Air flow device for a motor vehicle
a technology for venting mechanisms and motor vehicles, which is applied in the direction of flexible wheel components, valve construction, manufacturing tools, etc., can solve the problems of different degrees of obstruction and grating over its area, and achieve the effect of improving the noise generated by the venting mechanism
Inactive Publication Date: 2005-09-15
DAIMLER AG
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Benefits of technology
The invention is a venting mechanism for a motor vehicle that has an air channel with a grating that covers the entire flow cross section. The grating has openings that are distributed uniformly and have different degrees of obstruction. The grating is positioned close to the flow obstacle to equalize flow differences caused by the obstacle. The grating has equalization zones with high and low degrees of obstruction to achieve a uniform flow and low flow resistance. The grating is designed to have different degrees of obstruction in the reduced-flow area and flow-through area, which results in a smooth transition between the two areas. The grating can be adjusted to regulate the degree of obstruction and improve noise generated by the venting mechanism. The venting mechanism can be installed in limited space and has a smaller required installation space than existing solutions.
Problems solved by technology
The uneven distribution of openings results in the grating having different degrees of obstruction over its area.
The resulting differences in flow cross sections in the area of the grating result in the different degrees of obstruction.
Method used
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Embodiment Construction
[0017]FIG. 1 shows a sectional diagram through a venting mechanism having an air channel 1, which is bordered by its housing 1.1 across its longitudinal extent. The air channel 1 has air flowing through it along the arrow shown here. The remaining course of the air channel upstream is not shown in the drawing. The air channel 1 is bordered at the downstream end by the end opening 1.2. Upstream from the end opening 1.2, a grating 2 extending across the entire cross-sectional area of the air channel is arranged across the direction of flow. Due to the arrangement at a distance from the end opening, the grating is additionally covered by air baffles. The grating 2 has openings 2.1 and / or 2.3 and grating webs 2.2 and / or 2.4. The openings 2.1 arranged adjacent to the channel wall (shown in cross section in the sectional diagram) have a smaller open cross section than do the openings arranged at a distance from the two sectional channel walls. Likewise, the webs 2.2 of the grating 2 arran...
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A venting mechanism for a motor vehicle having an air channel and a grating which covers the flow cross section of the air channel, a flow obstacle being arranged upstream from the grating. In order to equalize the flow in the flow cross section with the lowest possible pressure drop, in particular when only a small installation space is available, the grating has an uneven arrangement of openings so that a high degree of obstruction is achieved in a reduced-flow area of the venting cross section and a low degree of obstruction is achieved in a flow-through area of the ventilation cross section.
Description
[0001] This application claims the priority of German patent application 102004003196.716, filed Jan. 22, 2004, the disclosure of which is expressly incorporated by reference herein. BACKGROUND AND SUMMARY OF THE INVENTION [0002] This invention relates to a venting mechanism for a motor vehicle. [0003] Such a venting mechanism is disclosed in European Patent EP 672 551 B1. This venting mechanism has an air channel bordered in the area of its outlet opening by a grating that completely covers the flow cross section. To provide the outflow cross section of the air channel with zones of diffuse outflow at one end and with a direct oncoming flow in the form of streams, the cover grating has nozzle-like openings of identical design distributed uniformly in the respective zones, said openings either becoming wider in the manner of the diffuser in the direction of flow or becoming narrower in the manner of jet nozzles. Diffuser openings and nozzle openings have approximately the same diame...
Claims
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IPC IPC(8): B60H1/34B61D27/00
CPCB60H1/3407B60H1/34
Inventor AROLD, KLAUS
Owner DAIMLER AG