JP7315057B1 - Exhaust structure - Google Patents

Abstract

An exhaust structure in which an exhaust brake device is easily inserted with a plurality of gaskets interposed between a turbocharger and an exhaust pipe. An exhaust structure (1) includes an exhaust manifold (11), a turbocharger (12), an exhaust pipe (15) through which exhaust gas passes, and a first gasket and a second gasket interposed between the turbocharger (12) and the exhaust pipe (15). and an exhaust brake device 13 arranged in a state where the turbocharger 12, the first gasket, the exhaust brake device 13, the second gasket, and the exhaust pipe 15 are connected so as to line up along a predetermined reference line. In the exhaust structure 1, the position of the turbocharger 12 with respect to the exhaust manifold 11 is variably provided in the exhaust manifold 11 in the thickness direction of the first gasket and the second gasket. [Selection drawing] Fig. 1

Description

The present invention relates to an exhaust structure provided in a vehicle.

Vehicles are conventionally provided with an exhaust structure. Patent Document 1 discloses a structure in which an exhaust passage connected to an exhaust manifold is provided with a turbocharger, an exhaust brake device, and an exhaust gas purification device.

As an exhaust structure, there is also known a structure in which a turbocharger, an exhaust brake device (exhaust brake device), and an exhaust pipe are connected, and the exhaust brake device is arranged between the turbocharger and the exhaust pipe with a gasket interposed therebetween.

Japanese Patent No. 5470808

In a conventional exhaust structure, multiple gaskets are replaced with new gaskets when the exhaust brake system is replaced. Therefore, depending on the thickness of the gasket, it was sometimes difficult to insert the exhaust brake system with multiple gaskets interposed between the turbocharger and the exhaust pipe.

Therefore, the present invention has been made in view of these points, and it is an object of the present invention to provide an exhaust structure in which an exhaust brake device can be easily inserted with a plurality of gaskets interposed between a turbocharger and an exhaust pipe.

In a first aspect of the present invention, an exhaust manifold through which exhaust gas generated in an engine of a vehicle passes; a turbocharger through which the exhaust gas flowing out from the exhaust manifold passes to increase the density of air flowing into the engine; an exhaust pipe through which the exhaust gas passes; an exhaust brake device, wherein the turbocharger, the first gasket, the exhaust brake device, the second gasket, and the exhaust pipe are connected so as to line up along a predetermined reference line, wherein the position of the turbocharger relative to the exhaust manifold is variable in the thickness direction of the first gasket and the second gasket, which is a direction parallel to the reference line.

Further, at least one of the turbocharger and the exhaust manifold may be formed with an elongated hole whose longitudinal direction is positioned in the thickness direction of the first gasket and the second gasket, and the turbocharger and the exhaust manifold may be coupled by fastening means passed through the elongated hole.

A bracket may be further provided for positioning the turbocharger with respect to the exhaust manifold, and the bracket may position the turbocharger at a predetermined fixed position where the turbocharger approaches the exhaust pipe.

Further, the bracket may have a receiving surface extending in a direction perpendicular to the thickness direction of the first gasket and the second gasket, the receiving surface contacting a part of the exhaust pipe or a part of a member coupled to the exhaust pipe.

Advantageous Effects of Invention According to the present invention, in an exhaust structure, it is possible to easily insert an exhaust brake device with a plurality of gaskets interposed between a turbocharger and an exhaust pipe.

2 shows the configuration of an exhaust structure according to the present embodiment. The state where the exhaust brake device, the first gasket, and the second gasket are removed from the exhaust structure is shown. The exhaust brake device, the first gasket, and the second gasket are removed from the exhaust structure, and the turbocharger is positioned on the rear side when the turbocharger is variable in the longitudinal direction of the vehicle. 1 shows a structure in which an exhaust brake device is installed with a first gasket and a second gasket interposed between a turbocharger and an exhaust pipe, and a procedure for installation. The structure near the fastening means in a state where the turbocharger and the exhaust manifold are coupled is shown. It shows the shape of the slot. The structure of the exhaust structure viewed from the lateral side in the vehicle width direction is shown. The engine and exhaust structure are shown mounted on the vehicle.

