JP2008215240A - Exhaust system member supporting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust system member supporting structure for suppressing the occurrence of booming noise in a vehicle body by suppressing the transmission of vibration from an engine via an exhaust system member to the vehicle body. <P>SOLUTION: A muffler 25 is installed so that a center line C1 passing through a gravity center G1 of the muffler 25 extends approximately parallel to a rocking center line A1 of a ball joint 26, and the muffler 25 is mounted on a vehicle body frame 35 via muffler side supporting members 34 of the muffler 25 provided at both cross ends of a vehicle. The muffler side supporting members 34 are mounted on the muffler 25 so that a turning center D1 mutually connecting the other ends 34b of the muffler side supporting members 34, as a mounting position of the vehicle body frame 35 is approximately parallel to the rocking center line A1 of the ball joint 26 and adjacent to the center line C1 passing through the gravity center G1 of the muffler 25. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a support structure for an exhaust system member, and more particularly to a support structure for an exhaust system member that supports an exhaust system member such as a muffler on a vehicle body via an elastic member.

  As a conventional support structure for this type of exhaust system member, one shown in FIG. 13 is known (see, for example, Patent Documents 1 and 2). In FIG. 13, the exhaust passage through which exhaust gas generated in each cylinder of the engine (not shown) passes is collected by the exhaust manifold catalytic converter 1 and sent to the sub-muffler 4 through the exhaust pipe 2 and the exhaust pipe 3.

  The exhaust gas that has passed through the sub-muffler 4 is sent to the muffler 7 through the exhaust pipe 5 and the exhaust pipe 6, and is then silenced by the muffler 7 and released into the atmosphere. In the exhaust system members such as the exhaust pipes 2, 3, 5, 6 and the sub-muffler 4 and the muffler 7, the connecting portion 8 between the exhaust manifold catalytic converter 1 and the exhaust pipe 2 and the exhaust pipe 5 and the exhaust pipe 6 are connected. The connecting portion 9 is movably connected by joint members 10a and 10b such as a ball joint and a flexible pipe joint mechanism.

  Further, as shown in FIG. 14, the muffler 7 has three support members 11a, 11b, and 11c that are movably supported on the vehicle body floor 13 via support rubbers 12a, 12b, and 12c such as support rubbers. In the state, the muffler 7 is supported by the support rubbers 12a to 12c so that no load is applied to the joint member 10a. Although not shown, the sub-muffler 4 is also movably supported by the vehicle body floor 13 by a support structure similar to the muffler 7.

  In this exhaust system member support structure, when vibration such as engine pitching occurs, vibration transmitted from the exhaust pipe 2 to the exhaust pipe 3 is transmitted to the sub-muffler 4 by deformation of the joint member 10a. Is suppressed. Further, the vibration transmitted from the exhaust pipe 5 to the exhaust pipe 6 is suppressed from being transmitted to the muffler 7 due to the deformation of the joint member 10b.

  Further, the sub-muffler 4 and the muffler 7 are supported by the support rubbers 12a to 12c at the three points below the vehicle body floor 13, and in a static state in which no stress based on engine vibration is applied to the sub-muffler 4 and the muffler 7, the joint members 10a and 10b Since the load is not applied and the joint members 10a and 10b are not elastically deformed, the load acting on the joint members 10a and 10b during the operation of the engine can only be an external input due to engine vibration. .

For this reason, the vibration absorbing function of the joint members 10a and 10b can be further exerted, and vibrations from the engine can be suppressed from being transmitted to the vehicle body under floors 10a and 10b through the sub muffler 4 and the muffler 7, It is possible to suppress the occurrence of a muffled sound in the vehicle.
JP 2000-64835 A JP 2006-152828 A

  However, in such a conventional exhaust system member support structure, since the support members 11a, 11b, and 11c are separated from the center of gravity of the muffler 7, the vehicle body under the floor via the support rubbers 12a to 12c. The vibration transmitted to 13 cannot be sufficiently suppressed.

  Specifically, as shown in FIG. 15, the joint member 10b has a swinging shaft A that swings downward, and the swinging shaft A is swung vertically as indicated by an arrow B. The vibration of the engine transmitted from the sub-muffler 4 to the muffler 7 with the swing of the swing shaft A is absorbed, and the muffler 7 is attached to the support member 11a to 11c on the vehicle body side, that is, FIG. 15 (b). As shown to (c), it rotates centering | focusing on the attachment point X of support member 11a-11c attached to support rubber | gum 12a-12c.

  However, the support members 11 a to 11 c are installed in the vehicle front-rear direction perpendicular to the central axis passing through the center of gravity G of the muffler 7, and are attached to the support rubbers 12 a to 12 c at positions away from the center of gravity G of the muffler 7. Therefore, the attachment point X of the support members 11a to 11c on the vehicle body side and the moment arms L1 and L2 at the center of gravity G of the muffler 7 become long, and the muffler is located at the attachment point A of the support members 11a to 11c on the vehicle body side. Thus, a large rotational moment M about the center of gravity G of 7 is added.

  Therefore, the vibration transmitted from the muffler 7 to the vehicle body underfloor 13 via the support rubbers 12a to 12c cannot be sufficiently suppressed, and the humming noise generated in the vehicle body cannot be suppressed.

  The present invention has been made to solve the conventional problems, and can suppress the vibration transmitted from the engine to the vehicle body via the exhaust system member, thereby suppressing the generation of a booming noise in the vehicle body. It is an object to provide a support structure for an exhaust system member.

  An exhaust system member support structure according to the present invention includes (1) an exhaust system member support structure that supports at least one exhaust system member provided in an exhaust pipe for exhausting exhaust gas from an engine to the outside. An oscillation center line capable of vertically oscillating an exhaust pipe provided at least upstream of the exhaust system with respect to the exhaust system and an exhaust pipe provided on the engine side. A joint member that is pivotably connected with respect to the center, one end portion is attached to the exhaust system member, and the other end portion is attached to an elastic member provided on the vehicle body side, and the exhaust system member is connected to the elastic member A plurality of support members supported by the vehicle body via the exhaust system member, and the exhaust system member is installed such that a center line passing through the center of gravity of the exhaust system member extends substantially parallel to a swing center line of the joint member. , Connecting the other end of the support member Substantially parallel center lines and the oscillation center line and is configured to the support member so as to be close to the center line passing through the center of gravity of the exhaust system member from those attached to the exhaust system member.

