JP2011132902A - Blow-by gas reflux device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blow-by gas reflex device capable of surely preventing blow-by gas from icing effectively. <P>SOLUTION: The blow-by gas reflex device 10 includes a suction pipe 22 to allow passage of the air supplied to an engine ENG and a blow-by gas delivery pipe 21 connected with the suction pipe 22 for introducing the uncombusted gas in the engine ENG to the suction side. A radiator circulation water pipe 23 is wound round the outer peripheral surface of the blow-by gas delivery pipe 21 in the neighborhood of the connection part of the suction pipe 22 with the blow-by gas delivery pipe 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a blow-by gas recirculation device for an internal combustion engine mounted on various vehicles such as construction machines.

  Conventionally, in construction machines such as hydraulic excavators, a crankcase ventilation system (CCV: Closed Crankcase) for joining unburned gas (blow-by gas) of an engine (internal combustion engine) to the intake side and combusting it together with fuel. Ventilation System, or PCV: Positive Crankcase Ventilation System) is installed.

  In the above system, when the crankcase vent pipe is directly connected to the intake port without using the oil mist separator, the water contained in the blow-by gas is frozen in the vicinity of the connection portion to freeze. When such icing occurs, an ice layer may be stacked on the inner wall surface of the blow-by gas pipe and clog the blow-by gas pipe.

  For example, Patent Document 1 discloses an inner wall formed of a material having a low thermal conductivity and easily detaching ice at a connection portion between a blow-by gas pipe and an intake pipe in order to prevent such blow-by gas from freezing. The structure which provided the part is disclosed.

However, the conventional blow-by gas recirculation device has the following problems.
That is, in the blow-by gas recirculation device disclosed in the above publication, as a measure against freezing of blow-by gas in the vicinity of the joint, a structure having an inner wall portion that has a low thermal conductivity and easily freezes frozen ice, If used for a long period of time, there is a risk that ice that is gradually frozen will be stacked on the inner wall surface of the blow-by gas pipe, which is not sufficient as a countermeasure against freezing.

  An object of the present invention is to provide a blow-by gas recirculation device capable of preventing frosting of blow-by gas more effectively and reliably.

  The blow-by gas recirculation device according to the first invention includes an intake pipe, a blow-by gas pipe, and a heating pipe. The air supplied to the engine passes through the intake pipe. The blow-by gas pipe is connected to the intake pipe and introduces unburned gas in the engine to the intake side. The heating pipe is wound around the outer peripheral surface of the blow-by gas pipe in the vicinity of the connection portion between the intake pipe and the blow-by gas pipe.

  Here, for the purpose of improving fuel efficiency and measures for exhaust gas regulations, etc., it includes a structure near the connection part between the blow-by gas pipe and the intake pipe provided to mix unburned gas into the intake air again and burn it together with the fuel In the blow-by gas recirculation device, a heating pipe for applying heat is wound around the outer peripheral surface of the blow-by gas pipe in the vicinity of the connection portion with the intake pipe in the blow-by gas pipe.

  Here, examples of the heating pipe include a radiator circulating water pipe through which cooling water whose temperature has risen after passing through the engine flows, an electric resistance heater that generates heat when current flows.

  Accordingly, the blow-by gas pipe can be heated in the vicinity of the connection portion where the blow-by gas pipe and the intake pipe merge. Therefore, it is possible to effectively and surely prevent icing such as moisture contained in the blow-by gas flowing from the blow-by gas pipe due to the negative pressure in the intake pipe.

  The blow-by gas recirculation apparatus according to the second invention is the blow-by gas recirculation apparatus according to the first invention, and further includes a resin molded body that covers the periphery of the blow-by gas pipe around which the heating pipe is wound.

Here, the portion of the blow-by gas pipe around which the heating pipe is wound is covered with a resin molded body.
Here, the said resin molding can be shape | molded using resin moldings, such as foaming urethane, from viewpoints, such as a moldability and cost.

  Thereby, the heat generated from the heating body can be efficiently supplied to the blow-by gas piping without escaping to the outside air.

  A blowby gas recirculation device according to a third aspect of the present invention is the blowby gas recirculation device according to the second aspect of the present invention, further comprising a CCV side flange portion for connecting the blowby gas piping and the intake pipe. And the resin molding and the CCV side flange part are integrally molded.

Here, the CCV side flange portion for connecting the blow-by gas pipe and the intake pipe is formed of resin, and the above-described resin molded body and the CCV side flange portion are integrally formed.
Here, the CCV-side flange portion may be integrally formed with a resin molded body using a resin such as polyurethane from the viewpoint of moldability and cost.

