DE102012104396A1 - Motor car silencer has upper and lower valves that are respectively arranged on aperture of exhaust tube and exhaust gas passage through which exhaust gas volume flow rate is changed - Google Patents

Abstract

The motor car silencer (1) has a silencer housing (2) having two silencer housing portions (2.1,2.2), an exhaust tube (3), an exhaust gas passage (4.1) and a heat exchanger (4). The silencer housing portions are connected to the exhaust tube and are arranged parallel to the exhaust gas passage. An upper valve (5.1) is arranged on an aperture (3.1) of the exhaust tube through which the exhaust gas volume flow rate is changed. The lower valve (6.1) is arranged in the region of an aperture (4.2) of the exhaust gas passage through which the exhaust gas volume flow rate is changed.

Description

The invention relates to a motor vehicle silencer with a silencer housing consisting of a first silencer housing part and a second silencer housing part, with an exhaust pipe and with a heat exchanger having at least one exhaust duct, wherein both silencer housing parts at least one exhaust pipe and at least the one exhaust duct or a heat exchanger are fluidically connected, and with a arranged at an opening of the exhaust pipe valve body, via which a flowing through the exhaust pipe exhaust gas flow A or an opening cross section of the opening is changed or closed.

Both muffler housing parts are preferably fluidly connected only via exhaust pipes and heat exchangers. The exhaust gas volume flow A can be changed by means of an installed valve body. Thus, by changing the opening cross-section of the opening of the exhaust pipe, the exhaust gas volume flow A in the exhaust pipe changes, thus the exhaust gas volume flow A in the heat exchanger can be influenced.

It is already a motor vehicle silencer from the JP 2007 113559 A known, comprising a heat exchanger and an exhaust pipe, which connect a first chamber of the muffler housing with a second chamber of the muffler housing. In the region of an opening of the exhaust pipe, a valve is provided, via which the volume flow of the exhaust pipe can be changed.

From the EP 2 412 945 A2 is a motor vehicle silencer with a heat exchanger known. The inlet pipe is equipped with a branch, so that a volume flow flows through the heat exchanger and a volume flow is passed over. The branch has a valve flap, so that the two volume flows can be changed depending on each other.

The object of the invention is to design and arrange motor vehicle silencers in such a way that a more flexible regulation of the exhaust gas flows is ensured despite the simple design.

The object is achieved according to the invention in that a second valve body is provided in the region of an opening of the exhaust passage through which an exhaust gas volume flow A flowing through the exhaust passage or an opening cross section of the opening of the exhaust passage can be changed or closed. The second valve body should be adjustable independently of the first valve body, so that when the exhaust passage or heat exchanger, a complete closure of the exhaust pipe is possible. This in turn allows efficient use of the heat exchanger.

The exhaust duct is part of the heat exchanger. At least one exhaust duct is necessary for forming a heat exchanger, wherein at least one further, the heat exchange medium leading element, such as another pipe wall is necessary to form a heat exchanger. However, this element does not necessarily have to be part of the motor vehicle silencer. For example, this element could also be formed by other body parts or air baffles.

It may also be advantageous for this purpose if a first intermediate wall and a second intermediate wall are provided and the first muffler housing part is bounded by the first intermediate wall and the second muffler housing part is bounded by the second intermediate wall, wherein at least one of the two intermediate walls closed, d. H. is formed without perforation. Through the closed intermediate wall both muffler housing parts are sealed off from each other, so that the flow connection must be made via the exhaust pipe or the heat exchanger. Of course, the latter presupposes that an inlet of the motor vehicle silencer in the first silencer housing part and the outlet in the second silencer housing part are arranged.

The formation of two partitions creates a third silencer housing part, which is arranged between the first silencer housing part and the second silencer housing part. Due to the perforation of an intermediate wall, the one silencer housing part is acoustically coupled directly to the third silencer housing part.

Accordingly, it is advantageous if the first intermediate wall and the second intermediate wall in the muffler housing have a bearing seat L1, L2 and that the exhaust pipe and the heat exchanger in the first intermediate wall and / or in the second intermediate wall have a bearing seat L3-L6, wherein at least one bearing seat L1 of an intermediate wall and / or at least one bearing seat L3 of the exhaust pipe and / or at least one bearing seat L5 of the heat exchanger is designed as a sliding fit. The arrangement or distribution of the sliding seats is designed so that a compensation of different elongations of the exhaust pipe on the one hand and the cooler heat exchanger on the other hand is guaranteed.

