the internal combustion diesel engine technique and specifically relates to a non-road diesel engine crankcase ventilation system is related to.
Background
In the working and running process of the diesel engine, because a gap is formed between a piston ring and a cylinder wall, part of gas inevitably continuously flows into a crankcase of the diesel engine from a combustion chamber, and if the part of gas is not guided out, the pressure of the crankcase in the diesel engine is gradually increased, so that an oil seal is damaged, and the gas of the crankcase is leaked to pollute the environment; in addition, the high temperature exhaust gas and the acidic substances and water vapor in the exhaust gas entering the crankcase corrode parts and deteriorate the performance of the lubricating oil, and therefore, the diesel engine is provided with a crankcase ventilation system for exhausting the exhaust gas.
Since the direct discharge of these gases into the atmosphere entails environmental pollution, forced ventilation is widely used in the market to treat the exhaust gases in the crankcase of diesel engines.
In the prior art, the forced ventilation mode of the crankcase of the diesel engine generally conducts crankcase ventilation from a push rod hole on one side of a cylinder body, the path of a circuit for crankcase ventilation is few, resistance is large, and the crankcase ventilation system is unsmooth.
With the stricter and stricter requirements of emission regulations, the ventilation efficiency and the oil-gas separation effect of the crankcase ventilation system of the diesel engine are critical to the performance and emission of the whole vehicle, so that how to improve the ventilation effect of the crankcase of the diesel engine is a technical problem to be solved urgently for technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a non-road diesel engine crankcase ventilation system.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be: a non-road diesel engine crankcase ventilation system comprises a diesel engine cylinder body and a diesel engine cylinder cover, wherein a cylinder body air inlet side ventilation cavity is arranged on the air inlet side of the diesel engine cylinder body, a cylinder body air inlet side ventilation hole is formed in the top surface of the diesel engine cylinder body and communicated with the cylinder body air inlet side ventilation cavity, and a cylinder cover air inlet side ventilation hole is formed in the diesel engine cylinder cover and communicated with the cylinder body air inlet side ventilation hole correspondingly; a cylinder body exhaust side ventilation cavity is arranged on the exhaust side of the diesel engine cylinder body, a cylinder body exhaust side vent hole is formed in the top surface of the diesel engine cylinder body and communicated with the cylinder body exhaust side ventilation cavity, and a cylinder cover exhaust side vent hole is formed in the diesel engine cylinder cover and communicated with the cylinder body exhaust side vent hole; the oil-gas pre-separation device is also provided with an oil-gas pre-separator for pre-separating oil and gas from gas discharged from the air inlet side vent hole and the air outlet side vent hole of the cylinder cover, a second-stage plug-in oil-gas separator is communicated with the oil-gas pre-separator through an oil-gas connecting pipe, and an oil return pipe for guiding the backflow engine oil to an oil pan is connected with the second-stage plug-in oil-gas separator.
Furthermore, an inter-cylinder vent convenient for mutual ventilation between adjacent cylinders is arranged on a lower partition plate between two adjacent cylinder holes of the diesel engine cylinder body.
Furthermore, the oil return pipe comprises an oil return rubber pipe and an oil return metal pipe, wherein one end of the oil return rubber pipe is connected with the second-stage plug-in oil-gas separator, and the oil return metal pipe is connected to the other end of the oil return rubber pipe.
Furthermore, one end of the oil return metal pipe is fixedly connected with the oil return rubber pipe, and the other end of the oil return metal pipe is buried below the oil level of the engine oil in the oil pan.
Further, the cylinder head intake side vent hole is located outside the cylinder head connection bolt hole.
Further, the cylinder cover air inlet side vent hole and the cylinder cover air outlet side vent hole are provided with slopes which are inclined downwards towards the center of the corresponding vent hole at the outlet of the top end of the cylinder cover so as to be beneficial to oil return.
