DE102011119675B4 - Forced ventilation device and motor vehicle - Google Patents

Abstract

Forced ventilation device for a motor vehicle with a driver's cab, comprising a flap valve (20, 22) arranged in the lower side area of the cab rear wall (18) and an air duct (26, 28) which has an air inlet (32) open to the cab interior in its one end area and is coupled to the flap valve (20, 22) with an air outlet arranged in its other end region, the air duct (26, 28) on the rear of a seat base (100, 120), by means of which an occupant seat (10, 12) on the cabin floor is anchored, ends and the air inlet (32) points to the next adjacent cabin side wall, so that it is located in a cabin area that has no place where an ear (14, 16) of a vehicle occupant can be in the intended seating position, via a direct sound path (24, 25) is connected.

Description

Field of invention

The invention relates to a forced ventilation device for a motor vehicle having a driver's cab.

The invention further relates to a motor vehicle with a driver's cab having a forced ventilation device.

State of the art

Forced ventilation devices are required in vehicles with well-sealed and / or small passenger compartments in order to compensate for sudden pressure fluctuations, such as those that occur when doors are closed, for example. This is of particular relevance in the case of vehicles with driver's cabs, as they are often used in particular in commercial vehicles. These driver's cabs, in which driver and / or passenger seats are arranged directly in front of a cab rear wall, have a relatively small volume and, with the doors, comparatively large openings, so that the sudden pressure change that occurs when a door is closed is considerable.

Typically, the driver's cab is automatically ventilated via passages in the lower, laterally outer area of the cab rear wall. To prevent a constant flow of air, the passages are designed as flap valves that open when there is overpressure inside the cabin. It is problematic that such flap valves only have a low level of sound insulation.

the DE 30 21 871 A1 suggests for limousines to connect air inlets under the rear window via air ducts that run under the parcel shelf with air outlets arranged in pillars of the vehicle frame, whereby the air inlets arranged on one side of the vehicle are connected to an air outlet on the other side of the vehicle for as long as possible Obtain air ducts. Inside, the air ducts are lined with sound-absorbing material. If there is overpressure in the cabin, air enters the air inlet, passes through the duct and is discharged via the air outlet. Sound penetrating from the outside, on the other hand, is absorbed by the lining material of the duct on its way from the air outlet, which acts as a sound inlet, to the air inlet, which acts as a sound outlet. The disadvantage of this device, however, is the considerable effort and space requirement that are associated with the additional elements that are formed by the air ducts.

Also the DE 196 18 396 A1 discloses lateral air outlets which are connected to air inlets in the area of the rear window via sound-absorbing air ducts. However, the air inlets are designed here as openings of a box-like exhaust air collector arranged under the parcel shelf, which is intended to act as a Helmholtz resonator and into which the air ducts open. The air outlets are provided with flap valves.

the DE 34 07 298 A1 discloses an ambulance vehicle with a driver's cab, in the rear wall of the cabin flap valves are provided for venting the driver's cab into the adjacent ambulance space and the ambulance space in turn has a flap valve vent to the outside of the vehicle.

From the DE 10 2010 010 927 A1 a diaphragm attachment for flap valves is known which has a reflective labyrinth geometry that is intended to reflect part of the sound entering from the outside. However, the insulation effect of this measure is considered to be insufficient.

From the EP 1 431 084 A2 It is known to reduce the noise nuisance caused by the fan of a motor vehicle air conditioning system in that the air conditioning housing has side openings through which the sound from the fan is directed into areas behind the instrument panel, whereas the air driven by the fan can flow into the vehicle interior through ventilation nozzles . The side openings are closed with a material that conducts air but is permeable to sound. A further development in terms of the choice of material is in the DE 10 2005 027 566 A1 disclosed.

Task

It is the object of the present invention to develop a generic forced ventilation device in such a way that effort and space requirements are largely reduced.

Statement of the invention

• - ein im unteren Seitenbereich der Kabinenrückwand angeordnetes Klappenventil und
• - einen Luftleitkanal, der in seinem einen Endbereich einen zum Kabineninneren offenen Lufteinlass aufweist und mit einem in seinem anderen Endbereich angeordneten Luftauslass an das Klappenventil angekoppelt ist,

wobei der Luftleitkanal an der Rückseite eines Sitzsockels, mittels dessen ein Insassensitz am Kabinenboden verankert ist, endet und
der Lufteinlass zu der nächstbenachbarten Kabinenseitenwand weist, sodass er sich in einem Kabinenbereich befindet, der mit keinem Ort, an dem sich bei bestimmungsgemäßer Sitzposition ein Ohr eines Fahrzeuginsassens befinden kann, über einen direkten Schallweg verbunden ist.This object is achieved by the features of claim 1, ie comprising a forced ventilation device for a motor vehicle having a driver's cab

• - A flap valve arranged in the lower side area of the cabin rear wall and
• - An air duct which has an air inlet open to the cabin interior in its one end area and is coupled to the flap valve with an air outlet arranged in its other end area,

wherein the air duct ends at the rear of a seat base, by means of which an occupant seat is anchored to the cabin floor, and
the air inlet points to the next adjacent cabin side wall so that it is located in a cabin area that is not connected via a direct sound path to any place where an ear of a vehicle occupant can be located in the intended seating position.

