COVER AND COMMERCIAL VEHICLE

Abstract

Cover (31) for a cab ventilation system (30) of a commercial vehicle (1), in particular a military commercial vehicle, comprising an air guide housing (32) and a closure device (48, 49) for preventing the ingress of a liquid (83) into the air guide housing (32), wherein the closure device (48, 49) has a float (78) that is buoyant on the liquid (83), wherein the closure device (48, 49) has at least one closure flap (61, 62) that is reversible from an open state (Z1), in which the at least one closure flap (61, 62) exposes an air inlet opening (43, 44) of the air guide housing (32), to a closed state (Z2), in which the at least one closure flap (61, 62) closes the air inlet opening (43, 44), and vice versa, and wherein the float (78) is connected to the air guide housing (32) in such a way as to which is coupled to at least one closing flap (61, 62), such that the float (78) has at least one closing flap (61,62) when the floating body (78) rises on the liquid (83) from the open state (Z1) towards the closed state (Z2).

Description

[0001] The present invention relates to a cover for a cab ventilation system of a commercial vehicle, in particular a military commercial vehicle, and to a commercial vehicle, in particular a military commercial vehicle, with such a cover.

[0002] When driving off-road vehicles, water can enter the cab ventilation system when crossing bodies of water. This can cause filters, such as air filters, dust filters, pollen filters, sorption filters, or similar components, to become damp. As a result, the filters may no longer function properly or at all. Furthermore, the water can also enter the cab itself through the ventilation system.

[0003] To prevent such water ingress, ventilation flaps can be installed that the vehicle's crew can close from the outside before crossing bodies of water. This requires the crew to leave the cab. Alternatively, lever-operated systems can be used, allowing the ventilation flaps to be closed from inside the cab, as mentioned previously. This eliminates the need to leave the cab to close the flaps. However, water can enter the cab through the lever mechanism itself if it is not properly sealed.

[0004] Against this background, one object of the present invention is to provide an improved cover for a driver's cab ventilation system.

[0005] Accordingly, a cover for a cab ventilation system of a commercial vehicle, in particular a military commercial vehicle, is proposed.The cover comprises an air guide housing and a closure device for preventing the ingress of liquid into the air guide housing, wherein the closure device has a float that is buoyant on the liquid, wherein the closure device has at least one closure flap that can be moved from an open state, in which the at least one closure flap exposes an air inlet opening of the air guide housing, to a closed state, in which the at least one closure flap closes the air inlet opening, and vice versa, and wherein the float is coupled to the at least one closure flap in such a way that, when the float rises on the liquid, the float moves the at least one closure flap from the open state towards the closed state.

[0006] Because the float is integrated and coupled to at least one closure flap, the flap closes automatically simply by floating on the liquid. The closure device thus closes itself automatically. The vehicle's crew no longer needs to leave the vehicle to manually close the air intake openings. A complex lever mechanism is also unnecessary.

[0007] The cab ventilation system can be an air conditioning system or include an air conditioning unit that dehumidifies the interior of a commercial vehicle's cab, preventing, for example, icing or fogging of the cab's interior windows in winter. The cab ventilation system draws fresh air from the vehicle's surroundings and supplies it to the cab. This fresh air can be cooled, heated, and / or cleaned before being supplied to the cab as clean air. The cab ventilation system can incorporate various filter elements for this purpose. The cover is typically box-shaped or housing-like and protects the cab ventilation system during operation. The cover is removable, possibly using screw connections, snap-fit ​​connections, and / or other fasteners.This allows for both easy and quick installation and removal of the cover. The cover can also be referred to as a cab ventilation system cover.

[0008] The air duct housing is part of the cover. It guides fresh air drawn from the environment to the cab ventilation system. The air duct housing preferably comprises a box-shaped housing body and a removable housing cover. Accordingly, the air duct housing can be multi-part. In particular, the air duct housing can include the aforementioned housing body and the housing cover. The housing body and the housing cover can be made of plastic, especially injection-molded plastic. The housing cover and the housing body can be detachably connected by a screw connection, a snap-fit ​​connection, and / or a latching connection.

[0009] The cover can have any number of closure devices. Preferably, the cover has exactly two closure devices. However, the cover can also have exactly one closure device. The cover can also have more than two closure devices. In the following, only one closure device is referred to. The closure device, in particular, prevents a surge of liquid, for example water, from splashing into the air duct housing. The closure device is preferably not designed to seal the air inlet opening gas-tight. Any liquid that nevertheless enters the air duct housing can be drained, for example, via a check valve provided at the lowest point of the air duct housing.

[0010] The float is preferably a hollow body. Alternatively, the float can also be made of a low-density material. For example, the float can be made of polystyrene or cork. The float can be essentially rotationally symmetrical about a central axis. Accordingly, the float can be cylindrical. "Cylindrical" in this context does not necessarily mean a circular cylinder. The float can have any number of bulges and protrusions on its cross-section.

[0011] The float is not, in particular, rigidly connected to the at least one closure flap. The at least one closure flap and the float are therefore two separate components. Accordingly, the fact that the float is "coupled" to the at least one closure flap does not necessarily mean that a rigid connection between the float and the at least one closure flap is provided. The "coupling" between the float and the at least one closure flap can consist of the float resting against or contacting the at least one closure flap. The "coupling" then occurs, for example, in such a way that the at least one closure flap follows a movement of the float. The float can also be described as a buoyancy aid.

