• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY The invention relates to a device for ventilation of the engine compartment (5) of a particular vehicle (1), preferably comprising a housing (4) gearbox (3) or enclosure which separates the engine (2) and from the other parts of the vehicle (1) such as from the cooling shaft and to which housing (4) is connected a ventilation duct (10) which directs air from the engine compartment (5) to the surroundings of the vehicle (1). The invention is achieved in that the inlet (14) of the ventilation duct (10) is arranged at the upper part of the housing (4) and that the outlet (11) of the ventilation duct (10) is arranged at or through the rear side (12) of the vehicle (1), preferably near but below the roof of the vehicle (13) where the underpressure due to speed wind and vortex formation is usually greatest and which negative pressure affects / increases the air flow through the ventilation duct (10) and thus the air flow through the engine compartment (5). (Figure 1)
    公开号:SE1450802A1
    申请号:SE1450802
    申请日:2014-06-30
    公开日:2015-12-31
    发明作者:Lennart Boethius；Andreas Forsell
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    Is reduced. If the size of the air intakes is reduced, there will be problems with poorer cooling or alternatively larger energy-consuming fans must be used.
    A common method today for cooling an engine compartment is that the air that the cooling fan draws in from the surroundings through the radiator package also passes through the engine compartment. However, as can be easily seen, that air is already hot because it has taken up energy from cooling water during the passage through the radiator and that air therefore does not cool the engine compartment efficiently enough.
    According to known technology, there are also other strategies for ventilating an engine compartment. The most common way is that the cooling fan sucks in ambient air through the radiator package. This creates an overpressure in the engine compartment which is then ventilated out through openings in the body, usually via one or more high-positioned outlet openings or ventilation grilles in the vehicle's, rear-mounted, engine cover. Of course, it is also possible to arrange a fan which, on the contrary, pushes the air from the engine compartment out through the radiator package. A negative pressure is then formed in the engine compartment which causes colder ambient air to be sucked into the engine compartment via ventilation grilles arranged therefor. However, such a system provides less cooling in the radiator package and also often leads to a dirtier engine compartment because a large amount of dusty / dirty air is then sucked directly into the engine compartment. In these cases, the fan air is pushed or sucked directly into or out of the engine compartment to cool it.
    Today's known solutions mean that you are forced to choose between a warmer engine compartment and better cooling performance in the radiator package or a cooler engine compartment but with poorer cooling performance in the radiator package and unfortunately with a dirtier engine compartment.
    To counteract the said problem, it is possible to separate the cooling air flow through the radiator package from the flow through the engine compartment. But this means that the air flow around the engine 10 15 20 25 30 35 risks decreasing or becoming more or less stagnant and unwanted and harmful heat accumulations can then occur.
    This is especially a risk factor when operating at low speeds, which often occurs in commercial traffic such as in bus traffic. Well-sized ventilation openings adjacent to the vehicle's engine compartment can counteract this unwanted heat build-up, but its effect is often insufficient and, as mentioned, also leads to an unfavorable increased emission of sound and a dirtier engine compartment.
    It is important that these disadvantages are reduced. Rising demands for lower noise emissions mean that the ventilation openings in the vehicle's outer body must be reduced / reduced.
    The problem is thus to design a ventilation system that reduces the emission of disturbing noise from the vehicle but which at the same time leads to better cooling of both the engine compartment and the radiator package and which still does not result in more dirt and dust being led into the engine compartment.
    A number of attempts have been made in the past to solve these problems and to propose a ventilation system which reduces the emission of disturbing noise from the vehicle but which maintains or improves the cooling of both engine compartment and radiator package without causing more dirt and dust to be led into the engine compartment. .
    GB2045183 describes, for example, a cooling system for an engine comprising a radiator and a fan motor. The radiator and fan are separated from the engine compartment and the heated air that has passed the radiator is led out of the vehicle and into the surrounding air without passing the engine compartment. The exhaust gases are also allowed to mix with this air and thus a reduction of disturbing noise from the vehicle is achieved. A disadvantage of this system is that the engine compartment is not cooled efficiently. In addition, part of the cooling air must be used here to cool the vehicle's exhaust pipe.
