JP2696500B2 - Engine oil separation device for blow-by gas - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil separating apparatus for separating oil from blow-by gas generated in an engine for a gas heat pump as an air conditioner.

[0002]

BACKGROUND OF THE INVENTION The oil separator conventionally, for example, FIG. 6
Some are configured as shown in FIG.

Referring to the drawings, reference numeral 1 denotes a four-stroke engine. This engine 1 has a crankcase 2, a crankshaft 3, a cylinder 4, and a piston 5, and the crankshaft 3 and the piston 5 are connected. They are connected by rods 6. A cylinder head 7 is mounted on the cylinder 4, and a space surrounded by the piston 5 and the cylinder head 7 in the cylinder 4 is a combustion chamber 9.

The cylinder head 7 has an intake port 10
And an exhaust port 11, which are openable and closable by valves (not shown). Each valve is appropriately opened and closed by a valve operating mechanism (not shown) provided on the cylinder head 7. Further, a cylinder head cover 12 that covers the valve mechanism is provided.

The intake passage 14 connected to the intake port 10
And an air cleaner 15 is provided at an upstream end of the intake passage 14. The air cleaner 15 includes a cleaner case 16 and an element 19 that separates an inlet 17 and an outlet 18 formed in the cleaner case 16, and the outlet 18 is formed at the bottom of the cleaner case 16 and is formed at the bottom of the cleaner case 16. It communicates with the upstream end. A throttle 20 is provided in the middle of the intake passage 14.

[0006] An oil pan 22 as an oil storage section is provided at the bottom of the crankcase 2. A lubricating oil 23 is stored in the oil pan 22, and the lubricating oil 23 lubricates various parts of the engine 1 such as a sliding contact between the cylinder 4 and the piston 5.

The operation of the engine 1 is the same as the conventional one. In this operation, after the outside air is sucked through the inlet 17 of the cleaner case 16 and filtered through the element 19 (arrow A in the figure), The fuel is sucked into the combustion chamber 9 together with the fuel through the intake passage 14 (arrow B in the figure), and is burned here. Then, the combustion gas is exhausted through the exhaust port 11 (arrow C in the figure).

When the engine 1 operates, the cylinder 4
The blow-by gas 24 flows into the crankcase 2 from the combustion chamber 9 side through the sliding contact portion between the piston 5 and the piston 5 (arrow D in the figure). Therefore, a collecting device 25 for collecting the blow-by gas 24 is provided.

The collecting device 25 is provided with the crankcase 2.
Labyrinth 27 communicating with the inside of the
A recovery passage 28 leading from inside 7 to the cleaner case 16.
have. An oil separator 29 is provided in the air cleaner 15 separately from the engine 1, and the oil separator 29 is configured by an element 30. Then, the blow-by gas 24 in the crankcase 2 is sucked into the cleaner case 16 through the labyrinth 27 and the recovery passage 28 (arrow E in the figure).

In this case, the oil contained in the blow-by gas 24 is
Is separated when passing through. Then, the blow-by gas 24 after the oil is separated in this way is sucked into the intake passage 14 together with the outside air (arrow F in the drawing), and is introduced into the combustion chamber 9 where it is burned. The oil separated by the element 30 also flows down along the inner surface of the intake passage 14 and is sent into the combustion chamber 9 to be lubricated again or burned.

[0011]

[SUMMARY OF THE INVENTION Incidentally, in the above conventional configuration, when the engine 1 is long-term operation, especially in high load region, NO _x occurs mostly an acidic gases during combustion. The blow-by gas 24 contains water vapor.

On the other hand, as described above, the oil separator 29 is provided separately from the engine 1 and is not easily heated by the engine 1, so that the temperature tends to be low. Therefore, when the blow-by gas 24 is sent to the oil separator 29 as described above, the blow-by gas 24
The above-mentioned water vapor is easily dewed to form dew condensation water, and the above-mentioned acid gas dissolves in the dew condensation water to become a strong acid.

Then, the dew water mixes with the oil separated here in the oil separator 29, thereby producing a strongly acidic emulsion sludge. The emulsion sludge passes through the intake passage 14 and flows into the combustion chamber 9 together with the intake air.
The sliding contact between the cylinder 4 and the piston 5 is corroded by the acidity of the emulsion sludge.