  With this configuration, when the vibration of the engine is transmitted to the exhaust system member via the exhaust pipe, the exhaust pipe provided on the upstream side of the exhaust system member in the exhaust gas discharge direction around the swing center line of the joint member As the exhaust pipe provided on the engine side swings, the vibration transmitted from the engine to the exhaust system member is absorbed by the joint member.

  At this time, the exhaust system member is installed so that the center line passing through the center of gravity of the exhaust system member extends substantially parallel to the swing center line of the joint member, and the rotation center line connecting the other end of the support member is Since the support member is attached to the elastic member so as to be close to the center line passing through the center of gravity of the exhaust system member, the exhaust system member is rotated around the other end of the support member. When rotated as a moving center, the weight balance of the exhaust system member in the front-rear direction of the vehicle can be made the same with respect to the center line passing through the center of gravity of the exhaust system member, and the exhaust system from the other end of the support member The exhaust system member can be rotated by a rotation moment with the distance to the center line passing through the center of gravity of the member as a moment arm.

  In addition, since the moment arm between the other end of the support member and the center line passing through the center of gravity of the exhaust system member can be shortened, a large rotational moment accompanying the rotation of the exhaust system member is generated at the other end of the support member. It is possible to prevent the vibration from being applied, and to suppress vibration transmitted from the engine to the vehicle body via the exhaust system member. As a result, it is possible to suppress the occurrence of a booming noise in the vehicle body.

  The exhaust system member supporting structure according to the present invention is as follows. (1) In (1), (2) the exhaust system member is constituted by a muffler, and the joint member is provided upstream of the muffler in the exhaust gas discharge direction. It is composed of things.

  Therefore, it is possible to reduce the vibration of the muffler, which is the heaviest among the exhaust system members, and can cause the generation of a humming noise caused by the vibration from the engine, and suppress the vibration transmitted from the engine to the vehicle body via the muffler. Therefore, it is possible to further suppress the occurrence of a booming noise in the vehicle body.

  In the exhaust system member support structure according to the present invention, in (1) and (2), (3) the exhaust system member is provided upstream of the muffler in the exhaust gas discharge direction, A catalytic converter for purifying, and the joint member between the exhaust pipe upstream of the exhaust gas discharge direction and the exhaust pipe of the engine side with respect to the catalytic converter, and the exhaust pipe downstream of the exhaust gas and the muffler The joint member is provided between the exhaust pipe on the upstream side and the downstream side in the exhaust gas discharge direction with respect to the catalytic converter so that the center of gravity of the exhaust pipe between the joint members is located in the catalytic converter. It is comprised from what is provided in the side.

  With this configuration, since the catalytic converter is supported on the vehicle body via the support member by the support structure similar to the muffler, vibration transmitted from the engine to the vehicle body via the muffler and the catalytic converter can be suppressed. It is possible to further suppress the generation of a booming noise.

  In addition, the muffler located at the end of the exhaust pipe is heavy, and there is no heavy object downstream of the muffler in the exhaust gas discharge direction. Therefore, the center line passing through the center of gravity of the muffler is substantially parallel to the swing center line of the joint member. However, since the catalytic converter is provided between the muffler and the engine, it is difficult to set the center of gravity on the catalytic converter.

  In the present invention, the joint member is provided upstream and downstream in the exhaust gas discharge direction with respect to the catalytic converter so that the center of gravity of the exhaust pipe between the joint members is located in the catalytic converter. It is possible to adopt a configuration in which the end is positioned on the center line passing through the center of gravity of the exhaust system member and attached to the vehicle body. For this reason, it is possible to suppress vibration transmitted from the engine to the vehicle body via the muffler and the catalytic converter, and it is possible to suppress the occurrence of a booming noise in the vehicle body.

  In the exhaust system member support structure according to the present invention, in (1) and (2), (4) the exhaust system member is provided upstream of the muffler in the exhaust gas discharge direction, and the cooling system is provided. An exhaust heat recovery device for exchanging heat with the circulating cooling water, and connecting the joint member between the exhaust pipe on the upstream side in the exhaust gas discharge direction with respect to the exhaust heat recovery device and the exhaust pipe on the engine side; Provided between the exhaust pipe on the downstream side of the exhaust gas and the exhaust pipe on the muffler side, the joint member is arranged so that the center of gravity of the exhaust pipe between the joint members is located in the exhaust heat recovery device. It is comprised from what is provided in the exhaust gas discharge direction upstream and downstream with respect to the heat recovery device.

  With this configuration, the exhaust heat recovery device is supported on the vehicle body via the support member by the support structure similar to that of the muffler, so that vibration transmitted from the engine to the vehicle body via the muffler and the exhaust heat recovery device can be suppressed. It is possible to further suppress the occurrence of a booming noise in the vehicle body.

  In addition, the muffler located at the end of the exhaust pipe is heavy, and there is no heavy object downstream of the muffler in the exhaust gas discharge direction. Therefore, the center line passing through the center of gravity of the muffler is substantially parallel to the swing center line of the joint member. However, since the exhaust heat recovery device is provided between the muffler and the engine, it is difficult to set the center of gravity on the catalytic converter.

  In the present invention, the joint member is provided upstream and downstream in the exhaust gas discharge direction with respect to the exhaust heat recovery device so that the center of gravity of the exhaust pipe between the joint members is located in the exhaust heat recovery device. A structure in which the other end of the support member is attached to the vehicle body so as to be positioned on the center line passing through the center of gravity of the exhaust system member can be adopted, and vibration transmitted from the engine to the vehicle body via the muffler and the exhaust heat recovery device It is possible to suppress the occurrence of a booming noise in the vehicle body.