[Configuration of Exhaust Structure 1]
FIG. 1 is a diagram showing the configuration of an exhaust structure 1 according to this embodiment. FIG. 2 is a diagram showing a state in which the exhaust brake device 13, the first gasket 141, and the second gasket 142 are removed from the exhaust structure 1. FIG. Note that the turbocharger 12 in FIG. 2 has a structure that can be variably positioned in the longitudinal direction of the vehicle, and is positioned on the front side here. FIG. 3 shows a state in which the exhaust brake device 13, the first gasket 141, and the second gasket 142 are removed from the exhaust structure 1, and the turbocharger 12 is positioned on the rear side when the turbocharger 12 is variable in the longitudinal direction of the vehicle.

The exhaust structure 1 has an exhaust manifold 11 , a turbocharger 12 , an exhaust brake device 13 , a first gasket 141 , a second gasket 142 , an exhaust pipe 15 , an exhaust gas purification device 16 and a plurality of fastening means 17 .

The exhaust manifold 11 is a component through which the exhaust gas generated by the engine 2 of the vehicle passes. The engine 2 is, for example, a gasoline engine or a diesel engine. Although illustration is omitted, the engine 2 has a cylinder head and a cylinder block. A cylinder block is provided below the cylinder head. The exhaust manifold 11 is connected to the cylinder head of the engine 2. Exhaust gas generated by the engine 2 flows into the exhaust manifold 11 . Details of the exhaust manifold 11 will be described later.

The turbocharger 12 is a device that increases the density of the air flowing into the engine 2 by passing the exhaust gas flowing out from the exhaust manifold 11 . Turbocharger 12 has turbine 121 , shaft 122 and compressor 123 . Turbine 121 is rotated by the flow of exhaust gas. Shaft 122 transmits the rotational force of turbine 121 to compressor 123 . Compressor 123 compresses air with the rotational force of turbine 121 transmitted by shaft 122 .

The air compressed by the compressor 123 flows through the intake passage 31 and flows into the intake manifold 32 via an intercooler and the like (not shown). The intake manifold 32 is connected to the cylinder head of the engine 2. Air flowing out from the intake manifold 32 flows into the engine 2 . Details of the turbocharger 12 will be described later.

The exhaust brake device 13 is arranged between the turbocharger 12 and the exhaust pipe 15 with a first gasket 141 and a second gasket 142 interposed therebetween. The exhaust brake device 13 can brake the vehicle by allowing the exhaust gas flowing out from the turbocharger 12 to pass through or block it.

A driver can change the exhaust brake device 13 to an operating state or a non-operating state by operating an operation unit (not shown). When the driver of the vehicle activates the exhaust brake device 13 by operating the operation unit, a movable valve in the exhaust pipe of the exhaust brake device 13 closes to stop the flow of exhaust gas. As a result, the exhaust pressure in the engine 2 increases, the rotation speed of the engine 2 is suppressed by the pumping loss, and the braking force can be increased.

The first gasket 141 is a sealing component for hermetic sealing. A first gasket 141 is provided between the turbocharger 12 and the exhaust brake device 13 .

The second gasket 142, like the first gasket 141, is a sealing component for hermetic sealing. A second gasket 142 is provided between the exhaust brake device 13 and the exhaust pipe 15 .

The first gasket 141 and the second gasket 142 are compressed and attached between the turbocharger 12 and the exhaust braking device 13 and between the exhaust braking device 13 and the exhaust pipe 15, respectively, in a state of elastic or plastic deformation.

The first gasket 141 and the second gasket 142 are replaced with new ones when the exhaust brake device 13 is replaced, for example.

The exhaust pipe 15 is a component through which exhaust gas passes. The exhaust pipe 15 connects the exhaust brake device 13 and the exhaust gas purification device 16 .

The exhaust gas purification device 16 is a device for cleaning exhaust gas. The exhaust gas purification device 16 includes, for example, a diesel particulate filter (DPD: Diesel Particulate Diffuser).

The fastening means 17 is a component for fixing the turbocharger 12 to the exhaust manifold 11 . Details of the fastening means 17 will be described later.

