JP6019481B2 - Engine condensate discharge structure - Google Patents

Description

  The present invention relates to a condensed water discharge structure for an engine that discharges condensed water generated in an intake passage to an intake manifold.

  As an example of an internal combustion engine having a low pressure EGR (Exhaust Gas Recirculation), FIG. 18 shows an intake passage 12, an exhaust passage 13, a catalyst (filter) 14, an engine 15, a turbocharger 21, an intercooler. 22 shows a system including a condensed water storage tank 23, a bypass passage 24, a high pressure EGR 27, a high pressure throttle valve 28, a low pressure EGR 30 and a low pressure throttle valve 31.

  The above-described turbocharger 21 compresses the air in the intake passage 12 to increase the charging efficiency, and is provided so as to straddle the intake passage 12 and the exhaust passage 13. And a turbine on the exhaust passage 13 side (not shown).

  The above-described intercooler 22 cools the intake air sent from the turbocharger 21 and further increases the charging efficiency, and is provided downstream of the turbocharger 21 in the intake passage 12.

  The condensate storage tank 23 described above stores condensate generated by intake air passing through the intercooler 22, and is provided downstream of the intercooler 22 in the intake passage 12.

  The above-described bypass passage 24 is a passage for discharging condensed water from the condensed water storage tank 23, and communicates the condensed water storage tank 23 with the intake manifold (a position indicated by a in FIG. 18).

  The high-pressure EGR 27 described above is an EGR that sends exhaust gas from between the engine 15 and the turbocharger 21 in the exhaust passage 13 into the intake passage 12 between the intercooler 22 and the engine 15. A high pressure EGR valve 29 for controlling the exhaust gas recirculation amount is provided at a portion where the high pressure EGR 27 joins with the intake passage 12, and the high pressure EGR valve 29 is connected to the high pressure throttle valve 28 in the intake passage 12. It arrange | positions so that it may be located in the downstream rather than.

  The high-pressure throttle valve 28 described above is a throttle valve that adjusts the amount of intake air, and is provided in the intake passage 12 on the downstream side of the condensed water storage tank 23.

  The low-pressure EGR 30 is an EGR that sends exhaust gas from the turbocharger 21 in the exhaust passage 13 and the downstream side of the catalyst 14 to the upstream side of the turbocharger 21 in the intake passage 12. The catalyst 14 is a filter that purifies exhaust gas components provided in the exhaust passage 13. The low-pressure EGR 30 is provided with an EGR cooler 33 that cools air passing through the inside, and a low-pressure EGR valve 32 that controls the amount of exhaust gas recirculation is provided at a portion where it joins the intake passage 12.

  The above-described low-pressure throttle valve 31 is a throttle valve that adjusts the intake amount of intake air, and is provided upstream of the low-pressure EGR valve 32 in the intake passage 12.

  The breather hose 34 described above is a passage for sending blow-by gas from the engine 15 to the upstream side of the low-pressure throttle valve 31 in the intake passage 12 (that is, the upstream side of the turbocharger 21).

  By using the system described above, condensed water or the like can be accumulated upstream of the intake side and guided to the intake manifold.

JP 2002-106429 A JP 2012-87773 A

  Patent Document 1 discloses a technique for preventing freezing due to moisture in EGR gas by taking into account the positional relationship in the intake passage between the blow-by gas flow passage provided in the engine portion and the EGR in a system including EGR. Has been proposed.

  Patent Document 2 proposes a technique for guiding condensed water or oil accumulated in a lower portion of a surge tank in an intake manifold into an engine cylinder.

  However, in the system using the low pressure EGR as described above, an oil component contained in blow-by gas and condensed water are mixed, and a part of the emulsion is emulsified to have a viscosity higher than water (hereinafter referred to as an emulsion composition). The problem of being generated occurs.

  Further, when the bypass passage is provided as described above, there is a concern that the emulsion composition may block the bypass passage and make it difficult to discharge condensed water.

  Therefore, an object of the present invention is to ensure the function of discharging condensed water by separating the emulsion composition in the intake manifold and cylinder head provided with the outlet of the bypass passage.

