JP5703193B2 - Heat shield cover mounting structure for exhaust system parts - Google Patents

Description

  The present invention relates to a structure in which a heat insulating cover that covers an exhaust system part is attached to the exhaust system part in order to prevent heat damage of the exhaust system part that becomes a high temperature of the internal combustion engine. A mounting hole provided in the heat shield covering the exhaust system parts, a collar penetrating through the mounting hole in a non-contact state, a pair of collars formed at both ends of the collar, and the pair of collars An exhaust system component comprising a heat-resistant cushion ring interposed between at least one and the heat shield cover and fitted to the outer peripheral surface of the collar, and a fixing member for fixing the collar to the cover mounting portion The present invention relates to improvement of a heat shield cover mounting structure.

  Such a heat shield cover mounting structure for exhaust system parts is already known as disclosed in Patent Document 1 below.

JP 2000-329192 A

  In the heat shield cover mounting structure to such exhaust system parts, the outer peripheral surface of the cushion ring is formed with a step consisting of a large diameter portion and a small diameter portion, and a mounting hole for the heat shield cover is fitted to the small diameter portion. This restricts the relative movement of the heat shield cover and cushion ring, avoids contact between the heat shield cover and the collar, absorbs vibration of the heat shield cover by the elasticity of the cushion ring, and prevents the generation of vibration noise I am doing so.

  However, since the stepped cushion ring as described above is more expensive than the flat cushion ring, it is difficult to reduce the cost of the entire mounting structure due to its influence. Also, in the structure using a stepped cushion ring, it is necessary to specify the direction of the cushion ring because it is necessary to fit the mounting hole of the heat shield cover to the small diameter part at the time of assembly, so be careful of misassembly. Therefore, it cannot be said that the assemblability is good.

  The present invention has been made in view of such circumstances, and it is possible to regulate the relative movement of the heat shield cover and the cushion ring while using an inexpensive flat cushion ring, and to contact the heat shield cover and the collar. It is an object of the present invention to provide a structure for attaching a heat shield cover to the exhaust system part, which can absorb vibration of the heat shield cover by the elasticity of the cushion ring and prevent generation of vibration noise. And

In order to achieve the above object, the present invention provides a cover mounting portion provided in an exhaust system component, a mounting hole provided in a heat shield covering the exhaust system component, and a collar that penetrates the mounting hole in a non-contact state. And a pair of collars formed at both ends of the collar, a heat-resistant cushion that is interposed between at least one of the pair of collars and the heat shield cover and fits to the outer peripheral surface of the collar In a heat shield cover mounting structure for exhaust system parts, comprising a ring and a fixing member for fixing the collar to the cover mounting portion, the cushion ring is formed in a flat plate shape, while the attachment to the heat shield cover the relative movement of the cushion ring and heat shield cover bite into the end surface of the cushion ring with bent from the peripheral edge of the hole to protrude on one side surface of the heat shielding cover That it has an annular locking projection for restricting the first feature.

  The exhaust system component is a catalytic converter C in an embodiment of the present invention to be described later, the cover attaching portion corresponds to the cover stay 4 in the embodiment, and the pair of flange portions are This corresponds to the flange 15 and the flange plate 18 in the same embodiment.

  In addition to the first feature, the present invention includes the same pair of cushion rings formed in a flat plate shape between each of the pair of flanges and the heat shield cover, and one of the cushion rings. The second feature is that the locking projections are bitten into the first.

  Furthermore, in addition to the first or second feature, the present invention further includes forming a flange as one of the flanges at one end of the collar penetrating the mounting hole, and inserting the cushion ring into the collar. After that, the other end of the collar is joined with the other annular flange plate as the flange portion, and the cushion ring is compressed while the cushion protrusion is bitten while compressing the cushion ring. A third feature is that a three-dimensional structure is formed.

Furthermore, according to the present invention, in addition to any one of the first to third features, the annular locking protrusion is formed by burring performed after piercing of the mounting hole or simultaneously with the processing. The fourth feature.

According to the first feature of the present invention, the heat shield cover is bent from the peripheral edge of the mounting hole and protrudes to one side surface of the heat shield cover, and bites into the end face of the cushion ring so that the cushion ring and the heat shield cover are Since the annular locking projection that restricts movement is formed, the relative movement between the mounting hole of the heat shield cover and the cushion ring is restricted by this locking projection even during vibration, and the inner peripheral surface of the mounting hole Contact with the collar can be prevented, and therefore heat conduction and vibration transfer due to the contact can be avoided. In addition, since the inexpensive cushion ring is sufficient, the cost of the heat shield cover mounting structure can be reduced. In addition, the locking protrusions can bite into either end face of the cushion ring, so there is no need to consider the orientation of the cushion ring during assembly, eliminating the risk of misassembly and contributing to improved assembly. obtain.

