JP2022104113A - Blow-by gas treatment device - Google Patents

Abstract

To provide a blow-by gas treatment device capable of suppressing freezing of condensate water even in an environment where the atmospheric temperature is low.SOLUTION: A blow-by gas treatment device 100 is for an internal combustion engine 1 including an engine body 2 formed by casting using a core, a casting removal hole 10 for removing sand-like substance used as a core formed inside an outer wall portion 11 of the engine body 2, and a sealing member 20 for sealing the casting removal hole 10. The blow-by gas treatment device 100 includes a blow-by gas passage 30 disposed outside the engine body 2, and a heating member 31 forming a part of the blow-by gas passage 30 and connected to the sealing member 20 so as to allow heat transmission.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to blow-by gas processing equipment.

In an internal combustion engine, a blow-by gas processing device that releases blow-by gas leaking into a crankcase from a gap between a piston and a cylinder to the atmosphere, for example, from a blow-by gas passage is known.

Japanese Unexamined Patent Publication No. 2016-18364

However, in the above blow-by gas processing apparatus, the blow-by gas passage arranged outside is cooled by the outside air in an environment where the atmospheric temperature is low. Therefore, in the blow-by gas passage, the temperature of the blow-by gas may be lowered and condensed water may be generated as the blow-by gas moves from the upstream side to the downstream side.

Further, at the downstream end of the blow-by gas passage, there is a problem that the condensed water freezes and causes blockage.

Therefore, the present disclosure has been devised in view of such circumstances, and an object thereof is to provide a blow-by gas treatment apparatus capable of suppressing freezing of condensed water even in an environment where the atmospheric temperature is low.

According to one aspect of the present disclosure, it is a blow-by gas processing apparatus for an internal combustion engine, wherein the internal combustion engine is formed on an engine body formed by casting using a core and an outer wall portion of the engine body. A casting hole for removing the sand-like material used for the core from the inside of the engine body after casting, and a sealing member inserted into the casting hole to seal the casting hole. The blow-by gas processing apparatus is provided with a blow-by gas passage arranged outside the engine body, and a heating member that forms a part of the blow-by gas passage and is heat transferably connected to the sealing member. And, a blow-by gas processing apparatus characterized by comprising.

Preferably, the heating member is formed by a lid attached to the sealing member and defining a heating chamber together with the sealing member.

Further, the sealing member includes heat radiation fins protruding into the heating chamber.

Further, the heating member is formed by a pipe portion that defines a heating chamber.

Further, a heat transfer member for connecting the sealing member and the pipe portion is further provided.

According to the present disclosure, it is possible to suppress freezing of condensed water even in an environment where the atmospheric temperature is low.

It is a schematic top view which shows the whole structure of the internal combustion engine of 1st Embodiment. It is a schematic rear view which shows the blow-by gas processing apparatus of 1st Embodiment. It is a schematic perspective exploded view which shows a cast hole and a sealing member. It is an enlarged sectional view of the left side view of the blow-by gas processing apparatus at the position of the IV-IV line shown in FIG. It is an enlarged sectional view of the rear view of the blow-by gas processing apparatus at the position of the VV line shown in FIG. It is an enlarged sectional view of the left side view of the blow-by gas processing apparatus of 2nd Embodiment. It is an enlarged sectional view of the rear view of the blow-by gas processing apparatus at the position of the line VII-VII shown in FIG. It is an enlarged sectional view of the left side view of the blow-by gas processing apparatus of the 1st modification. FIG. 8 is an enlarged cross-sectional view of the rear view of the blow-by gas processing apparatus at the position of the IX-IX line shown in FIG. It is a schematic top view which shows the whole structure of the internal combustion engine of the 2nd modification.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the present disclosure is not limited to the following embodiments.

(First Embodiment)
First, the overall configuration of the internal combustion engine 1 of the first embodiment will be described with reference to FIGS. 1 and 2. In the figure, the white arrow A indicates the flow of intake air, the black arrow G indicates the flow of exhaust gas, and the shaded arrow B indicates the flow of blow-by gas. Further, each direction of up, down, front, back, left, and right shown in the figure coincides with each direction of the vehicle (not shown) equipped with the internal combustion engine 1, although it is only defined for convenience of explanation.

