JP6138505B2 - Intake device - Google Patents

Description

  The technology of the present disclosure relates to an intake device provided in an engine.

  The engine intake device includes an air cleaner and a turbocharger, and the compressor and the air cleaner of the turbocharger are usually connected by a resin or metal intake pipe. The air intake pipe connecting the air cleaner and the compressor is formed into a two-dimensionally curved line connecting them, thereby enabling the air cleaner and the compressor to be arranged in a predetermined space (for example, Patent Documents). 1).

JP 2010-59834 A

  By the way, since the shape of the curved portion of the intake pipe changes abruptly compared with the substantially straight portion of the intake pipe, the flow of intake air in the intake pipe flows along the inner wall surface of the intake pipe. The flow changes from the inner wall to the inner wall. Therefore, a pressure loss due to the pressure resistance occurs in the flow of intake air, and as a result, the intake efficiency in the turbocharger decreases.

  An object of the technology of the present disclosure is to provide an intake device that can suppress a decrease in intake efficiency in a turbocharger.

One aspect of the intake device according to the technology of the present disclosure includes an air cleaner, a turbocharger having a compressor, and an intake pipe formed in a circular shape that connects the air cleaner and the compressor. The intake pipe is entirely formed in a curved shape projecting at the first vertex in front view, and is entirely formed in a curved shape projecting at the second vertex in side view. The vertex and the second vertex are different from each other. The turbocharger includes a turbine coupled to the compressor, and the compressor includes a housing that houses an impeller that rotates about a rotation shaft. A side opposite to the turbine with respect to the housing is set as a first vertex region, and a radially outer side of the rotating shaft with respect to the housing is set as a second vertex region. The intake pipe includes a connection portion facing the rotation center of the impeller in the housing, extends from the connection portion toward the first vertex region, and passes through the second vertex region from the connection portion. Curves to the turbine side relative to the housing. The first vertex is disposed on the opposite side of the turbine relative to the housing and radially inward of the rotational axis relative to the housing; the second vertex is opposite the turbine relative to the housing; and The first apex is arranged closer to the connecting portion than the second apex, and is arranged on the outer side in the radial direction of the rotating shaft with respect to the housing.

  When the intake pipe is a two-dimensionally curved line, that is, all of the intake pipe is included in one plane intersecting both the front and side surfaces, and the intake pipe is curved in the plane. Even when the air intake is in the shape of the intake pipe, both the front view and the side view are curved. On the other hand, in the intake pipe formed in a two-dimensionally curved line, the apex in front view coincides with the apex in side view. On the other hand, according to one aspect of the intake device in the technology of the present disclosure, the shape of the intake pipe is curved in both the front view and the side view, and the apex in the front view and the apex in the side view are These are different sites. Therefore, the curvature of the intake pipe can be set larger than that of the intake pipe curved in one plane, that is, the intake pipe extending in two dimensions or a combination of such intake pipes. Separation is less likely to occur in the flow of intake air. Therefore, a reduction in intake efficiency in the turbocharger can be suppressed.

Further , according to one aspect of the intake device in the technology of the present disclosure, the intake pipe extends from the rotation center of the impeller toward the first vertex region, and passes through the second vertex region from the rotation center of the impeller, and the turbine for the housing The intake pipe is curved to the side. Therefore, a radius of curvature that is more than half the radius of rotation of the impeller is ensured in the intake pipe in the first apex region. In addition, the first vertex region,
Each of the second vertex areas is an area that is rotationally symmetric with respect to the rotation center of the impeller, and the first vertex and the second vertex are separately arranged in the two areas that are rotationally symmetric. As a result, since the position where the intake pipe is arranged is selected from the entire range along the direction in which the impeller rotates, the degree of freedom of arrangement of the intake pipe can be increased. As a result, it is possible to increase the degree of freedom of arrangement of other members constituting the intake device, constituent members of the engine, or members constituting the auxiliary machinery of the engine.

  In another aspect of the intake device according to the technology of the present disclosure, the connection portion is set as a first connection portion, and the intake pipe includes a second connection portion connected to the air cleaner. The intake pipe is formed in a semicircular arc shape in which a portion from the first connection portion to the second vertex projects from the first vertex in a front view, and the first connection portion in a side view. To the second connecting portion is formed in a subarc shape.

