DE10209577B4 - Silencer with catalytic converter - Google Patents

Abstract

A muffler with a catalytic converter, in which a muffler housing (20, 120), which is connected to an exhaust pipe (16, 116), by means of separators (27, 28, 127, 128) into a plurality of expansion chambers (30, 31, 32, 130, 131 , 132), said expansion chambers (30, 31, 32; 130, 131, 132) communicating via a plurality of connecting tubes (47, 51, 54; 147, 151) connected to said separators (27, 28, 127 , 128), wherein a catalyst unit (CU) having a housing (40; 140) communicating with the exhaust pipe (16,116) is provided in the muffler housing (20; 120), and wherein the detoxified exhaust gas is in the air is released after the exhaust gas flowing into the muffler housing (20, 120) has been detoxified by the catalyst unit (CU) and the noise is detected by the expansion chambers (30, 31, 32, 130, 131, 132) and Connecting tubes (47, 51, 54, 147, 151) has been reduced; characterized in that
the catalyst unit (CU) with play in the silencer housing ...

Description

The The present invention relates to a muffler a catalyst, and in particular a silencer with a catalyst connected to an exhaust pipe of an internal combustion engine for a Motorcycle is connected.

So far, an exhaust system for an internal combustion engine of a motorcycle is known, which is provided with a so-called muffler with a catalyst in which a connected to an exhaust pipe muffler housing is divided by separators into a plurality of expansion chambers, said chambers via a plurality of connecting pipes, each through the separators are supported, a catalyst unit, which is in communication with the exhaust pipe, is provided in the muffler housing, and the detoxified exhaust gas is discharged into the air, after pollutants in the exhaust gas flowing into the muffler housing, have been detoxified by the catalyst unit and the sound has been reduced by means of the expansion chambers and the connecting pipes (see, for example, Published Unexamined Japanese Patent Application Nos. 2 and 5). JP 10-311 214 A , No. JP 2-61 312 A and no. JP 6-10 658 A ).

at the conventional one Type of muffler with catalyst, however, 1) the catalyst unit through the muffler housing via a dedicated support and the like, or 2) supports only one side of the catalyst unit from the exhaust pipe in the muffler housing, wherein however, in case 1), since the number of parts is increased, the cost increases and also the catalyst housing and the muffler housing, the each have significantly different temperatures, a thermal assume constant state and are sensitive to heat, which is more special Consideration needs, and in case 2) the support structure the catalyst unit causes vibrations and noises and the catalyst housing and the muffler housing one thermally constant state as in the case 1) assume when the catalyst unit and the muffler housing in contact are, and heat sensitive are what to take special account of is.

From the DE 40 40 721 A1 a silencer with catalyst according to the preamble of claim 1 is known. There sits the catalyst in the exhaust pipe coming from the engine, which is spatially followed by a subdivided by separators muffler.

From the US 40 94 644 It is known to put in a silencer a catalyst on connecting pipes, which are attached to different separators.

It is therefore the object of the invention to provide a silencer to provide a catalyst which solves the problems of the prior art mentioned above Technique eliminated.

Around to solve this task the invention is based on a generic silencer with a catalyst with the characterizing features of claim 1. Since the catalyst unit by supports the connecting pipes is, through which the exhaust gas flows, i.e. by a functional part of the muffler itself, is not a separate Element for supporting the catalyst unit required, reducing the number of parts of the shock absorber can be reduced with catalyst. As the catalyst unit not by being at different temperatures Silencer housing is supported, and also there is a margin between the catalyst unit and the muffler housing is the thermal stress due to thermal expansion of the support element reduces and the deformation of the catalyst unit due The thermal stress is reduced if possible. Further away the connecting pipe supports the catalyst unit can have a resonant frequency be reduced, the vibrations are prevented and the exhaust noise can also be reduced.

There the exhaust pipe connected to the catalyst unit and the Catalyst unit holding connecting pipe are supported by the same separator, is a thermal stress on the exhaust pipe, the catalyst unit and the connecting pipes acts, reduces and can their deformation due to the heat be minimized.