    SE532810 describes a device for engine room ventilation which comprises a radiator package and a cooling fan which affects the air flow through the radiator package. The radiator package is shielded from the engine compartment and the cooling fan also sucks air from the engine compartment through a duct or opening arranged therefor. Due to the negative pressure formed in the engine compartment, ambient air is sucked into the engine compartment via at least one opening between the engine compartment and the outside of the vehicle, and results in overtemperatures in the engine compartment being avoided. A disadvantage of this system is that a larger fan motor must be used so that it can handle the larger amount of air. A larger fan motor requires more energy to operate.
    EP0735252 further discloses a cooling system for an engine in a commercial vehicle. The engine compartment is separated from the cooling system by a sound barrier. The engine compartment and cooling system receive air from the surroundings through various inlets. The cooling fan is equipped with a diffuser that causes air to be sucked out of the engine compartment and led out of the vehicle together with the air that has passed the radiator package. The disadvantage of this system is that here too a larger fan motor is required so that it is able to handle the larger amount of air that must flow through both the radiator package and the engine compartment.
    US6523520 describes yet another variant of a cooling system for an engine which is delimited from the cooling system. A cooling fan located at the vehicle's radiator sucks air simultaneously through the cooling package and from the engine via a duct system arranged therefor. The duct system directs ambient air past particularly hot parts of the engine before it is led out through an outlet opening in the vehicle. 10 15 20 25 30 35 Thus, known technology does not show a ventilation system which reduces the emission of disturbing noise from the vehicle and which at the same time maintains or improves the cooling of both engine compartment and radiator package without causing more dirt and dust to be led into the engine compartment and which is also energy efficient. .
    SUMMARY OF THE INVENTION An object of the invention is thus to solve the above-mentioned problems and to demonstrate a ventilation system which reduces the emission of disturbing noise from the vehicle to the surroundings but which at the same time maintains or improves the cooling of both engine compartment and radiator package.
    A further object of the invention is that the construction should require as little energy as possible for its operation.
    A further object of the invention is that the construction should also reduce the amount of dirt and dust that is led into the engine compartment.
    A further object of the invention is that the solution should be in principle simple and the parts simple and cost-effective to manufacture.
    These and further objects and advantages are achieved according to the invention by means of a ventilation device defined by the features stated in the characterizing part of the independent claims 1 and 8.
    The invention is thus particularly intended for commercial vehicles such as buses, but can of course be used for other vehicles such as trucks, construction machinery or other similar types of vehicles with similar problems. The solution according to the invention applies in particular to engine installations where the cooling fan and the radiator package are located in a separate cooling air shaft arranged next to the engine and gearbox. Since the cooling air shaft is completely separated from the engine compartment, the hot fan air, which has passed the radiator package, will not mix with the air flowing into the engine compartment and the fan can therefore not be used directly to create a ventilation of the engine compartment.
    The invention is thus achieved by arranging an engine compartment ventilation in a vehicle comprising a ventilation duct from the upper part of the engine compartment and extending upwards and having its ventilation duct outlet arranged out through the rearwardly facing body surface or body part of the vehicle, preferably above the vehicle tailgate and preferably relatively near the roof edge of the vehicle. During the vehicle's propulsion, a negative pressure is created in this area by the vehicle, which in turn creates a negative pressure in the ventilation duct. This creates an air flow through the ventilation duct and the engine compartment. The negative pressure increases with increasing vehicle speed, due to the influence of the wind, and this affects the air flow through the engine compartment to an increasing degree.
    The negative pressure at the ventilation duct outlet thus generates a flow out of the ventilation duct, which in turn leads to ambient air being sucked into the engine compartment, preferably via at least one opening between the engine compartment and the outside / underside of the vehicle.
    Advantages of the construction according to the invention are that a passive ventilation of the engine compartment occurs without the need for extra fans or larger fans which of course consume energy and thus would make the vehicle less energy efficient to drive. An advantage of the ventilation being supported by the negative pressure behind the vehicle, and the ejector effect this results in, is that when the vehicle starts from, for example, a stop, the ventilation will start up immediately before the engine compartment has warmed up and thus before the natural convection in the engine compartment. and the ventilation duct 10 15 20 25 30 35 has time to create a flow out through the ventilation duct. The cooling of the radiator package is also not affected by this construction.