The condensed water discharge structure for an engine according to the first invention for solving the above-described problem is
A condensate storage tank for storing condensate generated by the intake air passing through the intercooler;
A bypass passage that allows the condensed water storage tank and the intake manifold to communicate with each other, and allows the condensed water to be discharged into the intake manifold;
An engine condensate drainage structure comprising an exhaust gas recirculation device that sends exhaust gas to the upstream side of the turbocharger of the intake passage from the downstream side of the turbocharger of the exhaust passage ,
The intake manifold is provided between a plurality of intake port openings provided in accordance with the intake ports of the cylinder head and the adjacent intake port openings, and protrudes upstream to divide the intake flow. Having a raised portion,
The cylinder head has a hollow portion provided according to the position of the build-up portion between the adjacent intake ports,
The build-up portion includes an internal passage that communicates with the bypass passage inside the build-up portion and guides the condensed water that has been fed from the bypass passage to the hollow portion, and the hollow portion on the hollow portion side of the build-up portion. A recessed groove portion that is formed on the wall surface so as to face the recessed portion, communicates with the adjacent intake port openings, and forms a discharge passage that guides condensed water that has passed through the recessed portion to the adjacent intake ports. It is characterized by that.

The condensed water discharge structure for an engine according to the second invention for solving the above-mentioned problem is as follows.
In the engine condensed water discharge structure according to the first aspect of the present invention,
Between the build-up part and the depression part, there is a hole opened corresponding to the depression part side outlet of the internal passage so as to cover the whole opening of the depression part, and the oil component from the condensed water It is characterized by comprising a filter for separating.

The condensed water discharge structure for an engine according to the third invention for solving the above-described problem is
In the engine condensed water discharge structure according to the second aspect of the invention,
The recessed portion side outlet of the internal passage and the recessed groove portion are formed so as to cross each other and are positioned at the uppermost portion of the recessed portion.

The condensed water discharge structure for an engine according to the fourth aspect of the present invention for solving the above problem is as follows:
In the engine condensed water discharge structure according to the second aspect of the invention,
The concave groove portion is positioned at the uppermost portion of the concave portion, and the concave portion side outlet of the internal passage is positioned below the concave groove portion.

According to the condensed water discharge structure for an engine according to the first aspect of the present invention, the condensed water flows into the hollow portion of the cylinder head through the internal passage in the build-up portion, and then forms a discharge passage communicated with the intake passage. It is discharged through the groove. At this time, since the emulsion composition mixed in the condensed water that has flowed into the depression is precipitated at the bottom of the depression, the emulsion composition can be separated. Thereby, obstruction | occlusion of a bypass channel can be suppressed and the discharge function of condensed water can be ensured.

According to the condensed water discharge structure for an engine according to the second aspect of the present invention, the filter is further provided to further improve the function of separating the emulsion composition from the condensed water in the recessed portion of the cylinder head, thereby further suppressing the blockage of the bypass passage. can do.

According to the condensed water discharge structure for an engine according to the third aspect of the present invention, since the recessed portion side outlet and the recessed groove portion of the internal passage are located at the uppermost portion of the recessed portion, the emulsion composition mixed with the condensed water is the recessed portion. And the emulsion composition can be more reliably separated at the depression of the cylinder head. Moreover, it can suppress that the emulsion composition collected in the hollow part of a cylinder head adheres to a filter, and can suppress the pressure loss raise of a bypass channel.

According to the condensed water discharge structure for an engine according to the fourth aspect of the present invention, the recessed groove portion is positioned at the uppermost portion of the recessed portion, and the recessed portion side outlet of the internal passage is positioned below the recessed groove portion, so that the cylinder head It is possible to suppress adhesion of the emulsion composition accumulated in the depression of the filter to the filter, and to suppress an increase in pressure loss of the bypass passage, and the condensed water flows from the lower part to the upper side of the depression part of the cylinder head. So the flow is smooth.

