JP3959590B2 - Engine intake passage structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine intake passage structure in which a pipe member (mount member) for supporting a power unit is divided into a portion that supports the power unit and a portion that is used for the intake passage, and a joint between both divided portions is firmly coupled. It is about.
[0002]
[Prior art]
Conventionally, a turbo vehicle in which a power unit is arranged under the floor in the center of the vehicle body has a layout in which the power unit 21, that is, the engine 22 and the transmission 23 are lowered to the limit of the height of the ground 24 as shown in FIG. ing. However, when mounting the mount member 25 that supports the engine 22 or the like in order to improve vibration and sound insulation performance, the mount member 25 is placed on the front side of the engine 22 so as to surround the engine 22 in relation to the height of the ground 24. Or, it is arranged on the rear side. In FIG. 12, symbol U indicates the upper side of the vehicle body, symbol R indicates the rear of the vehicle body, and symbol F indicates the front of the vehicle body.
[0003]
In particular, in the case of a 4WD vehicle (four-wheel drive vehicle), the transfer case (not shown) is large, so that the mount member 25 cannot be passed through the rear side of the engine 22, as shown in FIGS. 13 and 14. , So that it passes through the front side.
[0004]
In addition, the turbo car requires an intercooler 27 connected to the supercharger (exhaust turbine type) 26 to be disposed in front of the vehicle where the wind hits in terms of performance, so one of the intercooler pipes 28 connected to the intercooler 27 is The intercooler pipe 28 was distributed from the front F of the vehicle to the exhaust supercharger 26, the other to the throttle body 29 of the intake system engine 22, and the left and right sides of the vehicle at the front of the vehicle.
[0005]
12 to 14, reference numeral 30 denotes a mount member. The mount member 30 includes a mount bracket 31 and a mount (shown only on the right side in FIG. 13) 32. 13 and 14, the reference numeral 33 indicates a front propeller shaft. In FIG. 14, reference numerals 34L and 34R indicate a left body frame and a right body frame, and reference numeral 35 indicates a cross member. The cross member 35 connects the left body frame 34L and the right body frame 34R.
[0006]
In the conventional technology described above, in the case of a turbo vehicle of 4WD, if the mount member 25 is disposed so as to surround the front side of the engine 22, the front propeller shaft 33 passes through the front side. The shape of 25 may be complicated.
[0007]
Further, since the intercooler pipe 28 is also arranged separately from the front F of the vehicle on the left and right sides of the vehicle so as not to interfere with the front propeller shaft 33, the shape of the intercooler pipe 28 may be complicated as described above. There is.
[0008]
Furthermore, the intercooler pipe 28 and the mount member 25 are arranged close to each other in the layout, and it is difficult to ensure mutual clearance. In this case, if the mount member 25 is preferentially disposed, the intercooler pipe 28 must be largely rotated to the outside of the vehicle body frames 34L and 34R. For this reason, there is a problem that the intercooler pipe 28 becomes longer, the weight increases, and the cost increases. Further, when the intercooler pipe 28 becomes long, there is a problem that pressure loss or the like is likely to occur and the performance is deteriorated.
[0009]
Accordingly, the present applicant has devised a pipe member (mount member 36) that supports the engine body as a part of the intake passage, thereby eliminating the conventional intercooler pipe 28. Have already been filed (see Japanese Patent Application No. 2000-131221).
[0010]
The thing of the said application is demonstrated based on FIG. The same parts as those in FIGS. 12 to 14 are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in the figure, a substantially U-shaped, pipe-like mount member 36 that supports the power unit 21 is disposed on the front and left and right sides of the power unit 21 that constitutes the engine 22 and the like. The hollow part of the member 36 is used for the intake passage.
[0011]
More specifically, a supercharger side branch pipe 37 connected to the supercharger 26 is connected to the vicinity of the rear end of the mount member 36L on one side constituting the mount member 36. In connection with the supercharger side branch pipe 37, the supercharger side branch pipe 37 is coupled vertically (see arrow P in FIG. 7) to the straight portion (see arrow D in FIG. 7) of the mount member 36L on one side. I am letting. The mount member 36L and the supercharger side branch pipe 37 may be connected vertically or may be connected obliquely (not shown). 6 and 7 are vertically connected.