  Further, in the exhaust system member support structure according to the present invention, in (1) to (4), (5) the joint member is constituted by a ball joint.

  With this configuration, the exhaust pipes can be connected to each other so as to be swingable about a swing center line that can swing in the vertical direction, and vibration transmitted from the engine to the exhaust system member can be absorbed.

  ADVANTAGE OF THE INVENTION According to this invention, the support structure of the exhaust system member which can suppress the vibration transmitted to a vehicle body via an exhaust system member from an engine, and can suppress generation | occurrence | production of a booming noise in a vehicle body is provided. it can.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an exhaust system member support structure according to the present invention will be described with reference to the drawings.
(First embodiment)
FIGS. 1-6 is a figure which shows 1st Embodiment of the support structure of the exhaust system member based on this invention.
First, the configuration will be described.

  In FIG. 1, one end of an exhaust pipe 21 that constitutes a main part of an exhaust system of a vehicle is connected to an exhaust manifold 23 of an engine 22. The exhaust manifold 23 has a passage communicating with the combustion chamber of the engine 22, and collects exhaust gas exhausted from the combustion chamber and exhausts it to the exhaust pipe 21. Note that the engine 22 of the present embodiment is a four-cylinder engine.

  The other end of the exhaust pipe 21 is disposed below the floor behind the vehicle body, and the exhaust pipe 21 extends from the engine 22 to the rear of the vehicle body.

  A catalytic converter 24 is disposed on the upstream side of the exhaust pipe 21, that is, on the engine 22 side, and the catalytic converter 24 purifies the exhaust gas. Further, a muffler 25 as an exhaust system member for reducing exhaust noise of exhaust gas is disposed on the downstream side of the exhaust pipe 21, that is, in the vicinity of the rear of the vehicle.

  Further, the exhaust pipe 21 and the muffler 25 are connected via a ball joint 26 as a joint member, and the ball joint 26 is deformed by itself so as to center on a swing center line A1 that can swing in the vertical direction. Thus, the exhaust pipe 21 and the muffler 25 are rotatably supported.

  Therefore, the exhaust pipe 21 is located on the front side of the vehicle, that is, the exhaust pipe 21a on the engine 22 side and the rear side of the vehicle, that is, on the upstream side in the exhaust gas discharge direction with respect to the muffler 25 with the ball joint 26 as a boundary. It is divided into 21b.

  FIG. 2 is a diagram showing the configuration of the ball joint 26. In FIG. 2, the ball joint 26 has a cylindrical member 27 into which the rear end portion of the exhaust pipe 21 a is fitted, and a flange 28 is provided on the outer peripheral portion of the cylindrical member 27.

  Further, the ball joint 26 has a fitting member 29a to which the tip of the exhaust pipe 21b is fitted, and a cylindrical member 29 having a curved part 29b that curves outwardly from the fitting part 29b toward the exhaust pipe 21a. A flange 30 is provided on the outer peripheral portion of the cylindrical member 29.

  Further, a seal ring 31 is provided on the inner peripheral surface of the curved portion 29b of the cylindrical member 29 so as to surround the outer peripheral surface of the exhaust pipe 21a, and the cylindrical member 27 and the cylindrical member 29 are arranged in the axial direction of the exhaust pipe 21. Opposing the seal ring 31 therebetween.

  The flange 28 and the flange 30 are connected by a bolt 33 via a coil spring 32, and the coil spring 32 is mounted in a compressed state between the flange 30 and the head of the bolt 33.

  Therefore, the flange 28 and the flange 30 are biased in the direction of sandwiching the seal ring 31 by the biasing force of the coil spring 32, and the inner peripheral surface of the curved portion 29 b of the cylindrical member 29 and the seal ring 31 are pressed against each other.

  In the ball joint 26 having such a configuration, since the outer peripheral surface of the seal ring 31 abuts on the inner peripheral surface of the curved portion 29b of the cylindrical member 29, the seal ring 31 and the inner peripheral surface of the curved portion 29b are in contact with each other. By sliding, the cylindrical member 27 and the cylindrical member 29 are relatively rotated. At this time, the ball joint 26 as a whole swings the exhaust pipe 21a and the exhaust pipe 21b by swinging in the vertical direction indicated by the arrow B1 around the swing center line A1 (see FIG. 1). Yes.

  That is, when the swing center line A1 of the ball joint 26 swings in the vertical direction, the vibration transmitted from the exhaust pipe 21a to the exhaust pipe 21b is absorbed and the vibration from the engine 22 is transmitted to the muffler 25. It comes to prevent. At this time, as the ball joint 26 swings, the exhaust pipes 21a and 21b swing around the swing center line A1, so that the catalytic converter 24 and the muffler 25 are swung.

  Further, in addition to the relative rotation of the cylindrical member 27 and the cylindrical member 29 about the swing center line A1, the seal ring 31 and the bending portion when the cylindrical member 27 and the cylindrical member 29 are relatively rotated are provided. The vibration transmitted from the engine 22 to the muffler 25 through the exhaust pipes 21a and 21b is absorbed by the friction of 29b, the elastic deformation of the seal ring 31 itself, the elastic deformation of the coil spring 32, and the like.

  On the other hand, the muffler 25 is installed such that a center line C1 passing through the center of gravity G1 extends substantially in parallel with the swing center line A1 of the ball joint 26. As shown in FIG. It is attached to a vehicle body frame 35 as a vehicle body via a muffler side support member 34 as a support member provided at both ends.

  One end 34a of the muffler-side support member 34 is fixed to the muffler 25, and the other end 34b is fitted to a support rubber 36 as an elastic member as shown in FIG. The support rubber 36 is provided with one end 37 a of a frame side support member 37 as a vehicle body, and the other end 37 b of the frame side support member 37 is fixed to the vehicle body frame 35.

  The vehicle body frame 35 includes a side member, a cross member, or a frame member provided on the side member and the cross member, and the frame side support member 37 is an arbitrary member of the side member, the cross member, or the frame member. In the position.

