JP5922620B2 - Anti-vibration mounting structure for heat shield cover to exhaust system parts - Google Patents

Description

  The present invention relates to an improvement in a vibration-proof attachment structure of a heat shield cover to an exhaust system component, in which the heat shield cover covering the exhaust system component of an internal combustion engine is connected via a buffer member.

  Such an anti-vibration mounting structure of the heat insulating cover to the exhaust system parts is already known as disclosed in Patent Documents 1 and 2 below.

JP 2000-356138 A JP 2005-30571 A

  In the anti-vibration mounting structure of the heat shield cover to the exhaust system component described in Patent Document 1, an arc shape is formed around the fastening portion of the heat shield cover that is bolted to the exhaust system component, leaving a piece of weak part. A notch is provided to absorb the vibration from the exhaust system parts to the heat shield cover using the elasticity of the fragile part. The plate thickness of the fragile part is the same as that of the heat shield cover itself. In order to give the fragile part a low spring constant necessary for absorbing vibration, the fragile part must be made into one piece and narrow. I must. However, in such a case, one piece of the fragile portion may be damaged by concentrated stress when absorbing vibration, and there is a concern about reliability.

  Further, in the one described in Patent Document 2, the buffer member is a collar member fastened to the exhaust system part, a fitting member surrounding the collar member and connected to the heat shield cover, the collar member and the fitting Since it is composed of three or more coil springs that connect the members in four directions, vibrations in all directions of the exhaust system parts can be absorbed by the coil springs to suppress transmission to the heat shield cover, The number of parts is large, the structure is complicated, and it is difficult to provide at low cost.

  The present invention has been made in view of such circumstances. The exhaust system part has good vibration absorption of the exhaust system part, has high durability, has a small number of parts, has a simple structure, and is inexpensive. An object of the present invention is to provide an anti-vibration mounting structure for a heat insulating cover.

In order to achieve the above object, the present invention provides an anti-vibration mounting structure for a heat shield cover to an exhaust system component, wherein the heat shield cover covering the exhaust system component is connected to the exhaust system component via a buffer member. The buffer member is made of a metal plate having a thickness smaller than that of the heat shield cover, and a central connecting portion fastened to the exhaust system parts, and surrounds the central connecting portion, and has a shaft with respect to the central connecting portion. An outer peripheral connection part that is offset in the direction and connected to the heat shield cover, and the central connection part and the outer peripheral connection part are integrally connected to each other, and the wharf that absorbs vibration between the central connection part and the outer peripheral connection part constituted by a conical elastic deflection portion, the frusto conical elastic deflection unit, Rutotomoni a plurality of lightening holes arranged in a circumferential direction, wherein the heat shielding cover and the outer periphery through the lightening holes this was to include a connection member that sandwich the connecting portion The the first feature.

In addition to the first feature of the present invention, the connecting member extends from an inner peripheral edge of the annular plate portion and an annular plate portion that is superimposed on one side surface of the heat shield cover and the outer peripheral connecting portion. A second feature is that it is constituted by a plurality of bent pieces that sandwich the heat shield cover and the outer peripheral coupling portion in cooperation with the annular plate portion through the lightening hole.

Furthermore, the present invention provides an anti-vibration mounting structure for a heat shield cover to an exhaust system component, wherein the heat shield cover for covering the exhaust system component is connected to the exhaust system component via a buffer member. The metal plate is thinner than the heat cover, surrounds the central coupling part fastened to the exhaust system parts, surrounds the central coupling part, and is offset in the axial direction with respect to the central coupling part. The outer peripheral connecting part connected to the heat shield cover, and the central connecting part and the outer peripheral connecting part are integrally connected, and the frustoconical bending elastic part that absorbs vibration between the central connecting part and the outer peripheral connecting part. A plurality of lightening holes arranged in the circumferential direction in the frustoconical bending elastic part, and the outer peripheral connection part is sandwiched in cooperation with the heat shield cover through the lightening hole. A plurality of bent pieces to be integrated with the heat shield cover. A third feature in that the.

Furthermore, the present invention provides an anti-vibration mounting structure for a heat shield cover to an exhaust system component, wherein the heat shield cover for covering the exhaust system component is connected to the exhaust system component via a buffer member. The metal plate is thinner than the heat cover, surrounds the central coupling part fastened to the exhaust system parts, surrounds the central coupling part, and is offset in the axial direction with respect to the central coupling part. The outer peripheral connecting part connected to the heat shield cover, and the central connecting part and the outer peripheral connecting part are integrally connected, and the frustoconical bending elastic part that absorbs vibration between the central connecting part and the outer peripheral connecting part. A plurality of connecting holes arranged in the heat shield cover in the circumferential direction of the buffer member, and a plurality of bent pieces that sandwich the heat shield cover through the connection holes in cooperation with the outer periphery connecting portion. Connected integrally to the outer periphery of the outer peripheral connecting portion. That was the fourth feature.

