JP5424831B2 - Exhaust member heat shield mounting structure - Google Patents

Description

  The present invention relates to a heat shield structure that facilitates attachment to an exhaust member.

Conventionally, exhaust members such as an exhaust pipe of an internal combustion engine of a vehicle are heated to a high temperature because high-temperature exhaust gas combusted in the internal combustion engine passes therethrough. Therefore, a heat shield is attached to other vehicle members arranged around the exhaust member from the internal combustion engine through the vehicle floor to the rear of the vehicle in order to eliminate the influence of radiant heat. Generally, the heat shield plate is made of a thin metal plate and is attached to the exhaust member by welding or the like.

JP 10-2220 A

In order to shield heat around the exhaust member, a plurality of heat shield plates are fixed around the exhaust member by welding or the like. For this reason, there is a problem that the number of work steps increases because welding work is performed for each heat shield plate.

The present invention has been made in view of such technical problems of the prior art, and an object thereof is to weld and fix a plurality of heat shield plates covering the periphery of the exhaust member to the exhaust member with a small number of welding processes.

In the heat shield plate mounting structure in which a plurality of heat shield plates are attached to surround the exhaust member, and at least one heat shield plate and the other heat shield plate are disposed so as to face each other and surround the exhaust member,
Each of the heat shield plates is provided with a weld fixing portion that is welded and fixed in contact with the surface of the exhaust member, and at least one of the heat shield plates is convexly fixed to the other heat shield plate. The tip of the part is provided so as to be in contact with or in contact with the other heat shield plate so as to come into contact with the outer periphery of the exhaust member, and a pair of the weld fixing portions as a pair are welded and fixed to the exhaust member at the same time.

According to the present invention, since the welding fixing portion as a pair of heat shield plates arranged so as to cover the periphery of the exhaust pipe can be welded and fixed to the exhaust member by a single welding operation, the work process is reduced and the welding material is also reduced. There is an effect that can be done.

The side view which shows an attachment state to the exhaust member of the heat shield of 1st Example Sectional view at 2-2 in FIG. The side view which shows an attachment state to the exhaust member of the heat insulation board of 2nd Example The side view which shows an attachment state to the exhaust member of the heat shield of 3rd Example The side view which shows an attachment state to the exhaust member of the heat insulation board of 4th Example Sectional view at 5-5 in FIG. The perspective view of Example 1

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
In a vehicle, an exhaust member passes exhaust gas exhausted from an internal combustion engine through an exhaust gas purification device disposed under the floor of the vehicle, and then reduces noise in a silencer and releases it to the atmosphere from the rear of the vehicle. .

FIG. 1 shows a first embodiment showing an example in which the heat shield plate of the present invention is used for an exhaust pipe for guiding exhaust gas discharged from an internal combustion engine to an exhaust purification device and a silencer.

The heat shield plate 1-a and the heat shield plate 2-a, which are spaced from the outer periphery of the exhaust pipe 3 and cover the periphery in accordance with the outer shape of the pipe, are fixed to the exhaust pipe 3 by welding. Has been.

    Reference numeral 5 denotes a so-called bead formed of a welding material.

The heat shield plate 1-a and the heat shield plate 2-a are spaced apart in the axial direction of the exhaust pipe 3 and have two convex weld fixing portions 4-a, 4-a on one side from the end portion of the heat shield plate. Is provided.

As shown in FIG. 2, the weld fixing portion 4-a is bent into a shape along the outer periphery of the exhaust pipe 3, and the surface of the heat shield plate keeps a distance from the outer periphery of the exhaust pipe 3. It is fixed so as to be parallel to the axial direction.

In the present embodiment, a state in which a heat shield plate is attached to the straight pipe portion of the exhaust pipe 3 is shown, but when it is attached to a bent portion, it is necessary to bend it in accordance with the bent shape of the exhaust pipe 3.

Also, when attaching to exhaust members such as exhaust purifiers and silencers whose outer shape changes in a complicated manner, the length of the welding fixing part of each heat shield plate from the end of the heat shield plate having the required area They are different from each other, and are provided so that both of the weld fixing parts approach or come into contact with each other.

When the heat shield plate 1-a and the heat shield plate 2-a are welded and fixed to the exhaust pipe 3, the heat shield plate 1-a and the heat shield plate 2 are used.
-A welding fixing portion 4-a and welding fixing portion 4-a are fixed by a jig so that they face each other and come close to each other and come into contact with the exhaust pipe 3.

Thereafter, a welding device (not shown) is moved and fixed in accordance with the shapes of the welding fixing portion 4-a and the welding fixing portion 4-a facing each other and close to each other.
In the case of the present embodiment, since the tip portion is a straight line, it is sufficient to move the welding apparatus linearly continuously.

However, when there is a gap slightly wider than the width of the welding device at the tip, it is possible to perform welding continuously while operating the welding device in a zigzag manner.