  Therefore, in the muffler side support member 34, the rotation center D1 connecting the other end 34b that is the mounting position on the vehicle body side is substantially parallel to the swing center line A1 of the ball joint 26 and passes through the center of gravity G1 of the muffler 25. It is attached to the muffler 25 so as to be close to the center line C1.

  Thus, since the muffler 25 is suspended from the vehicle body frame 35 via the frame side support member 37, the support rubber 36, and the muffler side support member 34, the support rubber is centered on the other end 34b of the muffler side support member 34. The rotation is allowed by 36 elastic deformations.

  The muffler 25 is a member having a large weight in the exhaust system. Since only the light tail pipe 21c is provided below the muffler 25, the muffler 25 is disposed upstream of the muffler 25 in the exhaust gas discharge direction. When the ball joint 26 is provided, the center of gravity of the exhaust system on the rear side of the vehicle with respect to the ball joint 26 can be set to the same position as the center of gravity G1 of the muffler 25.

  In the support structure of the muffler 25 having such a configuration, as shown in FIG. 4A, when vibration is transmitted from the engine 22 to the muffler 25 through the exhaust pipe 21, the tubular member 27 and the tubular member. When 29 is relatively rotated, the exhaust pipe 21a and the exhaust pipe 21b are relatively rotated.

  Actually, the ball joint 26 absorbs vibration transmitted from the exhaust pipe 21a to the exhaust pipe 21b and the vibration from the engine 22 is transmitted to the muffler 25 by swinging the swing center line A1 in the vertical direction. .

  At this time, as the exhaust pipe 21b swings, the muffler 25 rotates about the other end portion 34b of the muffler side support member 34 in the rotation direction as shown in FIGS. 4B and 4C. However, since the other end portion 34 b of the muffler side support member 34 is connected to the frame side support member 37 via the support rubber 36, the vibration of the engine 22 is transmitted to the vehicle body frame 35 via the muffler 25. Can be suppressed.

  In the present embodiment, the muffler 25 is installed so that the center line C1 passing through the center of gravity G1 of the muffler 25 extends substantially parallel to the swing center line A1 of the ball joint 26. The muffler-side support member 34 is attached to the muffler 25 so that the rotation center D connecting the end portions 34b is substantially parallel to the swing center line A1 of the ball joint 26 and close to the center line C1 passing through the center of gravity G1 of the muffler 25. Therefore, when the muffler 25 is rotated with the other end 34b of the muffler side support member 34 as the rotation center D, the weight balance of the muffler 25 in the longitudinal direction of the vehicle is the same with respect to the center line C1 passing through the center of gravity G1. Rotational moment with the distance from the other end 34b of the muffler side support member 34 to the center line C1 passing through the center of gravity G as a moment arm L4 (see FIG. 4A). Muffler 25 can be rotated.

  Further, since the moment arm L4 between the other end 34b of the muffler side support member 34 and the center line C1 passing through the center of gravity G1 of the muffler 25 can be shortened, the muffler 25 is connected to the other end 34b of the muffler side support member 34. Thus, it is possible to prevent a large rotational moment from being applied, and to suppress vibration transmitted from the engine 22 to the vehicle body frame 35 via the muffler 25. As a result, it is possible to suppress the occurrence of a booming noise in the body frame 35.

  In the present embodiment, the muffler 25 is raised sideways, that is, the longitudinal direction of the muffler 25 is set in the vehicle width direction, but the muffler 25 is raised vertically, that is, the muffler 25 as shown in FIG. The muffler 25 may be attached to the vehicle body frame 35 so that the longitudinal direction of the vehicle is the front-rear direction of the vehicle.

Even in this case, the rotation center D connecting the other end 34b of the muffler side support member 34 is substantially parallel to the swing center line A1 of the ball joint 26, and the rotation center D1 passes through the center of gravity G1 of the muffler 25. If the muffler side support member 34 is attached to the muffler 25 so as to be close to the center line C1, the muffler 25 is rotated about the rotation center D1 as shown in FIGS. Sometimes, the moment arm L4 between the other end 34b of the muffler side support member 34 and the center line C1 passing through the center of gravity G1 of the muffler 25 can be shortened.
For this reason, it is possible to prevent a large rotational moment from being applied to the other end portion 34 b of the muffler side support member 34 due to the rotation of the muffler 25, and vibration transmitted from the engine 22 to the vehicle body frame 35 via the muffler 25. Can be suppressed. As a result, it is possible to suppress the occurrence of a booming noise in the body frame 35.

  Further, in this embodiment, since the joint member is constituted by the ball joint 26, the exhaust pipes 21a and 21b are connected so as to be swingable around a swing center line A1 that can swing in the vertical direction. The vibration transmitted from the engine 22 to the muffler 25 can be absorbed.

In this embodiment, two muffler side support members 34 are provided, but one muffler side support member 34 may be provided. However, the muffler side support member 34 can be used to suppress the occurrence of a muffled noise in the vehicle body frame 35 in consideration of traveling on a rough road or when the vibration transmitted from the engine 22 is large. It is preferable to provide two or more.
(Second Embodiment)
7 to 9 are views showing a second embodiment of the exhaust system member support structure according to the present invention. In this embodiment, an exhaust heat recovery device 41 is provided between the catalytic converter 24 and the muffler 25. The example provided is shown, the same number is attached | subjected to the structure same as 1st Embodiment, and description is abbreviate | omitted.

  In FIG. 7, the engine 22 is provided with a heater hot water flow path 42 for circulating the refrigerant in the water jacket. The exhaust heat recovery device 41 is connected to one end of the heater hot water flow path 42, and the refrigerant is supplied from the engine 22. It is connected to the introduction portion 43 to be introduced and the other end portion of the heater hot water flow path 42, and includes a discharge portion 44 that discharges the refrigerant from the exhaust heat recovery device 41.

  The exhaust heat recovery device 41 is provided with a refrigerant circulation pipe 46 provided so as to surround the outer periphery of the discharge part 44, and between the inner peripheral surface of the refrigerant circulation pipe 46 and the outer peripheral surface of the exhaust pipe 45. A flow passage 47 through which the refrigerant flows is formed.

