MIXING CONNECTION AND MOTOR

Abstract

Mixed connection (100), comprising: an intake duct (101) for introducing outside air into an engine housing (2); an EGR channel (103) which takes in a portion of the exhaust gas expelled from the engine housing (2) for use as EGR gas and returns the EGR gas to the intake channel (103); and a merging section (104) that connects the EGR channel (103) with an intermediate section of the intake channel (101) in the longitudinal direction, so that the longitudinal directions of the intake channel (101) and the EGR channel (103) intersect, wherein an upstream region (116), which is arranged on one side of the inlet opening (101A) of the intake duct (101) from the merging section (104) on an opposite wall surface (115) forming an inner surface of the intake duct (101) and is arranged on a side opposite the merging section (104) in a direction perpendicular to the longitudinal direction of the intake duct (101), comprises a first wall surface (116A) and a second wall surface (116B) arranged successively at a distance from the side of the merging section (104) in the direction of the inlet opening (101A) in the longitudinal direction of the intake duct (101), and a third wall surface (116C) projecting inwards from the first wall surface (116A) between the first wall surface (116A) and the second wall surface (116B), wherein the first wall surface (116A) and the third wall surface (116C) are continuously connected to each other, and the second wall surface (116B) and the third wall surface (116C) are continuously connected to each other.

Description

Technical field

[0001] The present invention relates to a mixing port and a motor. State of the art

[0002] Patent documents 1 to 3 disclose an engine as follows. To reduce the NOx content in the exhaust gas of an engine housing, a portion of the exhaust gas discharged from the engine housing is mixed with ambient air (fresh air), which is used as exhaust gas recirculation (EGR) gas. The EGR gas is recirculated back into the engine housing. In the engine disclosed in patent documents 1 to 3, a heater is provided to warm the ambient air upstream of a merging section of the EGR gas in an intake duct that introduces the ambient air into the engine housing. Citation list of patent literature [Patent Document 1] US Patent Application US 2012 / 0180478A1 [Patent document 2] Unexamined Japanese patent application JP 2018-188983A [Patent document 3] Unexamined Japanese patent application JP 2010-144669A

[0003] Document JP 2006-200 475 A relates to an intake system for an engine, comprising a backfire prevention rib provided on the inner circumference of an outlet opening of an intake air pipe such that its diameter gradually decreases towards a downstream side. A downstream end of the backfire prevention rib has a step with a surface perpendicular to an inner circumferential surface of the intake air pipe.

[0004] Document AT 504 179 A2 relates to an internal combustion engine with an intake system connected to an intake manifold via at least one exhaust gas recirculation (EGR) line. Each cylinder has two intake ports connected to the intake system and two exhaust ports connected to the exhaust system. The intake manifold, which is curved overall, has an approximately straight mixing section between a bend and an intake manifold. Leading downstream of the EGR line's junction opening into the intake manifold, several swirl elements are provided on the intake manifold wall, formed by a helical guide rib. The guide ribs are arranged at equal intervals within the intake manifold. Disclosure of the invention Technical problem

[0005] However, in this engine type, the EGR gas can, in some cases, flow in the opposite direction to the upstream side of the intake manifold from the merging section. In this case, the soot contained in the EGR gas adheres to the heater core, causing the problem of impaired heater performance.

[0006] A backflow of EGR gas in the intake manifold is generated as follows. When the engine is running, all intake valves of the engine block are closed immediately or temporarily, and the flow of outside air from the intake manifold towards the engine block is temporarily stopped.

[0007] The present invention was conceived in view of the problems, and it is an object thereof to provide a mixing connection and a motor that can prevent a deterioration in the performance of a heater by preventing EGR gas from entering the heater. Solution to the problem

[0008] According to a first aspect of the present invention, a mixing port is provided comprising an intake duct for introducing outside air into an engine housing, an EGR duct which receives a portion of the exhaust gas expelled from the engine housing for use as EGR gas and returns the EGR gas to the intake duct, and a merging section which connects the EGR duct in an intermediate section of the intake duct in a longitudinal direction, such that the longitudinal directions of the intake duct and the EGR duct intersect.An upstream side region, located on an inlet-opening side of the intake duct opposite the merging section on a wall surface forming an inner surface of the intake duct and positioned on a side opposite the merging section in a direction perpendicular to the longitudinal direction of the intake duct, comprises a first wall surface and a second wall surface arranged sequentially at a distance from the side of the merging section in the direction of the inlet opening along the longitudinal direction of the intake duct, and a third wall surface projecting inward from the first wall surface between the first and second wall surfaces. The first and third wall surfaces are continuously connected to each other, and the second and third wall surfaces are continuously connected to each other.