  Thereby, the subsequent machining is unnecessary by integrally forming the CCV side flange portion and the resin molded body by utilizing the characteristics of the molding resin.

  A blowby gas recirculation device according to a fourth aspect of the present invention is the blowby gas recirculation device according to the second aspect of the present invention, further comprising an intake side flange portion for connecting the blowby gas piping and the intake pipe. The resin molded body and the intake side flange portion are integrally molded.

Here, the intake side flange portion for connecting the blow-by gas pipe and the intake pipe is formed of resin, and the above-described resin molded body and the intake side flange portion are integrally formed.
Here, the intake side flange portion may be integrally formed with a part of the intake pipe by using a polyolefin resin such as PP (polypropylene) from the viewpoint of moldability and cost.

  As a result, by taking advantage of the characteristics of the molded resin, the intake side flange portion and the resin molded body are integrally molded, so that subsequent machining becomes unnecessary.

  A blow-by gas recirculation device according to a fifth aspect of the present invention is the blow-by gas recirculation device according to any one of the first to fourth aspects, wherein the heating pipe is wound around the tip of the blow-by gas pipe on the intake pipe side. It has been.

Here, a heating pipe is wound around the tip of the blow-by gas pipe on the intake pipe side (downstream side).
As a result, the heating pipe is wound around the outer periphery of the blow-by gas pipe closest to the intake pipe that is likely to freeze due to the negative pressure in the intake pipe, thereby preventing the blow-by gas from freezing most effectively.

  A blow-by gas recirculation device according to a sixth invention is the blow-by gas recirculation device according to any one of the first to fifth inventions, wherein the heating pipe is fixed to the blow-by gas piping by brazing. Yes.

  Here, brazing is performed by, for example, pouring molten metal or the like as a wax into the gap between the fixed portions in the portion where the heating tube is wound around the blow-by gas piping, and fixing the heating tube to the blow-by gas piping.

Here, for brazing, for example, a metal having high thermal conductivity (silver, copper, etc.) can be melted and used.
Thereby, the heat transmitted from the heating pipe can be efficiently supplied to the blow-by gas pipe.

  A blowby gas recirculation device according to a seventh invention is the blowby gas recirculation device according to any one of the first to sixth inventions, wherein the heating pipe is a radiator circulating water pipe for circulating engine cooling water. is there.

Here, a radiator circulating water pipe that circulates the cooling water warmed through the engine is used as a heating pipe wound around the blow-by gas pipe.
Thereby, the member which exists in an engine room conventionally can be used as a heating pipe, and generation | occurrence | production of the icing in the connection part of blow-by gas piping and an intake pipe can be effectively prevented by simple structure. Moreover, since the radiator circulating water piping is wound as it is, it is not necessary to take measures against water leakage or rust.

  A blow-by gas recirculation device according to an eighth aspect of the present invention is the blow-by gas recirculation device according to any one of the first to sixth aspects, wherein the heating tube is a heater wire that generates electric resistance heat.

Here, an electric resistance heater is used as a heating tube wound around the blow-by gas piping.
Thereby, with a simple configuration, it is possible to effectively prevent icing from occurring at the connection portion between the blow-by gas pipe and the intake pipe. Further, by using an electric resistance heater, it is possible to perform flexible control such as adjusting the amount of heat generation according to the degree of freezing.

A blow-by gas recirculation device according to a ninth invention is the blow-by gas recirculation device according to the eighth invention, further comprising a glass fiber layer provided so as to cover the heater wire.
Here, when a heater wire such as a nichrome wire is used as the heating tube, a glass fiber layer covering the periphery thereof is provided.

  Thereby, for example, even when the periphery of the heating tube is covered with the above-described resin molded body, it is possible to prevent the resin portion in contact with the heater wire from being deteriorated. As a result, it is possible to maintain the heat insulation around the heater while preventing deterioration of the member in contact with the heater wire.

  According to the blow-by gas recirculation device according to the present invention, it is possible to effectively and reliably prevent icing such as moisture contained in the blow-by gas flowing from the blow-by gas pipe due to the negative pressure in the intake pipe.