  Further, a front heater core 48 is disposed between the engine 22 and the exhaust heat recovery device 41 in the heater hot water flow path 42, and the heater hot water flow path 42 serves as a refrigerant in the direction indicated by the arrow in FIG. Hot water is flowing.

  Then, when hot hot water that has passed through the engine 22 passes through the front heater core 48, heat is exchanged and used for heating. Further, the hot water that has been cooled by heat exchange passes through the flow passage 47 of the exhaust heat recovery device 41 from the front heater core 48. When flowing, the exhaust gas is cooled by exchanging heat with the exhaust gas exhausted from the engine 22 to the exhaust pipe 45.

  In the present embodiment, ball joints 26 are provided on the front side of the vehicle body, that is, on the upstream side and the rear side in the exhaust gas discharge direction, that is, on the downstream side in the exhaust gas discharge direction, with respect to the catalytic converter 24 as the exhaust system member. In addition, a ball joint 26 is provided on the front side of the vehicle body with respect to the muffler 25, that is, on the upstream side in the exhaust gas discharge direction, so that the catalytic converter 24 is supported on the vehicle body frame 35 in addition to the muffler 25.

  In FIG. 7, the ball joint 26 has the same configuration as the ball joint 26 of the first embodiment. For convenience of explanation, a ball joint 26 is provided on the front side of the vehicle with respect to the catalytic converter 24. The joint 26A, which is provided on the rear side of the vehicle with respect to the catalytic converter 24, is referred to as a ball joint 26B, and the one provided on the front side of the vehicle with respect to the muffler 25 is described as a ball joint 26C.

  In FIG. 7, the exhaust pipe 45 is divided into exhaust pipes 45a and 45b with the ball joint 26A as a boundary, divided into exhaust pipes 45c and 45d with the ball joint 26B as a boundary, and further with the ball joint 26C as a boundary. Are divided into exhaust pipes 45e and 45f.

  Further, since the muffler 25 located at the rear end of the exhaust pipe 45 is heavy and only a light tail pipe 45g is provided on the rear side of the vehicle from the muffler 25, the center of gravity G1 is set in the muffler 25. However, since the catalytic converter 24 is provided between the muffler 25 and the engine 22, it is difficult to set the center of gravity on the catalytic converter 24.

  Therefore, in the present embodiment, the ball joints 26A, 26B are arranged such that the center of gravity G2 of the exhaust system including the exhaust pipes 45b, 45c and the catalytic converter 24 provided between the ball joints 26A, 26B is located in the catalytic converter 24. Is provided in the front-rear direction of the catalytic converter 24.

  On the other hand, the catalytic converter 24 is installed such that a center line C2 passing through the center of gravity G2 extends substantially in parallel with the swing center line A2 of the ball joints 26A and 26B. It is attached to the vehicle body frame 35 via a catalytic converter side support member 49 as a support member provided in the section.

  As shown in FIG. 8, the catalytic converter side support member 49 has one end portion 49 a fixed to the catalytic converter 24 and the other end portion 49 b fitted to the support rubber 36, whereby the frame side support member 37 is interposed. It is fixed to the body frame 35.

  Thus, since the catalytic converter 24 is suspended from the vehicle body frame 35 via the frame side support member 37, the support rubber 36, and the catalytic converter side support member 49, the other end portion 49b of the catalytic converter side support member 49 is centered. The rotation is allowed by the elastic deformation of the support rubber 36. The configuration for supporting the muffler 25 on the vehicle body frame 35 is the same as that in the first embodiment, and thus detailed description thereof is omitted.

  Further, a rotation center D2 (see FIG. 9A) connecting the other end 49b of the catalytic converter side support member 49, which is a mounting position on the vehicle body side, is substantially parallel to the swing center line A2 of the ball joints 26A and 26B. And attached to the catalytic converter 24 so as to be close to a center line C2 passing through the center of gravity G2 of the catalytic converter 24.

  In the support structure of the catalytic converter 24 having such a configuration, as shown in FIG. 9, when vibration is transmitted from the engine 22 to the catalytic converter 24 through the exhaust pipe 45a, the cylinder is centered on the swing center line A2. When the cylindrical member 27 and the cylindrical member 29 are relatively rotated, the exhaust pipe 45a and the exhaust pipe 45b are relatively rotated.

  Actually, when the swing center line A2 of the ball joint 26A swings in the vertical direction, the vibration transmitted from the exhaust pipe 45a to the exhaust pipe 45b is absorbed, and the vibration from the engine 22 is transmitted to the catalytic converter 24. To do.

  At this time, as the exhaust pipe 45a swings, the catalytic converter 24 uses the other end 49b of the catalytic converter side support member 49 as the rotation center D1, as shown in FIGS. 8B and 8C, as shown in FIGS. However, since the other end 49 b of the catalytic converter side support member 49 is connected to the frame side support member 37 via the support rubber 36, the vibration of the engine 22 is transmitted to the vehicle body frame via the catalytic converter 24. Transmission to 35 can be suppressed.

  Further, in the present embodiment, the catalytic converter 24 is installed such that the center line C2 passing through the center of gravity G2 of the catalytic converter 24 extends substantially parallel to the swing center line A2 of the ball joint 26A, and the catalytic converter side support member 49. The catalytic converter side support member is configured such that the rotation center D1 connecting the other end 49b of the 49 is substantially parallel to the swing center line A2 of the ball joint 26A and close to the center line C2 passing through the center of gravity G1 of the catalytic converter 24. 49 is attached to the catalytic converter 24. Therefore, when the catalytic converter 24 is rotated with the other end 49b of the catalytic converter side support member 49 as the rotation center D1, a center line C2 passing through the center of gravity G2 is obtained. The weight balance of the catalytic converter 24 in the longitudinal direction of the vehicle can be made the same, and the catalytic converter side support member 49 The catalytic converter 24 can be rotated a distance from the other end 49b to the center line C2 passing through the center of gravity G1 in rotation moment was moment arm L5.

