JP5363542B2 - Support device for exhaust parts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a variation in vibration isolation performance caused by the heat degradation of mount rubber used for a supporting device for supporting exhaust components to a vehicle by thermally-insulating the mount rubber from high heat with a thermally-insulating cover. <P>SOLUTION: First and second through-holes 1, 2 are formed at the mount rubber R in the longitudinal direction thereof. Furthermore, the rubber-made thermally-insulating cover C covers the mount rubber from one end of the first through-hole 1 side in the longitudinal direction via the first through-hole 1 to immediately before the second through-hole 2. In addition, an upper supporting rod 45 at a vehicle side is inserted into both a cover hole 20 of the thermally-insulating cover C and the first through-hole 1. Moreover, a lower supporting rod 46 at an exhaust component side is inserted into only the second through-hole 2. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to an exhaust part support device that supports exhaust parts such as exhaust pipes and silencers in a vehicle body in an exhaust system of an engine for a vehicle or the like.

  Conventionally, a support device for supporting an exhaust part of an automobile on a vehicle body is disclosed in, for example, Patent Document 1 described later. In this patent document 1, a first through hole (10, 50) and a second through hole (20, 60) are formed in a mount rubber made of EPDM, and a vehicle body is formed in the first through hole (10, 50). The support part on the side is inserted into the second through hole (20, 60), and the vibration part transmitted from the exhaust part side or the vibration transmitted from the vehicle body side due to the operation of the engine of the automobile. It is designed to absorb.

Japanese Patent No. 2585805

  By the way, exhaust parts such as an exhaust pipe and a silencer connected to an automobile engine receive high heat from exhaust gas flowing through the exhaust system, so that the temperature is high. Heat resistance is also required for a support device for an exhaust part.

  In particular, a mount rubber formed of a rubber material such as EPDM is desired to be shielded from such high heat because it may deteriorate due to thermal deterioration when used for a long time in a high heat environment. .

  The present invention has been made in view of such circumstances, and provides a novel exhaust component support device that can use a conventional mount rubber as it is and can shield the mount rubber from high heat with a simple structure. Let it be an issue.

In order to solve the above-mentioned problem, the invention according to claim 1 is a mount rubber having a first through hole and a second through hole in the longitudinal direction, and an upper vehicle body side support portion inserted into the first through hole. And a lower exhaust component side support portion inserted into the second through hole, and an exhaust component support device comprising:
The mount rubber covers from the one end in the longitudinal direction on the first through-hole side to the front through the first through-hole to the second through-hole with a rubber heat insulating cover separate from the mount rubber. The heat shield cover is formed with a cover hole at a position corresponding to the first through hole, the vehicle body side support portion is inserted into both the cover hole and the first through hole, and the exhaust component side support portion. Is characterized by being inserted only into the second through hole.

  In order to solve the above-mentioned problem, the invention according to claim 2 is characterized in that, in the invention according to claim 1, a space is formed between the rubber heat shield cover and the mount rubber.

  In order to solve the above-mentioned problem, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the rubber heat shield cover is formed in a hat shape, and the length of the first through hole side is long. Covers the entire area of the mount rubber from one end in the direction through the first through hole to the front before reaching the second through hole, and the end surface on the opening side is in contact with the exhaust component side support portion It is characterized in that a bypass recess for avoiding the above is formed.

  According to the invention described in each claim, since the upper part of the mount rubber where the surrounding environment becomes higher temperature is shielded from the high temperature by the heat shield cover, the change in the vibration isolation characteristics due to the thermal deterioration of the mount rubber is prevented. it can. The heat insulating cover made of rubber is formed separately from the mount rubber, and does not cover the entire mount rubber, but instead covers the first through hole from one end in the longitudinal direction on the first through hole side. As described above, since it covers up to the second through hole, it can be easily mounted on the mount rubber, and a conventional mount rubber can be used as it is. Furthermore, since the vehicle body side support part is inserted into the heat shield cover and the exhaust part side support part is not inserted into the heat shield cover, vibration from the exhaust part side is not directly transmitted to the heat shield cover, the strength of the heat shield cover, Does not affect durability.

