JP2019167916A - Tail pipe, exhaust system structure and vehicle including the same - Google Patents

Abstract

To provide a tail pipe that reduces adverse effect on the circumference by an exhaust gas to be discharged, and to provide an exhaust system structure and a vehicle including the same.SOLUTION: A tail pipe 100 discharges an exhaust gas from an internal combustion engine to the outside. The tail pipe 100 includes: a terminal part 103 having an opening part 104 for discharging the exhaust gas; and a current plate 105 provided to the terminal part 103 and having a deformation part 106 of which curvature varies depending on temperature.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a tail pipe that exhausts exhaust gas, an exhaust system structure, and a vehicle including the same.

  Exhaust gas generated in the internal combustion engine passes through an exhaust gas purification device, a silencer, and the like, is purified and silenced, and is then discharged to the outside from the tail pipe. Conventionally, the shape of the tail pipe has been devised for the purpose of increasing the flow rate of exhaust gas, reducing airflow noise, and the like.

  For example, Patent Document 1 discloses a tail provided with a connecting portion connected to the rear end of the exhaust pipe, and a diameter-expanding portion that extends rearwardly from the connecting portion and has a substantially elliptical cross section. A pipe is disclosed.

JP 2003-41934 A

  Hot exhaust gas exhausted from the tail pipe may adversely affect the surroundings. It is desirable to reduce the adverse effects on the surroundings caused by such high-temperature exhaust gas.

  An object of the present disclosure is to provide a tail pipe, an exhaust system structure, and a vehicle including the tail pipe that reduce adverse effects on the surroundings due to exhaust gas exhausted.

  A tail pipe according to an aspect of the present disclosure is a tail pipe that discharges exhaust gas of an internal combustion engine to the outside, and is provided with an end portion having an opening for discharging the exhaust gas, and provided at the end portion. A rectifying plate having a deformable portion with a varying degree of curvature.

  An exhaust system structure according to an aspect of the present disclosure includes the tail pipe.

  A vehicle according to an aspect of the present disclosure has the exhaust system structure.

  According to the present disclosure, it is possible to reduce adverse effects on the surroundings due to the exhaust gas discharged.

The perspective view which shows the external shape of the tail pipe which concerns on embodiment of this indication Projection diagram for explaining a tail pipe according to an embodiment of the present disclosure Diagram for explaining current plate The figure for explaining the change of the flow of the exhaust gas by the baffle plate

  Hereinafter, each embodiment of the present disclosure will be described in detail with reference to the drawings. However, a more detailed description than necessary, for example, a detailed description of already well-known matters or a duplicate description of substantially the same configuration may be omitted.

  FIG. 1 is a perspective view showing an outer shape of a tail pipe 100 according to an embodiment of the present disclosure. 2A to 2C are projection views (three views) for explaining the tail pipe 100 according to the embodiment of the present disclosure. As shown in FIGS. 1, 2 </ b> A, and 2 </ b> C, the tail pipe 100 is attached to one end of the exhaust pipe 200. The other end of the exhaust pipe 200 is connected to an internal combustion engine (not shown). Exhaust gas generated by driving the internal combustion engine is exhausted from the tail pipe 100 to the outside through the exhaust pipe 200. The exhaust pipe 200 and the tail pipe 100 constitute an exhaust system structure of the internal combustion engine.

  FIG. 2A is a plan view of the tail pipe 100 attached to one end of the exhaust pipe 200. FIG. 2B is a view of the tail pipe 100 and the exhaust pipe 200 as viewed from the opening 104 side described later. FIG. 2C is a side view of the tail pipe 100 attached to one end of the exhaust pipe 200.

  As shown in FIGS. 1 and 2A to 2C, the tail pipe 100 includes a tail pipe body 101, a connecting portion 102, and a terminal portion 103. The connecting part 102 is a part where the tail pipe 100 is connected to the exhaust pipe 200. In the present disclosure, the connection method is not particularly limited, but the tail pipe 100 is connected to one end of the exhaust pipe 200 by, for example, welding at the connection portion 102. In the present embodiment, as shown in FIG. 1, the cross-sectional shape perpendicular to the exhaust gas flow direction of the exhaust pipe 200 is substantially circular, so that the exhaust gas flow direction in the vicinity of the connecting portion 102 of the tail pipe 100 is The vertical cross-sectional shape is also a circular shape having substantially the same diameter as the exhaust pipe 200.

  An opening 104 is provided at the end portion 103 which is the end of the tail pipe 100 opposite to the connecting portion 102. The opening 104 is an opening provided on the most downstream side of the tail pipe 100 in the flow direction of the exhaust gas, and the exhaust gas in the tail pipe 100 is discharged from the opening 104 to the outside.