[0009] According to a second aspect of the present invention, a mixing port is provided, comprising an intake port for introducing outside air into an engine housing, an EGR port that takes in a portion of the exhaust gas expelled from the engine for use as EGR gas and returns the EGR gas to the intake port, and a merging section that connects the EGR port to an intermediate section of the intake port longitudinally, such that the longitudinal directions of the intake port and the EGR port intersect. The intake port has an upstream channel comprising an inlet opening of the intake port, a downstream channel located on a downstream end face of the upstream channel and extending in a direction opposite the upstream channel, and a curved channel connecting the upstream channel and the downstream channel.The merging section is arranged at least in an upstream end section of the downstream channel, which is provided on the side of the curved channel. The mixing port comprises a projecting section that extends radially from an inner region corresponding to an inside of the curved channel onto an inner surface of the downstream channel and faces the merging section by being positioned between the merging section and an opposing region, wherein the opposing region faces the merging section and is located on a side opposite the merging section in a direction perpendicular to the longitudinal direction of the intake channel. A gap is formed between a tip of the projecting section in a projection direction and an outer surface facing the inner region on the inner surface of the downstream channel.

[0010] According to the first aspect of the present invention, a motor is provided which includes the mixing port and a motor housing. Advantageous effects of the invention

[0011] According to the present invention, it is possible to suppress a deterioration in the performance of a heater provided in an inlet opening of an intake duct by preventing the EGR gas from reaching the heater. Brief description of the drawings Fig. Figure 1 shows a schematic view of an engine according to an embodiment of the present invention. Fig. Figure 2 shows a perspective view of an external view of a mixing connection according to the embodiment of the present invention. Fig. Figure 3 shows a perspective view of an intake manifold and an EGR channel within the mixing port of the Fig. 2. Fig. Figure 4 shows a sectional view along a line IV-IV in Fig. 2. Fig. 5 shows a sectional view along a line VV in Fig. 4. Fig. Figure 6 shows a sectional view along a line VI-VI in Fig. 4. Fig. Figure 7 shows a sectional view along a line VII-VII in Fig. 4 to 6. Fig. Figure 8 shows a sectional view along a line VIII-VIII in Fig. 5 to 7. Preferred embodiment of the invention

[0012] In the following, an embodiment according to the present invention is described with reference to Fig. Sections 1 to 8 are described in detail. A mixing connection 100 according to the present embodiment comprises a motor 1 which is in Fig. Figure 1 is shown. First, the motor 1 is described. <motor>

[0013] As in Fig. As shown in Figure 1, the motor 1 comprises a motor housing 2 which, in addition to a mixing port 100 (which will be described later), includes inside a plurality of combustion chambers 2A. The motor housing 2 in Fig. 1 is a three-cylinder engine with three combustion chambers 2A.

[0014] Furthermore, the engine 1 also includes an intake path 3, an air filter 4, an exhaust gas turbocharger 5 with a turbine 5A and a compressor 5B, an aftercooler 6, and an intake manifold 7. The intake path 3 is a path for introducing outside air into the engine housing 2. The air filter 4, the compressor 5B of the exhaust gas turbocharger 5, and the aftercooler 6 are arranged in this order in the intake path 3, oriented towards the engine housing 2.

[0015] The exhaust gas turbocharger uses the exhaust gas expelled from the engine housing 2 to compress the outside air drawn in through the air filter 4. The turbine 5A of the exhaust gas turbocharger 5 is rotated by the exhaust gas energy. The compressor 5B of the exhaust gas turbocharger 5 rotates together with the turbine 5A and compresses the outside air. The aftercooler 6 cools the air (outside air) that has been compressed and heated by the exhaust gas turbocharger 5.

[0016] The intake manifold 7 is arranged between the engine housing 2 and the intake path 3 and distributes the air (ambient air) flowing from the intake path to the respective combustion chambers 2A. According to the present embodiment, the intake manifold 7 has a main flow section 7A, which extends in one direction of the arrangement of the combustion chambers 2A and through which the air from the intake path 3 flows, and a plurality of (in the illustrated example 3) branch sections 7B, which extend from the main flow section 7A to the respective combustion chambers 2A. The plurality of branch sections 7B are each connected to the main flow section 7A at positions far apart in one direction of extension of the main flow section 7A. Therefore, in the intake manifold 7A according to the present embodiment, the lengths of the multiple paths from an inlet to the respective combustion chambers 2A are different.In the intake manifold 7, for example, the lengths of the multitude of paths described above can be the same.

[0017] The engine further comprises an exhaust path 8, an exhaust port 9, an EGR path 10, an EGR cooler 11, and an EGR valve 12. The exhaust path 8 is a path for extracting exhaust gas from the engine housing 2. The previously described turbine 5A of the exhaust gas turbocharger 5 is arranged at an intermediate section of the exhaust path 8. The exhaust port 9 is located between the engine housing 2 and the exhaust path 8 and collects the exhaust gas from the respective combustion chambers 2A of the engine housing 2, so that the exhaust gas flows into the exhaust path 8.

