JP2013071509A - Support device of exhaust pipe for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support device of an exhaust pipe for a vehicle capable of improving mountability, reducing the vibration of an engine or vibration transmitted to a car body from the engine, and also reducing vibration that is transmitted to the car body from an exhaust pipe by reducing the vibration of the exhaust pipe.SOLUTION: In a support device 3 of an exhaust pipe for a vehicle, a mount leg 27 is provided upright on a suspension frame 1, and the rear side along the front/rear direction of a vehicle on an engine 11 is supported by the upper part of the mount leg 27 through an elastic member 25. An exhaust pipe 4 disposed along the front/rear direction of the vehicle is supported at the suspension frame 1 side. The support device includes a bracket 31 attached to the mount leg 27, an exhaust pipe mount member 34 which is provided at the bracket 31 and has elasticity, and an exhaust pipe connection member 38 which is provided at the exhaust pipe mount member 34 and connected to the exhaust pipe 4.

Description

  The present invention relates to a vehicle exhaust pipe support device.

  Conventionally, as a technique for attaching an exhaust pipe extending in the vehicle longitudinal direction in the vicinity of the center in the vehicle width direction of the subframe extending in the vehicle width direction, the position closer to the width direction side than the center in the vehicle width direction of the rear cross member of the subframe In addition, a support device in which a mount member is arranged is known (for example, see Patent Document 1). In this support device, the exhaust pipe is disposed so as to extend in the vehicle front-rear direction below the rear cross member. The exhaust pipe is supported by a stay extending from the mount member in the vehicle width direction.

JP 2010-13062 A

  However, in the above support device, since the mount member is attached to a position closer to the side than the center of the rear cross member, the length of the stay connecting the mount member and the exhaust pipe is increased, and the exhaust pipe is There was a risk of vibration. When the exhaust pipe easily vibrates in this way, there arises a problem that vibration transmitted from the exhaust pipe to the vehicle body increases.

  Further, in the above support device, since the exhaust pipe is disposed below the rear cross member, the mount member is also disposed at a relatively low position of the rear cross member. For this reason, the arrangement position of the exhaust pipe is lower than the height position equivalent to the mount member or the mount member. In general, in the exhaust pipe, when the portion suspended by the mount member is warped upward (curved) due to thermal deformation or the like, a problem such as the exhaust pipe hanging down obliquely occurs. Therefore, when the mount member is at a low position, it may be difficult to suspend the exhaust pipe with the mount member. Moreover, in said support apparatus, there existed a possibility that the assembly | attachment precision of an exhaust pipe might fall and the attachment property of an exhaust pipe might fall.

  In general, an engine or a rear portion of a power train including the engine is supported by a subframe via a rear mount device (engine mount). Due to such an engine mount structure, when the natural frequency of the engine and the natural frequency of the rear mount device approximate, the engine and the rear mount device resonate and the vibration of the engine or power train increases. There are concerns. When the exhaust pipe support device described above is applied to such an engine mount structure, the exhaust pipe may be affected by the vibration of the engine or power train.

  The present invention has been made in view of the above-described problems, and has improved mounting properties, can reduce engine vibration and vibration transmitted from the engine to the vehicle body, reduce exhaust pipe vibration, and reduce exhaust vibration from the exhaust pipe. It is an object of the present invention to provide a vehicle exhaust pipe support device that reduces vibration transmitted to a vehicle body.

  In order to solve the above-described problems and achieve the object, according to an aspect of the present invention, a mount leg is erected on a suspension frame provided along a vehicle width direction at a lower part of a vehicle body, and an upper part of the mount leg is provided. A vehicle exhaust pipe that supports an exhaust pipe that is arranged along the vehicle longitudinal direction across the suspension frame on the suspension frame side is supported by an elastic member on the rear side of the engine in the vehicle longitudinal direction. A support device, a bracket attached to the mount leg, an exhaust pipe mount member having elasticity provided in the bracket, and an exhaust pipe connection member provided in the exhaust pipe mount member and connected to the exhaust pipe And.

  As a said aspect, the vertical plate part which protrudes in the vehicle front-back direction back from a mount leg part is provided in a bracket, and it can be set as the structure by which an exhaust pipe mount member is fixed to this vertical plate part with a volt | bolt.

  As said aspect, it is preferable that the exhaust pipe connection member is attached to the connection part of the upstream exhaust pipe and downstream exhaust pipe of an exhaust pipe. Moreover, as said aspect, it is preferable to arrange | position so that an exhaust pipe may pass the vicinity of an exhaust pipe mounting member. Further, as the above aspect, it is preferable that the exhaust pipe mounting member is disposed above the suspension frame.

  According to the present invention, in an exhaust pipe support device for a vehicle, the exhaust pipe can be attached more easily, and vibrations of the engine and vibrations transmitted from the engine to the vehicle body can be reduced. There is an effect of reducing vibration transmitted from the vehicle to the vehicle body.