Furthermore, it may be advantageous if the first muffler housing part is formed as a first housing segment and the second Silencer housing part is designed as a second housing segment, wherein the first housing segment is arranged spatially separated from the second housing segment and the first housing segment is mechanically connected to at least one exhaust pipe and at least one heat exchanger with the second housing segment. Both housing segments are thus completely self-contained. The respective muffler housing part is designed as a separate muffler housing part. This is ensured, for example, by forming a separate lateral surface with two end faces or by forming two half shells each. The heat exchanger is arranged in this case, at least for the most part between the two housing segments, so that it is only partially acted upon by the temperature prevailing in the muffler housing. The closed heat exchanger is therefore only slightly charged with exhaust heat. The proportion of parasitic heat is thus significantly reduced.

It can also be advantageous if the valve body is assigned to an actively or passively adjustable valve. The passive valve can be a thermostatic valve or a wax regulator. Alternatively, the valve can also be actively configured, that is, supplied with external control energy.

It can be advantageously provided when the exhaust pipe has a perforation only in one or the first muffler housing part. Since the exhaust pipe can be closed in the other or the second silencer housing part via the valve body, the possibility of the gas outlet thus remains only in the first silencer housing part. An inflow of exhaust gas into the second silencer housing part is prevented when the exhaust pipe is closed.

Of particular importance may be for the present invention, if only in a muffler housing part, a further intermediate wall is provided which has a perforation. The further intermediate wall serves to support the outlet pipe socket. This can also be stored via the exhaust pipe or the heat exchanger. The further intermediate wall is coupled through the perforation to the volume of the silencer housing part in which it is mounted.

In connection with the design and arrangement according to the invention, it may be advantageous if the perforation of the exhaust pipe is provided in the first silencer housing part or in a third silencer housing part acoustically coupled thereto and the valve body is arranged in the second silencer housing part. By closing the exhaust pipe by means of the valve body, a foreclosure of the second silencer housing part is thus ensured.

It can also be advantageous if the valve is arranged outside of the silencer housing part and coupled to the valve body via an actuator. The valve is thus accessible for replacement or maintenance.

Further advantages and details of the invention are explained in the patent claims and in the description and illustrated in the figures. Show it:

1a a cross-sectional view of a motor vehicle exhaust with closed exhaust pipe;

1b a sectional view to 1a with closed heat exchanger;

2a an alternative embodiment of the motor vehicle exhaust with closed exhaust pipe;

2 B a sectional view to 2a with closed heat exchanger.

The after 1a illustrated motor vehicle silencer 1 is designed as a winding muffler with a round or cylindrical muffler housing 2 , which frontally through two end walls 2c . 2d closed is. Inside the muffler housing 2 are also a first partition 2a and a second partition 2 B arranged. In addition to this is another partition 7 intended. The front wall formed as an outer wall 2c forms together with the first partition 2a and the proportionate muffler housing 2 , a first muffler housing part 2.1 while the outside wall 2d together with the second partition 2 B and the proportionate muffler housing 2 , a second muffler housing part 2.2 forms.

Both muffler housing parts 2.1 . 2.2 are fluidically through an exhaust pipe 3 and a heat exchanger 4 coupled.

The exhaust pipe 3 forms in the area of the front wall 2c the inlet and the inlet opening for exhaust gas A and is complementary to the storage in the end wall 2c through the first partition 2a and the second partition 2 B to the second silencer housing part 2.2 guided. The heat exchanger 4 , the different exhaust ducts 4.1 . 4.1 ' is in the first partition 2a and in the second partition 2 B stored and extends, starting from the first silencer housing part 2.1 , into the second silencer housing part 2.2 ,

According to embodiment 1a is the end of the exhaust pipe 3 a valve 5 with a valve body 5.1 provided, which the opening cross-section 3.1 of the exhaust pipe 3 closes the front side. Thus, this flows into the inlet 1.1 inflowing exhaust gas A via a perforation zone 3.2 of the exhaust pipe 3 , inside the first silencer housing part 2.1 in an opening 4.2 of the heat exchanger 4 and is via the heat exchanger 4 to the second silencer housing part 2.2 where it has a pipe socket forming the outlet 1.2 from the vehicle silencer 1 is led out.