FIG. 4 is a diagram showing the structure of the exhaust brake device 13 mounted with the first gasket 141 and the second gasket 142 interposed between the turbocharger 12 and the exhaust pipe 15 and the mounting procedure. In the exhaust structure 1, as schematically shown in FIG. 4(c), the turbocharger 12, the first gasket 141, the exhaust brake device 13, the second gasket 142, and the exhaust pipe 15 are connected along a predetermined reference line. The predetermined reference line is a reference line extending in the longitudinal direction of the vehicle in this embodiment. The thickness directions of the first gasket 141 and the second gasket 142 are parallel to a predetermined reference line.

Exhaust gas generated by the engine 2 flows through the exhaust manifold 11, the turbocharger 12, the first gasket 141, the exhaust braking device 13, the second gasket 142, the exhaust pipe 15, and the exhaust gas purification device 16 in this order (see also FIG. 1).

In the exhaust structure 1 , the position of the turbocharger 12 with respect to the exhaust manifold 11 is variable in the thickness direction of the first gasket 141 and the second gasket 142 .

[Removal of exhaust brake device 13 and replacement of gasket]
By the way, when an operator removes the exhaust brake device 13 and reinstalls the exhaust brake device 13 for the purpose of parts replacement or inspection, the following problems may occur. Specifically, when attempting to install the exhaust brake device 13 with the new first gasket 141 and the second gasket 142 interposed therebetween, the new first gasket 141 and the second gasket 142 are thicker than the old ones, so there arises a problem that it is difficult to insert the first gasket 141, the exhaust brake device 13, and the second gasket 142 between the turbocharger 12 and the exhaust pipe 15.

Therefore, in the present embodiment, the turbocharger 12 is variably positioned in the thickness direction of the first gasket 141 and the second gasket 142 . Specifically, as shown in FIGS. 4(a) and 4(b), the turbocharger 12 is configured to be movable in the horizontal direction of the drawing. With such a configuration, the worker can install the exhaust brake device 13 with the turbocharger 12 positioned on the left side of the drawing, thereby improving workability. A specific configuration will be described below.

FIG. 4(a) is a diagram showing a state where the turbocharger 12 is positioned on the front side when it can move in the longitudinal direction of the vehicle. FIG. 4B is a diagram showing a state where the turbocharger 12 is positioned on the rear side when it can move in the longitudinal direction of the vehicle.

When installing the exhaust brake device 13 with the first gasket 141 and the second gasket 142 interposed between the turbocharger 12 and the exhaust pipe 15, the installation is performed as follows.

First, the first gasket 141 and the second gasket 142 before being arranged between the turbocharger 12 and the exhaust pipe 15 are arranged on both sides of the exhaust brake device 13 (Fig. 4(a)).

As shown in FIG. 4A, when the turbocharger 12 is positioned on the front side of the vehicle, the total length of the new first gasket 141, the second gasket 142, and the exhaust brake device 13 is, for example, longer than the length between the turbocharger 12 and the exhaust pipe 15. Therefore, there arises a problem that it is difficult to insert the first gasket 141 , the exhaust brake device 13 and the second gasket 142 between the turbocharger 12 and the exhaust pipe 15 .

Here, when the turbocharger 12 is positioned on the rear side of the vehicle (FIG. 4(b)), the space between the turbocharger 12 and the exhaust pipe 15 is widened. As an example, the length between the turbocharger 12 and the exhaust pipe 15 is longer than the entire length of the new first gasket 141 , second gasket 142 and exhaust brake device 13 .

Finally, the exhaust brake device 13 is arranged between the turbocharger 12 and the exhaust pipe 15 with the first gasket 141 and the second gasket 142 interposed therebetween (Fig. 4(c)). After that, the operator returns the turbocharger 12 to the position shown in FIG. 4(a) and fixes each part in place. Specifically, a plurality of fastening means such as bolts positioned on both sides of the exhaust brake device 13 in FIG. 1 are tightened.

Thus, the exhaust brake device 13 is attached between the turbocharger 12 and the exhaust pipe 15 with the first gasket 141 and the second gasket 142 interposed therebetween.

In the exhaust structure 1, as described above, the position of the turbocharger 12 with respect to the exhaust manifold 11 is variable in the thickness direction of the first gasket 141 and the second gasket 142, which is the direction parallel to the predetermined reference line.

