JP2005299411A - Layout structure of exhaust system finisher for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the aesthetic quality of the surroundings of an end of a tail pipe with a finisher attached thereto, in a layout structure of a finisher attached to a tail pipe in a vehicular exhaust system, without causing exhaust gas to damage a rear bumper due to pollution or heat even when the gap between the finisher and the rear bumper is small. <P>SOLUTION: The tail pipe 2 and the finisher F are each formed in a cylinder having an axis following along the flow direction of exhaust gas. The axis L2F-L2F of the end 2F of the tail pipe 2 is inclined further downward in the flow direction of exhaust gas than the axis LF-LF of the finisher F. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an arrangement structure of a finisher on a tail pipe of an exhaust system in a vehicle.

Conventionally, in a vehicle such as an automobile, a finisher is attached to a tail pipe downstream of the exhaust system of the engine so as to improve the appearance around the tail pipe so as to upgrade the entire vehicle. The arrangement structure of the finisher on the tail pipe is disclosed in Patent Document 1, for example.
JP 2002-138830 A

  By the way, in what is disclosed in Patent Document 1 (see FIGS. 2 and 5), the downstream exhaust pipe (tail pipe) 2 and the finisher F attached to the terminal end thereof are both in the exhaust gas flow direction. The axis of the tail end of the tail pipe 2 and the axis of the finisher F are coaxial in the exhaust gas flow direction.

  When such a finisher arrangement structure is implemented in an exhaust system of a vehicle engine, the finisher is generally arranged below a rear bumper attached to the vehicle. In order to further improve, it is desirable to make the gap between the upper part of the outer periphery of the finisher and the lower end of the rear bumper as small as possible.

  However, in the case where such a finisher arrangement structure is adopted, as shown in FIG. 5, the upper portion of the outer periphery of the finisher attached to the end portion of the tail pipe and the rear bumper are provided to further enhance the beauty around the tail pipe. When the gap between the lower end and the lower end is reduced, a part of the exhaust gas flow discharged from the tail pipe to the outside through the finisher is directed to the rear bumper as shown by the white line arrow A ′ in FIG. The rear bumper has a problem of fouling and heat, especially when the finisher's axis along the flow direction of the exhaust gas is inclined upward (rear bumper side) toward the rear of the vehicle. The exhaust gas flow toward the rear bumper is further increased, and the above problem is further increased.

  The present invention has been made in view of the above circumstances, and can reduce the gap between the upper portion of the outer periphery of the finisher and the lower end of the rear bumper without causing the rear bumper to be polluted or thermally damaged. It is an object of the present invention to provide an arrangement structure for an exhaust system finisher in a new vehicle that can further improve the aesthetics of the surroundings.

  In order to achieve the above object, according to the first aspect of the present invention, a finisher is attached to the outer periphery of the tail pipe end portion constituting the downstream portion of the exhaust system, and the finisher is disposed below the rear bumper of the vehicle. In the exhaust system finisher arrangement structure in the vehicle, the tail pipe and the finisher are both formed in a cylindrical shape having an axis along the flow direction of the exhaust gas, and the axis of the tail end portion of the tail pipe is It is characterized in that it is inclined downward in the flow direction of the exhaust gas from the axis.

  In a vehicle, it is common to form a notch (recessed portion) from the lower end (from the road surface side) of the rear bumper so that a part of the outer periphery (upper portion) of the finisher is accommodated in the notch. Therefore, the point that “the finisher is disposed below the rear bumper of the vehicle” includes such a configuration.

  According to the first aspect of the present invention, since the axis of the tail end portion of the tail pipe is inclined downward in the flow direction of the exhaust gas from the axis of the finisher, the exhaust gas discharged from the finisher is on the lower side. (Road surface side), and the rear bumper around the finisher is not polluted or heat damaged, and the gap between the upper part of the finisher outer periphery and the lower end of the rear bumper can be made as small as possible. The aesthetic improvement around the end portion of the tail pipe by the finisher installation can be made more remarkable.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention illustrated in the accompanying drawings.

  FIG. 1 is a partial perspective view of an exhaust system of a vehicle engine equipped with a finisher arrangement structure of the present invention, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. FIG. 4 is a perspective view of the front support member of the finisher.

  1 and 2, an inlet of a silencer M is connected to a downstream portion of an exhaust pipe 1 in an exhaust system Ex of an engine E for a vehicle, and a tail pipe 2 is connected to an outlet of the silencer M. A finisher F is attached to the end portion 2F.

  The finisher F is attached to the end portion 2F of the tail pipe 2 in order to decorate the periphery of the end portion 2F of the tail pipe 2 that is easily visible to the exhaust system Ex and to improve the appearance around the end portion 2F. In the following, the structure of the finisher F will be described with reference to FIGS.

  The cylindrical finisher F is fixed to the finisher main body 10 constituting the main portion thereof, the front support member 20 fixed to the inner peripheral surface of the front opening end, and the inner peripheral surface of the rear opening end. And a rear support member 30.

  The finisher body 10 is formed in a cylindrical shape with both ends open by a heat-resistant metal plate such as a stainless steel plate, its outer peripheral surface 11 has a glossy surface finish, and its rear edge 12 has a cross-section U It is folded back inward in a letter shape, and a rear portion 31 of a rear support member 30 described later is fixed. Further, a through-hole 13 through which the clamp bolt 25 is inserted is opened on the front bottom surface of the finisher body 10.