    A further advantage of the solution according to the invention is that it becomes very reliable at the same time as it requires a relatively small installation space. This makes the solution cheap to implement in, for example, new production of vehicles.
    Further features and advantages of the invention will become apparent from the following, more detailed description of the invention, and from the accompanying drawings and other claims.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention is described in more detail below in some preferred embodiments with reference to the accompanying drawings.
    Figure 1 shows in cross-section and from the side, a rear part of a bus where its engine / gearbox and their enclosure protrude.
    Figure 2 shows the same picture as in figure 1, but where the enclosure also includes an additional air intake located in the side of the vehicle.
    Figure 3 shows a section through a part of the vehicle's propeller shaft and its bushing in the enclosure housing, and where the propeller shaft is provided with a sound and particle barrier.
    Figure 4 shows the same image as in figure 3 but with an alternative design of the sound and particle barrier mounted on the propeller shaft.
    DESCRIPTION OF PREFERRED EMBODIMENTS Figure 1 shows in cross section and from the side, a rear part of a vehicle, here a bus 1, where its engine 2 and gearbox 3 are placed in an enclosure or housing 4 separating the driveline from the other parts of the vehicle 1 and its surroundings and forms a substantially closed engine compartment 5. A cardan shaft 6 transmits the torque from the engine 2 and its gearbox 3 to the drive wheels 7. The housing 4 can advantageously be sound-insulated with a dedicated sound-insulating mat (not shown) preferably provided at the inside of the housing 4.
    An air inlet 8 to the engine compartment 5 is advantageously located low in the bus 1, for example as here down at the propeller shaft 6, and is suitably designed so that air passes in at or near the lead-through of the propeller shaft 6 in the wall 9 of the housing 4.
    The incoming air flows around the engine 2 and when it is heated by the various parts of the engine 2, such as turbochargers, exhaust manifolds, etc. (not shown), it rises due to natural convection upwards in the engine compartment 5 and reaches the roof of the housing 4. An outlet to a ventilation duct 10 is arranged in or near the roof. The ventilation duct 10 extends from the engine compartment 5 upwards and preferably to the rear and opens by means of a ventilation outlet 11 through the rear wall portion 12 of the vehicle, preferably in the rear body surface but close the roof 13 of the vehicle where the negative pressure during operation / travel is usually greatest due to the wind. The opening 14 of the ventilation duct in the upper part of the engine compartment 5 is advantageously placed so that very hot air from e.g. the turbocharger or manifold rises directly into the ventilation duct 10 without first being moved around the engine compartment 5 and there heating other heat-sensitive components.
    At the ventilation outlet 11, through the air flow around the vehicle, a negative pressure is formed which increases / decreases in relation to the speed of the vehicle. The negative pressure draws air out of the ventilation duct 10 and thus out of the engine compartment 5.
    Figure 2 shows in principle the same picture as figure 1, but where an additional air intake 15 is located in the body side of the vehicle. This extra air intake 15 helps a larger volume of air to pass into and flow through the engine compartment 5 and the extra air intake 15 can also be placed near particularly sensitive components that need a cooler environment or better cooling to extend the service life such as for example rubber articles in the driveline suspension, electrical components, etc.
    A sound and particle barrier 16 in the form of a flange or collar in front of the air intake 8 of the engine compartment 5 is arranged here on the propeller shaft 6. This prevents some particles and pollutants from following the air flow straight into the engine compartment 5.
    Figure 3 shows a section through a part of the cardan shaft 6 of the vehicle and its passage through the front wall 9 of the housing 4. The cardan shaft 6 has thus been provided with a sound and particle barrier 16 which is placed in front of the air intake 8 and in such a way that it at least partially covers the air intake 8 seen in the direction of the air flow. The sound and particle barrier 16 rotates with the PTO shaft 6 and reduces sound emissions from the engine compartment 5 at the same time as some particles from the roadway and surroundings are prevented from following the air into the engine compartment 5.
