JPH09310609A - Blowby gas circulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blowby gas circulation device which avoids an adverse effect due to heating of a throttle body, and prevents fixation of a throttle valve under a cold time. SOLUTION: A passage composed of a new air introduction pipe which connects an intake passage 3 on an upstream side of a throttle valve to a cylinder head cover. Another passage is composed of a blowby gas reflux pipe which connects the head cover to the intake pasage 3 on the downstream side of the throttle valve. A trapper means 21 having a box-like chamber 24, a tubular member 25, and a port 26 is arranged on the way of the new air introduction passage. Under a partial load, negative pressure inside the intake pasage 3 is comparatively increased on the downstream side of the throttle valve, and an inner space of an engine 1 is scavenged. Water stored in the chamber 24 is scavenged by the negative pressure. Under a total load, a part of the blowby gas performs contraflow through he new air introduction passage, and introduced to the upstream side of the throttle valve. The moisture inside the blowby gas is trapped by the trapper means 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-by gas recirculation device.

[0002]

2. Description of the Related Art Conventionally, as this type of technology, a collection of automobile technology cases (Issue No. 95090, Issued February 1, 1995)
The one disclosed on 0th day) is known. In this technique, the blow-by gas recirculation device is configured as shown in FIG. That is, the fresh air introduction passage 54 is provided so as to connect the upstream side of the throttle valve 52 provided in the middle of the intake passage 51 and the head cover 53 of the engine. Further, a blow-by gas recirculation passage 55 is provided so as to connect the head cover 53 and the intake passage 51 on the downstream side of the throttle valve 52. Further, in the middle of the blowby gas recirculation passage 55,
A PCV (Positive Crank Case Ventilation) valve 56 that is opened and closed according to the operating state is provided.

In the above technique, a negative pressure is generated downstream of the throttle valve 52 when the opening of the throttle valve 52 is relatively small and a partial load is applied. At this time, the PCV valve 56 is opened, and the blow-by gas generated inside the engine (in the crankcase) is drawn to the downstream side of the throttle valve 52 by the negative pressure. That is, the blow-by gas flows out to the intake passage 51 on the downstream side of the throttle valve 52 via the blow-by gas recirculation passage 55 while being cleaned by the fresh air from the fresh air introduction passage 54. As a result, scavenging inside the engine is achieved.

On the other hand, the negative pressure generated downstream of the throttle valve 52 is small when the throttle valve 52 has the maximum opening and full load. Therefore, no matter how much the PCV valve 56 is opened,
It is not so much expected that the blow-by gas flows to the downstream side of the throttle valve 52 via the blow-by gas recirculation passage 55 due to the action of the negative pressure. Instead, at full load, the opening of the throttle valve 52 is maximized, so that the flow rate of intake air is maximized. Therefore, most of the blow-by gas generated inside the engine is guided to the intake passage 51 on the upstream side of the throttle valve 52 via the fresh air introduction passage 54 so as to be taken along by the flow. That is,
The blow-by gas flows from the upstream side to the downstream side of the throttle valve 52 together with the intake air having a large flow rate.

[0005]

However, the above-mentioned prior art has the following problems. That is, the blow-by gas contains a predetermined amount of water mainly generated by combustion. Here, in the case of partial load, the water content flows downstream of the throttle valve 52 and is introduced directly into the combustion chamber of the engine via the surge tank, so there is no problem. However, in the case of full load, as described above, most of the blow-by gas is also guided to the upstream side of the throttle valve 52 via the fresh air introduction passage 54 so as to be taken into the intake air flow. In this case, the water in the blow-by gas may adhere to the throttle valve 52 or may remain in the gap between the inner wall of the throttle body and the throttle valve 52. Therefore, there is a possibility that the above-mentioned water may be frozen during cold weather, resulting in the throttle valve 52 sticking.

On the other hand, it has been considered to heat the throttle body with warm water or the like in order to prevent freezing. However, warming the throttle body in this way deteriorates the charging efficiency of the engine, which is not desirable in terms of output performance. In addition, the provision of the above heating system has an adverse effect that the cost is likely to increase.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to prevent sticking of the throttle valve in a cold state without causing a harmful effect due to heating of the throttle body. It is to provide a blow-by gas recirculation device that can be used.