Furthermore, the part of the air inlet side vent of the cylinder cover passing through the oil sprayer oil return channel is arranged below the oil sprayer oil return channel, and the oil sprayer oil return channel is a suspended oil return channel.
Further, a cylinder cover hood is arranged at the top end of the diesel engine cylinder cover, and the pre-oil-gas separator is fixedly connected and installed with the cylinder cover hood.
Has the advantages that:
according to the utility model discloses, scurry into the gas in the crankcase not only can ventilate and return oil through cylinder body side ventilation chamber that admits air and cylinder cap side ventilation hole that admits air, but also can ventilate and return oil through cylinder body exhaust side ventilation chamber and cylinder cap exhaust side ventilation hole to the gas of diesel engine crankcase can ventilate simultaneously and return oil in the both sides of diesel engine cylinder body. The structure can ensure that when the diesel engine inclines, no matter the diesel engine inclines towards the air inlet side or the air outlet side of the diesel engine, the engine oil can quickly flow back to the oil sump below the crankcase from the top end of the cylinder cover of the diesel engine. The ventilation path is many, and the ventilation cavity area is big, the resistance is little, ventilates more unobstructed.
Additionally, because the utility model discloses a both sides ventilation and oil return to the speed that the crankcase ventilates can reduce to some extent, but the internal gas pressure of diesel engine can be more stable, simultaneously the utility model discloses a oil and gas separator combines with the external formula oil and gas separator of second grade in advance, and when gaseous when passing through oil and gas separator, oil-gas separation also can be more abundant and thorough, thereby can improve the condition that oil-gas separation efficiency is low among the prior art, extension machine oil life and durability prevent that machine oil from carbonizing.
In the preferred scheme, because be equipped with the ventilation hole between the cylinder on the lower part baffle between two adjacent cylinder holes, the crankcase gas can also ventilate through ventilation hole between the cylinder, is favorable to keeping each cylinder pressure balance, reduces the ventilation resistance, reduces the resistance and consumes power for oil-gas separation efficiency is higher, further guarantees the effect that the crankcase ventilates.
The present invention will be described in further detail with reference to the drawings and specific examples.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a top view of a diesel engine block.
FIG. 3 is a top view of a diesel engine cylinder head.
Fig. 4 is a rotated view of a-a in fig. 3.
In the figure, 1, a cylinder body exhaust side ventilation cavity, 2, a cylinder cover exhaust side ventilation hole, 3, a pre-oil-gas separator, 4, a cylinder cover, 5, an oil-gas connecting pipe, 6, a two-stage external-hanging oil-gas separator, 7, a cylinder cover air inlet side ventilation hole, 8, a cylinder body air inlet side ventilation cavity, 9, an oil return rubber pipe, 10, an inter-cylinder ventilation hole, 11, an oil return metal pipe, 12, a cylinder cover connecting bolt hole, 13, an oil injector oil return channel, 14 and a cylinder body connecting bolt hole.
Detailed Description
A non-road diesel engine crankcase ventilation system comprises a diesel engine cylinder body M and a diesel engine cylinder cover N, wherein a cylinder body air inlet side ventilation cavity 8 is arranged on the air inlet side of the diesel engine cylinder body M, a cylinder body air inlet side ventilation hole is formed in the top surface of the diesel engine cylinder body M and communicated with the cylinder body air inlet side ventilation cavity 8, and a cylinder cover air inlet side ventilation hole 7 is formed in the diesel engine cylinder cover N and communicated with the cylinder body air inlet side ventilation hole correspondingly; the exhaust side of the diesel engine cylinder body M is provided with a cylinder body exhaust side ventilation cavity 1, a cylinder body exhaust side ventilation hole is formed in the top surface of the diesel engine cylinder body M and communicated with the cylinder body exhaust side ventilation cavity 1, and a cylinder cover exhaust side ventilation hole 2 is formed in the diesel engine cylinder cover N and communicated with the cylinder body exhaust side ventilation hole.
