JP2004324474A - Heat shield structure of vehicle exhaust pipe system - Google Patents

Abstract

An object of the present invention is to provide a heat shield plate structure of an exhaust pipe system of a vehicle, which can more efficiently prevent the occurrence of heat damage due to an exhaust pipe system, and can reduce assembly cost and mass.
A plurality of heat shield plates (32 to 35) for preventing a rise in temperature of the floor panel (20) due to radiant heat radiated from an exhaust pipe system (21) disposed on a lower surface of a floor panel (20) of the vehicle are provided in the exhaust pipe system (21). Among the heat shield plates 32, 33, and 34, the downstream end portions 32B, 33B, and 34B of the heat shield plates 32, 33, and 34 that are disposed on the upstream side of the plurality of heat shield plates 32 to 35 are provided so as to cover the plurality of heat shield plates 32 to 35. And the upstream end portions 33A, 34A, 35A of the subsequent heat shield plates 33, 34, 35 disposed on the downstream side and the exhaust pipe system 2 from the upstream side to the downstream side while being overlapped. It covers continuously over the whole range.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, a plurality of heat shield plates for preventing a rise in temperature of the floor panel due to radiant heat radiated from an exhaust pipe system provided on a lower surface of a vehicle floor panel are provided so as to cover the exhaust pipe system. The present invention relates to an improvement of a heat shield structure of an exhaust pipe system of an existing vehicle.
[0002]
[Prior art]
Conventionally, as shown in FIG. 5, the catalytic converters 3, 4 and muffler 5, which constitute a part of the exhaust pipe system 2 disposed on the lower surface of the floor panel 1 of the vehicle, are disposed under the floor of the floor panel 1. Further, a plurality of heat shield plates 9 to 12 covering the exhaust tube 7 and the muffler 8 located at the location where the underfloor parts 6 such as a fuel tank are disposed from above and from the side are spaced along the exhaust pipe system 2. 2. Description of the Related Art There is known a heat shield plate structure of an exhaust pipe system of a vehicle that is disposed from an upstream side to a downstream side while being opened (for example, see Patent Document 1).
[0003]
According to this conventional device, since the air flow is guided backward by the ribs (not shown) provided on the heat shield plates 9 to 12, the floor is radiated by the radiant heat radiated from the exhaust pipe system 2. The temperature rise of the panel 1 is prevented by the plurality of heat shield plates 9 to 12.
[0004]
[Patent Document 1]
JP-A-11-5567
[Problems to be solved by the invention]
However, this conventional heat shield plate structure of the exhaust pipe system of a vehicle has a configuration in which the heat shield plate is a divided structure and covers the exhaust pipe system 2 discontinuously from its upstream side and side sides. For example, as shown in FIG. 6, the lower surface of the floor panel 1 of the air heated by the radiant heat Q from the gap H between the heat shield plate 10 on the upstream side and the heat shield plate 11 on the downstream side. Flows into the floor tunnel 13 (see arrow Z1), or due to direct or indirect irradiation with radiant heat Q, there is a problem that heat damage occurs to the underfloor components 6 disposed in the underfloor space of the floor panel 1. .
[0006]
Further, in this conventional device, the heat shield plates 9 to 12 are discontinuously fixed to the lower surface of the floor panel 1, and each of the heat shield plates 9 to 12 is fixed to the floor panel 1. Is required in at least four places, so that the number of parts for assembling each of the heat shield plates 9 to 12 to the floor panel 1 increases, as well as the number of assembling steps, resulting in an increase in assembling cost and an increase in mass. There is.
[0007]
On the other hand, if the integrated heat shield plate is provided on the lower surface of the floor panel 1, the shape of the heat shield plate becomes complicated, which causes inconvenience in transporting parts and complicates assembly work. This leads to the problem that it becomes necessary.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle that can more efficiently prevent the occurrence of heat damage due to an exhaust pipe system, reduce assembly costs, and reduce mass. An object of the present invention is to provide a heat shield plate structure for an exhaust pipe system.
[0009]
[Means for Solving the Problems]
The heat shield plate structure for an exhaust pipe system of a vehicle according to claim 1, wherein a plurality of shields for preventing a rise in temperature of the floor panel due to radiant heat radiated from an exhaust pipe system disposed on a lower surface of the floor panel of the vehicle. In a heat shield plate structure of a vehicle exhaust pipe system in which a hot plate is disposed so as to cover the exhaust pipe system,
The downstream end portion of the heat shield plate disposed on the upstream side of the plurality of heat shield plates and the upstream end portion of the subsequent heat shield plate disposed on the downstream side overlap with each other. In this manner, the exhaust pipe system is continuously covered over the entire range from the upstream side to the downstream side.
[0010]
According to the first aspect of the present invention, it is possible to more efficiently prevent the occurrence of heat damage due to radiant heat from the exhaust pipe system while reducing the assembly cost and the mass.
[0011]