Further, a part of the emulsion sludge passes through the sliding contact portion together with the blow-by gas 24 and returns to the oil pan 22 which is an oil reservoir below the crankcase 2. Is also acidic. Therefore, when each lubricating portion is lubricated by the oil of the oil pan 22, there is a problem that the lubricating portion is corroded.

Further, as described above, when the emulsion sludge is sucked into the combustion chamber 9, the sludge adheres to the spark plug and leaks therefrom, thereby causing a problem that the engine performance is reduced.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made to prevent the generation of emulsion sludge in an oil separation device for blow-by gas of an engine.
In addition to the corrosion of the sliding contact between the cylinder and the piston, the oil in the oil reservoir in the crankcase is prevented from corroding each lubricating part, and the engine performance is kept good. It is another object of the present invention to make it possible to simplify the configuration of the oil separation device.

[0017]

The present invention for achieving the above object is as follows.

[0018] The invention of claim 1, communicates the air cleaner through the intake passage engine, so as to introduce into the engine outside air sequentially through the intake passage with these air cleaner, while the blow-by resulting from the engine Ru provided separately from a plurality of oil separator for separating oil contained in the blow-by gas is sucked gas and the engine
With, connected in series to each other, of the oil separator, the outermost
The blow-by gas after the oil separated in the oil separator the final stage so as to be introduced into the intake passage, each of the oil separated in the above oil separator to the oil reservoir in the crankcase of the same engine A return oil return path is provided,

At least one of the plurality of oil separators
In one oil separator, the element is almost horizontal.
Blow-by gas flowed into the interior from the bottom surface
Later, the oil is discharged outside, and the other oil separators
Block from the nearly vertical side of the element
-After the by-gas flows in, it is discharged outside,

[0020] is provided with a heater for heating the respective oil separators respectively.

According to a second aspect of the present invention, in the first aspect of the present invention, an engine room for housing the engine is provided, and a room temperature sensor for detecting a temperature in the engine room is provided.
When the temperature in the engine room is lower than a predetermined temperature based on the detection signal of the room temperature sensor, each heater is made to function.

According to a third aspect of the present invention, in the first aspect of the present invention, a temperature sensor for detecting a temperature of an oil separator on a more upstream side among the plurality of oil separators is provided, and the temperature sensor detects a temperature of the oil separator. When the temperature of the upstream oil separator is lower than a predetermined temperature, each heater is made to function.

[0023]

The operation according to the first aspect of the invention is as follows.

[0024] That is, Ru Oh provided an oil return passage 43 back to the oil separator oil pan of separated oil in the crankcase 2 of the same engine 1 at 55,76 (oil reservoir) 22
And because, separated oil by the oil separator 29, the oil separator 2
The oil is returned to the oil pan (oil storage section) 22 through the oil return passage 43 without passing through the sliding contact portion between the cylinder 4 and the piston 5 from the 9th side.

Accordingly, the oil is prevented from passing through the sliding contact portion between the cylinder 4 and the piston 5 toward the oil pan (oil storing portion) 22.

Moreover, in the above case, the oil separators 55 and 76
Are provided, and these are connected in series.
The performance of oil separation in the oil separators 55 and 76 is improved,
Accordingly, corrosion of the sliding contact portion is more reliably prevented.
You.

Further , the plurality of oil separators 55 and 76 are used.
That is, at least one of the oil separators 55
The lower part of the element 73, which is substantially horizontal,
After the low-by gas 24 flows in, it is discharged outside
In the other oil separator 76, the element 85 is almost the same.
The blow-by gas 24
Is to be discharged to the outside after the inflow,
The following effects occur.

That is, in one oil separator 55 described above,
The oil captured by the element 73 is
73 is dripped from each part of the substantially horizontal lower surface.
The previous oil is almost evenly distributed on the lower surface of the element 73.
Will be distributed. Therefore, the blow-by gas 24
When flowing into the inside from the lower surface of the element 73
The blow-by gas 24
To flow into each part of the lower surface almost uniformly
Becomes

Accordingly , the element 73 is provided on the lower surface thereof.
Be fully utilized for oil separation, depending on size
Become.