[0018] The EGR path 8 extends from the exhaust port 9 to a section of the intake path 3 between the aftercooler 6 and the intake port 7. For example, the EGR path 10 can extend from the exhaust path 8 to the intake path 3. The EGR path 10 is a path for capturing a portion of the exhaust gas discharged from the engine block 2 as EGR gas and for returning the EGR gas to the intake path 3. The EGR cooler 11 and the EGR valve 12 are oriented in that order towards the intake path 3 in the EGR path 10.

[0019] The EGR cooler 11 cools the EGR gas. The EGR valve 2 opens and closes the EGR path 10. The EGR valve 12 opens the EGR path 10 when the pressure of the EGR gas (exhaust gas) in the EGR path 10 is higher than the pressure of the ambient air flowing through the intake path 3. In this way, the EGR gas can be recirculated to the intake path 3. The EGR valve 12 is controlled by an engine control unit (not shown) to open and close in accordance with a detection signal output from the NOx content detection device (not shown), which is located in the exhaust path 8 or the exhaust port 9. <mischanschluss>

[0020] The mixing port 100 forms a section where the intake path 3 and the EGR path 10 are combined. The mixing port 100 is described below.

[0021] The mixing port 100 according to the present embodiment is a casting. As in Fig. 2 and Fig. As shown in Figure 3, the mixing port 100 comprises an intake channel 101, a heater 102, an EGR channel 103 and a merging section 104. Fig. Figure 3 shows an inner channel of the mixing port 100 with the intake channel 101 and the EGR channel 103.

[0022] The intake duct 101 is a channel for introducing outside air into the engine housing 2 and has an inlet opening 101A and an outlet opening 101B. The inlet opening 101A of the intake duct 101 is connected to a downstream side of the aftercooler 6 in the intake path 3, as shown in Fig. 1 shown, connected. The outlet opening 101B of the intake manifold 101 is connected to the one shown in Fig. The intake duct 101 is connected to the side of the engine housing 2 shown in Figure 1. In this way, the outside air flows from the aftercooler 6 towards the engine housing 2 through the intake duct 101 of the mixing port 100. The intake duct 101 can, for example, be located in an intermediate section of the intake path 3, or it can be located between the intake path 3 and the intake port 7.

[0023] For example, the intake duct 101 can be designed linearly. As in Fig. 5 and Fig. As shown in Figure 6, the intake duct 101, according to the present embodiment, is bent longitudinally at an intermediate section of the intake duct 101. In particular, the intake duct 101 has an upstream duct 111, a downstream duct 112 extending in a different direction than the upstream duct 111, and a bent duct 113 connecting the upstream duct 111 and the downstream duct 112.

[0024] The upstream channel 111 comprises an inlet opening 101A of the intake channel 101. The downstream channel 112 is arranged on the downstream end face of the upstream channel 111 and comprises the outlet opening 101B of the intake channel 101. In the illustrated example, the length of the downstream channel 112 is shorter than the length of the upstream channel 111. However, the present invention is not limited to this. The upstream channel 111 and the downstream channel 112 each extend linearly. The upstream channel 111 and the downstream channel 112 can intersect at any desired angle. In the present embodiment, they are perpendicular to each other.In the illustrated example, the upstream channel 111 extends in a Z-axis direction, and the downstream channel 112 extends in an X-axis direction perpendicular to the Z-axis direction. The curved channel 113 can be at least one curved channel. The curved channel 113 according to the present embodiment is curved to connect the upstream channel 111 and the downstream channel 112 uniformly.

[0025] The intake channel 101 according to the present embodiment has a tapered shape, the flow path cross-section of which decreases from the inlet opening 101A towards the outlet opening 101B. In particular, the upstream channel 111 is conical.

[0026] The heater 102 is located in the inlet opening 101A of the intake duct 101. The heater 102 warms the outside air when the outside air temperature is low. This prevents the outside air from entering the combustion chamber 2A (see figure) at an excessively low temperature. Fig. 1) of the motor housing 2 is initiated.

[0027] As in Fig. 3, Fig. 4 and Fig. As shown in Figure 8, the EGR channel 103 is a channel for using a portion of the exhaust gas from the engine housing 2 as EGR gas and returning the EGR gas to the intake channel 101. According to the present embodiment, the EGR channel 103 forms a downstream end section of the previously described EGR path 10 (see Figure 8). Fig. 1) A plurality (in the illustrated example 2) of inlet openings 103A of the EGR channel 103, which is connected to the EGR path 10, can, as in Fig. 2 and Fig. 3 shown, provided for. However, for example, an inlet opening 103A may be formed. The one in Fig. Figure 3 shows an EGR channel 103 with a tapered shape, the cross-sectional area of ​​which decreases from the inlet opening 103A towards the side of the intake channel 101. However, the present invention is not limited to this.