  Further, since the moment arm L5 between the other end portion 49b of the catalytic converter side support member 49 and the center line C2 passing through the center of gravity G2 of the catalytic converter 24 can be shortened, the other end portion 49b of the catalytic converter side support member 49. Thus, it is possible to prevent a large rotational moment from being applied to the catalytic converter 24 and to suppress vibration transmitted from the engine 22 to the vehicle body frame 35 via the catalytic converter 24. As a result, it is possible to suppress the occurrence of a booming noise in the body frame 35.

  Further, the vibration of the engine 22 is transmitted to the muffler 25 through the exhaust pipes 45c and 45d as the catalytic converter 24 swings due to the vibration transmitted from the engine 22. At this time, the swing center line A1 of the ball joint 26C swings in the vertical direction, so that vibration transmitted from the exhaust pipe 45e to the exhaust pipe 45f is absorbed and vibration from the engine 22 is transmitted to the muffler 25. Is suppressed.

  Further, as in the first embodiment, the muffler 25 rotates with the rotation center D connecting the other end 34b of the muffler side support member 34 being substantially parallel to the swing center line A1 of the ball joint 26. Since the muffler side support member 34 is attached to the muffler 25 so that the center D1 is close to the center line C1 passing through the center of gravity G1 of the muffler 25, it is possible to generate a booming noise as in the first embodiment. Can be suppressed.

  In the present embodiment, since the catalytic converter 24 and the muffler 25 are attached to the vehicle body frame 35 via the muffler side support member 34 and the catalytic converter side support member 49, the vibration applied from the engine 22 to the catalytic converter 24 and the muffler 25. Can be reduced, and it is possible to further suppress the occurrence of a booming noise in the body frame 35.

Further, in the present embodiment, the ball joints 26A and 26B are the catalyst so that the center of gravity G2 of the exhaust system including the exhaust pipes 45b and 45c between the ball joints 26A and 26B and the catalytic converter 24 is located in the catalytic converter 24. Since it is provided in the front-rear direction of the converter 24, the center of gravity G2 can be set in the catalytic converter 24 that is lighter than the muffler 25. Therefore, the center line C2 passing through the center of gravity G2 of the catalytic converter 24 can be made parallel to the swing center line A2 of the ball joints 26A, 26B.
(Third embodiment)
10 to 12 are views showing a third embodiment of an exhaust system member support structure according to the present invention. In this embodiment, an exhaust heat recovery device 41 is provided between the catalytic converter 24 and the muffler 25. The provided example is shown, the same number is attached | subjected to the structure same as 1st and 2nd embodiment, and description is abbreviate | omitted.

  In FIG. 10, ball joints 26 are provided on the front side of the vehicle body, that is, the upstream side and the rear side in the exhaust gas discharge direction, that is, the downstream side in the exhaust gas discharge direction, with respect to the exhaust heat recovery device 41 as the exhaust system member. The ball joint 26 is provided on the front side of the vehicle body, that is, on the upstream side in the exhaust gas discharge direction with respect to the muffler 25, and the exhaust heat recovery device 41 is supported by the vehicle body frame 35 in addition to the muffler 25. ing.

  The ball joint 26 has the same configuration as that of the ball joint 26 of the first embodiment. For convenience of explanation, the ball joint 26 is provided on the front side of the vehicle with respect to the exhaust heat recovery device 41. The joint 26A, which is provided on the rear side of the vehicle with respect to the catalytic converter 24, will be described as a ball joint 26B.

  The exhaust pipe 51 is divided into exhaust pipes 51a and 51b with the ball joint 26A as a boundary, and is divided into exhaust pipes 51c and 51d with the ball joint 26B as a boundary.

  Further, since the muffler 25 located at the tail end of the exhaust pipe 51 is heavy and only a light tail pipe 51e is provided on the rear side of the vehicle from the muffler 25, the center of gravity G1 is set in the muffler 25. However, since the exhaust heat recovery device 41 is provided between the muffler 25 and the engine 22, it is difficult to set the center of gravity on the exhaust heat recovery device 41.

  Therefore, in the present embodiment, the ball is arranged such that the center of gravity G3 of the exhaust system including the exhaust pipes 51b and 51c and the exhaust heat recovery device 41 provided between the ball joints 26A and 26B is located in the exhaust heat recovery device 41. Joints 26 </ b> A and 26 </ b> B are provided in the front-rear direction of the exhaust heat recovery device 41.

  On the other hand, the exhaust heat recovery device 41 is installed such that the center line C3 passing through the center of gravity G3 extends substantially parallel to the swing center line A3 of the ball joints 26A and 26B. Are attached to the vehicle body frame 35 via exhaust heat recovery device side support members 52 as support members provided at both ends in the width direction.

  One end portion 52a of the exhaust heat recovery device support member 52 is fixed to the exhaust heat recovery device 41, and the other end portion 52b is fitted to the support rubber 36 as shown in FIG. It is fixed to the vehicle body frame 35 via 37.

  Further, the rotation center D3 (see FIG. 12A) connecting the other end 52b of the exhaust heat recovery device support member 52, which is the mounting position on the vehicle body side, is substantially the same as the swing centerline A3 of the ball joints 26A and 26B. The exhaust heat recovery device 41 is attached to the exhaust heat recovery device 41 so as to be parallel and close to a center line C3 passing through the center of gravity G3 of the exhaust heat recovery device 41.

  Thus, the exhaust heat recovery device 41 is suspended from the vehicle body frame 35 via the frame side support member 37, the support rubber 36, and the exhaust heat recovery device side support member 51. Rotation is allowed by the elastic deformation of the support rubber 36 around the other end 51b. The configuration for supporting the muffler 25 on the vehicle body frame 35 is the same as that in the first embodiment, and thus detailed description thereof is omitted.