[0012]
A throttle body side branch pipe 38 connected to the throttle body 29 is connected to the other mount member 36R. In connecting the throttle body side branch pipe 38, the throttle body side branch pipe 38 is coupled obliquely (see arrow S in FIG. 8) to the straight portion (see arrow D in FIG. 8) of the mount member 36R on the other side. Yes.
[0013]
The tips of the mount members 36L and 36R on one side and the other side are connected to the intercooler 27. Further, as shown in FIG. 6, a lid 39 is fitted into the side (rear end) of the one side mounting member 36L and the other side mounting member 36R where the mounting member 30 is provided, so that the hollow part is formed. It is kept airtight. Reference numeral 40 denotes a vehicle body mounting bracket welded to the mount member 36L on one side and the mount member 36R on the other side. The mount members 36L and 36R are suspended from a vehicle body (not shown) via the vehicle body mounting bracket 40.
[0014]
By configuring in this way, the intake air is compressed by the supercharger 26, and this compressed intake air is sent to the intercooler 27 from the supercharger side branch pipe 37 and the mount member 36L on one side, The temperature of the intake air whose temperature has increased due to the compression is lowered, and this intake air is supplied to the throttle body 29 via the other side mount member 36R and the throttle body side branch pipe 38 and burned.
[0015]
[Problems to be solved by the invention]
However, in the above prior art, the turbocharger side branch pipe 37 is connected to the mount member 36L on one side, and the throttle body side branch pipe 38 is connected to the mount member 36R on the other side. As shown at 10, when the air was branched, the air was split into two forks, resulting in a flow loss L. In addition, since it is necessary to cover the end 39 of the mounting member 36L on one side and the end of the mounting member 36R on the other side so that the intake air does not flow outside, the number of parts increases and the work is complicated. There is a problem to become.
[0016]
Furthermore, as shown in FIG. 11, since the notch 41 is made in the straight portion of the mount member 36L on one side and the straight portion of the mount member 36R on the other side, and the branch pipes 37 and 38 are respectively attached, the rigidity is lowered. Therefore, it is necessary to add a plate-like reinforcing member 42, and this also increases the number of parts, resulting in a problem that the work is complicated.
[0017]
The present invention has been made in view of this point. An engine support pipe member (mount member) used in a part of an intake passage is composed of a pipe member that supports a power unit and a pipe member that is used as an intake passage. It is an object of the present invention to provide an engine intake passage structure with improved workability by improving the joint between both pipe members to avoid loss of air flow and reducing the number of parts.
[0018]
[Means for Solving the Problems]
The present invention provides, as means for solving the above problems, to place the power unit consisting of engine and transmission under the floor of the vehicle, said by the upper surface substantially U-shaped pipe member connecting the front side and both sides of the power unit In an intake passage structure of an engine that supports a power unit and has an intake passage that communicates with an intercooler disposed in front of the power unit inside the pipe member.
The pipe member supports a side surface of the power unit in a vehicle width direction via a mount member, and extends to the front-rear direction along the side surface of the power unit. A second pipe member extending from the front surface along the side surface of the power unit , wherein the first pipe member is formed to have a larger diameter than the second pipe member, and the front end of the first pipe member A notched portion having a substantially radius portion cut in the axial direction is provided at the portion, a curved portion is provided at a rear end portion of the second pipe member, and the second pipe member is communicated with the intercooler via the curved portion. A convex side of the curved portion so that the cutout portion of the first pipe member covers the curved portion of the second pipe member. In which the said second pipe member and the first pipe member is connected by mating crowded al difference, characterized in that the formation of the intake passage that communicates with said intercooler inside of the second pipe member is there.
[0019]
According to the first aspect of the present invention, the pipe member as the mount member used for supporting the power unit is used as a part of the intake passage, and a part of the dedicated intake passage is reduced. In addition, a pipe member that supports the power unit and a pipe member that uses the inside as an intake passage are formed separately to enable selection of the pipe diameter, material, and the like according to the application.
Further, the intake passage is formed only by the second pipe member, so that the connection portion between the first pipe member and the second pipe member does not become the resistance of the intake passage. Further, the first pipe member that supports the power unit and the second pipe member that uses the inside as an intake passage are formed separately, and the first pipe member is attached to the curved portion of the second pipe member so as to cover the curved portion. By connecting and fitting them together, they are connected to form a connection portion that does not depend on cutting. This increases the rigidity of the connecting portion and eliminates the leakage prevention lid that has been necessary in the past.
