DE10209577A1 - Silencer for motorcycle engines comprises a silencer housing connected to an exhaust gas pipe and divided by separators into expansion chambers - Google Patents

Abstract

Silencer comprises a silencer housing (20) connected to an exhaust gas pipe (16) and divided by separators (27, 28) into expansion chambers (30, 31, 32). The chambers are joined together by connecting pipes (47, 51, 54) which are supported by the separators. A catalyst unit (CU) is connected to the exhaust gas pipe in the housing. Decontaminated air is released into the air after the exhaust gas which flows into the housing has been decontaminated by the catalyst unit. Preferred Features: The catalyst unit is supported by several connecting pipes.

Description

The present invention relates to a silencer with a Catalyst, and in particular on a silencer with a catalytic converter Tor with an exhaust pipe of an internal combustion engine for a motorcycle connected is.

So far, an exhaust system for an internal combustion engine of a motorcycle known that with a so-called silencer with a catalyst is provided, in which a muffler connected to an exhaust pipe housing is divided into several expansion chambers by means of separators, the chambers via several connecting pipes, each through the Separators are supported, communicating, a catalyst unit, which is connected to the exhaust pipe, in the silencer housing is provided, and the detoxified exhaust gas is released into the air after the pollutants in the exhaust gas that flows into the muffler housing from the catalyst unit have been detoxified and the sound by means of Expansion chambers and the connecting pipes has been reduced (see z. B. the published unexamined Japanese patent applications No. Hei 10-311214, No. Hei 2-61312 and No. Hei 6-10658).

However, in the conventional type of silencer with a catalyst, 1) the catalytic converter unit through the silencer housing via a dedicated Support and the like, or 2) only one side of the catalyst Unit supported by the exhaust pipe in the silencer housing, but in Case of 1), since the number of parts is increased, the cost increases and also the catalytic converter housing and the muffler housing, the each have significantly different temperatures, one thermally assume constant state and are sensitive to heat, whereby the The problem is that special consideration is required; and where in the case of 2), since the support structure of the catalyst unit Schwin and noise, the catalytic converter housing and the sound damper housing assumes a thermally constant state as in case 1) men when the catalyst unit and the muffler housing in contact are, and are susceptible to heat, the problem being that a special Consideration is required.  

It is therefore the object of the invention to provide a new type of muffler to create a catalyst that the above mentioned problems of State of the art eliminated.

In order to achieve this object, the invention is based on one Silencer with a catalytic converter, in which a silencer housing, which is connected to one exhaust pipe, by means of separators into several Expansion chambers is divided, the expansion chambers with several connecting pipes supported by the separators in Verbin stand, a catalyst unit connected to the exhaust pipe stands, is provided in the silencer housing, and the detoxified exhaust gas in the air is released after that into the muffler housing flowing exhaust gas has been detoxified by means of the catalyst unit and the Sound is reduced by means of the expansion chambers and the connecting pipes has been, and whereby the muffler with catalyst characterized is that the catalyst unit with play in the muffler housing is added and the catalyst housing by at least one on Separator-attached connecting pipe is supported. Because according to one such property, the catalyst unit through the connecting pipes is supported through which the exhaust gas flows, i.e. H. through a functional part of the Silencer itself, is not a dedicated support element to Support the catalyst unit required, reducing the number of Parts of the silencer with catalytic converter can be reduced as the The catalytic converter unit is not supported by the silencer housing has a very different temperature, and also between the Catalyst unit and the muffler housing a margin is, the thermal stress due to thermal expansion of the support element is reduced and the deformation of the catalytic converter Gate unit due to thermal stress if possible is reduced. Furthermore, since the connecting pipe under the catalyst unit supports, a resonance frequency can be reduced, the oscillation can be prevented and the exhaust noise can also be reduced can.

In order to achieve the object, the invention is further based on claim 2  of the invention according to claim 1 and is characterized in that in Exhaust pipe connected to the catalytic converter unit and the connecting pipe supporting the catalyst unit through the same separator are supported, according to such a property in addition to the effect of the invention according to claim 1 a thermal Stress on the exhaust pipe, the catalyst unit and the Connecting pipes acts, is reduced and their deformation due to Heat can be minimized.