Prefers the catalyst unit is supported by a plurality of connecting pipes, so that support the catalyst unit can be made even more stable.

in the The invention will be explained in more detail with reference to drawings. In show the drawings:

1 a side view showing the entire motorcycle with pedals, on which a muffler is mounted with a catalyst according to the invention;

2 an enlarged view that forms part of the 1 shows; s

3 a plan view, taken along a line 3-3 in 2 ;

4 a longitudinal side view showing the silencer with catalyst;

5 a sectional view taken along a line 5-5 in 4 ;

6 a sectional view taken along a line 6-6 in 4 ;

7 a sectional view taken along a line 7-7 in 4 ;

8th a longitudinal side view showing a silencer with catalyst according to the invention;

9 a sectional view taken along a line 9-9 in 8th ;

10 a sectional view taken along a line 10-10 in 8th ;

11 a sectional view taken along a line 11-11 in 8th ,

The first and second embodiments disclose a case where a muffler with a catalyst according to the invention is applied to an internal combustion engine that is attached to a motorcycle is mounted with pedals, wherein positions such. up down, right, left, front and back, in the following description refer to the direction of travel of a motorcycle.

First, with respect to the 1 to 7 the first embodiment of the invention described.

1 is a side view showing the entire motorcycle with pedals, on which a muffler is mounted with a catalyst according to the invention. 2 is an enlarged view showing a section in 1 shows. 3 is a plan view along the line 3-3 in 2 , 4 is a longitudinal side view showing the silencer with catalyst. 5 is a sectional view taken along a line 5-5 in 4 , 6 is a sectional view taken along a line 6-6 in 4 , 7 is a sectional view taken along a line 7-7 in 4 ,

As in the 1 to 3 shown is a body frame F, which forms the skeleton of the motorcycle with pedals, with a main frame 1 provided that a head pipe 2 has at the front end and is inclined at the rear end downwards, and a seat post 3 extending from the rear end of the main frame 1 extends upwards.

A front fork 4 is through the head pipe 2 supported, so that the front fork can be steered, with a front wheel WF at the lower end of the front fork 4 is supported and a handlebar handlebar 5 at the top of the front fork 4 is provided.

A support tube 7 with a saddle 6 at the top, on which a driver can sit, is in the seat column 3 used from above and on the seat post 3 fixed so that the position of the support tube 7 can be adjusted vertically.

An internal combustion engine unit EU is integrated in the rear part of the main frame 1 by means of a clamp 8th Hung, being a gearbox 12 , which extends to the rear, in a crankcase 9 the internal combustion engine unit EU is integrated, a rear wheel WR in the rear part of the transmission housing 12 supported, the output of the engine unit EU via a transmission mechanism 13 in the gearbox 12 is provided, is transmitted to the rear wheel WR, and wherein if a driver on the saddle 6 in the pedal pair consisting of right and left crank pedal 14 occurs provided on the engine unit EU, the leg power is transmitted.

A cylinder 10 the engine unit EU is inclined upward toward the rear part of the body frame F with an exhaust port 15 on the left side of the cylinder head of the cylinder 10 is provided and an exhaust system EX, which is provided with the muffler MU with catalyst according to the invention, with the exhaust port 15 connected is. An exhaust pipe 16 , whose upstream end with the exhaust port 15 is connected, extends down into the transmission housing 12 After the exhaust pipe is slightly extended backwards, with the downstream part with an input 25 of the muffler MU is in communication with the catalyst on the right side of the rear wheel WR in a direction of the body frame transverse to the bottom of the transmission case 12 is arranged.

With reference to the 3 to 7 In the following, the structure of the muffler MU with catalyst according to the invention will be described.

The muffler MU with catalytic converter extends on the right side of the rear wheel WR in the direction of the body frame. A silencer housing 20 of the muffler MU is made of a steel plate clad with fused aluminum, with flanges 21f and 22f at the respective edge of the open ends of the right and left housing halves 21 and 22 connected, caulked and sealed, so that the interior is hollow, an approach 23 is in the flanges 21f and 22f integrated, which alternately with the upper edge of the muffler housing 20 are connected, in a state in which the approach is directed upward and integrated under the transmission housing 12 is suspended.

