JP6497868B2 - Exhaust pipe mounting structure - Google Patents

Description

  The present invention relates to an exhaust pipe mounting structure for mounting an exhaust pipe of a vehicle.

  Conventionally, as an exhaust pipe mounting structure for mounting an exhaust pipe of a vehicle, for example, there is one described in Patent Document 1. This type of exhaust pipe mounting structure is specifically configured as shown in FIG. 3, and an opening 50b is provided in the rear surface 50a of the rear bumper 50. The opening 50b is an annular member 51 made of aluminum or the like. And a small diameter portion 52a of the cylindrical body 52 is fitted and fixed to the inner peripheral portion of the annular member 51. The cylindrical body 52 is provided with a large-diameter portion 52b connected to the small-diameter portion 52a. The large-diameter portion 52b is provided at the rear end of the exhaust pipe 54 disposed on the front side of the vehicle body with respect to the rear surface 50a of the rear bumper 50. It arrange | positions so that the vicinity outer periphery part of the exhaust port 54a may be covered.

Japanese Patent Laying-Open No. 2004-308551 (see paragraphs 0020-0026 and FIGS. 2 and 3)

  By the way, in the exhaust pipe mounting structure described above, if the wind directed from the rear to the front of the vehicle is blowing, the exhaust gas flows back through the exhaust pipe 54 when the engine is stopped, and the exhaust gas that has flowed back to the entire intake system is filled. In order to start the engine, it is necessary to wait for exhaust gas filled in the intake system to be exhausted, which may cause a start-up failure that takes time until the engine starts.

  In order to prevent such a backflow of exhaust gas due to wind, it is conceivable to simply level the exhaust port of the exhaust pipe substantially without using the annular member 51 and the cylindrical body 52 as shown in FIG. However, when the wind blows obliquely from below, it is not possible to reliably prevent the exhaust gas from flowing back through the exhaust pipe even if the exhaust ports are horizontally arranged. In addition, it is conceivable to cover the exhaust port part with another member after leveling the exhaust port, but simply covering the exhaust port part cannot satisfy the legal regulation that the rear bumper and the exhaust pipe overlap.

  An object of the present invention is to reliably prevent the backflow of exhaust gas with a simple configuration even when there is a wind traveling from the rear to the front of the vehicle, thereby preventing the occurrence of engine start failure. .

In order to achieve the above-described object, an exhaust pipe mounting structure according to the present invention is an exhaust pipe mounting structure for mounting an exhaust pipe of a vehicle, wherein a horizontally disposed cylindrical base body and a rear end portion of the base body are provided. a flange portion disposed by polymerization on the opening peripheral edge formed provided the rear bumper, and an insertion portion provided flared toward obliquely upward and forward in the front end portion above containing front opening of the front SL base The exhaust pipe has a substantially horizontal exhaust port end face at the rear end portion of the exhaust pipe disposed at substantially the same height as the upper surface of the base body in a side view, and obliquely downward from the end face of the insertion portion to the inside. The insertion portion is formed such that the cross-sectional area of the insertion portion is larger than the cross-sectional area of the rear end portion of the exhaust pipe in the inserted state. , especially a gap is provided on the lower side of the rear end of the exhaust pipe It is set to (claim 1).

According to the first aspect of the present invention, the rear bumper is formed with a rectangular opening, the square cylindrical base is horizontally disposed in front of the opening, and the flange formed at the rear end of the base is the rear bumper. polymerizing the opening peripheral edge is disposed, the insertion portion which is flared towards the diagonally upward and forward to the front end portion above containing front opening of the base body is formed, the rear end portion of the exhaust pipe inserted inside of the insertion portion The substantially horizontal exhaust port end surface of the rear end portion of the exhaust pipe is arranged at substantially the same height as the upper surface of the base body in a side view, and the cross-sectional area of the insertion portion is in the inserted state in the cross section at the end surface of the insertion portion. insertion portion to be larger than the cross-sectional area of the rear end portion of the exhaust pipe is formed, because have a gap is provided on the lower side of the rear end portion of the exhaust pipe, by blowing the wind toward the front from the rear of the vehicle However, when the engine is stopped, the exhaust gas from the exhaust pipe flows forward inside the base. Do configuration makes it possible to prevent the filling of the exhaust gas to the intake system, such as a conventional and reliably prevent backflow into the exhaust pipe of the exhaust gas, it is possible to prevent the occurrence of engine starting failure.

1 is a perspective view of an embodiment of an exhaust pipe mounting structure according to the present invention. FIG. 2 is a cut side view of FIG. 1. It is a cutaway side view of the conventional exhaust pipe mounting structure.

  Next, an embodiment of an exhaust pipe mounting structure according to the present invention will be described in detail with reference to FIGS. The front, rear, left, and right in the present embodiment mean front, rear, left, and right when viewed in a seated state.

  As shown in FIGS. 1 and 2, a rectangular opening 1b is formed in the rear end face 1a of the rear bumper 1, and a rectangular tubular base 2 made of aluminum or the like is horizontally disposed in front of the opening 1b. A flange portion 2a formed integrally with the rear end of the rear bumper 1 is superposed on the periphery of the opening 1b of the rear bumper 1, and the upper front end of the base 2 is expanded forward to form an insertion portion 2b. The rear end portion of the exhaust pipe 3 is inserted inside 2b, and the rear end portion of the exhaust pipe 3 is disposed so as to overlap a part of the base 2 attached to the rear bumper 1 in a side view. At this time, the end face of the exhaust port 3a at the rear end of the exhaust pipe 3 is processed and formed substantially horizontally.

