JP2006348762A - Exhaust pipe for water retention - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust pipe for water retention preventing water produced by an oxidation catalyst from flowing out of an exhaust discharge opening of a tail tube to ground to dirt ground. <P>SOLUTION: The exhaust pipe for water retention in claim 1 is detachably installed on outer circumference of an exhaust discharge opening of the tail tube connected to an oxidation catalyst built-in type muffler and is provided with a water retention part retaining water dropping from the exhaust discharge opening. In an invention in claim 2, the exhaust pipe for water retention described in the claim 1 is formed in larger diameter than the tail tube, and consists of a tubular body having a bent part bending inward formed on a rear side end part and a support member supporting the tubular body with separating the same from an outer circumference of the tail tube. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water holding exhaust pipe that is attached to a tail tube, and more particularly to a water holding exhaust pipe that prevents water generated by an oxidation catalyst from flowing from the exhaust discharge port of the tail tube to the ground.

In order to reduce exhaust noise during vehicle travel, as shown in Patent Document 1 or FIG. 8, a muffler (silencer) 1 has been conventionally installed in the vehicle exhaust system, and a front tube is connected to the inlet pipe of the muffler 1 The tail tube 5 is connected to the outlet pipe 3 of the muffler 1.
In recent years, an oxidation catalyst built-in type muffler 1 incorporating an oxidation catalyst is installed in many vehicle exhaust systems. Due to layout restrictions, the tail tube 5 faces the exhaust discharge port 7 downward as shown in FIG. Are often connected to the muffler 1 at an angle.
JP 2003-286839 A

  However, the exhaust catalyst built-in type muffler has condensed water adhering to the internal catalyst carrier due to exhaust gas purification (catalytic action), and when the engine is started, the condensed water is warmed by the exhaust gas to turn into steam, and the muffler outlet (outlet pipe) However, if the tail tube is connected at an angle downward as described above, this water may travel inside the tail tube and flow out of the exhaust outlet. It was.

The exhaust gas of the diesel engine contains soot containing oil, and a lot of this soot adheres to the inner periphery of the tail tube. Thus, when water flows along the inside of the tail tube, At the same time, the spilled out and soiled the ground, which was not preferable.
The present invention has been devised in view of such circumstances, and a water holding exhaust pipe that prevents the water generated by the oxidation catalyst from flowing out from the exhaust discharge port of the tail tube to the ground and does not contaminate the ground. The purpose is to provide.

In order to achieve such an object, the water holding exhaust pipe according to claim 1 is detachably attached to the outer periphery of the exhaust discharge port of the tail tube connected to the oxidation catalyst built-in type muffler, and dropped from the exhaust discharge port. The water holding part which hold | maintains the water to perform is provided.
The invention according to claim 2 is the water holding exhaust pipe according to claim 1, wherein the water holding exhaust pipe is formed to have a larger diameter than the tail tube and is bent inward at the rear end. And a support member that supports the cylindrical body spaced apart from the outer periphery of the tail tube.

According to a third aspect of the present invention, in the exhaust pipe for water retention according to the second aspect, the support member is composed of a single partition plate that divides the cylindrical body forward and backward, and is provided at a substantially center of the partition plate. The tail tube insertion hole is open, and the invention according to claim 4 is the water retention exhaust pipe according to claim 2, wherein the support member is made of a plurality of plates. It is a feature.
Further, the invention according to claim 5 is the water holding exhaust pipe according to claim 1, wherein the water holding exhaust pipe has a diameter larger than that of the tail tube, and a front end portion side thereof is narrowed to the tail tube. The invention according to claim 6 is characterized by comprising a cylindrical body in which a support portion is formed, a bent portion that is bent inward is formed at the rear end portion, and a water holding portion is provided inside. The water holding exhaust pipe according to any one of claims 2 to 5, wherein the cylindrical body is formed in an elliptical cross section, and the major axis direction is arranged vertically. To do.

  According to a seventh aspect of the present invention, in the exhaust pipe for water retention according to any one of the first to sixth aspects, the cylindrical body is attached to the outer periphery of the tail tube by a clamp or a band fixture. It is fixed.