Moreover, the diameter of the first pipe member is formed larger than the diameter of the second pipe member, and the first pipe member is connected so as to cover the second pipe member. This connection increases the rigidity of the connecting portion.
[0020]
The invention described in claim 2 is the mount bracket of the mount member attached to the first pipe member, wherein the connection portion between the first pipe member and the second pipe member is the one described in claim 1. And a portion sandwiched between the vehicle body mounting bracket attached to the second pipe member .
[0021]
According to the invention described in claim 2, in order to prevent the reinforcing member from being attached to the connecting portion between the two pipe members, the connecting portion between the two pipe members is positioned at a portion sandwiched between the mounting bracket and the vehicle body mounting bracket. .
[0022]
DETAILED DESCRIPTION OF THE INVENTION
In the following, an embodiment of the present invention will be described with reference to FIG. 1 schematically showing the main part, with the same reference numerals given to the same parts as in FIGS. FIG. 1 schematically shows a main part of a turbo vehicle in which a power unit 21 including an engine 22 and a transmission 23 (see FIGS. 12 and 14) is disposed under the floor at the center of the vehicle body.
[0023]
On the front surface and both side surfaces of the power unit 21, a mount member 1 having a substantially U shape as viewed from above is disposed so as to surround the power unit 21 with a metal pipe member. The mount member 1 supports the engine body via mount members 30 disposed on both side surfaces of the engine 22.
[0024]
The mount member 1 includes a first pipe member that supports both side surfaces of the power unit 21, that is, a first mount member 2 and a second pipe member that uses the inside as an intake passage, that is, a second mount member 3 ( (See FIG. 2).
[0025]
The second mount member 3 is divided at an appropriate position on the front portion of the engine 22, and the divided second mount member 3 </ b> L extends rearwardly along the left side surface of the engine 22 from the front surface of the engine 22 and has a rear end. The side is a supercharger side piping section 4 that is curved and extends outward. An exhaust turbine supercharger 26 is connected to the supercharger side piping section 4.
[0026]
The second mount member 3R on the other divided side of the second mount member 3 extends rearward along the right side surface of the engine 22 from the right front surface of the engine 22, and the rear end side is curved and extends inward. The throttle body side piping section 5 is provided. A throttle body 29 is connected to the throttle body side piping section 5.
[0027]
As a result, the exhaust turbine supercharger 26, the supercharger side piping portion 4, the second mounting member 3L on one side, the intercooler 27, the second mounting member 3R on the other side, the throttle body side piping portion 5, the intake manifold. (Not shown), an intake passage of the throttle body 29 is formed. If connected in this way, the hollow portion of the second mount member 3L on the one side and the second mount member 3R on the other side can be used as a part of the intake passage.
[0028]
The first mount member 2L on one side is connected to the second mount member 3L on one side constituting a part of the intake passage, and the first mount member on the other side is connected to the second mount member 3R on the other side. 2R is connected. Since the structures of these connecting portions 6 are substantially the same on one side and the other side, the description will be made by taking the connecting portion 6 of the second mount member 3L on one side and the first mount member 2L on one side as an example.
[0029]
As shown in FIGS. 3 and 4, the connecting portion 6 is cut in the axial direction from the appropriate position of the outer peripheral portion to the substantially radial portion of the distal end surface, in the vicinity of the distal end portion of the first mount member 2L on one side. A cutout portion 7 is provided, and the cutout portion 7 of the first mount member 2L is covered with the convex side of the curved portion 8 of the supercharger side piping portion 4 of the second mount member 3L from the rear of the vehicle. They are fitted and connected by welding. The arrows shown in FIGS. 3 and 4 indicate the insertion direction of the first mount member 2L.
[0030]
By this insertion, the connection portion 6 as described above is formed on the second mount member 3L and the first mount member 2L on one side (see FIG. 5). As shown in FIG. 1, the connecting portion 6 is located at a portion sandwiched between the mounting bracket 31 </ b> L on one side and the vehicle body mounting bracket 40. There is no need for reinforcement.
[0031]
Thus, since the first mount member 2L on one side is fitted and connected so as to cover the supercharger side piping part 4 of the second mount member 3L on the one side, the diameter of the first mount member 2 Is formed larger than the diameter of the second mount member 3. The vehicle body mounting bracket 40 is welded to the second mount member 3 and suspends the second mount member 3 from the vehicle body.