  In particular, according to the second aspect of the present invention, since the space is provided between the heat shield cover and the mount rubber, the contact portion between the heat shield cover and the mount rubber is reduced, and the heat shield cover to the mount rubber is reduced. Heat conduction is reduced. Thereby, the heat insulation effect by a heat insulation cover improves further. Moreover, since there are few contact | adherence parts, a thermal insulation cover does not affect the vibration proof characteristic of a mount rubber.

  In particular, according to the third aspect of the present invention, the heat shield cover is formed in a cap shape, passes through the first through hole from one end in the longitudinal direction on the first through hole side, and passes through the second through hole. Since the entire area of the mount rubber up to the hole is covered, the heat insulation effect from the high heat of the mount rubber can be further enhanced, and the installation of the heat insulation cover to the mount rubber becomes easier. Furthermore, since a bypass recess for avoiding contact with the exhaust component side support portion is formed on the end surface on the opening side of the heat shield cover, vibration from the exhaust component side support portion is more effectively transmitted to the heat shield cover. It can be surely prevented.

The figure which shows the exhaust system of the motor vehicle provided with the support apparatus of the exhaust component of this invention Partial enlarged view along line 2-2 in FIG. Enlarged view along line 3-3 in FIG. Sectional view along line 4-4 in FIG. Enlarged sectional view taken along line 5-5 in FIG. 4 is an enlarged sectional view taken along line 6-6 in FIG. Enlarged sectional view taken along line 7-7 in FIG. Sectional view showing the state before assembly of the mount rubber and heat shield cover

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention shown in the accompanying drawings.

  In the following description, front and rear, left and right, and top and bottom are referred to based on the forward direction of the automobile on which the exhaust system Ex is mounted.

  In FIG. 1, a catalyst CA, a primary silencer M1, and a secondary silencer M2 are connected in order from the upstream side to the downstream side of the exhaust pipe Pe in the exhaust system Ex of the automobile engine E. Exhaust gas discharged from the engine E mounted on the engine passes through the catalyst CA, and after purifying harmful components such as HC, CO, NOx, etc., enters the primary silencer M1, where the exhaust sound is primarily After being silenced, it reaches the secondary silencer M2, where it is secondarily silenced and released to the outside air.

  Next, the configuration of the support device S for the vehicle body B of the primary silencer M1 as an exhaust part will be described in detail with reference to FIGS.

  The primary muffler M1 is supported at a plurality of locations before and after the vehicle body B by the support device S according to the present invention. The support device S includes a vehicle body side support portion 45 fixed to the vehicle body B, and the primary muffler M1. The exhaust component side support portion 46 fixed to the mounting portion and the mount rubber R assembled between the support portions 45 and 46 are configured.

  The mount rubber R is made of EPDM (ethylene propylene rubber) and has an almost elliptical plate shape. The longitudinal direction (longitudinal direction and major axis direction) is the vertical direction of the automobile, and the lateral direction (minor axis direction). ) In the front-rear direction of the automobile, and the thickness direction thereof is arranged in the left-right direction of the automobile.

  A first through hole 1 is formed in the upper center of the vertical direction (longitudinal direction) of the elliptical plate-shaped mount rubber R, and penetrates both surfaces 3 and 4 in the flat thickness direction. A second through hole 2 penetrating both flat surfaces 3 and 4 in the flat thickness direction is formed at the center lower portion in the longitudinal direction). The axis 1L of the first through hole 1 and the second through hole 2 The axes 2L are parallel to each other (see FIGS. 4 and 5) and extend substantially horizontally in the thickness direction of the mount rubber R. A pair of bulging portions 9 and 10 bulging outward are symmetrically formed in the middle portion in the vertical direction of both side surfaces 5 and 6 in the lateral direction (front-rear direction) of the mount rubber R. The bulges 9 and 10 are for forming a space between the heat insulating cover C attached to the mount rubber R, as will be described later.

  The upper and lower surfaces 7 and 8 of the mount rubber R are formed as circular arc surfaces along the circumferential direction of the first and second through holes 1 and 2, and an H-shaped through hole 11 is formed in the center. It is formed in the thickness direction.