  After the engine is started, the water vapor generated from the oxidation catalyst is cooled at the muffler outlet and turns into water.The water travels inside the tail tube and flows out from the exhaust outlet, and adheres to the inner periphery of the tail tube. The soot containing oil flows out from the exhaust discharge port together with the water, but if the exhaust pipe for holding water according to each claim is attached to the tail tube, the water flowing out from the exhaust discharge port to the water holding portion Because it is held in, this water will not stain the ground.

Since the water holding exhaust pipe is detachable from the tail tube, when the water holding portion becomes dirty after long-term use, the water holding exhaust pipe can be removed from the tail tube and cleaned. It is also possible to remove the holding exhaust pipe from the tail tube and discard the water accumulated in the water holding section.
Further, according to the water holding exhaust pipe according to claim 2, claim 5 and claim 6, since the cylindrical body has an outer shape like an exhaust finisher, the appearance is not impaired, and the invention according to claim 3 According to the above, since the inside of the cylindrical body is partitioned forward and backward by the partition plate, dust and water entering from the front end portion side of the cylindrical body are shielded by the partition plate, and dust and water accumulate in the water holding portion. It has no advantage.

  Further, in the vehicle body mounted state, there are cases where a body guard or other bodywork exists near the exhaust outlet of the tail tube. However, as in the invention according to claim 6, the cylindrical body has an elliptical cross section. If the long axis direction is formed and arranged vertically, it is possible to lay out the water holding exhaust pipe while securing a sufficient clearance between the side guards and other peripheral structures, and the cross section of the cylinder. By forming an elliptical shape and arranging the major axis direction vertically, there is an advantage that the amount of water that can be held in the water holding part can be increased.

  And according to the invention which concerns on Claim 5, it has the advantage which can omit the partition plate of Claim 3, and the board | plate material of Claim 4, and can reduce a number of parts, According to the invention which concerns on Claim 7, By using a clamp or a band fixing tool, the water holding exhaust pipe can be easily attached and detached.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The same parts as those of the conventional example shown in FIGS.
1 to 4 show an embodiment of a water holding exhaust pipe according to claims 1 to 3 and claim 7, in which 11 is a cylindrical body formed of a steel pipe or a steel plate, The water holding exhaust pipe 13 according to the embodiment includes the cylindrical body 11 and a single partition plate 15 that supports the cylindrical body 11 on the outer periphery of the tail tube 5.

As described above with reference to FIG. 9, the tail tube 5 is connected to the exhaust catalyst built-in type muffler 1 with the exhaust discharge port 7 being inclined downward.
Thus, as shown in FIGS. 2 and 3, the cylindrical body 11 is formed with a larger diameter than the tail tube 5 and is bent at the rear end (vehicle rear side) inward by roll processing. The ridge formed with 17 has an outer shape like an exhaust finisher.

On the other hand, the partition plate 15 is formed by pressing a single steel plate having a circular shape when viewed from the front to form a flange portion 19 joined to the inner periphery of the cylindrical body 11 at the outer peripheral edge portion, and through which the tail tube 5 is inserted. An insertion hole 21 is opened at the center thereof, and a flange portion 23 that detachably supports the cylindrical body 11 on the outer periphery of the exhaust discharge port 7 of the tail tube 5 is drawn at the periphery of the insertion hole 21.
And the flange part 19 is welded to the inner periphery of the cylinder 11, and when the tail tube 5 is penetrated in the insertion hole 21 from the front side edge part (vehicle front side) side of the cylinder 11, as shown in FIG. The flange portion 23 abuts on the outer periphery of the tail tube 5, and the cylindrical body 11 is separated from the outer periphery of the tail tube 5 by the partition plate 15 and is supported in the same center axis as the tail tube 5. The interior is partitioned forward and backward by a partition plate 15. Then, as shown in FIG. 4, the water holding exhaust pipe 13 (partition plate 15) is fixed to the outer periphery of the tail tube 5 by tightening fasteners such as a clamp 25 and a band around the outer periphery of the flange portion 23. It has become.