  In the support structure of the exhaust heat recovery apparatus 41 having such a configuration, when vibration is transmitted from the engine 22 to the exhaust heat recovery apparatus 41 through the exhaust pipe 51a as shown in FIG. 12, the oscillation center line A3 The tubular member 27 and the tubular member 29 are rotated relative to each other, whereby the exhaust pipe 51a and the exhaust pipe 51b are relatively rotated.

  Actually, when the swing center line A3 of the ball joint 26A swings in the vertical direction, the vibration transmitted from the exhaust pipe 51a to the exhaust pipe 51b is absorbed, and the vibration from the engine 22 is absorbed by the exhaust heat recovery device 41. Communicate.

  At this time, as shown in FIGS. 12B and 12C, the exhaust heat recovery device 41 uses the other end 52b of the exhaust heat recovery device side support member 52 as the rotation center D3 by the swing of the exhaust pipe 51a, as shown in FIGS. The other end portion 52b of the exhaust heat recovery device side support member 52 is connected to the frame side support member 37 via the support rubber 36, so that the vibration of the engine 22 is caused by exhaust heat. Transmission to the vehicle body frame 35 via the collection device 41 can be suppressed.

  In the present embodiment, the exhaust heat recovery device 41 is installed so that the center line C3 passing through the center of gravity G3 of the exhaust heat recovery device 41 extends substantially parallel to the swing center line A3 of the ball joint 26A. The rotation center D3 connecting the other end 51b of the apparatus side support member 51 is substantially parallel to the swing center line A3 of the ball joint 26A and close to the center line C3 passing through the center of gravity G3 of the exhaust heat recovery apparatus 41. Since the exhaust heat recovery device side support member 52 is attached to the exhaust heat recovery device 41, when the exhaust heat recovery device 41 is rotated about the other end 52b of the exhaust heat recovery device side support member 52 as the rotation center D3. The weight balance of the exhaust heat recovery device 41 in the longitudinal direction of the vehicle can be made the same with respect to the center line C3 passing through the center of gravity G3, and passes through the center of gravity G3 from the other end 34b of the muffler side support member 34. An exhaust heat recovery device 41 the distance to the center line C3 in rotation moment was moment arm L6 can be rotated.

  Further, since the moment arm L6 between the other end 52b of the exhaust heat recovery device side support member 52 and the center line C3 passing through the center of gravity G3 of the exhaust heat recovery device 41 can be shortened, the exhaust heat recovery device support member 52 is provided. It is possible to prevent a large rotational moment due to the rotation of the exhaust heat recovery device 41 from being applied to the other end 52b of the engine, and to suppress vibration transmitted from the engine 22 to the vehicle body frame 35 via the exhaust heat recovery device 41. can do. As a result, it is possible to suppress the occurrence of a booming noise in the body frame 35.

  Further, the vibration of the engine 22 is transmitted to the muffler 25 through the exhaust pipes 51 c and 51 as the exhaust heat recovery device 41 swings due to the vibration transmitted from the engine 22. At this time, the swing centerline A1 of the ball joint 26B swings in the vertical direction, so that vibration transmitted from the exhaust pipe 51c to the exhaust pipe 51d is absorbed and vibration from the engine 22 is transmitted to the muffler 25. Is suppressed.

  Further, as in the first embodiment, the muffler 25 rotates with the rotation center D1 connecting the other end 34b of the muffler-side support member 34 being substantially parallel to the swing center line A1 of the ball joint 26. Since the muffler side support member 34 is attached to the muffler 25 so that the center D1 is close to the center line C1 passing through the center of gravity G1 of the muffler 25, it is possible to generate a booming noise as in the first embodiment. Can be suppressed.

  In the present embodiment, the exhaust heat recovery device 41 and the muffler 25 are attached to the vehicle body frame 35 via the muffler side support member 34 and the exhaust heat recovery device side support member 52. Vibration applied to the muffler 25 can be reduced, and generation of a muffled noise in the vehicle body frame 35 can be further suppressed.

  In the present embodiment, the ball joint 26A is arranged so that the center of gravity G3 of the exhaust system including the exhaust pipes 51b and 51c between the ball joints 26A and 26B and the exhaust heat recovery device 41 is located in the exhaust heat recovery device 41. , 26B are provided in the front-rear direction of the exhaust heat recovery device 41, the center of gravity G3 can be set in the exhaust heat recovery device 41 that is lighter than the muffler 25. Therefore, the center line C3 passing through the center of gravity G3 of the exhaust heat recovery apparatus can be parallel to the swing center line A3 of the ball joints 26A and 26B.

Even in the second and third embodiments, the muffler 25 is raised sideways, that is, the longitudinal direction of the muffler 25 is set to the width direction of the vehicle, but as in the first embodiment. The muffler 25 may be attached to the vehicle body frame 35 by raising the muffler 25 vertically, that is, with the longitudinal direction of the muffler 25 being the longitudinal direction of the vehicle.
Further, when a sub-muffler as an exhaust system member that is lighter than the muffler 25 is provided upstream of the muffler 25 in the exhaust gas discharge direction, the sub-muffler is provided with the catalytic converter 24 and the exhaust heat recovery device 41 as described above. Is provided in the front-rear direction of the sub-muffler with the same configuration as that supported by the ball joint 26, and the sub-muffler may be supported on the vehicle body frame 35 via the support rubber 36 with the same configuration as the muffler-side support member 34.

  In addition, the embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the support structure for an exhaust system member according to the present invention can suppress vibration transmitted from the engine to the vehicle body via the exhaust system member, thereby suppressing the occurrence of a humming noise in the vehicle body. It is useful as a support structure for an exhaust system member that supports an exhaust system member such as a muffler on a vehicle body via an elastic member.