As shown in FIG. 1, the internal combustion engine 1 is a multi-cylinder compression ignition type internal combustion engine mounted on a vehicle, for example, a 4-cylinder diesel engine. The vehicle is a large vehicle such as a truck. However, the type, type, application, etc. of the vehicle and the internal combustion engine 1 are not particularly limited. For example, the vehicle may be a small vehicle such as a passenger car, and the internal combustion engine 1 is a spark ignition type internal combustion engine such as a gasoline engine. It may be. Further, the internal combustion engine 1 may be mounted on a moving body other than a vehicle, for example, a ship, a construction machine, or an industrial machine. Further, the internal combustion engine 1 does not have to be mounted on a moving body, and may be a stationary type.

The internal combustion engine 1 includes an engine main body 2, an intake passage 3, an exhaust passage 4, and a turbocharger 5.

As shown in FIG. 2, the engine main body 2 includes a cylinder block 2a, a cylinder head 2b connected to the upper part of the cylinder block 2a, and a crankcase 2c integrally formed in the lower part of the cylinder block 2a.

Although not shown, the cylinder block 2a is provided with a plurality of cylinders, and the cylinders accommodate pistons. A valve operating mechanism such as a camshaft is attached to the cylinder head 2b, and a head cover 2d is connected to the upper portion of the cylinder head 2b. A crankshaft is housed in the crankcase 2c, and an oil pan is connected to the lower part of the crankcase 2c.

Further, as shown in FIG. 1, the engine main body 2 includes a gear chamber 2e for accommodating a plurality of gears (not shown) for transmitting power from a crankshaft to a camshaft, and a water jacket 2f through which engine cooling water is circulated. , Equipped with.

The gear chamber 2e is formed so as to penetrate in the vertical direction inside the rear end portions of the cylinder head 2b, the cylinder block 2a, and the crankcase 2c (see FIG. 2). The water jacket 2f is formed inside the cylinder block 2a and the cylinder head 2b.

The intake passage 3 includes an intake manifold 3a connected to the cylinder head 2b and an intake pipe 3b connected to the upstream end of the intake manifold.

The intake manifold 3a distributes and supplies the intake air A sent from the intake pipe 3b to the intake ports of each cylinder.

The intake pipe 3b is provided with an air cleaner 3c, a turbocharger 5 compressor 5C, and an intercooler 3d in this order from the upstream side.

The exhaust passage 4 includes an exhaust manifold 4a connected to the cylinder head 2b and an exhaust pipe 4b arranged on the downstream side of the exhaust manifold 4a.

The exhaust manifold 4a collects the exhaust G sent from the exhaust port of each cylinder. A turbine 5T of the turbocharger 5 is provided between the exhaust manifold 4a and the exhaust pipe 4b.

Next, with reference to FIGS. 1 to 4, the cast hole 10 of the first embodiment and the sealing member 20 for sealing the cast hole 10 will be described. In FIG. 4, the alternate long and short dash line C1 indicates a common central axis of the cast hole 10 and the sealing member 20.

Although not shown, the engine body 2 is formed by casting using a core. That is, the cylinder head 2b, the cylinder block 2a, and the crankcase 2c are each cast using a mold. The mold is provided with a core for forming a cavity such as a gear chamber 2e and a water jacket 2f inside them.

The core is formed of sand, is broken inside the engine body 2 after casting, and is pulled out from the inside of the engine body 2. The core may be formed of any sandy substance, and may be formed of, for example, lime or salt.

As shown in FIG. 1, the internal combustion engine 1 has a cast hole 10 for removing sand used for a core from the inside of the engine body 2 after casting, and a cast hole 10 inserted into the cast hole 10. A sealing member 20 for sealing is provided.

The cast hole 10 is formed in the outer wall portion 11 of the engine main body 2. Specifically, the cast holes 10 are formed in the rear wall portion 12 and the front wall portion 13 of the cylinder head 2b, respectively. The cast hole 10A of the rear wall portion 12 is formed in the central portion of the rear wall portion 12 and communicates the outside of the cylinder head 2b with the gear chamber 2e. On the other hand, the cast hole 10B of the front wall portion 13 is formed in the central portion of the front wall portion 13 and communicates the outside of the cylinder head 2b with the water jacket 2f. The cast holes 10A and 10B have similar shapes to each other.