To switch off or deactivate the heat exchanger 4 , according to 1b the valve 5 , hence the opening 3.1 of the exhaust pipe 3 opened and over a valve 6 or a valve body 6.1 , the opening 4.2 of the heat exchanger 4 closed. Thus, the exhaust gas A flows from the inlet 1.1 , through the exhaust pipe 3 to the second silencer housing part 2.2 where it is then over the pipe socket 1.2 flows. About the perforation zone 3.2 is the exhaust pipe 3 with the first silencer housing part 2.1 only acoustically coupled.

The second partition 2 B also has a perforation zone 2p on, over which the second silencer housing part 2.2 with one between the two partitions 2a . 2 B formed third muffler housing part 2.3 is acoustically coupled. The latter applies to the switching position according to 1b in which the exhaust gas A is above the exhaust pipe 3 in the second silencer housing part 2.2 is guided, where it then through the pipe socket 1.2 exit.

The pipe socket 1.2 is within the further partition 7 stored. This further partition 7 shares, so to speak, the second silencer housing part 2.2 , wherein through the perforation zone 7.1 the further partition 7 , the two parts are acoustically coupled.

The heat exchanger 4 has an inlet channel 4a and an outlet channel 4b on, via the heat exchanger medium W in the heat exchanger 4 flows in and out again. The two inlet and outlet channels 4a . 4b are through the muffler housing 2 or guided the outer wall.

The exhaust pipe 3 is inside the first partition 2a in a first bearing seat L3 and within the second partition wall 2 B stored in a bearing seat L4. The heat exchanger 4 is inside the first partition 2a in a bearing seat L5 and within the second partition 2 B stored in a bearing seat L6. The two partitions 2a . 2 B are inside the muffler housing 2 stored in a bearing seat L1 and L2. To compensate for the different thermal expansions of the exhaust pipe 3 on the one hand and the slightly cooler heat exchanger 4 On the other hand, at least the bearing seat L1 is at least partially, with respect to the circumference, formed as a sliding seat. The same applies to the bearing seat L2 of the second partition 2 B ,

Alternatively, as in an embodiment not shown, one or more of the bearing seats L3 to L6 may be formed as a sliding seat.

According to the embodiments 2a . 2 B are two separate silencer housings 2.1 . 2.2 provided, wherein the first muffler housing part 2.1 spatially separated to the second silencer housing part 2.2 arranged. Both muffler housing parts 2.1 . 2.2 are not only aerodynamically, but also mechanically only through the exhaust pipe 3 and the heat exchanger 4 connected. The two end walls 2a . 2 B close the respective silencer housing part 2.1 . 2.2 as well as the two end walls 2c . 2d gastight towards the outside. The same applies to the bearing seats L3, L4, L5, L6 between the exhaust pipe 3 or the heat exchanger 4 and the respective end wall 2a . 2 B ,

In contrast to the embodiments 1a . 1b becomes the heat exchanger 4 , especially in the post position 2 B , ie in the deactivated position, not by the inside of the exhaust muffler 1 Heat is applied to the prevailing temperature, so that the heat exchange medium W is largely protected from parasitic heat.

Inside the second silencer housing part 2.2 is also another partition 7 with a perforation zone 7.1 provided within the pipe socket 1.2 is stored. In addition to the perforation zone 7.1 has the further partition 7 a recess 7.2 on, through which the valve body 5.1 when opening and closing is performed.

The two muffler housing parts 2.1 . 2.2 each form a mutually gastight sealed silencer housing part and are only on the exhaust pipe 3 and the heat exchanger 4 coupled mechanically and fluidically. Thus, the first muffler housing part 2.1 only one inlet 1.1 and the second silencer housing part 2.2 only one outlet 1.2 on.

The two inlet and outlet channels 4a . 4b of the heat exchanger 4 are therefore not through the muffler housing 2 guided. They extend between the two muffler housing parts 2.1 . 2.2 ,