The perspective view which shows the structure of the hydraulic shovel carrying the blowby gas recirculation apparatus which concerns on one Embodiment of this invention. The perspective view containing the structure in the engine room by which the blowby gas recirculation apparatus mounted in the hydraulic shovel of FIG. 1 is arrange | positioned. The expansion perspective view which shows the structure of the blowby gas recirculation apparatus periphery in the engine room of FIG. The perspective view which shows the structure of the connection part of the blowby gas piping and intake pipe which are contained in the blowby gas recirculation apparatus of FIG. Sectional drawing which shows the connection part of the blowby gas piping of FIG. 4, and an intake pipe. Sectional drawing which shows the electrical resistance heater wound around the blowby gas piping contained in the blowby gas recirculation apparatus which concerns on other embodiment of this invention.

  A hydraulic excavator (construction machine) equipped with a blow-by gas recirculation device according to an embodiment of the present invention will be described below with reference to FIGS.

[Hydraulic excavator 1]
As shown in FIG. 1, the hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, a swivel base 3, a work implement 4, a counterweight 5, a vehicle body portion 6, an equipment room 7, and a cab 8. And.

  The lower traveling body 2 moves the excavator 1 forward and backward by rotating the crawler belts P wound around the left and right end portions in the traveling direction. Moreover, the lower traveling body 2 has a swivel 3 mounted on the upper surface.

  The turntable 3 can turn in any direction with respect to the lower traveling body 2. The swivel base 3 includes a work machine 4, a counterweight 5, a vehicle body 6, a cab 8, and an engine ENG on the upper surface. Further, in the engine room EC where the engine ENG is arranged, a blowby gas recirculation device 10 described in detail later is arranged.

  The work implement 4 is configured to include a boom 11, an arm 12 attached to the tip of the boom 11, and a bucket 13 attached to the tip of the arm 12. The work machine 4 moves the boom 11, the arm 12, the bucket 13 and the like up and down by the hydraulic cylinders 11a, 12a and 13a included in a hydraulic circuit (not shown), and the earth and sand and gravel on the site of the civil engineering work. Excavation work.

  The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and hardened. The counterweight 5 has a vehicle body portion 6 on the swivel base 3 to balance the vehicle body during mining. It is provided behind.

  As shown in FIG. 1, the vehicle body 6 is disposed at a position adjacent to the counterweight 5 and has an upper opening for inspection covered by an openable engine hood 14. As shown in FIG. 2, an engine ENG, a radiator 31, a blow-by gas recirculation device 10, and the like that are power sources for driving the lower traveling body 2, the swivel 3, and the work implement 4 are disposed inside the vehicle body 6. Is housed.

The equipment room 7 is disposed behind the work machine 4 and houses a fuel tank, a hydraulic oil tank, an operation valve, and the like (not shown).
The cab 8 has an indoor space where an operator of the excavator 1 can get on and off, and is disposed on the left front side on the swivel base 3 that is on the side of the work machine 4 so that the tip of the work machine 4 can be seen. ing.

[Configuration of Blowby Gas Recirculation Device 10]
The blow-by gas recirculation device 10 of the present embodiment is a system that guides unburned gas of the engine ENG (see FIG. 2) to the intake side and burns it again with fuel. As shown in FIG. 2, the engine of the hydraulic excavator 1 It is installed in the room EC. The blow-by gas recirculation device 10 includes a blow-by gas pipe 21, an intake pipe 22, a radiator circulating water pipe (heating pipe) 23, a resin molded body 24, a CCV side flange portion 25, an intake side flange portion 26, and a brazing portion 27. I have.

  The blow-by gas pipe 21 is a metal pipe having an outer diameter of φ25 and an inner diameter of φ22, and introduces unburned gas (blow-by gas) of the engine ENG from the exhaust side of the crankcase to the intake side without discharging to the outside air. It is provided for. The blow-by gas pipe 21 directly connects the exhaust system of the engine ENG and the intake pipe 22 without using an oil mist separator or the like. Further, as shown in FIG. 3, a radiator circulating water pipe 23, a resin molded body 24, a CCV side flange portion 25, etc., which will be described later, are provided at the downstream end of the blow-by gas pipe 21.

  The intake pipe 22 takes in air compressed in the crankcase of the engine ENG from outside air and supplies it to the engine ENG. The intake pipe 22 is in a negative pressure state during operation in order to take air into the engine ENG. Further, the vicinity of the connection portion of the intake pipe 22 with the blow-by gas pipe 21 is formed of a polyolefin-based resin material such as polypropylene.