It is a perspective view of the condensed water discharge structure of the engine concerning Example 1 of the present invention. It is a perspective view of the state which decomposed | disassembled the condensed water discharge structure of the engine which concerns on Example 1 of this invention. It is an expansion perspective view of the build-up part vicinity of the intake manifold in Examples 1-4 of this invention. It is AA sectional drawing of FIG. 1 in Example 1 of this invention. FIG. 3 is a BB arrow view of FIG. 2 in Embodiment 1 of the present invention. It is AA sectional drawing of FIG. 1 in Example 2 of this invention. FIG. 6 is a view taken along the line BB in FIG. 2 in Embodiment 2 of the present invention. It is CC arrow line view of FIG. 2 in Example 2 of this invention. FIG. 9 is a sectional view taken along the line DD of FIG. 8 in Example 2 of the present invention. It is AA sectional drawing of FIG. 1 in Example 3 of this invention. FIG. 6 is a view taken along the line BB in FIG. 2 in Embodiment 3 of the present invention. It is CC arrow line view of FIG. 2 in Example 3 of this invention. FIG. 13 is a sectional view taken along the line DD of FIG. 12 in Example 3 of the present invention. It is AA sectional drawing of FIG. 1 in Example 4 of this invention. FIG. 6 is a view taken along the line BB in FIG. 2 in Embodiment 4 of the present invention. It is CC arrow line view of FIG. 2 in Example 4 of this invention. It is DD sectional drawing of FIG. 16 in Example 4 of this invention. It is the schematic explaining a system provided with low pressure EGR and a bypass passage.

  In the present invention, as shown in FIG. 1, by providing a depression in the cylinder head 43, the emulsion composition mixed with oil is separated from the condensed water passing through the bypass passage 24 and stored. A structure is proposed in which the condensed water, which is mainly separated by moisture, can be discharged to each intake port in an equal amount.

  Hereinafter, a condensed water discharge structure for an engine according to the present invention will be described with reference to the drawings in an embodiment.

  A condensed water discharge structure for an engine according to Embodiment 1 of the present invention will be described with reference to FIGS. The apparatus includes a bypass passage 24, an intake manifold 41, a gasket 42, a cylinder head 43, and a condensed water storage tank 23 (see FIG. 18 and the above description for the condensed water storage tank 23).

  The bypass passage 24 described above is a passage through which the condensed water storage tank 23 and the intake manifold 41 are communicated to discharge the condensed water and the mixture. Although not shown in the drawing, a plurality of outlets on the intake manifold side are provided. Branched.

  The intake manifold 41 is a branch pipe that distributes the intake air from the intake passage 12 to each cylinder (not shown). FIG. 2 is an exploded perspective view of the present apparatus. Here, the flow of intake air in the intake manifold 41 is indicated by broken-line arrows.

  As shown in FIG. 2, the intake manifold 41 is provided between the intake port opening 54 provided in accordance with the intake port 52 of the cylinder head 43 and the adjacent intake port openings 54 and protrudes upstream. And a built-up portion 53 for diverting the flow of intake air.

  Although only a part is shown in FIG. 2, an outlet branched into a plurality of bypass passages 24 is connected to a portion other than the central built-up portion 53 among the three built-up portions 53. Although FIG. 2 shows a shape corresponding to an in-line four-cylinder engine, this apparatus is not limited to an in-line four-cylinder engine. That is, regardless of the engine shape, it is only necessary that the outlets branched into a plurality of bypass passages 24 are connected from the lower side to every other built-up portion 53.

  As shown in FIG. 2, the gasket 42 described above is provided at a joint portion between the intake manifold 41 and the cylinder head 43 and maintains hermeticity.

  The above-described cylinder head 43 is a lid that covers the cylinder, and is adjacent to the intake port 52 that is a passage of intake air from each valve of the cylinder head and the position of the build-up portion 53 of the intake manifold 41. And a recess 51 provided between the intake ports 52.

  Further, the built-up portion 53 of the intake manifold 41 to which the bypass passage 24 is connected is formed inside the built-up portion 53, and the condensed water fed from the bypass passage 24 is guided to the recessed portion 51 of the cylinder head 43. A condensed water internal passage 65 and a condensed water discharge passage 66 that are formed on the wall surface of the built-up portion 53 on the side of the recessed portion 51 and guide condensed water passing through the recessed portion 51 to the intake port 52 are provided.