Referring to fig. 2 and 3, the present embodiment will be described in detail with reference to a four-cylinder diesel engine.
In this embodiment, the cylinder block air intake side ventilation cavity 8 is provided with eight cylinder block air intake side ventilation holes corresponding to the top surface of the diesel engine cylinder block M, each of which is indicated by the serial numbers 8-1 to 8-8 in fig. 2, the eight cylinder block air intake side ventilation holes are arranged in a straight line at the air intake side of the diesel engine cylinder block M, and two cylinder block air intake side ventilation holes are divided into 4 groups, which are respectively arranged corresponding to the four cylinders and located outside the corresponding side cylinder cap connection bolt holes 12. In the embodiment, the eight cylinder body air inlet side air holes 8-1-8 are holes for installing a tappet and a push rod in the air distribution mechanism.
In the embodiment, eight cylinder cover air inlet side vent holes 7 are formed in the cylinder cover N of the diesel engine and are respectively shown as serial numbers 7-1-7-8 in figure 3. The eight cylinder cover air inlet side vent holes 7-1-7-8 correspond to the eight cylinder body air inlet side vent holes 8-1-8 one by one.
In this embodiment, the cylinder exhaust side ventilation cavity 1 is provided with eight cylinder exhaust side ventilation holes corresponding to the top surface of the diesel engine cylinder M, which are respectively indicated by the numbers 1-1 to 1-8 in fig. 2, the eight cylinder exhaust side ventilation holes 1-1 to 1-8 are arranged in a straight line on the exhaust side of the diesel engine cylinder M, and two groups of the eight cylinder exhaust side ventilation holes are 4 groups and are respectively arranged corresponding to four cylinders. In this embodiment, a cylinder head connecting bolt hole 12 is provided between each group of two cylinder block exhaust side vent holes 1-1 to 1-8 of the eight cylinder block exhaust side vent holes. When the diesel engine cylinder body M is connected with the diesel engine cylinder cover N, the cylinder cover connecting bolt holes 12 correspond to the cylinder body connecting bolt holes 14 one by one, and then the connection is carried out through bolts.
In the present embodiment, as shown in fig. 3, the number of the cylinder head exhaust side vent holes 2 provided in the cylinder head N of the diesel engine is 3, and they are respectively shown as numbers 2-1 to 2-3 in fig. 3. And one cylinder cover exhaust side vent hole corresponds to two cylinder body exhaust side vent holes.
The structures of the cylinder body air inlet side ventilation cavity 8 and the cylinder body air exhaust side ventilation cavity 1 are designed along with the shape in the cylinder body of the diesel engine, so that the interface area of a cavity channel can be maximized as much as possible, and ventilation and oil return are facilitated.
Preferably, the air inlet side vent hole 7 and the air outlet side vent hole 2 of the cylinder cover are positioned at the outlet of the top end of the cylinder cover and are provided with slopes descending and inclining towards the center of the vent hole so as to be beneficial to oil return.
Preferably, the part of the cylinder cover air inlet side vent hole 7 passing through the oil injector oil return channel is arranged below the oil injector oil return channel 13, and the oil injector oil return channel 13 is a suspended oil return channel, so that engine oil carried by air in the ventilation process can return more smoothly along the hole wall of the cylinder cover air inlet side vent hole 7 during oil return, and the oil return efficiency is improved.
The oil-gas pre-separator is also provided with an oil-gas pre-separator 3 for pre-separating oil and gas discharged from the cylinder cover air inlet side vent hole 7 and the cylinder cover exhaust side vent hole 2, a secondary external oil-gas separator 6 is communicated with the oil-gas pre-separator 3 through an oil-gas connecting pipe 5, and an oil return pipe communicated with an oil pan is connected with the secondary external oil-gas separator 6.