  The heat insulating cover C is formed of EPDM (ethylene propylene rubber) like the mount rubber R, and is configured in a hat shape so that it can be mounted on the mount rubber R from above. The cross-sectional shape of the heat shield cover C in the longitudinal direction (vertical direction) is an inverted U-shape, and the transverse cross section is formed in a rectangular shape that is long in the lateral direction (front-rear direction), and is longer than the mount rubber R (vertical direction). Specifically, as shown in FIGS. 4 and 5, from the one end (upper end) in the longitudinal direction (vertical direction) of the mount rubber R on the first through hole 1 side, It has a length in the longitudinal direction (vertical direction) that can cover up to the second through hole 2 through one through hole 1, and both sides of the heat shield cover C (thickness of the mount rubber R) Cover holes 20 are formed at positions corresponding to the first through-holes 1 of the mount rubber R, and the centers 20c of these cover holes 20 are When the heat shield cover C is mounted on the mount rubber R, the first through hole 1 It is to coincide with the axis 1L. Further, the upper surface 23 of the heat shield cover C is formed as an arc surface along the circumferential direction of the cover hole 20, and the end surface 24 on the opening side thereof is formed flat, and the first and second surfaces are formed at the center portions of the front and back surfaces. Arc-shaped detour recesses 25 (see FIG. 8) are formed so as to avoid the two through holes 2.

  As shown in FIGS. 4 to 8, U-shaped recessed portions 28 and 29 are respectively formed on the front and back surfaces 21 and 22 of the heat shield cover C so as to surround the cover hole 20, and vertically on both sides thereof. Convex ridges 30, 31; 32, 33 extending in a straight shape are formed, respectively, and a pair of convex portions 34, 35 are integrally formed on the left and right inner surfaces of the arcuate upper surface 23, respectively, and further, a heat shield cover Concave portions 36 and 37 are formed on the inner surfaces of the left and right side surfaces of C at positions corresponding to the bulging portions 9 and 10 of the mount rubber R. When the heat shield cover C is attached to the mount rubber R, the concave portions 36 and 37 are formed. The insertion portions 28, 29, the ridges 30, 31; 32, 33 and the projections 34, 35 are seated on the outer surface of the mount rubber R, and the recesses 36, 37 are engaged with the bulging portions 9, 10 of the mount rubber R. Combined with Mount Rubber R, Space (hollow layer) is formed stably between the heat cover C.

  As shown in FIG. 8, the heat shield cover C is attached to the mount rubber R from the longitudinal direction (vertical direction). In the mounted state, as shown in FIGS. 4 and 5, the heat shield cover C passes through the first through hole 1 from the one end (upper end) in the longitudinal direction (vertical direction) of the mount rubber R and passes through the second through hole 1. The entire region up to the front of the through hole 2 is covered. The end face 24 on the opening side of the heat shield cover C reaches a position just before the second through hole 2, and the bypass recess 25 formed in the end face 24 is an exhaust part inserted into the second through hole 2. Contact with the side support 46 is avoided.

  As shown in FIGS. 5 and 7, the first through hole 1 and the cover hole 20 that are coincident with each other are fitted with EPDM bushes 40 across the first through hole 1 and the cover hole 20, and are formed at both ends of the bush 40. The flange portion 40f is housed in an annular recess 20g around the cover hole 20 formed in the heat shield cover C, and is in close contact with the mount rubber R with the heat shield cover C interposed therebetween.

  As shown in FIGS. 2 and 3, the mount rubber R includes an upper support rod 45 which is a vehicle body side support portion fixed to a vehicle body B of an automobile, and an exhaust component side support portion fixed to the primary silencer M1. The upper support rod 45, the mount rubber R, and the lower support rod 46 are assembled with the lower support rod 46, and the support device S according to the present invention is configured.

  The generally horizontal poppet-shaped free end 45e of the upper support rod 45 is inserted into the cover hole 20 of the heat shield cover C and the first through hole 1 from one side of the heat shield cover C via the bush 40. Further, a substantially horizontal poppet-like free end 46 e of the exhaust part side support rod 46 is inserted only into the second through hole 2 from the other side of the heat shield cover C.

  The primary silencer M1, which is an exhaust component, is heated to high temperatures in response to exhaust heat from the exhaust gas, but the high heat can be effectively shielded by the heat shield cover C, and the heat is transmitted to the mount rubber R. Thus, it is possible to prevent the mount rubber R from changing its vibration isolation characteristics due to thermal deterioration.

