JP4546880B2 - Exhaust pipe for water retention - Google Patents

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. 6 , a muffler (silencer) 1 is conventionally attached to 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.
The downward muffler 1 of the oxidation catalyst embedded with a built-in oxidation catalyst is mounted on many vehicles exhaust system, constraints on the layout, the tail tube 5 exhaust discharge port 7 as shown in FIG. 7 nowadays Are often connected to the muffler 1 at an angle.

  However, a muffler with a built-in oxidation catalyst attaches condensed water to the internal catalyst carrier due to exhaust gas purification (catalysis), and when the engine starts, the condensed water is warmed by the exhaust gas and turns 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 flow inside the tail tube and flow out from 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 invention according to claim 1 is characterized in that the outer periphery of the tail tube connected to the oxidation catalyst built-in muffler is spaced from the outer periphery of the tail tube via one partition plate. And a water holding exhaust pipe comprising a cylindrical body that is detachably mounted, wherein the cylindrical body is formed in an elliptical cross section having a larger diameter than the tail tube, and the longitudinal direction is arranged vertically. A bent portion that is bent inward is formed at a rear end portion, and a water holding portion is provided therein, and the partition plate partitions the cylindrical body forward and backward, and an insertion hole of the tail tube is provided at substantially the center thereof. It is characterized by opening .

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 water. However, if the water holding exhaust pipe according to claim 1 is attached to the tail tube, the water flowing out from the exhaust discharge port is discharged 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.
Also, since the tubular body exhibits exhaust finisher of such external shape, since it is rather Na disfiguring, the internal tubular body is partitioned into front and rear by a partition plate, enters from the front end side of the cylindrical body Dust and water are shielded by the partition plate, and there is an advantage that dust and water do not accumulate in the water holding portion.

Moreover, Te is at the bodywork state of the vehicle, there is a case where KaSobutsu the side guards, such as near the exhaust outlet of the tail tube is present, the major axis direction to form a tubular body to an elliptical cross-sectional shape If it is arranged vertically, it is possible to lay out the water-holding exhaust pipe with a sufficient clearance between the side guard and other peripheral structures, and to form a cylindrical body with an elliptical cross section. By arranging the axial direction vertically, there is an advantage that the amount of water that can be held in the water holding part can be increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Incidentally, their structures will be denoted by the same reference numerals are the same as the conventional example shown in FIGS. 6 and 7 will be omitted.
1 to 5 show an embodiment of a water retaining an exhaust pipe according to claim 1, figure, 31 is a cylindrical body formed of steel or steel sheet cross-sectional elliptical shape, the water retention of the present embodiment The exhaust pipe 33 is composed of the cylindrical body 31 and a single partition plate 35 that supports the cylindrical body 31 on the outer periphery of the tail tube 5.

As described above with reference to FIG. 7 , 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 31 is formed to have a larger diameter than the tail tube 5 , and is bent inward by roll processing at the rear end (vehicle rear side). A bent portion 37 is formed to have an outer shape such as an exhaust finisher.

On the other hand, the partition plate 35, a single front view oval circular steel by pressing, with a flange portion 39 joined to the inner periphery of the cylindrical body 31 is formed at the outer peripheral edge portion, a tail tube 5 is inserted The insertion hole 38 is opened at the center thereof, and a flange portion 40 that detachably supports the cylindrical body 31 on the outer periphery of the exhaust discharge port 7 of the tail tube 5 is drawn at the periphery of the insertion hole 38 .
The flange portion 39 is welded to the inner periphery of the cylindrical body 31, when inserting the tail tube 5 front end of the tubular body 31 from (vehicle front side) side into the insertion hole 38 as shown in FIG. 3 , the flange portion 40 contacts the outer circumference of the tail tube 5, the tubular body 31 by the partition plate 35 spaced apart from the outer circumference of the tail tube 5 together are also to support the tail tube 5 and the center axis, of the cylindrical body 31 inside that looks like being divided into front and rear by a partition plate 35.