However, with one oil separator 55 described above,
Is the oil flowing down the element 73 and this element
The boom that flows from the lower surface of the
Since it is against the low-by gas 24,
The strike is performed together with the blow-by gas 24 and the element 7.
3 is likely to be discharged from the
It becomes a hindrance factor in improving performance.

On the other hand, in the other oil separator 76 described above,
The oil captured by the element 85 of this element 85
Down toward the bottom of the element 85
The amount of oil contained in the lower part is larger than that in the lower part. For this reason,
The low-by gas 24 flows from the side of the element 85
When flowing into the interior, much of the blow-by gas 24
Passes through the upper side of the element 85
It tends to flow in.

In the above case, above the element 85,
Oil is kept low and the direction of oil flow and the above
Flows almost horizontally into the interior of the body 85
Does not compete with the blow-by gas 24
The separation performance is improved.

However, as described above, other oil separators 7
6, the blow-by biased toward the top of the element 85
Because the gas 24 flows in, the element 85 is located on its side.
Depending on the size of the surface, it is fully utilized for oil separation
It becomes difficult.

Therefore, in the present invention, the one oil component described above is used.
The separator 55 and another oil separator 76 are connected in series.
This results in an overall
-Achieved by-gas 24 treatment and improved oil separation performance
Is done.

Further, each of the oil separators 55 and 76 is
And a heater 44 for heating.

[0036] Therefore, the respective oil separators 55,76 are respectively heated by the heater 44, from being somewhat kept at a high temperature, when the blow-by gas 24 is fed into the oil separator 29, the blow-by gas While the oil contained in the blow-by gas 24 is separated,
The fact that the water vapor in the inside becomes dew condensation water depends on each of the oil separators 5 described above.
5 and 76, and this water vapor passes through each oil separator 55 and 76 as a gas.

[0037] Thus, the fact that the condensation water to the separated oil in each oil separator 55,76 are mixed is being prevented, generation of an emulsion sludge is more reliably prevented.

[0038]

BRIEF DESCRIPTION the drawings real施例of the present invention.

[0039] In Examples of this are the configurations in common with the conventional example shown in FIG. 6, omitted will be denoted the code in the figure, descriptions are configured.

In FIGS. 1 to 3 , the cylinder head
The inside of the bar 12 is formed on the cylinder head 7 or the cylinder 4.
Through the communication passage 40 into the crankcase 2.
You. 41 is a baffle plate.

The blow-by in the crankcase 2
The gas 24 passes through the communication passage 40, the cylinder head cover 12,
And sent to the oil separator 29 through the recovery passage 28
(Arrow D in FIG. 1). This
If the amount of oil coming out of the engine 1 is small,
There is an effect that.

The oil separator 29 is provided separately from the engine 1.
Provided with a plurality of oil separators 55 and 76,
The separators 55 and 76 are connected in series.

Of the plurality of oil separators 55 and 76, one
Oil separator 55 is a casing with a vertical section and a circular section.
The casing 57 has an upper and lower partition
The upper chamber 60, the intermediate chamber 61, and the lower chamber 60 are provided by the plates 58 and 59.
It is partitioned into a chamber 62.

The blow-by gas 24 is introduced into the lower chamber 62.
A suction pipe 67 having a suction port 32 for insertion is attached.
A flexible tube 33 is attached to the suction pipe 67.
The collection passage 28 formed by the connected tubes 33
Is connected to the suction port 32. the above
The end of the suction pipe 67 on the lower chamber 62 side is formed with a thin nozzle 68.
And open upward. The nozzle 68
A hemispherical reversing plate 69, which opens downward, faces the
Have been killed. Also, the oil is returned to the bottom plate of the casing 57.
A passage 43 is provided.