  According to the second feature of the present invention, the same pair of cushion rings formed in a flat plate shape is interposed between each of the pair of collars and the heat shield cover, and the above-mentioned engagement with the one cushion ring is provided. Since the protrusions are bitten, the heat shield cover is elastically supported by the pair of cushion rings while the locking protrusion is biting into one of the cushion rings, and heat conduction from the exhaust system parts to the heat shield cover In addition, vibration transmission can be effectively prevented.

Moreover as a pair of the cushion ring, so that the same in a flat plate shape is used, an inexpensive both cushion rings both with Ru can reduce the cost of the heat insulating cover mounting structure, the same pair of cushion ring Since they have compatibility, there is no need to worry about misassembly, which can contribute to the improvement of assembly.

  According to the third aspect of the present invention, the heat shield cover can be configured with the cushion ring assembly before being attached to the exhaust system component, so that the collar of the assembly is attached to the exhaust system component by the fixing member. By fixing to the cover attaching portion, the heat shield cover can be easily and quickly attached to the exhaust system parts, and the efficiency of the heat shield cover attaching operation can be improved.

According to the fourth aspect of the present invention, the annular locking projection can be formed by burring performed after piercing of the mounting hole or simultaneously with the processing.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of this invention is shown, The side view of the catalytic converter for exhaust purification which attached the heat shield cover. FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 1. The perspective view which shows embodiment and the reference form of the latching protrusion formed in the said heat-insulation cover. FIG. 4 is a view corresponding to FIG. 2 showing a second embodiment of the present invention. FIG. 4 is a view corresponding to FIG. 2 showing a third embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 5 showing a fourth embodiment of the present invention. FIG. 9 is a view corresponding to FIG. 2 showing a fifth embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the description starts with the description of the first embodiment and the reference embodiment of the present invention shown in FIGS. In FIG. 1, symbol C is a catalytic converter for purifying exhaust gas of an internal combustion engine for automobiles, which is disposed between the internal combustion engine and the dashboard of the vehicle body with the longitudinal direction oriented vertically, and at the upstream end above it. An inlet flange 1 to which the downstream end of the exhaust manifold of the internal combustion engine is joined is formed, and an outlet flange 2 to which the exhaust pipe is connected is formed at the lower downstream end. Therefore, the catalytic converter C is a component of the exhaust system of the internal combustion engine. The catalytic converter C faces the adjacent member of the catalytic converter C, for example, the dashboard, between the inlet flange 1 and the outlet flange 2. The heat shield cover 3 that covers the side surface to be attached is attached as follows.

  As shown in FIGS. 1 and 2, cover stays 4 are fixed to a plurality of locations on the outer surface of the catalytic converter C by welding or the like. Each cover stay 4 has a through hole 5 and a welding nut 6 disposed on the lower surface thereof. And.

  On the other hand, the heat shield cover 3 is provided with a cushion ring assembly 10 at a location corresponding to the through hole 5 of the cover stay 4. The cushion ring assembly 10 includes a collar 12 that penetrates the mounting hole 11 provided in the heat shield cover 3 in a non-contact state, that is, with a gap between the inner peripheral surface of the mounting hole 11 and the collar 12. 12 and a pair of heat-resistant cushion rings 13 and 13 which are fitted to the outer peripheral surface of the heat shield cover and face the upper and lower surfaces of the heat shield cover 3.

  The pair of cushion rings 13 and 13 are the same component formed into a flat plate shape with a heat-resistant and elastic material such as steel wool.

The heat shield 3, one side surface of the heat shield 3 extending perpendicularly from the inner peripheral edge of the mounting hole 11, the upper surface of the heat shield 3 in this embodiment protrudes annular may bite above the cushion ring 13 The locking protrusion 14 (see FIG. 3A) is formed integrally. This annular locking projection is formed, for example, by burring performed after piercing of the attachment hole 11 or simultaneously with the processing.

Incidentally, FIG. 3 (B) shows a plurality of locking projections 14, 14 and the reference embodiment which is arranged annularly along an inner peripheral edge of the attachment hole 11 of the locking projection 14.