The heat shield plate structure of the exhaust pipe system of a vehicle according to claim 2, wherein a downstream end portion of the heat shield plate disposed on the upstream side is disposed on the downstream side. The upstream end portion of the heat shield plate is covered from above.
[0012]
According to the invention described in claim 2, the downstream end portion of the heat shield plate disposed on the upstream side is set to the upstream end portion of the heat shield plate disposed on the downstream side. Therefore, the opening between the heat shield plates from the exhaust pipe system to the floor panel faces the rear of the vehicle, and is in a direction opposite to the flow of air flowing from the front to the rear of the vehicle.
[0013]
For this reason, it is possible to prevent the air heated on the upstream side from flowing to the floor panel portion, and thus it is possible to prevent the underfloor components and the indoor components from being affected by the radiant heat from the exhaust pipe system.
[0014]
The heat shield plate structure of the exhaust pipe system of a vehicle according to claim 3 is provided at a downstream end portion of the heat shield plate provided at the upstream side and at the downstream side. A stop portion for stopping both heat shield plates to the floor panel is provided in a portion overlapping with an upstream end portion of a subsequent heat shield plate.
[0015]
According to the third aspect of the present invention, since the stop portions are provided at the overlapping portions of the heat shield plates, the number of parts and the number of assembling steps can be reduced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a schematic view of a heat shield plate structure of an exhaust pipe system of a vehicle according to the present invention. In FIG. 1, reference numeral 20 denotes a floor panel, 21 denotes an exhaust pipe system, 22 denotes a floor tunnel, and 23 denotes a fuel tank or the like. Underfloor parts. As shown in FIG. 2, the exhaust pipe system 21 has catalytic converters 24 and 25, mufflers 26 and 27, and exhaust tubes 28 to 31 that connect these components.
[0017]
The catalytic converter 24 is connected to an engine (not shown), and the exhaust gas discharged from the engine is discharged to the outside via the catalytic converters 24 and 25 and the mufflers 26 and 27.
[0018]
As shown in FIGS. 1 and 2, the exhaust pipe system 21 has its upstream side and side sides covered by a plurality of divided heat shield plates 32 to 35. The downstream end portion of the heat shield plate on the upstream side and the upstream end portion of the heat shield plate on the downstream side overlap each other.
[0019]
The heat shield plate 32 mainly covers the catalytic converters 24 and 25, the heat shield plate 33 mainly covers the muffler 26, and the heat shield plate 34 is mainly disposed at a location corresponding to the underfloor component 23 such as a fuel tank. The heat shield plate 35 is mainly used to cover the exhaust tube 31 and the muffler 27.
[0020]
Here, in the relationship between the heat shield plate 32 and the heat shield plate 33, the heat shield plate 32 is the heat shield plate on the upstream side, and the heat shield plate 33 is the heat shield plate on the downstream side. It is. In the relationship between the heat shield plate 33 and the heat shield plate 34, the heat shield plate 33 is a heat shield plate on the upstream side, and the heat shield plate 34 is a subsequent heat shield plate on the downstream side, In the relationship between the heat shield plate 34 and the heat shield plate 35, the heat shield plate 34 is a heat shield plate on the upstream side, and the heat shield plate 35 is a subsequent heat shield plate on the downstream side.
[0021]
Each of the heat shield plates 32-35 has a configuration in which the downstream end portion of the heat shield plate on the upstream side is covered by the upstream end portion of the subsequent heat shield plate on the downstream side. In FIG. The downstream end of the heat plate 32, 33A is the upstream end of the heat shield 33, 33B is the downstream end of the heat shield 33, 34A is the upstream end of the heat shield 34, 34B is the downstream end of the heat shield 34. A portion 35A indicates an upstream end portion of the heat shield plate 35.
[0022]
FIG. 3 is a cross-sectional view showing a portion from the muffler 26 to the exhaust tube 30 in FIG. 1, and the downstream portion of the heat shield plate 33 on the upstream side approaches the exhaust tube 30 as going downstream. It has an inclined portion 33C, and a downstream side of the inclined portion 33C is a downstream end portion 33B. FIG. 3 shows a state in which the downstream end portion 33B is covered with an upstream end portion 34A of the succeeding heat shield plate 34 on the downstream side, and FIG. A sectional view along the line is shown.
[0023]
The heat shield plate 32 is provided with four stop portions 32a to 32d, the heat shield plate 33 is provided with four stop portions 33a to 33d, and the heat shield plate 34 is provided with four stop portions 34a to 34d. The heat shield plate 35 is provided with four stop portions 35a to 35d.
[0024]
The stop portions 33a and 33b of the upstream end portion 33A of the heat shield plate 33 are overlapped with the stop portions 32c and 32d of the downstream end portion 32B of the heat shield plate 33, and the stop portions 33c and 33d of the downstream end portion 33B of the heat shield plate 33. Are placed on the stop portions 34a, 34b of the upstream end portion 34A of the heat shield plate 34, and the stop portions 34c, 34d of the downstream end portion 34B of the heat shield plate 34 are stopped portions 35a, 35a of the upstream end portion 35A of the heat shield plate 35. It is superimposed on 35b, and is fixed to the lower surface of the floor panel 1 by studs 36 and nuts 37 as shown in FIG.
