JP2022011330A - Intake system for engine - Google Patents

Abstract

To provide an intake system for an engine capable of preventing freezing in a blow-by gas introduction port.SOLUTION: An intake system for an engine includes an intake conduit 2 provided in an intake passage 1, the intake conduit 2 including a blow-by gas introduction port 3 opened to the inner periphery thereof, and further includes a blow-by gas introduction pipe 4 protruded from the blow-by gas introduction port 3 to the outside of the intake conduit 2, and a blow-by gas heater 5 supported by a protruded end 4a of the blow-by gas introduction pipe 4, the blow-by gas heater 5 including a heat release part 6 lead out through the inside of the blow-by gas introduction pipe 4 to the blow-by gas introduction port 3. Between the heat release part 6 and the blow-by gas introduction pipe 4, a clearance 7 is formed. The clearance 7 is communicated with the inside of the intake conduit 2.SELECTED DRAWING: Figure 2

Description

The present invention relates to an engine intake device, and more particularly to an engine intake device capable of preventing freezing at a blow-by gas inlet.

Conventionally, there is an intake device of an engine provided with an intake conduit provided in the middle of an intake path, and the intake conduit is provided with a blow-by gas introduction port opened in the inner circumference thereof (see, for example, Patent Document 1).

JP-A-2009-156209 (see FIG. 2)

<< Problems >> Freezing is likely to occur at the blow-by gas inlet.
In the engine of Patent Document 1, when the engine is operated in cold weather, the water contained in the blow-by gas is cooled by the intake air, and freezing at the blow-by gas inlet is likely to occur.
In this case, the blow-by gas inlet may be blocked by ice, the internal pressure of the crankshaft may become excessive, and oil leakage from the bearing of the crankshaft or the like may occur.

An object of the present invention is to provide an engine intake device capable of preventing blockage due to freezing at a blow-by gas inlet.

The main configurations of the present invention are as follows.
As illustrated in FIG. 2, the blow-by gas heater (5) includes a heat-dissipating portion (6) led out from the inside of the blow-by gas introduction pipe (4) to the blow-by gas introduction port (3), and is provided with the heat-dissipating portion (6). An intake device for an engine, characterized in that a gap (7) is formed between the blow-by gas introduction pipes (4), and the gap (7) communicates with the inside of the intake conduit (2).

The invention of the present application has the following effects.
<< Effect >> Freezing at the blow-by gas inlet (3) can be prevented.
In this intake device, heat is dissipated at the blow-by gas introduction port (3) by the heat-dissipating portion (6) led out to the blow-by gas introduction port (3), and even during operation in cold weather, the blow-by gas (8) is contained. It is possible to prevent freezing of the blow-by gas inlet (3) due to the moisture in the above.
<< Effect >> The blow-by gas inlet (3) has a high anti-freezing function.
In this intake device, the heat of the heat dissipation part (6) is difficult to escape to the outside of the blow-by gas introduction pipe (4) due to the heat insulating function of the air that has entered the gap (7), and the heat dissipation efficiency at the blow-by gas introduction port (3). High, and the freeze-suppressing function at the blow-by gas inlet (3) is high.

It is a figure explaining the intake device of the engine which concerns on embodiment of this invention. FIG. 3 is a vertical cross-sectional view of a main part of the intake device of FIG. It is a right side view of the engine which uses the intake device of FIG. It is a front view of the engine of FIG. It is a left side view of the engine of FIG.

1 to 5 are views for explaining an intake device of an engine according to an embodiment of the present invention, and in this embodiment, a vertical in-line multi-cylinder diesel engine will be described.

The outline of this engine is as follows.
As shown in FIG. 3, this engine includes a cylinder block (15), a cylinder head (16) mounted on the upper part of the cylinder block (15), and a cylinder head cover (16) mounted on the upper part of the cylinder head (16). 17), a transmission gear case (19) arranged at the front of the cylinder block (15) with the erection direction of the crank shaft (18) in the front-rear direction, and a fly wheel (15) arranged at the rear of the cylinder block (15). 20) and an oil pan (29) assembled to the lower part of the cylinder block (15) are provided.

This engine has an intake manifold (21) and an intake manifold (21) assembled on the right side surface of the cylinder head (16) as shown in FIGS. 3 and 4, with the horizontal direction orthogonal to the front-rear direction as the left-right lateral direction. ), The intake throttle (22) assembled to the intake inlet, the common rail (23) erected on the right side of the cylinder head cover (17), and the fuel supply pump (24) arranged on the right side of the cylinder block (15). As shown in FIG. 5, the cylinder head (16) is provided with an exhaust manifold (25) assembled on the left side surface and a supercharger (26) assembled on the exhaust outlet of the exhaust manifold (25). ..

