U.S. patent application number 09/816618 was filed with the patent office on 2002-09-26 for structure of a muffler at the rear of exhaust pipe.
Invention is credited to Chen, Shun-Lai.
Application Number | 20020134614 09/816618 |
Document ID | / |
Family ID | 25221142 |
Filed Date | 2002-09-26 |
United States Patent
Application |
20020134614 |
Kind Code |
A1 |
Chen, Shun-Lai |
September 26, 2002 |
Structure of a muffler at the rear of exhaust pipe
Abstract
The present invention discloses an improved structure of a
muffler at the rear end of an exhaust pipe, mainly comprising a
tapered inner pipe inside a tapered conical outer pipe, and a
plurality of silencing holes being disposed on the wall of the
inner pipe, and a silencing cotton wrappers around and covers the
external rim of the inner pipe, and a sleeve being disposed in the
inner pipe proximate to the rear end of the inner pipe. The front
end of such sleeve is a tapered conical pipe, and the rear end
slight extends to the outside of the rear end of the external pipe.
A decorative lid covers the rear end surface of the external pipe,
and a gas-receiving pipe having a French connector being soldered
to the front end of the external pipe, and an n-shaped fixing
bracket having a fixing hole on it being soldered to an appropriate
position on the external surface of the external pipe proximate to
the rear end. The assembly of the foregoing components enables the
muffler to increase the output torque of the engine, reduce the
noise, and provides an easy installation for all sorts of
vehicles.
Inventors: |
Chen, Shun-Lai; (Chang Hua
Hsien, TW) |
Correspondence
Address: |
PRO-TECHTOR INTERNATIONAL
20775 Norada Court
Saratoga
CA
95070-3018
US
|
Family ID: |
25221142 |
Appl. No.: |
09/816618 |
Filed: |
March 23, 2001 |
Current U.S.
Class: |
181/252 ;
181/256 |
Current CPC
Class: |
F01N 1/24 20130101; F01N
2470/30 20130101; F01N 2450/24 20130101; F01N 1/006 20130101; F01N
13/20 20130101 |
Class at
Publication: |
181/252 ;
181/256 |
International
Class: |
F01N 001/10 |
Claims
What is claimed is:
1. A muffler structure at the rear end of an exhaust pipe, mainly
comprising a converging tapered external pipe disposed in a
diverging tapered inner pipe; a plurality of densely distributed
silencing holes being disposed on the wall of said inner pipe; a
silencing cotton being wrapped around the external edge of the
inner pipe; a sleeve being coupling to the internal edge proximate
to the rear end of the inner pipe; and a converging tapered conical
pipe opening at the front end of said sleeve; and the rear end
slightly extends outside the rear edge surface of the external
pipe.
2. A muffler structure at the rear end of an exhaust pipe as
claimed in claim 1, wherein the front end of said external pipe
being mounted to a gas-receiving pipe with a French connector, and
the diameter of the opening of the gas-receiving pipe is smaller
than the diameter of the opening at the front end of the inner
pipe.
3. A muffler structure at the rear end of an exhaust pipe as
claimed in claim 1, wherein the external wall of said external pipe
proximate to an appropriate position at its rear end being soldered
with an n-shaped fixing bracket.
4. A muffler structure at the rear end of an exhaust pipe as
claimed in claim 1, wherein the rear edge surface of said external
pipe being coupled to a decorative lid, and the center of said
decorative lid forming an diverging conical hole, and a ringed
groove being disposed in an appropriate depressed position of the
decorative lid, and the ringed groove having a penetrating hole,
thereby a screw being mounted to the soldered nut at the rear edge
of the external pipe.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an improved structure of a
muffler at the rear end of an exhaust pipe, more particularly to a
muffler comprising a tapered inner pipe inside a tapered conical
outer pipe, and further having a tapered sleeve being disposed in
the inner pipe proximate to the rear end of the inner pipe to
increase the output torque of the engine and reduce the noise, and
by the design of a gas-receiving pipe with a French connector being
soldered to the front end of the external pipe, and an n-shaped
fixing bracket being soldered to the external pipe to provide an
easy installation for all sorts of vehicles.
[0003] 2. Description of the Related Art
[0004] The conventional muffler used for the exhaust pipe of
vehicles has existing shortcomings or inferior designs. Please
refer to FIG. 1 for the prior art mufflers. The inner pipe having
silencing holes is disposed inside the outer pipe, and the
silencing cotton is being wrapped around the wall of the inner
pipe. However, the shortcoming of this design is not able to
enhance the torque of the engine, and since the airflow directly
collides on the pipe wall to generate a larger noise. Furthermore,
it needs to preinstall by soldering a connecting pipe and
positioning bar according to the specification of a specific
vehicle model at the front end and external surface of the external
pipe. It makes the installation difficult, time-consuming, and
waste of labor.
[0005] In summation of the above description about the prior art
waiting for a breakthrough, the present inventor herein enhances
the performance of the conventional structure by performing
research and development to increase the torque output of the
engine, reduce the noise, and provides easy installation for all
sorts of vehicles.
SUMMARY OF THE INVENTION
[0006] The main objective of this invention is to provide an
improved structure of a muffler at the rear of the exhaust pipe,
which utilizes the coupling of the tapered conical shape of the
external pipe and the tapered inner tape and the densely
distributed silencing holes on the wall of the inner pipe, in
addition to the silencing cotton wrapped around the external side,
and a tapered sleeve being installed to the internal rim at the
rear end of the inner pipe to form an appropriate backpressure in
order to enhance the torque output of the engine.