  The radiator circulating water pipe 23 is a metal pipe having an outer diameter φ10 and an inner diameter φ8, and is provided for passing cooling water circulating between the radiator 31 and the engine ENG. A part of the radiator circulating water pipe 23 (the winding part 23 c) is wound around the outer peripheral part of the blow-by gas pipe 21. In the present embodiment, as shown in FIGS. 4 and 5, the radiator circulating water pipe 23 through which the high-temperature cooling water flows immediately after passing through the engine ENG is in the vicinity of the connection with the intake pipe 22 in the blow-by gas pipe 21. It is wound around the outer periphery of. The high-temperature cooling water flowing through the engine circulating water piping 23 passing through the engine heats the vicinity of the connection portion of the blow-by gas piping 21 with the intake pipe 22 and then passes through the radiator circulating water piping 23 on the outlet side. Supplied to. Thereby, the freezing of blow-by gas resulting from the negative pressure in the intake pipe 22 can be effectively prevented. Then, the cooling water is cooled in the radiator 31 and then supplied to the engine ENG again.

Moreover, the radiator circulating water piping 23 has connection parts 23a and 23b formed as metal piping, and the winding part 23c.
The connecting portion 23a is formed on the upstream side continuously from the winding portion 23c, and is connected to the upstream side of the radiator circulating water pipe 23 through which the high-temperature cooling water immediately after passing through the engine ENG flows.

  The connecting part 23b is formed continuously downstream from the winding part 23c, and is connected to the downstream side of the radiator circulating water pipe 23 that flows the cooling water supplied with heat to the blow-by gas pipe 21 to the radiator 31. The

The winding portion 23c is wound a plurality of times (for example, triple) in the vicinity of the connection portion with the intake pipe 22 in the blow-by gas pipe 21.
Here, for the connection parts 23a, 23b and the winding part 23c included in the blow-by gas pipe 21 and the radiator circulating water pipe 23, for example, a metal pipe such as an aluminum pipe having a thermal conductivity of 50 W / m · K or more is used. It is preferable. Thereby, the heat supplied from the high-temperature cooling water flowing through the radiator circulating water pipe 23 is efficiently transmitted to the blow-by gas pipe 21 side, and the blow-by gas in the vicinity of the connection portion between the blow-by gas pipe 21 and the intake pipe 22 is transmitted. Freezing can be prevented.

  As shown in FIGS. 4 and 5, the resin molded body 24 is molded so as to cover the winding portion 23 c of the radiator circulating water pipe 23 wound around the downstream end portion of the blow-by gas pipe 21. Further, the resin molded body 24 is molded from a foamed resin such as polyurethane, and has a heat insulating property so that the temperature of the high-temperature cooling water flowing through the radiator circulating water pipe 23 does not escape as radiant heat.

  As shown in FIGS. 4 and 5, the CCV side flange portion 25 has three screw holes 25a for fixing the blow-by gas pipe 21 and the like to the intake side flange portion 26 disposed in the engine room EC. Have. In this way, by supporting the CCV side flange portion 25 at three points, the blow-by gas pipe 21 and the like can be fixed to the intake pipe 22 without rattling in the engine room EC. The CCV-side flange portion 25 is integrated with the resin molded body 24 by urethane foam resin in a state where the tip end portion of the blow-by gas piping 21 and the connection portions 23a and 23b and the winding portion 23c of the radiator circulating water piping 23 are inserted. Molded. In this way, the connection parts 23a, 23b and the winding part 23c of the blow-by gas pipe 21 and the radiator circulating water pipe 23 are inserted into a molding die, and insert molding is performed with a urethane foam resin that is inexpensive and excellent in moldability. By this, heat insulation can be improved more.

  The intake-side flange portion 26 is a member on the intake pipe 22 side connected to the CCV-side flange portion 25 described above, and as shown in FIG. 4, similar to the CCV-side flange portion 25, three screw holes 26 a are provided. Have. The blow-by gas pipe 21 can be fixed to the intake pipe 22 by inserting and fixing the bolt 32 into the screw hole 26a. The intake side flange portion 26 is integrally formed with a part of the intake pipe 22 with a resin such as polypropylene.

  As shown in FIG. 5, the brazing part 27 is formed in a gap between the outer peripheral surface of the blow-by gas pipe 21 and the winding part 23 c of the radiator circulating water pipe 23 wound in triplicate using molten metal or the like as a wax. The winding part 23c in the radiator circulating water piping 23 is fixed by pouring and hardening. In addition, as a metal used for brazing, a metal (silver, copper, etc.) with high conductivity can be used.

