JPS6325301Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat shielding device for an exhaust system in an internal combustion engine of an automobile or the like.

In this type of internal combustion engine, especially an internal combustion engine with so-called exhaust purification measures, the surface temperature of the exhaust system components such as the exhaust pipe, muffler, or catalyst device is high, so other objects do not come into contact with them. It is known to attach a heat shield plate along the length of the exhaust system member below or above the exhaust system member in order to prevent the exhaust system member from being adversely affected by heat.

In this case, it is necessary to allow for a difference in thermal expansion due to a temperature difference between the exhaust system member and the heat shield plate, particularly a deviation due to a difference in elongation in the longitudinal direction, and various proposals have been made in the past.

It is an object of the present invention to provide a mounting device for a heat shield plate for an exhaust system with a simple structure and to be able to smoothly absorb deviations due to differences in elongation between the heat shield plate and the exhaust system members.

That is, in a heat shielding device for an exhaust system 1 in which a heat shield plate 2 is provided along the length of an exhaust system member such as an exhaust pipe 11, the support band 3 of the heat shield plate 2 is attached to the exhaust system member 11. The end portion 31 of the support band 3 is tightened and fixed along the outer peripheral surface with a fixing device 4, and the fixing device 4 is provided with a claw 41, and a cross section is formed along the longitudinal direction of the side edge of the heat shield plate 2. The present invention is characterized in that a substantially U-shaped bent portion 21 is formed, and the bent portion 21 is elastically held between the claw 41 of the fixing tool 4 and the end portion 31 of the support band 3.

The illustrated example is an exhaust pipe 11 in an automobile exhaust system 1.
This is applied to a heat shield device. That is, as shown in FIG.
The exhaust pipe 11 is formed in the shape of a gutter with a substantially semicircular cross section and is substantially concentric with the exhaust pipe 11, and is disposed with a space 5 on the lower surface of the exhaust pipe 11. The heat shield plate 2 is slidably supported by a plurality of support bands 3, 3 which are fastened and fixed to the exhaust pipe 11 using the fasteners 4. However, any one of the plurality of support bands 3, 3 mentioned above
It may also be non-slidably fixed to one.

For example, as shown in FIG. 2a, the support band 3 includes a pair of approximately semicircular bands 3a and 3b formed concentrically with the exhaust pipe 11, and arranged facing each other on the circumferential surface of the exhaust pipe 11. Both ends 3 of 3a and 3b
1 and 31 to fixing devices 4 such as bolts 4a and nuts 4b.
Tighten and secure. Then, between the claw 41 formed on the fixing tool 4 and the end 31 of the support band 3, a bent portion 21 having a substantially U-shaped cross section formed on both side edges of the heat shield plate 2 is sandwiched. The heat shield plate 2 is elastically and slidably held on the support band 3 by the elasticity of the bolt 4a.
1 and the bent portion 21 is sandwiched between the bent portion 21 and the band end portion 31. Also, in the same figure b, the nail 4 is attached to the nut 4b.
1 and a bent portion 21 between the band end portion 31 and the band end portion 31.
An example is shown below.

Further, as shown in FIG. 3, the support band 3 is formed into a substantially circular shape and is wrapped around the outer circumference of the exhaust pipe 11.
Overlap both ends 31, 31 of the band 3 and bolt 4
A, a fixing device 4 such as a nut 4b may be used to tighten and fix. In that case, one side bent portion 21a of the heat shield plate 2
is supported using the bolt 4a, nut 4b, or washer for tightening the band as in the case of the example shown in FIG.
It is supported by being sandwiched between the bent protrusion 33 formed in the shape of the bent protrusion 33 and the claw 33a formed by cutting and raising a part of the bent protrusion 33.

Note that although the illustrated example shows an example in which the heat shield plate 2 is provided on the lower surface of the exhaust pipe 11, it may be provided on the upper surface of the exhaust pipe 11 or on both upper and lower surfaces. Further, the invention is applicable not only to the exhaust pipe 11 but also to the muffler 12 and other exhaust system members.

Since the present invention has the above-mentioned configuration, it is possible to attach the heat shield plate 2 extremely easily by using the fixing tool 4 for attaching the support band 3 to the exhaust pipe 11, etc., and the side of the heat shield plate 2 Since the bent portion 21 having a U-shaped cross section is formed on the edge and is elastically held between the claw 41 formed on the fixing member 4 and the end portion 31 of the support band 3, the above-mentioned U-shaped folding is possible. The elasticity of the curved portion 21 allows the heat shield plate 2 to be slidably held by the support band 3 in a vibration-proof manner. Therefore, compared to the case where the support band of the heat shield plate slides against the exhaust pipe as in, for example, Japanese Utility Model Application Publication No. 55-137213, the sliding area is extremely small to reduce the sliding resistance and the occurrence of sliding. This makes it possible to reduce as much as possible the noise caused by the exhaust pipe 11, and there is no inconvenience that the anti-corrosion treatment applied to the surface of the exhaust pipe 11 is worn out by the sliding of the support band, resulting in a decrease in durability. Matami Kosho 55-
When the support band of the heat shield plate is fixed to the exhaust pipe etc. by welding as in Publication No. 48097, there is a risk of corrosion from the welded parts and loss of durability, but the present invention does not have such problems. It is durable and has the effect that the heat shield plate can be held slidably and in a vibration-proof manner without using an elastic support member such as a leaf spring as in the above-mentioned publication.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an exhaust system of an internal combustion engine equipped with the heat shielding device of the present invention, FIGS. 2a and 2b are cross-sectional views of its main parts, and FIG. 3 is a cross-sectional view of a modification thereof. 1 is an exhaust system, 11 is an exhaust pipe, 12 is a silencer, 2
3 is a heat shield plate, 3 is a support band, 4 is a fixing tool, and 41 is a claw.

Claims (1)

[Scope of utility model registration request] In an exhaust system heat shielding device in which a heat shield plate is provided along the length of an exhaust system member such as an exhaust pipe, the support band of the heat shield plate is supported by aligning the support band of the heat shield plate along the outer peripheral surface of the exhaust system member. Tighten and secure the end of the band with a fastener,
The fixing tool is provided with a claw, and a bent portion having a substantially U-shaped cross section is formed along the longitudinal direction on the side edge of the heat shield plate,
A heat shielding device for an exhaust system in an internal combustion engine, characterized in that the bent portion is elastically held between the claw of the fixing tool and the end of the support band.