JP3987006B2 - Exhaust system finisher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a finisher fitted and supported on the outer peripheral surface of a tail pipe of an exhaust pipe in an exhaust system of an engine.
[0002]
[Prior art]
Conventionally, the finisher is fitted and supported by press fitting or the like through a support member on the outer peripheral surface of a tail pipe at the downstream end of the exhaust pipe, and is fixed to the tail pipe by screws (see Patent Document 1).
[0003]
[Patent Literature]
Japanese Patent Laid-Open No. 2002-138831
[Problems to be solved by the invention]
By the way, as shown in FIG. 6A, when the finisher is normally fixed to the tail pipe, the exhaust gas flowing through the tail pipe is diffused and guided by the large diameter portion at the downstream end of the finisher as shown by the arrow a. However, the finisher may fall off the tail pipe due to long-term use of the finisher or for some reason, as shown in FIG. 6B. In such a case, there is a problem that the guide function of the finisher is lost and a part of the exhaust discharged from the downstream end of the tail pipe flows upward and hits a bumper and the like, which may cause thermal damage.
[0005]
The present invention has been made in view of such a situation, and even if the finisher body falls off the tail pipe, the exhaust discharged from the tail pipe can be guided in a normal direction to cause the above problem. An object of the present invention is to provide a novel exhaust system finisher that does not have to be.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is an exhaust system finisher fitted and supported on the outer peripheral surface of a tail pipe, comprising a finisher body constituting an outer shell of the finisher, and the finisher body. in that a supporting support member for supporting the tail pipe, wherein the support member includes a cylindrical tailpipe side support portion to be welded is fitted on the tail pipe outer peripheral surface of the tail pipe-side support part A cone-shaped front space portion that extends forward from the front end, and a cone-shaped rear portion that extends rearward from the rear end of the tail pipe-side support portion and extends downstream from the end portion of the tail pipe. A pair of front and rear cylindrical finishers that are respectively connected to the outer side of the space portion and the outer ends of both space portions and touch the inner peripheral surface of the finisher body. It is more structure to the side support portion, characterized in that the finisher main body is screwed to at least one of the finisher main body side support portion back and forth.
[0007]
According to such a feature, the support member of the finisher has a front and rear intermediate portion thereof, i.e., a cylindrical tail pipe side support portion is welded and fixed to the tail pipe and does not have to worry about coming off, and the most downstream of the support member. Since the cone-shaped space on the side , that is, the rear side , extends downstream from the end of the tail pipe, the exhaust flowing through the tail pipe is supported even if the finisher body may come off the tail pipe. Since it is guided by the cone-shaped space portion on the rear side of the member and flows in a normal direction, a part of the exhaust does not go to a bumper or the like arranged close to the upper part of the finisher, and the heat generated by the exhaust heat Harm can be prevented.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on reference examples shown in the accompanying drawings and examples of the present invention.
[0009]
A reference example will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of a downstream portion of an exhaust system of an automobile engine equipped with the finisher of the present invention, and FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, and FIG. 4 is a sectional view taken along line 4-4 in FIG.
[0010]
In FIG. 1, an exhaust system Ex of an automobile engine (not shown) is between an upstream exhaust pipe 1 connected to an exhaust port of the engine and a downstream exhaust pipe or tail pipe 2 opened to the atmosphere. Further, a silencer M is connected, and a finisher F according to the present invention is connected to a terminal portion of the tail pipe 2.
[0011]
The finisher F according to the present invention is provided to decorate the end portion of the tail pipe 2 which is easily noticeable of the exhaust system Ex, and to improve the aesthetics of the exhaust system Ex. The specific structure will be described with reference to FIG.
[0012]
The finisher F includes a hollow cylindrical finisher body 3 serving as an outer shell, and two upstream and downstream support points S1 and S2 provided on the inner peripheral surface of the finisher F so as to be separated from each other in the front-rear direction, that is, the exhaust flow direction. The front and rear support members 4 and 5 are provided.