[0008]

In order to achieve the above object, in the invention according to claim 1, it is provided in the middle of an intake passage of an internal combustion engine and is introduced into a cylinder of the internal combustion engine by opening and closing. A throttle valve for adjusting the amount of intake air, a fresh air introduction passage provided so as to connect between the upstream side of the throttle valve in the intake passage and the main body of the internal combustion engine, A body of the internal combustion engine;
In a blow-by gas recirculation device comprising a blow-by gas recirculation passage provided so as to connect between the intake passage and the downstream side of the throttle valve,
A trapper means for trapping water in the blow-by gas flowing out of the body of the internal combustion engine is provided in the middle of the fresh air introduction passage, and the trapper means is communicated with at least the body of the internal combustion engine. A chamber for storing water having a first opening and a second opening communicating with the intake passage upstream of the throttle valve; and a chamber provided at the first opening, the one end of which is the chamber. A tubular member arranged to extend inside,
The gist of the present invention is that it is composed of a port provided at a predetermined distance from the opening edge at one end of the tubular member to guide the water in the blow-by gas that has passed through the tubular member to the bottom side of the chamber. There is.

According to a second aspect of the invention, in the blow-by gas recirculation device according to the first aspect, the second
The gist of the opening is that it is provided at a position higher than the first opening.

Further, in the invention according to claim 3, in the blow-by gas recirculation device according to claim 1 or 2,
The height from the opening at the tip of the port to the opening edge on the one end side of the tubular member, the ice mass formed by the water collected from the bottom of the chamber to the opening at the tip of the port The gist is that it is set to supply a sufficient amount of heat to thaw during operation.

In addition, according to the invention described in claim 4, in the blow-by gas recirculation device according to any one of claims 1 to 3, the height from the bottom of the chamber to the opening edge of the tubular member on one end side is increased. The gist is that the water accumulated in the chamber does not become higher than the opening edge on the one end side of the tubular member even if the high load operation is continued for the maximum allowable time.

In addition, in the blow-by gas recirculation apparatus according to any one of claims 1 to 4, in the invention according to claim 5, the area of the opening at the tip of the port is equal to that on the one end side of the tubular member. The gist is that the area is larger than the area of the opening edge.

In the blow-by gas recirculation apparatus according to claim 5, the gist of the invention according to claim 6 is that the opening edge on one end side of the tubular member has an orifice shape.

Further, in the invention according to claim 7, in the blow-by gas recirculation device according to any one of claims 1 to 6, a predetermined distance is provided from an opening edge on one end side of the tubular member inside the chamber. The gist of the invention is to provide a plate-shaped body at a distant position so as to face the opening edge.

In addition, according to the invention described in claim 8, in the blow-by gas recirculation apparatus according to any one of claims 1 to 7, the flow path of the blow-by gas is extended inside the chamber. The gist of the invention is to provide a distribution path extension means for promoting the storage of the water.

(Operation) According to the invention described in claim 1, the amount of intake air introduced into the cylinder of the internal combustion engine is adjusted by opening and closing the throttle valve provided in the intake passage of the internal combustion engine. To be done. According to the present invention, the negative pressure in the intake passage on the downstream side of the throttle valve becomes relatively large during partial load or the like. In this case, fresh air was introduced into the main body of the internal combustion engine from the upstream side of the throttle valve in the intake passage through the fresh air introduction passage, and the negative pressure generated in the main body of the internal combustion engine. Blow-by gas is drawn together with the fresh air, and flows through the blow-by gas recirculation passage to the downstream side of the throttle valve in the intake passage. As a result, scavenging of the body of the internal combustion engine is achieved.
Further, under full load, the negative pressure in the intake passage downstream of the throttle valve becomes relatively small. In this case,
Unlike the above, it cannot be expected that blow-by gas will flow to the downstream side of the throttle valve through the blow-by gas recirculation passage due to the action of negative pressure. Instead, the flow rate of intake air becomes large, so that blow-by gas generated inside the engine is guided to the flow and is guided to the intake passage downstream of the throttle valve via the blow-by gas recirculation passage. sell. Also, part of blow-by gas is
The air may flow backward through the fresh air introduction passage and be guided to the upstream side of the throttle valve.

