JP6929609B2 - Exhaust pipe holding structure - Google Patents

Description

The present invention relates to an exhaust pipe holding structure.

In a structure in which the exhaust pipe is held on the body of an automobile, it may be necessary to hold the exhaust pipe near the fuel tank in the center of the vehicle. Conventionally, in a vehicle having such a structure, a hanger for holding the exhaust pipe is arranged on the body side, and extends from the exhaust pipe side via a thick rubber member (hanger rubber) having two through holes at the top and bottom. Combined with a hanger, the exhaust pipe is held by the body. The hanger on the body side is generally connected to the rear surface of the front floor panel RR or to the side member to ensure rigidity. When the hanger on the body side is connected to the side member, the hanger is extended in the vehicle width direction with respect to the side surface of the side member, and the attachment portion to the side member is formed in the vertical direction (for example, Patent Document). 1).

Japanese Patent No. 3107083

By the way, the vehicle body vibration during vehicle running and the exhaust vibration from the exhaust pipe are transmitted to the tip of the hanger for holding the exhaust pipe. In order to reduce the vibration from the exhaust pipe to the body, it is necessary to secure the rigidity of the hanger mounting portion, but there are the following problems. Since the hanger is connected to a part with insufficient rigidity (floor panel: t0.8), it is necessary to add a large bracket and a hanger as a splint to ensure the rigidity. However, in a 2WD vehicle or the like, since the hanger mounting portion is in an area where it is crushed by a side collision, it is difficult to achieve both collision safety performance and ensuring rigidity. Further, the coupling position with the exhaust pipe is far, and it is necessary to extend the hanger for a long time. The longer the hanger length, the larger the offset from the coupling position and the lower the support rigidity. If the hanger is oriented in the direction of the fuel tank, the orientation of the hanger may be restricted because the fuel tank may be torn in the event of a collision.

The present invention solves the above-mentioned problems, makes it possible to secure the strength of the mounting portion while achieving both collision safety performance, reduce vibration from the exhaust pipe applied to the hanger portion, and thus reduce noise. It is an object of the present invention to provide a pipe holding structure.

In order to achieve the above object, the exhaust pipe holding structure of the present invention is an exhaust pipe holding structure in which a rod-shaped hanger portion is extended in the vehicle width direction with respect to the side member side surface of the vehicle, and the hanger portion is a bracket. A part of the bracket is fixed to the side member side surface, and the portion not fixed to the side member side surface is bent and extends in the vehicle width direction, and the bracket is folded back to the side member. The fixed axis direction, in which the hanger portion is fixed to the side member side surface by being connected to the kick-up portion of the joint surface with the floor in a two-sided manner, is from the vertical axis when the side member side surface is viewed from the vehicle side. It is characterized by having an angle.

According to the present invention, it is possible to provide an exhaust pipe holding structure capable of ensuring the strength of the mounting portion while achieving both collision safety performance, reducing vibration from the exhaust pipe applied to the hanger portion, and thus reducing noise. Can be done.

FIG. 1 is a perspective view showing an example of an embodiment of the exhaust pipe holding structure of the present invention. FIG. 2 is a perspective view showing an example of a conventional holding structure of an exhaust pipe. FIG. 3 is a side view of an example of the embodiment of the exhaust pipe holding structure of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to and limited to the following examples. The drawings referred to below are schematically described, and the dimensional ratio of the object drawn in the drawing may be different from the dimensional ratio of the actual object. The dimensional ratios of objects may differ between the drawings.

FIG. 1 is a perspective view showing an example of an embodiment of the exhaust pipe holding structure of the present invention. FIG. 3 is a side view of the exhaust pipe holding structure. In the exhaust pipe holding structure of the present embodiment, a rod-shaped hanger portion 1 for holding the exhaust pipe is arranged on the side surface of the side member 3 of the vehicle via the hanger mounting portion (bracket) 2. The hanger mounting portion 2 is welded to the side surface of the side member 3 and mounted. In the present embodiment, the hanger portion 1 is arranged on the side surface of the side member 3 of the vehicle via the hanger mounting portion (bracket) 2, but the present invention is not limited to this, and the hanger portion 1 is directly connected to the side member. 3 It may be attached to the side surface.

A part of the hanger portion 1 is fixed to the side surface of the side member 3 (via the hanger mounting portion 2), and the portion not fixed to the side surface of the side member 3 is bent and extends in the vehicle width direction. The fixed shaft L direction in which the hanger portion 1 is fixed to the side surface of the side member 3 has an angle with respect to the vertical direction. Here, the fixed shaft L direction of the hanger portion 1 refers to the length direction of the rod-shaped hanger portion 1 of the portion attached to the side surface of the side member 3 (via the hanger mounting portion 2). The vertical direction is the vertical axis direction of the vehicle.