As a result, in the exhaust structure 1 , the position of the turbocharger 12 with respect to the exhaust manifold 11 can be changed in the thickness direction of the first gasket 141 and the second gasket 142 . Therefore, in the exhaust structure 1, the length between the turbocharger 12 and the exhaust pipe 15 can be made longer than the lengths of the exhaust brake device 13 and the first gasket 141 and the second gasket 142 before being arranged between the turbocharger 12 and the exhaust pipe 15. Therefore, in the exhaust structure 1 , the exhaust brake device 13 can be easily inserted with the plurality of gaskets 141 and 142 interposed between the turbocharger 12 and the exhaust pipe 15 .

[Structures of Exhaust Manifold 11 and Turbocharger 12]
An example of a specific structure for moving the turbocharger 12 will be described below.
FIG. 5 is a diagram showing the structure around the fastening means 17 when the turbocharger 12 and the exhaust manifold 11 are coupled. 5 is a cross-sectional view of the turbocharger 12, the exhaust manifold 11, and the fastening means 17, and the direction perpendicular to the plane of FIG. 5 corresponds to the front. FIG. 6 is a diagram showing the shape of the elongated holes 112 and 125. As shown in FIG. FIG. 6A is a diagram showing the shape of the elongated hole 112. FIG. FIG. 6B is a diagram showing the shape of the elongated hole 125. As shown in FIG.

At least one of the turbocharger 12 and the exhaust manifold 11 is formed with an elongated hole whose longitudinal direction is positioned in the thickness direction of the first gasket 141 and the second gasket 142 .

Specifically, in this embodiment, the turbocharger 12 has a female screw hole 124 and a long hole 125 . The female screw hole 124 is a screw hole into which the male screw side of the stud bolt 171 of the fastening means 17 is inserted. The long hole 125 is a hole through which the stud bolt 171 of the fastening means 17 is passed, as shown in FIG. 6(b). The longitudinal direction of the elongated hole 125 is the same as the thickness direction of the first gasket 141 and the second gasket 142 .

Also, in this embodiment, the exhaust manifold 11 has a female screw hole 111 and a long hole 112 . The female screw hole 111 is a screw hole into which the stud bolt 171 of the fastening means 17 is inserted. The long hole 112 is a hole through which the stud bolt 171 of the fastening means 17 is passed, as shown in FIG. 6(a). The longitudinal direction of the slot 112 is the same as the thickness direction of the first gasket 141 and the second gasket 142 .

The turbocharger 12 and the exhaust manifold 11 are coupled by fastening means 17 passed through long holes. The fastening means 17 has stud bolts 171 and nuts 172 .

Stud bolts 171 include those provided on turbocharger 12 and those provided on exhaust manifold 11 . Specifically, some stud bolts 171 are inserted into female screw holes 124 of turbocharger 12 and protrude from turbocharger 12 . Another stud bolt 171 is inserted into the female screw hole 111 of the exhaust manifold 11 and protrudes from the exhaust manifold 11 .

The turbocharger 12 is attached to the exhaust manifold 11 so that the stud bolt 171 inserted into the turbocharger 12 and projected is passed through the elongated hole 112 and the stud bolt 171 inserted into the exhaust manifold 11 and projected is passed through the elongated hole 125. - 特許庁The turbocharger 12 is fixed to the exhaust manifold 11 by tightening the nuts 172 on the respective stud bolts 171 .

In the exhaust structure 1, the stud bolt 171 is provided in this way, so that when the turbocharger 12 is assembled to the exhaust manifold 11, the protruding side of the stud bolt 171 already inserted in one part is passed through the elongated hole in the other part. As a result, the turbocharger 12 is held so as not to drop from the exhaust manifold 11 without the nut 172 or hand support. As a result, in the exhaust structure 1, there is an advantage that the operator does not have to support the turbocharger 12 by hand and can concentrate on the fastening work of the nut 172.

The turbocharger 12 can move in the longitudinal direction of the slot with the fastening means 17 loosened. In this embodiment, the turbocharger 12 can move in the longitudinal direction of the elongated holes 125 and 112 by loosening the nut 172 (it does not have to be completely removed).