[0028] As in Fig. 3, Fig. 4 and Fig. As shown in Figure 8, in the merging section 104, the EGR channel 103 is connected longitudinally to the intermediate section of the intake channel 101 such that the longitudinal directions of the intake channel 101 and the EGR channel 103 intersect. According to the present embodiment, the merging section 104 connects the EGR channel 103 to the intermediate section of the intake channel 101 such that the longitudinal directions of the intake channel 101 and the EGR channel 103 are perpendicular to each other. The merging section 104 comprises a downstream end of the EGR channel 103, which is open on the inner surface of the intake channel 101. The downstream end of the EGR channel 103 is an inlet opening 104A for the EGR gas supplied to the intake channel 101. In the following description, the downstream end of the EGR channel 103 can optionally also be referred to as the inlet opening 104A of the merging section 104.

[0029] As in Fig. 5 and Fig. As shown in Figure 7, the merging section 104 (in particular the inlet section 104A) is arranged on an upstream end face of the downstream channel 112, which is provided on the side of the curved channel 113 in the longitudinal direction of the downstream channel 112. Furthermore, according to the present embodiment, a section of the merging section 104 (in particular the inlet opening 104A) is also provided in a downstream end face of the curved channel 113, which is arranged on the downstream end face of the downstream channel 112. In a Fig. In the direction shown in Figure 5 (Y-axis direction), the joining section 104 is provided on a back side of a projection section 105 (as described later).

[0030] Furthermore, as in Fig. 4 and Fig. Figure 5 shows the inlet opening 104A of the merging section 104 according to the present embodiment in a region between an inner region 112A of the downstream channel 112, which corresponds to the inside of the curved channel 113 in the radial direction, and an outer region 112B of the downstream channel 112, which corresponds to the outside of the curved channel 113 in the radial direction, in the circumferential direction of the inner surface of the downstream channel 112, on the inner surface of the downstream channel 112. In this way, one direction in which the EGR gas flows into the intake channel 101 from the EGR channel 103 is essentially one direction (Y-axis direction in Fig. 5), which are essentially perpendicular to the longitudinal direction (X-axis direction in Fig. 5) of the downstream channel 112 and in the radial direction (Z-axis direction in Fig. 5) of the curved channel 113 in the downstream end of the curved channel 113.

[0031] As in Fig. As shown in Figure 8, the inner surface of the intake duct 101 comprises an upstream area 116, which is arranged on the opposite wall surface 115, forming the inner surface, from the merging section 104 on the side of the inlet opening 101A of the intake duct 101 and on one side opposite the merging section 104 (in particular the inlet opening 104A) in the direction (the Z-axis direction in Fig. 8) is arranged perpendicular to the longitudinal direction of the intake duct 101. The upstream region 116 according to the present embodiment forms the inner surface of the upstream channel 111 of the intake duct 101.

[0032] The upstream section 116 comprises a first wall surface 116A, a second wall surface 116B, and a third wall surface 116C. The first wall surface 116A and the second wall surface 116B are arranged at a distance, in this order, from the side of the merging section 104 towards the inlet opening 101A in the longitudinal direction of the intake duct 101. The third wall surface 116C projects inwards from the first wall surface 116A (radially inwards in the direction of the intake duct 101) between the first wall surface 116A and the second wall surface 116B.

[0033] According to the present embodiment, the third wall surface 116C is an inclined surface that extends in the longitudinal direction of the intake duct 101 towards the inlet opening 101A when the third wall surface 116C extends inwards from the first wall surface 116A from one end on the side of the inlet opening 101A of the first wall surface 116A. Thus, the first wall surface 116A and the third wall surface 116C extend continuously along a curved surface. Similarly, the second wall surface 116B and the third wall surface 116C extend continuously along a curved surface. That is, the first wall surface 116A and the third wall surface 116C are uniformly / seamlessly connected to each other, and the second wall surface 116B and the third wall surface 116C are uniformly / seamlessly connected.

[0034] Furthermore, according to the present embodiment, the second wall surface 116B is arranged within the first wall surface 116A. The first wall surface 116A and the second wall surface 116B can be arranged parallel in the longitudinal direction of the intake duct 101, as shown in the illustrated example. However, the present invention is not limited to this. Additionally, an upstream-facing region 117, which faces the first to third wall surfaces 116A to 116C in the radial direction of the intake duct 101 on the inner surface of the intake duct 101, is curved such that the distance from the second wall surface 116B is greater than the distance from the first wall surface 116A. In this way, the intake duct 101 (in particular the upstream duct 111) can be conically shaped.

[0035] As in Fig. As shown in Figures 4 to 6, the mixing port 100 according to the present embodiment further comprises the projecting section 105. The projecting section 105 extends in a negative Z-axis direction from the inner region 112A towards the outer region 112B of the downstream channel 112. As shown in Fig. As shown in Figure 7, the projecting section 105 is arranged between the merging section 104 (inlet opening 104A) and an adjacent area 118, which faces the merging section 104 (inlet opening 104A) on the opposite wall surface 115 of the intake duct 100. The projecting section 105 is positioned at a distance along the Y-axis from both the adjacent area 118 and the inlet opening 104A of the merging section 104.