In order to achieve the object, the invention is further based on claim 3 of the invention according to claim 1 and is characterized in that the Catalyst unit is supported by several connecting pipes, wherein according to such a property in addition to the effect of the invention Claim 1 increased the support strength of the catalyst unit can be.

The invention is explained in more detail below with reference to drawings. In show the drawings

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

Fig. 2 is an enlarged view showing part of Fig. 1;

Fig. 3 is a plan view viewed along a line 3-3 in Fig. 2;

Fig. 4 is a longitudinal side view showing the silencer with a catalyst;

Fig. 5 is a sectional view taken along a line 5-5 in Fig. 4;

Fig. 6 is a sectional view taken along a line 6-6 in Fig. 4;

Fig. 7 is a sectional view taken along a line 7-7 in Fig. 4;

Fig. 8 is a longitudinal side view according to the invention shows a silencer with catalytic converter;

Fig. 9 is a sectional view taken along a line 9-9 in Fig. 8;

Fig. 10 is a sectional view taken along a line 10-10 in Fig. 8;

Fig. 11 is a sectional view taken along a line 11-11 in Fig. 8;

The first and second embodiments disclose a case where one Silencer with a catalyst according to the invention on one Internal combustion engine is applied to a motorcycle with pedals is mounted, positions such. B. top, bottom, right, left, front and rear, in the following description of the direction of travel of a motorcycle of the reference.

First, the first embodiment of the invention will be described with reference to FIGS. 1 to 7.

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

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

A front fork 4 is supported by the head tube 2 so that the front fork can be steered, a front wheel WF is supported at the lower end of the front fork 4 and a handlebar 5 is provided at the upper end of the front fork 4 .

A support tube 7 with a saddle 6 at the upper end, on which a driver can sit, is inserted into the seat column 3 from above and fixed to the seat column 3 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 bracket 8 , a gear housing 12 , which extends rearwards, is integrated into a crankcase 9 of the combustion engine unit EU, a rear wheel WR in the rear part of the gear housing 12 supports is, the output power of the internal combustion engine unit EU via a gear mechanism 13 , which is provided in the transmission housing 12 , is transmitted to the rear wheel WR, and when a driver on the saddle 6 enters the pair of pedals consisting of right and left crank pedals 14 , which are provided on the internal combustion engine unit EU, the leg force is transmitted.

A cylinder 10 of the internal combustion engine unit EU is inclined upwards towards the rear part of the body frame F, an exhaust port 15 being provided on the left side of the cylinder head of the cylinder 10 and an exhaust system EX provided with the silencer MU with catalytic converter according to the invention is connected to the exhaust port 15 . An exhaust pipe 16 , the upstream end of which is connected to the exhaust connection 15 , extends downward into the transmission housing 12 after the exhaust pipe is extended somewhat to the rear, the downstream part being connected to an inlet 25 of the muffler MU with catalyst, which is arranged on the right side of the rear wheel WR in a direction of the body frame transversely to the bottom of the transmission housing 12 .

With reference to FIGS. 3 to 7, the structure of the muffler MU with catalyst according to the invention is described below.

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

The inlet 25 is arranged at the front end of the muffler housing 20 , an outlet 26 being arranged at the bottom of the rear part, the downstream part of the exhaust pipe 16 , which is connected to the exhaust gas connection 15 of the internal combustion engine unit EU, inserted into the inlet 25 of the muffler housing 20 and the peripheral portion is welded to and fixed to the entrance 25 . The downstream part of the exhaust pipe 16 extends to the vicinity of the rear end of the muffler housing 20 , with an inlet 44 of a catalyst housing 40 of 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 supported by corresponding inner surfaces on the front half and the rear half of the silencer housing 20 , so that the separators cannot move, the silencer housing 20 is divided into front, middle and rear expansion chambers 30 , 31 and 32 in the order from front to back by means of the front and rear separators 27 and 28 .

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

In the rear expansion chamber 32 of the muffler housing 20 is the metallic catalyst unit CU for cleaning the exhaust gas with play between the catalyst unit and the muffler housing 20 be taken, wherein the catalyst housing 40 is formed of the catalyst unit CU cylindrical, f by caulking the flanges 41 and 42 f on the edges of the corresponding open sides of the right and left housing halves 41 and 42 , wherein a cylindrical metallic catalyst carrier 43 is supported with a catalyst therein via a cushion. The front of the catalyst housing 40 is chamfered to the front, with the inlet 40 being at the front end, and with the downstream end of the exhaust pipe 16 being inserted and welded into the inlet 44 , and an outlet 45 of the catalyst unit CU toward the rear into the rear expansion chamber 32 opens.