Furthermore, the present invention is characterized in that, in addition to the fourth feature, a plurality of lightening holes arranged in the circumferential direction are provided in the frustoconical bending elastic portion.

Furthermore, according to the seventh aspect of the present invention, in addition to any one of the first to third and fifth features, the outer peripheral connecting portion is provided with a plurality of second lightening holes arranged in the circumferential direction. Features.

Furthermore, in addition to any one of the first to third, fifth, and sixth features, the present invention further includes a heat shield piece that faces the lightening hole on one of the central connecting portion and the outer peripheral connecting portion. This is the eighth feature.

  According to the first feature of the present invention, the buffer member is made of a metal plate having a thickness smaller than that of the heat shield cover, and surrounds the central coupling portion fastened to the exhaust system component and the central coupling portion. In addition, an outer peripheral connecting portion that is offset in the axial direction with respect to the central connecting portion and connected to the heat shield cover, and the central connecting portion and the outer peripheral connecting portion are integrally connected, and the central connecting portion and the outer peripheral connecting portion are connected. Because it is composed of a frustoconical bending elastic part that absorbs vibration between parts, the bending elastic part can easily bend in all directions, so it absorbs vibrations in all directions transmitted from exhaust system parts well. Thus, it is possible to effectively suppress the transmission of vibrations to the outer peripheral connecting portion and the heat shield cover connected thereto, thereby preventing the generation of vibration noise. In addition, since the stress generated during vibration absorption of the flexible elastic portion is dispersed throughout the frustoconical shape, the generation of concentrated stress can be avoided and the durability of the flexible elastic portion can be enhanced. In addition, since the shock-absorbing member is a single item and the structure is simple, it is possible to provide an anti-vibration mounting structure for the heat-insulating cover at a low cost.

In addition , since a plurality of hollow holes arranged in the circumferential direction are provided in the frustoconical bending elastic part, the spring constant of the bending elastic part can be set as desired without restricting the vibration absorption direction of the bending elastic part. It can be set low.

Furthermore , since the connecting member that clamps the heat shield cover and the outer peripheral connection portion through the lightening hole is provided, the connection between the heat shield cover and the outer peripheral connection portion can be easily performed.

According to the second feature of the present invention, since the buffer member and the heat shield cover using a single connecting member are connected, the connecting structure is simple.

According to the third feature of the present invention, since the plurality of bent pieces that sandwich the outer peripheral connecting portion through the lightening hole and cooperate with the heat insulating cover are integrally connected to the heat insulating cover, the special connecting member is provided. The buffer member and the heat shield cover can be connected without using the heat shield cover, which can contribute to the cost reduction of the anti-vibration mounting structure of the heat shield cover.

According to the fourth and fifth features of the present invention, the heat insulating cover is provided with a plurality of connecting holes arranged in the circumferential direction of the buffer member, and the heat insulating cover is sandwiched in cooperation with the outer peripheral connecting portion through these connecting holes. Since a plurality of bent pieces are integrally connected to the outer periphery of the outer peripheral connecting portion, the buffer member and the heat insulating cover can be connected without using a special connecting member. This can contribute to the cost reduction of the anti-vibration mounting structure.

According to the sixth aspect of the present invention, since the outer peripheral connecting portion is provided with the plurality of second lightening holes arranged in the circumferential direction, the outer peripheral connecting portion becomes an elastic portion partially connected to the flexible elastic portion. The spring constant of the flexible elastic part can be further reduced, and the vibration absorption of the flexible elastic part can be increased.

According to the seventh feature of the present invention , since the heat shielding piece facing the lightening hole is connected to one of the central connecting part and the outer peripheral connecting part, the radiant heat radiated from the exhaust system component side is absorbed by the lightening hole. Can be prevented as much as possible by the heat shield.