The lower partition plate 59 is a pan having a large number of holes.
It is formed of a metal. Further, the upper partition plate 5
8 is formed in an annular shape in plan view, and downward from the edge of the inner hole.
The partitioning cylinder 70 extends toward this, and this partitioning cylinder 70
Has holes. The lower end opening of this partition cylinder 70 is a lower partition.
Closed by a bottom plate 71 near the upper part of the plate 59,
The bottom plate 71 has an oil hole 72 formed therein.

The outer peripheral wall of the casing 57 and the partition
A zigzag bent step is provided between the cylindrical body 70 and the cylindrical body 70.
Element 73 composed of a number of fine wires made of stainless steel
Have been packed. The lower surface of this element 73 is almost horizontal.
Is blown into the inside of the element 73 from the lower surface.
After the bigas 24 flows in, it is discharged to the outside.
ing. The upper chamber 60 contains blow-by gas 2.
4 is provided, and the swirl vane 74
74 is attached to the upper plate of the casing 57.
A discharge port 75 is formed in the upper plate of the casing 57.
Has been established.

In FIGS. 1 to 3, the plurality of oil separators 5
5 and 76, the other oil separator 76 at the last stage is the shaft center
The casing 78 has a laterally-circular casing 78 having a circular cross section.
The ring 78 has a cylindrical portion 79 and an axial direction of the cylindrical portion 79.
One side plate 80 for closing the side opening and the other side plate closing the other side opening
81. Inside of the casing 78
Is divided into a first chamber 83 narrow by a partition plate 82 and a second chamber wide
84, and the partition plate 82 has a plurality of holes.
It is formed of an etching metal. In the second chamber 84,
An element 85 having the same configuration as the element 30 is filled.
Have been. The side of the element 85 on the first chamber 83 side
The surface is almost vertical, and the side of the element 85
After blow-by gas 24 flows into
It is supposed to be.

A suction port 86 is formed in the upper part of the one side plate 80.
The outlet 75 of the oil separator 29 is connected to the suction port 8.
6 by a tube 87. In addition,
Each center of the side plate 80, the partition plate 82, and the element 85
A discharge pipe 88 penetrating through the discharge pipe is provided.
One end of the loop 88 is surrounded by the other side plate 81 and the element 85.
Open in a partial space of the second chamber 84, and the other end is
Outlet 78 that opens toward the outside of the
You. An oil return passage 43 is provided below the one side plate 80.
Installed. The outlet 34 is communicated with the intake passage 14 downstream of the air cleaner 15 and upstream of the throttle 20 by a flexible tube 35.

In FIGS. 1 and 2, as indicated by arrow E,
The blow-by gas 24 passes through the suction pipe 67 and the lower chamber 6
2, the blow-by gas 24
It is accelerated at 68 and gushes. Then, this blow viger
24 is guided by the reversing plate 69 and turns downward and suddenly reverses.
I do. At this time, the oil in the blow-by gas 24
Attached to the inner surface of the plate 69 and separated from the blow-by gas 24
The oil is released and discharged through the oil return passage 43.

On the other hand, after being inverted by the inversion plate 69,
Of the blow-by gas 24, the lower partition plate 59, the element 7
3 and the partition cylinder 70 in order,
0 to the upper chamber 60 where the swirl vanes 74
Is turned around the vertical axis, and then passes through the discharge port 75.
And is discharged through the suction port 86 of the oil separator 76.
It is sucked into the chamber 83.

The oil separator 55 includes a blower
If the gas 24 passes through the element 73,
4 when it is turned in the blow-by gas 24
Oil is separated and passes through the oil hole 72 of the lower partition plate 59.
To reach the lower chamber 62, and then drain from the oil return passage 43.
And returned to the oil pan 22 (arrows in FIGS. 1 and 2).
I).

The outlet 75 of the main oil separator 55
Sucked into the first chamber 83 through the suction port 86 of the auxiliary oil separator 76
The blow-by gas 24 is supplied to the partition plate 82 and the element
Through the outlet 85 and the discharge pipe 88 in sequence.
34, and is discharged through a tube 35 to the intake passage.
14 (arrow F in FIGS. 1 to 3).

In the above case, the blow-by gas 24
When passing through the outlet 85, the blow-by gas 24
Oil is separated, and the oil passes through the partition plate 82 to the first chamber.
83, the oil is discharged from the oil return passage 43,
It is returned to the pan 22 (arrow I in FIGS. 1-3).