[0012] Preferably, the float makes contact with the at least one closure flap in both its open and closed positions. Spring elements can be provided to spring-load the at least one closure flap into the open position. This means that the at least one closure flap is spring-loaded against the float. This prevents the float from rattling when subjected to vibrations or oscillations. Several spring elements can be provided, or exactly one. When moving the at least one closure flap from the open to the closed position, the float moves it against the spring force of the spring element(s).

[0013] As soon as the float rises to the surface of the liquid, it moves the at least one closure flap, switching it from the open to the closed position. A direct connection between the float and the at least one closure flap is preferably not provided. In other words, the float and the at least one closure flap are not rigidly connected. When disassembling the closure device, the float can be lifted off the at least one closure flap, or vice versa, without having to break any connection between the float and the at least one closure flap.

[0014] The locking device can have more than one locking flap. For example, the locking device can have two locking flaps, in particular a first locking flap and a second locking flap. However, the number of locking flaps is arbitrary. It is also possible to have exactly one locking flap. In the following, we assume at least one locking flap. "At least one locking flap" includes, for example, both exactly one locking flap and exactly two locking flaps.

[0015] The at least one closing flap can be pivoted from the open to the closed position and vice versa. In the open position, the closing flap seals the air inlet opening. In the closed position, the at least one closing flap does not seal the air inlet opening. Multiple air inlets can be provided. For example, a first air inlet opening and a second air inlet opening are provided. Each air inlet opening can have its own closing device. The following refers to only one air inlet opening.

[0016] The air inlet opening is provided on the air duct housing. Specifically, the closing device is located upstream of the air inlet opening. Accordingly, the air inlet opening is positioned downstream of the closing device. "Upstream" and "downstream" refer here to the direction of flow of the fresh air drawn in from the environment. After passing through the closing device, the fresh air flows through the air inlet opening into the air duct housing. The air duct housing supplies the fresh air to the cab ventilation system.

[0017] The locking device moves automatically from the open to the closed position, particularly with the aid of a buoyancy force generated by the float. Manual operation of the locking device or an additional actuating element, such as an electric motor, pneumatic cylinder, or hydraulic cylinder, is therefore unnecessary. This makes the locking device particularly easy to construct and also very reliable.

[0018] According to one embodiment, the at least one closure flap performs a rotational movement when it is moved from the open state to the closed state and vice versa.

[0019] In particular, the at least one closure flap performs exclusively a rotary movement. A translational or linear movement of the at least one closure flap to move it from the open state to the closed state and vice versa is specifically not provided. The at least one closure flap can rotate about a pivot axis from the open state to the closed state and vice versa.

[0020] According to another embodiment, the locking device has a bearing frame on which at least one locking flap is rotatably mounted.

[0021] The bearing frame is preferably attached to the air guide housing. The bearing frame preferably comprises a rectangular frame section through which fresh air can flow into the air inlet opening. A first guide section and a second guide section preferably extend from the frame section. The at least one closing flap is rotatably mounted on the guide sections.

[0022] According to another embodiment, the bearing frame has a locking flap seat against which at least one locking flap rests in the closed state.

[0023] The sealing flap seat is preferably a flat surface provided on the bearing frame, against which the at least one sealing flap rests in the closed state. If a first sealing flap and a second sealing flap are provided, each sealing flap is assigned its own sealing flap seat. This means, in particular, that a first sealing flap seat for the first sealing flap and a second sealing flap seat for the second sealing flap can be provided on the bearing frame. Specifically, the at least one sealing flap does not form a fluid-tight seal against the sealing flap seat in the closed state.

[0024] According to a further embodiment, the locking device has a first locking flap and a second locking flap, wherein the first locking flap and the second locking flap are rotatably mounted on the bearing frame about a common axis of rotation.

[0025] Preferably, each of the aforementioned guide sections of the bearing frame has an opening through which a bearing shaft passes. The first and second closure flaps are rotatably mounted on the bearing shaft about their common axis of rotation. As mentioned above, the term "at least one closure flap" includes both the first and second closure flaps. The first and second closure flaps are preferably designed and arranged in a mirror-symmetrical manner.

[0026] According to another embodiment, the first locking flap and the second locking flap each perform an opposing rotational movement when moved from the open state to the closed state and vice versa.

[0027] In other words, for example, the first locking flap can rotate clockwise when moving from the open to the closed position, whereas the second locking flap rotates counterclockwise when moving from the open to the closed position. Conversely, the first locking flap can rotate counterclockwise when moving from the closed to the open position, whereas the second locking flap rotates clockwise when moving from the closed to the open position. The first and second locking flaps thus move in opposite directions.

[0028] According to another embodiment, the float is mounted on the bearing frame in a linearly displaceable manner.

[0029] The float preferably has two block-shaped or cuboid-shaped guide ribs at its end face. These guide ribs are linearly mounted in guide grooves of the guide sections of the bearing frame. The float can thus move along the guide grooves towards or away from the frame section of the bearing frame. The at least one closure flap or flaps follow this linear movement of the float with their rotational movement. In other words, the linear movement of the float is converted into the rotational movement of the at least one closure flap or flaps.