Although not shown, the slits are provided in the flange portion 23 in the front-rear direction of the cylindrical body 11 so that the fixing by the clamp 25 becomes stronger.
As shown in FIG. 3, the depression at the lower side of the exhaust discharge port 7 in the cylindrical body 11 formed by the bent portion 17 and the partition plate 15 functions as a water holding portion 27 for water flowing out from the exhaust discharge port 7. It is supposed to be.

In addition, in FIG. 4, reference numeral 29 denotes a notch formed in the front end portion of the cylindrical body 11 in order to improve the workability of tightening / removing the clamp 25.
Since the water holding exhaust pipe 13 according to the present embodiment is configured as described above, in order to attach the water holding exhaust pipe 13 to the tail tube 5, as shown in FIG. The tail tube 5 may be inserted into the insertion hole 21 from the side, and the clamp 25 may be fastened to the outer periphery of the flange portion 23 as shown in FIG.

  Thus, as described above, after the engine is started, the water vapor generated from the oxidation catalyst is cooled at the muffler outlet (outlet pipe 3) and changed to water, and this water is transmitted through the tail tube 5 to the exhaust discharge port. 7 and the soot containing the oil adhering to the inner periphery of the tail tube 5 flows out from the exhaust discharge port 7 together with water. As described above, the water retaining exhaust pipe 13 is connected to the tail tube 5. The water flowing out from the exhaust discharge port 7 is held in the water holding part 27 in the cylinder 11. And the water hold | maintained at the water holding part 27 evaporates with the temperature rise of the tail tube 5 or the cylinder 11.

And when the water holding part 27 becomes dirty by long-term use, the clamp 25 is loosened, the water holding exhaust pipe 13 may be removed from the tail tube 5 and cleaned, and the water accumulated in the water holding part 27 may be removed. For disposal, the clamp 25 is loosened and the water retaining exhaust pipe 13 is removed from the tail tube 5.
Moreover, since the inside of the cylinder 11 is partitioned back and forth by the partition plate 15, dust and water entering from the front end side of the cylinder 11 are shielded by the partition plate 15, and these are blocked by the water holding unit 27. There is no accumulation.

As described above, by attaching the water holding exhaust pipe 13 according to the present embodiment to the tail tube 5, even if water generated by the oxidation catalyst flows out of the exhaust discharge port 7 of the tail tube 5, the water contaminates the ground. It was possible to prevent this.
Further, since the water holding exhaust pipe 13 is detachable from the tail tube 5, it can be appropriately cleaned and replaced, and can be attached to an existing tail tube, and by using a clamp 25 or a band fixing tool, the tail tube can be attached. It is easy to attach and detach the water holding exhaust pipe 13 to / from 5.

And since the cylindrical body 11 is exhibiting the external shape like an exhaust finisher, it has the advantage which does not impair aesthetics.
FIGS. 5 to 7 show one embodiment of a water holding exhaust pipe according to claims 1 to 3 and claims 6 and 7, wherein 31 is a steel pipe or steel plate formed in an elliptical cross section. The water holding exhaust pipe 33 according to the present embodiment is also a cylinder and is configured by the cylinder 31 and one partition plate 35 that supports the cylinder 31 on the outer periphery of the tail tube 5. 1 instead of the cylindrical body 11 of FIG. 1 formed in a cylindrical shape, the cylindrical body 31 is formed in an elliptical cross section, and the partition plate 35 is replaced with an elliptical shape in front view instead of the partition plate 15 having a circular shape in front view. The cylindrical body 31 is formed to have a larger diameter than the tail tube 5, and a bent portion 37 that is bent inward by roll processing is formed at the rear end portion, and has an outer shape like an exhaust finisher. ing.

  Similarly, the partition plate 35 is formed by pressing one sheet of an elliptical steel plate when viewed from the front to form a flange portion 39 joined to the inner periphery of the cylindrical body 31 at the outer periphery, and the tail tube 5 is inserted therethrough. An insertion hole (not shown) opens in the center thereof, and a flange portion (not shown) that supports the cylindrical body 31 detachably on the outer periphery of the exhaust discharge port 7 of the tail tube 5 is provided at the periphery of the insertion hole. ) Is drawn.

