JPH0660730U - Exhaust pipe heat shield plate mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a heat shield plate mounting structure for exhaust pipes that can reduce the thickness of the heat shield plate without increasing the number of parts. [Structure] The exhaust pipe 1 is attached to the arc-shaped components 3 and 4 of the heat shield plate 2.
A piercing burring 10 is formed protruding to the side, and a protrusion 16 is formed in the clamp 5 at a position corresponding to each piercing burring of the component piece. Piercing burring hole 1
1 is projected through to the center side of the component piece, and the tip of the protrusion is brought into contact with the exhaust pipe by tightening the clamp. As a result, the clamp is clamped and fixed directly to the exhaust pipe, and the component pieces of the heat shield plate are securely held in the clamp without the holes of the plurality of pierce burrings engaging with the protrusions and coming off from the protrusions. . The heat shield plate can be thinned without fear of cracking due to sliding with the exhaust pipe.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat shield plate mounting structure for an exhaust pipe connected to an engine of a vehicle or the like.

[0002]

[Prior art]

 The exhaust pipe of an engine of a vehicle or the like may reach a temperature of, for example, about 700 ° C. in a portion near the exhaust manifold. A heat shield plate is attached to the exhaust pipe to prevent direct contact of dead grass etc. with the hot exhaust pipe or to prevent the radiant heat of the exhaust pipe from heating the floor of the passenger compartment. It is provided. As a conventional heat shield plate mounting structure for this kind of exhaust pipe, there is, for example, one disclosed in Japanese Utility Model Laid-Open No. 62-84620. As shown in FIG. 4, this is provided with a tubular heat shield plate on the outer side of the exhaust pipe with a gap therebetween.

The heat shield plate 32 is made up of constituent pieces 33 and 34 having an arcuate cross section which is divided into two parts, which are clamped and fixed by a clamp 35. Here, in order to reduce the number of parts, instead of using a support of another member to form the gap, the end portions of the heat shield plate constituent pieces 33 and 34 are bent in the inner diameter direction and the exhaust pipe is formed. The support portion 37 is in contact with 1.

[0004]

[Problems to be solved by the device]

 Here, the clamp 35 needs to have a certain plate thickness in order to maintain a predetermined tightening force, but the heat shield plate does not need to have such a thickness. Therefore, if the component piece is a thin plate, the weight is further reduced. And the cost can be reduced. However, in the conventional heat shield plate mounting structure described above, when the end portions of the heat shield plate constituent pieces 33, 34 are brought into contact with the exhaust pipe 1 as a support portion, the exhaust pipe 1 is in a high temperature state. Since the heat shield plate 32 is cooled by air and has a relatively low temperature, the heat shield plate constituent pieces 33 and 34 and the exhaust pipe 1 slide repeatedly due to the difference in thermal expansion.

As a result, a crack may occur at the contact portion of the thin heat shield plate with the exhaust pipe. If there is a crack, the support part loses its function, and the tightening force given by the clamp is reduced, causing backlash and even falling off of the heat shield plate. Therefore, the heat shield plate cannot be made into a thin plate, and there is a limit to cost reduction and weight reduction. Further, for the same reason, there is a problem that it is difficult to improve fuel efficiency. Therefore, in view of the above-mentioned conventional problems, an object of the present invention is to provide an exhaust pipe heat shield mounting structure capable of reducing the thickness of the heat shield without increasing the number of parts.

[0006]

[Means for Solving the Problems]

 For this reason, the present invention is an exhaust pipe heat shield plate mounting structure in which a heat shield plate provided outside the exhaust pipe with a gap is clamped and fixed by a clamp, and the clamp protrudes toward the exhaust pipe side. A plurality of protrusions are formed, and a plurality of engaging portions corresponding to the above-mentioned protrusions are formed on the heat shield plate.When the protrusions are fitted into the engaging portions of the heat shield plate and the clamp is tightened, It is assumed that either the protrusion or the engaging portion is configured to come into contact with the exhaust pipe to form the gap.