LIST OF REFERENCE NUMBERS

1

Automotive silencer, exhaust silencer

1.1

Inlet, inlet opening

1.2

Outlet, outlet opening, pipe socket

2

muffler housing

2.1

first / first silencer housing part, first housing segment

2.2

second / second muffler housing part, second housing segment

2.3

acoustically coupled muffler housing part

2a

Front wall, first partition

2 B

Front wall, second partition

2c

Front wall, exterior wall

2d

Front wall, exterior wall

2p

Perforation, perforation zone

3

exhaust pipe

3.1

Opening, inlet opening

3.2

Perforation, perforation zone

4

heat exchangers

4.1

exhaust duct

4.1 '

exhaust duct

4.2

opening

4a

Inlet, inlet channel

4b

Outlet, outlet channel

5

Valve

5.1

valve body

6

Valve

6.1

valve body

7

another partition

7.1

Perforation, perforation zone

7.2

recess

A

Exhaust gas volume flow, flow direction

L1

bearing seat

L2

bearing seat

L3

bearing seat

L4

bearing seat

L5

bearing seat

L6

bearing seat

W

Heat exchanger medium, flow direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2007113559 A [0003]
• EP 2412945 A2 [0004]

Claims (9)

Automotive muffler ( 1 ) with a silencer housing ( 2 ), consisting of a first muffler housing part ( 2.1 ) and a second silencer housing part ( 2.2 ), with an exhaust pipe ( 3 ) and with at least one exhaust duct ( 4.1 ) having heat exchanger ( 4 ), wherein both muffler housing parts ( 2.1 . 2.2 ) via the at least one exhaust pipe ( 3 ) and in parallel thereto via the at least one exhaust gas channel ( 4.1 ) are fluidically connected, and with one at an opening ( 3.1 ) of the exhaust pipe ( 3 ) arranged valve body ( 5.1 ), through which a through the exhaust pipe ( 3 ) flowing exhaust gas flow A is variable, characterized in that a second valve body ( 6.1 ) in the region of an opening ( 4.2 ) of the exhaust duct ( 4.1 ) is provided via the one through the exhaust duct ( 4.1 ) flowing exhaust gas flow A is variable. Automotive muffler ( 1 ) according to claim 1, characterized in that a first intermediate wall ( 2a ) and a second partition ( 2 B ) are provided and the first muffler housing part ( 2.1 ) through the first partition ( 2a ) is limited and the second silencer housing part ( 2.2 ) through the second partition ( 2 B ), at least one of the two intermediate walls ( 2a . 2 B ) is closed. Automotive muffler ( 1 ) according to claim 2, characterized in that the first partition ( 2a ) and the second partition ( 2 B ) in the muffler housing ( 2 ) have a bearing seat L1, L2 and that the exhaust pipe ( 3 ) and / or the heat exchanger ( 4 ) in the first partition ( 2a ) and / or in the second partition ( 2 B ) have a bearing seat L3-L6, wherein at least one bearing seat L1 an intermediate wall ( 2a ) and / or at least one bearing seat L3 of the exhaust pipe ( 3 ) and / or at least one bearing seat L5 of the heat exchanger ( 4 ) is designed as a sliding seat. Automotive muffler ( 1 ) according to claim 1, characterized in that the first silencer housing part ( 2.1 ) is formed as a first housing segment and the second muffler housing part ( 2.2 ) is formed as a second housing segment, wherein the first housing segment ( 2.1 ) spatially separated to the second housing segment ( 2.2 ) and the first housing segment ( 2.1 ) only via at least one exhaust pipe ( 3 ) and via at least one heat exchanger ( 4 ) mechanically with the second housing segment ( 2.2 ) connected is. Automotive muffler ( 1 ) according to one of the preceding claims, characterized in that the valve body ( 5.1 . 6.1 ) an actively or passively adjustable valve ( 5 . 6 ) assigned. Automotive muffler ( 1 ) according to one of the preceding claims, characterized in that the exhaust pipe ( 3 ) only in a silencer housing part ( 2.1 . 2.2 ) a perforation ( 3.2 ) having. Automotive muffler ( 1 ) according to one of the preceding claims, characterized in that only in a muffler housing part ( 2.1 . 2.2 ) another intermediate wall ( 7 ), which has a perforation ( 7.1 ) having. Automotive muffler ( 1 ) according to claim 6 or 7, characterized in that the perforation ( 3.2 ) of the exhaust pipe ( 3 ) in the first muffler housing part ( 2.1 ) or an acoustically coupled third muffler housing part ( 2.3 ) is provided and the valve body ( 5.1 ) in the second silencer housing part ( 2.2 ) is arranged. Automotive silencer according to ( 1 ) one of claims 4 to 7, characterized in that the valve ( 5 . 6 ) outside of the silencer housing part ( 2.1 . 2.2 ) and via an actuator with the valve body ( 5.1 . 6.1 ) is coupled.

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