The cylindrical body 31 is mounted on the tail tube 5 with its long axis direction arranged vertically.
Then, as shown in FIG. 5, a water holding exhaust pipe 33 is fixed to the outer periphery of the tail tube 5 by fastening a fixture such as a clamp 41 to the outer periphery of the flange portion 40 that contacts the outer periphery of the tail tube 5. The front end portion of the cylindrical body 31 is cut obliquely in consideration of the workability of tightening / removing the clamp 41.
Moreover, although not shown in figure, by providing the slit in the flange part 40 in the front-back direction of the cylindrical body 31 , fixation by the clamp 41 becomes stronger.
As shown in FIG. 3, the depression at the lower side of the exhaust discharge port 7 in the cylindrical body 31 formed by the bent portion 37 and the partition plate 35 functions as a water holding portion 43 for water flowing out from the exhaust discharge port 7. It is supposed to be.

Since the water holding the exhaust pipe 33 according to this embodiment is constructed as this, the attachment of the water holding the exhaust pipe 33 to the tail tube 5, the front end side of the cylindrical body 31 as shown in FIG. 3 is passed through the tail tube 5 into the insertion hole 38 from, it may be tightening clamp 41 on the outer periphery of the flange portion 40 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 adhering to the inner periphery of the tail tube 5 flows out of the exhaust outlet 7 together with water. However, if the water holding exhaust pipe 33 is attached to the tail tube 5 as described above, The water flowing out from the exhaust outlet 7 is held in the water holding part 43 in the cylinder 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.

And when the water holding part 43 becomes dirty by 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 may be removed. For disposal, the clamp 41 is loosened and the water holding exhaust pipe 33 is removed from the tail tube 5.
Further, since the inside of the cylindrical body 31 is partitioned back and forth by the partition plate 35 , dust and water entering from the front end side of the cylindrical body 31 are shielded by the partition plate 35 , and these are blocked by the water holding portion 43 . There is no accumulation.

As described above, by attaching the water holding exhaust pipe 33 according to the present embodiment to the tail tube 5, even if water generated by the oxidation catalyst flows out from the exhaust outlet 7 of the tail tube 5, the water contaminates the ground. It was possible to prevent this.
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.
Further, in the vehicle mounting state, as shown in FIG. 5, there may be a body guard such as a side guard 45 in the vicinity of the exhaust outlet 7 of the tail tube 5. By laying the long axis direction up and down using the cylindrical body 31, the water holding exhaust pipe 33 is laid out with a sufficient clearance between the side guard 45 and other peripheral structures. And has the advantage that the amount of water that can be held in the water holding portion 43 can be increased.

FIG. 3 is an overall perspective view of a tail tube equipped with a water holding exhaust pipe according to an embodiment of claim 1 . 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 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. Conventional structure of muffler with built-in oxidation catalyst and tail tube connected to it It is a whole perspective view. Conventional structure of muffler with built-in oxidation catalyst and tail tube connected to it It is a side view.

Explanation of symbols

1 Muffler with built-in oxidation catalyst 3 Tail pipe 5 Tail tube 7 Exhaust outlet
31 cylinder 33 water holding exhaust pipe 35 partition plate 37 bent portion
38 insertion hole
39, 40 flange
41 clamp
43 Water retaining part 45 Side guard

Claims (1)

Exhaust for water retention comprising a cylindrical body that 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 via a single partition plate and spaced from the outer periphery of the tail tube. A tube,
The cylindrical body is formed in an elliptical cross section having a diameter larger than that of the tail tube, and the major axis direction is arranged vertically, and a bent portion that is bent inward is formed at the rear end portion to retain water inside. Part is provided,
The partition plate is configured to partition the cylindrical body into front and back, and an insertion hole for the tail tube is opened at a substantially center of the partition plate .

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