JP2019056306A - Exhaust system component support rod - Google Patents

Abstract

To provide a structure which can suppress a stress concentration at a rod aggregation part, in an exhaust system component support rod to which three pieces of rod members are integrally welded.SOLUTION: In an exhaust system support rod 1 having a second rod member 12 having a horizontal part 12a which is welded to one side of a second horizontal part 11b of a first rod member 11, and a third rod member 13 having a first horizontal part 13a which is welded to the other side of the second horizontal part 11b of the first rod member 11, a tip position of the horizontal part 12a of the second rod member 12 and a tip position of the first horizontal part 13a of the third rod member 13 are set in positions which are displaced from each other in an extension direction of the second horizontal part 11b of the first rod member 11. By this constitution, it can be suppressed that stress is concentrated to a part of the rod aggregation part 14 in which the horizontal parts 11b, 12a and 13a of the rod members 11, 12 and 13 are welded to one another, and support rigidity to an exhaust system component can be sufficiently secured.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an exhaust system component support rod for supporting an exhaust system component provided in an exhaust system of an automobile engine with respect to a vehicle body.

  Conventionally, as disclosed in Patent Document 1 and Patent Document 2, an exhaust system component (a muffler, a catalyst device, or the like) provided in an exhaust system of an automobile engine is mounted on a vehicle body (via a plurality of support rods and support rubbers). A structure that is elastically supported on a floor panel or a body frame has been proposed.

  Specifically, the vehicle body side support rod extended from the vehicle body and the exhaust system component support rod extended from the exhaust system component are inserted into the respective insertion holes formed in the support rubber, thereby exhausting the exhaust. System parts are elastically supported with respect to the vehicle body.

  Further, there is a structure in which three rod members are integrally welded as the exhaust system component support rod. FIG. 4 is a perspective view of an exhaust system component support rod according to the prior art. As shown in FIG. 4, this type of exhaust system component support rod includes a first rod member a inserted into a support rubber insertion hole (not shown), and a second rod member welded to the first rod member a. b and a third rod member c are provided. Specifically, each of the rod members a, b, c includes horizontal portions a1, b1, c1 that are parallel to each other (for example, extend along the longitudinal direction of the vehicle body), and the horizontal portion of the first rod member a. The horizontal portion b1 of the second rod member b is on one side (front side in the drawing) of a1, and the third rod member c is horizontally on the other side (back side in the drawing) of the horizontal portion a1 of the first rod member a. Each part c1 is welded. The first rod member a includes an insertion portion a2 bent from one end side of the horizontal portion a1, and the insertion portion a2 is inserted into the insertion hole of the support rubber. Each rod member a, b, c is provided with joint portions a3, b3, c3 bent from the other end side of the horizontal portions a1, b1, c1, and these joint portions a3, b3, c3 are exhaust systems. Joined (welded) to the part.

JP 2012-154258 A JP 2010-163987 A

  However, in the exhaust system component support rod in which the three rod members a, b, and c are integrally welded, the vertical force (on the vertical direction) is applied to the first rod member a due to the vibration of the vehicle body or the like. When the arrows f1 and f2 in the figure are input, this force acts on the welded portion (the rod assembly where the horizontal portions a1, b1 and c1 of the rod members a, b and c are welded together). As a result of stress concentration, it has been difficult to ensure sufficient support strength for exhaust system components.

  The inventors of the present invention, in the rod assembly portion of the conventional exhaust system component support rod, the tip position of the horizontal portion b1 of the second rod member b and the tip position of the horizontal portion c1 of the third rod member c Has coincided in the extending direction of the horizontal portion a1 of the first rod member a, and thus new knowledge has been obtained that the above-described stress concentration occurs at the tip portion of the rod assembly portion.

  The present invention has been made in view of this point, and an object of the present invention is to suppress stress concentration at the rod assembly portion in an exhaust system component support rod in which three rod members are integrally welded. It is to provide a structure that can be done.

  In order to achieve the above object, the solution means of the present invention includes a first rod member having a horizontal portion connected to a vehicle body via a support rubber and extending in a substantially horizontal direction, and the first rod member A second rod member having a horizontal portion that extends parallel to the horizontal portion and is welded to one side in a direction perpendicular to the extending direction with respect to the horizontal portion; and parallel to the horizontal portion of the first rod member An exhaust system component support rod provided with a third rod member that extends and is welded to the other side in the direction orthogonal to the extending direction with respect to the horizontal portion is assumed. And this exhaust system component support rod is the tip position in the extending direction in each of the horizontal portion of the second rod member and the horizontal portion of the third rod member welded to the horizontal portion of the first rod member. Are set at positions shifted from each other in the extending direction of the horizontal portion of the first rod member.