[0013]
The finisher body 3 is made of stainless steel and is formed in a cylindrical shape with both ends open.
[0014]
The upstream and downstream support portions S1 and S2 are respectively provided in stainless steel front and rear support members 4 and 5 having the same shape. The front and rear support members 4 and 5 are tail pipe side supports comprising cone-shaped space portions 4b and 5b spreading toward the downstream side and small-diameter cylindrical portions connected to the small-diameter side of the space portions 4b and 5b. It is composed of finisher body side support portions 4c and 5c including portions 4a and 5a and large-diameter cylindrical portions connected to the large-diameter side of the space portions 4b and 5b.
[0015]
The tail pipe side support portion 4a of the front support member 4 is in close contact with the outer peripheral surface of the tail pipe on the upstream side of the most downstream end of the tail pipe, and is spot welded W there. The support portion 4c is in intimate contact with the inner peripheral surface of the finisher body 3, and the space portion 4b defines an annular gap between the finisher body 3 and the tail pipe 2 and the annular gap. Is closed. On the other hand, the tail pipe side support portion 5a of the rear support member 5 is in close contact with the outer peripheral surface thereof at the most downstream end of the tail pipe 2 and is spot-welded W, and the finisher body side support portion thereof. 5c extends downstream from the most downstream end of the tail pipe 2 and is in close contact with the inner peripheral surface of the finisher body 3, and the space portion 5b extends from the most downstream end of the tail pipe 2. Is extended downstream, and an annular gap is defined between the finisher body 3 and the tail pipe 2 and the annular gap is closed.
[0016]
Weld nut 7 is welded on the lower portion surface of the finisher main body side support portion 4c of the front support member 4, to the weld nut 7, the clamp bolt 8 passing through the upstream end lower portion of the finisher main body 3 is screwed, which Thus, the finisher body 3 is integrally screwed to the tail pipe 2.
[0017]
In order to couple the finisher F configured as described above to the end portion of the tail pipe 2, the tail pipe side support portions 4a of the front and rear support members 4, 5 are provided on the outer peripheral surface of the end portion of the tail pipe 2. 5a is brought into close contact and spot welding W is performed on the contact portion. Next, the front and rear support members 4 and 5 of the finisher body side support portions 4c and 5c are contact-fitted to the outer peripheral surface of the finisher body 3, and then the weld nut 7 is passed through the lower front end of the finisher body 3 The bolt 9 is screwed. Thereby, the finisher F can be coupled to the end portion of the tail pipe 2 via the front and rear support members 4 and 5. In this coupled state, the rear support member 5 extends downstream from the end portion of the tail pipe 2.
[0018]
As described above, the front and rear support members 4 and 5 of the finisher F including the support portions S1 and S2 are fixed to the tail pipe 2 by spot welding , so that they do not come off from the tail pipe 2. Exhaust gas flowing through the tail pipe 2 is guided from the tail pipe 2 to the rear support member 5, flows as shown by a chain line arrow in FIG. 2, and is discharged to the atmosphere. Further, even if the finisher body 3 may fall off, the front and rear support members 4 and 5 are still fixed to the tail pipe 2, so that the exhaust gas flowing through the tail pipe 2 is exhausted from the rear support member 5. Therefore, a part of the exhaust gas flows upward to cause heat damage to the bumper B and the like, so that there is no worry like the conventional one.
[0019]
Next, referring to FIG. 5, described real施例of the present invention.
[0020]
FIG. 5 is a longitudinal sectional view of a tail pipe end portion provided with a finisher, in which the same elements as those in the reference example are denoted by the same reference numerals.