[0025]
Thus, according to the embodiment of the present invention, the downstream end portion of the heat shield plate on the upstream side and the upstream end portion of the heat shield plate on the downstream side overlap each other, and Is achieved, the number of parts and the number of assembling steps can be reduced, and the mass of the vehicle can be reduced.
[0026]
According to the embodiment of the present invention, the downstream end portion of the heat shield plate on the upstream side of the plurality of divided heat shield plates and the upstream end portion of the heat shield plate on the downstream side. As shown in FIG. 3, the exhaust pipe system is continuously covered from the upper side and the side side from the upstream side to the downstream side along the exhaust pipe system 2 while overlapping each other. In addition, the radiant heat Q from the exhaust pipe system 2 and the air heated by the radiant heat Q can be prevented from leaking into the floor tunnel 22, and the underfloor components 23, the floor panel 1, disposed below the floor of the floor panel 1. It is possible to further prevent heat damage to components disposed on the indoor side of the floor panel 1. In FIG. 3, arrow Z2 indicates the flow of the heated air, and symbol J indicates the overlapping portion between the heat shield plates.
[0027]
Also, since the upstream end portion of the heat shield plate disposed on the downstream side covers the downstream end portion of the heat shield plate disposed on the upstream side from above, for example, As shown in FIG. 3, the space S1 between the downstream end portion of the heat shield plate on the upstream side and the exhaust pipe system 2 is located between the upstream end portion of the heat shield plate on the downstream side and the exhaust pipe system 2. The opening between the heat shield plates from the exhaust pipe system 2 to the floor panel 1 faces the rear of the vehicle, and is opposite to the flow of air flowing from the front to the rear of the vehicle. become.
[0028]
For this reason, the air heated on the upstream side can be prevented from flowing to the floor panel portion, and therefore, the influence of the radiant heat from the exhaust pipe system on the underfloor components and the indoor components can be prevented.
[0029]
【The invention's effect】
According to the first aspect of the present invention, the under-floor components disposed under the floor panel, the components disposed on the floor panel, and the indoor side of the floor panel while reducing assembly cost and mass. There is an effect that heat damage to the arranged components can be further avoided.
[0030]
According to the invention described in claim 2, the downstream end portion of the heat shield plate disposed on the upstream side is set to the upstream end portion of the heat shield plate disposed on the downstream side. Therefore, the opening between the heat shield plates from the exhaust pipe system to the floor panel faces the rear of the vehicle, and is in a direction opposite to the flow of air flowing from the front to the rear of the vehicle.
[0031]
For this reason, it is possible to prevent the air heated on the upstream side from flowing to the floor panel portion, and thus it is possible to prevent the underfloor components and the indoor components from being affected by the radiant heat from the exhaust pipe system.
[0032]
According to the third aspect of the present invention, since the stop portions are provided at the overlapping portions of the heat shield plates, the number of parts and the number of assembling steps can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a structure of an exhaust pipe system of a vehicle according to the present invention.
FIG. 2 is a view of the exhaust pipe system of the vehicle shown in FIG. 1 as viewed from a lower surface side of a floor panel.
FIG. 3 is a sectional view taken along line AA of FIG.
FIG. 4 is a sectional view taken along line BB of FIG. 2;
FIG. 5 is a view of an exhaust pipe system of a conventional vehicle viewed from a lower surface side of a floor panel.
FIG. 6 is a sectional view taken along line CC of FIG. 5;
[Explanation of symbols]
20 floor panel 21 exhaust pipe system 32-35 heat shield plate 32B, 33B, 34B downstream end portion 33A, 34A, 35A upstream end portion

Claims (3)

A vehicle in which a plurality of heat shields for preventing a rise in temperature of the floor panel due to radiant heat radiated from an exhaust pipe system provided on a lower surface of a floor panel of the vehicle are arranged so as to cover the exhaust pipe system. In the heat shield plate structure of the exhaust pipe system,
The downstream end portion of the heat shield plate disposed on the upstream side of the plurality of heat shield plates and the upstream end portion of the subsequent heat shield plate disposed on the downstream side overlap with each other. A heat shield plate structure for a vehicle exhaust pipe system, wherein the exhaust pipe system is continuously covered over the entire range from the upstream side to the downstream side. The upstream end portion of the heat shield plate disposed on the downstream side covers the downstream end portion of the heat shield plate disposed on the upstream side from above. A heat shield plate structure for an exhaust pipe system of a vehicle according to claim 1. Both shields are provided at the overlapping portion of the downstream end of the heat shield provided on the upstream side and the upstream end of the subsequent heat shield provided on the downstream. The heat shield plate structure for an exhaust pipe system of a vehicle according to claim 2, wherein a stop portion for stopping a heat plate on the floor panel is provided.

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