The entrance 25 is at the front end of the muffler housing 20 arranged, with an output 26 is arranged at the bottom of the rear part, the downstream part of the exhaust pipe 16 that with the exhaust connection 15 the engine unit EU is connected to the input 25 the Schalldämpfergehäu ses 20 is inserted, and the peripheral portion with the entrance 25 welded and attached to it. The downstream part of the exhaust pipe 16 extends to near the rear end of the muffler housing 20 where an input 44 a catalyst housing 40 a catalyst unit CU, which will be described later, connected to the downstream end.

The respective peripheral surfaces of the plate-shaped front and rear separators 27 and 28 extend in a direction perpendicular to the longitudinal direction and are formed by corresponding inner surfaces on the front half and the rear half of the muffler housing 20 supported, so that the separators can not move, with the silencer housing 20 in front, middle and rear expansion chambers 30 . 31 and 32 in order from front to back using the front and rear separators 27 and 28 is divided.

As in 4 shown, the downstream part of the exhaust pipe extends 16 to the rear of the muffler housing 20 and pierces the center in a horizontal direction in the respective upper parts of the front and rear separators 27 and 28 and is each on the separators 27 and 28 in 33 and 34 caulked.

In the rear expansion chamber 32 of the muffler housing 20 is the metallic catalyst unit CU for purifying the exhaust gas with clearance between the catalyst unit and the muffler housing 20 taken, the catalyst housing 40 the catalyst unit CU is cylindrically formed by caulking the flanges 41f and 42f at the edges of the corresponding open sides of the right and left case halves 41 and 42 wherein a cylindrical metallic catalyst carrier 43 supported by a catalyst therein via a cushion. The front of the catalyst housing 40 is beveled forward, with the entrance 44 is at the front end, and wherein the downstream end of the exhaust pipe 16 in the entrance 44 used and welded, and an output 45 the catalyst unit CU rearwardly into the rear expansion chamber 32 opens.

The front and rear expansion chambers 30 and 32 stand alternately over a first connecting pipe 47 in connection made of a carbon steel. The first connecting pipe 47 pierces the right sides of the corresponding lower parts of the front and rear separators 27 and 28 and is each on the separators 27 and 28 in 48 and 49 caulked, with the exhaust gas in the rear expansion chamber 32 over the first connecting pipe 27 into the anterior expansion chamber 30 is directed. The front and middle expansion chambers 30 and 31 stand alternately over a second connecting pipe 51 in conjunction, which is made of a carbon steel tube. The second connecting pipe 51 pierces the left side of the lower part of the front separator 27 , is at the front separator 27 in 33 caulked, with the exhaust gas in the front expansion chamber 30 over the second connecting pipe 51 in the middle expansion chamber 31 is directed. Furthermore, the middle expansion chamber 31 via a third connecting pipe 54 , which is similarly made of a carbon steel tube, in communication with the outside air. The front of this third connecting pipe 54 pierces the center of the lower part of the rear separator 28 in horizontal direction, is at the rear separator 28 in 55 caulked, and is down with this in the rear expansion chamber 32 inclined extended, with the back of the exit 26 of the muffler housing 20 pierces and is welded there. The shoulder of the peripheral surface of the catalyst housing 40 is in 56 in the middle part of the third connecting pipe 54 welded, whereby the catalyst unit CU through the third connecting pipe 54 is supported. Since with respect to the catalyst unit CU upstream side of the exhaust pipe 16 and the front of the third connecting pipe 54 both from the same rear separator 28 are supported (caulked in 34 and 55 ), the distance between the corresponding supported parts and the welded part 56 can be substantially compensated, whereby a thermal stress acting on each part, can be reduced compared to a conventional housing, wherein the catalyst unit CU means of the muffler housing 20 is supported, which has a very different temperature from the catalyst unit, as a result, a thermal deformation in the exhaust pipe 16 , the third connecting pipe 54 and the catalyst housing 40 is caused, if possible can be reduced.