A plurality of sealing members 20 (two in the illustrated example) are provided, and the cast holes 10A and 10B are sealed, respectively, to form a part of the cylinder head 2b. In the first embodiment, the sealing member 20 for the cast hole 10A of the rear wall portion 12 will be described. However, the configuration of the sealing member 20 is the same for the cast hole 10B of the front wall portion 13.

As shown in FIG. 3, the cast hole 10A of the rear wall portion 12 (hereinafter, simply referred to as “cast hole 10”) is formed in a round hole shape, and the rear wall portion 12 is formed in the thickness direction (front-back direction). It is formed through.

The sealing member 20 is formed by a bottomed cylindrical sealing cup and is coaxially attached to the cast hole 10. The opening-side end (rear end) 20a of the sealing member 20 is directed toward the outside (rear) of the cylinder head 2b. Further, the sealing member 20 is made of a metal material.

As shown by an arrow P in FIG. 3, the sealing member 20 is press-fitted into the cast hole 10 by, for example, an operator pushing the rear end portion 20a toward the inside (front) of the cylinder head 2b. ..

As shown in FIG. 4, the sealing member 20 has the same axial length L1 as the cast hole 10. The outer peripheral surface 20b of the sealing member 20 is in close contact with the entire inner peripheral surface of the cast hole 10.

A boss portion 12a is formed on the rear wall portion 12 around the cast hole 10. The boss portion 12a is formed by projecting the rear wall portion 12 forward and backward. As a result, a sufficient contact area between the outer peripheral surface 20b of the sealing member 20 and the inner peripheral surface of the cast hole 10 can be sufficiently secured. As a result, the cast hole 10 can be reliably sealed by the sealing member 20.

Next, the blow-by gas processing apparatus 100 of the first embodiment will be described. As is well known, blow-by gas is gas that leaks into the crankcase from the gap between the cylinder and the piston.

As shown in FIG. 2, an in-engine passage 6 through which blow-by gas B flows is formed inside the engine body 2. The in-engine passage 6 passes through the inside of the cylinder block 2a and the cylinder head 2b from the inside of the crankcase 2c, and extends in the vertical direction into the head cover 2d. The gas outlet 6a of the engine passage 6 is formed on the upper surface of the head cover 2d.

An oil separator 7 for removing the oil in the blow-by gas B is provided on the upper surface of the head cover 2d. The gas inlet 7a of the oil separator 7 is connected to the gas outlet 6a of the engine passage 6 via the inlet pipe 7b. On the other hand, the upstream end of the upstream side pipe 32 of the blow-by gas passage 30, which will be described later, is connected to the gas outlet 7c of the oil separator 7.

In the oil separator 7, oil is separated from the blow-by gas B introduced therein. The oil separated from the blow-by gas B is returned into the crankcase 2c through a return passage (not shown).

The blow-by gas processing device 100 of the first embodiment includes a blow-by gas passage 30 arranged outside the engine main body 2 and a heating member 31 that defines a part of the blow-by gas passage 30. The heating member 31 is connected to the sealing member 20 so as to be heat transferable.

The heating member 31 of the first embodiment is formed by a lid 40 attached to the sealing member 20. The lid 40 defines a heating chamber 31A, which will be described later, together with the sealing member 20.

The lid 40 of the first embodiment has a lid main body 41 connected to the sealing member 20, an introduction port 42 formed in the lid main body 41 for introducing blow-by gas B, and a blow-by gas B formed in the lid main body 41. A discharge port 43 for discharging the water is provided.

Further, the blow-by gas passage 30 includes an upstream side pipe 32 connected to the introduction port 42 of the lid 40 and a downstream side pipe 33 connected to the discharge port 43 of the lid 40. The upstream side pipe 32 and the downstream side pipe 33 are made of a resin material such as rubber.

The upstream side pipe 32 extends rearward from the gas outlet 7c of the oil separator 7 along the upper surface portion of the head cover 2d, is bent downward, and extends downward along the right rear wall of the head cover 2d and the cylinder head 2b. , Bent to the left and connected to the inlet 42 of the lid 40.

The downstream pipe 33 extends diagonally downward to the left along the rear wall on the left side of the cylinder block 2a from the discharge port 43 of the lid 40, and then is bent downward to be released to the atmosphere at a position rearward to the left of the crankcase 2c. Cylinder.