    Figure 4 shows in principle the same picture as figure 3 but with an alternative design of the sound and particle barrier 16. Here the flange has a cone-shaped flange surface which can also be provided with wings 17, which provide a fan action which throws particles radially out from the propeller shaft 6. the amount of particles that follow the air into the engine compartment 5. The front wall surface 9 of the housing 4 can also be designed cone-shaped to adapt to the sound and particle barrier 16. Advantages of the described solution are that a passive ventilation of the engine compartment 5 is achieved without additional fans or other devices need to be used that consume energy.
    An advantage of the ventilation being controlled by a negative pressure outside the vehicle is that when the vehicle / bus 1 starts from a stop, the ventilation starts before the entire engine compartment 5 is heated and the natural convection in the ventilation duct 10 has time to create a "draft" and thus a ventilation of the engine compartment 5.
    The solution also minimizes the requirement for built-in space in the vehicle and also pours the sound emissions from the vehicle at an acceptable level. Due to the natural convection, the ventilation system also cools the engine compartment 5 after the engine has been switched off, after a so-called "hot shut down".
    The description above is primarily intended to facilitate the understanding of the invention and is of course not limited to the stated embodiments, but other variants of the invention are also possible and conceivable within the scope of the inventive concept and the scope of subsequent claims.
    权利要求:
    Claims (1)
    [1]
    1. 0 15 20 25 30 35 11 CLAIMS 1. Device for ventilation of in particular a vehicle 2. 3. 4 (1) engine compartment (5) preferably comprising a housing (4) or enclosure separating engine (2) and gearbox (3 ) from the other parts of the vehicle (1) such as from its cooling shaft and to which housing (4) is connected a ventilation duct (10) which leads air from the engine compartment (5) to the surroundings of the vehicle (1), characterized in that the inlet (10) of the ventilation duct (10) 14) is arranged at (10) (1) preferably near but below the upper part of the housing (4) (11) and that the outlet of the ventilation duct is arranged at or through the rear side of the vehicle (12), the roof of the vehicle (13) where the negative pressure due to of wind speed and vortex formation is usually greatest and which negative pressure affects / increases the air flow through the ventilation duct (10) and thus increases the air flow through the engine compartment (5). Device according to claim 1, characterized in that the ventilation duct (10) is arranged to facilitate an air flow by natural convection when the air in the engine compartment (5) is heated. Device according to claim 1 or 2, characterized in that it is arranged at or near a sound and particle barrier (16) near the air inlet (8) of the engine compartment (5). Device according to one of the preceding claims, characterized in that the sound and particle barrier (16) is arranged at the cardan shaft (6) of the vehicle and is arranged to at least partially cover the air inlet (8) of the engine compartment (5), seen in the flow direction of the air flow. Device according to one of the preceding claims, characterized in that the sound and particle barrier (16) is arranged to rotate with the cardan shaft (6) of the vehicle. Device according to one of the preceding claims, characterized in that the sound and particle barrier (16) is designed as a flange or collar. Device according to one of the preceding claims, characterized in that the sound and particle barrier (16) is provided with wings (17). Vehicle comprising a device according to one or more of the device claims 1-7.
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    同族专利:
    公开号 | 公开日
    SE539042C2|2017-03-28|
    DE102015008250A1|2015-12-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB2045183B|1979-03-13|1983-05-05|Aveling Barford Ltd|Silencing and cooling vehicle engines|
    US5590624A|1995-03-31|1997-01-07|Caterpillar Inc.|Engine cooling systems|
    US6523520B1|2001-01-22|2003-02-25|Probir Chatterjea & Associates, Inc.|Engine cooling and noise suppression system|SE540084C2|2016-07-04|2018-03-20|Scania Cv Ab|Ventilation device for venting a space, in particular an engine room of a vehicle|
    法律状态:
    2021-03-02| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1450802A|SE539042C2|2014-06-30|2014-06-30|Device for engine room ventilation with self-draw|SE1450802A| SE539042C2|2014-06-30|2014-06-30|Device for engine room ventilation with self-draw|
    DE102015008250.7A| DE102015008250A1|2014-06-30|2015-06-26|Device for engine compartment ventilation with natural draft|
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