1 is a side view of an exhaust purification catalytic converter with a heat shield cover showing a first embodiment of the present invention. FIG. 2-2 line expanded sectional view of FIG. 1 (2-2 sectional view taken on the line of FIG. 3). FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. The perspective view of the buffer member in FIG.2 and FIG.3. The perspective view of the connection member in FIG.2 and FIG.3. FIG. 6 is a view corresponding to FIG. 2 showing a second embodiment of the present invention (cross-sectional view taken along line 6-6 in FIG. 7). FIG. 7 is a view taken in the direction of arrow 7 in FIG. 6. FIG. 9 is a view corresponding to FIG. 2 showing a third embodiment of the present invention (cross-sectional view taken along line 8-8 in FIG. 9). FIG. 9 is a view taken in the direction of arrow 9 in FIG. 8.

  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 of the present invention shown in FIGS. In FIG. 1, reference symbol C denotes 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, An inlet flange 1 to which the exhaust manifold of the engine is joined is formed, and an outlet flange 2 to which an exhaust pipe is connected is formed at the lower downstream end. Thus, the catalytic converter C is a component of the exhaust system of the internal combustion engine. The catalytic converter C includes an adjacent member of the catalytic converter C between the inlet flange 1 and the outlet flange 2, such as the dashboard. A heat insulating cover 3 made of an Al alloy is attached to cover the side surface facing the surface.

  As shown in FIGS. 1 and 2, the cover stays 4 are fixed to a plurality of locations on the outer surface of the catalytic converter C by welding or the like, and the heat shield cover 3 is attached to these cover stays 4 via buffer members 7.

  Each cover stay 4 includes a through hole 5 and a welding nut 6 disposed on the lower surface thereof.

  As shown in FIGS. 2 to 4, each buffer member 7 is made of a steel plate having a thickness smaller than that of the heat shield cover 3, and has a circular central coupling portion 10 having a mounting hole 8 in the center portion. Surrounding the central connecting portion 10, an annular outer peripheral connecting portion 11 that is offset in the axial direction with respect to the central connecting portion 10, and the central connecting portion 10 and the outer peripheral connecting portion 11 are integrally connected to each other. It is composed of a frusto-conical bending elastic portion 12 that absorbs vibration between the connecting portion 10 and the outer peripheral connecting portion 11, and the bending elastic portion 12 includes a plurality of, preferably three or more, arranged in the circumferential direction. The first cutout hole 14 is formed, and the outer peripheral connecting portion 11 is formed with a plurality of second cutout holes 15 arranged in the circumferential direction.

  The heat shield cover 3 is placed on the upper surface of the outer peripheral connecting portion 11. The heat shield cover 3 is formed with a circular through hole 17 corresponding to the inner peripheral edge of the outer peripheral connecting portion 11, and the through hole 17 and the first cutout hole 14 are used by the connecting member 18. The heat shield cover 3 and the outer periphery connecting portion 11 are connected.

  As shown in FIGS. 2, 3 and 5, the connecting member 18 includes an annular plate portion 19 and a plurality of first bent pieces 20 extending from the inner peripheral edge of the annular plate portion 19. The annular plate portion 19 is overlaid on the upper surface of the heat shield cover 3, and the plurality of first bent pieces 20 are passed through the through holes 17 of the heat shield cover 3 and the first cutout holes 14 of the flexible elastic portion 12. Later, it is bent radially outward. As a result, the plurality of first bent pieces 20 are connected by sandwiching the heat shield cover 3 and the outer peripheral connecting portion 11 in cooperation with the annular plate portion 19.

  The central connecting portion 10 of the buffer member 7 connected to the heat shield cover 3 is placed on the cover stay 4, and the bolt 20 is welded nut through the mounting hole 8 of the central connecting portion 10 and the through hole 5 of the cover stay 4. 6, and the central connecting portion 10 is fastened to the cover stay 4.

  It is desirable to form a plating layer on the surfaces of the buffer member 7 and the connecting member 18 that can prevent electrolytic corrosion.

  Next, the operation of this embodiment will be described.

  The catalytic converter C of the exhaust system of the internal combustion engine purifies the exhaust gas during operation of the internal combustion engine and becomes high temperature due to the purification reaction heat. However, since the heat shield cover 3 covers the side surface of the catalytic converter C, The heat cover 3 can block the radiant heat of the catalytic converter C and prevent thermal damage to various devices adjacent to the catalytic converter C.

  Further, the catalytic converter C vibrates due to exhaust pulsation or the like generated therein, and the vibration is transmitted from the cover stay 4 to the central coupling portion 10 of the buffer member 7 and further to the flexible elastic portion 12.

  By the way, the flexible elastic portion 12 of the buffer member 7 is thinner than the heat shield cover 3 and has a truncated conical shape, and can be easily bent in all directions. Therefore, any direction transmitted from the catalytic converter C side is possible. Can be effectively absorbed to effectively suppress transmission of vibration to the outer peripheral connecting portion 11 and the heat shield cover 3 connected thereto, thereby preventing generation of vibration noise.