[0007]

[Action]

 A plurality of protrusions are formed on the clamp, and a plurality of engaging portions are formed on the heat shield plate, so that the protrusions are fitted to the engaging portions, and either the protrusions or the engaging portions are brought into contact with the exhaust pipe. As a result, the projection or engaging part that is in contact with the exhaust pipe forms a gap between the heat shield plate and the exhaust pipe, and the fitting of the engaging part and the protrusion ensures that the heat shield plate does not come off. It is prevented.

[0008]

【Example】

 FIG. 1 is an exploded perspective view showing a first embodiment of the present invention, and FIG. 2 is a sectional view showing a mounted state. The heat shield plate 2 is composed of components 3 and 4 having an arcuate cross section, and is arranged above and below the exhaust pipe 1 with a gap. Two pierce barrings 10, 10 are formed on the constituent pieces 3, 4 at both ends along the longitudinal direction of the exhaust pipe 1 at a position of 45 ° to the left and right from the arc center. Note that FIG. 1 shows only one end side. Each piercing ring 10 is formed toward the center of the arc, and protrudes toward the exhaust pipe 1.

The component piece is fixed to the exhaust pipe by a ring-shaped C-shaped clamp 5. The clamp is formed of a strip-shaped material and has a fastening portion 12 with a bolt 13 and a nut 14 at its end. A protrusion 16 is formed on the clamp 5 at a position corresponding to each pierce burring 10 of the component pieces 3 and 4, and when it is wound on the outside of the component pieces 3 and 4, as shown in FIG. The projection 16 penetrates the hole 11 of the piercing bar ring 10 and projects toward the center of the component pieces 3 and 4, and the tip of the projection 16 contacts the exhaust pipe 1.

This embodiment is configured as described above, and when attaching the heat shield plate, first, the heat shield plate constituent pieces 3 and 4 are held around the exhaust pipe 1, and the clamp 5 is provided outside the end of the constituent piece. Position it. Then, the ring inner protrusion 16 of the clamp 5 is engaged with the hole 11 of the pierce bar ring of the component piece to hold the heat shield plate component pieces 3 and 4 in the clamp 5, and then the hole 11 of the pierce bar ring 10 is held. Tighten the bolt 13 and the nut 14 of the clamp until the tip of the protrusion 16 that penetrates through the abutment contacts the exhaust pipe 1.

As described above, the clamp 5 is directly fastened and fixed to the exhaust pipe 1, and the component pieces 3 and 4 of the heat shield plate 2 are held by the clamp 5. The component pieces 3 and 4 are securely held by the clamp 5 without coming off from the protrusions 16 because the holes 11 of the plurality of pear burrings engage with the protrusions 16 protruding in different directions.

As described above, in this embodiment, the clamp directly contacts the exhaust pipe and also functions as a support that forms a gap between the heat shield plate and the exhaust pipe, and the heat shield plate protrudes. Since it is held only by the clamp due to the engagement of the holes with the holes, the number of parts is small and the plate thickness of the heat shield plate component can be made thin. In this case, there is no risk of cracks in the heat shield plate. . Moreover, since the holes of the heat shield plate are formed as pierce burring, there is no backlash due to vibration.

FIG. 3 shows a second embodiment of the device. Here, instead of the holes 21 in the heat shield plate component of the previous embodiment, a recess is provided in the component. That is, the component pieces 3 ', 4'having an arcuate cross-section of the heat shield plate 2'are provided with two recesses at positions 45 ° to the left and right from the arc center at both ends along the longitudinal direction of the exhaust pipe 1. 20, 20 are formed. Each recess 20 is formed in the direction of the center of the arc, and the bottom of the recess projects toward the exhaust pipe 1. The clamp 5'is formed with a protrusion 16 'at a position corresponding to each recess 20 of the component pieces 3', 4 '. When the protrusion 5'is wound around the component pieces 3', 4 ', the protrusion 16' is formed. 'Is fitted in the recess 20 so that the bottom of the recess abuts the exhaust pipe 1. The other structure is similar to that of the first embodiment.