The front and rear expansion chambers 30 and 32 are alternately connected via a first connecting tube 47 which is made of a carbon steel. The first connection pipe 47 penetrates the right sides of the respective lower parts of the front and rear separators 27 and 28 and is caulked to the separators 27 and 28 in FIGS. 48 and 49, respectively, with the exhaust gas in the rear expansion chamber 32 via the first connection pipe 27 into the front expansion chamber 30 is directed. The front and middle expansion chambers 30 and 31 are alternately connected via a second connecting pipe 51 made of a carbon steel pipe. The second connection pipe 51 penetrates the left side of the lower part of the front separator 27 , is caulked on the front separator 27 in 33, and the exhaust gas in the front expansion chamber 30 is conducted into the middle expansion chamber 31 via the second connection pipe 51 . Furthermore, the middle expansion chamber 31 is connected to the outside air via a third connecting pipe 54 , which is similarly made from a carbon steel pipe. The front of this third connecting pipe 54 penetrates the center of the lower part of the rear separator 28 in the horizontal direction, is caulked at the rear separator 28 in 55 , and is inclined downwards with this into the rear expansion chamber 32 , the rear of the outlet 26 of the muffler housing 20 pierces and is welded there. The shoulder of the peripheral surface of the catalytic converter housing 40 is welded in 56 in the central part of the third connecting pipe 54 , whereby the catalytic converter unit CU is supported by the third connecting pipe 54 . Since the upstream side of the exhaust pipe 16 with respect to the catalyst unit CU and the front of the third connection pipe 54 are both supported by the same rear separator 28 (caulked in Figs. 34 and 55 ), the distance between the corresponding supported parts and the welded part 56 can be substantially equalized , whereby a thermal stress acting on each part can be reduced compared to a conventional case in which the catalytic converter unit CU is supported by the muffler case 20 which has a temperature very different from the catalytic converter unit, as a result of which a thermal Deformation that is caused in the exhaust pipe 16 , the third connecting pipe 54 and the catalyst housing 40 can be reduced as far as possible.

Glass wool 58 is arranged as sound insulation material on a large part of the inner surface of the silencer housing 20 , the exposed surface of the glass wool 58 being covered with an inner plate 59 , in which a plurality of small holes 60 are formed, and which is connected to the inner surface of the silencer housing 20 .

The effect of the first embodiment is explained below. When the internal combustion engine unit EU is operated, the exhaust gas generated by the combustion of fuel is passed from the exhaust gas connection 15 via the exhaust pipe 16 into the catalytic converter unit CU in the muffler housing 20 . The exhaust gas that flows into the catalytic converter unit CU comes into contact with a catalytic converter, whereby pollutants that are contained in the exhaust gas, such as. As HC and CO, be detoxified and eliminated. The detoxified exhaust gas enters the rear expansion chamber 32 via the outlet 45 of the catalytic converter unit CU, enters the front expansion chamber 30 via the first connecting pipe 47 , enters the middle expansion chamber 31 via the second connecting pipe 51 , and also passes through the third Connection pipe 54 emitted into the outside air. Over time, the exhaust gas is repeatedly expanded and reduced, its exhaust sound energy being attenuated and absorbed when it comes in contact with the glass wool 58 , and the noise is effectively reduced.

If the catalytic converter unit CU is supported by the third connecting pipe 54 through which the exhaust gas flows, ie by a functional component of the silencer, no dedicated support element is required to support the catalytic converter unit CU, thereby reducing the number of parts of the silencer MU with catalytic converter the structure can be simplified, the catalyst unit CU is not supported by the muffler housing 20 , which has a significantly different temperature therefrom, and further, since there is a clearance between the catalyst unit and the muffler housing 20 , thermal stress due to the thermal expansion and heat contraction of its support element is reduced and the deformation due to the thermal stress on the catalyst unit can be prevented if possible. Further, since the third connecting pipe 54 supports the catalyst unit CU, the resonance frequency of the catalyst unit can be reduced, whereby its vibrations are suppressed and the exhaust noise can be reduced.