In this embodiment, a cylinder head cover 4 is arranged at the top end of the diesel engine cylinder head, the cylinder head cover 4 is an aluminum casting, bolt holes are pre-cast on the cylinder head cover 4, and the pre-oil-gas separator 3 and the cylinder head cover 4 are installed together through bolts.
Specifically, two ends of the oil-gas connecting pipe 5 can be correspondingly connected with the air outlet of the pre-oil-gas separator 3 and the secondary plug-in oil-gas separator 6 by adopting a hoop respectively.
In this embodiment, the oil return pipe includes an oil return rubber pipe 9 having one end connected to the two-stage external oil-gas separator 6, and an oil return metal pipe 11 connected to the other end of the oil return rubber pipe 9. Specifically, two ends of the oil return rubber pipe 9 can be correspondingly connected with an oil outlet of the two-stage external oil-gas separator 6 and one end of the oil return metal pipe 11 by using a hoop respectively; the other end of the oil return metal pipe 11 is buried below the oil level in the oil pan P. The oil return metal pipe 11 is fixed to the oil pan P by a flange.
And the lower partition plate of two adjacent cylinder holes is provided with an inter-cylinder ventilation hole 10 which is convenient for mutual ventilation between the adjacent cylinders, so that the pressure balance of each cylinder support can be ensured, the ventilation resistance is reduced, and the resistance power consumption is reduced.
The utility model discloses in the diesel engine operation in-process, the side ventilation chamber 8 admits air with the cylinder cap from the cylinder body admits air side ventilation hole 7 and cylinder body exhaust side ventilation chamber 1 and cylinder cap exhaust side ventilation hole 2 enter into oil and gas separator 3 in advance, then it takes over 5 entering external oil and gas separator 6 of second grade through the oil gas, wherein the machine oil of separation directly arranges oil pan P through oil return rubber tube 9 and oil return tubular metal resonator 11 in, 11 lower extremes of oil return tubular metal resonator submerge below oil pan machine oil liquid level, ensure that oil drainage passageway of oil and gas separator is sealed by the machine oil in the oil pan all the time, guarantee that the crankcase gas can not follow this side and go into oil and gas separator against the current.
The utility model discloses in, scurry into the gas in the crankcase not only can ventilate and the oil return through cylinder body air inlet side ventilation chamber 8 and cylinder cap air inlet side ventilation hole 7, but also can ventilate and the oil return through cylinder body exhaust side ventilation chamber 1 and cylinder cap exhaust side ventilation hole 2 to the gas of crankcase can ventilate simultaneously and the oil return in the both sides of diesel engine cylinder body. In particular, when the diesel engine is inclined, the engine oil can quickly flow back to the oil pan below the crankcase from the top end of the cylinder head of the diesel engine no matter the engine oil is inclined to the air inlet side or the exhaust side of the diesel engine.
The utility model discloses owing to adopt both sides to ventilate and the oil return, it sets up ventilation hole 10 between the cylinder of mutual ventilation preferably on adjacent cylinder hole lower part baffle to the speed that the crankcase ventilates reduces to some extent, but the gas pressure in the diesel engine body can be more stable, when gaseous when passing through oil and gas separator, oil-gas separation also can be more abundant and thorough, combine oil and gas separator and the external formula oil and gas separator 6's of second grade setting in advance simultaneously, thereby can thoroughly improve the condition that oil and gas separation efficiency is low among the prior art, extension machine oil life-span and durability, prevent the machine oil carbonization.
Parts not described in detail herein are prior art.
It should be noted that the above embodiments are only used for illustrating the present invention, but the present invention is not limited to the above embodiments, and any simple modification, equivalent change and modification made to the above embodiments by the technical spirit of the present invention all fall into the protection scope of the present invention.