As shown in FIGS. 4 and 5, the lid 40 is made of a metal material so that heat can be easily transferred from the sealing member 20. However, the lid 40 may be made of any material, and may be made of, for example, a resin material.

The lid main body 41 is formed in a bottomed cylindrical shape, has a bottom portion 41a and a side wall portion 41b, and is coaxially attached to the sealing member 20. The opening side end portion (front end portion) 41c of the lid main body 41 is directed toward the front and is press-fitted into the rear end portion 20a of the sealing member 20.

Specifically, a reduced diameter portion 41d having a reduced outer diameter is formed at the front end portion 41c of the lid main body 41. The reduced diameter portion 41d is a notch groove in which an outer peripheral portion is cut out from the front end of the side wall portion 41b toward the rear. The reduced diameter portion 41d is formed in a square cross section, the front end is opened, and the groove wall surface 41e is formed at the rear end. In the first embodiment, the reduced diameter portion 41d is press-fitted into the rear end portion 20a of the sealing member 20, and the groove wall surface 41e of the reduced diameter portion 41d is brought into close contact with the rear end surface of the sealing member 20. Further, the outer peripheral surface 41f of the lid main body 41 has the same outer diameter so as to be flush with the outer peripheral surface 20b of the sealing member 20. In this way, the sealing member 20 and the opening-side end portions of the lid main body 41 are fitted to each other like an in-row fitting, and are airtightly and firmly fixed to each other. However, the method of attaching the lid main body 41 may be arbitrary, and may be attached using, for example, a fastening member such as a bolt.

A heating chamber 31A for heating the blow-by gas B is formed inside the lid main body 41 and the sealing member 20. The heating chamber 31A has a flow path cross-sectional area larger than the flow path cross-sectional area of the introduction port 42 and the discharge port 43. As a result, the flow velocity of the blow-by gas B can be reduced in the heating chamber 31A, and the heating time of the blow-by gas B can be lengthened. As a result, the blow-by gas B can be sufficiently heated.

The introduction port 42 and the discharge port 43 are each formed on the side wall portion 41b located immediately after the diameter reduction portion 41d. Further, the introduction port 42 and the discharge port 43 are formed in a tubular shape protruding outward in the radial direction of the lid main body 41 from the side wall portion 41b.

The introduction port 42 is fitted and fixed to the downstream end of the upstream side pipe 32 from the inside. On the other hand, the discharge port 43 is fitted and fixed to the upstream end of the downstream side pipe 33 from the inside.

Further, the introduction port 42 and the discharge port 43 are arranged at positions symmetrical with respect to the central axis C1 of the lid main body 41, and have a central axis C2 common to each other. In the first embodiment, the introduction port 42 is formed at the right end portion of the side wall portion 41b, and the discharge port 43 is formed at the left end portion of the side wall portion 41b.

Further, the introduction port 42 and the discharge port 43 are smoothly connected to the side wall portion 41b by increasing the inner and outer diameters toward the inner side in the radial direction of the lid main body 41. As a result, in the lid main body 41, the blow-by gas B can be smoothly introduced from the introduction port 42, and the blow-by gas B can be smoothly discharged from the discharge port 43.

The side wall portion 41b located behind the reduced diameter portion 41d has a minimum length L2 capable of forming the introduction port 42 and the discharge port 43 in the axial direction of the lid main body 41. This effect will be described later.

As shown in FIG. 2, in the first embodiment, while the internal combustion engine 1 is in operation, the blow-by gas B in the crankcase 2c flows through the engine passage 6, the oil separator 7, and the upstream pipe 32 in this order, and is introduced. It is introduced from the mouth 42 into the heating chamber 31A inside the lid 40 and the sealing member 20. The blow-by gas B introduced into the heating chamber 31A is discharged from the discharge port 43 to the downstream side pipe 33, and is released to the atmosphere from the downstream end of the downstream side pipe 33.

By the way, in an environment where the atmospheric temperature is low, the upstream side pipe 32 and the downstream side pipe 33 are cooled by the outside air. Therefore, inside these pipes 32 and 33, the temperature of the blow-by gas B is lowered as the blow-by gas B moves from the upstream side to the downstream side, and condensed water is generated when the temperature becomes lower than the dew point temperature. In particular, at the downstream end of the downstream side pipe 33, the blow-by gas B is directly cooled by the outside air, so that the temperature of the blow-by gas B tends to decrease.