FIG. 1 is a side view of an essential part of a vehicle including a vehicle exhaust pipe support device according to an embodiment of the present invention. FIG. 2 is a perspective view of a main part of the vehicle including the vehicle exhaust pipe support device according to the embodiment of the present invention. FIG. 3 is a main part rear view of the vehicle provided with the vehicle exhaust pipe support device according to the embodiment of the present invention.

  Below, the detail of the support apparatus of the exhaust pipe for vehicles which concerns on embodiment of this invention is demonstrated based on drawing. However, it should be noted that the drawings are schematic, and the dimensions and ratios of the members are different from actual ones. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings is contained.

  In the present embodiment, as shown in FIG. 1, in a vehicle including a power train 10 having an engine 11, the exhaust pipe 4 connected to the engine 11 is mounted on a rear mount device 2 provided on the suspension frame 1. The support device 3 is attached to the leg portion 27. That is, in the present embodiment, the exhaust pipe 4 is attached to the mount leg 27 of the rear mount device 2 that is a member on the suspension frame 1 side. In addition, this invention is not limited to a vehicle like this Embodiment, It can apply to the various vehicles provided with an engine.

  As shown in FIGS. 1 and 3, the power train 10 having the engine 11 is disposed in the engine room on the front side in the vehicle front-rear direction of the suspension frame 1. An engine side mounting bracket 12 is fixed to the rear portion of the power train 10 with bolts 13. An upstream side exhaust pipe 4 </ b> A is connected to the lower part of the engine 11. The upstream side exhaust pipe 4A is arranged so as to extend along the vehicle front-rear direction through the upper side of the suspension frame 1 from the front side in the vehicle front-rear direction of the suspension frame 1 toward the rear side.

  As shown in FIGS. 1 and 3, the upstream exhaust pipe 4A extends to a position slightly behind the suspension frame 1, and the downstream exhaust pipe 4B is connected to the rear end. The upstream exhaust pipe 4A and the downstream exhaust pipe 4B constitute the exhaust pipe 4. As shown in FIG. 3, the rear end portion of the upstream side exhaust pipe 4A and the front end portion of the downstream side exhaust pipe 4B are connected and fixed by connecting the connecting flange portions 39A and 39B with bolts 41 and nuts 42 (see FIG. 2). Has been.

  As shown in FIG. 1, a silencer 41 is provided in the middle of the downstream exhaust pipe 4B. The downstream end of the silencer 41 in the downstream exhaust pipe 4B is suspended to the vehicle body side by the muffler hanger 5. In the muffler hanger 5, a muffler side connecting rod 51 and a vehicle body side connecting rod 53 connected to a downstream end of the silencer 41 are connected via an elastic member 52. The vehicle body side connecting rod 53 is provided with a mounting plate 54 for mounting on the vehicle body side.

  A rear mount device 2 is provided on the upper surface of the central portion of the suspension frame 1. The rear mount device 2 has two mount legs 21 and 27 that are bifurcated and are erected so as to be lined up in the front-rear direction. A hollow cylindrical rear mount bracket 23 is provided at a portion where the two mount legs 21 and 27 are coupled. The central axis of the rear mount bracket 23 is parallel to the vehicle width direction. The lower portions of the mount legs 21 and 27 are fixed to the suspension frame 1 with bolts 24. In FIGS. 1 and 2, only the plate portion 22 below the mount leg portion 21 is shown.

  A cylindrical elastic member 25 is disposed in the rear mount bracket 23 so as to be in close contact with the inner wall of the rear mount bracket 12. A mounting pipe 26 is provided at the center of the elastic member 25 so as to penetrate along the central axis direction parallel to the vehicle width direction. As shown in FIG. 3, the above-described engine-side mount bracket 12 is assembled to the mount pipe 26 provided on the elastic member 25, and the bolt 13 is inserted into the mount pipe 26 and the engine-side mount bracket 12. It is fixed to the rear mount device 2 side.

  As shown in FIG. 2, the support device 3 is provided on a bracket 31 attached to the mount leg 27, an elastic exhaust pipe mount member 34 provided on the bracket 31, and the exhaust pipe mount member 34. And an exhaust pipe connecting member 38 connected to the exhaust pipe 4.

  As shown in FIG. 2, the bracket 31 has a shape in which metal plates are bent so as to be perpendicular to each other. The bracket 31 is attached to a side surface of the mount leg 27 in the vehicle width direction (right side indicated by an arrow in FIG. 2) with a bolt 28 and protrudes rearward in the vehicle front-rear direction from the mount leg 27. The leg portion mounting plate portion 32 has a vertical plate portion 33 that is perpendicular to the leg portion mounting plate portion 32 and is disposed in parallel to the left-right direction indicated by the arrows in FIG.