  In the present embodiment, as shown in FIGS. 1 and 2B, the opening shape of the opening 104 of the tail pipe 100 is substantially rectangular. The opening shape of the opening 104 may be a rectangular shape with chamfered corners. The length (width) W along the major axis direction of the opening 104 is longer than the diameter D of the exhaust pipe 200 having a circular cross section, as shown in FIG. 2A. On the other hand, the length (height) H along the minor axis direction of the opening 104 is shorter than the diameter D of the cross-sectional circular shape of the exhaust pipe 200 as shown in FIG. 2C.

  The opening shape of the opening 104 is configured to be the largest in the cross-sectional area of the flow path in the tail pipe 100. Specifically, the rectangular width W and height H of the opening 104 described above are set such that the area W × H of the opening 104 is the largest in the cross-sectional area of the tail pipe 100. . As a result, the exhaust gas discharged to the outside of the tail pipe 100 is preferably easily diffused.

  The tail pipe main body 101 is provided so as to connect the connecting portion 102 having a circular cross section perpendicular to the exhaust gas flow direction and the opening 104 having a rectangular opening shape as described above. It is composed of a wall body.

  As shown in FIGS. 1 and 2A to 2C, a pair of rectifying plates 105 are attached to two sides along the long axis direction of the rectangular shape of the opening 104. As shown in FIG. 2C, the pair of rectifying plates 105 are attached such that the tip ends face downward when the tail pipe 100 is viewed from the side.

  3A and 3B are diagrams for explaining the rectifying plate 105. FIG. 3A and 3B are enlarged views of the current plate 105 in the side view of the tail pipe 100. As shown in FIGS. 3A and 3B, the rectifying plate 105 has a deformed portion 106 made of a bimetal fixed so that two metal plates 107 and 108 having different coefficients of thermal expansion are bonded to each other so as not to be displaced. For this reason, the degree of curvature of the deforming portion 106 varies depending on the temperature. In this embodiment, as shown in FIGS. 3A and 3B, the entire rectifying plate 105 is configured by the deforming portion 106, but only a part of the rectifying plate 105 is configured by the deforming portion 106. May be.

  In the present embodiment, the deformed portion 106 of the rectifying plate 105 is manufactured using a metal having a higher coefficient of thermal expansion in the lower metal plate 108 than in the upper metal plate 107. With such a configuration, when the temperature of the exhaust gas is the relatively low first temperature, the rectifying plate 105 takes a form that linearly extends downward in a side view as shown in FIG. 3A. . In the present embodiment, the form of the rectifying plate 105 shown in FIG. 3A is referred to as a first form.

  Further, since the lower metal plate 108 has a higher coefficient of thermal expansion than the upper metal plate 107, the lower metal plate 108 becomes higher with the upper metal plate 107 as the exhaust gas temperature rises. Longer than. Accordingly, when the temperature of the exhaust gas is the second temperature higher than the first temperature, the rectifying plate 105 is configured to bend (warp) upward in a side view as shown in FIG. 3B. In the present embodiment, a form shown in FIG. 3B in which the rectifying plate 105 is bent upward in a side view is referred to as a second form.

  Due to the deforming portion 106 deforming in accordance with the temperature in this way, the rectifying plate 105 has the tip shown in FIG. 3A and the tip shown in FIG. It gradually transitions between the second form in which the part is bent.

  With such a rectifying plate 105, the direction of the exhaust gas discharged from the tail pipe 100 varies greatly depending on the temperature of the exhaust gas. 4A and 4B are diagrams for explaining changes in the flow of exhaust gas by the rectifying plate 105. FIG. In FIG. 4A and FIG. 4B, the arrow has shown the direction through which exhaust gas flows. When the temperature of the exhaust gas is a relatively low first temperature, since the rectifying plate 105 is in the first form extending linearly downward, the interior of the tail pipe 100 is shown as indicated by the arrow in FIG. 4A. The exhaust gas that has flown is exhausted downward from the tail pipe 100 by the two rectifying plates 105.

  In general, when the temperature of the exhaust gas is relatively low, the flow rate of the exhaust gas is relatively small and the flow rate is relatively low due to the nature of the internal combustion engine. For this reason, when the temperature of the exhaust gas is low, the low-speed exhaust gas discharged from the opening 104 is difficult to diffuse and easily stay around the tail pipe 100. When the exhaust system structure including the tail pipe 100 is mounted on a vehicle such as a truck, the exhaust system structure is often disposed on the lower side of the vehicle body. However, since heat is easily transmitted upward, The heat of the exhaust gas staying around is transmitted to the vehicle body. If the rectifying plate 105 is not provided on the tail pipe 100, the exhaust gas is discharged at almost the same height as the tail pipe 100, so that the distance between the staying exhaust gas and the vehicle body is short, and the staying exhaust gas A lot of heat is transmitted to the car body. If such a situation occurs, there is a possibility that the parts constituting the vehicle body may be adversely affected by the heat of the exhaust gas, which is not preferable.