It is a figure which shows 1st Embodiment of the support structure of the exhaust system member which concerns on this invention, (a) is a block diagram which shows the exhaust pipe structure of the vehicle-mounted engine provided with the support structure of an exhaust system member, b) is a view in the YY direction arrow of FIG. It is sectional drawing of the ball joint of 1st Embodiment of the support structure of the exhaust system member which concerns on this invention. It is a figure which shows the structure of the muffler side support member of 1st Embodiment of the support structure of the exhaust system member which concerns on this invention, support rubber | gum, and the frame side support member, (a) is the perspective view, (b) is It is the side view. It is a figure explaining a behavior of a muffler when vibration from an engine of a 1st embodiment of an exhaust system member support structure concerning the present invention is transmitted to a muffler. It is a figure which shows 1st Embodiment of the support structure of the exhaust system member which concerns on this invention, (a) is a block diagram which shows the exhaust pipe structure of the other structure of the vehicle-mounted engine provided with the support structure of the exhaust system member (B) is a YY direction arrow view of the same figure (a). It is a figure explaining the behavior of a muffler when the vibration from an engine is transmitted to a muffler in the exhaust pipe structure of other composition of a 1st embodiment of a support structure of an exhaust system member concerning the present invention. It is a figure which shows 2nd Embodiment of the support structure of the exhaust system member which concerns on this invention, and is a block diagram which shows the exhaust pipe structure of the vehicle-mounted engine provided with the support structure of the exhaust system member. It is a figure which shows the structure of the catalytic converter side support member, support rubber | gum, and frame side support member of 2nd Embodiment of the support structure of the exhaust system member which concerns on this invention, (a) is the perspective view, (b) Is a side view thereof. It is a figure explaining the behavior of a catalytic converter when the vibration from the engine of 2nd Embodiment of the support structure of the exhaust system member which concerns on this invention is transmitted to a catalytic converter. It is a figure which shows 3rd Embodiment of the support structure of the exhaust system member which concerns on this invention, and is a block diagram which shows the exhaust pipe structure of the vehicle-mounted engine provided with the support structure of the exhaust system member. It is a figure which shows the structure of the exhaust heat recovery apparatus side support member, support rubber | gum, and frame side support member of 3rd Embodiment of the support structure of the exhaust system member which concerns on this invention, (a) is the perspective view, ( b) is a side view thereof. It is a figure explaining the behavior of an exhaust-heat-recovery apparatus when the vibration from the engine of 3rd Embodiment of the support structure of the exhaust-system member which concerns on this invention is transmitted to an exhaust-heat recovery apparatus. It is a block diagram which shows the exhaust pipe structure of the vehicle-mounted engine provided with the support structure of the conventional exhaust system member. It is a figure which shows the positional relationship of the support member and support rubber which were provided in the conventional exhaust system member. It is a figure explaining the behavior of an exhaust heat recovery device when vibration from an engine is transmitted to an exhaust heat recovery device.

Explanation of symbols

21 Exhaust pipe 22 Engine 24 Catalytic converter (exhaust system member)
25 Muffler (Exhaust system member)
26 Ball joint (joint member)
26A-26C Ball joint (joint member)
34 Muffler support member (support member)
34a One end portion of the muffler side support member 34b Other end portion of the muffler side support member 35 Body frame (vehicle body)
36 Support rubber (elastic member)
37 Frame side support member (vehicle body)
41 Exhaust heat recovery device (exhaust system member)
45 Exhaust pipe 49 Catalytic converter side support member (support member)
49a One end portion of the catalytic converter side support member 49b Other end portion of the catalytic converter side support member 51 Exhaust pipe 52 Exhaust heat recovery device side support member (support member)
52a One end portion of the exhaust heat recovery device side support member 52b The other end portion of the exhaust heat recovery device side support member A1 to A3 Oscillation center line C1 to C3 Center lines D1 to D3 center of rotation G1 to G3 G1 to G3 Center of gravity

Claims (5)

An exhaust system member support structure for supporting at least one exhaust system member provided on an exhaust pipe for exhausting exhaust gas from an engine to the outside, on a vehicle body,
With respect to the exhaust system member, at least an exhaust pipe provided on the upstream side in the exhaust direction of the exhaust gas and an exhaust pipe provided on the engine side about a swing center line that can swing in the vertical direction. A coupling member swingably connected;
A plurality of support members, one end of which is attached to the exhaust system member, the other end of which is attached to an elastic member provided on the vehicle body side, and which supports the exhaust system member on the vehicle body via the elastic member. ,
Installing the exhaust system member such that a center line passing through the center of gravity of the exhaust system member extends substantially parallel to a swing center line of the joint member;
The support member is attached to the exhaust system member so that a rotation center line connecting the other end portions of the support member is substantially parallel to the swing center line and close to a center line passing through the center of gravity of the exhaust system member. A structure for supporting an exhaust system member. The exhaust system member support structure according to claim 1, wherein the exhaust system member is constituted by a muffler, and the joint member is provided upstream of the muffler in the exhaust gas discharge direction. The exhaust system member is provided upstream of the muffler in the exhaust gas discharge direction, and has a catalytic converter that purifies the exhaust gas,
The joint member is provided between the exhaust pipe on the upstream side in the exhaust gas discharge direction with respect to the catalytic converter and the exhaust pipe on the engine side, and between the exhaust pipe on the downstream side of the exhaust gas and the exhaust pipe on the muffler side. ,
The joint member is provided upstream and downstream in the exhaust gas discharge direction with respect to the catalytic converter so that the center of gravity of the exhaust pipe between the joint members is located in the catalytic converter. The support structure for an exhaust system member according to claim 1 or 2. The exhaust system member has an exhaust heat recovery device that is provided upstream of the muffler in the exhaust gas discharge direction and performs heat exchange with cooling water circulating in the cooling system,
The joint member is connected to the exhaust heat recovery device between the exhaust pipe on the upstream side in the exhaust gas discharge direction and the exhaust pipe on the engine side, and between the exhaust pipe on the downstream side of the exhaust gas and the exhaust pipe on the muffler side. Provided in
The joint member is provided upstream and downstream in the exhaust gas discharge direction with respect to the exhaust heat recovery device such that the center of gravity of the exhaust pipe between the joint members is located in the exhaust heat recovery device. The support structure for an exhaust system member according to claim 1 or 2. The exhaust system member support structure according to any one of claims 1 to 4, wherein the joint member includes a ball joint.

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