• - einem im unteren Seitenbereich der Kabinenrückwand angeordneten Klappenventil und
• - einem Luftleitkanal, der in seinem einen Endbereich einen zum Kabineninneren offenen Lufteinlass aufweist und mit einem in seinem anderen Endbereich angeordneten Luftauslass an das Klappenventil angekoppelt ist,

wobei der Luftleitkanal an der Rückseite eines Sitzsockels, mittels dessen ein Insassensitz am Kabinenboden verankert ist, endet und
der Lufteinlass zu der nächstbenachbarten Kabinenseitenwand weist, sodass er sich in einem Kabinenbereich befindet, der mit keinem Ort, an dem sich bei bestimmungsgemäßer Sitzposition ein Ohr eines Fahrzeuginsassens befinden kann, über einen direkten Schallweg verbunden ist.The object is also achieved by the features of claim 5, ie by a motor vehicle with a driver's cab having a forced ventilation device

• - A flap valve arranged in the lower side area of the cabin rear wall and
• - An air duct which has an air inlet open to the cabin interior in its one end area and is coupled to the flap valve with an air outlet arranged in its other end area,

wherein the air duct ends at the rear of a seat base, by means of which an occupant seat is anchored to the cabin floor, and
the air inlet points to the next adjacent cabin side wall so that it is located in a cabin area that is not connected via a direct sound path to any place where an ear of a vehicle occupant can be located in the intended seating position.

Preferred embodiments of the invention are the subject of the dependent claims.

The invention is based on the knowledge that the degree of annoyance caused by noises depends less on their absolute sound power than on their localizability. For example, a comparatively low noise that can be precisely located can be perceived as significantly more annoying than a louder noise from an undefined source. A noise can be localized in particular when there is a direct sound path between the source and the ear of the listener. However, if the direct sound path is blocked by objects or components, so that the sound only reaches the ear of the listener via detours that cause reflection and diffraction of the sound waves, the listener can no longer locate the sound source. Based on this knowledge, the invention proposes to deflect the sound penetrating through the flap valve by means of a simply designed air duct, which can be very short compared to the air ducts known from the prior art, to such an extent that it is at such a point within the cabin exits from the air inlet or sound outlet of the air duct which is not connected to the ear of a vehicle occupant, in particular the driver or front passenger, via a direct sound path; Rather, objects and components that are already necessary in the driver's cab should be located as sound blockages between the sound exit point, i.e. the air inlet of the air duct, and the ear. The location of the sound outlet should be selected in such a way that this condition applies to every possible position of each occupant's ear, with of course only intended seating positions of the vehicle occupants being taken into account.

As a result, a sound-absorbing lining of the air ducts can in principle be dispensed with. The air ducts can also be made significantly shorter than is known in the prior art.

This is used according to the invention in that the air duct ends at the rear of a seat base, by means of which an occupant seat is anchored to the cabin floor, and the air inlet, i.e. the sound outlet, points to the next adjacent cabin side wall. In other words, the sound is brought as close as possible to the back of the seat and then released only to the outside, i.e. in the case of a left-hand drive car to the left on the driver's side and to the right on the passenger side. It is obvious that there is no direct sound path between the driver's ear and the sound outlet in “his” air duct; rather, the direct route through the driver's seat is blocked. At the same time, however, it is also ensured that there is no direct sound path between the sound outlet of the driver's air duct and the passenger's ear. This is blocked at least by the driver's air duct itself. The same applies to the air duct on the passenger side. This ensures that the noises penetrating through the air ducts only reach the driver's or front passenger's ear via detours after reflection and diffraction and are therefore no longer localizable and are therefore limited in their annoyance.

In a further development of the invention, which can be used in all of the aforementioned variants, it is provided that the air inlet has a plurality of adjacent openings in the wall of the air duct. The overall size of the air inlet is essentially determined by the level of the pressure fluctuations to be expected and compensated for. By dividing the total opening area into several neighboring openings, there is increased sound reflection inside the air duct and thus additional insulation.

The air duct is preferably made in one piece from plastic. This represents a particularly cost-effective manufacturing method.

In a further development of the invention it is provided that the air duct is lined with sound-absorbing material. This feature, which is basically known from the prior art, can be used for additional noise reduction, in particular for reducing the sound power penetrating into the cabin.

Further features and advantages of the invention emerge from the following specific description and the drawings.