[0030] According to another embodiment, at least one closure flap is spring-loaded in the direction of the open state by means of a spring element.

[0031] The spring element is preferably threaded onto the aforementioned bearing shaft. The spring element is, in particular, a torsion spring. Several spring elements may be provided. For example, two such spring elements are provided. If a first and a second closure flap are provided, these are jointly spring-biased towards the open position by means of the spring element. When the float now rises on the liquid, it pushes the at least one closure flap against a spring force of the spring element(s) from the open position to the closed position. A first and a second spring element are particularly preferred.

[0032] According to another embodiment, the float has at least one contact rib which contacts the at least one closure flap in order to move the at least one closure flap from the open state towards the closed state.

[0033] The spring element pre-tensions the at least one closure flap against the contact rib. The contact rib preferably has a round or rounded cross-section so that it can roll on the at least one closure flap. The contact rib preferably extends outwards from the top of the float. "Top" in this context means facing the at least one closure flap. If a first closure flap and a second closure flap are provided, the float has, in particular, a first contact rib associated with the first closure flap and a second contact rib associated with the second closure flap. The at least one contact rib is always in contact with the at least one closure flap. The same applies if several closure flaps and several contact ribs are provided.In other words, the spring element or elements tension at least one or more closure flaps against the float. If the float rises on the liquid, it moves against the spring force of the spring element.

[0034] According to another embodiment, the float has a cylindrical cross-section from which a buoyancy section extends radially.

[0035] In this context, "radial" means in a direction perpendicular to a central axis of the cylindrical cross-section. The buoyancy section increases the buoyancy area of ​​the float. This allows it to rise more quickly, for example, in the event of a surge of liquid. This results in faster closure of at least one valve. The buoyancy section may have a partially rounded or rounded cross-section.

[0036] According to a further embodiment, the air guide housing has a housing body and a housing cover that can be removed from the housing body, wherein an extraction unit is attached to the housing cover, and wherein a first closing device and a second closing device are attached to the extraction unit.

[0037] In other words, the cover in this case has exactly two locking devices. However, the cover can also have exactly one locking device. The housing cover can, for example, be snapped, latched, and / or screwed to the housing body. The extraction unit can be attached to the housing cover. For example, the housing cover has a connection flange onto which the extraction unit can be attached. A screw connection, a snap connection, and / or a latch connection can be provided. This allows for easy and quick installation and removal of the extraction unit. Ribs can also be arranged on the inside of the housing cover to channel water away and thus reduce water contact with the cab ventilation system. This is advantageous because it extends the service life of the cab ventilation system.

[0038] According to a further embodiment, the extraction unit has an extraction unit lower part attached to the housing cover and an extraction unit upper part removable from the extraction unit lower part, wherein the first closing device and the second closing device are attached to the extraction unit lower part, and wherein the extraction unit lower part has an air guide channel arranged between the first closing device and the second closing device.

[0039] In other words, the air duct runs between the first and second closure devices. The air duct can be attached to the aforementioned connection flange of the housing cover. The air duct supplies fresh air from the closure devices to the air duct housing, specifically the housing body.

[0040] According to another embodiment, the cover has a first fine filter located downstream of the first closure device and a second fine filter located downstream of the second closure device, wherein the first fine filter and the second fine filter are incorporated in the upper part of the extraction unit.

[0041] The upper part of the extraction unit is lid-shaped, allowing for easy replacement of the fine filters. The first fine filter is assigned to the first closure device, and the second fine filter to the second closure device. Incoming fresh air thus flows through the respective closure device and fine filter into the upper part of the extraction unit and from there through the air duct into the housing of the air duct housing. The upper part of the extraction unit is connected to the lower part of the extraction unit, for example, by a snap-fit ​​or click-fit connection. A screw connection may also be used. This allows for very easy replacement of the fine filters.

[0042] Furthermore, a commercial vehicle, in particular a military commercial vehicle, is proposed with a cab ventilation system and such a cover, wherein the cover covers the cab ventilation system.

[0043] The commercial vehicle can be a truck. In particular, the commercial vehicle is an off-road truck. The commercial vehicle is a multi-axle vehicle. The commercial vehicle can be a two-axle, three-axle, four-axle, or five-axle vehicle. The commercial vehicle preferably includes all-wheel drive. The commercial vehicle can therefore also be referred to as an all-wheel-drive commercial vehicle. The commercial vehicle can be a protected commercial vehicle. In this context, "protected" means, in particular, that the commercial vehicle is protected against gunfire, booby traps, improvised explosive devices (IEDs), mines, or the like. The commercial vehicle includes the driver's cab, which is supported by a chassis. The driver's cab ventilation system is part of the driver's cab. Furthermore, the commercial vehicle can have an interchangeable body, which is also supported by the chassis.The commercial vehicle can be armed or unarmed.

[0044] According to one embodiment, the cab ventilation system, including the cover, is arranged below a windshield of the commercial vehicle and in front of a central seat of the commercial vehicle.