  In particular, the frustoconical bending elastic portion 12 is provided with a plurality of first cutout holes 14 arranged in the circumferential direction thereof, so that the bending elastic portion 12 is not restricted in the vibration absorption direction of the bending elastic portion 12. It is possible to set the spring constant of 12 as low as desired. As a result, the flexible elastic portion 12 absorbs even vibrations with large amplitude of the catalytic converter C during low-speed operation of the engine, thereby suppressing vibration of the heat shield cover 3 and maintaining the quietness of the engine. To contribute. If the number of the first cutout holes 14 of the flexible elastic portion 12 is three or more arranged in the circumferential direction, the restriction of the vibration absorption direction of the flexible elastic portion 12 can be eliminated more effectively.

  Further, since the outer peripheral connecting portion 11 connected to the heat shield cover 3 by the plurality of first bent pieces 20 of the connecting member 18 is provided with a plurality of second hollow holes 15 arranged in the circumferential direction, the outer peripheral connecting portion 11 Becomes an elastic part partially connected to the flexible elastic part 12, and can further reduce the spring constant of the flexible elastic part 12 and increase its vibration absorption.

  Moreover, since the generated stress is dispersed throughout the frustoconical shape during vibration absorption of the flexible elastic portion 12, it is possible to avoid the occurrence of concentrated stress and improve the durability of the flexible elastic portion 12. In addition, since the buffer member 7 is a single product, the structure is simple, and the connection structure between the buffer member 7 and the heat shield cover 3 using a single connecting member 18 is also simple. The anti-vibration mounting structure for the cover 3 can be provided at low cost.

  Next, a second embodiment of the present invention shown in FIGS. 6 and 7 will be described.

  In the second embodiment, a plurality of bent pieces 23 erected from the inner peripheral edge of the through hole 17 are integrally formed on the heat shield cover 3, and these bent pieces 23 form the first cutout holes 14 of the buffer member 7. After passing, it is bent outward in the radial direction, and the outer peripheral connecting portion 11 of the buffer member 7 is sandwiched between the bent piece 23 and the heat shield cover 3. Since the other configuration is the same as that of the first embodiment, in FIG. 6 and FIG. 7, portions corresponding to those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  According to the second embodiment, the buffer member 7 and the heat insulating cover 3 can be connected without using a special connecting member, and the vibration-proof mounting structure of the heat insulating cover 3 can be provided at a lower cost. can do.

  Finally, a third embodiment of the present invention shown in FIGS. 8 and 9 will be described.

  In the third embodiment, the heat insulating cover 3 is provided with a plurality of connecting holes 25 surrounding the through hole 17. Further, a plurality of bent pieces 26 standing up from there are integrally connected to the outer peripheral edge of the outer peripheral connecting portion 11 of the buffer member 7, and after these bent pieces 26 pass through the connecting hole 25, they are radially inward. The heat insulating cover is sandwiched between the bent piece 26 and the outer peripheral connecting portion 11. Further, a heat shielding piece 27 facing the first lightening hole 14 is projected from either one of the central connecting portion 10 and the outer peripheral connecting portion 11.

  Since the other configuration is the same as that of the first embodiment, in FIG. 8 and FIG. 9, parts corresponding to those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  Also according to the third embodiment, the shock-absorbing member 7 and the heat insulating cover 3 can be connected without using a special connecting member, and the anti-vibration mounting structure for the heat insulating cover 3 can be provided at a lower cost. be able to. Further, since the heat shielding piece 27 faces the first lightening hole 14, it is possible to prevent the radiant heat radiated from the catalytic converter C side from passing through the first lightening hole 14 as much as possible.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. 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 adjacent members.