In FIG. 1, each oil separator 55 , 76 has
Each heater 44 is attached. On the other hand, the engine 1 is housed in an engine room 46 of the housing 45. The lower part of the housing 45 has a ventilation outlet 4
5a is formed, a ventilation inlet 45b is formed at the top,
A ventilation fan 47 for ventilating the inside of the housing 45 is attached to the ventilation outlet 45a. A room temperature sensor 48 for detecting the “temperature in the engine room” in the engine room 46 is provided. The engine 1 is provided with a water jacket 49 for cooling, and a water temperature sensor 51 for detecting the temperature of the cooling water 50 in the water jacket 49 is provided.

The heater 44 and the ventilation fan 47 are operated via electronic control means 53 in accordance with respective detection signals of the room temperature sensor 48 and the water temperature sensor 51. In addition, 54 is a heat insulating material, and the heat insulating material 54 is a collecting device 25, a collecting passage 28, a tube 35,
And the heater 44 is covered from the outside to keep them warm.

FIGS. 4 and 5 show a flowchart of the control means 53, and (P-1) to (P-12) show each step of the program.

[0057] In FIG. 4, the detection signal of the room temperature sensor 48, if it is determined "engine room temperature" is lower than the set temperature T _A is a predetermined temperature (P-
1) The heater 44 is operated (P-2), and the oil separator 29 is heated. In the oil separator 29, the generation of dew condensation water due to the water vapor contained in the blow-by gas 24 is prevented. The generation of emulsion sludge is prevented.

Next, if it is judged to be equal to or greater than the set temperature T _B which is "the engine compartment temperature" (P-3), the function of the heater 44 is stopped (P-4), an oil separator 2
Excessive heating of 9 is prevented.

Thereafter, the above steps are sequentially repeated.

The above set temperatures have a relationship of T _A <T _B.

[0061] In FIG. 5, (P-5) at is determined by the water temperature sensor 51 is temperature of the cooling water 50 is set temperature T _a or more, still, set to "engine room temperature" in (P-6) if it is determined that the temperature T _b above, the ventilation fan 47 is oN (P-7), the engine 1 is prevented from becoming too high temperature as a whole.

Next, at (P-8), it is determined that the water temperature of the cooling water 50 is equal to or lower than the set temperature _Tc.
If it is determined in -8) that the water temperature has exceeded the set temperature _Tc , and if it is determined in P-9 that the “engine room temperature” is equal to or lower than the set temperature _Td , the ventilation fan 47 is turned off. (P-10), the inside of the engine room 46 is kept at a predetermined temperature or higher, and the generation of emulsion sludge in the oil separator 29 is prevented.

In FIG . 1, the plurality of oil separators 55,
Among them, a temperature sensor 56 for detecting the “oil separator temperature” of the oil separator 55 on the more upstream side is provided.

The heater 44 and the ventilation fan 47 are operated via the control means 53 in accordance with the respective detection signals of the temperature sensor 56 and the water temperature sensor 51.

[0065] flow chart of the control means 53, in the description of FIG. 4, 5 and this,
The term “engine room temperature” is read as “oil separator temperature”, and the room temperature sensor 48 is referred to as a temperature sensor 56.
It is the same as what was read.

In the illustrated example, the oil return passage 43 extends horizontally from the side plate 80. However, the oil return passage 43 may extend obliquely downward from the side plate 80. By doing so, the oil can be smoothly discharged from the first chamber 83.

[0067]

According to the first aspect of the present invention, an air cleaner communicates with the engine via the intake passage, and outside air is introduced into the engine through the air cleaner and the intake passage sequentially. after inhalation of blow-by gas caused a plurality of oil separator for separating oil contained in the blow-by gas separately from the above engine Rutotomoni, connected in series to each other, of the oil separator
Among them, the blow-by gas after the oil separated by the oil separator in the final stage so as to be introduced into the intake passage, the oil reservoir in the crankcase of the respective oil ditto engine separated in the above oil separator Oil return passage to return to the

At least one of the plurality of oil separators
In one oil separator, the element is almost horizontal.
Blow-by gas flowed into the interior from the bottom surface
Later, the oil is discharged outside, and the other oil separators
Block from the nearly vertical side of the element
-After the by-gas flows in, it is discharged outside,

[0069] Since having a heater for heating the respective oil separators respectively, the following effect.