[0045] This arrangement of the cab ventilation system allows for a particularly ergonomic design of the center seat, as the system can be positioned in a space-saving manner. The cover, which features a self-closing mechanism, ensures that the vehicle always maintains the necessary fording capability.

[0046] The embodiments and features described for the proposed cover apply accordingly to the proposed commercial vehicle and vice versa.

[0047] The term "one" here is not necessarily to be understood as restricting the number to exactly one element. Rather, it can also refer to multiple elements, such as two, three, or more. Similarly, every other counter used here should not be interpreted as restricting the number to the exact number stated. Instead, numerical deviations above and below this number are possible unless otherwise specified.

[0048] Other possible implementations of the cover and / or the commercial vehicle also include combinations of features or embodiments described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In such cases, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the cover and / or the commercial vehicle.

[0049] Further advantageous embodiments and aspects of the cover and / or the commercial vehicle are the subject of the dependent claims and the exemplary embodiments of the cover and / or the commercial vehicle described below. The cover and / or the commercial vehicle are further explained below with reference to preferred embodiments and the accompanying figures. Fig. Figure 1 shows a schematic side view of an embodiment of a commercial vehicle; Fig. Figure 2 shows a schematic front view of an embodiment of a driver's cab for the commercial vehicle according to Fig. 1; Fig. Figure 3 shows a schematic perspective view of a cover for a cab ventilation system according to Fig. 2; Fig. Figure 4 shows a schematic perspective exploded view of the cover according to Fig. 3; Fig. Figure 5 shows a schematic perspective view of an embodiment of a locking device for the cover according to Fig. 3; Fig. Figure 6 shows a schematic perspective exploded view of the locking device according to Fig. 5; and Fig. Figure 7 shows a schematic side view of the locking device according to Fig. 5.

[0050] In the figures, identical or functionally equivalent elements have been given the same reference symbols, unless otherwise indicated.

[0051] The Fig. Figure 1 shows a schematic side view of an embodiment of a commercial vehicle 1.

[0052] Commercial vehicle 1 is a land vehicle. Commercial vehicle 1 is specifically a military commercial vehicle. Commercial vehicle 1 can therefore also be referred to as a military commercial vehicle. Commercial vehicle 1 can be a truck. Specifically, commercial vehicle 1 is an off-road truck. Commercial vehicle 1 can be a protected vehicle. Therefore, commercial vehicle 1 can also be referred to as a protected commercial vehicle.

[0053] Commercial vehicle 1 is assigned a coordinate system with a longitudinal direction (x-direction), a transverse direction (y-direction), and a vertical direction (z-direction). The directions x, y, and z are oriented perpendicular to each other. The z-direction is oriented parallel to a gravity direction (g). The gravity direction (g) is oriented in the orientation of the Fig. 1. Oriented from top to bottom.

[0054] Commercial vehicle 1 is a wheeled vehicle. Commercial vehicle 1 comprises a chassis 2 with a plurality of axles 3, 4, 5, 6. Each of the axles 3, 4, 5, 6 is assigned at least one pair of wheels 7, 8, 9, 10. For example, four axles 3, 4, 5, 6 can be provided. This means that commercial vehicle 1 is a four-axle vehicle in this case. However, the number of axles 3, 4, 5, 6 is arbitrary. Commercial vehicle 1 can also be a two-axle, three-axle, or five-axle vehicle. Commercial vehicle 1 preferably includes all-wheel drive. This means that all axles 3, 4, 5, 6 can be driven. Commercial vehicle 1 can therefore also be referred to as an all-wheel-drive commercial vehicle. At least one of the axles 3, 4, 5, 6 is steerable. Preferably, two front axles or front axles 3 and 4 are steerable. Alternatively, all axles 3, 4, 5, and 6 can be steerable.

[0055] The chassis 2 carries a cab 11 of the commercial vehicle 1. The cab 11 can also be referred to as the driver's cab or driver's cabin. The cab 11 is preferably protected against gunfire, booby traps, improvised explosive devices (IEDs), mines, or the like. The cab 11 encloses an interior space 12 in which a crew of the commercial vehicle 1, for example, a driver and one or two passengers, can be located. The cab 11 encloses the interior space 12 and thus separates it from the surrounding area 13. The interior space 12 is accessible from the surrounding area 13 by means of openable doors 14.

[0056] The chassis 2 is suitable for carrying an interchangeable body 15 of the commercial vehicle 1 in addition to the driver's cab 11. The body 15 can be, for example, a flatbed, a container, a box body, a tank, or the like. In the Fig. Figure 1 shows a structure 15 in the form of a container.

[0057] The commercial vehicle 1 can move along a surface 17 in a direction of travel 16 using its wheels 7, 8, 9, 10. The direction of travel 16 is oriented opposite to the x-direction x. However, this does not preclude the commercial vehicle 1 from moving in the opposite direction of travel 16 on the surface 17 – for example, in reverse. The surface 17 can be a road or any type of terrain.

[0058] The Fig. Figure 2 shows a schematic front view of an embodiment of a driver's cab 11 as previously mentioned for the commercial vehicle 1.