  An exhaust pipe mount member 34 made of an elastic material such as rubber is fixed to the rear surface of the vertical plate portion 33 in the vehicle front-rear direction by bolts 35 and nuts 36, for example. The exhaust pipe mount member 34 has a size that hangs downward from the vertical plate portion 33 when fixed to the vertical plate portion 33. A connecting rod 37 forming a part of the exhaust pipe connecting member 38 is attached to the lower part of the exhaust pipe mounting member 34 that is positioned below the vertical plate portion 33 so as to hang down from the vertical plate portion 33. The connecting rod 37 is set to a short length, and is set so that the exhaust pipe 4 supported by the exhaust pipe connecting member 38 is positioned in the vicinity of the exhaust pipe mounting member 34.

  As shown in FIGS. 1 and 3, the exhaust pipe connecting member 38 is attached to a connecting portion between the upstream side exhaust pipe 4 </ b> A and the downstream side exhaust pipe 4 </ b> B constituting the exhaust pipe 4. As shown in FIG. 1, in the present embodiment, the exhaust pipe connecting member 38 is overlapped and fixed to the connecting flange portion 39A on the upstream exhaust pipe 4A side.

  As shown in FIG. 1, in the present embodiment, the distance L between the exhaust pipe mount member 34 and the elastic member 52 of the muffler hanger 5 is adjusted by moving the muffler hanger 5 in the front-rear direction indicated by the arrow a. The load applied to the device 2 can be changed. By adjusting the position of the muffler hanger 5 in this way, the function as a mass damper can be adjusted.

  In the present embodiment, by appropriately setting the spring constant of the exhaust pipe mount member 34, the exhaust pipe 4 supported by the support device 3 can function as a dynamic damper. That is, the exhaust pipe 4 supported by the support device 3 functions as a dynamic damper, thereby canceling vibrations from the engine 11 transmitted from the rear mount device 2 or suppressing vibrations, thereby reducing the low vibration and quietness of the vehicle. Can be improved.

  In the support device 3 according to the present embodiment, the exhaust pipe mounting member 34 can be provided on the upper portion of the mount leg portion 27 erected on the suspension frame 1, so that the exhaust pipe 4 can be disposed at a high position. The distance from 4 to the road surface can be increased. For this reason, the exhaust pipe 4 is less susceptible to interference from the road surface, and adverse effects on the exhaust pipe 4 and the exhaust pipe mounting member 34 can be prevented.

  In the support device 3 according to the present embodiment, the exhaust pipe mount member 34 can be disposed at a higher position than the exhaust pipe 4, that is, the exhaust pipe mount member 34 is not disposed at a lower position. When assembling, the exhaust pipe 4 can be attached to the exhaust pipe connecting member 38 provided on the exhaust pipe mounting member 34 so as to be easily and reliably suspended. Therefore, in the support device 3 according to the present embodiment, the assembling property between the exhaust pipe 4 and the vehicle body can be improved.

  In the support device 3 according to the present embodiment, the exhaust pipe 4 having a heavy weight can be supported by the rear mount device 2 via the exhaust pipe mounting member 34. Therefore, the exhaust pipe 4 becomes a mass, and the exhaust pipe 4 as described above. Can function as a dynamic damper. Accordingly, the natural frequency of the rear mount device 2 can be increased to prevent the engine 11 and the rear mount device 2 from resonating, and the increase in vibration of the engine 11 can be suppressed. Further, the vibration transmitted from the engine 11 to the vehicle body is transmitted from the elastic member 25 of the rear mount device 2 to the vehicle body via the mount leg 27, and the exhaust pipe as a mass attached to the mount leg 27 is being transmitted. 4 is reduced. For this reason, there exists an effect which reduces the vibration transmitted to a passenger from a vehicle body.

  The support device 3 according to the present embodiment can be disposed at the center in the vehicle width direction by attaching the support device 3 to the rear mount device 2 located near the center in the vehicle width direction. For this reason, the exhaust pipe mounting member 34 can be brought close to the exhaust pipe 4 disposed along the front-rear direction in the center of the suspension frame 1 in the vehicle width direction. Therefore, the distance between the portion where the exhaust pipe mount member 34 is supported and the exhaust pipe 4 or the distance between the exhaust pipe mount member 34 and the exhaust pipe 4 can be shortened. As a result, the length of the connecting rod 37 that connects the exhaust pipe mounting member 34 and the exhaust pipe 4 can be shortened. Therefore, the rear mount device 2 can suppress an increase in amplitude and vibration of the exhaust pipe 4, and the exhaust pipe 4 can be stably disposed on the vehicle body, and vibration transmitted from the exhaust pipe 4 to the vehicle body can be reduced.