However, in the present invention, the water contained in the blow-by gas flowing out from the main body of the internal combustion engine is trapped by the trapper means provided in the fresh air introduction passage. That is, the blow-by gas flowing out of the main body of the internal combustion engine flows backward through the fresh air introduction passage and is introduced into the tubular member and the chamber. Then, the water in the blow-by gas that has passed through the tubular member is guided to the bottom side of the chamber through a port provided at a predetermined distance from the opening edge at the one end side of the tubular member, and enters the chamber. Water will be stored. Therefore, even if the blow-by gas is introduced from the second opening of the chamber to the upstream side of the throttle valve, most of the water content therein is removed. Therefore, the moisture in the blow-by gas is prevented from being brought to the throttle valve, and the moisture is prevented from adhering to the throttle valve or the like and being frozen.

As described above, the blow-by gas is drawn together with the fresh air due to the negative pressure during the partial load or the like. At this time, the water stored in the chamber together with the fresh air is pulled from the opening at the tip of the port through the port and the annular member by the negative pressure. Therefore, it is possible to avoid a situation where water is cumulatively stored in the chamber and continues.

Further, according to the invention of claim 2, in addition to the function of the invention of claim 1, the second opening is provided at a position higher than the first opening. ,
It becomes difficult for water to be guided from the second opening to the downstream side of the throttle valve. Therefore, the water in the blow-by gas is easily trapped in the chamber.

Further, according to the third aspect of the present invention,
In addition to the effects of the first and second aspects of the present invention, water that has accumulated from the bottom of the chamber to the opening at the tip of the port may freeze during cold conditions such as when the engine is stopped. However, in the present invention, since the height from the opening at the tip of the port to the opening edge at the one end side of the tubular member is set to a sufficient value, for example, after restarting the engine,
The ice block formed by the freezing is thawed again with water having a predetermined amount of heat supplied to the chamber. Therefore, the problem that the stored water is frozen and the water (ice block) is not pulled at the time of partial load is solved.

In addition, according to the invention described in claim 4,
In addition to the effects of the invention described in claims 1 to 3, the height from the bottom of the chamber to the opening edge on the one end side of the tubular member is set sufficiently high within an allowable range. For this reason,
Even if the high-load operation is continued for the maximum allowable time, the water accumulated in the chamber does not become higher than the opening edge on the one end side of the tubular member. Therefore, the water accumulated in the chamber becomes higher than the opening edge on the one end side of the tubular member, and it is possible to avoid a problem that may occur when the water freezes.

In addition, according to the fifth aspect of the present invention,
In addition to the operation of the invention described in claims 1 to 4, the area of the opening at the tip of the port is larger than the area of the opening edge at the one end side of the tubular member. Therefore, when a negative pressure is generated on the downstream side of the throttle valve at the time of partial load, the water stored in the chamber becomes relatively easy to be sucked by the negative pressure. Therefore, it becomes easier to avoid the situation where the amount of stored water becomes excessive.

According to the invention described in claim 6, in addition to the operation of the invention described in claim 5, the opening edge at the one end side of the tubular member has an orifice shape. Therefore, the operation of the invention described in claim 5 can be more reliably achieved.

Further, according to the invention of claim 7,
In addition to the action of the invention according to claims 1 to 6, a plate shape is provided inside the chamber at a position spaced apart from the opening edge on one end side of the tubular member by a predetermined distance so as to face the opening edge. The body is provided. Therefore, the blow-by gas flowing out from the opening edge on the one end side of the tubular member once hits the plate-shaped body. Therefore, the water in the blow-by gas is more likely to be stored in the chamber, and the blow-by gas does not directly flow out to the upstream side of the throttle valve from the second opening. Therefore, the water in the blow-by gas is even more unlikely to flow out to the upstream side of the throttle valve.