<Features>
As shown in FIG. 5, the blow-by gas recirculation device 10 of the present embodiment introduces an intake pipe 22 through which air supplied to the engine ENG passes and uncombusted gas in the engine ENG connected to the intake pipe 22 to the intake side. Blow-by gas piping 21. A heating pipe (a radiator circulating water pipe 23) is wound around the outer peripheral surface of the blow-by gas pipe 21 in the vicinity of the connection portion between the intake pipe 22 and the blow-by gas pipe 21.

  Here, there is a problem that the blow-by gas introduced into the intake pipe 22 easily freezes due to the negative pressure in the intake pipe 22 at the connection portion of the blow-by gas pipe 21 with the intake pipe 22.

  As a result, the cooling water that has passed through the engine ENG and has reached a high temperature is led to the downstream tip of the blow-by gas pipe 21, so that the tip of the blow-by gas pipe 21 on the downstream side in the vicinity of the joint with the intake pipe 22. Can be heated. As a result, it is possible to reliably prevent freezing of the blow-by gas introduced from the blow-by gas pipe 21 to the intake pipe 22. Therefore, it is possible to effectively and reliably prevent the blow-by gas piping 21 from being clogged with a layer in which the blow-by gas is frozen on the inner peripheral surface of the blow-by gas piping 21.

  Further, since the radiator circulating water pipe 23 is wound around the outer peripheral surface of the blow-by gas pipe 21 as it is, it is not necessary to take measures against water leakage at the winding portion 23 c of the blow-by gas pipe 21. Therefore, a configuration necessary for countermeasures against water leakage can be omitted, and countermeasures against rust caused by water leakage are not necessary.

  In addition, by using the radiator circulating water pipe 23 as a heating pipe for heating the outer peripheral surface of the blow-by gas pipe 21, it is possible to effectively remove the blow-by gas simply by arranging a high-temperature pipe existing in the engine room EC. Freezing can be prevented.

  Further, by covering the heated portion of the blow-by gas pipe 21 around which the radiator circulating water pipe 23 is wound together with the wound portion 23c with the resin molded body 24, radiation heat is prevented from being diffused, and immediately after passing through the engine ENG. Heat can be efficiently transferred from the winding portion 23c of the radiator circulating water pipe 23 through which the high-temperature cooling water flows to a predetermined position of the blow-by gas pipe 21.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, the example which used the radiator circulating water piping 23 which circulates cooling water between the radiator 31 and the engine ENG as a heating pipe wound around the blowby gas piping 21 was demonstrated and demonstrated. However, the present invention is not limited to this.

  For example, instead of the radiator circulating water pipe, an electric resistance heater (heating pipe) 123 such as a nichrome wire for generating electric resistance heat may be wound around the blow-by gas pipe 21 as shown in FIG. Even in this case, it is possible to obtain the same effect as the configuration of the above-described embodiment in which the radiator circulating water pipe is wound.

  Further, when the electric resistance heater is used as the heating tube, as shown in FIG. 6, a thickness 2 including glass mat, glass fiber, etc. is used to suppress deterioration of the resin that comes into contact with the heater portion such as nichrome wire. More preferably, the electric resistance heater and the blow-by gas pipe are integrally formed with a glass fiber layer 125 of ˜3 mm in between.

  Further, by using the electric resistance heater 123 as the heating pipe, the amount of heat applied to the blow-by gas pipe 21 can be controlled according to various conditions such as the degree of freezing in the blow-by gas pipe 21 and the outside air temperature. it can. In this case, it is more preferable to provide a temperature sensor that measures the surface temperature of the blow-by gas pipe 21. Thereby, according to the detection result in a temperature sensor, appropriate heat quantity can be provided with respect to the blow-by gas piping 21 from the electrical resistance heater 123. FIG.

Further, when an electric resistance heater is used, it is possible to effectively prevent icing such as moisture contained in the blow-by gas even before the engine is warmed.
Alternatively, the radiator circulating water pipe and the electric resistance heater are used together, the electric resistance heater is turned on until the engine is warmed, and after the engine is warmed, the electric resistance heater is turned off, and the high-temperature cooling water flowing through the radiator circulating water pipe May be used to prevent blow-by gas from freezing.

  Furthermore, a heat pipe or the like can be used as the heating tube.

(B)
In the said embodiment, as shown in FIG. 5, the radiator circulating water piping (heating tube) 23 was wound around the outer peripheral surface of the blow-by gas piping 21, and it demonstrated and demonstrated the example wound 3 times in the winding part 23c. However, the present invention is not limited to this.

  For example, it is preferable to increase the number of windings or make multiple windings, etc., so that the heating tube can reliably provide the amount of heat necessary for preventing freezing.