In the exhaust structure 1, the turbocharger 12 and the exhaust manifold 11 are thus coupled by the fastening means 17 passed through the elongated hole, and the turbocharger 12 can move in the longitudinal direction of the elongated hole with the fastening means 17 loosened. As a result, the worker can move the turbocharger 12 without taking it down from the exhaust manifold 11, thereby reducing the amount of work. Moreover, since the turbocharger 12 weighs several tens of kilograms, if the worker accidentally drops the turbocharger 12, there is a risk of injury to the leg. Being able to move the turbocharger 12 in the longitudinal direction of the elongated hole in a state where the fastening means 17 is loosened can prevent the turbocharger 12 from falling and ensure the safety of the operator.

[Structure of bracket 18]
FIG. 7 is a diagram showing the structure of the exhaust structure 1 viewed from the lateral side in the vehicle width direction of the vehicle.
The exhaust structure 1 has a bracket 18 . Bracket 18 is a component for positioning turbocharger 12 with respect to exhaust manifold 11 .

In the exhaust structure 1 of this embodiment, as described above, the turbocharger 12 is configured to be movable in the longitudinal direction of the vehicle. While the engine is running, the turbocharger 12 needs to be positioned at a predetermined fixed position shown in FIG. 4(a), but since the turbocharger 12 is movable, it is assumed that it will be installed at a position closer to the position shown in FIG. 4(b) during vehicle manufacturing or maintenance. At this time, if the turbocharger 12 is fastened and fixed in such a manner that it deviates from the predetermined position beyond the bead range of a gasket (not shown) that seals the gas connection between the exhaust manifold 11 and the turbocharger 12, the gasket bead protrudes into the gas flow path, and the gasket bead cannot be sufficiently crushed, and gas leakage may occur.

Therefore, the exhaust structure 1 of this embodiment has a configuration in which the turbocharger 12 is attached to a predetermined fixed position by the bracket 18 . Specifically, a portion of bracket 18 is connected to the cylinder block of engine 2 . Another part of the bracket 18 is fixed to a part of the exhaust pipe 15 or a part of a member connected to the exhaust pipe 15 . By fixing the exhaust pipe 15 at a predetermined position, the bracket 18 can also fix the longitudinal position of the exhaust brake device 13 at a predetermined position.

In the exhaust structure 1, having such a bracket 18 allows the turbocharger 12 to be positioned at an appropriate position, and as a result, as described with reference to FIGS. Also, a gasket (not shown) that seals the gas connection between the exhaust manifold 11 and the turbocharger 12 can function normally to prevent gas leakage.

FIG. 7 shows an example in which the bracket 18 and the exhaust pipe 15 are joined to position the turbocharger 12 with respect to the exhaust manifold 11. However, considering the above-described purpose of functioning the sealing performance of the gasket, it is not necessary to limit the structure of the joined parts to that shown in FIG. For example, the bracket 18 and the exhaust brake device 13 may be joined, or the bracket 18 and the turbocharger 12 may be directly joined.

Bracket 18 has a receiving surface 181 . The receiving surface 181 is a surface extending in a direction orthogonal to the thickness direction of the first gasket 141 and the second gasket 142, and is a surface with which a portion of the exhaust pipe 15 or a portion of a member coupled to the exhaust pipe 15 abuts. The bracket 18 is connected to a part of the exhaust pipe 15 or a part of the member connected to the exhaust pipe 15 by inserting the connecting member 19 into a hole formed in the part of the exhaust pipe 15 or a part of the member connected to the exhaust pipe 15 and a hole formed in the receiving surface 181 and tightening it. The coupling member 19 is, for example, a bolt.

In the exhaust structure 1 , having the bracket 18 having the receiving surface 181 in this manner allows the turbocharger 12 to be positioned with respect to the exhaust manifold 11 more accurately.

[The state where the engine 2 and the exhaust structure 1 are attached to the vehicle]
FIG. 8 is a diagram showing a state in which the engine 2 and the exhaust structure 1 are attached to the vehicle.
The vehicle is provided with side frames 4 and wheels 5 . The side frames 4 extend in the longitudinal direction of the vehicle. The vehicle is provided with two side frames 4 in the width direction of the vehicle. The engine 2 is provided on the side frame 4 . The engine 2 is inclined with respect to the horizontal direction so that the front side of the engine 2 is positioned higher than the rear side of the engine 2 when it is attached to the vehicle.

