JPS6318005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for a heat shield plate in an automobile exhaust pipe.

In recent years, exhaust purification devices such as thermal reactors and catalytic converters have been added to automobile engine exhaust systems.
Since harmful components such as HC and CO in the exhaust gas emitted from the engine are re-burned and purified, the exhaust pipe downstream of the exhaust purification device tends to become hotter.
If the exhaust pipe becomes hot in this way, dry grass etc. may come into contact with the exhaust pipe and cause a fire, or the vehicle floor may become abnormally hot. As a result, the lower or upper part of the exhaust pipe is covered with a heat shield plate. An example of this conventional heat shield mounting structure will be explained with reference to FIGS. The plate 2 is attached to cover the lower side of the exhaust pipe 1 with a bracket 3 made of a band-shaped sheet metal. The bracket 3 is composed of a holding part 4 that holds approximately the upper half of the exhaust pipe 1, and flange parts 5 extending from both sides of the holding part 4 in the left-right direction.
On the other hand, mounting seats 6 are partially extended on both sides of the heat shield plate 2, and a support portion 7 that abuts the lower surface of the exhaust pipe 1 is formed in a bulge at the center of the lower surface. There is. When installing the heat shield plate 2, the heat shield plate 2 is applied to the lower side of the exhaust pipe 1, and the holding part 4 of the bracket 3 is applied to the upper side of the exhaust pipe 1, and then the flange of the bracket 3 is attached. The portion 5 and the mounting seat 6 of the heat shield plate 2 are aligned, and both are tightened with bolts and nuts 8 to be assembled.

However, in such a conventional structure, the flange portion 5 of the bracket 3 and the mounting seat 6 of the heat shield plate 2 protrude greatly in the lateral direction, so that other components disposed adjacent to the exhaust pipe 1 on the underside of the vehicle floor This results in problems that place constraints on the layout of functional parts and narrow the degree of freedom in design. Also, attach the mounting seat 6 of the heat shield plate 2 to the flange portion 5 of the bracket 3.
Along with extending outward to match the protruding dimension of
The overall width of the heat shield plate 2 becomes larger, which further exacerbates the above-mentioned problem, and the increase in the size of the heat shield plate 2 not only becomes disadvantageous in terms of materials, but also makes it difficult to reduce the weight of the vehicle even a little. Despite this requirement, the drawback was that the vehicle weight was increased.

In view of the conventional situation, the present invention optimally specifies the joining position between the flange portion of the bracket and the mounting seat of the heat shield plate, thereby moving the joint portion between the heat shield plate and the bracket toward the side of the exhaust pipe. This eliminates protrusions and allows the width dimension to be narrowed within a range that does not interfere with the heat shield plate and its heat shielding effect.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

That is, in the present invention, as illustrated in FIGS. 3 and 4, the bracket 10 includes a holding part 12 that holds approximately the upper half of the exhaust pipe 1, and a holding part 12 that holds the exhaust pipe 1 from both sides of the holding part 12. An arm portion 13 extending in the tangential direction of the outer periphery is provided, and the joining position of the end portion of the arm portion 13 and the heat shield plate 11 is located inside the outer surface of the arm portion 13 and below the exhaust pipe 1. It is set towards the center.
In this embodiment, the heat shield plate 11 is disposed to cover the lower side of the exhaust pipe 1 as a measure against dry grass, but the heat shield plate 11 is disposed to cover the upper side of the exhaust pipe 1 as a measure to prevent heating of the vehicle floor. When disposed, the above-mentioned coupling position will be near the upper center of the exhaust pipe 1. here,
When setting the connection position mentioned above, set bracket 1.
A holding part 12 that holds approximately the upper half of the exhaust pipe 1 and arm parts 13 and 13 that extend obliquely downward from both sides of the holding part 12, respectively.
and flange portions 14, 14 formed by bending the ends of these arm portions 13, 13 inward, respectively.
The flange portions 14 and 1 are integrally formed near both sides of the support portion 15 at the center of the bottom of the heat shield plate 11.
4 are in contact with the mounting seats 16, 16, and an extension part 16a is formed from these mounting seats 16, 16 toward the center of the side of the exhaust pipe 1. By aligning the brackets 16 and connecting them with bolts and nuts 17, the heat shield plate 11 is fixed to the lower side of the exhaust pipe 1 without any movement due to the spring back action of the bracket 10 and the heat shield plate 11. . Note that, depending on the case, the holding portion 12 of the bracket 10 may be fixed to the exhaust pipe 1 in advance by means such as welding or caulking.

The embodiment shown in FIG. 5 is a case in which the bracket 10 is formed of a pipe material, and the central part of the bracket 10 is crushed to form a holding part 12 that holds approximately the upper half of the exhaust pipe 1, and Screw holes 1 are provided at the ends of arm portions 13 and 13 extending obliquely downward from both sides of the holding portion 12.
8, 18 are formed, and these arm portions 13, 1
3 ends and the mounting seats 16, 16 of the heat shield plate 11 are aligned, and the joining surface 20 is located on the inner side of the outer surface 13a of the bracket 10, and the mounting seats 16, 16 are aligned.
Insert bolts 17a, 17 into screw holes 18, 18 from the bottom surface.
The bracket 10 and the heat shield plate 11 are connected by screwing in the bracket 10 and the heat shield plate 11. In addition, depending on the case, bracket 10
It is also possible to form a rod using a rod in the same manner as described above.

With the above configuration, the bracket 10 and the heat shield plate 1
1, specifically, the joint surface between the flange portion 14 or the end of the arm portion 13 and the mounting seat 16 is the exhaust pipe 1.
The width dimension of the heat shield plate 11 does not protrude to the side significantly, and the width dimension of the heat shield plate 11 does not interfere with the heat shielding effect of the exhaust pipe 1 due to the setting of the connection position near the bottom or upper center of the exhaust pipe 1. In other words, the width can be narrowed to the extent that the width is slightly wider than the diameter of the exhaust pipe 1, and this does not place restrictions on the layout of other functional parts arranged adjacent to the exhaust pipe 1 on the underside of the vehicle body floor. Furthermore, the heat shield plate 11 can be made smaller, thereby reducing the weight of the vehicle and reducing costs. This has many practical effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a conventional structure, FIG. 2 is a sectional view taken along the line - in FIG. 1, FIG. 3 is a plan view showing an embodiment of the present invention, and FIG. ―
FIG. 5 is a cross-sectional view along a line showing a different embodiment of the invention. 1... Exhaust pipe, 10... Bracket, 11...
Heat shield plate, 12... Holding part, 13... Arm part, 1
4...Flange portion, 16...Mounting seat, 17...Bolt/nut, 17a...Bolt, 18...Screw hole, 20...Connection surface.

Claims (1)

[Claims] 1. In a structure in which a heat shield plate that covers the lower side or upper side of the exhaust pipe is attached to the exhaust pipe via a bracket, the bracket includes a holding portion that holds approximately the upper half circumference or approximately the lower half circumference of the exhaust pipe; Arms extend from both sides of the holding part in a tangential direction to the outer periphery of the exhaust pipe, and the connection position between the end of the arm and the heat shield is located inward from the outer surface of the arm to exhaust air. A mounting structure for an exhaust pipe heat shield plate, characterized in that it is set closer to the lower center of the pipe or closer to the upper center of the pipe.