Figure list

• 1: eine schematische Darstellung einer Fahrerkabine mit herkömmlichem Zwangsentlüftungssystem;
• 2: eine schematische Darstellung einer Fahrerkabine mit erfindungsgemäßem Zwangsentlüftungssystem;
• 3: eine schematische Seitenansicht einer ersten Ausführungsform des erfindungsgemäßen Zwangsentlüftungssystems;
• 4: eine Draufsicht auf das System von 3;

Show it:

• 1 : a schematic representation of a driver's cab with a conventional forced ventilation system;
• 2 : a schematic representation of a driver's cab with a forced ventilation system according to the invention;
• 3 : a schematic side view of a first embodiment of the forced ventilation system according to the invention;
• 4th : a top view of the system of 3 ;

Detailed description of preferred embodiments

The same reference symbols in the figures indicate the same or analogous components.

1 shows a schematic representation of a driver's cab of a motor vehicle according to the prior art. In particular, a driver's seat is shown 10 and a passenger seat 12th . The positions of the driver's ears are indicated by ears 14th and the passenger ears 16 indicated. The seats 10 , 12th are immediately in front of the rear wall 18th arranged in the driver's cab. In the lower area of the rear wall 18th are flap valves on each side on the outside 20th , 22nd arranged, the flap valve 20th roughly in the middle behind the driver's seat 10 and the flap valve 22nd roughly in the middle behind the passenger seat 12th is arranged.

As discussed in the general part of the description, the flap valves are used 20th , 22nd the forced ventilation. In particular, they open to the outside when there is overpressure in relation to the outside world in the driver's cab. This occurs especially when closing the doors.

From the outside through the flap valves 20th , 22nd penetrating sound expands, as long as it is not blocked by built-in components, essentially spherically. There are direct sound paths 24 , 25th from the driver's flap valve 20th to the driver's side passenger ear 16 and from the passenger-side flap valve 22nd to the driver's ear on the passenger side 14th . Due to this direct sound path, the driver and front passenger can each clearly locate an (apparent) source of noise, which makes this noise particularly annoying.

2 shows essentially the same structure as 1 but with sound insulation of the flap valves according to the invention 20th , 22nd . In particular, air ducts extend 26th , 28 from the flap valves 20th , 22nd towards the seats 10 , 12th especially on the seat pedestals 100 , 120 there. How with the 3 and 4th This explains the direct sound paths from the flap valves 20th , 22nd towards the driver's / passenger's ears 14th , 16 completely prevented. Rather, there are only indirect sound paths that are indicated by the sound path arrows 30th are shown.

the 3 and 4th show a schematic representation in side or top view of a first embodiment of the sound insulation system according to the invention using the example of the driver's seat 10 . Between the flap valve 20th and the seat pedestal 100 extends the air duct 26th , facing the outside, ie the side wall of the driver's cab next to it, four air inlet and sound outlet openings 32 having. This results in the indirect sound path 30th who is in 4th is shown.

Of course, the embodiments discussed in the specific description and shown in the figures are only illustrative embodiments of the present invention. In the light of the disclosure here, a person skilled in the art is provided with a broad spectrum of possible variations.

List of reference symbols

10

Driver's seat

100

Base of 10 / seat box

12th

Passenger seat

120

Base of 12 / seat box

14th

Driver's ear

16

Passenger ear

18th

Cabin rear wall

20th

drive-side flap valve

22nd

passenger-side flap valve

24

direct sound path

25th

direct sound path

26th

driver-side air duct

28

passenger-side air duct

30th

indirect sound path

32

Air inlet / sound outlet opening

Claims (5)

Forced ventilation device for a motor vehicle having a driver's cab, comprising - A flap valve (20, 22) and arranged in the lower side area of the cabin rear wall (18) - An air duct (26, 28) which has an air inlet (32) open to the cabin interior in its one end area and is coupled to the flap valve (20, 22) with an air outlet arranged in its other end area, the air duct (26, 28) ) ends at the rear of a seat base (100, 120), by means of which an occupant seat (10, 12) is anchored to the cabin floor, and the air inlet (32) points to the next adjacent cabin side wall so that it is located in a cabin area that has no place where an ear (14, 16) of a vehicle occupant can be in the intended seating position, via a direct sound path (24, 25 ) connected is. Forced ventilation device according to Claim 1 characterized in that the air inlet (32) has a plurality of adjacent openings in the wall of the air duct (26, 28). Forced ventilation device according to one of the preceding claims, characterized in that the air duct (26, 28) is made in one piece from plastic. Forced ventilation device according to one of the preceding claims, characterized in that the air duct (26, 28) is lined with sound-absorbing material. Motor vehicle with a driver's cab having a forced ventilation device - A flap valve (20, 22) and arranged in the lower side area of the cabin rear wall (18) - An air duct (26, 28) which has an air inlet (32) open to the cabin interior in its one end area and is coupled to the flap valve (20, 22) with an air outlet arranged in its other end area, the air duct (26, 28) ) ends at the rear of a seat base (100, 120), by means of which an occupant seat (10, 12) is anchored to the cabin floor, and the air inlet (32) points to the next adjacent cabin side wall so that it is located in a cabin area that has no place where an ear (14, 16) of a vehicle occupant can be in the intended seating position, via a direct sound path (24, 25 ) connected is.

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