In addition, according to the invention of claim 8,
In addition to the effects of the invention described in claims 1 to 7, a flow path extension means for extending the flow path of the blow-by gas is provided inside the chamber. Therefore, while the blow-by gas passes through the inside of the chamber, the water therein is easily liquefied, and the storage of the water is further promoted. Therefore, the water in the blow-by gas becomes even more difficult to flow to the upstream side of the throttle valve.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the blow-by gas recirculation device according to the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a schematic configuration diagram showing a blow-by gas recirculation device for an engine as an internal combustion engine mounted on a vehicle in the present embodiment. As shown in the figure, the engine 1 is provided with a cylinder head cover 2 that constitutes an engine body, and an intake passage 3 for introducing intake air into a combustion chamber (not shown) of the engine 1. The intake passage 3 is adapted to introduce fresh air through an air cleaner (not shown). A throttle valve 4 is provided in the intake passage 3. The throttle valve 4 is connected to an accelerator pedal (not shown) and is opened / closed according to the depression amount of the pedal. A surge tank 5 for absorbing intake pulsation is provided downstream of the throttle valve 4.
Is provided.

After passing through the surge tank 5, the intake air is introduced into the combustion chamber of the engine 1 via an intake manifold (not shown). In addition,
As is well known, in this combustion chamber, intake, compression,
It goes through a series of processes such as explosion (expansion) and exhaust. The engine 1 obtains a driving force by going through these series of strokes. Further, with combustion in the combustion chamber, blow-by gas may be generated in the crankcase and, in turn, in the cylinder head cover 2 that can communicate with the crankcase.

The intake passage 3 is provided with an upstream port 6 on the upstream side of the throttle valve 4 and a downstream port 7 on the downstream side of the throttle valve 4.

On the other hand, the cylinder head cover 2 has a first
Engine side port 9 and second engine side port 10
Is provided. At the first engine side port 9, P
A CV (positive crankcase ventilation) valve 12 is provided. The other port of the PCV valve 12 (the port on the side opposite to the first engine side port 9) is connected to the downstream side port 7 mainly via a blowby gas recirculation pipe 13 which constitutes a blowby gas recirculation passage. There is. The PCV valve 12 has a valve body 14
Also, the valve body 14 is provided with a coil spring 15 and is biased downward in the figure by the biasing force of the spring 15, and normally the PCV valve 12 is closed by the biasing force. On the other hand, when a negative pressure is generated in the downstream side port 7, a pressure difference is generated across the valve body 14 and the valve body 14 is pushed up against the biasing force of the coil spring 15, whereby the PCV Valve 1
Two are supposed to be opened.

The second engine side port 10 is connected to the upstream side port 6 mainly through a fresh air introduction pipe 16 which constitutes a fresh air introduction passage. in this way,
In this embodiment, the upstream port 6 and the fresh air introduction pipe 1
6 and the second engine side port 10 and the like constitute a fresh air introduction passage. In addition, the first engine side port 9, the PCV valve 12, the blow-by gas recirculation pipe 1
The blow-by gas recirculation passage is constituted by 3 and the downstream port 7.

Next, a characteristic part of this embodiment will be described. As shown in FIGS. 1 and 2, in the middle of the fresh air introduction passage, that is, the fresh air introduction pipe 16 and the upstream port 6
A trapper means 21 is provided between and. The trapper means 21 includes a first opening 22 and a second opening 2.
A box-shaped chamber 24 having a number 3, a tubular member 25 provided in the first opening 22, and a port 26 extending from the tubular member 25 toward the bottom (downward) of the chamber 24.

The first opening 22 is a fresh air introduction pipe 16
And the second opening 23 communicates with the upstream port 6. In addition, the second opening 23 is the first opening 22.
It is located at a higher position.

The tubular member 25 has a substantially cylindrical shape and is arranged so that one end side (right side in FIG. 1) thereof extends into the chamber 24. The other end of the tubular member 25 is connected to the fresh air introduction pipe 16.

On the other hand, the port 26 has a cylindrical shape similar to the tubular member 25, and extends downward from a position spaced a predetermined distance from the opening end edge 25a on one end side of the tubular member 25. .

In this embodiment, the port 26
The height (H-h) from the opening 26a at the tip of the chamber to the opening edge 25a at the one end side of the tubular member 25 is set so that the size of the chamber 24 does not become too large, and It is set so that a sufficient amount of heat is supplied to thaw an ice block formed by water accumulated from the bottom portion to the opening 26a at the tip of the port 26 during operation of the engine 1. Further, from the bottom of the chamber 24 to the opening edge 2 on the one end side of the tubular member 25.
The height (H) up to 5a is
Even if the high load operation is continued for the maximum allowable time, the water accumulated in the chamber 24 is set not to be higher than the open end edge 25a of the tubular member 25 on one end side. In addition, the port 26 is formed to have a larger diameter than the tubular member 25, and the opening area of the opening 26a of the port 26 is larger than the opening area of the opening end edge 25a of the tubular member 25 on one end side. There is.