C ... Exhaust system parts (catalytic converter)
3... Heat insulation cover 7... Buffer member 10... Central connection portion 11. Hole)
15 ... 2nd lightening hole (2nd lightening hole)
18... Connecting member 19... Annular plate portion 20 .. bent piece 23 .. bent piece 25... Connecting hole 26. ... Heat shield

Claims (7)

In the anti-vibration mounting structure of the heat shield cover to the exhaust system component, in which the heat shield cover (3) covering the exhaust system component (C) is connected via the buffer member (7),
The buffer member (7) is made of a metal plate having a thickness smaller than that of the heat shield cover (3), and a central connecting portion (10) fastened to the exhaust system component (C), and the central connecting portion The outer peripheral connection part (11) which surrounds (10) and is offset in the axial direction with respect to the central connection part (10) and connected to the heat shield cover (3), and the central connection part (10) And the outer peripheral connection part (11) are integrally connected to each other, and the central connection part (10) and the outer peripheral connection part (11) are constituted by a frustoconical bending elastic part (12) that absorbs vibration. ,
The frustoconical flexible elastic portion (12) is provided with a plurality of lightening holes (14) arranged in the circumferential direction thereof, and the heat shield cover (3) and the outer periphery through the lightening holes (14). An anti-vibration mounting structure for a heat-insulating cover to an exhaust system component, characterized in that it comprises a connecting member (18) for holding the connecting portion (11) . The anti-vibration mounting structure of the heat shield cover to the exhaust system component according to claim 1 ,
The connecting member (18) extends from the heat shield cover (3) and an outer peripheral edge of the outer peripheral connecting portion (11) and an annular plate portion (19) extending from the inner peripheral edge of the annular plate portion (19). A plurality of bent pieces (20) that sandwich the heat shield cover (3) and the outer peripheral connection part (11) in cooperation with the annular plate part (19) through the lightening hole (14). Anti-vibration mounting structure for heat insulation cover to exhaust system parts. In the anti-vibration mounting structure of the heat shield cover to the exhaust system component, in which the heat shield cover (3) covering the exhaust system component (C) is connected via the buffer member (7),
The buffer member (7) is made of a metal plate having a thickness smaller than that of the heat shield cover (3), and a central connecting portion (10) fastened to the exhaust system component (C), and the central connecting portion The outer peripheral connection part (11) which surrounds (10) and is offset in the axial direction with respect to the central connection part (10) and connected to the heat shield cover (3), and the central connection part (10) And the outer peripheral connection part (11) are integrally connected to each other, and the central connection part (10) and the outer peripheral connection part (11) are constituted by a frustoconical bending elastic part (12) that absorbs vibration. ,
A plurality of lightening holes (14) arranged in the circumferential direction are provided in the frustoconical bending elastic part (12),
A plurality of bent pieces (2 3 ) that sandwich the outer peripheral connecting portion (11) in cooperation with the heat shield cover (3) through the lightening hole (14) are integrated with the heat shield cover (3). Anti-vibration mounting structure for heat-insulating covers to exhaust system parts, characterized by the continuous installation. In the anti-vibration mounting structure of the heat shield cover to the exhaust system component, in which the heat shield cover (3) covering the exhaust system component (C) is connected via the buffer member (7),
The buffer member (7) is made of a metal plate having a thickness smaller than that of the heat shield cover (3), and a central connecting portion (10) fastened to the exhaust system component (C), and the central connecting portion The outer peripheral connection part (11) which surrounds (10) and is offset in the axial direction with respect to the central connection part (10) and connected to the heat shield cover (3), and the central connection part (10) And the outer peripheral connection part (11) are integrally connected to each other, and the central connection part (10) and the outer peripheral connection part (11) are constituted by a frustoconical bending elastic part (12) that absorbs vibration. ,
The heat shield cover (3) is provided with a plurality of connecting holes (25) arranged in the circumferential direction of the buffer member (7), and passes through the connecting holes (25) to cooperate with the outer peripheral connecting part (11). A plurality of bent pieces (26) sandwiching the heat insulating cover (3) are integrally connected to the outer periphery of the outer peripheral connecting portion (11), and the vibration insulating attachment of the heat insulating cover to the exhaust system parts is provided. Construction. In the vibration-proof attachment structure of the heat shield cover to the exhaust system component according to claim 4,
An anti-vibration mounting structure for a heat insulating cover to an exhaust system component, wherein the frustoconical bending elastic portion (12) is provided with a plurality of lightening holes (14) arranged in the circumferential direction. In the anti-vibration mounting structure of the heat insulating cover to the exhaust system component according to any one of claims 1 to 3 ,
An anti-vibration mounting structure for a heat insulating cover to an exhaust system component, wherein the outer peripheral coupling portion (11) is provided with a plurality of second lightening holes (15) arranged in the circumferential direction. In the anti-vibration mounting structure of the heat shield cover to the exhaust system component according to any one of claims 1 to 3, 5 , and 6,
A heat shield for an exhaust system component, characterized in that a heat shield piece (27) facing the lightening hole (14) is connected to one of the central connecting portion (10) and the outer peripheral connecting portion (11). Anti-vibration mounting structure for the cover.

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