On much of the inner surface of the muffler housing 20 is glass wool 58 arranged as sound insulation material, wherein the exposed surface of the glass wool 58 with an inner plate 59 covered, in the several small holes 60 are formed, and with the inner surface of the muffler housing 20 connected is.

In the following, the effect of the first embodiment will be explained. When the engine unit EU is operated, the exhaust gas generated by the combustion of fuel becomes out of the exhaust port 15 over the exhaust pipe 16 in the catalyst unit CU in the muffler housing 20 directed. The exhaust gas flowing into the catalyst unit CU comes into contact with a catalyst, whereby pollutants contained in the exhaust gas, such as HC and CO, are detoxified and eliminated. The detoxified exhaust gas passes through the outlet 45 the catalyst unit CU in the rear expansion chamber 32 a, enters via the first connecting pipe 47 into the anterior expansion chamber 30 A, enters via the second connecting pipe 51 in the middle expansion chamber 31 a, and is further on the third connecting pipe 54 released into the outside air. Over time, the exhaust gas is repeatedly expanded and reduced, with its exhaust sound energy being absorbed and absorbed when in contact with the glass wool 58 comes in contact, and the noise is effectively reduced.

When the catalyst unit CU passes through the third connection pipe 54 is supported by which the exhaust gas flows, that is, by a functional component of the muffler, no dedicated support element for supporting the catalyst unit CU is required, whereby the number of parts of the muffler MU is reduced with catalyst, the structure can be simplified, wherein the catalyst unit CU not through the muffler housing 20 is supported, which has a significantly different temperature, and in addition, since a clearance between the catalyst unit and the silencer housing 20 is present, a thermal stress due to the thermal expansion and thermal contraction of its support member is reduced and the deformation due to the thermal stress of the catalyst unit can be prevented if possible. Further, since the third connecting pipe 54 the catalyst unit supports CU, the resonance frequency of the catalyst unit can be reduced, whereby its vibrations are suppressed and the exhaust noise can be reduced.

Furthermore, since the upstream side of the exhaust pipe with respect to the catalyst unit CU 16 , which is connected to the catalyst unit CU, and the third connection pipe 54 supporting the catalyst unit CU, both through the same rear separator 28 supported, the distance between the part (the welded part 56 ) in which the third connecting pipe 54 the catalyst unit supports CU, and the other part (one of the caulked parts 34 or 55 ), in which the rear separator 28 supports, substantially the same, wherein the thermal expansion deformation for the distance in the exhaust pipe 16 and in the third connecting pipe 54 is caused and the thermal stress can be reduced.

The following is with reference to the 8th to 11 A second embodiment of the invention is described.

8th is a longitudinal side view showing the silencer with catalyst according to the invention. 9 is a sectional view taken along a line 9-9 in 8th , 10 is a sectional view taken along a line 10-10 in 8th , 11 is a sectional view taken along a line 11-11 in 8th , The same reference numerals will be used to designate the same components as in the first embodiment.

A silencer housing 120 a muffler MU with a catalyst connected to the downstream end of an exhaust pipe 116 is made of a steel plate which is clad with fused aluminum, the edges at the open ends of the upper and lower housing halves 121 and 122 whose respective cross-sections are semicircular, abutting one another, their flanges 121f and 122f caulked, the halves being shaped to be long front and rear, sealed and the interior hollow, and the interior into front, middle and rear expansion chambers 130 . 131 and 132 by means of front and rear separators 127 and 128 is divided, which are supported by the inner surface in a state in which the separators are arranged in an interval before and behind so that they can not move.

Like from the 9 and 10 becomes clear, are on the upper wall and the lower wall, respectively the front expansion chamber 130 of the muffler housing 120 are associated, diamond-shaped flat parts 135 and 136 formed symmetrically, with both ends of the alternately parallel two insertion tubes 137 in the expansion chamber 130 are provided, respectively on these flat parts 135 and 136 are attached. The downstream end of the exhaust pipe 116 is on the silencer housing 120 attached and connected thereto via suitable fasteners, for example, as in 10 shown, an insertion flange 116f , at the end of the exhaust pipe 116 is attached by means of a bolt b is attached, one of the two Ein translated pipes 137 pierces, and on which a mother n is attached.