  The flange portion 39 is welded to the inner periphery of the cylindrical body 31. When the tail tube 5 is inserted into the insertion hole from the front end (vehicle front side) side of the cylindrical body 31, the flange portion becomes the tail tube 5. The cylindrical body 31 is separated from the outer periphery of the tail tube 5 by the partition plate 35 and supported by the same center axis as the tail tube 5, and the interior of the cylindrical body 31 is front and rear by the partition plate 35. It is designed to be partitioned.

The cylindrical body 31 is mounted on the tail tube 5 with its long axis direction arranged vertically.
Then, as shown in FIG. 7, a fixing tool such as a clamp 41 is fastened to the outer periphery of the flange portion that contacts the outer periphery of the tail tube 5, and the water holding exhaust pipe 33 is fixed to the outer periphery of the tail tube 5. The front end of the cylinder 11 is cut obliquely in consideration of the workability of tightening / removing the clamp 41.

Although not shown in the drawings, in the present embodiment, the slits are provided in the flange portion in the front-rear direction of the cylindrical body 31 so that the fixing by the clamp 41 becomes stronger.
And the hollow of the lower part by the side of the exhaust discharge port 7 in the cylinder 31 formed of the said bending part 37 and the partition plate 35 functions as the water holding part 43 of the water which flows out from the exhaust discharge port 7. .

The water holding exhaust pipe 33 according to the present embodiment is configured in this way, and the water holding exhaust pipe 33 is attached to the tail tube 5 from the front end portion side of the cylindrical body 31 into the insertion hole. 5 and the clamp 41 may be tightened to the outer periphery of the flange portion as shown in FIG.
Thus, as described above, after the engine is started, the water vapor generated from the oxidation catalyst is cooled at the muffler outlet to change into water, and this water is transmitted through the tail tube 5 and flows out from the exhaust discharge port 7 to the outside. The soot adhering to the inner periphery of the tail tube 5 flows out from the exhaust discharge port 7 together with water. However, if the water holding exhaust pipe 33 is attached to the tail tube 5 as described above, the exhaust discharge port 7 The water flowing out from the outside is held in the water holding portion 43 in the cylindrical body 31. And the water hold | maintained at the water holding | maintenance part 43 evaporates with the temperature rise of the tail tube 5 or the cylinder 31. FIG.

If the water holding part 43 becomes dirty after long-term use, the clamp 41 is loosened, the water holding exhaust pipe 33 may be removed from the tail tube 5 and cleaned, and the water accumulated in the water holding part 43 is discarded. For this purpose, the water holding exhaust pipe 33 may be removed from the tail tube 5.
Also in this embodiment, the inside of the cylinder 31 is partitioned back and forth by the partition plate 35, so that dust and water entering from the front end side of the cylinder 31 are shielded by the partition plate 35, and these are There is no accumulation in the water holding part 43.

By attaching the water holding exhaust pipe 33 to the tail tube 5 in this way, even if water generated by the oxidation catalyst flows out from the exhaust discharge port 7 of the tail tube 5, it is possible to prevent the water from soiling the ground. It was possible to do.
Further, since the water holding exhaust pipe 33 is detachable from the tail tube 5, it can be appropriately cleaned and replaced, and can be attached to an existing tail tube, and by using a clamp 41 or a band fixing tool, the tail tube can be attached. It is easy to attach and detach the water holding exhaust pipe 33 to the 5.

And since the cylindrical body 31 is exhibiting the external shape like an exhaust finisher, it has the advantage which does not impair aesthetics.
Furthermore, in the vehicle mounted state, as shown in FIG. 6, there may be a frame such as a side guard 45 in the vicinity of the exhaust discharge port 7 of the tail tube 5. By using a cylindrical body 31 having an elliptical cross section instead of the body 11 and arranging the longitudinal direction thereof vertically, a sufficient clearance is secured between the side guard 45 and other peripheral structures, and the water holding exhaust. The pipe 33 can be laid out, and the amount of water that can be held in the water holding unit 43 can be increased.