  According to another aspect of the intake device in the technology of the present disclosure, a portion from the first connection portion to the second vertex is formed in a semicircular arc shape, and a portion from the first connection portion to the second connection portion is inferior. Since it is formed in an arc shape, the radius of curvature in the intake pipe can be suppressed from rapidly decreasing in the vicinity of the first connection portion. As a result, it is possible to suppress a rapid separation of the air flow in the vicinity of the inlet of the intake air to the compressor.

  In another aspect of the intake device according to the technology of the present disclosure, a vertical plane including the rotation shaft is set as a reference plane, the turbine includes an exhaust inlet portion into which exhaust gas is introduced, and the compressor extracts the intake air. An intake outlet is provided. When viewed from the side, the exhaust inlet portion and the intake outlet portion are arranged with the reference plane in between, and the first vertex and the second vertex are arranged on the intake outlet side with respect to the reference plane.

  According to the other aspect of the intake device in the technology of the present disclosure, the first vertex and the second vertex are arranged on the intake outlet side with respect to the reference plane, so that the path of the intake system is the exhaust system with respect to the reference plane. Are arranged together on the opposite side. Since various sensors for measuring the intake air temperature and the intake pressure are attached to the intake system, it becomes easy to collectively arrange the sensors required for the intake system.

Another aspect of the intake device in the art of the present disclosure, prior Symbol intake pipe, the portion from the front Kise' connection portion to said second vertex, with the same internal diameter.
In circular tubes having different inner diameters, separation tends to occur in the flow of air from a portion having a relatively small inner diameter to a portion having a relatively large inner diameter. In this regard, according to another aspect of the intake system of the present disclosure, because the inner diameter from the connecting section to a second vertex is the same, between the connection part to the second vertex, i.e., the first vertex It is possible to suppress the separation of the air flow in the portion that protrudes at the end. Therefore, it is possible to suppress separation of the air flow immediately before the intake air inlet of the compressor.

It is a figure showing a schematic structure of an engine provided with an intake device in one embodiment of the art of this indication. It is a front view which shows the front view structure of a 1st intake pipe and a turbocharger. It is a side view which shows the side view structure of a 1st intake pipe and a turbocharger. It is a conceptual diagram which shows notionally the structure of a 1st intake pipe on a three-dimensional coordinate. It is a front view which shows the front view structure of the 1st intake pipe and turbocharger in a test example. It is a side view which shows the side view structure of the 1st intake pipe and turbocharger in a test example. It is a figure which shows distribution of the pressure of the intake air which flows in the 1st intake pipe of an Example. It is a figure which shows distribution of the pressure of the intake air which flows in the 1st intake pipe of a test example. It is a figure which shows distribution of the flow velocity of the intake air which flows in the 1st intake pipe of an Example. It is a figure which shows distribution of the flow velocity of the intake air which flows in the 1st intake pipe of a comparative example.

An embodiment of an intake device will be described with reference to FIGS. Below, it demonstrates in order of schematic structure of an engine provided with an intake device, detailed structure of an intake device, and a test example.
[Schematic configuration of the engine]
As shown in FIG. 1, a plurality of cylinders 12 are formed in a cylinder block 11 of the engine 10, and an intake device 20 and an exhaust device 30 face each other across the direction in which the cylinders 12 are arranged. Mounted in position.

  The intake device 20 includes an air cleaner 21 and a compressor housing 41a that constitutes the compressor 41 of the turbocharger 40 in order from the introduction side of the intake air IA. It is connected. A second intake pipe 23 and an intake manifold 24 in which a connection portion between the cylinder block 11 branches into a plurality of passages are sequentially connected to the compressor housing 41a. In the middle of the second intake pipe 23, an intercooler 25 that constitutes an intake passage together with the second intake pipe 23 is attached.

  The exhaust device 30 includes, in order from the engine 10 side, an exhaust manifold 31 in which a connection portion with the cylinder block 11 branches into a plurality of passages, and a first exhaust pipe 32. A turbine housing 42a constituting the turbine 42 of the turbocharger 40 is connected to the end of the first exhaust pipe 32 opposite to the engine 10, and the second exhaust pipe 33 is also connected to the turbine housing 42a. .

  Impellers 41 b and 42 b are accommodated in each of the compressor housing 41 a and the turbine housing 42 a of the turbocharger 40, and the two impellers 41 b and 42 b are connected by a rotating shaft 43. Thereby, in the turbocharger 40, the compressor 41 and the turbine 42 are connected by the rotating shaft 43. Each of the two impellers 41b and 42b rotates around the rotation shaft 43 in each housing 41a and 42a.