Further, since the upstream side of the exhaust pipe 16 connected to the catalytic converter unit CU and the third connection pipe 54 supporting the catalytic converter unit CU are both supported by the same rear separator 28 , the distance between the part becomes thereby (the welded part 56 ) in which the third connecting pipe 54 supports the catalyst unit CU and the other part (one of the caulked parts 34 or 55 ) in which the rear separator 28 supports is substantially the same, with 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.

In the following a second embodiment of the invention will be described with reference to FIGS. 8 to 11.

Fig. 8 is a longitudinal side view showing the catalyst silencer according to the invention. Fig. 9 is a sectional view taken along a line 9-9 in Fig. 8. Fig. 10 is a sectional view taken along a line 10-10 in Fig. 8. Fig. 11 is a sectional view taken along a line 11-11 in Fig. 8 The same reference numerals are used to denote the same components as in the first embodiment.

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

As is clear from FIGS. 9 and 10, diamond-shaped flat parts 135 and 136 are symmetrically formed on the upper wall and the lower wall, each of which is assigned to the front expansion chamber 130 of the muffler housing 120 , both ends of which are mutually parallel two insertion tubes 137 provided in the expansion chamber 130 are fixed to these flat parts 135 and 136 , respectively. The downstream end of the exhaust pipe 116 is attached to the muffler housing 120 and connected to it via suitable fastening means, z. B., as shown in Fig. 10, an insertion flange 116 f, which is attached to the end of the exhaust pipe 116 , is fastened by means of a bolt b which pierces one of the two insertion tubes 137 and to which a nut n is attached.

An inlet 125 of the muffler MU is arranged on the flat part 135 of the upper wall between the two insertion pipes 137 , an exhaust pipe on the downstream side 117, similar to a knee piece, which is connected to the exhaust pipe 116 , connected to the inlet 125 . The exhaust pipe on the downstream side 117 is extended rearward into the front expansion chamber 130 , is connected to an inlet 144 of a catalytic converter unit CU accommodated in the middle expansion chamber 131 , the connection piercing the front separator 127 , and is fastened to the front separator. As shown in FIGS. 8 and 11, a catalyst housing 140 of the catalyst unit CU is formed in the middle expansion chamber 131 by welding the insert flanges 141 f and 142 f to an upper housing half 141 and a lower housing half 142 , the insert flanges 141 f and 142 f are extended to the outside and two second connecting pipes 151 are welded to the flanges and fastened thereon. The two second connecting pipes 151 extend parallel forwards and backwards into the muffler housing 120 , with their two ends at the front and rear penetrating the front and rear separators 127 and 128 and being stemmed in 152 and 153 . Both sides of the catalyst unit CU are thus supported by two second connecting pipes 151 . The two second connection pipes 151 are connected to the front expansion chamber 130 and the rear expansion chamber 132 , respectively, with the exhaust gas in the front expansion chamber 130 being directed into the rear expansion chamber 132 .

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

As shown in FIG. 8, a short first connecting pipe 147 horizontally pierces the center of a lower part of the front separator 127 and is caulked in 148 , which enables the front expansion chamber 130 and the middle expansion chamber 131 to communicate, and that Exhaust gas in the middle expansion chamber 131 is directed into the front expansion chamber 130 .

As shown in FIG. 8, an insert pipe 138 , which is vertical, is provided at the rear portion of the middle expansion chamber 131 , and the two ends of the insert pipe 138 are attached to the upper and lower walls of the muffler housing 120 . The Schallufferge housing 120 is suspended from the internal combustion engine EU by means of suitable support means, z. B., as shown in Fig. 8 with a dashed line, the silencer housing is supported by means of a bolt b ', which penetrates the insertion tube 138 , and a nut n', which is attached to the bolt, by means of a support s, the is attached to the combustion engine unit EU. An end pipe 154 penetrates an outlet 126 of the muffler MU, which is located in a lower part of the rear wall of the catalytic converter housing 140 , is caulked in 155 and discharges the exhaust gas into the outside air in the rear expansion chamber 132 .

The effect of the second embodiment will now be described.