Next, the operation and effect of this embodiment configured as described above will be described. (A) First, at the time of partial load (when the opening of the throttle valve 4 is relatively small), as shown in FIGS. 5 and 6, the negative pressure in the intake passage 3 downstream of the throttle valve 4 is relatively small. growing. In this case, as described above, the PCV valve 12 is opened by the negative pressure, and the first engine side port 9 and the downstream side port 7 are connected. For this reason,
Fresh air is introduced from the upstream side of the throttle valve 4 in the intake passage 3 through the fresh air introduction passage (fresh air introduction pipe 16 or the like) into the cylinder head cover 2 and further into the crankcase. At the same time, the negative pressure pulls the blow-by gas in the crankcase together with the fresh air, passes through the blow-by gas recirculation passage (blow-by gas recirculation pipe 13, etc.), and is located downstream of the throttle valve 4 in the intake passage 3. Spill to the side. As a result, scavenging of the body of the engine 1 is achieved.

At full load (when the throttle valve 4 is fully open), as shown in FIGS. 3 and 4, the negative pressure in the intake passage 3 downstream of the throttle valve 4 is relatively small. Become. In this case, unlike the above, it cannot be expected that the blow-by gas will flow to the downstream side of the throttle valve 4 through the blow-by gas recirculation passage due to the action of the negative pressure. Instead, since the flow rate of the intake air becomes large, the blow-by gas generated in the crankcase can be taken into the flow so as to pass through the blow-by gas recirculation passage (the blow-by gas recirculation pipe 13 etc.) and the throttle valve 4 Can be guided to the intake passage 3 on the downstream side. In addition, a part of the blow-by gas may flow back through the fresh air introduction passage and be guided to the upstream side of the throttle valve 4.

However, in the present embodiment, the trapper means 21 provided in the fresh air introduction passage traps the water in the blow-by gas. That is, the blow-by gas flows backward through the fresh air introduction passage (fresh air introduction pipe 16 or the like) and is introduced into the tubular member 25 and the chamber 24. Then, the water in the blow-by gas flowing through the tubular member 25 is guided to the bottom side of the chamber 24 via the port 26, and the water is stored in the chamber 24. Therefore, even if the blow-by gas is introduced from the second opening 23 of the chamber 24 to the upstream side of the throttle valve 4, most of the water therein is removed. Therefore, the moisture in the blow-by gas is prevented from being brought to the throttle valve 4, and the moisture is prevented from adhering to the throttle valve 4 or the like and being frozen. As a result, it is possible to prevent the throttle valve 4 from sticking without heating the throttle body.

(B) In particular, in the present embodiment, the second opening 23 is provided at a position higher than the first opening 22, so that the water content flows from the second opening 23 to the downstream side of the throttle valve 4. It will be difficult to be guided to the side. Therefore, the water in the blow-by gas is more likely to be trapped in the chamber 24. As a result, the above operation and effect can be further ensured.

(C) Further, as described above, at the time of partial load, as shown in FIGS. 5 and 6, the blow-by gas is drawn to the downstream side of the throttle valve 4 together with the fresh air due to the negative pressure. At this time, along with the fresh air, the chamber 2
The water stored in 4 is pulled by the negative pressure from the opening 26 a at the tip of the port 26 through the port 26 and the annular member 25. Therefore, it is possible to avoid a situation in which water is continuously accumulated in the chamber 24.

(D) Further, the water collected from the bottom of the chamber 24 to the opening 26a at the tip of the port 26 may be frozen during cold operation of the engine 1. However, according to the present embodiment, from the opening 26 a at the tip of the port 26 to the opening edge 2 at the one end side of the tubular member 25.
The above consideration is given to the height (H-h) up to 5a. Therefore, for example, after restarting the engine 1, the ice block formed by the above-mentioned freezing is thawed by the water having the predetermined amount of heat supplied to the chamber 24 again. As a result, the problem that the stored water freezes and the water (ice block) cannot be pulled at the time of partial load is solved. Therefore, the above (C)
The action and effect described in (1) can be made more reliable.