The fuel supply device of this engine is a common rail type fuel injection device including a fuel supply pump (24) and a common rail (23) shown in FIGS. 3 and 4.
The intake device of this engine includes an air cleaner (27) shown in FIG. 1, a sensor mounting pipe (30), a blow-by gas introduction pipe (4), an air compressor (26a) of a supercharger (26), and FIG. , The intake throttle (22) shown in FIG. 4 and the intake manifold (21) are provided.
The exhaust device of this engine includes an exhaust manifold (25) shown in FIGS. 4 and 5, an exhaust turbine (26b) of a supercharger (26), and an exhaust treatment device (28). The exhaust treatment device (28) houses the DOC (not shown) and the DPF (not shown) in the exhaust treatment case (28a). DOC is an abbreviation for diesel oxidation catalyst, and DPF is an abbreviation for diesel particulate filter.

As shown in FIG. 1, the intake device is externally fitted to the sensor mounting pipe (30), the airflow sensor (31) mounted on the sensor mounting pipe (30), and the inlet side portion of the sensor mounting pipe (30). The intake hose (32a), the intake hose (32b) fitted to the outlet side of the sensor mounting pipe (30), and the fasteners (33a) (33b) are provided.

The sensor mounting pipe (30) shown in FIG. 1 is a hard synthetic resin pipe. The airflow sensor (31) is a hot wire type. Each intake hose (32a) (32b) is a flexible rubber hose. Each fastener (33a) (33b) is a metallic tightening band. The direction of the intake air is indicated by an arrow of reference numeral (14) in FIG.

As shown in FIG. 2, this intake device includes an intake conduit (2) provided in the intake path (1), and the intake conduit (2) has a blow-by gas inlet (3) opened in the inner circumference thereof. It is equipped with.
As shown in FIG. 2, the intake device further includes a blow-by gas introduction pipe (4) protruding from the blow-by gas introduction port (3) to the outside of the intake conduit (2), and a protruding end of the blow-by gas introduction pipe (4). A blow-by gas heater (5) supported by the portion (4a) is provided.
As shown in FIG. 2, the blow-by gas heater (5) includes a heat-dissipating portion (6) led out from the inside of the blow-by gas introduction pipe (4) to the blow-by gas introduction port (3), and includes the heat-dissipating portion (6) and the blow-by. A gap (7) is formed between the gas introduction pipes (4), and this gap (7) communicates with the inside of the intake conduit (2).

In this intake device, heat is dissipated at the blow-by gas introduction port (3) by the heat-dissipating portion (6) led out to the blow-by gas introduction port (3), and even during operation in cold weather, the blow-by gas (8) is contained. It is possible to prevent freezing of the blow-by gas inlet (3) due to the moisture in the above.
Further, in this intake device, the heat of the heat radiating portion (6) is difficult to escape to the outside of the blow-by gas introduction pipe (4) due to the heat insulating function of the air that has entered the gap (7), and the heat of the blow-by gas introduction port (3) is used. The heat dissipation efficiency is high, and the freeze-suppressing function at the blow-by gas inlet (3) is high.

As shown in FIG. 2, the blow-by gas heater (5) includes a holder (9) attached to a protruding end portion (4a) of a blow-by gas introduction pipe (4) and a heat radiating portion (6) in the holder (9). A heat generating portion (10) in contact with the heat generating portion (10) is provided, and the heat radiating portion (6) is inserted into the blow-by gas introduction pipe (4) leaving a gap (7) around the heat generating portion (10).
In this intake device, a gap (7) through which the heat insulating air in the intake conduit (2) enters can be easily formed only by inserting the heat radiating portion (6) into the blow-by gas introduction pipe (4).

A metal pipe is used for the heat radiating portion (6) shown in FIG. 2, and heat is radiated from the inner peripheral surface thereof to the blow-by gas (8) passing through the inside thereof.
A heat generating portion of a PTC heater is used for the heat generating portion (10). The PTC heater is a heater having PTC characteristics, and the PTC characteristics refer to the property that the electric resistance value changes with a positive coefficient as the temperature rises.
A nichrome wire or other material may be used for the heat generating portion (10).
Power is supplied to the heat generating portion (10) from the power supply side via the power supply cable (34).

As shown in FIG. 2, the holder (9) is provided with a flange portion (9a), and the flange portion (9a) is attached to the protruding end portion (4a) of the blow-by gas introduction pipe (4) with a screw fastener (11). It is fixed.
In this intake device, the blow-by gas heater (5) can be easily attached to the blow-by gas introduction pipe (4) by fixing the flange portion (9a) of the holder (9) with the screw fastener (11).