  Due to this specific matter, when a vertical force is input to the first rod member due to vibration of the vehicle body or the like, this force is applied to the welded portion (the rod assembly where the horizontal portions of the rod members are welded together). In this solution, the tip position of the horizontal portion of the second rod member and the tip position of the horizontal portion of the third rod member are shifted from each other in the extending direction of the horizontal portion of the first rod member. By setting the position, it is possible to suppress the stress from being dispersed and the stress from being concentrated on a part of the rod assembly portion.

  In the present invention, a second rod member having a horizontal portion welded to one side of the horizontal portion of the first rod member, and a third rod member having a horizontal portion welded to the other side of the horizontal portion of the first rod member. And the tip position of the horizontal portion of the second rod member and the tip position of the horizontal portion of the third rod member are shifted from each other in the extending direction of the horizontal portion of the first rod member. The position is set. Thereby, it can suppress that stress concentrates on a part of rod assembly part where the horizontal parts of each rod member were welded, and it becomes possible to ensure sufficient support strength with respect to exhaust system components.

It is a side view which shows the muffler support part periphery in embodiment. It is a perspective view which shows the exhaust system component support rod which concerns on embodiment. It is a perspective view which shows the exhaust system component support rod which concerns on a modification. It is a perspective view which shows the exhaust system component support rod which concerns on a prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment demonstrates the case where this invention is applied to the exhaust system component support rod for supporting the muffler as an exhaust system component to a vehicle body. In the present embodiment, the exhaust system according to the present invention is arranged with respect to the front end portion of the muffler as an arrangement form of the muffler so that the axial center direction thereof substantially coincides with the longitudinal direction of the vehicle body. A case where the component support rod is applied will be described. Not only this but the exhaust system component support rod which concerns on this invention is also applicable to the rear-end part of a muffler. The present invention can also be applied to an exhaust system component support rod for supporting a muffler disposed on the vehicle body so that the axial direction substantially coincides with the vehicle width direction.

-Outline structure of muffler support-
FIG. 1 is a side view showing the periphery of a muffler support part in the present embodiment. FIG. 2 is a perspective view showing the exhaust system component support rod 1 according to the present embodiment.

  An exhaust pipe 21 is connected to the front end surface of the muffler 2 formed in a substantially cylindrical shape, and the exhaust system component support rod 1 is integrally joined by means such as welding. On the other hand, a vehicle body side support rod 4 is attached to a portion of the lower surface of the vehicle body floor 3 facing the position where the exhaust system component support rod 1 is disposed by means such as welding or bolting.

  A support rubber 5 is stretched between the exhaust system component support rod 1 and the vehicle body side support rod 4. As a result, the muffler 2 is elastically supported in a state where the muffler 2 is suspended below the vehicle body floor 3. That is, the support rubber 5 is formed with a muffler side insertion hole 51 and a vehicle body side insertion hole 52 penetrating in the thickness direction (horizontal direction). Specifically, the muffler 2 is elastically supported by the first rod member 11) described later by inserting the vehicle body side support rods 4 into the vehicle body side insertion holes 52. Hereinafter, the structures of the support rods 1 and 4 and the support rubber 5 will be specifically described.

-Body support rod-
The vehicle body side support rod 4 is formed by bending a solid or hollow metal shaft. Specifically, the vehicle body side support rod 4 includes a vertical portion 41 extending substantially along the vertical direction, and a vehicle body of the support rubber 5 extending horizontally from the lower end of the vertical portion 41 along the vehicle width direction. And a horizontal portion 42 to be inserted into the side insertion hole 52.

  The upper end of the vertical portion 41 is attached to the vehicle body floor 3 by means such as welding or bolting. Further, a large portion for preventing the support rubber 5 from dropping from the vehicle body side support rod 4 in a state where the horizontal portion 42 is inserted into the vehicle body side insertion hole 52 of the support rubber 5 is provided at the tip of the horizontal portion 42. A diameter portion (not shown) is integrally formed. The outer diameter of the large diameter portion is set to be slightly larger than the inner diameter of the vehicle body side insertion hole 52 of the support rubber 5.

−Exhaust system parts support rod−
The feature of this embodiment resides in the exhaust system component support rod 1. The exhaust system component support rod 1 includes a first rod member 11 inserted into the muffler side insertion hole 51 of the support rubber 5, a second rod member 12 and a third rod member 13 welded to the first rod member 11, respectively. It has. Each rod member 11, 12, 13 is formed by bending a solid or hollow metal shaft.