[0059] The aforementioned coordinate system with directions x, y, z can also be assigned to the cab 11. The cab 11 comprises a mine-protected, in particular mine-protection-optimized, cab floor 18 and a cab shell 19, which is firmly connected to the cab floor 18. The cab floor 18 is, in particular, part of the cab shell 19. The cab shell 19 has a cab roof 20 arranged opposite the cab floor 18, two cab side walls 21, 22 arranged opposite each other, in particular a first cab side wall 21 and a second cab side wall 22, which may be equipped with doors 14 as mentioned above, a cab front wall 23, and a cab rear wall (not shown) arranged opposite the cab front wall 23. The cab front wall 23 may have a windshield 24. The windshield 24 can be divided into two windshield sections 25, 26.However, the windshield 24 can also be a single piece.

[0060] The cab floor 18 and the cab shell 19 enclose the interior 12. The interior 12 can be accessed from the surroundings 13 by means of the aforementioned doors 14 and / or hatches (not shown). A first seat 27, a second seat 28, and a third seat 29 are located within the cab 11 and thus within the interior 12. The first seat 27 can also be referred to as the driver's seat. The second seat 28 can also be referred to as the passenger seat. The third seat 29 can also be referred to as the middle seat, since, viewed along the y-direction y, it is positioned midway between seats 27 and 28.

[0061] Seats 27, 28, and 29 are positioned side-by-side and spaced apart along the y-direction y. The third seat, 29, is positioned above the first seat, 27, and the second seat, 28, along the z-direction z. The third seat, 29, can also be positioned centrally within the driver's cab 11 when viewed along the y-direction y. Seats 27, 28, and 29 are separate components and can be individually replaced. Therefore, seats 27, 28, and 29 do not form a continuous bench seat.

[0062] Viewed along the z-direction z, a cab ventilation system 30 is arranged below the windshield 24 and in front of the third seat 29, which is located in the Fig. Figure 2 is only very schematically indicated. With the help of the cab ventilation system 30, the interior 12 can be supplied with fresh air from the environment 13. The cab ventilation system 30 can be an air conditioning system or have an air conditioning system. This means that the interior 12 can be climate-controlled, in particular cooled and heated, with the help of the cab ventilation system 30. Furthermore, the cab ventilation system 30 can have various filter elements designed to filter, dehumidify, clean of particles and / or remove unwanted substances from the fresh air drawn in from the environment 13 and supply it to the interior 12 as clean air.

[0063] The Fig. Figure 3 shows a schematic perspective view of an embodiment of a cover 31 for the cab ventilation system 30. Fig. Figure 4 shows a schematic perspective exploded view of cover 31. The following refers to the Fig. 3 and Fig. 4 referenced simultaneously.

[0064] The cover 31 is removable and mounted on the cab ventilation system 30 and / or on the cab 11, in particular on the cab front wall 23. This can be achieved, for example, by a snap-fit ​​connection, a latch connection, and / or a screw connection. This allows easy access to the cab ventilation system 30, for example, for maintenance work. The cover 31 can also be referred to as the cab ventilation system cover.

[0065] The cover 31 ensures a certain fording capability of the commercial vehicle 1 by preventing the ingress of liquid, in particular water, into the cab ventilation system 30. In this context, "fording capability" refers to the suitability of the commercial vehicle 1 to cross a body of water up to a specified fording depth without any disruption, such as damage to the cab ventilation system 30. "Fording depth" refers to the maximum depth of water through which the commercial vehicle 1 can drive or wade.

[0066] The cover 31 includes an air duct housing 32, which allows fresh air from the environment 13 to be supplied to the cab ventilation system 30. The air duct housing 32 comprises a box-shaped housing body 33 and a housing cover 34 that can be removed from the housing body 33. The housing body 33 and the housing cover 34 can be made of plastic components, in particular injection-molded plastic components. The housing cover 34 can be screwed to the housing body 33. However, a snap-fit ​​or detent connection between the housing cover 34 and the housing body 33 can also be provided. This allows the housing cover 34 to be removed from the housing body 33 without tools.

[0067] A check valve 35 can be provided at the lowest point of the housing body 33 for draining any liquid, in particular water, that has entered or condensed in the air duct housing 32. The air duct housing 32 can be mounted on the driver's cab 11, in particular on the front wall 23 of the driver's cab, using two mounting guides 36, 37.

[0068] The housing cover 34 has a connection flange 38 to which an extraction unit 39 is mounted. The extraction unit 39 has an extraction unit base 40 mounted on the housing cover 34, in particular on the connection flange 38. The extraction unit base 40 has an air guide channel 41 which is in fluid communication with the connection flange 38. For example, the air guide channel 41 is pushed onto the connection flange 38, so that the connection flange 38 is located inside the air guide channel 41. A snap-fit ​​connection, a snap connection, and / or a screw connection can be provided between the air guide channel 41 and the connection flange 38.

[0069] The air duct 41 extends from the underside of a plate-shaped base section 42 of the extraction unit lower part 40. The base section 42 includes a first air inlet opening 43 and a second air inlet opening 44. The air inlet openings 43 and 44 can be grille-shaped. The air duct 41 runs between the air inlet openings 43 and 44. Thus, the air duct is positioned between the first air inlet opening 43 and the second air inlet opening 44 when viewed along the y-direction y.

[0070] In addition to the extraction unit base 40, the extraction unit 39 has an extraction unit top 45, which is removable from the extraction unit base 40 and is lid-shaped. The extraction unit top 45 is specifically box-shaped. The extraction unit top 45 can be connected to the extraction unit base 40. A snap-fit ​​connection, a snap-in connection, and / or a screw connection can be provided between the extraction unit top 45 and the extraction unit base 40.

[0071] The upper part 45 of the extraction unit contains a first fine filter 46 and a second fine filter 47. The fine filters 46 and 47 can be block-shaped or cuboid-shaped. The first fine filter 46 is assigned to the first air inlet opening 43, and the second fine filter 47 is assigned to the second air inlet opening 44. The fine filters 46 and 47 are arranged downstream of the air inlet openings 43 and 44.

[0072] A first closing device 48 and a second closing device 49 are mounted on the extraction unit 39, in particular on the lower part 40 of the extraction unit. The first closing device 48 is associated with the first air inlet opening 43, and the second closing device 49 is associated with the second air inlet opening 44. The closing devices 48 and 49 prevent a sudden surge of liquid, in particular water, into the air duct housing 32.

[0073] The locking devices 48, 49 can, for example, be screwed, latched, and / or snapped to the extraction unit base 40. The locking devices 48, 49 are arranged such that the air guide duct 41 of the extraction unit base 40, viewed along the y-direction y, is located between the first locking device 48 and the second locking device 49. The locking devices 48, 49 are preferably identical in construction. Therefore, only the first locking device 48, which will be referred to below simply as locking device 48, will be discussed below.

[0074] The Fig. Figure 5 shows a schematic perspective view of an embodiment of a locking device 48 as previously mentioned. Fig. Figure 6 shows a schematic perspective exploded view of the locking device 48. Fig. Figure 7 shows a schematic side view of the locking device 48. The following refers to the Fig. 5 to 7 were referenced simultaneously.

[0075] The locking device 48 comprises a bearing frame 50, which enables the locking device 48 to be mounted on the extraction unit base 40. For example, the bearing frame 50 can be snapped or latched to the extraction unit base 40. A screw connection may also be provided. This allows for quick assembly and disassembly of the locking device 48. The bearing frame 50 can be a plastic component, in particular an injection-molded plastic component.

[0076] The bearing frame 50 comprises a rectangular frame section 51, which is interrupted in the center by an opening 52. Fresh air from the environment 13 can flow into the air guide housing 32 through the opening 52. In the orientation of the Fig. 7. On the underside of frame section 51, a first locking flap seat 53 and a second locking flap seat 54 are provided. The locking flap seats 53, 54 are flat. For example, the locking flap seats 53, 54 are designed as surfaces provided on frame section 51.

[0077] Two guide sections 55 and 56 extend from the underside of frame section 51. The guide sections 55 and 56 are oriented perpendicular to frame section 51. A first guide section 55 and a second guide section 56 are provided. The guide sections 55 and 56 and the frame section 51 form a single component, specifically a component made entirely of the same material. In this context, "single component" or "one-piece" means, in particular, that the guide sections 55 and 56 and the frame section 51 are not separate sub-components, but rather form a single component, namely the bearing frame 50. "Made entirely of the same material" means that the bearing frame 50 is manufactured entirely from the same material.

[0078] The first guide section 55 has a first guide groove 57 extending along the z-direction. Accordingly, the second guide section 56 also has a second guide groove 58 extending along the z-direction. In the orientation of the Fig. Above the guide grooves 57, 58, a breakthrough 59, 60 in the form of a bore is provided in each guide section 55, 56. Accordingly, a first breakthrough 59 and a second breakthrough 60 are provided.

[0079] At least one locking flap 61, 62 is rotatably mounted on the bearing frame 50. However, it is particularly preferred that a first locking flap 61 and a second locking flap 62 are provided, which are rotatably mounted on the bearing frame 50. Viewed along the y-direction y, the two locking flaps 61, 62 are positioned between the two guide sections 55, 56. Alternatively, exactly one locking flap 61, 62 may be provided.

[0080] Each closure flap 61, 62 comprises a plate-shaped base section 63, 64 and a wall 65, 66 surrounding the respective base section 63, 64. With their walls 65, 66, the closure flaps 61, 62 can abut the end faces of the closure flap seats 53, 54 to close the air inlet openings 43, 44. The walls 65, 66 are U-shaped and extend at least partially around the respective base section 63, 64. The two walls 65, 66 of the closure flaps 61, 62 together form a frame-shaped geometry.

[0081] The closing flaps 61, 62 are mounted on the bearing frame 50 at their base sections 63, 64 by means of a common bearing axis 67. For this purpose, the bearing axis 67 is guided through tubular receiving sections 68, 69, 70, 71, 72, 73 provided on the closing flaps 61, 62, which extend from the base sections 63, 64, and through the openings 59, 60 of the guide sections 55, 56. To prevent the bearing axis 67 from slipping out of the openings 59, 60, end plugs 74, 75 are provided. The end plugs 74, 75 can be engaged or snapped into the openings 59, 60.