(E) In addition, according to the present embodiment, the height (H) from the bottom of the chamber 24 to the opening end edge 25a on the one end side of the tubular member 25 is set sufficiently high within the allowable range. ing. Therefore, even if the high load operation is continued for the maximum allowable time, the water accumulated in the chamber 24 does not become higher than the open end edge 25a of the tubular member 25 on the one end side. Therefore, the water accumulated in the chamber 24 is
It becomes higher than the opening edge 25a on the one end side of 5, and it is possible to avoid problems such as clogging that may occur when this is frozen.

(F) In addition, according to the present embodiment, the opening area of the opening 26a at the tip of the port 26 is larger than the opening area of the opening end edge 25a of the tubular member 25 on one end side. Therefore, at the time of partial load, etc., the throttle valve 4
When a negative pressure is generated on the downstream side, the water stored in the chamber 24 becomes relatively easy to be sucked by the negative pressure. Therefore, it becomes easier to avoid the situation where the amount of stored water becomes excessive.

(Second Embodiment) Next, a second embodiment of the present invention will be described. However, in the configuration of the present embodiment, members and the like equivalent to those in the above-described first embodiment are designated by the same reference numerals, and description thereof will be omitted. The following description focuses on the differences from the first embodiment.

As shown in FIG. 7, in the present embodiment, a plate 31 which constitutes a plate-like member and a distribution path extending means is provided in the chamber 24 so as to hang down from the ceiling portion. In addition, the plate 31 is a tubular member 2
5 is provided at a position separated from the opening end edge 25a on one end side by a predetermined distance so as to face the opening end edge 25a.

Further, an annular protrusion 32 is provided on the inner periphery of the opening end edge 25a on one end side of the tubular member 25, and the opening end edge 25a has an orifice shape. Next, among the operational effects of the present embodiment configured as described above, operational effects different from those of the first embodiment will be described.

First, according to the present embodiment, the tubular member 2
Since the opening edge 25a on the one end side of No. 5 has an orifice shape, the ratio of the opening area of the opening 26a at the tip of the port 26 to the opening area of the opening edge 25a is much larger. For this reason, the function and effect described in (f) above can be further ensured.

Further, according to the present embodiment, the plate 31 is provided inside the chamber 24. Therefore, the blow-by gas flowing out from the opening edge 25a on the one end side of the tubular member 25 once hits the plate 31. Therefore, the moisture in the blow-by gas is further increased in the chamber 24.
It becomes easy to be stored inside, and the blow-by gas will not directly flow out from the second opening 23 to the upstream side of the throttle valve 4. As a result, the water in the blow-by gas is even less likely to flow out to the upstream side of the throttle valve 4, and the operational effect described in (a) above becomes more reliable.

Further, due to the presence of the plate 31,
The flow path of the blow-by gas inside the chamber 24 is extended as compared with the case where there is nothing. Therefore, while the blow-by gas passes through the inside of the chamber 24, the water therein is easily liquefied, and the water storage is further promoted. Therefore, it is possible to make the water in the blow-by gas more difficult to flow out to the upstream side of the throttle valve 4.

The present invention is not limited to the above-mentioned respective embodiments, and a part of the constitution can be appropriately modified within the scope not departing from the gist of the invention and can be carried out as follows. (1) The port 26 does not necessarily have to be provided in a direction orthogonal to the bottom of the chamber 24. That is, as long as the water can be dripped or flowed down to the bottom of the chamber 24, it may extend obliquely toward the bottom, for example.

(2) A plurality of plates 31 according to the second embodiment may be provided. (3) The PCV valve 12 in the above embodiment may be omitted. Further, instead of the PCV valve 12, an orifice (not shown) may be provided.

(4) The throttle valve 4 in the above embodiment may be a mechanical type that is linked to an accelerator pedal or an electronically controlled type that is opened and closed by an actuator.