This embodiment is configured as described above, and when attaching the heat shield plate, first, the heat shield plate constituent piece is held around the exhaust pipe, and the clamp is positioned outside the end of the constituent piece. Then, the recess 20 of the component piece is fitted into the ring inner protrusion 16 ′ of the clamp, and the heat shield plate component pieces 3 ′ and 4 ′ are held in the clamp 5 ′, and then the bottom portion of the recess portion 20 becomes the exhaust pipe 1. Tighten the bolts and nuts of the clamp 5'until they abut.

As described above, the clamp tightens the component piece of the heat shield plate from the outside and presses the bottom of the recess to the exhaust pipe to fix it. Since the bottoms of the recesses are engaged with the projections and the bottoms of the recesses are sandwiched and fixed between the projections and the exhaust pipe, the component piece is securely held in the clamp without coming off. There is no play.

In this embodiment, the heat shield plate component pieces 3 ′ and 4 ′ serve as a support for forming a gap between the heat shield plate and the exhaust pipe, and like the previous embodiment, Since the number of points is small and the component piece is pressed against the exhaust pipe by the projection at the bottom of the recess, the possibility of sliding with the exhaust pipe is small, and even if the thickness of the heat shield plate component is reduced There is no risk of cracks in the hot plate. Even if a slide occurs and a crack should occur, it will not fall off because the protrusion of the clamp fits into the recess of the component piece.

In each of the above-mentioned embodiments, the heat shield plate is shown to be composed of two divided component pieces, but it is not limited to two and may be divided into a larger number of component pieces, or It may be composed of one component piece. Further, the numbers and positions of the projections formed on the clamp and the holes and recesses as the engaging portions formed on the heat shield plate are not limited to those in the embodiment, and are arbitrary.

[0018]

[Effect of device]

 As described above, according to the present invention, the clamp is provided with a plurality of protrusions, the heat shield plate is provided with a plurality of engaging portions, and the protrusions are fitted to the engaging portions, and either the protrusions or the engaging portions are attached. Since the exhaust pipe is brought into contact with the exhaust pipe, a gap between the heat shield plate and the exhaust pipe is formed by the projection or the engaging portion brought into contact with the exhaust pipe, and a separate component for maintaining the gap is not required. Further, since either the protrusion of the clamp or the heat shield plate engaging portion in which the protrusion is fitted comes into contact with the exhaust pipe by clamping the clamp, there is no or no mutual slide between the exhaust pipe and the heat shield. Therefore, even if the heat shield plate is a thin plate, there is an effect that cracks do not occur and there is no fear of falling off. As a result, cost reduction and weight reduction can be achieved, and fuel consumption can be improved.

[Brief description of drawings]

 ]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a mounting state of the embodiment.

FIG. 3 is a sectional view showing a second embodiment.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 1 Exhaust pipe 2, 2'Heat shield 3, 3'4, 4'Component piece 5, 5'Clamp 10 Pierce burring 11 Hole 12 Tightening part 13 Bolt 14 Nut 16, 16 'Protrusion 20 Recessed portion 32 Heat shield 33, 34 Component Piece 35 Clamp 37 Support Section

Claims (3)

[Scope of utility model registration request] 1. A heat shield plate mounting structure for an exhaust pipe, wherein a heat shield plate provided outside the exhaust pipe with a gap therebetween is clamped and fixed by a clamp, wherein the clamp protrudes toward the exhaust pipe side. When a plurality of protrusions are formed and a plurality of engaging portions corresponding to the protrusions are formed on the heat shield plate, the protrusions are fitted to the engaging portions of the heat shield plate and the clamp is tightened. The heat shield plate mounting structure for an exhaust pipe, wherein any one of the protrusion and the engaging portion is configured to contact the exhaust pipe to form the gap. 2. The exhaust pipe according to claim 1, wherein the engaging portion is a hole through which the protrusion penetrates, and a tip of the protrusion penetrating the hole abuts on the exhaust pipe. Heat shield plate mounting structure. 3. The engaging portion is a concave portion having a bottom portion protruding toward the exhaust pipe and into which the protrusion fits, and the bottom portion of the concave portion is pressed against the protrusion and abuts on the exhaust pipe. The heat shield plate mounting structure for an exhaust pipe according to claim 1, wherein: