JP2010139021A - Exhaust pipe support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain performance from getting worse by a creep of a rubber-like elastomer. <P>SOLUTION: This exhaust pipe support device 10 includes a body elastic part 20 comprising the rubber-like elastomer, and the body elastic part includes the first holding part 14 having the first through hole 12 inserted with a support member 2 of a vehicle body 1 side, the second holding part 18 having the second through hole 16 provided penetratedly in axially parallel to the first through hole and inserted with a support member 3 of an exhaust pipe side, and provided relatively displaceably along a vertical direction Z with respect to the first holding part. The exhaust pipe support device 10 includes an outer member 22 comprising a rigid body for supporting surroundingly an outer circumference of the body elastic part 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a muffler hanger for an automobile, that is, an exhaust pipe support device for supporting an exhaust pipe in a vibration-proof manner with respect to a vehicle body.

Conventionally, the exhaust pipe support device is integrally formed of an elastic material such as rubber, and the first holding portion having a through hole into which the vehicle body side support material is inserted, and the exhaust pipe side support material are inserted. The second holding part having the through hole is connected by the left and right arch-shaped side walls so that both the through holes are parallel and face each other with a space in the vertical direction, and is configured in a substantially annular shape as a whole. There are known ones (for example, see Patent Document 1 below).
JP 2001-263418 A

  As described above, since the conventional support device is composed only of the rubber-like elastic body, the exhaust pipe falls to the lower side of the vehicle due to creep of the rubber-like elastic body over time, and the movement amount of the exhaust pipe is suppressed. The role of supporting the exhaust pipe may be impaired.

  In order to avoid this, the exhaust pipe support device is configured such that the main rubber part attached to the exhaust pipe side and the metal fitting attached to the vehicle body are vulcanized and bonded to fix the metal fitting to the vehicle body side. It is possible. However, in such a configuration, bolts and nuts are required to fix the metal fitting to the vehicle body side, which increases costs. Moreover, the man-hour for fixing to a vehicle body is also large.

  The present invention has been made in view of the above points, and an exhaust pipe support device capable of suppressing deterioration in performance due to creep of a rubber-like elastic body while suppressing an increase in cost and an increase in the number of assembling steps to a vehicle body. The purpose is to provide.

  An exhaust pipe support device according to the present invention includes a main body elastic portion made of a rubber-like elastic body, and the main body elastic portion is a first through hole into which one support material on the vehicle body side and the exhaust pipe side is inserted. And a first through hole provided in parallel with the first through hole and into which the other support member on the vehicle body side and the exhaust pipe side is inserted. And a second holding part that is disposed at an interval in the vertical direction and is capable of relative displacement in the vertical direction. The support device includes an outer member made of a rigid body that surrounds and supports the outer periphery of the elastic body.

  Thus, by setting the outer member made of a rigid body on the outer periphery of the main body elastic portion, the maximum displacement amount of the second holding portion relative to the first holding portion is limited within the range of the outer member surrounding the outer side, The maximum amount of displacement of the second holding part relative to the first holding part can be restricted, and therefore performance degradation due to creep of the rubber-like elastic body can be suppressed. The vehicle body side and the exhaust pipe side can be fixed in the same manner as a conventional support device consisting only of a rubber-like elastic body in which the respective support members are inserted into the first and second through holes. -Since it is not necessary to fix with nuts, etc., it is possible to suppress an increase in cost and an increase in the number of assembling steps to the vehicle body. In addition, the 1st holding | maintenance part and 2nd holding | maintenance part of a main body elastic part may be integrally connected, and can also be separately provided and provided.

  In the exhaust pipe support device, the second holding portion may have a pair of left and right elastic arms, and may be connected and supported to the pair of side walls of the outer member via the pair of elastic arms. Accordingly, the second holding portion can be provided so as to be capable of relative displacement in the vertical direction with respect to the first holding portion, and the effect of supporting the exhaust pipe in a vibration-proof manner with respect to the vehicle body can be enhanced.

  In the exhaust pipe support device, a stopper portion made of a rubber-like elastic body that restricts relative displacement in the vertical direction of the second holding portion is provided on the side opposite to the first holding portion with the second holding portion interposed therebetween. It can be provided inside the outer member. By providing such a stopper portion, the creep amount of the second holding portion can be regulated.

  In the exhaust pipe support device, the stopper portion may be formed of a rubber-like elastic body having a hardness different from that of the second holding portion. As described above, by using rubber-like elastic bodies having different hardnesses between the stopper portion and the second holding portion, it is possible to give a degree of freedom to the characteristics of the apparatus. For example, when the second holding part creeps and comes into contact with the stopper part, there is a concern about an increase in dynamic characteristics, but by setting the hardness of the stopper part low, it is possible to suppress such an increase in dynamic characteristics. it can.

  In the exhaust pipe support device, the stopper portion includes a first stopper convex portion projecting toward the second holding portion side, and the first stopper convex portion is provided by being divided into a plurality of convex portions. Also good. By changing the shape of the stopper portion in this way, it is possible to suppress an increase in dynamic characteristics at the time of contact between the second holding portion and the stopper portion.

  In the exhaust pipe support device, the first holding part protrudes toward the second holding part on a surface facing the second holding part to limit relative displacement in the vertical direction of the second holding part. A second stopper convex portion may be provided, and the first holding portion may be formed of a rubber-like elastic body having a hardness different from that of the second holding portion. As described above, the first holding portion is also formed of a rubber-like elastic body different from that of the second holding portion, so that the device characteristics can be further increased.

  In the exhaust pipe support device, a buffer layer made of a rubber-like elastic body may be provided on the outer peripheral surface of the outer member. By providing such a buffer layer, it is possible to suppress the generation of abnormal noise due to contact with peripheral components.

  In the exhaust pipe support device, the first through hole and the second through hole may be provided symmetrically with respect to the center of the outer member in the vertical direction. In this way, if the first and second through holes, which are the attachment positions on the vehicle body side and the exhaust pipe side, are set symmetrically with respect to the outer member, the characteristics can be established even if the support device is installed upside down. Can do.

  With the exhaust pipe support device of the present invention, it is possible to suppress a decrease in performance due to creep of the rubber-like elastic body while suppressing an increase in cost and an increase in the number of assembling steps to the vehicle body.

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

  1 to 3 show an exhaust pipe support device 10 according to the first embodiment. The support device 10 includes a first holding part 14 having a first through hole 12 into which the support member 2 on the vehicle body 1 side is inserted, and a second through hole 16 having a second through hole 16 into which the support member 3 on the exhaust pipe side is inserted. The main body elastic part 20 which consists of a rubber elastic body provided with the 2 holding | maintenance part 18 and the outer side member 22 which consists of the rigid body which surrounds the outer periphery of this main body elastic part 20 and is supported are comprised.

  The outer member 22 is a short-tube-shaped metal fitting, and has a rectangular shape with rounded corners when viewed from the front shown in FIG. 2, and a vertically long rectangular shape whose vertical direction Z is longer than the width direction Y. ing. And the axial direction X which is depth has comprised the short cylinder shape set short. In this example, the outer member 22 is made of a metal such as iron or aluminum. However, the outer member 22 may be made of a resin to reduce the weight.

  The first holding part 14 of the main body elastic part 20 is provided on the upper part of the support device 10 and is formed so as to fill the upper space inside the outer member 22. The first holding portion 14 is provided by vulcanization bonding on the upper wall 22A of the outer member 22 and the upper portions of a pair of left and right side walls 22B, 22B extending downward from both ends of the upper wall 22A. The first through hole 12 is a circular hole provided in the center of the first holding portion 14 in the width direction Y, and is provided so as to penetrate in parallel to the axial direction X of the outer member 22.

  The second holding portion 18 of the main body elastic portion 20 is located slightly below the central portion of the support device 10 and is provided at an interval in the vertical direction Z with respect to the first holding portion 14. The second through hole 16 is a circular hole having the same diameter as that of the first through hole 12, and penetrates the first through hole 12 in the center in the width direction Y of the support device 10 in parallel with the first through hole 12. Is provided.