[0021]
The actual施例are those with two support points S1, S2 divided into exhaust flow direction which supports the finisher main body 3 to the tail pipe 2 to a single support member 104, the single support member 104 Is a cylindrical tail pipe side support portion 104a, and front and rear space portions 104b and 104b, which extend outward from both front and rear ends of the tail pipe side support portion 104a, and these space portions 104b, The cylindrical finisher main body side support portions 104c and 104c are connected to the outer end of the 104b. The tail pipe side support portion 104a is in close contact with the outer peripheral surface of the tail pipe 2 so that the exhaust flow It is fixed to the tail pipe 2 by spot welding W in the circumferential direction at two points separated in the direction. The finisher main body side support portion 104c, 104c is tightly contact with the inner peripheral surface of the finisher main body 3, further its rear space portion 1 04b is extended downstream from the end of the tail pipe 2, The front and rear space portions 104b and 104b define an annular gap between the finisher body 3 and the tail pipe 2 and close the annular gap.
[0022]
A weld nut 7 is welded to the lower inner surface of the finisher body side support portion 104 c at the front of the support member 104, and a clamp bolt 8 is screwed into the nut 7 from the outside of the finisher body 3. The finisher body 3 is fixed.
[0023]
Thus, even those of the actual施例, the support member 104 of the finisher main body, since there is no fear of falling off from the tail pipe, it exhibits the same effects as the embodiment.
[0024]
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 case where the finisher of the present invention is applied to the exhaust system of an automobile engine has been described, but it is needless to say that this can also be applied to the exhaust system of another engine. Moreover, in the said Example, although a tail pipe and a finisher main body are formed in the cylindrical shape, you may form this in an ellipse and another shape.
[0025]
【The invention's effect】
As described above, according to the first aspect of the present invention, the support member of the finisher is such that the front and rear intermediate portions thereof, that is, the cylindrical tail pipe side support portion are welded and fixed to the tail pipe and are likely to come off from there. In addition, the most downstream side of the support member , that is, the rear cone-shaped space portion extends downstream from the tail end portion of the tail pipe, so that the finisher main body may come off the tail pipe. The exhaust gas flowing through the tail pipe is guided by the cone-shaped space on the rear side of the support member and flows in a normal direction, and a part of the exhaust gas is directed to a bumper or the like arranged close to the finisher. Therefore, the heat damage caused by the exhaust heat can be prevented.
[Brief description of the drawings]
[1] equipped with a full Inissha, perspective of the downstream portion of the exhaust system of an automobile engine diagram (Reference Example)
2 is an enlarged longitudinal sectional view of the finisher taken along line 2-2 in FIG. 1. FIG . 3 is a sectional view taken along line 3-3 in FIG. 2. FIG . 4 is a sectional view taken along line 4-4 in FIG. FIG. 5 is a longitudinal sectional view of a tail pipe end portion provided with a finisher ( an embodiment of the present invention ).
6 is a sectional view of a conventional finisher [Explanation of symbols]
2 ----- tail pipe 3 ----- finisher Body 104 ... support members 104a · · tailpipe side support portion 104b · · the space portion 104c · · finisher main body side support section S1 · · · · supporting Location S2 ... Support location

Claims (1)

An exhaust system finisher fitted and supported on the outer peripheral surface of the tail pipe (2),
A finisher body (3) constituting the outer shell of the finisher, in those with its supporting support member (1 04) finisher body to (3) for supporting the tail pipe (2),
The support member (104) includes a cylindrical tail pipe side support portion (104a) that is fitted and fixed to the outer peripheral surface of the tail pipe (2), and a front side of the front end of the tail pipe side support portion (104a). The cone-shaped front space portion (104b) that expands toward the rear, and the rear end portion of the tail pipe side support portion (104a) extends rearward and extends downstream from the end portion of the tail pipe (2). A pair of front and rear cylindrical portions connected to the outer ends of the space portions (104b) on the rear side of the cone and the space portions (104b, 104b) respectively and in contact with the inner peripheral surface of the finisher body (3). The finisher body side support portion (104c, 104c) and
At least one of the finisher main body side support portion before or after (1 04c) to finisher main body (3) is characterized in that it is screwed, the exhaust system finisher.

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