[0036] As in Fig. As shown in Figures 4 to 6, a gap is formed between a tip of the projecting section 105 in a projection direction and the outer area 112B of the downstream channel 112. That is, the tip of the projecting section 105 does not reach the outer area 112B of the downstream channel 112. The projection length of the projecting section 105 according to the present embodiment is approximately half the length from the inner area 112A to the outer area 112B. However, the present invention is not limited to this.

[0037] For example, the projecting section 105 can face the entire inlet opening 104A of the merging section 104 when viewed in a direction (Y-axis direction) in which the projecting section 105 and the inlet opening 104A of the merging section 104 are aligned, as shown in Fig. Figure 5 shows the following. However, according to the present embodiment, the projecting section 105 faces a section of the inlet opening 104A of the merging section 104. In particular, the projecting section 105 faces a section of the inlet opening 104A that is closer to the inner region 112A of the downstream channel 112 and does not face the region that is near the outer region 112B of the downstream channel 112. In this way, the flow of the EGR gas flowing from the EGR channel 103 to the section that is closer to the inner region 112A of the downstream channel 112 is blocked by the projecting section 105. On the other hand, a flow of EGR gas flowing from the EGR channel 103 to the section located near the outer section 112B in the downstream channel 112 is not blocked by the projecting section 105 and reaches the facing section 118 (see figure). Fig. 4).

[0038] As in Fig. 5 and Fig. As shown in Figure 6, an end section 105A, provided on the downstream side of the intake duct 101 in the projection section 105, is inclined from the upstream duct 101 towards the downstream duct 112 (i.e., towards the outlet opening 101B of the intake duct 101), since the end section is directed towards the tip from the base section of the projection section 105 in the direction of projection. An upstream end section 105A of the projection section 105 can be provided at an upstream end of the downstream duct 112, as shown in the illustrated example. Alternatively, for example, the upstream end section 105A can be arranged on the downstream side at a distance from the upstream end of the downstream duct 112.On the other hand, a downstream end section 105B of the projection section 105 can be arranged in the outlet opening 101B of the intake duct 101, as shown in the illustrated example. Alternatively, the downstream end section 105B can be arranged on the upstream side of the downstream duct 112 at a distance from the outlet opening 101B of the intake duct 101.

[0039] The projecting section 105 can be formed in any desired shape. According to the present embodiment, the projecting section 105 is formed in a plate shape, in which an orientation direction (the Y-axis direction) is defined. Fig. 4 and Fig. 8) of the projecting section 105 and the inlet opening 104A of the merging section 104 onto a plate thickness direction according to the Fig. 4 and Fig. It is set to 8.

[0040] As in Fig. As shown in Figures 4 and 6 to 8, a recessed section 120, which is formed in the recess of the opposite wall surface 115, is formed in the area 118 facing the opposite wall surface 115 of the intake duct 101. According to the present embodiment, the recessed section 120 is formed in the upstream end section of the downstream duct 112 in the area 118 facing the intake duct. Furthermore, according to the present embodiment, the recessed section 120 is designed such that it extends to the downstream end section of the curved duct 113 (see in particular Figures 4 and 6 to 8). Fig. 6 and Fig. 7) The inner surface of the recessed section 120 can be formed in any desired shape. However, according to the present embodiment, as shown in Fig. Figure 8 shows the inner surface in a uniformly curved arc shape in a cross-section perpendicular to the longitudinal direction (X-axis direction) of the downstream channel 112. <Effekt während des Betriebs>

[0041] In the mixing port 100 according to the present embodiment, which is designed as before, the EGR gas flowing from the EGR channel 103 into the intake channel 101 flows essentially from the inlet opening 104A of the merging section towards the facing section 118 on the opposite wall surface 115, which faces the inlet opening 104A, as shown in Fig. Figure 8 shows that the flow of EGR gas into intake port 101 is partially blocked by the projecting section 105. This means that the EGR gas flowing into intake port 101 is partially attenuated by the projecting section 105. In this way, backflow of EGR gas from the merging section 104 towards the inlet opening 101A of intake port 101 can be suppressed. An arrow F1 in Fig. Figure 8 shows an example of the flow of the EGR gas that is blocked by the protrusion section 105.

[0042] Furthermore, a partial flow of the EGR gas, which flows from the EGR channel 103 into the intake channel 101, passes through the gap between the tip of the projecting section 105 and the outer surface 112B of the downstream channel 112 and reaches the facing section 118, which faces the inlet opening 104A of the merging section 104. Here, the recessed section 120 is formed in the facing section 118. Accordingly, the EGR gas partially flows into the recessed section 120. Thus, the EGR gas can be contained within the recessed section 120. In this way, it is possible to suppress the backflow of the EGR gas from the merging section 104 towards the inlet opening 101A of the intake channel 101. An arrow F2 in Fig. Figure 8 shows an example of the flow of the EGR gas that remains in section 120.