Thereby, two welding fixing parts 4-a and 4-a which oppose by operation | movement of a welding apparatus once.
Are fixed to the exhaust pipe 3 by welding. In the case of the present embodiment, each of the heat shield plates 1-a and 2-a is provided with four welding fixing portions, and there are a total of eight locations to be welded. There is an effect that welding can be performed.

If the weld fixing portion 4-a and the tip of the welding fixing portion 4-a come into contact with each other and are temporarily fixed by the exhaust pipe 3 with a jig, both welding fixing portions can be fixed more reliably in a single welding process. It becomes.

FIG. 3 shows a second embodiment. Convex weld fixing portions 4-b and 4-b provided at end portions of the heat shield plate 1-b and the heat shield plate 2-b are adjacent to each other in the axial direction of the exhaust pipe 3, and are fixed by welding. The tips of the parts 4-b and 4-b are in the same position in the axial direction.

Thus, the welding apparatus welds and fixes the weld fixing portion 4-b of the heat shield plate 1-b to the exhaust pipe 3, and then proceeds as it is to connect the weld fixing portion 4-b of the heat shield plate 2-b to the exhaust pipe 3. Can be fixed by welding.

Also in this case, as in the first embodiment, the eight heat shielding plates 1-b and 2-b can be welded and fixed to the exhaust pipe 3 at four half of the four places to be welded and fixed.

In the shape of the present embodiment, there is a portion where the length of the convex portion of the welding fixing portion is too long, and even when the tip of the convex portion does not align linearly, there is no possibility that the tip portion will collide and the tip portion overlaps.

FIG. 4 shows a third embodiment. The heat shield plate 1-c, the convex weld fixing portion 4-c provided at the end of the heat shield plate 2-c, and the concave and convex shapes in which the tips of the weld fixing portions 4-c are opposite to each other. These are arranged so as to be in mesh with each other.

  According to this shape, since welding can be performed linearly, the welding time can be shortened.

Further, since the lengths of the weld fixing portions 4-c and the weld fixing portions 4-c of the respective heat shield plates are increased, the welding fixation with the exhaust pipe 3 can be further strengthened.

In this embodiment, the tips of the weld fixing portions facing each other are arranged so that the concave and convex portions are different from each other. However, the same shape is arranged so as to be shifted in the axial direction of the exhaust pipe as in the second embodiment. You may do it.

FIG. 5 shows a fourth embodiment, in which a heat fixing plate 4-d and a welding fixing portion 4-d are provided on one end side of the heat shielding plate 1-d and the heat shielding plate 2-d. The other end side has a heat shield plate 1-d and a part of the heat shield plate 2-d as a concave groove, and the bottom of the groove is brought into contact with the exhaust pipe to ensure a space between the heat shield plate and the exhaust pipe. At the same time, the metal band is turned in the groove and fixed by tightening the bolt.

With this structure, the groove and the exhaust pipe can be slid with each other by the band, so the stress difference is prevented by absorbing the difference in heat extension due to the temperature difference and material difference between the exhaust pipe and the heat shield. The effect that it can be done is obtained.

Instead of the groove, a so-called metal mesh obtained by compressing a metal mesh can be fastened and fixed by a band between the exhaust pipe 3 and the heat shield plate 1-d and the heat shield plate 2-d. Even when the vibration of the internal combustion engine is transmitted, the generation of sound can be prevented and the transmission of heat from the exhaust pipe 3 to the heat shield plate can also be reduced. Furthermore, since the slip is improved, it becomes possible to smoothly absorb the difference in elongation between the exhaust pipe 3, the heat shield plate 1-d, and the heat shield plate 1-d due to heat.

Although each embodiment has been described with a configuration in which two heat shield plates face each other, it is of course applicable to the case where three or more heat shield plates are welded to an exhaust member.

1 ... Heat shield plates 1-a, 1-b, 1-c, 1-d
2 ... Heat shield plates 2-a, 2-b, 2-c, 2-d
3 ... Exhaust pipe 4 ... Weld fixing part 4-a, 4-b, 4-c, 4-d
5 ... weld bead 6 ... support part 10 ... metal band

Claims (4)

In the heat shield plate mounting structure in which a plurality of heat shield plates are attached surrounding the exhaust member, at least one heat shield plate and the other heat shield plate are disposed so as to face each other and surround the exhaust member. The plate is provided with a welding fixing portion that is welded and fixed in contact with the surface of the exhaust member, and the tip of the welding fixing portion that is convex toward the other heat shielding plate is provided on at least one of the heat shielding plates. The exhaust member is shielded by being adjacent to or in contact with the other heat shield plate so as to come into contact with the outer periphery of the exhaust member, and the welding fixing portions of each pair are simultaneously welded and fixed to the exhaust member. Heat plate mounting structure. The heat shield plate mounting structure according to claim 1, wherein the convex weld fixing portion is provided on each of the plurality of heat shield plates. 3. The heat shield plate mounting structure according to claim 1 or 2, wherein the convex weld fixing portion tips are alternately adjacent to each other. The heat shield plate mounting structure according to claim 1, wherein the convex weld fixing portions have a concave and convex shape that meshes with each other.

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