  In the engine 10, the intake air IA taken from the air cleaner 21 is supplied into the engine 10 through the first intake pipe 22, the second intake pipe 23, and the intake manifold 24, and the intake air IA is fuel in the cylinder 12. Used for combustion. At this time, the impeller 42b of the turbine 42 is rotated by the exhaust gas EA generated by the combustion, whereby the impeller 41b of the compressor 41 is rotated and the intake air IA in the compressor 41 is compressed. The compressed air CA is supplied to the engine 10 with the temperature lowered by the intercooler 25. Therefore, according to the engine 10 described above, the amount of air supplied into the cylinder 12 is increased compared to an engine in which the turbocharger 40 is not mounted. As a result, the output of the engine 10 is increased.

[Detailed configuration of intake system]
With reference to FIGS. 2 to 4, a detailed configuration of the intake device 20, particularly, a detailed configuration of the first intake pipe 22 will be described. 2 and 3, for convenience of illustration, an air cleaner 21 connected to the first intake pipe 22, a second intake pipe 23 connected to the compressor 41, and a second exhaust pipe connected to the turbine 42 are shown. 33 is omitted. Further, the first intake pipe 22 is shaded for the sake of convenience in understanding the three-dimensional structure of the first intake pipe 22.

  As shown in FIG. 2, the first intake pipe 22 is a circular tube that connects a compressor 41 formed in a substantially cylindrical shape extending in the left-right direction on the paper surface and an air cleaner 21 (not shown) disposed on the upper side of the paper surface. Is formed. For example, various metals are used as a material for forming the first intake pipe 22. The first intake pipe 22 has a first connection portion 22 a connected to the compressor 41 at an end portion close to the compressor 41, and a second connection portion 22 b connected to the air cleaner 21 at an end portion close to the air cleaner 21. Is formed. The first connecting portion 22a is disposed at a position facing the central axis C serving as the rotation center of the impeller 41b, that is, the axis of the rotation shaft 43 in the compressor housing 41a constituting the compressor 41.

  The compressor 41 is connected to a rotation shaft 43 formed in a columnar shape extending along the left-right direction on the paper surface on the opposite side of the compressor 41 from the first connection portion 22a. The intake outlet 41 c of the compressor 41 is formed in a circular tube shape extending in a direction away from the turbine 42 along a direction parallel to the rotation shaft 43. The intake outlet 41c guides the intake air pressurized in the compressor 41 toward the second intake pipe 23.

  On the opposite side of the rotary shaft 43 from the compressor 41, a turbine 42 formed in a columnar shape that extends in the left-right direction of the paper surface is connected. An exhaust outlet 42 c is attached to the turbine 42 on the opposite side of the rotating shaft 43 with respect to the turbine 42, and the exhaust outlet 42 c is formed in a circular tube shape and connected to the second exhaust pipe 33.

  In the following, the extending direction of the rotating shaft 43 is set as the axial direction Da, and the radial direction of the rotating shaft 43 is set as the radial direction Dr. Further, the turbine 42 side in the axial direction Da with respect to the compressor housing 41a is set as the axially inner side S1i, and the side opposite to the turbine 42 is set as the axially outer side S1o. At this time, the connection surface to which the first connection portion 22a is connected in the compressor housing 41a is a boundary surface between the axially inner side S1i and the axially outer side S1o.

  Furthermore, in the radial direction Dr, the inner side from the outer edge of the compressor housing 41a is set as the radial inner side S2i, and the outer side of the outer edge of the compressor housing 41a is set as the radial outer side S2o. At this time, the outer peripheral surface in the compressor housing 41a becomes a boundary surface between the inner side and the outer side in the radial direction.

  The entire first intake pipe 22 is formed in a curved shape that protrudes from the left to the right of the drawing when viewed from the front, that is, when viewed from the front of the drawing in FIG. It protrudes most in the 1st vertex P1 arrange | positioned at the 1st vertex area | region which is the area | region of axial direction outer side S1o. Similarly, in the front view, the first intake pipe 22 is formed in a semicircular arc shape in which a portion from the first connection portion 22a to the second vertex P2 projects toward the right side of the paper surface at the first vertex P1. The second vertex P2 is arranged in the second vertex region that is the region on the radially outer side S2o.

  As described above, the first intake pipe 22 extends from the rotation center of the impeller 41b to the axially outer side S1o in the front view, and passes through the radial outer side S2o from the rotation center of the impeller 41b to the compressor housing 41a side. It is curved until. Therefore, in the first intake pipe 22, a radius of curvature that is more than half of the radius of the impeller 41b is secured.