The exhaust gas generated by the operation of the internal combustion engine unit EU flows from the exhaust pipe 116 via the exhaust pipe on the downstream side 117 into the catalytic converter unit CU. The exhaust gas, the pollutants of which have been detoxified and removed, enters the front expansion chamber 130 from the central expansion chamber 131 via the first connecting pipe 147 , enters the rear expansion chamber 132 via two second connecting pipes 151 , and is introduced via the tail pipe 154 in released the outside air. Over the course of time, the exhaust gas is repeatedly expanded and reduced, the exhaust gas noise energy being damped.

Since the catalytic converter unit CU is supported by two second connecting pipes 151 through which the exhaust gas flows, that is to say through functional parts of the silencer, no dedicated support element is required to support the catalytic converter unit CU, as a result of which the number of parts of the silencer with catalytic converter is reduced and that Structure can be simplified because the catalyst unit CU is not supported by the silencer housing 120 , which is an element with a very different temperature, and there is also a clearance between the catalytic converter unit and the silencer housing 120 , so that the thermal stress due to the different thermal expansion and heat contraction between the catalyst unit and a support element is reduced and the deformation of the catalyst due to the thermal stress can be minimized. Further, since two second connection pipes 151 support the catalyst unit CU, their resonance frequency can be reduced, their vibrations can be suppressed and the exhaust gas noise can be reduced, and further, since the catalyst unit CU is supported by two second support pipes 51 , the support strength can be improved can.

The first and second embodiments of the invention are above has been written, however, the invention is not limited to this embodiment men limited, with different embodiments in one area the invention are possible. For example, in the embodiment described, in which the silencer with the catalyst according to the Invention on the exhaust system of the internal combustion engine of a motorcycle is used, however, the silencer with catalyst can be used according to the Invention of course also on another's exhaust system Internal combustion engine can be applied. Furthermore, in the execution form uses a metallic catalyst unit, however, though a catalyst used in the invention is only a catalyst that pollutants contained in the exhaust gas such. B. can detoxify HC and CO any catalyst can be used.

To the number of parts of an element to support a catalyst unit in a silencer housing of a silencer with catalytic converter Tor, with an exhaust system of an internal combustion engine for a motorcycle is connected to reduce and thus simplify the structure and a thermal stress due to thermal expansion and heat contraction of the catalyst unit and the support element reduce and thus the deformation of the catalyst unit if possible a catalyst unit in a silencer housing is to be prevented recorded with play and supported by a connecting tube that is a functional part of the muffler and attached to a separator is to let exhaust gas flow through.  

Description of the reference symbols

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)

152

Connecting pipe (second connecting pipe)
CU catalyst unit

Claims (3)

1. silencer with catalyst, in which a silencer housing ( 20 ; 120 ), which is connected to an exhaust pipe ( 16 ; 116 ), by means of separators ( 27 , 28 ; 127 , 128 ) in several expansion chambers ( 30 , 31 , 32 ; 130 , 131 , 132 ), the expansion chambers ( 30 , 31 , 32 ; 130 , 131 , 132 ) being connected via a plurality of connecting pipes ( 47 , 51 , 54 ; 147 , 151 ) which are separated by the separators ( 27 , 28 ; 127 , 128 ) are supported, a catalyst unit (CU), which is connected to the exhaust pipe ( 16 , 116 ), being provided in the silencer housing ( 20 ; 120 ), and the detoxified exhaust gas being released into the air, after the exhaust gas that flows into the muffler housing ( 20 ; 120 ) has been detoxified by the catalytic converter 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; in which
the catalytic converter unit (CU) is accommodated with play in the muffler housing ( 20 ; 120 ); and
a catalyst housing ( 40 ; 140 ) is supported by at least one connecting tube ( 54 ; 151 ) which is attached to the separators ( 27 , 28 ; 127 , 128 ). 2. A catalyst silencer according to claim 1, wherein:
In the silencer housing ( 20 ), an exhaust pipe ( 16 ), which is connected to the catalytic converter unit (CU), and a connecting pipe ( 54 ), which supports the catalytic converter unit (CU), are supported by the same separator ( 28 ). 3. A catalyst silencer according to claim 1, wherein:
the catalyst unit (CU) is supported by the plurality of connecting pipes ( 151 ).