  The collar 12 is integrally formed with a flange 15 for supporting the lower cushion ring 13 at one end, and a short shaft 17 having a small diameter is formed at the other end via an annular step 16. An annular flange plate 18 is fitted to the flange portion 18, and the flange plate 18 is sandwiched and fixed between a caulking portion 17 a formed at the tip of the short shaft 17 and the annular step portion 16. At that time, the pair of cushion rings 13, 13 facing each other with the heat shield cover 3 interposed therebetween is pressed by the flange 15 and the flange plate 18, and the locking projection 14 bites into the upper cushion ring 13. Thus, the cushion ring assembly 10 is configured.

  The cushion ring assembly 10 is overlapped on the upper surface of the cover stay 4 with the flange 15 facing downward, and a fastening bolt 19 inserted into the hollow portion of the collar 12 is screwed and tightened to the welding nut 6. Thus, the heat shield cover 3 is attached to the catalytic converter C.

  Next, the operation of the first embodiment will be described.

  The exhaust system of the internal combustion engine, particularly the catalytic converter C, which is one part of the exhaust system, purifies the exhaust gas during operation of the internal combustion engine and becomes a high temperature due to the heat of reaction for the purification. Since the side surface facing the adjacent member is covered with a space by the heat insulating cover 3, the heat insulating cover 3 can block the radiant heat of the catalytic converter C and prevent thermal damage to the adjacent member.

  By the way, the heat shield cover 3 is elastically passed through a pair of upper and lower cushion rings 13 and 13 to a collar 12 that passes through the mounting hole 11 in a non-contact state and is fastened to the cover stay 4 of the catalytic converter C. Since it is supported, heat conduction from the catalytic converter C to the heat shield cover 3 is blocked by the pair of cushion rings 13 and 13, and overheating of the heat shield cover 3 due to the heat conduction can be prevented. Further, the relative vibration of the catalytic converter C and the heat shield cover 3 due to the vibration of the internal combustion engine is absorbed by the cushion rings 13, 13, and the generation of vibration noise of the heat shield cover 3 can be prevented.

  In particular, the heat shield cover 3 has an annular locking projection 14 that protrudes from the inner peripheral edge of the mounting hole 11 to the upper surface side, and this bites into the upper cushion ring 13. The protrusion 14 restricts the relative movement between the mounting hole 11 of the heat shield cover 3 and the upper cushion ring 13, and can prevent the inner peripheral surface of the mounting hole 11 from contacting the collar 12. Heat conduction and vibration transmission due to contact can be avoided.

  Further, before attaching the heat shield cover 3 to the catalytic converter C, a pair of cushion rings 13 and 13 that are stacked on both upper and lower surfaces of the heat shield cover 3 and a flange 15 that supports the lower cushion ring 13 are provided at the lower end. Cushion ring assembly comprising a collar 12 having an upper portion and a flange plate 18 that presses against an upper cushion ring 13 to cause the engaging projection 14 of the heat shield cover 3 to bite into the lower surface thereof and is caulked to the upper end of the collar 12 10 is assembled in advance, and the heat shield cover 3 can be easily and quickly attached to the catalytic converter C by fastening the collar 12 of the assembly 10 to the cover stay 4 of the catalytic converter C with the fastening bolt 19. Thus, the efficiency of attaching the heat shield cover 3 can be improved.

  Moreover, since the pair of cushion rings 13 and 13 are flat and the same one is used, an inexpensive cushion ring can be used, and the cost can be reduced. In addition, since the locking protrusions may bite into either end face of the cushion ring 13, it is not necessary to consider the orientation of the cushion ring 13 during assembly, and the same pair of cushion rings 13, 13 Because of the compatibility, it is possible to eliminate the risk of misassembly and contribute to the improvement of assembly.

Furthermore, the annular locking projection 14 can be formed by burring performed after piercing of the mounting hole or simultaneously with the processing.

FIG. 4 shows a second embodiment of the present invention. In this second embodiment, a locking projection 14 that is bent from the inner peripheral edge of the mounting hole 11 and protrudes downward on the lower surface side of the heat shield cover 3 is formed. 4 is different from the previous embodiment only in that this bites into the upper surface of the lower cushion ring 13, and other configurations and operational effects are the same as those of the previous embodiment. The parts corresponding to the same reference numerals are assigned the same reference numerals, and redundant description is omitted.