  In the first intake pipe 22, it is preferable that a portion from the first connection portion 22a to the second vertex P2 has the same inner diameter. If the portion from the first connecting portion 22a to the second vertex P2 is a circular tube with a changing inner diameter, separation occurs in the flow of air from a portion having a relatively small inner diameter to a portion having a relatively large inner diameter. It tends to occur. On the other hand, in the case of a circular pipe whose inner diameter does not change, the flow of air between the first connecting portion 22a and the second vertex P2, that is, at the portion of the first intake pipe 22 that protrudes at the first vertex P1. Peeling is less likely to occur. Therefore, separation of the air flow is less likely to occur immediately before the intake air inlet in the compressor 41.

  As shown in FIG. 3, the entire first intake pipe 22 protrudes from the right side to the left side of the paper surface when viewed from the side, that is, when viewed from the front side to the back side in FIG. 3. It is formed in a curved shape and protrudes most at the second vertex P2 arranged in the second vertex region that is the region of the radially outer side S2o. In the side view, the first intake pipe 22 is viewed from the right end to the left end in FIG.

  A direction orthogonal to the axial direction Da and the radial direction Dr is set as a protruding direction Dp that is a direction in which the first intake pipe 22 protrudes. In the first intake pipe 22, the first vertex P1 and the second vertex P2 are different from each other in the position in the axial direction Da, the position in the radial direction Dr, and the position in the protruding direction Dp.

  In addition, each of the area | region of axial direction outer side S1o and the area | region of radial direction outer side S2o is an area | region which becomes rotationally symmetrical when the rotating shaft 43 is made into a symmetrical axis. Here, in the above-described first intake pipe 22, the first vertex P1 is disposed on the axially outer side S1o, and the second vertex P2 is disposed on the radially outer side S2o. That is, the position of the first vertex P1 may be an area outside the axial direction S1o, and can be selected from the entire range along the direction in which the impeller 41b rotates. Similarly, the position of the second vertex P2 is The region may be a region on the radially outer side S2o, and can be selected from the entire range along the direction in which the impeller 41b rotates. Therefore, the degree of freedom of the arrangement and shape of the first intake pipe 22 can be increased. As a result, the other members constituting the intake device 20, the constituent members of the engine 10, or the auxiliary equipment of the engine 10 are constituted. The degree of freedom of arrangement of members and the like can also be increased.

  Further, the first intake pipe 22 is also formed in an inferior arc shape in the side view, from the first connection portion 22a to the second connection portion 22b. As described above, the first intake pipe 22 is formed in a semicircular arc shape in which a portion from the first connection portion 22a to the second vertex P2 projects from the first vertex P1 in a front view. After all, the inferior arc shape shown in the side view and the semicircular arc shape shown in the front view are combined, and the radius of curvature of the first intake pipe 22 suddenly increases in the vicinity of the first connecting portion 22a. It can be suppressed from becoming smaller. Therefore, the flow of the intake air in the vicinity of the intake air inlet with respect to the compressor 41 can be prevented from being abruptly separated from the inner peripheral surface of the first intake pipe 22.

A sensor port 22P to which various sensors are attached is formed in the first intake pipe 22 on the way from the first connection portion 22a to the first vertex P1.
As described above, in the first intake pipe 22, the portion from the first connection portion 22a toward the first vertex P1 is directed to the axially outer side S1o and the radially outer side S2o in the region of the radially inner side S2i. Extend. The first intake pipe 22 has a second vertex P2 disposed on the radially outer side S2o across the radially inner side S2i and the radially outer side S2o on the way from the first vertex P1 to the second connecting portion 22b. It passes. In the first intake pipe 22, a portion from the first vertex P1 toward the second connection portion 22b extends toward the axially inner side S1i and the radially outer side S2o in the region of the axially outer side S1o. It extends to the turbine 42 side with respect to the compressor housing 41a.

  Here, a vertical plane including the above-described central axis C and along the central axis C is set as the reference plane A. As described above, the intake port 41c is formed in the compressor 41, and the intake port 41c is arranged on the intake system arrangement side SAi that is on the left side of the reference plane A in the drawing in a side view. Further, the turbine 42 is provided with an exhaust inlet portion 42d formed in a circular tube shape into which exhaust from the first exhaust pipe 32 is introduced. The exhaust inlet portion 42d is arranged on the exhaust system arrangement side SAe that is on the right side of the reference plane A in the turbine 42 in a side view. That is, in the turbocharger 40, the intake outlet portion 41c and the exhaust inlet portion 42d are arranged with the reference plane A interposed therebetween in a side view.

  In the first intake pipe 22, the first vertex P1 is arranged on the left side of the paper surface with respect to the reference plane A in the protruding direction Dp, and the second vertex P2 is paper surface with respect to the first vertex P1 in the protruding direction Dp. It is preferable to arrange | position on the left side of. That is, in the first intake pipe 22, it is preferable that both the first vertex P1 and the second vertex P2 are arranged on the intake outlet 41c side with respect to the reference plane A. With such an arrangement, the intake system path is collectively arranged on the side opposite to the exhaust system with respect to the reference plane A. Therefore, various sensors for measuring the intake temperature and intake pressure attached to the intake system are provided. It becomes easy to arrange together. In other words, such a configuration is preferable for collectively performing operations such as sensor attachment and sensor maintenance and inspection in the intake device 20.

  As described above, the first intake pipe 22 passes through the region on the radially outer side S2o where the second apex P2 is arranged from the first connection portion 22a and the area on the intake system arrangement side SAi in the side view, and the compressor housing 41a Is curved to the turbine 42 side. That is, the shape of the first intake pipe 22 is a portion that is curved in both the front view and the side view, and the apex in the front view and the apex in the side view are different from each other. Therefore, the curvature of the first intake pipe 22 can be set larger than that of the first intake pipe curved in one plane or a combination of the intake pipes. As a result, separation of the intake air flow in the first intake pipe 22 is unlikely to occur, and as a result, a reduction in intake efficiency in the turbocharger 40 can be suppressed.

FIG. 4 is a conceptual diagram showing a shape curved in a plan view orthogonal to each other and conceptually showing the shape of the intake pipe having different vertices in each plan view together with the shape in each plan view.
As shown in FIG. 4, the first intake pipe 22 is visually recognized as a curved shape regardless of whether the first intake pipe 22 is viewed from the front or the side.

  Here, in a configuration in which all of the first intake pipe is included in one plane, for example, the front, when viewed from the front, it is viewed as a curved shape, but when viewed from the side, It is visually recognized as a linear shape. Also, for example, in a configuration in which the first intake pipe is included on the side surface, the shape is a straight shape when viewed from the front, although it is viewed as a curved shape when viewed from the side. As visible.

  On the other hand, in a configuration in which all of the first intake pipe is included in one plane that intersects both the front and side surfaces, for example, the diagonal surface in FIG. 4, when viewed from the front and from the side And is visually recognized as a curved shape. However, since it is a two-dimensional first intake pipe that is entirely contained in one diagonal surface, the apex of the curved shape in the front view is the same as the apex of the curved shape in the side view after all. It becomes one point.

  On the other hand, in the first intake pipe 22 described above, the first vertex P1 that is the vertex in the front view is disposed in the region of the axially outer side S1o, and the second vertex P2 that is the vertex in the side view is the diameter. It arrange | positions in the area | region of direction outer side S2o. On the three-dimensional coordinates, the coordinates of the first vertex P1 are P1 (P1a, P1r, P1z), the coordinates of the second vertex P2 are P2 (P2a, P2r, P2z), and It is a different part. Therefore, since the bending of the first intake pipe 22 can be expanded in three dimensions, the configuration included in the diagonal plane, that is, compared to the configuration in which the bending of the first intake pipe can be expanded only in two dimensions. The curvature of the intake pipe can be designed to be large, and separation of the intake air flow in the first intake pipe 22 is less likely to occur. As a result, a decrease in intake efficiency in the turbocharger 40 can be suppressed.

[Test example]
With reference to FIGS. 5 to 10, test examples and examples of the intake device 20 will be described. Below, it demonstrates in order of the structure of a test example, the pressure distribution in an Example and a test example, and the flow velocity distribution in an Example and a test example. In the test example, the shape of the first intake pipe connected to the air cleaner 21 and the compressor 41 is different from the above-described embodiment. Therefore, in the following, the first intake pipe will be described in detail, and description of other configurations will be omitted.

  As shown in FIG. 5, the entire first intake pipe 52 in the test example is three-dimensionally viewed from the front, that is, when viewed from the front of the sheet of FIG. Instead of a curved shape, it is formed in a circular tube that is bent in multiple stages consisting of a combination of a portion formed in a two-dimensionally curved shape and a portion formed in a straight line.

  As shown in FIG. 6, the portion formed linearly in the first intake pipe 52 is a bending point FP1 disposed in the radial direction Dr along the reference plane A from the vicinity of the first connection portion 52a. Extends towards. Further, the two-dimensionally curved portion of the first intake pipe 52 extends from the bending point FP1 to the second connection portion 52b via the third vertex P3 arranged on the intake system arrangement side SAi from the bending point FP1. Extend.

[Pressure distribution in the first intake pipe]
With reference to FIGS. 7 and 8, the pressure distribution of the intake air flowing through each of the first intake pipe 22 of the example and the first intake pipe 52 of the test example having the same configuration as the above-described embodiment will be described. .

  In the first intake pipe 22 of the embodiment and the first intake pipe 52 of the test example, each intake pipe 22 includes the entirety of each intake pipe 22 and 52 and has a cross section parallel to the reference plane A described above. , 52 was calculated by simulation. FIG. 7 shows the result of the first intake pipe 22 of the example, and FIG. 8 shows the result of the first intake pipe 52 of the test example.

  As shown in FIG. 7, in the first intake pipe 52 of the embodiment, the flow pressure along the inner surface of the curved shape extends from the first connection portion 22a to the second connection portion 22b in the first intake pipe 52. It was found that they were almost the same. On the other hand, as shown in FIG. 8, in the first intake pipe 52 of the test example, along the inner surface of the curved shape in the portion from the first connection portion 52a to the bending point FP1 in the first intake pipe 52. It was confirmed that the pressure was smaller than that of the first intake pipe 52 of the example.

  In the first intake pipe 22 of the embodiment, a portion extending from the first connection portion 22a to the first vertex P1 extends toward the axially outer side S1o and extends from the reference plane A toward the intake system arrangement side SAi. Yes. On the other hand, in the first intake pipe 52 of the comparative example, the portion extending from the first connection portion 52a to the bending point FP1 extends along the reference plane A although extending toward the axially outer side S1o. Therefore, the curvature of the first intake pipe 22 and the bent portion B of the embodiment is larger than that of the bent portion B of the first intake pipe 52 of the test example. Therefore, the pressure drop in the first intake pipe 22 is suppressed.

  Thus, according to the first intake pipe 22 of the embodiment, compared to the first intake pipe 52 of Test Example 1, the pressure of the intake air decreases with the change in the shape of the first intake pipe 22, that is, It was confirmed that the flow of the intake air was prevented from being separated from the inner peripheral surface of the first intake pipe 22.

[Flow velocity distribution in the first intake pipe]
With reference to FIG. 9 and FIG. 10, the flow velocity distribution in the first intake pipe 22 of the embodiment and the first intake pipe 52 of the test example will be described. 9 shows the distribution of the flow velocity along the section line 9-9 in FIG. 7, and FIG. 10 shows the distribution of the flow velocity along the section line 10-10 in FIG. It is shown.

  In each of the first intake pipe 22 of the example and the first intake pipe 52 of the test example, the flow velocity distribution in the intake pipes 22 and 52 immediately before the intake of the intake air in the compressor 41 was calculated by simulation. . FIG. 9 shows the result of the first intake pipe 22 of the example, and FIG. 10 shows the result of the first intake pipe 52 of the test example.

  As shown in FIG. 9, in the first intake pipe 22 of the example, it was recognized that the region where the flow velocity of intake air is close to 0 is not formed over the entire first intake pipe 22. On the other hand, as shown in FIG. 10, in the first intake pipe 52 of the test example, it was recognized that a region where the flow velocity of intake air is close to 0 is formed on the inner surface in the curved shape. Thus, according to the first intake pipe 22 of the embodiment, compared to the first intake pipe 52 of the test example, a region where the flow velocity is close to 0 is less likely to be formed in the first intake pipe 22, that is, It was recognized that the flow of the intake air is difficult to separate from the inner peripheral surface of the first intake pipe 22.

As described above, according to one embodiment of the intake device, the effects listed below can be obtained.
(1) The shape of the first intake pipe 22 is a portion that is curved in both the front view and the side view, and the first vertex P1 in the front view and the second vertex P2 in the side view are different from each other. Therefore, it is possible to set the curvature in the first intake pipe 22 larger than that of the intake pipe that is curved in one plane, that is, the intake pipe that extends two-dimensionally or a combination of such intake pipes. Separation hardly occurs in the flow of the intake air in the first intake pipe 22. Therefore, a reduction in intake efficiency in the turbocharger 40 can be suppressed.

