JPH036808Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a so-called dual-type exhaust silencing device that has two tail pipes for discharging exhaust gas from an internal combustion engine into the atmosphere.

[Conventional technology]

Utility Model Application Publication No. 57-103320 as a prior art,
In a dual-type exhaust muffler having two tail pipes connected to a muffler into which exhaust gas from an internal combustion engine flows, one of the two tail pipes
The length of one tail pipe is made longer and the length of the other tail pipe is made shorter, and the opening ratio of the short tail pipe into the muffler is smaller than the opening ratio of the long tail pipe into the muffler. It is proposed that the exhaust noise be reduced without increasing the exhaust pressure of the exhaust gas.

In the case of the dual exhaust muffler disclosed in this prior art, the exhaust gas is mainly emitted into the atmosphere from the long tailpipe, and the amount of exhaust gas emitted into the atmosphere from the short tailpipe is The amount of exhaust gas emitted from the

[Problem that the invention attempts to solve]

However, in the dual exhaust muffler disclosed in this prior art, condensed water accumulates at the bottom of the muffler as the exhaust gas is cooled, while condensed water condenses in both tail pipes. If the condensed water accumulated at the bottom of the muffler flows into the long tailpipe, the amount of condensed water in the long tailpipe will increase, impeding the flow of exhaust gas. This causes the exhaust pressure to rise, reducing the output of the internal combustion engine and reducing the effectiveness of muffling exhaust noise.Especially in the winter, condensed water freezes in the long tailpipe, causing the long tailpipe to freeze. It was because it blocked the pipe.

The present invention solves the above-mentioned problems in the prior art dual exhaust muffler.

[Means for solving problems]

For this reason, the present invention connects a short tail pipe and a long tail pipe to a silencer into which exhaust gas from an internal combustion engine flows, and adjusts the opening ratio of the short tail pipe into the silencer by adjusting the opening ratio of the short tail pipe into the silencer. In a dual-type exhaust silencer, the opening of the long tail pipe into the muffler is set at a higher position than the opening of the short tail pipe into the muffler. It is configured so that

[Functions and effects of the idea]

With this configuration, the condensed water that collects at the bottom of the silencer mainly flows into the short tail pipe, reducing the amount of condensed water in the long tail pipe. It is possible to reliably prevent problems caused by the increase in exhaust gas flow, that is, a decrease in internal combustion engine output and a decrease in silencing effect due to obstruction of the flow of exhaust gas, and also to reliably prevent long tail pipes from freezing and clogging in the winter. It has the effect of

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.
Inside is an internal combustion engine (not shown) installed in a car.
a first expansion chamber 3 to which an exhaust pipe 2 from the
A second expansion chamber 5 communicates with the first expansion chamber 3 through a communication pipe 4, and a large number of small holes 6 are provided in the exhaust pipe 2.
A low frequency resonance chamber 8, which communicates with the second expansion chamber 5 through a communication pipe 7, is defined by two partition plates 9 and 10.

In this case, the muffler 1 is tilted rearward and diagonally upward by an appropriate angle θ with respect to the horizontal plane so that the rear of the muffler 1 is higher than the front when viewed from the side of the vehicle, as shown in FIG. There is.

11 indicates a short tail pipe, and 12 indicates a long tail pipe, and the long tail pipe 12 has a U shape in plan view as shown in FIG.
The inlet end 12a thereof is connected and opened into the second expansion chamber 5 of the muffler 1, while the inlet end 11a of the short tail pipe 11 is bent in the shape of a letter.
is provided with a blind lid 13 and inserted into the second expansion chamber 5 of the muffler 1, and this inlet end 11
In a, the inlet end 12 of the long tail pipe 12 is shown.
A plurality of small holes 14 having an aperture ratio smaller than that of a are bored.

Although not shown, a short tail pipe 11
The outlet end of the long tailpipe 12 opens to the atmosphere on one side at the rear of the vehicle, and the outlet end of the long tailpipe 12 opens to the atmosphere on the other side at the rear of the vehicle.

and the inlet end 1 of the long tail pipe 12.
2a is located above the inlet end 11a of the short tail pipe 11 by an appropriate height H, as shown in FIG. That is, the opening of the long tail pipe 12 into the muffler 1 is configured to be at a higher position than the opening of the short tail pipe 11 into the muffler 1.

Therefore, condensed water accumulates at the bottom of the muffler 1 as the exhaust gas is cooled, but this condensed water passes through the opening in the muffler 1 of the long tail pipe 12 to the short tail pipe 11. By configuring it to be located at a higher position than the opening into the muffler 1, the condensed water flowing into the long tail pipe 12 can be reduced because it flows through the short tail pipe 11 and flows out.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan cross-sectional view of a silencer, and FIG. 2 is an enlarged cross-sectional view taken from the side of FIG. 1. 1... Silencer, 2... Exhaust pipe, 3... First expansion chamber, 5... Second expansion chamber, 8... Low frequency resonance chamber,
11...Short tailpipe, 12...Long tailpipe.

Claims (1)

[Scope of utility model registration request] A silencer into which exhaust gas from an internal combustion engine flows,
A dual type exhaust silencer comprising a short tailpipe and a long tailpipe with a connecting opening, and the opening ratio of the short tailpipe into the muffler is set smaller than the opening ratio of the long tailpipe into the muffler. A dual-type exhaust silencer for an internal combustion engine, characterized in that the opening of the long tailpipe into the muffler is located at a higher position than the opening of the short tailpipe into the muffler. .