(C)
In the said embodiment, the structure which heats the front-end | tip part as much as possible in the blowby gas piping 21 as an example was demonstrated as a position of the blowby gas piping 21 heated with a heating pipe (radiator circulating water piping 23) as an example. However, the present invention is not limited to this.

For example, the structure which heats the position more upstream of blow-by gas piping by a heating pipe may be sufficient.
However, considering that the blow-by gas freezes due to the negative pressure in the intake pipe 22, in order to prevent the blow-by gas from freezing more reliably, a portion as close to the intake pipe 22 as possible is used as in the above embodiment. It is desirable to heat.

(D)
In the said embodiment, as shown in FIG. 5, the example which fixed the winding part 23c of the radiator circulating water piping (heating pipe) 23 to the outer peripheral surface of the blowby gas piping 21 by brazing was demonstrated. However, the present invention is not limited to this.

  For example, in addition to brazing, other fixing means with high thermal conductivity capable of efficiently transferring the heat of the heating tube to the blow-by gas piping side, such as welding, may be employed.

(E)
In the said embodiment, the example which shape | molded the resin molding 24 using the foaming polyurethane was given and demonstrated. However, the present invention is not limited to this.

For example, in addition to the foamed polyurethane, the resin molded body may be molded with other resin.
However, from the viewpoint of being able to use a small molding die, inexpensive and good moldability, it is desirable to mold the resin molded body using the above-described resin such as urethane foam.

(F)
In the above embodiment, an example in which the present invention is applied to the crankcase ventilation system of an engine (internal combustion engine) mounted on the hydraulic excavator 1 has been described. However, the present invention is not limited to this.

  For example, the present invention may be applied to a crankcase ventilation system of an internal combustion machine mounted on a construction machine other than a hydraulic excavator, an automobile, a work vehicle, an agricultural vehicle, or the like.

  The blow-by gas recirculation device of the present invention has the effect that it can effectively and surely prevent icing such as moisture contained in the blow-by gas flowing in from the blow-by gas pipe due to the negative pressure in the intake pipe. It can be widely applied not only to machines but also to various vehicles.

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Swivel stand 4 Working machine 5 Counterweight 6 Car body part 7 Equipment room 8 Cab 10 Blow-by gas recirculation apparatus 11 Boom 11a Hydraulic cylinder 12 Arm 12a Hydraulic cylinder 13 Bucket 13a Hydraulic cylinder 14 Engine hood 21 Blow-by gas piping 22 Intake Tube 23 Radiator circulating water piping (heating tube)
23a, 23b Connecting portion 23c Winding portion 24 Resin molded body 25 CCV side flange portion 25a Screw hole 26 Intake side flange portion 26a Screw hole 27 Brazing portion 31 Radiator 32 Bolt 123 Electric resistance heater (heating tube)
125 Glass fiber layer EC engine room ENG engine

JP-A-8-246837 (published September 24, 1996)

Claims (9)

An intake pipe through which air supplied to the engine passes,
A blow-by gas pipe connected to the intake pipe for introducing unburned gas in the engine to the intake side;
A heating pipe wound around an outer peripheral surface of the blow-by gas pipe in the vicinity of a connection portion between the intake pipe and the blow-by gas pipe;
A blow-by gas recirculation device. A resin molded body covering the periphery of the blow-by gas pipe around which the heating pipe is wound,
In addition,
The blowby gas recirculation apparatus according to claim 1. A CCV-side flange portion for connecting the blow-by gas pipe and the intake pipe;
The resin molded body and the CCV side flange portion are integrally molded,
The blow-by gas recirculation apparatus according to claim 2. An intake-side flange portion for connecting the blow-by gas pipe and the intake pipe;
The intake pipe and the intake side flange portion are formed integrally.
The blow-by gas recirculation apparatus according to claim 2. The heating pipe is wound around a tip of the blow-by gas pipe on the intake pipe side,
The blowby gas recirculation apparatus according to any one of claims 1 to 4. The heating pipe is fixed to the blow-by gas pipe by brazing,
The blow-by gas recirculation apparatus according to any one of claims 1 to 5. The heating pipe is a radiator circulating water pipe for circulating cooling water of the engine.
The blowby gas recirculation device according to any one of claims 1 to 6. The heating tube is a heater wire that generates electric resistance heat.
The blowby gas recirculation device according to any one of claims 1 to 6. A glass fiber layer provided to cover the heater wire;
The blowby gas recirculation apparatus according to claim 8.

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