  The condensed water discharge passage 66 is formed on the wall surface of the built-up portion 53 on the recessed portion 51 side so as to face the recessed portion 51, and is a recess communicated with the intake port opening 54 and the intake port 52 on both sides of the built-up portion 53. It consists of a groove. The outlet of the condensed water internal passage 65 and the recessed groove portion that is the condensed water discharge passage 66 are formed so as to intersect with each other.

  3 is an enlarged view of the built-up portion 53. In the figure, the one-dot chain arrow indicates the flow of condensed water sent from the bypass passage 24, and the broken arrow indicates the flow of intake air from the intake passage 12 (see FIG. 18). Each is shown (the same applies to other figures). As shown in FIG. 3, the condensed water discharged from the bypass passage 24 passes through the condensed water internal passage 65, branches into a two-way flow, passes through the condensed water discharge passage 66, and then is built up. It exits from the condensed water discharge passage outlet 67 at both ends of 53, merges with the intake air from the intake passage 12, and is sent to the intake port 52 of the cylinder head 43 from the intake port openings 54 on both sides of the built-up portion 53. .

  In FIG. 3, it appears that the one-dot chain line arrow protrudes outside when moving from the condensed water internal passage 65 to the condensed water discharge passage 66. This is because the flow of condensed water is once depressed in the cylinder head 43. This represents entering the section 51.

  4 is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 4, in the present apparatus, the condensed water flowing through the bypass passage 24 enters the recessed portion 51 provided in the cylinder head 43 via the condensed water internal passage 65, and the condensed water discharge passage 66 is formed. Via the intake port 52.

  In FIG. 4, the one-dot chain line arrow is divided into two. This is because the emulsion composition 70 has a higher viscosity than water, and therefore it is difficult for the emulsion composition 70 to flow into the condensed water discharge passage 66 from the recess 51 where the flow path is narrowed. As a result, the emulsion composition 70 is stored in the recess 51, and the condensed water mainly containing water is separated from the emulsion composition 70 and discharged to the intake port 52 through the condensed water discharge passage 66. Represents a state. Thereby, obstruction | occlusion of the bypass channel 24 is suppressed.

  FIG. 5 is a view taken along the line BB in FIG. As shown in FIG. 5, the condensed water that has passed through the condensed water internal passage 65 and is separated from the emulsion composition 70 through the recess 51 and mainly contains water passes through the condensed water discharge passage 66. The flow branches in two directions and is sent to the intake port 52 of the cylinder head 43 in equal amounts from the intake port openings 54 on both sides.

  As described above, according to the condensed water discharge structure for an engine according to the first embodiment of the present invention, the condensed water is discharged from the condensed water discharge passage 66 to the intake port 52 after the condensed water is introduced into the recess 51. The emulsion composition 70 which is a mixture with the oil component can be separated from the condensed water in the recess 51. Thereby, the discharge function of condensed water is securable.

  The engine condensed water discharge structure according to the second embodiment of the present invention is obtained by changing the shape of the gasket 42 in the engine condensed water discharge structure according to the first embodiment. Hereinafter, this apparatus will be described with reference to FIGS.

  6 is a diagram corresponding to the AA cross-sectional view of FIG. 1, and FIG. 7 is a diagram corresponding to the BB arrow view of FIG. As shown in FIG. 6, this apparatus is similar to the condensed water discharge structure of the engine according to the first embodiment, and includes a bypass passage 24, an intake manifold 41, a gasket 42, a cylinder head 43, and a condensed water storage tank 23 (see FIG. 18). The flow of condensed water is substantially the same as shown in FIG. Description of the bypass passage 24, the intake manifold 41, the cylinder head 43, and the condensed water storage tank 23 is omitted.

  The basic structure of the gasket 42 is the same as that of the condensed water discharge structure of the engine according to the first embodiment. However, as shown in FIG. 6, the device further includes a filter for separating oil components. A non-woven fabric 80 is provided.

  8 is a view corresponding to the CC arrow view of FIG. 2, and FIG. 9 is a DD cross-sectional view of FIG. As can be seen from FIGS. 8 and 9, the nonwoven fabric 80 has an upper end and a lower end fixed to the gasket 42, covers the entire mouth of the recess 51, and does not block the condensed water internal passage 65. An internal passage hole 81 formed corresponding to the outlet of the passage 65 and a discharge passage protrusion 82 for closing the entire condensed water discharge passage 66 are provided. However, the gasket 42 and the nonwoven fabric 80 may be integrated or separated.