  In the above-described embodiments, the cylindrical bodies 11 and 31 are detachably supported on the outer periphery of the tail tube 5 by the single partition plates 15 and 35. However, the cross-sectional shapes of the partition plates 15 and 35 are the same. The cylinders 11 and 31 may be detachably supported on the outer periphery of the tail tube 5 by a plurality of strip-shaped plate members (support members). According to an embodiment of the present invention, Similarly, even if water generated by the oxidation catalyst flows out from the exhaust discharge port 7 of the tail tube 5, it is possible to prevent the ground from being soiled by this water.

Further, for example, instead of the partition plate 15, the front side of the cylinder body 11 is squeezed (reduced in diameter) like the cross-sectional shape of the partition plate 15, and the cylinder body 11 is supported on the outer periphery of the tail tube 5 by the cylinder body 11 itself. A supporting part may be provided.
Thus, according to the embodiment of claim 5, as in the embodiment of FIG. 1, the desired object can be achieved, and the number of parts can be reduced by omitting the partition plate 15. Have

  In addition, the cylindrical body is not limited to the above-described cylindrical shape or elliptical cross section, and various modes are possible.

FIG. 9 is an overall perspective view of a tail tube equipped with a water retention exhaust pipe according to one embodiment of claims 1 to 3 and claim 7. It is a cross-sectional perspective view of a water holding exhaust pipe and a tail tube. It is sectional drawing of the exhaust pipe for water holding | maintenance, and a tail tube. It is a perspective view of a water retention exhaust pipe and a tail tube. FIG. 7 is an overall perspective view of a tail tube equipped with a water holding exhaust pipe according to one embodiment of claims 1 to 3, claim 6, and claim 7. It is a perspective view of a tail tube equipped with a side guard and a water holding exhaust pipe. It is a top view of the tail tube which attached the side guard and the exhaust pipe for water retention. It is a whole perspective view of the conventional structure of an oxidation catalyst built-in type muffler and a tail tube connected thereto. It is a side view of the conventional structure of an oxidation catalyst built-in type muffler and a tail tube connected thereto.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Muffler with built-in oxidation catalyst 3 Tail pipe 5 Tail tube 7 Exhaust discharge port 11, 31 Cylinder 13, 33 Water holding exhaust pipe 15, 35 Partition plate 17, 37 Bent part 19, 23, 39 Flange part 21 Insertion hole 25, 41 Clamp 27, 43 Water holding part 45 Side guard

Claims (7)

  For water retention, characterized in that it is detachably mounted on the outer periphery of the exhaust discharge port of the tail tube connected to the oxidation catalyst built-in type muffler, and is provided with a water retaining part for retaining water dripping from the exhaust discharge port Exhaust pipe.   The water-holding exhaust pipe is formed with a diameter larger than that of the tail tube, a bent portion that is bent inwardly at the rear end, and a water-holding portion is provided inside, and the cylinder is tailed. The exhaust pipe for water retention according to claim 1, comprising a support member that is supported apart from the outer periphery of the tube.   The water retaining member according to claim 2, wherein the support member is composed of one partition plate that divides the cylindrical body forward and backward, and an insertion hole of the tail tube is opened at a substantially center of the partition plate. Exhaust pipe.   The water holding exhaust pipe according to claim 2, wherein the support member is made of a plurality of plate members.   The water-holding exhaust pipe has a diameter larger than that of the tail tube, and its front end is squeezed to form a support portion for the tail tube, and a bent portion that is bent inward is formed at the rear end. The exhaust pipe for water retention according to claim 1, comprising a cylindrical body provided with a water retention portion therein.   The water holding exhaust pipe according to any one of claims 2 to 5, wherein the cylindrical body is formed in an elliptical cross section, and a major axis direction is arranged vertically.   The water holding exhaust pipe according to any one of claims 1 to 6, wherein the cylindrical body is fixed to an outer periphery of the tail tube by a clamp or a band fixing tool.

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