  The second holding portion 18 is connected and supported by a pair of left and right elastic arm portions 24 and 24 to a pair of side walls 22B and 22B of the outer member 22 facing the left and right sides of the second holding portion 18 with the second holding portion 18 interposed therebetween. Yes. That is, the second holding portion 18 includes a pair of left and right elastic arm portions 24, 24 extending on both sides in the width direction Y, and the pair of elastic arm portions 24, 24 causes the left and right side walls 22 </ b> B of the outer member 22. Vulcanized to 22B. Thereby, the 2nd holding | maintenance part 18 is formed so that a displacement in the up-down direction Z is possible.

  The elastic arm portion 24 is thinner than the second holding portion main body 18A at the center in the width direction having the second through hole 16, and connects the second holding portion main body 18A and the side wall 22B. It is a horizontal rubber wall. Therefore, the second holding portion 18 is formed in a convex shape up and down in the second holding portion main body 18A at the center in the width direction.

  On the inner side of the outer member 22 on the opposite side of the first holding portion 14 with the second holding portion 18 in between, the displacement in the vertical direction Z of the second holding portion 18 (specifically, downward displacement) is limited. A stopper portion 26 made of a rubber elastic body is provided. That is, in this example, the stopper portion 26 is provided on the bottom wall 22C of the outer member 22 by vulcanization adhesion so as to face the lower surface side of the second holding portion 18. ing. The stopper portion 26 is configured by a first stopper convex portion 28 that protrudes toward the second holding portion 18 side, that is, upward, and faces the lower surface of the second holding portion 18 with a predetermined interval in the vertical direction Z. Has been.

  On the other hand, the first holding portion 14 is provided with a second stopper convex portion 30 that restricts displacement (specifically, upward displacement) in the vertical direction Z of the second holding portion 18. The second stopper protrusion 30 is provided on the lower surface of the first holding portion 14 facing the second holding portion 18 so as to protrude toward the second holding portion 18 side, that is, downward. It is opposed to the upper surface at a predetermined interval in the vertical direction Z.

  As shown in FIG. 2A, the first holding part 14 and the second holding part 18 are connected via a thin elastic film 32 that covers the side wall 22 </ b> B of the outer member 22. Further, the second holding portion 18 and the stopper portion 26 are connected via a thin elastic film 34 that covers the side wall 22 </ b> B of the outer member 22. Thereby, the 1st holding | maintenance part 14 and the 2nd holding | maintenance part 18 of the main body elastic part 20, and the stopper part 26 are integrally formed by the rubber elastic body, and the outer member 22 surrounds the outer periphery over the perimeter. Is vulcanized and bonded.

  As shown in FIG. 3, the support device 10 having the above configuration is such that the support member 2 on the vehicle body 1 side is inserted and fixed in the first through hole 12 of the upper first holding portion 14, and the lower second holding portion. The support member 3 on the exhaust pipe side is inserted into the second through hole 16 of 18 and fixed. Thereby, the exhaust pipe is supported in a suspended state with respect to the vehicle body 1.

  In the support device 10 of the present embodiment, the second holding portion 18 attached to the exhaust pipe side is connected and supported to the outer member 22 by the left and right elastic arm portions 24, 24. With respect to the vertical vibration, the second holding portion 18 is elastically deformed in the vertical direction Z, thereby absorbing the vibration and supporting the vibration-proof exhaust pipe.

  In the present embodiment, by providing the outer member 22 serving as an outer shell around the main body elastic portion 20, the maximum displacement amount of the second holding portion 18 relative to the first holding portion 14 can be regulated. . Further, by providing the stopper portion 26 below the second holding portion 18 that supports the exhaust pipe, the creep amount of the second holding portion 18 can be regulated. Therefore, it is possible to maintain the function as an exhaust pipe support device that regulates the amount of movement of the exhaust pipe while suppressing drooping of the exhaust pipe over time.

  Further, the vehicle body side and the exhaust pipe side can be fixed simply by inserting the support members 2 and 3 into the first and second through holes 12 and 16 and not by bolts or nuts. Thus, it is possible to suppress an increase in cost and an increase in the number of assembling steps for the vehicle body.