  In the tail pipe 100 according to the embodiment of the present disclosure, as described above, when the temperature of the exhaust gas is the first temperature that is relatively low, the exhaust gas is discharged from the tail pipe 100 downward. For this reason, even if the exhaust gas stays around the tail pipe 100, it stays below the tail pipe 100, so that the heat of the exhaust gas is difficult to be transmitted to the vehicle body existing above the tail pipe 100. For this reason, the bad influence to the vehicle body by the heat of exhaust gas can be reduced.

  On the other hand, when the temperature of the exhaust gas rises to the second temperature, the rectifying plate 105 takes the second form. Therefore, as shown in FIG. The exhaust gas is discharged almost linearly in a direction extending the flow direction of the exhaust gas.

  In general, the higher the temperature of the exhaust gas, the higher the flow rate of the exhaust gas and the faster the flow rate. That is, when the rectifying plate 105 has the second temperature in the second form, the exhaust gas is exhausted vigorously from the opening 104 of the tail pipe 100. At this time, since the two rectifying plates 105 are in the second form as shown in FIG. 4B, the exhaust gas is smoothly discharged in a direction extending the flow direction inside the tail pipe 100 and discharged. The exhaust gas is preferably diffused. Thereby, the bad influence to the circumference | surroundings of the tail pipe 100 by the heat | fever of exhaust gas can be suppressed to the minimum.

<Action and effect>
As described above, the tail pipe 100 according to the embodiment of the present disclosure is the tail pipe 100 that discharges the exhaust gas of the internal combustion engine to the outside, and includes the end portion 103 having the opening 104 that discharges the exhaust gas. And a rectifying plate 105 having a deformable portion 106 that is provided at the end portion 103 and has a degree of curvature that varies depending on temperature.

  With such a configuration, the exhaust gas can be discharged in a suitable direction in accordance with the temperature of the exhaust gas, so that adverse effects on the surroundings due to the heat of the exhaust gas can be reduced.

  Moreover, the deformation | transformation part 106 is a bimetal. For this reason, the tail pipe 100 according to the embodiment of the present disclosure can be manufactured simply by attaching the rectifying plate 105 including the deformable portion 106, which is a plate-like member formed using bimetal, to the end portion 103. Therefore, it can be manufactured in a small number of steps and at a low cost, which is preferable.

  Further, when the temperature of the exhaust gas is the first temperature, the rectifying plate 105 discharges the exhaust gas downward in a side view of the tail pipe 100. And when the temperature of exhaust gas is 2nd temperature higher than 1st temperature, the baffle plate 105 discharges exhaust gas toward the direction which extended the flow direction of the exhaust gas in the terminal part 103 from the opening part 104. .

  With such a configuration, when the temperature of the exhaust gas is the first temperature that is relatively low, the exhaust gas is discharged downward from the tail pipe 100. For this reason, when the vehicle body is present on the upper side of the tail pipe 100, even if the exhaust gas stays around the tail pipe 100, the heat of the exhaust gas is difficult to be transmitted to the vehicle body. Can be reduced.

  Further, with such a configuration, when the rectifying plate 105 is at a second temperature higher than the first temperature, the two rectifying plates 105 have a second form bent upward in a side view, and therefore the exhaust gas is The exhaust is smoothly discharged in a direction extending the flow direction inside the tail pipe 100, and the discharged exhaust gas is suitably diffused. Thereby, the bad influence to the circumference | surroundings of the tail pipe 100 by the heat | fever of exhaust gas can be suppressed to the minimum.

  While various embodiments have been described with reference to the drawings, the present disclosure is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the scope of the disclosure. Understood. In addition, the constituent elements in the above embodiments may be arbitrarily combined without departing from the spirit of the disclosure.

  In the embodiment described above, the opening 104 from which the exhaust gas is discharged is formed in a substantially rectangular shape. However, the present disclosure is not limited to this, and for example, the shape of the opening 104 of the tail pipe 100 may be formed in a substantially circular shape like the cross-sectional shape of the exhaust pipe 200. Even in this case, the inner peripheral surface of the end portion 103 of the tail pipe 100 may be formed so as to be curved and spread. Further, the cross-sectional shape perpendicular to the flow of exhaust gas in the exhaust pipe 200 may be formed in, for example, an elliptical shape or a substantially rectangular shape. In this case, the shape of the opening 104 of the tail pipe 100 is the same as that of the exhaust pipe 200. It may be formed in a shape such that the inner peripheral surface is curved and spreads. Further, the opening 104 may be formed in a flat shape as viewed from the flow direction of the exhaust gas, that is, an elliptical shape, a trapezoidal shape, a triangular shape, or the like other than the substantially rectangular shape.