Therefore, when the engine 2 is attached to the vehicle, the elongated hole of the exhaust structure 1 connected to the engine 2 is inclined with respect to the horizontal direction so that the front end of the elongated hole is positioned higher than the rear end of the elongated hole. As a result, when the engine 2 is attached to the vehicle, the turbocharger 12 can be easily moved to the rear side of the vehicle, and the turbocharger 12 can be kept positioned on the rear side by its own weight.

[Modification]
In the above embodiment, an example in which the elongated holes are formed in the turbocharger 12 and the exhaust manifold 11 is shown, but the present invention is not limited to this. The slot may be formed only in either turbocharger 12 or exhaust manifold 11 .

[Effects of the exhaust structure 1 according to the present embodiment]
The exhaust structure 1 according to the present embodiment has a turbocharger 12 provided in the exhaust manifold 11 so that the position relative to the exhaust manifold 11 is variable in the thickness direction of the first gasket 141 and the second gasket 142, which are parallel to a predetermined reference line.

As a result, in the exhaust structure 1 , the position of the turbocharger 12 with respect to the exhaust manifold 11 can be changed in the thickness direction of the first gasket 141 and the second gasket 142 . Therefore, in the exhaust structure 1, the length between the turbocharger 12 and the exhaust pipe 15 can be made longer than the lengths of the exhaust brake device 13 and the first gasket 141 and the second gasket 142 before being arranged between the turbocharger 12 and the exhaust pipe 15. Therefore, in the exhaust structure 1 , the exhaust brake device 13 can be easily inserted with the plurality of gaskets 141 and 142 interposed between the turbocharger 12 and the exhaust pipe 15 .

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist. For example, all or part of the device can be functionally or physically distributed and integrated in arbitrary units. In addition, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

Reference Signs List 1 Exhaust structure 11 Exhaust manifold 111 Female screw hole 112 Long hole 12 Turbocharger 121 Turbine 122 Shaft 123 Compressor 124 Female screw hole 125 Long hole 13 Exhaust brake device 141 First gasket 142 Second gasket 15 Exhaust pipe 16 Exhaust gas purification device 17 Fastening means 171 Stud bolt 172 Nut 18 Bracket 181 Receptacle Surface 19...Coupling member 2...Engine 31...Intake passage 32...Intake manifold 4...Side frame 5...Wheel

Claims (3)

an exhaust manifold through which the exhaust gas generated by the engine of the vehicle passes;
a turbocharger through which the exhaust gas flowing out from the exhaust manifold increases the density of air flowing into the engine;
an exhaust pipe through which the exhaust gas passes;
an exhaust brake device disposed between the turbocharger and the exhaust pipe with a first gasket and a second gasket interposed therebetween, capable of braking the vehicle by passing the exhaust gas flowing out from the turbocharger, and connected to the turbocharger ;
a bracket for positioning the turbocharger with respect to the exhaust manifold by fixing the exhaust pipe connected to the exhaust brake device to the engine;
with
An exhaust structure in which the turbocharger, the first gasket, the exhaust brake device, the second gasket, and the exhaust pipe are connected so as to line up along a predetermined reference line,
The turbocharger is provided in the exhaust manifold so that the position with respect to the exhaust manifold is variable in the thickness direction of the first gasket and the second gasket, which is a direction parallel to the reference line ,
The bracket is an exhaust structure for positioning the turbocharger at a predetermined fixed position where the turbocharger approaches the exhaust pipe . At least one of the turbocharger and the exhaust manifold is formed with an elongated hole whose longitudinal direction is located in the thickness direction of the first gasket and the second gasket,
The turbocharger and the exhaust manifold are coupled by fastening means passed through the elongated holes,
The exhaust structure according to claim 1. The bracket is
a receiving surface extending in a direction orthogonal to the thickness direction of the first gasket and the second gasket, the receiving surface being in contact with a portion of the exhaust pipe or a portion of a member coupled to the exhaust pipe;
The exhaust structure according to claim 1 or 2 .

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