[0007] The secondary objective of the present invention is to
provide an improved structure of a muffler at the rear of the
exhaust pipe, which utilizes a tapered inner pipe and a tapered
sleeve at the internal rim proximate to the rear end of the inner
pipe to accelerate the airflow. The distance between the inner pipe
and the external pipe gradually increases thereby reduce the noise
generated by airflow collision on the external pipe.
[0008] Another objective of the present invention is to provide an
improved structure of a muffler at the rear of the exhaust pipe,
which uses a design of a gas-receiving pipe with a French connector
and an n-shaped bracket located at an appropriate position on the
external side at the rear end of the external pipe to facilitate
the installation for different types of vehicles.
[0009] To make it easier for our examiner to understand the
objective of the invention, its structure, innovative features, and
its performance, we use a preferred embodiment together with the
attached drawings for the detailed description of the
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Other objects, features, and advantages of the invention
will become apparent from the following detailed description of the
preferred but non-limiting embodiment. The description is made with
reference to the accompanying drawings, in which:
[0011] FIG. 1 illustrates the cross-section of the conventional
muffler at the rear of the exhaust pipe.
[0012] FIG. 2 illustrates the three-dimensional appearance of the
conventional muffler at the rear of the exhaust pipe.
[0013] FIG. 3 illustrates the three-dimensional appearance of the
muffler at the rear of the exhaust pipe according to the present
invention.
[0014] FIG. 4 is a three-dimensional diagram illustrating a part of
the cross-section of the muffler at the rear of the exhaust pipe
according to the present invention.
[0015] FIG. 5 is a three-dimensional diagram illustrating the
cross-section of the muffler at the rear of the exhaust pipe
according to the present invention.
[0016] FIG. 6 is a three-dimensional diagram illustrating the
installation of a preferred embodiment according to the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0017] Please refer to FIGS. 4 and 5 for an improved structure of a
muffle at the rear of the exhaust pipe according to the present
invention. The muffler at the rear of the exhaust pipe comprises an
external pipe 1, an inner pipe 2, a sleeve 3, a gas-receiving pipe
4, a decorative lid 5, and an n-shaped fixing bracket 6. The
detailed structure is described below:
[0018] The external pipe 1 is a hollow ascending tapered pipe,
having a gas-receiving pipe 4 with a French connector 41 soldered
to the front end of the external pipe 1. The internal rim of the
external pipe 1 has an opening equal in internal diameter with that
of the tapered inner pipe 2. The wall of the inner pipe 2 has a
plurality of densely distributed silencing holes 21, and a
silencing cotton 7 being wrapped around the external edge of the
inner pipe 2. A sleeve 3 having a conical pipe opening 31 is
disposed at the internal edge proximate to the rear end of the
inner pipe 2, and the diameter of the opening of the sleeve 3
exactly fits into wall hole at the inner edge surface of the inner
pipe 2. The end of the sleeve 3 slightly passes through the edge
surface 11 at the rear end of the external pipe 1, and a decorative
lid 5 covers the rear edge surface 11 of the external pipe 1. The
center of such decorative lid 5 forms a diverging conical hole 51
that exactly fits the rear end of the sleeve 3 into the central
conical hole 51, and an appropriate part of the decorative lid 5
being latched into a ringed groove 52. The ringed groove 52 has
penetrating holes 520 for mounting the rear edge surface 11 of the
external pipe 1 to the corresponding position of the soldered nuts
110 by the screws 53.
[0019] Please refer to FIG. 5 for the structural function of the
present invention. When the waste gas enters the gas-receiving pipe
4 having a French connector 41 of the inner pipe 2, due to the
larger cross-sectional area of the front end opening of the inner
pipe 2, the airflow will slow down to fill up and then accelerate
according to the tapered shape of the inner pipe 2. The airflow is
affected by the tapered end of the sleeve 3 proximate to its rear
end opening; it produces an appropriate backpressure to increase
the torque output of the engine. Furthermore, the airflow in the
inner pipe 2 accelerating in the external pipe 1 with opposite
tapered direction can reduce the noise produced by the airflow
collision on the external pipe 1.
[0020] The assembly of the present invention as shown in FIG. 6 has
an n-shaped fixing bracket 6 being soldered to an appropriate
position at the rear section proximate to the external side of the
external pipe 1. Such n-shape fixing bracket 6 has a plurality of
fixing holes 61 to mount the bar 8 onto the fixing bracket 6. The
gas-receiving pipe 4 having a French connector 41 at the front end
of the external pipe can be coupled to different types of
connecting pipes 9. It makes the installation of the present
invention much easier, and is unlike the inconvenient prior art
technology that needs to solder the fixing bar and connecting pipe
9 to the muffler.
[0021] In summation of the above description, the present invention
herein overcomes the shortcomings of the conventional mufflers and
further complies with the patent application requirements and is
submitted to the Patent and Trademark Office for review and
granting of the commensurate patent rights.
[0022] While the invention has been described by way of example and
in terms of a preferred embodiment, it is to be understood that the
invention is not limited thereto. To the contrary, it is intended
to cover various modifications and similar arrangements and
procedures, and the scope of the appended claims therefore should
be accorded the broadest interpretation so as to encompass all such
modifications and similar arrangements and procedures.
* * * * *