  Moreover, although the flow path cross-sectional area of the opening 104 is configured to be the largest in the tail pipe 100, the present disclosure is not limited to this. In the present disclosure, in order to diffuse the exhaust gas appropriately, the flow passage cross-sectional area of the opening 104 is configured to be the largest. However, for example, when the exhaust pressure near the opening 104 is increased to discharge far away. The flow passage cross-sectional area of the opening 104 may be made smaller than that of other portions. As described above, the opening shape and the channel cross-sectional area of the opening 104 may be suitably changed in accordance with the purpose of use of the tail pipe 100 and the required effect.

  In the above-described embodiment, when the temperature of the exhaust gas is relatively low, the rectifying plate 105 takes the first form extending linearly downward in a side view, and the temperature of the exhaust gas is relatively high Then, the current plate 105 is assumed to take the second form bent upward in a side view. However, the present disclosure is not limited to this. In the second embodiment, the direction in which the current plate 105 is bent may not be upward in the side view, and may be another direction when viewed from the direction other than the side view. Alternatively, the rectifying plate 105 takes a third form bent downward in a side view when the temperature of the exhaust gas is relatively low, and the exhaust gas in the tail pipe 100 in a side view when the temperature of the exhaust gas is relatively high. You may make it take the 4th form extended substantially linearly toward the direction which extended the flow direction.

  That is, the combination of the exhaust gas temperature and the exhaust gas discharge direction controlled by the rectifying plate 105 can be freely changed in accordance with a preferred usage pattern of the exhaust system structure including the tail pipe 100.

  Further, the above-described embodiment is described on the assumption that the bimetal constituting the deformable portion 106 of the rectifying plate 105 is bent in at least one of the first form and the second form. ing. However, for example, in a side view, when there is a bimetal that transitions according to a change in temperature from a linear form toward one angle to another form that is linear toward another angle, the deforming portion 106 is present. Such a bimetal may be used. In this case, when the temperature of the exhaust gas is relatively low, the rectifying plate 105 takes a linear shape downward in a side view, and when the temperature of the exhaust gas is relatively high, the rectifying plate 105 is in the end portion 103 in the side view. What is necessary is just to be comprised so that the other form of linear may be taken toward the extension direction of the flow direction of exhaust gas.

  In the embodiment described above, the deforming portion 106 is a bimetal. However, the present invention is not limited to this, and the deformable portion 106 may be configured so that the exhaust gas discharge direction can be changed depending on the temperature. For example, as the deformable portion 106, a shape memory alloy may be used instead of the bimetal.

  In the above-described embodiment, as illustrated in FIGS. 3A and 3B, the entire rectifying plate 105 is configured by the deformable portion 106, but the present disclosure is not limited thereto, and for example, the rectifying plate 105 Only a part of the deformation unit 106 may be configured. In this case, the rectifying plate 105 may have a configuration in which, for example, a planar rectifying member is attached to the distal end portion of the deformable portion 106. According to such a configuration, even if the deformed portion 106 bends or warps due to the temperature of the exhaust gas, the flow of the exhaust gas is easily rectified by the flat rectifying member, and is more preferable.

  In the above-described embodiment, the current plate 105 is provided on two sides along the long axis direction of the opening 104 formed in a rectangular shape, but the present disclosure is not limited thereto. For example, the current plate 105 may be provided on only one side, may be provided on two sides along the minor axis direction, or may be provided on all four sides. For example, even when the opening 104 is formed in a circular shape, an elliptical shape, an indefinite shape, or the like, the rectifying plate 105 may be provided at any position in the opening 104. In this case, the rectifying plate 105 may be configured to extend in a direction in which the exhaust gas is desired to be discharged.

  The present disclosure is useful for tail pipes that exhaust exhaust gas.

DESCRIPTION OF SYMBOLS 100 Tail pipe 101 Tail pipe main body 102 Connection part 103 Terminal part 104 Opening part 105 Current plate 106 Deformation part 107,108 Metal plate 200 Exhaust pipe

Claims (6)

A tail pipe for discharging the exhaust gas of an internal combustion engine to the outside,
An end portion having an opening for discharging the exhaust gas;
A rectifying plate provided at the end portion and having a deformed portion whose curvature changes with temperature,
With a tail pipe. The deformation part is a bimetal.
The tail pipe according to claim 1. When the temperature of the exhaust gas is the first temperature, the rectifying plate discharges the exhaust gas in a direction other than a direction in which the flow direction of the exhaust gas is extended in the end portion, When the temperature is a second temperature higher than the first temperature, the exhaust gas is discharged in a direction extending the flow direction;
The tail pipe according to claim 1 or 2. The rectifying plate causes the exhaust gas to be discharged downward when the temperature of the exhaust gas is the first temperature;
The tail pipe according to claim 3. Having a tailpipe according to any one of claims 1 to 4,
Exhaust system structure. The exhaust system structure according to claim 5 is provided.
vehicle.

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