  Specifically, the first rod member 11 includes a first horizontal portion 11a that is inserted into the muffler side insertion hole 51 of the support rubber 5 and extends in the vehicle width direction, and a muffler from one end of the first horizontal portion 11a. A second horizontal portion 11b extending in the substantially horizontal direction toward the second side, and a third horizontal portion 11c extending in the vehicle width direction from one end of the second horizontal portion 11b (one end on the muffler 2 side); It has. At the tip of the first horizontal portion 11a, there is a large amount for preventing the muffler 2 from dropping from the support rubber 5 in a state where the first horizontal portion 11a is inserted into the muffler side insertion hole 51 of the support rubber 5. The diameter portion 11d is integrally formed. The outer diameter of the large diameter portion 11d is set to be slightly larger than the inner diameter of the muffler side insertion hole 51 of the support rubber 5.

  The second rod member 12 extends in parallel with the second horizontal portion 11b of the first rod member 11 and is on one side in the direction perpendicular to the extending direction with respect to the second horizontal portion 11b (in FIG. 2). A horizontal portion 12a welded to the front side and a vertical portion 12b extending downward from one end of the horizontal portion 12a (one end on the muffler 2 side) are provided. B1 in the drawing is a weld bead between the second horizontal portion 11b of the first rod member 11 and the horizontal portion 12a of the second rod member 12.

  The third rod member 13 extends in parallel with the second horizontal portion 11b of the first rod member 11 and is on the other side in the direction perpendicular to the extending direction with respect to the second horizontal portion 11b (in FIG. 2). A first horizontal portion 13a welded to the back side and a second horizontal portion 13b extending from one end of the first horizontal portion 13a (one end on the muffler 2 side) along the vehicle width direction are provided. B2 in the drawing is a weld bead between the second horizontal portion 11b of the first rod member 11 and the first horizontal portion 13a of the third rod member 13.

  Thus, in the exhaust system component support rod 1 according to the present embodiment, the second horizontal portion 11b of the first rod member 11, the horizontal portion 12a of the second rod member 12, and the third rod member 13 are used. The first horizontal portion 13a has a rod assembly portion 14 that is integrally welded.

  As a feature of the present embodiment, the tip position of the horizontal portion 12a of the second rod member 12 (tip position of the first rod member 11 on the first horizontal portion 11a side; tip position on the side opposite to the muffler 2 side) The tip position of the first horizontal portion 13a of the third rod member 13 (also the tip position of the first rod member 11 on the first horizontal portion 11a side) is the extending direction of the second horizontal portion 11b of the first rod member 11. Are set at positions shifted from each other.

  Specifically, with respect to the tip position of the first horizontal portion 13a of the third rod member 13, the tip position of the horizontal portion 12a of the second rod member 12 is first by a predetermined dimension (dimension L1 in FIG. 2). The position of the rod member 11 is set closer to the first horizontal portion 11a.

  The distance between the tip position of the horizontal portion 12a of the second rod member 12 and the tip position of the first horizontal portion 13a of the third rod member 13 (in the extending direction of the second horizontal portion 11b of the first rod member 11). The distance in the direction along the line; the dimension L1 in FIG. 2 is the input point (point Fi in FIG. 2) when the vertical force is input to the first rod member 11 due to the vibration of the vehicle body and the like. The distance (L2 in FIG. 2) between the tip position of the horizontal portion 12a of the two rod member 12 and the distance (L2 in FIG. 2) between the input point Fi and the tip position of the first horizontal portion 13a of the third rod member 13. 2 is set to be equal (L2 = L3). The input point Fi is a position where the support rubber 5 is disposed on the first horizontal portion 11 a of the first rod member 11. For example, it is a position corresponding to the central portion in the thickness direction of the support rubber 5.

  In the present embodiment, the length dimension of the horizontal portion 12a of the second rod member 12 and the length dimension of the first horizontal portion 13a of the third rod member 13 are substantially equal. These dimensions may be different from each other. Further, the length dimension of the weld bead B1 between the second horizontal portion 11b of the first rod member 11 and the horizontal portion 12a of the second rod member 12, the second horizontal portion 11b of the first rod member 11 and the third length. The length of the weld bead B2 between the rod member 13 and the first horizontal portion 13a is also substantially equal. These dimensions may also be different from each other.