(5) The chamber 24 and the tubular member 25 in the above embodiment may be integrally formed. (6) The shapes of the chamber 24, the tubular member 25, and the port 26 in the above embodiment are not limited to those in the above embodiment. Further, the materials constituting these are not limited at all, and any material such as resin or metal may be adopted.

[0055]

As described in detail above, according to the blow-by gas recirculation device of the present invention, the sticking of the throttle valve can be prevented in the cold state without causing any adverse effect due to the heating of the throttle body. It has an excellent effect that it can be done.

[Brief description of drawings]

FIG. 1 is a sectional view showing a trapper means of a blow-by gas recirculation device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a blow-by gas recirculation device.

FIG. 3 is a sectional view showing the operation of the trapper means at full load.

FIG. 4 is a diagram showing the operation of the blow-by gas recirculation device at full load.

FIG. 5 is a cross-sectional view showing the action of the trapper means at the time of partial load.

FIG. 6 is a diagram showing an operation of the blow-by gas recirculation device under partial load.

FIG. 7 is a sectional view showing a trapper unit according to a second embodiment.

FIG. 8 is a schematic configuration diagram of a blow-by gas recirculation device in a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Cylinder head cover, 3 ... Intake passage, 4 ... Throttle valve, 12 ... PCV valve, 13 ... Blow-by gas recirculation pipe which mainly constitutes blow-by gas recirculation passage, 16 ... New which mainly constitutes fresh air introduction passage Air introduction pipe, 21 ... Trapper means, 22 ... First opening, 23 ... Second opening, 24 ... Chamber, 25 ... Tubular member, 25a ... Opening edge, 26 ... Port, 26a ... Opening, 31 ... Plate Plates that form the body and the flow path extending means, 32 ... Protrusions that form the orifice.

Claims (8)

[Claims] 1. An air conditioner provided in an intake passage of an internal combustion engine,
A throttle valve for adjusting the amount of intake air introduced into the cylinder of the internal combustion engine by opening and closing, and an upstream side of the throttle valve in the intake passage,
A fresh air introduction passage provided so as to connect to the main body of the internal combustion engine, a main body of the internal combustion engine, and a portion of the intake passage that is downstream of the throttle valve. In a blow-by gas recirculation device provided with a blow-by gas recirculation passage, a trapper means for trapping water in the blow-by gas flowing out of the body of the internal combustion engine in the middle of the fresh air introduction passage. The trapper means is provided with at least a first opening communicating with the body of the internal combustion engine and a second opening communicating with the intake passage upstream of the throttle valve. A chamber, a tubular member provided at the first opening and arranged so that one end side extends into the chamber, and a tubular member that passes through the tubular member. Blow-by gas feedback device, characterized in that the moisture in the blowby gas was formed from said tubular member one end port provided at a predetermined distance from the opening edge of the so guided to the bottom side of the chamber. 2. The second opening portion is provided at a position higher than the first opening portion.
The blow-by gas recirculation device according to 1. 3. An ice lump formed by water accumulated from the bottom of the chamber to the opening at the tip of the port at a height from the opening at the tip of the port to the opening edge at one end of the tubular member. The blow-by gas recirculation apparatus according to claim 1 or 2, wherein the blow-by gas recirculation device is set so that a sufficient amount of heat is supplied for thawing when the internal combustion engine is operating. 4. The height from the bottom of the chamber to the opening edge on one end side of the tubular member is such that the water accumulated in the chamber remains in the chamber even if high load operation is continued for a maximum allowable time. The blow-by gas recirculation device according to any one of claims 1 to 3, wherein the blow-by gas recirculation device is set so as not to be higher than an opening edge on one end side. 5. The blow-by gas according to claim 1, wherein the area of the opening at the tip of the port is made larger than the area of the opening edge at the one end side of the tubular member. Reflux device. 6. The blow-by gas recirculation apparatus according to claim 5, wherein the opening edge on the one end side of the tubular member has an orifice shape. 7. A position inside the chamber, which is separated from an opening edge of the tubular member on one end side by a predetermined distance,
The blow-by gas recirculation device according to any one of claims 1 to 6, wherein a plate-like member is provided so as to face the opening edge. 8. The flow path extension means for extending the flow path of the blow-by gas to promote the storage of the water is provided inside the chamber. The blow-by gas recirculation device according to any one of 1.