[0082] Spring elements 76, 77 are also associated with the locking flaps 61, 62. The spring elements 76, 77 can be threaded onto the bearing shaft 67. The spring elements 76, 77 are, in particular, torsion springs. The spring elements 76, 77 tension the locking flaps 61, 62 in the direction of a direction in the Fig. 5 and Fig. Figure 7 shows the open state Z1, in which the locking flaps 61, 62 do not rest against the locking flap seats 53, 54. A first spring element 76 and a second spring element 77 may be provided.

[0083] Furthermore, the closure device 48 comprises a float, buoyancy aid, or floating body 78. The floating body 78 is essentially cylindrical. The floating body 78 can be a hollow body. However, the floating body 78 can also be made as a solid body from a material with a low density, such as a plastic foam or cork. The floating body 78 is suitable for floating on a liquid, in particular on water. The floating body 78 can actuate the closure flaps 61, 62.

[0084] The float 78 has two block-shaped or cuboid guide ribs 79, of which in the Fig. Figures 5 to 7 show only one. The two guide webs 79 are arranged on both sides of the float 78 when viewed along the y-direction y. The guide webs 79 are received in the guide grooves 57, 58 of the bearing frame 50 such that the float 78 can move upwards and downwards along the z-direction z.

[0085] In the orientation of Fig. 6 and Fig. 7. A first contact rib 80 and a second contact rib 81 extend from the upper surface of the float 78. The first contact rib 80 is designed to contact the first closure flap 61. Similarly, the second contact rib 81 is designed to contact the second closure flap 62. Furthermore, a buoyancy section 82 extends radially from the float 78. The spring elements 76, 77 pre-tension the closure flaps 61, 62 against the contact ribs 80, 81, so that the closure flaps 61, 62 are always in contact with the float 78. This prevents rattling of the float 78, for example, due to vibrations.

[0086] The functionality of the locking device 48 is explained below. The locking flaps 61, 62 are initially located in the Fig. 5 and Fig. Figure 7 shows the open state Z1. In the open state Z1, the closing flaps 61, 62 do not rest against the closing flap seats 53, 54 of the bearing frame 50. This means that fresh air from the environment 13 can flow through the frame section 51 and through the air inlet openings 43, 44 into the air guide housing 32.

[0087] The spring elements 76, 77 bias the locking flaps 61, 62 in the direction of the open state Z1. This means, in particular, that the locking flaps 61, 62 are forced against a spring force of the spring elements 76, 77 from the open state Z1 into a closed state. Fig. The closed state Z2, shown with dashed lines, can be moved. In this case, the closing flaps 61 and 62 perform a rotational movement.

[0088] As the Fig.As shown in Figure 7, the float 78 is initially in state Z10, in which it is not yet floating on a liquid 83, for example, water. If the commercial vehicle 1 now travels through a body of water, the liquid 83 flows towards the float 78 in a surge, causing it to float on the liquid 83. The buoyancy section 82 facilitates this floating of the float 78 on the liquid 83. The float 78 is then moved from state Z10 to state Z20, in which it floats on the liquid 83.

[0089] As the float 78 rises on the liquid 83, it moves from state Z10 along the guide grooves 57, 58 towards state Z20, causing the contact ribs 80, 81 to push the closing flaps 61, 62 upwards against the spring force of the spring elements 76, 77. The float 78 then moves the closing flaps 61, 62 against the spring force of the spring elements 76, 77 from the open state Z1 to the closed state Z2.

[0090] In the closed state Z2, the sealing flaps 61, 62 rest against the sealing flap seats 53, 54, preventing the liquid 83 from entering the air guide housing 32. As they move from the open state Z1 to the closed state Z2, the sealing flaps 61, 62 rotate about a common axis of rotation 84.

[0091] The axis of rotation 84 can coincide with the bearing axis 67. The sealing flaps 61, 62 do not form a fluid-tight seal against the sealing flap seats 53, 54, but are only intended to prevent a surge of liquid 83 from entering the air guide housing 32. This means that a certain amount of liquid 83 can still enter the air guide housing 32. This amount of liquid 83 can be drained via the check valve 35.

[0092] The locking flaps 61 and 62 undergo opposing rotational movements when moved from the open state Z1 to the closed state Z2. In other words, the first locking flap 61 rotates clockwise when moved from the open state Z1 to the closed state Z2, whereas the second locking flap 62 rotates counterclockwise when moved from the open state Z1 to the closed state Z2. Conversely, the first locking flap 61 rotates counterclockwise when moved from the closed state Z2 to the open state Z1, whereas the second locking flap 62 rotates clockwise when moved from the closed state Z2 to the open state Z1.