On the other hand, in the cylinder head 2b, the inside of the gear chamber 2e is heated, and the bottom 21 of the sealing member 20 receives this heat over a wide area, so that the sealing member 20 and the lid 40 are heated, and the inside of the heating chamber 31A is heated. It gets hot. Therefore, in the heating chamber 31A, the blow-by gas B introduced from the upstream side pipe 32 is heated, and the heated blow-by gas B can be discharged to the downstream side pipe 33.

As a result, even in an environment where the atmospheric temperature is low, it is possible to prevent the condensed water from freezing at the downstream end of the downstream side pipe 33 and causing the condensed water to freeze and cause clogging.

Therefore, with the blow-by gas treatment device 100 of the first embodiment, it is possible to suppress freezing of the condensed water even in an environment where the atmospheric temperature is low. Since the conventional general blow-by gas treatment device does not have a heating member, the condensed water may freeze at the downstream end of the blow-by gas passage in an environment where the atmospheric temperature is low, causing blockage. ..

Further, as shown in FIG. 4, the sealing member 20 of the first embodiment is formed by a bottomed cylindrical sealing cup having an open rear end portion 20a. Therefore, the heating chamber 31A can be easily formed by attaching the lid 40 to the sealing member 20. Further, the heat trapped inside the sealing member 20 can be easily transferred to the blow-by gas B.

Further, in the first embodiment, the side wall portion 41b of the lid 40 located behind the reduced diameter portion 41d has a minimum length capable of forming the introduction port 42 and the discharge port 43 in the axial direction of the lid main body 41. Has L2. Therefore, since it is possible to prevent the lid 40 from protruding rearward from the sealing member 20, it is possible to prevent the lid 40 from being cooled by the outside air and the heating chamber 31A from being cooled.

Further, in the first embodiment, the blow-by gas B can be heated by using the sealing member 20 which has no use other than sealing the cast hole 10 as it is. Therefore, for example, it is not necessary to provide a heating device such as an electric heater in the blow-by gas passage 30, and the number of parts and the production cost can be suppressed.

(Second Embodiment)
As shown in FIGS. 6 and 7, in the blow-by gas treatment apparatus 200 of the second embodiment, the configuration of the heating member 31 is different from that of the first embodiment. Since other configurations are the same as those of the first embodiment, the same reference numerals are used for the same components in the following description, and detailed description thereof will be omitted.

As shown in FIG. 6, the heating member 31 of the second embodiment is formed not by the lid 40 described in the first embodiment but by the pipe portion 50 defining the heating chamber 31A.

Further, the blow-by gas treatment device 200 of the second embodiment further includes a heat transfer member 60 for connecting the sealing member 20 and the pipe portion 50.

The tube portion 50 and the heat transfer member 60 are made of a metal material so that heat can be easily transferred from the sealing member 20. However, the pipe portion 50 and the heat transfer member 60 may be made of a resin material.

The heat transfer member 60 is integrally formed by being welded to the sealing member 20 and the pipe portion 50. However, the heat transfer member 60 may be attached to the sealing member 20 and the pipe portion 50 by using a fastening member such as a bolt.

The tube portion 50 of the second embodiment is formed in a circular tubular shape, and is arranged so as to extend in the radial direction of the sealing member 20 at a position immediately after the sealing member 20. In FIG. 6, reference numeral C3 indicates the central axis of the pipe portion 50.

As shown in FIG. 7, the pipe portion 50 of the second embodiment extends linearly from the right side to the left side along the flow direction of the blow-by gas B, and connects the upstream side pipe 32 and the downstream side pipe 33.

At the central position in the axial direction of the pipe portion 50, an enlarged diameter portion 51 having an inner diameter and an outer diameter larger than that of the upstream side end portion 52 and the downstream side end portion 53 is formed. As a result, the flow velocity of the blow-by gas B can be reduced in the enlarged diameter portion 51, and the heating time of the blow-by gas B can be lengthened. As a result, the blow-by gas B can be sufficiently heated.