[0043] In some cases, a portion of the EGR gas reaching the facing area 118 on the opposite wall surface 115 may flow towards the inlet opening 101A of the intake duct 101 along the first wall surface 116A of the opposite wall surface 115, which is located on the upstream side of the facing area 118. In this case, the flow direction of the EGR gas flowing along the first wall surface 116A is modified by the third wall surface 116C, which projects inwards from the first wall surface 116A. Specifically, due to the third wall surface 116C, the flow components of the EGR gas flowing towards the inlet opening 101A decrease, and the flow components of the EGR gas flow inwards in the radial direction of the upstream inner surface. This means that the flow of the EGR gas, which flows towards the inlet opening 101A, is weakened by the third side wall 116C.This makes it less likely that the EGR gas will reach the inlet opening 101A and the heater 102 of the intake manifold 101. An arrow F3 in . Fig. Figure 8 shows an example of the EGR gas being attenuated by the third side wall surface 116C.

[0044] Furthermore, in the mixing port 100 according to the present embodiment, as shown in Fig. Figure 5 shows the outside air flowing sequentially from the inlet opening 101A of the intake duct 101 through the upstream duct 111, the curved duct 113, and the downstream duct 112 into the outlet opening 101B. Thus, in the curved duct 113, the flow velocity of an outside air flow F41, which flows radially outwards, is faster than the flow velocity of an outside air flow F42, which flows radially inwards. Furthermore, the projecting section 105 is located in a region corresponding to the inside of the curved duct 113 in the radial direction in the downstream duct 112, and not in a region corresponding to the outside of the curved duct 113 in the radial direction.Thus, the flow F41 of outside air, which is fast in the radial direction outside the curved channel 113, reaches the outlet opening 101B of the intake channel 101 without being blocked by the protruding section 105 and without reducing the flow velocity.

[0045] On the other hand, the projecting section 105 blocks the flow of the EGR gas flowing into the intake duct 101 in a region (i.e., a region where the flow velocity of the outside air is slow) corresponding to the inside of the curved channel 113 in the radial direction in the downstream channel 112 (see in particular arrow F1 in Fig. 8) Thus, the flow velocity of the EGR gas entering the intake duct 101 can be effectively reduced. In this way, the flow F41 of the outside air, which is fast in the radial direction outside the curved duct 113, is not disturbed or is less likely to be disturbed by the flow of the EGR gas entering the intake duct 101. In a region corresponding to the inside of the curved duct 113 in the radial direction, where the flow velocity of the outside air is slow, the EGR gas, whose flow velocity is reduced by the projecting section 105, is sufficiently mixed with the outside air, which has a slow flow velocity.

[0046] The EGR gas, whose flow velocity is reduced by the projecting section 105, moves with the flow F41 of the outside air, which is fast in the radial direction outside the curved channel 113. In this way, the EGR gas flows from the outlet opening 101B of the intake duct 101 together with the outside air towards the engine housing 2 at a high flow velocity.

[0047] As previously described, according to the mixing port 100 and the motor 1 of the present embodiment, the first wall surface 116A, the third wall surface 116C, and the second wall surface 116B are oriented sequentially from the side of the merging section 104 towards the inlet opening 101A in the upstream region 116 of the opposite wall surface 115 of the intake duct 101, which is provided on the side opposite the merging section 104. The third wall surface 116C projects inwards from the first wall surface 116A. Thus, even if the EGR gas flowing into the intake duct 101 flows backwards in the merging section 104 towards the inlet opening 101A along the first side wall surface 116A, the flow direction of the EGR gas can be changed by the third wall surface 116C. In this way it is possible to prevent the EGR gas from reaching the inlet opening 101A of the intake manifold 101.This prevents the soot contained in the EGR gas from adhering to the heater 102 located in the inlet opening 101A, and makes it possible to compensate for a reduction in the performance of the heater 102.

[0048] Furthermore, according to the mixing connection 100 of the present embodiment, the third wall surface 116C is an inclined surface. The first wall surface 116A and the third wall surface 116C are arranged uniformly and continuously relative to each other on the curved surface, and the second wall surface 116B and the third wall surface 116C are arranged uniformly and continuously relative to each other on the curved surface. Thus, based on the first to third wall surfaces 116A to 116C, it is possible to prevent the occurrence of a pressure loss in the outside air flowing into the intake duct 101 (in particular the upstream duct 111).