  In particular, since the heat from the primary silencer M1 moves upward, the mount rubber R has a higher ambient temperature in the upper part, but the heat shield cover C is formed in a hat shape and is located above the mount rubber R. That is, since the portion from the vertical end of the mount rubber R to the front through the first through hole 1 to the second through hole 2 is covered, the mounting to the mount rubber R is easy and simple. With the simple structure, the entire upper portion of the mount rubber R can be reliably shielded from heat, and changes in the vibration isolation characteristics due to thermal deterioration of the mount rubber R can be effectively prevented.

  Further, since only the upper support rod 45 that is the vehicle body side support portion is inserted into the heat shield cover C, and the lower support rod 46 that is the exhaust component side support portion is not inserted into the heat shield cover C, the primary silencer that is an exhaust component. The vibration from M1 is not directly transmitted to the heat shield cover C, and the strength and durability of the heat shield cover C are not affected.

  In addition, since a space (hollow layer) is positively provided between the heat shield cover C and the mount rubber R, there is less contact between the heat shield cover C and the mount rubber R, and the heat shield cover C The heat conduction to the mount rubber R is reduced, the heat shield effect by the heat shield cover C is further improved, and the heat shield cover C does not affect the vibration isolation characteristics of the mount rubber R.

  Furthermore, since the bypass recess 25 for avoiding contact with the exhaust component side support portion is formed on the end surface on the opening side of the heat shield cover, vibration from the exhaust component side support portion is transmitted to the heat shield cover. Can be prevented more reliably.

  In the above embodiment, the mount rubber R, the bush 40 and the heat shield cover C are all formed of EPDM (ethylene propylene rubber). However, the mount rubber R is formed for the bush 40 and the heat shield cover C. It is formed of EPDM having a slightly higher hardness than EPDM.

  When EPDM (ethylene propylene rubber) is used as the material for the mount rubber R, if the temperature of the mount rubber R rises to about 130 °, the vibration-proof characteristics of the mount rubber R change due to thermal degradation. It is desirable to prevent the temperature from rising more than °. However, EPDM itself does not burn or emit smoke even if it rises above 130 °. There is no problem even if the temperature of the thermal cover (EPDM) C rises to 130 ° or more. Therefore, the same material (EPDM) as that of the mount rubber R is used for the heat shield cover that becomes higher in temperature than the mount rubber R.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

  For example, in the above-described embodiment, the present invention is applied to the case where the primary silencer M1 is supported on the vehicle body. However, this can of course be implemented to support exhaust parts such as exhaust pipes and other silencers on the vehicle body. In addition, the material of the heat insulating cover is not limited to EPDM, and may be other heat resistant rubber such as fluoro rubber as long as it has heat resistance equal to or higher than that of EPDM.

DESCRIPTION OF SYMBOLS 1 ...... 1st through-hole 2 ... 2nd through-hole 20 ...... Cover hole 24 ... ··· Open side 25 ··························································· Body support side
46 ... Exhaust part side support (lower support rod)
C ····· Heat shield R ····· Mount rubber

Claims (3)

A mount rubber (R) having a first through hole (1) and a second through hole (2) in the longitudinal direction;
An upper vehicle body support (45) inserted into the first through hole (1);
A lower exhaust component side support (46) inserted into the second through hole (2);
An exhaust part supporting apparatus comprising:
The mount rubber (R) is a mount rubber extending from one end in the longitudinal direction on the first through hole (1) side to the front through the first through hole (1) to the second through hole (2). (R) is covered with a separate rubber heat shield cover (C), and the heat shield cover (C) has a cover hole (20) formed at a position corresponding to the first through hole (1). ,
The vehicle body side support part (45) is inserted into both the cover hole (20) and the first through hole (1), and the exhaust part side support part (46) is inserted only into the second through hole (2). A device for supporting an exhaust part, wherein   The exhaust part supporting device according to claim 1, wherein a space is formed between the rubber heat shield cover (C) and the mount rubber (R).   The rubber heat shield cover (C) is formed in a hat shape and passes through the first through hole (1) from one end in the longitudinal direction on the first through hole (1) side, and the second To cover the entire area of the mount rubber (R) before reaching the through hole (2), and to prevent the end surface (24) on the opening side from coming into contact with the exhaust part side support portion (46). The exhaust part supporting device according to claim 1, wherein a bypass recess (25) is formed.

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