[0070] That is, because the separated oil in the oil separator was Ru Oh provided an oil return passage back to the oil reservoir in the crankcase of the same engine, the oil separated in the oil separator, the oil separation The oil is returned directly to the oil reservoir through the oil return passage without passing through the sliding portion between the cylinder and the piston from the container side.

Accordingly, the oil is prevented from flowing toward the oil storage portion through the sliding contact portion between the cylinder and the piston. Therefore, even if the oil is acidic,
The sliding contact portion is prevented from being corroded by the acidity of the oil.

In the above case, a plurality of oil separators are provided.
And these were connected in series.
The performance of oil separation in
Corrosion of the part is more reliably prevented.

Further , among the plurality of oil separators, at least
In any one oil separator, almost all of its elements
Blow-by gas flows into the interior from the horizontal lower surface
Is discharged to the outside after
From the nearly vertical side of the element to its interior
After blow-by gas flows into the
Therefore, the following effects occur.

That is, in one oil separator described above,
The oil trapped in the element is almost
The oil is dropped from each part of the flat lower surface.
It will be distributed almost uniformly on each part of the lower surface of the element.
You. For this reason, the blow-by gas is
When flowing into the interior of the blow-by gas,
Each part of the lower surface of the above element passes almost uniformly
Will flow into the department.

Therefore, the above element has a lower surface area.
Will be fully utilized for oil separation
Thus, it is possible to process blow-by gas containing a large amount of oil.

However, in the one oil separator described above, the
Oil flowing down the element and the lower surface of this element
Blow-by gas that rises from
Small oil mist is applied to the blower
It may be discharged from the above element together with Igas.
Therefore, this is an impediment to improving the performance of oil separation.
Cause.

On the other hand, in the other oil separators described above,
The oil trapped in the element goes to the bottom of this element.
Flow down and included at the bottom compared to the top of this element
The amount of oil that is used increases. For this reason, blow-by gas
When flowing into the inside of the element from the side,
Most of the blow-by gas is located on the upper side of the element.
Through it.

In the above case, at the top of the element, the oil
The direction of oil flow and the element
Blows from the side of the port into the interior almost horizontally
Since it does not compete with bigas, oil separation performance is improved.
Up.

However, as described above, other oil separators
The blow-by gas flows to the top of the element
To fit the above element, depending on the width of its side
Are not fully utilized for oil separation,
Blow-by gas containing oil becomes difficult to process.

Therefore, in the present invention, one of the aforementioned characteristics
Oil separator and other oil separator were connected in series.
Yes, this results in an overall
Bigas treatment and improved oil separation performance were achieved,
Thereby, the corrosion of the sliding contact portion is more reliably prevented.
You.

[0081] Further, it the oil separator as described above
And a heater for heating.

[0082] Therefore, each of the oil separator is heated respectively by the heaters, from being somewhat kept at a high temperature, when the blow-by gas is fed into the oil separator, the oil contained in the blow-by gas separator On the other hand, the water vapor in this blow-by gas becomes condensation water
Is prevented by each of the above oil separators , and this water vapor passes through each oil separator as a gas.

Therefore, it is possible to prevent the dewatered water from being mixed with the oil separated by each of the oil separators, and to more reliably prevent the generation of emulsion sludge.

As a result, corrosion of the sliding contact portion between the cylinder and the piston due to the acidity of the emulsion sludge is more effectively prevented, and each lubricating portion is corroded by the oil in the oil storage portion. Is also prevented. Further, since the emulsion sludge is prevented from leaking the spark plug of the engine, poor starting and misfire are prevented, and the engine performance is kept good.

[0085] Moreover, by the above oil separator is heated by the heater, respectively, for the generation of the emulsion sludge is prevented, oil separated in the oil separator are each smoothly the oil return passage flows And is returned to the oil storage section in the crankcase.