For comparison, FIG. 2 shows a perspective view showing an example of a conventional exhaust pipe holding structure. In the conventional structure, the hanger 11 is welded and attached to the rear surface of the RR of the Fr floor panel 4, and the hanger 11 is attached in the vertical direction. Assuming that the upper and lower inputs are 1, the force applied to the hanger in such a holding structure is 1 in the welding axis (fixed axis) direction of the mounting portion and 0 in the welding orthogonal direction. Assuming that the front and rear inputs are 1, a force of 0 acts in the welding axis direction of the mounting portion and 1 in the welding orthogonal direction. Therefore, a maximum force of 1 in the welding axis direction and 1 in the welding orthogonal direction acts on the welded portion at the maximum. In this case, the reduction of vibration from the exhaust pipe to the body depends on the rigidity of bending at the hanger and the mounting portion, which is not sufficient.

On the other hand, in the exhaust pipe holding structure of the present invention, since the fixed shaft L direction has an angle with respect to the vertical direction (vertical direction), the input of the shear direction applied to the fixed shaft L direction of the hanger portion 1 is input. It is vector-decomposed and can be borne in a direction orthogonal to the fixed axis L direction (axis-direct direction). Therefore, it is possible to reduce the maximum input applied to the fixed axis L direction and the fixed axis L orthogonal direction with respect to the vibration in the vertical direction and the front-rear direction applied to the hanger portion 1. In addition, when an input is input in the direction perpendicular to the axis as well as the direction of the axis, a rotational movement is also generated. When the rotational movement occurs, the torsional rigidity is added in addition to the bending rigidity, so that the support rigidity (strength) of the hanger portion 1 and its mounting structure can be further secured, and the member holding the exhaust pipe wobbles. Can be suppressed and the holding of the exhaust pipe can be stabilized. As a result, the vibration (pulsation) from the exhaust pipe to the body side can be reduced in the hanger portion 1, and the vibration noise (noise) can also be reduced. The angle is most preferably 45 ° with respect to the vertical direction.

The hanger portion 1 is preferably connected to the side surface of the side member 3 via the bracket (hanger mounting portion) 2. As shown in FIGS. 1 and 3, in the present embodiment, the hanger portion 1 is coupled to the side surface of the RR side member 3 extending in the front-rear direction of the vehicle via the bracket (hanger mounting portion) 2. Here, the upper end of the bracket 2 is folded back, and the bracket 2 is joined to the side member 3 in a two-sided manner. In this way, by connecting the bracket perpendicularly to the kick-up portion of the joint surface between the side member 3 and the floor, the bending rigidity of the bracket can also be improved. In addition, the coupling rigidity can be improved by connecting in a multi-faceted manner.

In the present invention, by connecting the exhaust pipe hanger on the body side to the side member, the layout can be made similar to the hanger on the exhaust pipe side. In this way, since the hanger length is approached to the support position on the exhaust pipe side, the hanger length can be shortened and the bending rigidity of the hanger portion 1 itself can be improved.

Further, if the mounting location of the hanger portion 1 is not the floor panel (t0.8) but the side member 3 (t1.4) having a closed cross section, the rigidity of the hanger portion 1 itself is improved by connecting to a rigid member. In addition, there is an advantage that the deformation mode at the time of collision (side collision, rear collision) is not hindered. By arranging the hanger portion 1 outside the area where the mode is controlled by the side collision, the bracket 2 can be freely changed to a rigid shape.

A part of the hanger portion 1 fixed to the side surface of the side member 3 has a linear shape in FIG. 3, but may have a bent portion continuously in the linear portion in the fixed axis L direction. When the fixed hanger portion 1 has a bent portion, in principle, the side that is continuously fixed to the portion that is not fixed to the side surface of the side member 3 (the side that holds the exhaust pipe). The length direction (the side closer to) is defined as the fixed axial direction L. However, if the side that is continuously fixed to the side that is not fixed to the side of the side member 3 is significantly shorter than the other parts, or if it does not contribute to the vector decomposition of the input in the shear direction, this short part The length direction of the portion adjacent to is the fixed axial direction L. From the viewpoint of ensuring the strength of the mounting portion, which is the object of the present invention, the direction of the fixed portion having an action of vector-decomposing the input in the shear direction should be the fixed axial direction L.

1 ... Hanger part 2 ... Hanger mounting part (bracket)
3 ... Side member 4 ... Floor panel 11 ... Hanger

Claims (1)

In the exhaust pipe holding structure in which a rod-shaped hanger portion extends in the vehicle width direction with respect to the side member side surface of the vehicle.
A part of the hanger portion is fixed to the side member side surface via a bracket, and a portion not fixed to the side member side surface is bent and extends in the vehicle width direction.
The bracket is folded back and joined to the kick-up portion of the joint surface between the side member and the floor in a two-sided manner.
An exhaust pipe holding structure, wherein the fixed axis direction in which the hanger portion is fixed to the side member side surface has an angle from the vertical axis when the side member side surface is viewed from the vehicle side.

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