  In this apparatus, by installing the non-woven fabric 80 on the gasket 42, the function of separating the emulsion composition 70 from the condensed water in the recess 51 is further improved as compared with the condensed water discharge structure of the engine according to the first embodiment. Blockage of the bypass passage 24 can be further suppressed.

  Moreover, although this apparatus demonstrated and demonstrated the nonwoven fabric as an example, in fact, it is not limited to a nonwoven fabric, What is necessary is just to play the role of a filter. The same applies to the following embodiments.

  The condensed water discharge structure for an engine according to the third embodiment of the present invention includes an outlet for the condensed water internal passage 65 and a condensed water discharge passage 66 in the intake manifold 41 in the condensed water discharge structure for the engine according to the second embodiment. The position of the concave groove portion to be formed is changed. Hereinafter, this apparatus will be described with reference to FIGS.

  FIG. 10 is a view corresponding to the AA cross-sectional view of FIG. As shown in FIG. 10, this apparatus is similar to the condensed water discharge structure of the engine according to the second embodiment, and includes a bypass passage 24, an intake manifold 41, a gasket 42, a cylinder head 43, and a condensed water storage tank 23 (see FIG. 18). This also applies to the point that the nonwoven fabric 80 is provided on the gasket 42.

  The intake manifold 41 described above has the same basic structure as the condensed water discharge structure of the engine according to the first and second embodiments. However, in this apparatus, the outlet of the condensed water internal passage 65 and the condensed water discharge passage 66 are used. Is located at the top of the recess 51. FIG. 11 is a view corresponding to the BB arrow view of FIG. 2, but it can be seen that the positions of the outlet of the condensed water internal passage 65 and the condensed water discharge passage 66 are changed. Recognize.

  12 is a view corresponding to the CC arrow view of FIG. 2, and FIG. 13 is a DD arrow view of FIG. As shown in FIGS. 12 and 13, the positions of the internal passage hole 81 and the discharge passage protrusion 82 of the nonwoven fabric 80 described above are changed in accordance with the positions of the condensed water internal passage 65 and the condensed water discharge passage 66. To do. Thereby, it can suppress that the emulsion composition 70 collected in the hollow part 51 adheres to the nonwoven fabric 80 around the passage 66 for condensed water discharge.

  In the present apparatus, by changing the positions of the condensed water internal passage 65 and the condensed water discharge passage 66, the emulsion composition 70 mixed with the condensed water easily settles in the lower part of the recess 51, and the emulsion composition 70 is It can isolate | separate more reliably by the hollow part 51. FIG. Moreover, it can suppress that the emulsion composition 70 collected in the hollow part 51 adheres to the nonwoven fabric 80 around the passage 66 for condensed water discharge, and it is a bypass passage rather than the condensed water discharge structure of the engine which concerns on Example 2. FIG. The increase in pressure loss of 24 can be suppressed.

  The condensed water discharge structure for the engine according to the fourth embodiment of the present invention is the same as that of the third embodiment. Among the condensed water discharge structures for the engine according to the second embodiment, the outlet of the condensed water internal passage 65 in the intake manifold 41 and the condensed water are provided. The position of the concave groove portion forming the discharge passage 66 is changed. Hereinafter, this apparatus will be described with reference to FIGS.

  FIG. 14 is a view corresponding to the AA cross-sectional view of FIG. As shown in FIG. 14, this apparatus is similar to the condensed water discharge structure of the engine according to the third embodiment. Bypass passage 24, intake manifold 41, gasket 42, cylinder head 43, and condensed water storage tank 23 (see FIG. 18). This also applies to the point that the nonwoven fabric 80 is provided on the gasket 42.

  The intake manifold 41 described above has the same basic structure as the condensed water discharge structure of the engine according to the first to third embodiments. The outlet of the condensed water internal passage 65 is positioned below the condensed water discharge passage 66. FIG. 15 is a view corresponding to the BB arrow view of FIG. 2, but it can be seen that the positions of the outlet of the condensed water internal passage 65 and the condensed water discharge passage 66 are changed. Recognize.