  (2) The first intake pipe 22 extends from the rotation center of the impeller 41b toward the axially outer side S1o that is the first vertex region, and passes through the radial outer side S2o that is the second vertex region from the rotation center of the impeller 41b. The first intake pipe 22 is bent to the turbine 42 side with respect to the compressor housing 41a. Therefore, a radius of curvature of more than half of the radius of rotation of the impeller 41b is ensured in the first intake pipe 22 on the axially outer side S1o.

  (3) Each of the axially outer side S1o and the radially outer side S2o is a region that is rotationally symmetric with respect to the rotation center of the impeller 41b. Two vertices P2 are arranged separately. As a result, since the position where the first intake pipe 22 is arranged is selected from the entire range along the direction in which the impeller 41b rotates, the degree of freedom of arrangement of the first intake pipe 22 can be increased. As a result, the degree of freedom of arrangement of other members constituting the intake device 20, components of the engine 10, members constituting the auxiliary machine of the engine 10, and the like can be increased.

  (4) Since the portion from the first connection portion 22a to the second vertex P2 is formed in a semicircular arc shape, and the portion from the first connection portion 22a to the second connection portion 22b is formed in a subarc shape, It is possible to suppress the curvature radius of the first intake pipe 22 from rapidly decreasing in the vicinity of the first connection portion 22a. As a result, it is possible to suppress the separation of the intake air flow in the vicinity of the intake air inlet with respect to the compressor 41.

  (5) Since the first vertex P1 and the second vertex P2 are arranged on the intake system arrangement side SAi with respect to the reference plane A, the path of the intake system is put together on the opposite side of the exhaust plane with respect to the reference plane A. Be placed. Since various sensors for measuring the intake air temperature and the intake pressure are attached to the intake system, it becomes easy to collectively arrange the sensors required for the intake system.

  (5) Since the inner diameter from the first connection portion 22a to the second vertex P2 is the same, the intake air is taken from the first connection portion 22a to the second vertex P2, that is, at the portion protruding at the first vertex P1. It is possible to suppress the separation of the flow. Therefore, it is possible to suppress the separation of the intake air flow immediately before the intake air inlet in the compressor 41.

In addition, the said embodiment can be changed and implemented suitably as follows.
-In the 1st intake pipe 22, the part from the 1st connection part 22a to the 2nd vertex P2 does not need to have the same internal diameter. Even in such a configuration, as long as the first apex P1 and the second apex P2 are different from each other in the first intake pipe 22, the effect according to the above (1) can be obtained.

  In the first intake pipe 22, the exhaust inlet portion 42 d and the intake outlet portion 41 c do not have to be arranged with the reference plane A interposed therebetween in the side view. The exhaust inlet portion 42 d and the intake outlet portion 41 c It may be arranged on the same side with respect to the reference plane A.

  -Both the first vertex P1 and the second vertex P2 may not be arranged on the intake system arrangement side SAi with respect to the reference plane A, and one of the first vertex P1 and the second vertex P2 is arranged on the intake system arrangement side SAi. The other may be arranged on the exhaust system arrangement side SAe. Alternatively, the first vertex P1 and the second vertex P2 may be arranged on the exhaust system arrangement side SAe.

  In the first intake pipe 22, the portion from the first connection portion 22 a to the second vertex P <b> 2 does not have to be formed in a semicircular arc shape protruding from the first vertex P <b> 1 in front view. In short, the first intake pipe 22 only needs to have a curved shape protruding from the first vertex P1 in a front view, and the portion from the first connection portion 22a to the second vertex P2 in the first intake pipe 22 is For example, it may be formed in an inferior arc shape or a superior arc shape.

  -In the 1st intake pipe 22, the part from the 1st connection part 22a to the 2nd connection part 22b does not need to be formed in an inferior arc shape by side view. In short, the first intake pipe 22 only needs to have a curved shape projecting at the second vertex P2 in a side view, and a portion of the first intake pipe 22 from the first connection portion 22a to the second connection portion 22b. May be formed, for example, in a semicircular arc shape or a dominant arc shape.