  FIG. 4 shows an exhaust pipe support device 10A according to the second embodiment. This example differs from the above embodiment in that a buffer layer 36 made of a rubber elastic body is provided on the outer peripheral surface of the outer member 22.

  That is, in this example, a thin buffer layer 36 made of a rubber elastic body is provided on the outer peripheral surfaces of the upper wall 22A, the left and right side walls 22B and 22B, and the bottom wall 22C of the outer member 22 by vulcanization adhesion. ing. More specifically, as shown in FIG. 4B, the dimension of the outer member 22 in the axial direction X is set to be shorter than that of the main body elastic portion 20, so that the buffer layer 36 has the shaft of the outer member 22. It is connected to the main body elastic portion 20 via a rubber elastic body layer 38 located outward in the direction. Thereby, the outer member 22 is provided in a state of being embedded in a rubber elastic body constituting the main body elastic portion 20.

  In the second embodiment, by providing the buffer layer 36 on the outer peripheral surface of the outer member 22, it is possible to suppress the generation of abnormal noise due to contact with peripheral components. Other configurations and operational effects are the same as those of the first embodiment.

  FIG. 5 shows an exhaust pipe support device 10B according to the third embodiment. In this example, the stopper part 26 is different from the first embodiment in that the stopper part 26 is formed of a rubber elastic body having a hardness different from that of the main body elastic part 20 including the second holding part 18.

  That is, in this example, the rubber hardness of the stopper part 26 and the main body elastic part 20 on the upper side is changed by two-layer molding. Specifically, the elastic film 34 that connects the stopper portion 26 and the main body elastic portion 20 is set such that there is an interface 40 between two rubber elastic bodies having different hardnesses.

  As described above, by using rubber elastic bodies having different hardnesses between the stopper portion 26 and the second holding portion 18, it is possible to give a degree of freedom to the characteristics of the support device 10 </ b> B.

  For example, when the rubber hardness of the stopper portion 26 is set to be smaller than the rubber hardness of the second holding portion 18, the following operational effects are exhibited. That is, when the stopper portion 26 is provided, there is a concern that the dynamic characteristics may increase when the second holding portion 18 creeps and contacts the stopper portion 26 over time. On the other hand, by setting the rubber hardness of the stopper portion 26 low, it is possible to suppress the increase in dynamic characteristics and softly support the exhaust pipe. Further, even in the stage before creep, the rubber hardness of the second holding portion 18 is high, so that the vertical displacement of the exhaust pipe when the exhaust pipe is supported by the second holding portion 18 is suppressed, and the stopper is caused by excessive displacement. Even when abutting against the portion 26, the rubber hardness of the stopper portion 26 is low, so that a rapid increase in the spring constant can be suppressed.

  On the contrary, when the rubber hardness of the stopper portion 26 is set to be larger than the rubber hardness of the second holding portion 18, when the normal exhaust pipe vibrates, the rubber hardness of the second holding portion 18 is low. The stopper effect can be enhanced by the stopper portion 26 having high rubber hardness when it is in contact with the stopper portion 26 due to excessive displacement while suppressing the transmission of vibration while softly supporting. Other configurations and operational effects are the same as those of the first embodiment.

  FIG. 6 shows an exhaust pipe support device 10C according to the fourth embodiment. In this example, the point which formed the 1st holding | maintenance part 14 and the 2nd holding | maintenance part 18 with the rubber elastic body from which hardness differs is different from the said 3rd Embodiment.

  That is, in this example, the rubber hardness of the 1st holding | maintenance part 14 provided with the 2nd stopper convex part 30 and the 2nd holding | maintenance part 18 of the lower side is changed. Specifically, the elastic film 32 that connects the first holding unit 14 and the second holding unit 18 is set so that an interface 42 between two rubber elastic bodies having different hardness exists.

  As described above, by changing the rubber hardness of the first holding portion 14 in addition to the stopper portion 26 and the second holding portion 18, it is possible to give further flexibility to the characteristics of the support device 10 </ b> C.