[0032]
As shown in FIG. 2, the front side of the second mount member 3 </ b> L on the one side and the second mount member 3 </ b> R on the other side of the second mount member 3 are bent at the front portion of the engine 22. It extends straight and parallel to the front of the vehicle. These two front parts are integrally welded by a connecting plate 9 as shown in FIG. An intercooler 27 for cooling the supercharged intake air is connected to the front end portions of the second mount member 3L on one side and the second mount member 3R on the other side. Further, the front side of the engine 22 of the second mount member 3L on one side is shown in FIG. 2 (also see FIG. 14) in order to avoid interference with the front propeller shaft 33 for four-wheel drive (4WD). Further, the shape is raised upward.
[0033]
Further, as shown in FIG. 1, a left mount member 30 </ b> L that connects the first mount member 2 </ b> L on one side and the left side surface portion of the engine 22 is attached to the first mount member 2 </ b> L on one side. Further, a right mount member 30R that connects the other first mount member 2R and the right side surface of the engine 22 is attached to the other first mount member 2R.
[0034]
The left mount member 30L is composed of a mount bracket 31L and a mount (not shown), and the right mount member 30R is composed of a mount bracket 31R and a mount 32R (the right mount member 30R in FIG. 1 is mounted with the mount bracket 31R. 32R is integrated). The first mount member 2L on one side, the first mount member 2R on the other side, and the engine 22 are connected by known mount members 30L and 30R.
[0035]
Next, the operation of the embodiment will be described. A mount member 1 made of a pipe member, which is disposed so as to surround the engine 22, is formed by a first mount member 2 and a second mount member 3 on the front surface and both side surfaces of the engine 22. The supercharger side piping part 4 is provided on the rear end side of the second mount member 3L on one side, and the supercharger 26 is connected to the supercharger side piping part 4 and at the tip of the second mount member 3L. Intercooler 27 is connected. Then, a throttle body side piping part 5 is provided on the rear end side of the second mount member 3R on the other side, the front end part of which is connected to the intercooler 27, and a throttle body 29 is connected to the throttle body side piping part 5 for intake. Form a passage. As a result, the conventional intercooler pipe 28 (see FIGS. 13 and 14) can be eliminated.
[0036]
Since a part of the mount member 1 is formed in the intake passage in this manner, the intake air is compressed by the supercharger 26, and this compressed air is intercooled through the supercharger side piping section 4 and the second mount member 3L on one side. The temperature of the intake air that has risen due to the compression is lowered. Further, the intake air whose temperature has been lowered is supplied to the throttle body 29 via the second mount member 3R on the other side and the throttle body side piping section 5 and burned. If the second mount member 3 of the mount member 1 is used as a part of the intake passage in this way, a sufficient intake passage can be secured even if the conventional intercooler pipe 28 is eliminated.
[0037]
Further, by forming the mount member 1 with the first mount member 2 that supports the power unit 21 and the second mount member 3 with the inside as the intake passage, there is no bifurcated portion in the intake passage, It becomes possible to eliminate the flow loss of the intake air. Further, when the entire mount member 1 is used as an intake passage, it is necessary to attach a lid 39 for preventing air leakage. However, a part of the mount member 1 is used as a dedicated intake passage (second mount member 3). Therefore, the lid is unnecessary, and the number of parts and the number of manufacturing steps can be reduced. Further, since the dedicated intake passage is formed as an integral structure, it is not necessary to have a notch for connecting a branch pipe as in the prior art, and the rigidity can be increased.
[0038]
【The invention's effect】
Since the present invention is an engine intake passage structure configured as described above, according to the first aspect of the present invention, a pipe member as a mount member used to support a power unit is provided. Since it can also be used as a part of the intake passage, a part of the intake passage provided exclusively can be reduced.
[0039]
As a result, the number of parts and the number of assembling steps can be reduced, and the workability can be improved without the complexity of assembling. Furthermore, it can contribute to weight reduction and space saving. In addition, since the pipe member that supports the power unit and the pipe member that uses the inside as an intake passage are formed separately, the pipe diameter, material, and the like according to the application can be appropriately selected.
[0040]
Further, since only the second pipe member is used as the intake passage, the connection portion between the first pipe member and the second pipe member does not become the resistance of the intake passage. As a result, the output performance of the engine can be improved.