An entrance 125 of muffler MU is on flat part 135 the top wall between the two insertion tubes 137 arranged, with an exhaust pipe on the downstream side 117 similar to an elbow with the exhaust pipe 116 communicates with the entrance 125 connected is. The exhaust pipe on the downstream side 117 is back in the front expansion chamber 130 extended, is with an entrance 144 one in the middle expansion chamber 131 connected catalyst unit CU, wherein the compound of the front separator 127 pierces, and is attached to the front separator. As in the 8th and 11 is shown in the middle expansion chamber 131 a catalyst housing 140 the catalyst unit CU formed by Verschwei Shen the Einsetzflansche 141f and 142f an upper half of the housing 141 and a lower housing half 142 , wherein the Einsetzflansche 141f and 142f are extended to the outside and two second connecting pipes 151 each welded to the flanges and attached thereto. The two second connecting pipes 151 extend parallel forward and back into the muffler housing 120 , with its two ends front and rear, the front and rear separators 127 and 128 pierced and in 152 and 153 are caulked. Thus, both sides of the catalyst unit CU are by two second connecting pipes 151 supported. The two second connecting pipes 151 each stand with the front expansion chamber 130 and the rear expansion chamber 132 in communication with the exhaust gas in the front expansion chamber 130 in the rear expansion chamber 132 is directed.

The catalyst unit CU has the same structure as that in the first embodiment, wherein a metallic catalyst carrier 143 with play in the cylindrical catalyst housing 140 is supported.

As in 8th shown pierces a short first connecting pipe 147 the center of a lower part of the front separator 127 in the horizontal direction and is caulked in 148, which is the front expansion chamber 130 and the middle expansion chamber 131 allows to communicate, and where the exhaust gas in the middle expansion chamber 131 into the anterior expansion chamber 130 is directed.

As in 8th shown is an insertion tube 138 which runs vertically, at the rear portion of the middle expansion chamber 131 provided, with the two ends of the Einsetzrohres 138 on the upper and lower walls of the muffler housing 120 are attached. The silencer housing 120 is suspended on the engine unit EU by means of suitable support means, for example, as in 8th is shown with a dashed line, the muffler housing is supported by means of a bolt b ', which is the insertion tube 138 penetrates, and a nut n ', which is attached to the bolt, by means of a support s, which is attached to the engine unit EU. A tailpipe 154 pierces an exit 126 of the muffler MU, located in a lower part of the rear wall of the catalyst housing 140 is located in 155 caulked and carries the exhaust gas in the rear expansion chamber 132 into the outside air.

in the Next, the effect of the second embodiment will be described.

The exhaust gas generated by the operation of the engine unit EU flows out of the exhaust pipe 116 over the exhaust pipe on the downstream side 117 in the catalyst unit CU. The exhaust gas, whose pollutants have been detoxified and removed, exits the middle expansion chamber 131 over the first connecting pipe 147 into the anterior expansion chamber 130 A, enters via two second connecting pipes 151 in the rear expansion chamber 132 one, and will over the tailpipe 154 released into the outside air. Over time, the exhaust gas is repeatedly expanded and reduced, with the exhaust gas sound energy is attenuated.

Since the catalyst unit CU by two second connecting pipes 151 is supported, through which flows the exhaust gas, that is, through functional parts of the muffler, no dedicated support element for supporting the catalyst unit CU is required, whereby the number of parts of the muffler with catalyst is reduced and the structure can be simplified because the catalyst unit CU not through the silencer housing 120 is supported, which is an element with a very different temperature, wherein also a clearance between the catalyst unit and the muffler housing 120 is present, so that the thermal stress due to the different thermal expansion and thermal contraction between the catalyst unit and a support member is reduced and the deformation of the catalyst due to the thermal stress can be minimized. Furthermore, there are two second connecting pipes 151 support the catalyst unit CU, its resonance frequency can be reduced, whereby their vibrations can be suppressed and the exhaust noise can be reduced, and further wherein, as the catalyst unit CU by two second support pipes 51 supported, the support strength can be improved.