  For example, when the rubber hardness of the first holding unit 14 is set to be smaller than the rubber hardness of the second holding unit 18, the exhaust pipe is connected to the exhaust pipe by the second holding unit 18 because the rubber hardness of the second holding unit 18 is high. When the second holding part 18 abuts against the second stopper convex part 30 of the first holding part 14 due to excessive displacement while suppressing the vertical displacement of the exhaust pipe when supporting, the rubber hardness of the first holding part 14 Is low, an abrupt increase in the spring constant can be suppressed.

  On the contrary, when the rubber hardness of the first holding part 14 is set larger than the rubber hardness of the second holding part 18, when the normal exhaust pipe vibrates, the rubber hardness of the second holding part 18 is low. When the second holding part 18 comes into contact with the second stopper convex part 30 of the first holding part 14 due to excessive displacement while supporting the exhaust pipe softly and suppressing transmission of vibration, the second stopper having high rubber hardness The stopper effect can be enhanced by the convex portion 30. Other configurations and operational effects are the same as those of the third embodiment.

  FIG. 7 shows an exhaust pipe support device 10D according to the fifth embodiment. This example differs from the first embodiment in that the first stopper convex portion 28 of the stopper portion 26 is provided by being divided into a plurality of convex portions.

  In other words, in this example, the first stopper convex portion 28 is divided into three convex portions 28A, 28B, and 28C in the width direction Y. By changing the shape of the first stopper convex portion 28 in this way, as in the third embodiment, when the second holding portion 18 creeps and contacts the stopper portion 26, a plurality of convex portions 28A, Since the 2nd holding part 18 can be supported softly by the 1st stopper convex part 28 divided | segmented into 28B and 28C, the raise of a dynamic characteristic can be suppressed. Other configurations and operational effects are the same as those of the first embodiment.

  In addition, it is also possible to apply a combination of such a shape change of the first stopper protrusion 28 and a change in rubber hardness as in the third embodiment, thereby further increasing the flexibility of the characteristics of the support device. Can be made.

  FIG. 8 shows an exhaust pipe support device 10E according to the sixth embodiment. This example is different from the first embodiment in that the positions of the through holes 12 and 16 are set symmetrically with respect to the outer member 22.

  That is, in this example, the first through hole 12 and the second through hole 16 are provided vertically symmetrically with respect to the center line S in the vertical direction Z of the outer member 22, and accordingly, the first through hole from the center line S is provided. The distance D1 to the center of the hole 12 and the distance D2 from the center line S to the center of the second through hole 16 are set to be the same (that is, D1 = D2).

  As described above, if the first through hole 12 and the second through hole 16 that are the mounting positions on the vehicle body side and the exhaust pipe side are set vertically symmetrical with respect to the outer member 22, the support device 10E can be mounted upside down. The same characteristics can be established. In this example, since the second holding portion 18 is displaced in the vertical direction Z, the vehicle body side (fixed side) and the exhaust pipe side (vibrator side) are inserted into the second through hole 16 on the second holding portion 18 side. ) Depending on which one is attached, the dynamic characteristics are the same, but the movement of the support device 10E as a whole is different. Other configurations and operational effects are the same as those of the first embodiment.

  In each of the above embodiments, the first holding part 14, the second holding part 18 and the stopper part 26 are connected and provided via the elastic films 32 and 34, but can also be provided separately. FIG. 9 shows an exhaust pipe support device 10F according to a seventh embodiment as an example. In this example, the elastic film 32 that has connected the first holding part 14 and the second holding part 18 and the elastic film 34 that has connected the stopper part 26 and the main body elastic part 20 in the fourth embodiment are as follows. Accordingly, the first holding portion 14, the second holding portion, and the stopper portion 26 are provided separately from each other.

  The other configuration is the same as that of the fourth embodiment. Therefore, the first holding portion 14 and the second holding portion 18 are formed of rubber elastic bodies having different hardnesses, and the second holding portion 18 and the stopper portion 26 are formed. Are formed of rubber elastic bodies having different hardnesses, and the boundaries of the rubber elastic bodies having different hardnesses are separated without being coupled.