The enlarged diameter portion 51 of the second embodiment is arranged from the right end portion to the left end portion of the sealing member 20 in the left-right direction.

Further, the enlarged diameter portion 51 has an outer diameter D2 smaller than the inner diameter D1 of the sealing member 20. As a result, when the sealing member 20 is press-fitted into the punching hole 10, the upper end portion and the lower end portion of the rear end portion 20a not covered by the enlarged diameter portion 51 can be pushed forward.

The upstream end 52 of the pipe 50 is fitted and fixed to the downstream end of the upstream pipe 32 from the inside. On the other hand, the downstream end portion 53 is fitted and fixed to the upstream end of the downstream side pipe 33 from the inside.

The upstream side end portion 52 and the downstream side end portion 53 are smoothly connected to the enlarged diameter portion 51 by increasing the inner diameter and the outer diameter toward the inner side in the axial direction of the pipe portion 50. As a result, in the enlarged diameter portion 51, the blow-by gas B can be smoothly introduced from the upstream end portion 52, and the blow-by gas B can be smoothly discharged from the downstream end portion 53.

The heat transfer member 60 is formed in a plate shape, extends axially rearward from the bottom portion 21 of the sealing member 20, and is connected to the outer peripheral surface of the front end portion of the enlarged diameter portion 51 of the pipe portion 50.

Further, the heat transfer member 60 extends in the left-right direction along the central axis C3 of the pipe portion 50. The left and right end faces 61 and 62 of the heat transfer member 60 are connected to the inner peripheral surfaces of the left and right side ends of the facing sealing member 20. Further, the rear end surface 63 of the heat transfer member 60 is connected to the outer peripheral surface of the front end portion of the diameter expansion portion 51 over the entire length in the axial direction of the diameter expansion portion 1.

In the second embodiment, during the operation of the internal combustion engine 1, the blow-by gas B is introduced into the pipe portion 50 from the upstream side pipe 32, flows downstream in the pipe portion 50, and is discharged to the downstream side pipe 33. At this time, in the cylinder head 2b, the inside of the gear chamber 2e is heated, and the sealing member 20 is heated by this heat. Then, the heat of the heated sealing member 20 is transferred to the enlarged diameter portion 51 of the pipe portion 50 through the heat transfer member 60, so that the temperature inside the heating chamber 31A becomes high. As a result, in the heating chamber 31A, the blow-by gas B introduced from the upstream side pipe 32 is heated, and the heated blow-by gas B can be discharged to the downstream side pipe 33.

As a result, even in an environment where the atmospheric temperature is low, it is possible to prevent the condensed water from freezing at the downstream end of the downstream side pipe 33 and causing the condensed water to freeze and cause clogging.

Therefore, with the blow-by gas treatment device 200 of the second embodiment, it is possible to suppress freezing of the condensed water even in an environment where the atmospheric temperature is low.

On the other hand, the above embodiment can be a modification or a combination thereof as follows.

(First modification)
As shown in FIG. 8, the sealing member 20 described in the first embodiment includes heat radiation fins 70 protruding into the heating chamber 31A.

The heat radiation fin 70 is formed of a thin metal plate and extends axially rearward from the bottom portion 21 of the sealing member 20 toward the bottom portion 41a of the lid main body 41. The front end portion 71 of the heat radiation fin 70 is welded and fixed to the bottom portion 21 of the sealing member 20. On the other hand, the rear end portion 72 of the heat radiation fin 70 is arranged close to the bottom portion 41a of the lid main body 41.

Further, as shown in FIGS. 8 and 9, the heat radiation fins 70 are arranged so as to extend from the introduction port 42 side (right side) of the lid 40 to the discharge port 43 side (left side). Further, the heat radiation fins 70 are spaced apart in a direction (vertical direction) orthogonal to the central axis C1 of the lid main body 41 and the central axis C2 of the introduction port 42 and the discharge port 43, and a plurality of them (in the illustrated example, at equal intervals). 5 sheets) will be provided.

According to the first modification, the heat of the heated sealing member 20 can be radiated from the heat radiating fin 70. As a result, the contact area with the blow-by gas B can be increased and the blow-by gas B can be efficiently heated as compared with the sealing member 20 of the first embodiment not provided with the heat radiation fins 70.