The first and second embodiments The invention has been described above, but the invention is not limited to these embodiments, and various embodiments are possible within a scope of the invention. For example, in the embodiment, the case where the muffler with the catalyst according to the invention is applied to the exhaust system of the internal combustion engine of a motorcycle is described in the embodiment, but of course the catalyst-equipped muffler according to the invention may be applied to an exhaust system of another internal combustion engine. Further, in the embodiment, a metallic catalyst unit is used, however, although a catalyst used in the invention is merely a catalyst capable of detoxifying pollutants contained in the exhaust gas such as HC and CO, any catalyst can be used.

Around the number of parts of an element supporting a catalyst unit in a muffler housing one silencer with catalyst, with an exhaust system of an internal combustion engine for a Motorcycle is connected, reduce and thus the structure too simplify and thermal stress due to thermal expansion and thermal contraction reduce the catalyst unit and the support element and thus the deformation of the catalyst unit as far as possible to prevent is a catalyst unit in a silencer housing with game taken up and supported by means of a connecting pipe, the is a functional part of the muffler and attached to a separator is attached to allow exhaust gas to flow through.

16

exhaust pipe

20

muffler housing

27

separator (front separator)

28

separator (rear separator, same separator)

30

expansion chamber (front expansion chamber)

31

expansion chamber (middle expansion chamber)

32

expansion chamber (rear expansion chamber)

47

connecting pipe (first connecting pipe)

51

connecting pipe (second connecting pipe)

54

connecting pipe (third connecting pipe)

116

exhaust pipe

120

muffler housing

127

separator (front separator)

128

separator (rear separator)

130

expansion chamber (front expansion chamber)

131

expansion chamber (middle expansion chamber)

132

expansion chamber (rear expansion chamber)

147

connecting pipe (first connecting pipe)

151

connecting pipe (second connecting pipe)

CU

catalyst unit

Claims (2)

Silencer with catalytic converter, in which a silencer housing ( 20 ; 120 ), which with an exhaust pipe ( 16 ; 116 ), by means of separators ( 27 . 28 ; 127 . 128 ) into several expansion chambers ( 30 . 31 . 32 ; 130 . 131 . 132 ), the expansion chambers ( 30 . 31 . 32 ; 130 . 131 . 132 ) via a plurality of connecting pipes ( 47 . 51 . 54 ; 147 . 151 ) connected to the separators ( 27 . 28 ; 127 . 128 ) are supported, wherein a housing ( 40 ; 140 ) having catalyst unit (CU) with the exhaust pipe ( 16 . 116 ) in the muffler housing ( 20 ; 120 ) is provided, and wherein the detoxified exhaust gas is discharged into the air after the exhaust gas, which in the muffler housing ( 20 ; 120 ) has been detoxified by the catalyst unit (CU) and the noise by means of the expansion chambers ( 30 . 31 . 32 ; 130 . 131 . 132 ) and the connecting pipes ( 47 . 51 . 54 ; 147 . 151 ) has been reduced; characterized in that the catalyst unit (CU) with play in the muffler housing ( 20 ; 120 ) is included; and the catalyst housing ( 40 ; 140 ) on at least one of the separators ( 27 . 28 ; 127 . 128 ) supported connecting pipes ( 54 ; 151 ) and that in the muffler housing ( 20 ; 120 ) the exhaust pipe connected to the catalyst unit (CU) ( 16 ; 116 ) and the at least one connecting tube ( 54 ; 151 ), on which the catalyst housing ( 40 ; 140 ) is attached to the same separator ( 28 ; 127 ) are supported. Silencer with catalyst according to claim 1, characterized in that the catalyst unit (CU) through several of the connecting pipes ( 151 ) is supported.