  -The 1st vertex P1 does not need to be arrange | positioned at the axial direction outer side S1o which is a 1st vertex area | region, and may be arrange | positioned at axial direction inner side S1i. Even in such a configuration, if the first intake pipe 22 has a curved shape protruding at the first vertex P1 in a front view, the effect according to the above (1) can be obtained.

-The 2nd vertex P2 does not need to be arrange | positioned at radial direction outer side S2o which is a 2nd vertex area | region, and may be arrange | positioned at radial direction inner side S2i. Even if it is such a structure, if the 1st intake pipe 22 is the curved shape which protrudes in the 2nd vertex P2 by side view, the effect according to said (1) can be acquired.
The first vertex P1 is the vertex on the compressor 41 side and the second vertex P2 is the vertex on the air cleaner 21 side, but the first vertex is the vertex on the air cleaner 21 side, and the second vertex is the vertex on the compressor side It may be. Even in such a configuration, the entire first intake pipe has a curved shape projecting at the first apex in front view, a shape projecting at the second apex in side view, and the first apex and the first If the two vertices are different from each other, the effect according to the above (1) can be obtained.

  The first intake pipe 22 may be a hose formed of resin or the like instead of a pipe formed of metal.

  DESCRIPTION OF SYMBOLS 10 ... Engine, 11 ... Cylinder block, 12 ... Cylinder, 20 ... Intake device, 21 ... Air cleaner, 22, 52 ... 1st intake pipe, 22a, 52a ... 1st connection part, 22b, 52b ... 2nd connection part, 22P ... sensor port, 23 ... second intake pipe, 24 ... intake manifold, 25 ... intercooler, 30 ... exhaust device, 31 ... exhaust manifold, 32 ... first exhaust pipe, 33 ... second exhaust pipe, 40 ... turbocharger, DESCRIPTION OF SYMBOLS 41 ... Compressor, 41a ... Compressor housing, 41b, 42b ... Impeller, 41c ... Intake outlet part, 42 ... Turbine, 42a ... Turbine housing, 42c ... Exhaust outlet part, 42d ... Exhaust inlet part, 43 ... Rotating shaft, CA ... Compression Air, EA ... exhaust, IA ... intake, FP1 ... flexion point, P1 ... first vertex, P2 ... second vertex, P3 ... third vertex , SAe ... exhaust system disposition side, SAi ... intake system disposed side, S1i ... axially inward, S1o ... axially outward, S2i ... radially inward, S2o ... radially outward.

Claims (4)

An air cleaner,
A turbocharger with a compressor;
An intake pipe formed in a circular tube connecting the air cleaner and the compressor;
With
The intake pipe is
The whole is formed in a curved shape protruding at the first vertex in front view, and
In the side view, the whole is formed into a curved shape protruding at the second vertex,
Wherein the first apex and the second apex Ri different sites der each other,
The turbocharger comprises a turbine coupled to the compressor;
The compressor includes a housing that houses an impeller that rotates about a rotation axis.
The side opposite to the turbine with respect to the housing is set as a first vertex region,
A radially outer side of the rotating shaft with respect to the housing is set as a second vertex region,
The intake pipe includes a connection portion facing the rotation center of the impeller in the housing, extends from the connection portion toward the first vertex region, and passes through the second vertex region from the connection portion. Curved to the turbine side relative to the housing;
The first vertex is disposed on the opposite side of the turbine from the turbine and on the radially inner side of the rotary shaft with respect to the housing;
The second apex is disposed on the opposite side of the turbine from the turbine and on the radially outer side of the rotating shaft with respect to the housing;
The air intake device , wherein the first vertex is disposed closer to the connecting portion than the second vertex . The connecting portion is set as the first connecting portion;
The intake pipe includes a second connection portion connected to the air cleaner,
The intake pipe is
In a front view, a portion from the first connection portion to the second vertex is formed in a semicircular arc shape projecting at the first vertex, and
The intake device according to claim 1 , wherein a portion from the first connection portion to the second connection portion is formed in an inferior arc shape in a side view. A vertical plane including the rotation axis is set as a reference plane,
The turbine includes an exhaust inlet portion into which exhaust is introduced,
The compressor includes an intake outlet portion from which intake air is derived,
In side view,
The exhaust inlet portion and the intake outlet portion are disposed across the reference plane,
The intake device according to claim 1 or 2, wherein the first vertex and the second vertex are arranged on an intake outlet side with respect to the reference plane. In the previous Symbol intake pipe,
Portion from the previous Kise' connection portion to said second vertex, an intake device according to any one of claims 1 to 3 having the same inner diameter.