  As shown most clearly in FIG. 4, the cylindrical front support member 20 is formed in a ring shape from a heat-resistant metal plate such as a stainless steel plate, and is joined to the outer periphery of the front portion of the finisher body 10 on the outer periphery thereof. And a pair of arc-shaped tail pipe receiving surfaces 22 and 22 that are recessed radially inward in the left and right upper halves, and a flat tail pipe fixed to the lower surface thereof. A portion 23 is formed, and a square weld nut 24 is welded to the inner surface of the tail pipe fixing portion 23. As shown in FIG. 2, the front support member 20 has an outer peripheral surface (joint surface) 21 fitted and fixed to the front inner peripheral surface of the finisher body 10, and a clamp bolt 25 is screwed into the weld nut 24. It is.

  The rear support member 30 is also formed of a heat-resistant metal plate such as a stainless steel plate and is fixed to the inner surface of the rear end portion of the finisher body 10. The intermediate portion 32 and a short cylindrical front portion 33 following the front end thereof are configured. The outer peripheral surface of the end portion 2F of the tail pipe 2 is fitted and supported on the inner peripheral surface of the front portion 33. Further, a stopper surface 34 that abuts the rear edge of the rear end 2F of the tail pipe 2 is formed at the boundary between the cylindrical front portion 32 and the intermediate portion 32.

  As shown in FIGS. 2 and 3, the tail pipe 2 into which the exhaust gas is introduced is formed in a hollow cylindrical shape, and its end portion 2F is inclined downward along the flow direction of the exhaust gas, The axis L2F-L2F of the end portion 2F is inclined downward in the exhaust gas flow direction with respect to the axis L2-L2 of the tail pipe 2 at a portion upstream of the end portion 2F.

  In order to attach the finisher F to the tail pipe 2, the end portion 2F of the tail pipe 2 is inserted into the finisher F from the front thereof. As a result, the end portion 2F of the tail pipe 2 is supported by the front support member 20 so that the rear end (downstream end) is fitted and supported on the inner peripheral surface of the front portion 33 of the rear support member 30 and the rear end. The edge abuts against the stopper surface 34 of the rear support member 33 (see FIG. 2), and the finisher F is axially positioned with respect to the tail pipe 2. Further, the outer peripheral surface of the end portion 2F of the tail pipe 2 is in contact with the pair of tail pipe receiving surfaces 22 of the front support member 20, and the upper position of the tail pipe 2 with respect to the finisher F is restricted. Here, from below the finisher 2, if the clamp bolt 25 is screwed into the weld nut 24 and tightened through the through-hole 13, the tip of the clamp bolt 25 abuts against the outer surface of the end portion 2F, as shown in FIGS. Thus, the finisher F can be fixed to the tail pipe 2.

  By the way, in the state where the finisher F is fixed to the tail pipe 2 as shown in FIG. 2, the finisher F is disposed in close proximity with a small gap D below the rear bumper RB of the vehicle. The axis L2F-L2F of the end portion 2F of the tail pipe 2 flows with respect to the axis LF-LF of the finisher F (parallel to the axis L2-L2 of the tail pipe 2 upstream of the end portion 2F). Inclined downward in the direction (road surface G side). Therefore, the exhaust gas flowing through the tail pipe 2 through the exhaust pipe 1 and the silencer M from the engine E flows downward and is released to the outside.

  Thus, as described above, the axis L2F-L2F of the end portion 2F of the tail pipe 2 through which the exhaust gas flows is in the flow direction of the exhaust gas with respect to the axis LF-LF of the finisher F (substantially parallel to the road surface G). 2 is inclined downward (road surface G side), and the flow of the exhaust gas flowing through the end portion 2F is in the direction away from the upper edge of the finisher F, as indicated by the white line arrow A in FIG. Is directed downward and hardly hits the rear bumper RB. As a result, even if the lower end of the rear bumper RB is located close to the upper portion of the outer periphery of the finisher F and the lower end of the rear bumper RB is close to the exhaust gas, the exhaust gas discharged from the finisher F hits the rear bumper RB and Bumper RB is not soiled or heat damaged. And the beauty | look around the tail pipe 2 by installation of the finisher F can be improved further.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example, in the above-described embodiment, the finisher axis LF-LF is substantially parallel to the road surface G, but this axis may be inclined downward or upward in the exhaust gas flow direction with respect to the road surface. . In the above embodiment, the tail pipe 2 and the finisher F are formed in a cylindrical shape, but they may be formed in an elliptical cylindrical shape or other cylindrical shapes.

The partial perspective view of the exhaust system of the engine for vehicles provided with the arrangement structure of the finisher of the present invention Enlarged cross-sectional view along line 2-2 in FIG. Sectional view along line 3-3 in FIG. A perspective view of the front support member of the finisher Cross section of tailpipe and finisher in the exhaust system of a conventional vehicle

Explanation of symbols

2 ... Tail pipe 2F ... Tail pipe end Ex ...... Exhaust system F ... Finisher RB ················· Rear bumper L2F-L2F ···· Axis line LF-LF of the end portion ····················· Axis line of the finisher

Claims (1)

A finisher (F) is mounted on the outer periphery of the end portion (2F) of the tail pipe (2) constituting the downstream portion of the exhaust system (Ex), and this finisher (F) is placed below the rear bumper (RB) of the vehicle. In the arrangement structure of the exhaust system finisher in the vehicle,
Both the tail pipe (2) and the finisher (F) are formed in a cylindrical shape having an axis along the flow direction of the exhaust gas,
The axis (L2F-L2F) of the end portion (2F) of the tail pipe (2) is inclined downward in the exhaust gas flow direction from the axis (LF-LF) of the finisher (F). Arrangement structure of exhaust system finisher in vehicle.

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