As shown in FIG. 2, the holder (9) introduces blow-by gas (8) into a power supply port (9b) into which the connector (34a) of the power supply cable (34) is inserted and a heat dissipation portion (6) made of a metal pipe. A holder inlet pipe (9c) is provided, and a rubber blow-by gas introduction tube (35) led out from a cylinder head cover (17) shown in FIGS. 3 to 5 is connected to the holder inlet pipe (9c).

The blow-by gas introduction pipe (4) and the holder (9) shown in FIG. 2 are made of resin.
In this intake device, the heat of the heat radiating part (6) is difficult to escape to the outside of the blow-by gas introduction pipe (4) due to the low thermal conductivity of the resin blow-by gas introduction pipe (4) and the holder (9), and the blow-by gas is introduced. The heat dissipation efficiency of the heat radiating portion (6) at the mouth (3) is high, and the freeze suppression function at the blow-by gas introduction port (3) is high.

As shown in FIG. 2, the intake hose (12a) (12b) on the inlet side and the outlet side fitted to the inlet side and the outlet side of the intake conduit (2) is provided, and the intake conduit (2) is made of resin. The intake hoses (12a) and (12b) on the inlet side and the outlet side of the intake conduit (2) are both made of rubber.
In this intake device, the heat of the heat radiating portion (6) is difficult to escape to the outside of the intake conduit (2) due to the low thermal conductivity of the resin intake conduit (2) and the rubber intake hose (12a) (12b). The heat dissipation efficiency of the heat radiating unit (6) at the blow-by gas inlet (3) is high, and the freezing suppression function at the blow-by gas inlet (3) is high.

Each intake hose (12a) (12b) is fastened and fixed to the intake conduit (2) with a pair of fasteners (13a) (13b). The fasteners (13a) and (13b) are metallic tightening bands.
The intake hose (12a) on the inlet side of the intake conduit (2) and the intake hose (32b) on the outlet side of the sensor mounting pipe (30) are the same.

(1) ... Intake path, (2) ... Intake conduit, (3) ... Blow-by gas introduction port, (4) ... Blow-by gas introduction pipe, (4a) ... Protruding end, (5) ... Blow-by gas heater, (6) ... heat dissipation part, (7) ... gap, (8) ... blow-by gas, (9) ... holder, (9a) ... flange part, (10) ... heat generating part, (11) ... screw fastener, (12a) ... intake The intake hose (12b) on the inlet side of the conduit and the intake hose on the outlet side of the intake conduit.

Claims (5)

In the intake system of an engine, the intake conduit (2) is provided with an intake conduit (2) provided in the intake path (1), and the intake conduit (2) is provided with a blow-by gas inlet (3) opened on the inner circumference thereof.
A blow-by gas introduction pipe (4) protruding from the blow-by gas introduction port (3) to the outside of the intake conduit (2) and a blow-by gas heater (5) supported by the protruding end (4a) of the blow-by gas introduction pipe (4). Prepare,
The blow-by gas heater (5) includes a heat-dissipating portion (6) led out from the inside of the blow-by gas introduction pipe (4) to the blow-by gas introduction port (3), and the heat-dissipating portion (6) and the blow-by gas introduction pipe (4) mutually. An intake device for an engine, characterized in that a gap (7) is formed between the gaps (7), and the gap (7) communicates with the inside of the intake conduit (2). In the intake device of the engine according to claim 1,
The blow-by gas heater (5) has a holder (9) attached to the protruding end portion (4a) of the blow-by gas introduction pipe (4) and a heat generating portion (10) in the holder (9) that is in contact with the heat radiating portion (6). The intake device of the engine is characterized in that the heat radiating portion (6) is inserted into the blow-by gas introduction pipe (4) leaving a gap (7) around the heat radiating portion (6). In the intake device of the engine according to claim 2.
The holder (9) includes a flange portion (9a), and the flange portion (9a) is fixed to the protruding end portion (4a) of the blow-by gas introduction pipe (4) with a screw fastener (11). The characteristic engine intake system. In the intake device of the engine according to claim 2 or 3.
An engine intake device characterized in that the blow-by gas introduction pipe (4) and the holder (9) are made of resin. In the intake device of the engine according to any one of claims 1 to 4.
The intake hose (12a) (12b) on the inlet side and the outlet side fitted to the inlet side and the outlet side of the intake conduit (2) is provided, and the intake conduit (2) is made of resin, and the intake conduit (2) is provided. The intake hose (12a) and (12b) on the inlet side and the outlet side of the above are both made of rubber, which is an intake device for the engine.

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