(Second modification)
As shown in FIG. 10, the downstream end of the downstream side pipe 33 of the second modification is connected to the intake pipe 3b located between the air cleaner 3c and the compressor 5C. That is, the blow-by gas processing device 100 of the second modification is a blow-by gas recirculation device that recirculates the blow-by gas B from the downstream side pipe 33 to the intake pipe 3b.

In the second modification, the blow-by gas B heated in the heating chamber 31A is discharged to the downstream side pipe 33, so that the condensed water freezes inside the intake pipe 3b at the downstream end of the downstream side pipe 33 and its vicinity. Can be suppressed. Since the conventional general blow-by gas recirculation device does not have a heating member, frozen ice may flow to the downstream side and damage the compressor 5C.

(Third modification example)
Although not shown, the heating member 31 may have any configuration as long as it is connected to the sealing member 20 so as to be heat transferable.

In the blow-by gas passage of the third modification, the lid 40 described in the first embodiment is omitted, and the upstream side pipe 32 and the downstream side pipe 33 are integrally formed. Then, at least a part of at least one of the upstream side pipe 32 and the downstream side pipe 33 is connected to the sealing member 20 as a heating member.

(Fourth modification)
The blow-by gas treatment device 200 described in the second embodiment does not have to include the heat transfer member 60. That is, in the fourth modification, the pipe portion 50 is directly connected to the sealing member 20.

(Fifth modification)
The lid 40 described in the first embodiment and the pipe portion 50 and the heat transfer member 60 described in the second embodiment may have any shape. For example, the lid of the fifth modification is formed in a disk shape and is attached to the rear end portion 20a of the sealing member 20 by using a fastening member such as a bolt.

(6th modification)
The heating member 31 may be connected to the sealing member 20 for the cast hole 10B of the front wall portion 13 of the cylinder head 2b shown in FIG. 1 so as to be heat transferable.

Although not shown, for example, in the sixth modification, the lid 40 described in the first embodiment is attached to the sealing member 20 of the front wall portion 13 and defines a heating chamber together with the sealing member 20. .. In this case, while the internal combustion engine 1 is in operation, the engine cooling water flowing through the water jacket 2f is heated, and this heat heats the sealing member 20 and the lid of the front wall portion 13. As a result, the temperature inside the heating chamber becomes high, and the blow-by gas B can be heated.

(7th modification)
The cast hole 10 may be provided at an arbitrary position on the outer wall portion of the engine main body 2. For example, the cast hole of the seventh modification is formed in the outer wall portion of the cylinder block 2a and is sealed by a sealing member. Further, in the seventh modification, the heating member is connected to the sealing member so as to be heat transferable.

Although the embodiments of the present disclosure have been described in detail above, the embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications and applications included in the idea of the present disclosure defined by the scope of claims. For example, equivalents are included in this disclosure. Therefore, this disclosure should not be construed in a limited way and may be applied to any other technique that falls within the scope of the ideas of this disclosure.

1 Internal combustion engine 2 Engine body 10 Cast hole 11 Outer wall 20 Sealing member 30 Blow-by gas passage 31 Heating member 31A Heating chamber 40 Lid 50 Pipe 60 Heat transfer member 70 Heat transfer fin 100 Blow-by gas treatment device A Intake B Blow-by gas G exhaust

Claims (5)

It is a blow-by gas processing device for internal combustion engines.
The internal combustion engine is
The engine body formed by casting using a core,
A cast hole formed in the outer wall portion of the engine body and used for removing the sand-like material used for the core from the inside of the engine body after casting.
A sealing member inserted into the cast hole and for sealing the cast hole is provided.
The blow-by gas treatment device is
A blow-by gas passage arranged outside the engine body and
A blow-by gas processing apparatus comprising a part of the blow-by gas passage and a heating member connected to the sealing member so as to be heat transferable. The blow-by gas treatment apparatus according to claim 1, wherein the heating member is formed by a lid attached to the sealing member and defining a heating chamber together with the sealing member. The blow-by gas treatment device according to claim 2, wherein the sealing member includes heat radiation fins protruding into the heating chamber. The blow-by gas treatment apparatus according to claim 1, wherein the heating member is formed by a pipe portion defining a heating chamber. The blow-by gas treatment apparatus according to claim 4, further comprising a sealing member and a heat transfer member connecting the pipe portion.

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