  FIG. 5 shows a third embodiment of the present invention. In this third embodiment, the upper cushion ring 13 with the engaging protrusion 14 bited in is left, the lower cushion ring 13 is omitted, and the collar 12 is shown. 5 is different from the first embodiment in that the heat shield cover 3 is directly supported by the flange 15, and the other configuration is the same as that of the first embodiment. The same reference numerals are assigned to the parts to be described, and the duplicate description is omitted. According to the third embodiment, there is a possibility that some heat conduction and vibration transmission may occur between the flange 15 of the collar 12 that contacts each other and the heat shield cover 3, but the lower cushion ring 13 is omitted. Cost can be reduced.

  FIG. 6 shows a fourth embodiment of the present invention. In this fourth embodiment, the lower cushion ring 13 with the engaging protrusion 14 bited in is left, the upper cushion ring 13 is omitted, and the flange plate is shown. 18 is different from the third embodiment in that the heat shield cover 3 is directly pressed by 18 and the other configuration is the same as that of the third embodiment. Therefore, in FIG. 6, a portion corresponding to the third embodiment. Are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 7 shows a fifth embodiment of the present invention. In this fifth embodiment, a headed rivet 119 is inserted into the collar 12 of the cushion ring assembly 10 instead of the fastening bolt 19 in the first embodiment. Then, the tip end portion 119a is caulked on the lower surface side of the cover stay 4 and the cushion ring assembly 10 is attached to the cover stay 4. Other configurations are the same as those in the first embodiment, and therefore in FIG. The parts corresponding to those of the first embodiment are denoted by the same reference, and redundant description is omitted.

  The present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the gist thereof. For example, the present invention can be applied when a heat shield cover is attached to an exhaust manifold or an exhaust pipe. The position of the heat shield cover that covers the exhaust system parts can be freely selected according to the type and arrangement of the exhaust system parts and the arrangement of the adjacent members.

C ... Exhaust system parts (catalytic converter)
3 .... Heat shield cover 10 ... Cushion ring assembly 11 ... Mounting hole 12 ... Collar 13 ... Cushion ring 14 ... Stop projection 15 鍔 (flange)
18 ...... Buttocks (flange plate)
19 .. Fixing member (fastening bolt)
119... Fixing member (rivet)

Claims (4)

The cover mounting portion (4) provided in the exhaust system component (C), the mounting hole (11) provided in the heat shield cover (3) covering the exhaust system component (C), and the mounting hole (11) are not contacted. A collar (12) that penetrates in the state of the above, a pair of collars (15, 18) formed at both ends of the collar (12), at least one of the pair of collars (15, 18), and the heat shield A heat-resistant cushion ring (13) interposed between the cover (3) and fitted to the outer peripheral surface of the collar (12), and the collar (12) are fixed to the cover attaching portion (4). In the structure for attaching the heat shield cover to the exhaust system parts, comprising the fixing members (19, 119),
While the cushion ring (13) is formed in a flat plate shape, the heat shield cover (3) is bent from the periphery of the mounting hole (11) and protrudes to one side of the heat shield cover (3). An exhaust system part characterized by forming an annular locking projection (14) that bites into an end face of the cushion ring (13) and restricts relative movement of the cushion ring (13) and the heat shield cover (3). Heat shield cover mounting structure. In the heat shield cover mounting structure to the exhaust system component according to claim 1,
Between each of the pair of flanges (15, 18) and the heat shield cover (3), the same pair of cushion rings (13, 13) formed in a flat plate shape is interposed, and one of the cushion rings (13) A structure for attaching a heat shielding cover to an exhaust system component, wherein the locking protrusion (14) is bitten into the exhaust system component. In the heat shield cover mounting structure to the exhaust system component according to claim 1 or 2,
One end of the collar (12) penetrating the mounting hole (11) is formed with one flange (15) as the flange, and the cushion ring (13) is fitted into the collar (12). Thereafter, the other end of the collar (12) is joined by caulking and joining the other annular flange plate (18) as the flange portion to the cushion ring (13) while compressing the cushion ring (13). A structure for attaching a heat shield cover to an exhaust system component, wherein a cushion ring assembly (10) is formed by biting the locking protrusion (14). In the heat insulation cover attachment structure to the exhaust system components according to any one of claims 1 to 3,
  The structure of attaching a heat shield cover to an exhaust system component, wherein the annular locking projection (14) is formed by burring after piercing of the mounting hole (11) or simultaneously with the piercing. .

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