[0049] Furthermore, according to the mixing port 100 of the present embodiment, the projecting section 105, which is provided on the inner surface of the downstream channel 112, is arranged such that it weakens the flow of the EGR gas flowing into the intake channel 101 from the inlet opening 104A of the merging section 104. Moreover, the projecting section 105 is arranged such that it does not block the flow F41 of the outside air, which is fast in the radial direction outside the curved channel 113. Thus, the outside air can flow from the outlet opening 101B of the intake channel 101 towards the engine housing 2 at a high flow velocity.Furthermore, the EGR gas, whose flow velocity is reduced by the projecting section 105, flows along (on) the flow F41 of the ambient air, which is fast-flowing in the radial direction outside the curved channel 113, and can flow from the outlet opening 101B of the intake duct 101 towards the engine housing 2 together with the fast-flowing ambient air. In this way, the EGR gas with its high specific gravity can be reliably directed into the combustion chamber 2A of the engine housing 2, where the EGR gas is caused to flow on / along the fast-flowing ambient air. Moreover, as in the intake manifold 7 according to the present embodiment, even if the lengths of the plurality of paths from the inlet to the respective combustion chambers 2A differ, the EGR gas can be supplied equally to all combustion chambers 2A by causing the EGR gas to move along the fast-flowing ambient air.This means that mixed gas with the same EGR gas concentration can be supplied to all combustion chambers 2A of the engine housing 2.

[0050] Furthermore, according to the mixing port 100 of the present embodiment, the downstream end section 105A of the projection section 105 is inclined from the upstream channel 111 towards the downstream channel 112, since the upstream end section 105A is directed from the base end of the projection section 105 towards the tip in the projection direction. Therefore, the projection section 105 makes it possible to reduce the pressure loss of the outside air flowing in the intake channel 101 (especially the outside air flowing inwards in the radial direction of the curved channel 113). That is, it prevents the flow of outside air in the intake channel 101 from being weakened by the projection section 105.

[0051] Furthermore, according to the mixing port 100 of the present embodiment, the recessed section 120 is formed in the adjacent section 118, which faces the merging section 104 on the inner surface of the intake duct 101. In this way, the EGR gas flowing from the inlet opening 104A of the merging section 104 into the intake duct 101 can remain in the recessed section 120. This suppresses the backflow of the EGR gas from the merging section 104 towards the inlet opening 101A of the intake duct 101. Consequently, it is even more effectively prevented that the soot contained in the EGR gas adheres to the heater 102, which is arranged in the inlet opening 101A.

[0052] The backflow of EGR gas from the merging section 104 towards the inlet opening 101A of the intake manifold 101 is likely to occur in the engine 1 with three combustion chambers 2A (number of cylinders), as in the present embodiment. Therefore, the mixing port 100 according to the present embodiment, which can suppress the backflow of the EGR gas, is particularly effective for the three-cylinder engine, as in the present embodiment. <Weitere Ausführungsformen>

[0053] The embodiment according to the present invention has been described so far. However, the present invention is not limited to this and can be modified appropriately without deviating from the scope of the technical idea of ​​the present invention.

[0054] In the mixed connection according to the present invention, in a case where the second wall surface 116B is arranged within the first wall surface 116A, the third wall surface 116C, which is provided between the first wall surface 116A and the second wall surface 116B, can be a stepped surface that connects the first wall surface 116A and the second wall surface 116B, for example, in a stepped manner. More precisely, the third wall surface 116C can be perpendicular to the first wall surface 116A. Furthermore, the third wall surface 116C, which is located between the first wall surface 116A and the second wall surface 116B, can be configured such that it includes, for example, a projection that extends inwards from the first wall surface 116A and the second wall surface 116B. In this case, the second wall surface 116B can be arranged within the first wall surface 116A, as in the embodiment described above. However, the present invention is not limited to this.

[0055] In the mixing port according to the present invention, the projecting section 105 can extend towards the inner region 112A from the outer region 112B of the downstream channel 112. Even in this case, the flow of the EGR gas flowing from the EGR channel 103 into the intake channel 101 can be slowed down by the projecting section 105 (the flow velocity can be reduced). Thus, it can be prevented that the EGR gas reaches the heater 102.

[0056] In the mixed connection according to the present invention, the inlet opening 104A of the merging section 104 can, for example, be open in the outer area 112B or in the inner area 112A on the inner surface of the downstream channel 112.

[0057] In the mixing port according to the present invention, for example, the EGR channel 103 can be connected to the intermediate section of the intake port 101 in the merging section 104, such that it extends in the longitudinal direction of the intake port 101, since the EGR channel 103 is arranged radially to the intake port 101 at a distance from it. In this case, the direction in which the EGR gas flows from the EGR channel 103 into the intake port 101 can include a component in a direction towards the downstream side of the intake port 101. In this way, compared to the merging section 104, the backflow of the EGR gas flowing towards the upstream side of the intake port 101 can be prevented.

[0058] The engine according to the present invention can be applied to any work vehicle, such as a dump truck, a hydraulic excavator, a bulldozer, a floor planer and a crane. Reference symbol list 1 engine 2 Motor housings 3 Intake path 7 Intake manifolds 8 Extraction path 9 extraction ports 10 EGR path 100 mixed connection 101 Intake manifold 101A Inlet 101B Outlet 102 Heating 103 EGR channel 104 Merger section 105 Lead section 105A upstream end face of the projection section 105 111 upstream channel 112 downstream channel 112A Indoor 112B Outdoor area 113 curved channel 115 opposite wall surface 116 upstream area 116A first wall surface 116B second wall surface 116C third wall surface 118 facing area 120 In-depth section< / mischanschluss> < / motor>

Claims

[1] Mixing port (100), comprising: an intake duct (101) for introducing outside air into an engine housing (2); an EGR channel (103) which takes in a portion of the exhaust gas expelled from the engine housing (2) for use as EGR gas and returns the EGR gas to the intake channel (103); and a merging section (104) that connects the EGR channel (103) with an intermediate section of the intake channel (101) in the longitudinal direction, so that the longitudinal directions of the intake channel (101) and the EGR channel (103) intersect, wherein an upstream region (116), which is arranged on one side of the inlet opening (101A) of the intake duct (101) from the merging section (104) on an opposite wall surface (115) forming an inner surface of the intake duct (101) and is arranged on a side opposite the merging section (104) in a direction perpendicular to the longitudinal direction of the intake duct (101), comprises a first wall surface (116A) and a second wall surface (116B) arranged successively at a distance from the side of the merging section (104) in the direction of the inlet opening (101A) in the longitudinal direction of the intake duct (101), and a third wall surface (116C) projecting inwards from the first wall surface (116A) between the first wall surface (116A) and the second wall surface (116B), wherein the first wall surface (116A) and the third wall surface (116C) are continuously connected to each other, and the second wall surface (116B) and the third wall surface (116C) are continuously connected to each other. [2] Mixing connection (100) according to claim 1, wherein the third wall surface (116C) is an inclined surface which is inclined such that it extends in the direction of the inlet opening (101A) when the inclined surface extends inwards from an end of the first wall surface (116A) on the side of the inlet opening (101A), and wherein the first wall surface (116A) and the third wall surface (116C) are continuously connected to each other on a curved surface, and the second wall surface (116B) and the third wall surface (116C) are continuously connected to each other on a curved surface. [3] Mixing connection (100) according to claim 1 or 2, wherein the intake duct (101) comprises an upstream duct (111) having the inlet opening (101A), a downstream duct (112) located on a downstream end face of the upstream duct (111) and extending in a direction different from a direction of the upstream duct (111), and a curved duct (113) connecting the upstream duct (111) and the downstream duct (112), wherein the merging section (104) is arranged at least in an upstream end section of the downstream channel (112) which is located on the side of the curved channel (113), wherein the mixing port (100) comprises a projecting section (105) which extends radially from an inner area corresponding to an inner surface (113A) of the curved channel (113) onto an inner surface of the downstream channel (112) and which is arranged between the merging section (104) and a region (118) facing the merging section (104) on the opposite wall surface (115) such that it is opposite the merging section (104), and wherein a gap is formed between a tip of the projection section (105) in a projection direction and an outer area (112B) facing the interior on the inner surface of the downstream channel (112). [4] Mixing connection (100) according to claim 3, wherein an upstream end section (105A) of the projection section (105) is inclined from the upstream channel (111) in the direction of the downstream channel (112), since the upstream end section (105A) is directed from a base end to a tip of the projection section (105) in the projection direction. [5] Mixing connection (100) according to one of claims 1 to 4, wherein a recessed section (120) which is formed recessed from the opposite wall surface (115) is formed in an approaching area (118) which faces the joining section (104) on the opposite wall surface (115). [6] Mixing port (100), comprising: an intake duct (101) for introducing outside air into an engine housing (2); an EGR channel (103) which takes in a portion of the exhaust gas expelled from the engine housing (2) for use as EGR gas and returns the EGR gas to the intake channel (101); and a merging section (104) that connects the EGR channel (103) with an intermediate section of the intake channel (101) in the longitudinal direction, so that the longitudinal directions of the intake channel (101) and the EGR channel (103) intersect, wherein the intake duct (101) comprises an upstream duct (111) which is an inlet opening (101A) of the intake duct (101), a downstream duct (112) which is located on a downstream end face of the upstream duct (111) and extends in a different direction than the upstream channel (111), and has a curved channel (113) connecting the upstream channel (111) and the downstream channel (113), wherein the merging section (104) is arranged at least in an upstream end section of the downstream channel (112) which is located on the side of the curved channel (113), wherein the mixing port (100) comprises a projecting section (105) which extends radially from an inner area (112A) corresponding to an inner surface of the curved channel (113) onto an inner surface of the downstream channel (112) and which is facing the merging section (104) by being arranged between the merging section (104) and an facing area (118), wherein the facing area (118) is facing the merging section (104) and is arranged on a side opposite the merging section (104) in a direction perpendicular to the longitudinal direction of the intake duct (101), and wherein a gap is formed between a tip of the projection section (105) in a projection direction and an outer area (112B) facing the interior on the inner surface of the downstream channel (112). [7] Motor (1), comprising: the mixing port (100) according to any one of claims 1 to 6; and a motor housing (2).

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