Claims (8)
1. An off-road diesel engine crankcase ventilation system characterized by: the diesel engine cylinder cover is correspondingly communicated with the cylinder body air inlet side ventilation hole to be provided with a cylinder cover air inlet side ventilation hole; a cylinder body exhaust side ventilation cavity (1) is arranged on the exhaust side of the diesel engine cylinder body, a cylinder body exhaust side ventilation hole is formed in the top surface of the diesel engine cylinder body and communicated with the cylinder body exhaust side ventilation cavity (1), and a cylinder cover exhaust side ventilation hole is formed in the diesel engine cylinder cover and communicated with the cylinder body exhaust side ventilation hole; the oil-gas pre-separation device is also provided with an oil-gas pre-separator (3) used for pre-separating oil and gas from gas discharged from the air inlet side vent hole and the air outlet side vent hole of the cylinder cover, a secondary external oil-gas separator (6) is communicated with the oil-gas pre-separator (3) through an oil-gas connecting pipe (5), and an oil return pipe used for guiding backflow engine oil to an oil pan is connected with the secondary external oil-gas separator (6).
2. The off-road diesel crankcase ventilation system of claim 1 wherein: and an inter-cylinder ventilation hole which is convenient for mutual ventilation between adjacent cylinders is arranged on a lower partition plate between two adjacent cylinder holes of the diesel engine cylinder body.
3. The off-road diesel crankcase ventilation system of claim 1 wherein: the oil return pipe comprises an oil return rubber pipe (9) and an oil return metal pipe (11), wherein one end of the oil return rubber pipe is connected with the second-stage plug-in type oil-gas separator (6), and the oil return metal pipe is connected to the other end of the oil return rubber pipe (9).
4. The off-road diesel crankcase ventilation system of claim 1 wherein: one end of the oil return metal pipe (11) is fixedly connected with the oil return rubber pipe (9), and the other end of the oil return metal pipe is buried below the oil level of the engine oil in the oil pan.
5. The off-road diesel crankcase ventilation system of claim 1 wherein: the cylinder cover air inlet side ventilation hole is located in the outer side of the cylinder cover connecting bolt hole.
6. The off-road diesel crankcase ventilation system of claim 1 wherein: the air inlet side vent hole and the air outlet side vent hole of the cylinder cover are provided with slopes which are inclined downwards towards the center of the corresponding vent hole at the outlet of the top end of the cylinder cover so as to be favorable for oil return.
7. The off-road diesel crankcase ventilation system of claim 1 wherein: the part of the cylinder cover air inlet side vent passing through the oil sprayer oil return passage is arranged below the oil sprayer oil return passage, and the oil sprayer oil return passage is a suspended oil return passage.
8. The off-road diesel crankcase ventilation system of claim 1 wherein: the top end of the diesel engine cylinder cover is provided with a cylinder cover, and the pre-oil-gas separator (3) is fixedly connected and installed with the cylinder cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022862270.7U CN213807792U (en) | 2020-12-03 | 2020-12-03 | Non-road diesel engine crankcase ventilation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022862270.7U CN213807792U (en) | 2020-12-03 | 2020-12-03 | Non-road diesel engine crankcase ventilation system |
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| Publication Number | Publication Date |
|---|---|
| CN213807792U true CN213807792U (en) | 2021-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022862270.7U Active CN213807792U (en) | 2020-12-03 | 2020-12-03 | Non-road diesel engine crankcase ventilation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370350A (en) * | 2022-01-04 | 2022-04-19 | 第一拖拉机股份有限公司 | Non-road diesel engine cylinder cover with bilateral ventilation oil return channels |
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2020
- 2020-12-03 CN CN202022862270.7U patent/CN213807792U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370350A (en) * | 2022-01-04 | 2022-04-19 | 第一拖拉机股份有限公司 | Non-road diesel engine cylinder cover with bilateral ventilation oil return channels |
| CN114370350B (en) * | 2022-01-04 | 2022-11-22 | 第一拖拉机股份有限公司 | Non-road diesel engine cylinder cover with double-side ventilation oil return channel |
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