-Support rubber-
The support rubber 5 is formed of a substantially elliptical plate-like member made of an elastic body such as silicon rubber or EPDM. As the constituent material of the support rubber 5, various rubber materials can be applied. As described above, the support rubber 5 includes a muffler side insertion hole 51 into which the first horizontal portion 11a of the first rod member 11 of the exhaust system component support rod 1 is inserted, and a horizontal position of the vehicle body side support rod 4. A vehicle body side insertion hole 52 into which the portion 42 is inserted is formed penetrating in the thickness direction.

  The muffler side insertion hole 51 and the vehicle body side insertion hole 52 are formed on both sides in the longitudinal direction of the support rubber 5 (the major axis direction of the ellipse: the vertical direction in FIG. 1).

-When vertical force is applied-
When a vertical force is input to the first rod member 11 due to vibration of the vehicle body or the like, this force acts on the rod assembly portion 14. At this time, in this embodiment, the tip position of the horizontal portion 12 a of the second rod member 12 and the tip position of the first horizontal portion 13 a of the third rod member 13 are the extension of the second horizontal portion 11 b of the first rod member 11. The stress is dispersed by being set at positions shifted from each other in the present direction, and it is possible to suppress the stress from being concentrated on a part of the rod assembly portion 14. For this reason, it becomes possible to ensure sufficient support strength with respect to the muffler 2.

  In particular, in the present embodiment, as described above, the distance L2 between the force input point Fi for the first rod member 11 and the tip position of the horizontal portion 12a of the second rod member 12, the input point Fi and the first point. By equalizing the distance L3 between the tip positions of the first horizontal portions 13a of the three rod members 13, it is possible to equalize the stress acting on each tip position. Thereby, stress can be disperse | distributed effectively and the suppression effect of the stress concentration mentioned above can be heightened.

(Modification)
Next, a modified example will be described. In the embodiment described above, the tip position of the horizontal portion 12a of the second rod member 12 is higher than the tip position of the first horizontal portion 13a of the third rod member 13 in the first horizontal portion 11a of the first rod member 11. It was set at a close position.

  Instead of this, in the present modification, the tip position of the first horizontal portion 13a of the third rod member 13 is first relative to the tip position of the horizontal portion 12a of the second rod member 12, as shown in FIG. The rod member 11 is set at a position near the first horizontal portion 11a.

  Also according to this modification, as in the case of the above-described embodiment, it is possible to prevent stress from being concentrated on a part of the rod assembly portion 14, and to sufficiently secure the support strength for the muffler 2. Become.

-Other embodiments-
The present invention is not limited to the above-described embodiment and the above-described modifications, and all modifications and applications encompassed within the scope of the claims and the scope equivalent to the scope are possible.

  For example, in the embodiment and the modification, the case where the present invention is applied to the exhaust system component support rod 1 for supporting the muffler 2 on the vehicle body has been described. The present invention is not limited to this, and can also be applied to an exhaust system component support rod for supporting the catalyst device and the exhaust pipe on the vehicle body.

  In the embodiment and the modification, the exhaust system component support rod 1 is configured by only the three rod members 11, 12, and 13. The present invention is not limited to this, and can also be applied to the case where the exhaust system component support rod is constituted by four or more rod members. In this case, the present invention is applied to the rod assembly portion of at least three rod members.

  The present invention is applicable to an exhaust system component support rod for supporting an exhaust system component such as a muffler provided in an exhaust system of an automobile engine with respect to a vehicle body.

DESCRIPTION OF SYMBOLS 1 Exhaust system component support rod 11 1st rod member 11b 2nd horizontal part (horizontal part)
12 Second rod member 12a Horizontal portion 13 Third rod member 13a First horizontal portion (horizontal portion)
14 Rod assembly 2 Muffler (exhaust system parts)
3 Body floor 5 Support rubber

Claims (1)

A first rod member connected to the vehicle body via a support rubber and having a horizontal portion extending in a substantially horizontal direction, extending parallel to the horizontal portion of the first rod member and extending to the horizontal portion. A second rod member having a horizontal portion welded to one side in a direction orthogonal to the direction of extension; and extending parallel to the horizontal portion of the first rod member and orthogonal to the extension direction of the horizontal portion. In an exhaust system component support rod comprising a third rod member having a horizontal portion welded to the other side of the direction,
The leading end position in the extending direction of each of the horizontal portion of the second rod member and the horizontal portion of the third rod member welded to the horizontal portion of the first rod member is the horizontal position of the first rod member. An exhaust system parts support rod characterized by being set at positions shifted from each other in the extending direction of the part.

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