  16 is a view corresponding to the CC arrow view of FIG. 2, and FIG. 17 is a DD arrow view of FIG. As shown in FIGS. 16 and 17, the position of the internal passage hole 81 of the nonwoven fabric 80 is changed in accordance with the position of the condensed water internal passage 65. Furthermore, since the position of the outlet of the condensed water internal passage 65 and the position of the condensed water discharge passage 66 are different, the hole of the nonwoven fabric 80 is a recessed portion unlike the condensed water discharge structure of the engine according to the second and third embodiments. No between 51 and the condensed water discharge passage 66. Therefore, the discharge passage projection 82 in the engine condensed water discharge structure according to the second and third embodiments is not necessary. Thereby, while suppressing the emulsion composition 70 accumulated in the depression 51 from adhering to the nonwoven fabric 80 around the condensed water discharge passage 66, the condensed water passes through the depression 51 from the condensed water internal passage 65. Thus, the flow until it is fed into the condensed water discharge passage 66 becomes smooth.

  In this apparatus, by devising the position of the condensed water internal passage 65, the emulsion composition 70 accumulated in the recess 51 is prevented from adhering to the non-woven fabric 80 around the condensed water discharge passage 66, and the bypass passage 24, and the condensed water flows from the lower side to the upper side of the recessed portion 51, so that the condensed water discharge passage 66 passes from the condensed water internal passage 65 through the recessed portion 51. The flow until it is sent to becomes smooth.

  The present invention is suitable as a condensed water discharge structure for an engine.

12 Intake passage 13 Exhaust passage 14 Catalyst (filter)
15 Engine 21 Turbocharger 22 Intercooler 23 Condensate storage tank 24 Bypass passage 27 High pressure EGR
28 High-pressure throttle valve 29 High-pressure EGR valve 30 Low-pressure EGR
31 Low-pressure throttle valve 32 Low-pressure EGR valve 33 EGR cooler 34 Breather hose 41 Intake manifold 42 Gasket 43 Cylinder head 51 Recessed portion 52 Intake port 53 Overlay portion 54 Inlet port opening 65 Condensed water internal passage 66 Condensed water discharge passage ( Concave groove)
67 Condensate drain passage outlet 70 Emulsion composition 80 Nonwoven fabric (filter)
81 Internal passage hole 82 Discharge passage projection

Claims (4)

A condensate storage tank for storing condensate generated by the intake air passing through the intercooler;
A bypass passage that allows the condensed water storage tank and the intake manifold to communicate with each other, and allows the condensed water to be discharged into the intake manifold;
An engine condensate drainage structure comprising an exhaust gas recirculation device that sends exhaust gas to the upstream side of the turbocharger of the intake passage from the downstream side of the turbocharger of the exhaust passage ,
The intake manifold is provided between a plurality of intake port openings provided in accordance with the intake ports of the cylinder head and the adjacent intake port openings, and protrudes upstream to divide the intake flow. Having a raised portion,
The cylinder head has a hollow portion provided according to the position of the build-up portion between the adjacent intake ports,
The build-up portion includes an internal passage that communicates with the bypass passage inside the build-up portion and guides the condensed water that has been fed from the bypass passage to the hollow portion, and the hollow portion on the hollow portion side of the build-up portion. A recessed groove portion that is formed on the wall surface so as to face the recessed portion, communicates with the adjacent intake port openings, and forms a discharge passage that guides condensed water that has passed through the recessed portion to the adjacent intake ports. The condensed water discharge structure of the engine characterized by this.   Between the build-up part and the depression part, there is a hole opened corresponding to the depression part side outlet of the internal passage so as to cover the whole opening of the depression part, and the oil component from the condensed water The condensed water discharge structure for an engine according to claim 1, further comprising a filter for separating the water.   The condensed water discharge structure for an engine according to claim 2, wherein the recess-side outlet of the internal passage and the concave groove are formed so as to cross each other and are positioned at the uppermost part of the recess.   The condensed water discharge of the engine according to claim 2, wherein the concave groove portion is positioned at an uppermost portion of the concave portion, and the outlet portion side outlet of the internal passage is positioned below the concave groove portion. Construction.

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