The first pipe member that supports the power unit and the second pipe member that uses the inside as an intake passage are formed separately, and both pipe members are connected by inserting the first pipe member into the curved portion of the second pipe member. Therefore, the connection part which does not depend on a notch can be formed. This can increase the rigidity of the connecting portion.
[0041]
That is, when connecting the first pipe member and the second pipe member, it is not necessary to make a cut in the side surface of any one of the pipe members, so that it is possible to prevent a reduction in the rigidity of the pipe due to the cut. As a result, the number of manufacturing steps can be reduced. Furthermore, since it is not necessary to provide a reinforcing plate at the connecting portion, the number of parts can be reduced. In addition, since it is no longer necessary to provide a lid attached to the rear end portion of a pipe member that has conventionally been formed of a single member, the number of parts and the number of manufacturing steps can be reduced.
[0042]
Further, since the diameter of the first pipe member is larger than the diameter of the second pipe member, the first pipe member can be connected so as to cover the second pipe member. Thereby, the rigidity of a connection part can be improved. If the rigidity of the connection portion can be increased in this way, attachment of the reinforcing plate can be avoided, and the number of parts can be reduced.
[0043]
According to the second aspect of the present invention, the connecting portion between the first pipe member and the second pipe member is located at a portion sandwiched between the mount bracket and the vehicle body mounting bracket that couples the mount member to the vehicle body. The load applied to the connecting portion is small, and the reinforcing member attached to the connecting portion can be eliminated.
[Brief description of the drawings]
FIG. 1 is a top view schematically showing a main part of an embodiment of the present invention.
FIG. 2 is a top view of the second pipe member shown in FIG.
FIG. 3 is a top view showing a state where the second pipe member shown in FIG. 1 is joined so as to cover the first pipe member.
4 is an enlarged perspective view showing a joint portion between two pipe members shown in FIG. 3. FIG.
FIG. 5 is a top view showing a place where the second pipe member and the first pipe member shown in FIG. 4 are joined together.
FIG. 6 is a top view of a conventional mount member partially used for an intake passage.
7 is a perspective view showing a connection between a mount member on one side and a supercharger side branch pipe shown in FIG. 6; FIG.
8 is a perspective view showing the connection between the other side mount member and the throttle body side branch pipe shown in FIG. 6; FIG.
9 is a schematic diagram showing the air flow in the connecting portion shown in FIG. 7;
10 is a schematic diagram showing the air flow in the connection section shown in FIG. 8. FIG.
11 is a perspective view showing a state where a reinforcing member is attached to the connecting portion shown in FIG. 8. FIG.
FIG. 12 is a schematic side view for explaining a vehicle mount member in which an engine is disposed under the floor at the center of the vehicle body.
FIG. 13 is a top view showing an arrangement state of a conventional mount member and an intercooler pipe.
14 is a perspective view of what is shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mount member 2 1st mount member 3 2nd mount member 7 Bending part 8 Connection part 21 Power unit 31 Mount bracket 40 Car body mounting bracket

Claims (2)

Place the power unit consisting of engine and transmission under the floor of the vehicle, the upper surface substantially U-shaped pipe member connecting the front side and both sides of the power unit and supporting said power unit, said power unit inside the pipe member In the intake passage structure of the engine provided with an intake passage that communicates with the intercooler disposed in front,
The pipe member supports a side surface of the power unit in a vehicle width direction via a mount member, and extends to the front-rear direction along the side surface of the power unit. A second pipe member extending from the front surface along the side surface of the power unit , wherein the first pipe member is formed to have a larger diameter than the second pipe member, and the front end of the first pipe member A notched portion having a substantially radius portion cut in the axial direction is provided at the portion, a curved portion is provided at a rear end portion of the second pipe member, and the second pipe member is communicated with the intercooler via the curved portion. A convex side of the curved portion so that the cutout portion of the first pipe member covers the curved portion of the second pipe member. And said second pipe member and the first pipe member is connected by mating crowded et difference, the engine, characterized in that the formation of the intake passage that communicates with said intercooler inside of the second pipe member Intake passage structure. Connecting portions between the second pipe member and the first pipe member is located at a site sandwiched and mounting bracket of the mount member attached to the first pipe member and to the vehicle body mounting bracket attached to the second pipe member The engine intake passage structure according to claim 1 , wherein the intake passage structure is an engine.

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