Therefore, the oil smoothly flows through the oil return passage.
That amount, since it is not necessary to excessively increase the cross-sectional area of the oil return passage, so the oil separation apparatus described above, sliding contact
The structure can be simplified while various effects of effectively preventing corrosion of the part and maintaining good engine performance can be achieved.

According to the invention of claim 2, according to the invention of claim 1, an engine room for housing the engine is provided,
A room temperature sensor for detecting the temperature in the engine room is provided, and when the temperature in the engine room is lower than a predetermined temperature based on a detection signal from the room temperature sensor, each heater is made to function.

[0088] Therefore, even though the temperature is high around the oil separator, is prevented that the these oil separator thus heated unnecessarily excessively, thus, the heat in the heaters Useless consumption is suppressed.

According to a third aspect of the present invention, in the first aspect of the present invention, a temperature sensor for detecting a temperature of an oil separator on a more upstream side among the plurality of oil separators is provided .
The temperature of the upstream oil separator is
When the temperature is lower than the constant temperature, each heater is made to function .

[0090] blowby Therefore, it detected more directly the temperature of the oil separator Rutotomoni, on the upstream side of the oil separator
If gas flows in, the temperature of the oil separator is immediately detected.
Is, in other words, from Rukoto this detection is performed quickly, excessive heating of the oil separator is prevented more accurately Rutotomoni,
Emulsion sludge generation in each oil separator
It is surely prevented.

[0091] Thus, Rutotomoni be more reliably prevented wasteful consumption of heat in the heaters, corrosion of the sliding contact portion
Effectively prevented.

[Brief description of the drawings]

1 is a whole simplified partial cross-sectional view.

Figure 2 is a partially enlarged cross-sectional view of FIG.

FIG. 3 is a partially enlarged sectional view of FIG . 1 ;

FIG. 4 is a flow chart.

FIG. 5 is another flowchart .

FIG. 6 is a diagram corresponding to FIG . 1 in a conventional example .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine 2 Crankcase 14 Intake passage 15 Air cleaner 22 Oil pan (oil storing part) 23 Lubricating oil 24 Blow-by gas 29 Oil separator 34 Outlet 43 Oil return passage 44 Heater 46 Engine room 48 Room temperature sensor 55 Oil separator (one Oil separator) 56 Temperature sensor 73 element 76 Oil separator (other oil separator) 85 element

Continuation of the front page (56) References JP-A-59-70824 (JP, A) JP-A-61-92708 (JP, U) JP-A-58-154809 (JP, U) JP-A-56-9904 (JP) , U) Hikaru 4-59319 (JP, U)

Claims (3)

(57) [Claims] An air cleaner communicates with an engine via an intake passage so that outside air is introduced into the engine sequentially through the air cleaner and the intake passage. a plurality of oil separator for separating oil contained in the blow-by gas Rutotomoni provided separately from the aforementioned engine, together
Connected in series, among the oil separators, the blow-by gas after the oil is separated by the last-stage oil separator is introduced into the intake passage, and separated by each of the oil separators. It
An oil return passage for returning each oil to an oil storage section in a crankcase of the engine ; and at least one of the plurality of oil separators
For oil separators, is the bottom of the element almost level?
After the blow-by gas flows into it, then discharges it to the outside
Other oil separators have more than that element.
Blow-by gas flows into the inside from the vertical side.
After entering, so as to be discharged to the outside, the blow-by gas oil separation device for an engine provided with a heater for heating the respective oil separators respectively. Wherein providing the engine room for accommodating the engine, when the room temperature sensor for detecting the temperature in the engine room is provided, the detection signal of the room temperature sensor temperature in the engine room is lower than the predetermined temperature, the The oil separation device for blow-by gas of an engine according to claim 1, wherein the heater functions. 3. A temperature sensor for detecting the temperature of a more upstream oil separator among a plurality of oil separators , wherein the temperature of the upstream oil separator is lower than a predetermined temperature by a detection signal of the temperature sensor. 2. The engine blow-by gas oil separation device according to claim 1, wherein each heater is operated when the temperature is also low.