[0093] Although the present invention has been described using exemplary embodiments, it can be modified in many ways. REFERENCE MARK LIST 1 commercial vehicle 2 chassis 3-axis 4-axis 5-axis 6-axis 7 wheel 8 wheel 9 wheel 10 wheels 11 Driver's cab 12 Interior 13 Environment 14 Door 15 Structure 16 Direction of travel 17 Underground 18 Cab floor 19 Cab shell 20 Cab roof 21 Cab side wall 22 Cab side wall 23 Cab front wall 24 Windscreen 25 Windscreen section 26 Windscreen section 27 Seat / Driver's seat 28 Seat / Passenger seat 29 Seat / Middle Seat 30 Cab ventilation system 31 Cover 32 air duct housings 33 Housing body 34 Housing covers 35 Check valve 36 Assembly instructions 37 Assembly instructions 38 Connection flange 39 Extraction unit 40 Extraction unit base 41 Air duct 42 Basic section 43 Air intake opening 44 Air intake opening 45 Extraction unit upper part 46 fine filters 47 fine filters 48 Locking device 49 Locking device 50 storage frames 51 Frame section 52 Breakthrough 53 Locking flap seat 54 Locking flap seat 55 Leadership section 56 Leadership section 57 Guide groove 58 Guide groove 59 Breakthrough 60 Breakthrough 61 Locking flap 62 locking flaps 63 Basic section 64 Basic section 65 wall 66 wall 67 Bearing axle 68 Recording section 69 Recording section 70 Recording section 71 Recording section 72 Recording section 73 Recording section 74 end plugs 75 end plugs 76 Spring element 77 Spring element 78 floats 79 Leading platform 80 contact rib 81 Contact rib 82 Lift section 83 Liquid 84 axis of rotation g Direction of gravity x x-direction / longitudinal direction y y-direction / transverse direction z z-direction / vertical direction Z1 condition Z2 condition Z10 condition Z20 condition

Claims

[1] Cover (31) for a cab ventilation system (30) of a commercial vehicle (1), in particular a military commercial vehicle, with an air guide housing (32), and a closure device (48, 49) to prevent the ingress of a liquid (83) into the air guide housing (32), wherein the closure device (48, 49) has a float (78) which floats on the liquid (83), wherein the closure device (48, 49) has at least one closure flap (61, 62) which can be moved from an open state (Z1), in which the at least one closure flap (61, 62) releases an air inlet opening (43, 44) of the air guide housing (32), to a closed state (Z2), in which the at least one closure flap (61, 62) closes the air inlet opening (43, 44), and vice versa, and wherein the float (78) is coupled to the at least one closure flap (61, 62) in such a way that the float (78) moves the at least one closure flap (61, 62) from the open state (Z1) towards the closed state (Z2) when the float (78) floats on the liquid (83). [2] Cover according to claim 1, characterized by , that at least one closure flap (61, 62) performs a rotational movement when moving from the open state (Z1) to the closed state (Z2) and vice versa. [3] Cover according to claim 2, characterized by , that the locking device (48, 49) has a bearing frame (50) on which at least one locking flap (61, 62) is rotatably mounted. [4] Cover according to claim 3, characterized by, that the bearing frame (50) has a locking flap seat (53, 54) against which at least one locking flap (61, 62) rests in the closed state (Z2). [5] Cover according to claim 3 or 4, characterized by , that the locking device (48, 49) has a first locking flap (61) and a second locking flap (62), wherein the first locking flap (61) and the second locking flap (62) are rotatably mounted on the bearing frame (50) about a common axis of rotation (84). [6] Cover according to claim 5, characterized by , that the first locking flap (61) and the second locking flap (62) each perform an opposite rotational movement when moving from the open state (Z1) to the closed state (Z2) and vice versa. [7] Cover according to one of claims 3-6, characterized by , that the float (78) is mounted on the bearing frame (50) so as to be linearly displaceable. [8] Cover according to any one of claims 1-7, characterized by , that at least one closure flap (61, 62) is spring-loaded in the direction of the open state (Z1) by means of a spring element (76, 77). [9] Cover according to any one of claims 1-8, characterized by , that the float (78) has at least one contact rib (80, 81) which contacts the at least one closure flap (61, 62) in order to move the at least one closure flap (61, 62) from the open state (Z1) towards the closed state (Z2). [10] Cover according to any one of claims 1-9, characterized by , that the float (78) has a cylindrical cross-section from which a buoyancy section (82) extends radially. [11] Cover according to any one of claims 1-10, characterized by, that the air guide housing (32) has a housing body (33) and a housing cover (34) removable from the housing body (33), wherein an extraction unit (39) is attached to the housing cover (34), and wherein a first closing device (48) and a second closing device (49) are attached to the extraction unit (39). [12] Cover according to claim 11, characterized by , that the extraction unit (39) has an extraction unit lower part (40) attached to the housing cover (34) and an extraction unit upper part (45) removable from the extraction unit lower part (40), wherein the first closing device (48) and the second closing device (49) are attached to the extraction unit lower part (40), and wherein the extraction unit lower part (40) has an air guide channel (41) arranged between the first closing device (48) and the second closing device (49). [13] Cover according to claim 12, characterized bya first fine filter (46) which is placed downstream of the first closing device (48) and a second fine filter (47) which is placed downstream of the second closing device (49), wherein the first fine filter (46) and the second fine filter (47) are accommodated in the upper part (45) of the extraction unit. [14] Commercial vehicle (1), in particular military commercial vehicle, with a cab ventilation system (30) and a cover (31) according to one of claims 1-13, wherein the cover (31) covers the cab ventilation system (30) and is removable from it. [15] Commercial vehicle according to claim 14, characterized by , that the cab ventilation system (30) together with the cover (31) is arranged below a windshield (24) of the commercial vehicle (1) and in front of a central seat (29) of the commercial vehicle (1).

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