  In the support device 3 according to the present embodiment, the connecting plate 37 and the exhaust pipe mounting member 34 can be arranged side by side in the vehicle front-rear direction by arranging the vertical plate portion 33 in the bracket 31 in parallel with the vehicle width direction. Since the leg attachment plate 32 in the bracket 31 protrudes rearward in the vehicle front-rear direction from the mount leg 27, the exhaust pipe mounting member 34 can be brought closer to the connecting rod 37. That is, the connecting rod 37 that communicates between the exhaust pipe mounting member 34 and the exhaust pipe 4 can be made shorter. For this reason, the exhaust pipe 4 can be stably held by the connecting rod 37, and vibration transmitted from the exhaust pipe 4 to the vehicle body can be reduced.

  In the support device 3 according to the present embodiment, the exhaust pipe mount member 34 is directly attached to the vertical plate portion 33 by the bolt 35, so that the exhaust pipe mount member 34 can be stably fixed to the vertical plate portion 33 of the bracket 31. Shaking between the tube mount member 34 and the bracket 31 can be suppressed. As a result, vibration transmitted from the exhaust pipe mounting member 34 to the bracket 31 can be reduced.

  By the way, the upstream side exhaust pipe 4A and the downstream side exhaust pipe 4B are connected by a bolt or the like using a tool. However, if the operator forgets to tighten the connection between the upstream side exhaust pipe 4A and the downstream side exhaust pipe 4B with a prescribed torque, the worker will rattle at the connection part between the upstream side exhaust pipe 4A and the downstream side exhaust pipe 4B during vehicle travel. There is a possibility that the vibration of the exhaust pipe 4 as a whole increases. In the support device 3 according to the present embodiment, the connecting portion where the upstream side exhaust pipe 4A and the downstream side exhaust pipe 4B are connected is in the vicinity of the exhaust pipe mounting member 34 and at the same position in the height direction, or more The exhaust pipe connecting member 38 is connected to the connecting portion by being disposed at a low position. For this reason, even if the operator forgets to tighten the connection portion with the prescribed torque, and the rattling or the increase in the amplitude occurs in the connection portion, the movement of the connection portion is regulated or relaxed by the exhaust pipe mounting member 34. can do. In addition, vibration transmitted from the connecting portion to the entire exhaust pipe 4 can be suppressed. As a result, even when tightening with the prescribed torque as described above is forgotten, the exhaust pipe 4 can be stably supported on the vehicle body, and vibration transmitted from the exhaust pipe 4 to the vehicle body can be reduced.

(Other embodiments)
Although the embodiment has been described above, it should not be understood that the description and the drawings constituting a part of the disclosure of the embodiment limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the above embodiment, the exhaust pipe mounting member 34 is provided on the vertical plate portion 33 that is parallel to the vehicle width direction, but the present invention is not limited to this.

  Further, in the above embodiment, the support device 3 is attached to the mount leg portion 27 located on the rear side in the rear mount device 2, but the support device 3 may be attached to the mount leg portion 21 located on the front side.

DESCRIPTION OF SYMBOLS 1 Suspension frame 2 Rear mount apparatus 3 Support apparatus 4 Exhaust pipe 4A Upstream exhaust pipe 4B Downstream exhaust pipe 10 Power train 11 Engine 25 Elastic member 27 Mount leg part 31 Bracket 32 Leg part attaching plate part 33 Vertical plate part 34 Exhaust pipe Mount member 35 Bolt 37 Connecting rod 38 Exhaust pipe connecting member 39A, 39B Connecting flange

Claims (5)

Mount legs are erected on a suspension frame provided at the lower part of the vehicle body along the vehicle width direction, and the rear part of the engine in the vehicle longitudinal direction is supported on the upper part of the mount legs via elastic members,
A vehicle exhaust pipe support device for supporting an exhaust pipe disposed on the suspension frame side and crossing the suspension frame along the vehicle longitudinal direction,
A bracket attached to the mounting leg;
An exhaust pipe mounting member having elasticity provided in the bracket;
An exhaust pipe connecting member provided on the exhaust pipe mounting member and connected to the exhaust pipe;
An exhaust pipe support device for a vehicle, comprising:   The said bracket is provided with the vertical board part which protrudes in the vehicle front-back direction back from the said mount leg part, The said exhaust pipe mounting member is being fixed to the said vertical board part with the volt | bolt. Support device for vehicle exhaust pipe.   3. The vehicle exhaust pipe support according to claim 1, wherein the exhaust pipe connection member is attached to a connection portion between an upstream exhaust pipe and a downstream exhaust pipe of the exhaust pipe. apparatus.   The exhaust pipe support device for a vehicle according to any one of claims 1 to 3, wherein the exhaust pipe is disposed so as to pass through the vicinity of the exhaust pipe mounting member.   The vehicle exhaust pipe support device according to any one of claims 1 to 4, wherein the exhaust pipe mount member is disposed above the suspension frame.

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