  Thus, in this invention, the 1st holding | maintenance part 14 and the 2nd holding | maintenance part 18 which comprise the main body elastic part 20 do not necessarily need to be integrated, and the case where it is separate is also contained. That is, the shape is not particularly limited as long as the main body elastic portion 20 having the first holding portion 14 and the second holding portion 18 is provided inside the outer member 22 serving as the outer shell.

  Further, in the above embodiment, the elastic arm portion 24 is provided only in the second holding portion 18 so as to be displaceable in the vertical direction Z. However, the same elastic arm portion is also provided in the first holding portion 14 to provide the vertical direction Z. It can also be formed to be displaceable. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

1 is a perspective view of an exhaust pipe support device according to a first embodiment. (A) Front view of the supporting device, (b) II-II sectional view Sectional drawing which shows the assembly | attachment state to the vehicle of the support apparatus (A) Sectional drawing of the exhaust pipe supporting device which concerns on 2nd Embodiment, (b) The IV-IV sectional view taken on the line Sectional drawing of the support apparatus for exhaust pipes concerning 3rd Embodiment Sectional drawing of the exhaust pipe supporting device which concerns on 4th Embodiment Front view of an exhaust pipe support device according to a fifth embodiment Front view of an exhaust pipe support device according to a sixth embodiment Sectional drawing of the exhaust pipe supporting device which concerns on 7th Embodiment

Explanation of symbols

10, 10A, 10B, 10C, 10D, 10E, 10F ... exhaust pipe support device 12 ... first through hole 14 ... first holding part 16 ... second through hole 18 ... second holding part 20 ... main body elastic part 22 ... outside Member, 22A ... upper wall, 22B ... side wall, 22C ... bottom wall 24 ... elastic arm part 26 ... stopper part 28 ... first stopper convex part, 28A-C ... convex part 30 ... second stopper convex part 36 ... buffer layer X ... Axial direction, Y ... Width direction, Z ... Vertical direction

Claims (8)

An exhaust pipe support device for supporting an exhaust pipe suspended from a vehicle body,
A first holding portion having a first through hole into which one support member on the vehicle body side and the exhaust pipe side is inserted;
The second through hole is provided in parallel with the first through hole and into which the other support member on the vehicle body side and the exhaust pipe side is inserted, and is spaced vertically from the first holding portion. A second holding portion that is arranged in the vertical direction and is capable of relative displacement in the vertical direction;
A main body elastic portion made of a rubber-like elastic body, and
An outer member made of a rigid body surrounding and supporting the outer periphery of the main body elastic portion;
An exhaust pipe support device comprising:   The second holding portion has a pair of left and right elastic arm portions, and is connected to and supported by the pair of side walls of the outer member via the pair of elastic arm portions, so that the second holding portion can be relatively displaced in the vertical direction. The exhaust pipe support device according to claim 1 provided.   A stopper portion made of a rubber-like elastic body that restricts relative displacement in the vertical direction of the second holding portion is provided inside the outer member on the opposite side of the first holding portion with the second holding portion interposed therebetween. The exhaust pipe support device according to claim 1 or 2.   The exhaust pipe support device according to claim 3, wherein the stopper portion is made of a rubber-like elastic body having a hardness different from that of the second holding portion.   The said stopper part consists of the 1st stopper convex part which protrudes toward the said 2nd holding | maintenance part side, The said 1st stopper convex part was divided | segmented and provided in the some convex part. Support device for exhaust pipe.   The first holding portion includes a second stopper convex portion that protrudes toward the second holding portion side on a surface facing the second holding portion and restricts relative displacement in the vertical direction of the second holding portion, The exhaust pipe support device according to any one of claims 1 to 5, wherein the first holding part is made of a rubber-like elastic body having a hardness different from that of the second holding part.   The exhaust pipe support device according to any one of claims 1 to 6, wherein a buffer layer made of a rubber-like elastic body is provided on an outer peripheral surface of the outer member.   The exhaust pipe support device according to any one of claims 1 to 7, wherein the first through hole and the second through hole are provided vertically symmetrically with respect to a center in a vertical direction of the outer member.

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