  Further, as shown in FIGS. 1 and 2, a protrusion 2 c swelled in the left-right direction is formed near the boundary between the rear end of the lower portion of the base 2 and the flange portion 2 a, and is included in the exhaust gas from the exhaust pipe 3. The protrusion 2c prevents the soot from flowing out so that the soot does not flow to the outside and stain the rear bumper 1.

  Further, as shown in FIGS. 1 and 2, a through hole 2d that is long in the left-right direction is provided in the front end portion of the lower portion of the base 2, and soot in the exhaust gas blocked by the protrusion 2c is formed in the through hole 2d. Is discharged to the outside together with moisture.

  Further, as shown in FIGS. 1 and 2, an inclined portion 2 e that is slightly inclined upward is formed at the lower front end of the base 2, and exhaust gas when wind from the rear of the vehicle blows into the base 2. The air reservoir is formed behind the inclined portion 2e so that the exhaust gas flows forward along the inclined portion 2e.

  Further, a metal bracket 5 for fixing the base 2 is fixed to the lower part of the inner peripheral edge of the opening 1b of the rear bumper 1, and a metal mounting piece 6 having a flat plate shape is fixed to the lower surface of the base 2 for mounting. The piece 6 is provided with a circular bolt insertion hole 6a, and the bracket 5 is also provided with a similar bolt insertion hole. The bolt 7 is inserted into the bolt insertion hole 6 of the bracket 5 and the mounting piece 6, and the washer. A nut 9 is screwed through 8 to fix the attachment piece 6 to the bracket 5, and the base 2 is attached to the rear bumper 1. At this time, the heat of the exhaust gas can be radiated to the outside through the metal attachment piece 6 and the bracket 5.

  As described above, the rectangular opening 1b is formed in the rear bumper 1, the square cylindrical base 2 is horizontally disposed in front of the opening 1b, and the flange 2a formed integrally with the rear end portion of the base 2 is provided as the rear bumper. 2 by superposing the rear end portion of the exhaust pipe 3 inside the insertion portion 2b formed at the upper front end portion of the base body 2 so that the thick line arrow in FIG. As shown in the figure, even when wind directed from the rear to the front of the vehicle blows into the base 2, the exhaust gas from the exhaust pipe 3 can flow forward inside the base 2 as indicated by the arrows in FIG. The backflow of gas to the exhaust pipe 3 can be reliably prevented to prevent the exhaust gas from being filled into the intake system of the engine.

  Therefore, according to the above-described embodiment, even when the wind directed from the rear to the front of the vehicle is blowing, the exhaust gas from the exhaust pipe 3 inside the base body 2 can be made to flow forward when the engine is stopped. With a simple configuration, it is possible to reliably prevent the exhaust gas from flowing back into the exhaust pipe 3 and to prevent the exhaust gas from being filled into the intake system as in the past, thereby preventing the occurrence of engine start failure. Can do. At this time, since an air pool is formed behind the inclined portion 2e, the exhaust gas easily flows forward along the inclined portion 2e.

  Further, the protrusion 2c can prevent the soot from flowing out of the exhaust pipe 3 so that the soot does not flow outside and contaminate the rear bumper 1, so that the soot in the exhaust gas blocked by the protrusion 2c can be prevented. Can be discharged together with moisture from the through-hole 2d. Further, the heat of the exhaust gas can be efficiently radiated to the outside through the metal mounting piece 6 and the bracket 5.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the case where the base body 2 has a square cylindrical shape has been described, but it may be cylindrical.

  Further, in the above-described embodiment, the example in which the insertion portion 2b that is widened forward is formed at the upper front end portion of the base body 2, but the insertion portion 2b is arranged so that the insertion portion 2b follows the outer periphery of the exhaust pipe 3 is used. You may form a cross section in circular arc shape, and make the clearance gap with the exhaust pipe 3 as narrow as possible.

DESCRIPTION OF SYMBOLS 1 ... Rear bumper 1a ... Opening 2 ... Base | substrate 2a ... Blanged part 2b ... Insertion part 3 ... Exhaust pipe

Claims (1)

In the exhaust pipe mounting structure for mounting a vehicle exhaust pipe,
A cylindrical base disposed horizontally;
A flange portion disposed on the periphery of the opening formed in the rear bumper provided at the rear end of the base body ; and
And a insertion portion provided flared toward obliquely upward and forward in the front end portion above containing front opening of the front Stories substrate,
The rear end of the exhaust pipe is inclined obliquely inward from the end face of the insertion portion so that the substantially horizontal exhaust port end face of the rear end of the exhaust pipe is disposed at substantially the same height as the upper surface of the base body in a side view. An end portion is inserted, and in the cross section at the end face of the insertion portion, the insertion portion is formed such that a cross-sectional area of the insertion portion is larger than a cross-sectional area of a rear end portion of the exhaust pipe in the inserted state, An exhaust pipe mounting structure , wherein a gap is provided below the rear end of the exhaust pipe.

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