Engine compartment ventilating arrangement

#The present invention relates to a ventilating arrangement and more particularly to a ventilating arrangement for an engine compartment of a liquid cooled, supercharged internal combustion engine whereby the cooling fluid for ventilating of the internal combustion engine compartment is return-flow cooled in a cooler by means of surrounding or ambient air.

#Ventilating arrangements are known wherein a part of the air quantity for the ventilation of the engine compartment is taken from the cooling air, brought to a high pressure level by a cooling blower and then reduced to a low pressure sufficient for the ventilation of the engine compartment. This conventional construction is disadvantageous since, on the one hand, the energy which must be produced by the cooling blower for applying a part of the volume of cooling air to a high pressure level is lost and, on the other hand, a cooling blower having a large blower output is required resulting in unnecessary operating and manufacturing costs.

#It is an aim of the present invention to provide a ventilating arrangement for an engine compartment of an internal combustion engine which avoids the aforementioned shortcomings encountered in the prior art.

#These and other objects, features, and advantages of the present invention will become more apparent from the following description when taken in connection with the accompanying drawing which shows, for the purposes of illustration only, one embodiment in accordance with the present invention, and wherein:

#FIG. 1 is a plan view of a ventilating arrangement in accordance with the present invention taken along the line I--I of FIG. 2;

#FIG. 2 is a view of the ventilating arrangement according to the present invention taken along the line II--II of FIG. 1.

#Referring now to the drawings wherein like reference numerals are used in both views to designate like parts, and more particularly to FIG. 1, according to this Figure, an annular or ring-shaped cooler 11 having a plurality of cooling fins is arranged in an air guiding housing 14 separated by a wall 12 from an engine compartment 13 housing an internal combustion engine (not shown).

#As shown in FIGS. 1 and 2, an air opening or aperture 20 is provided in the wall 12 of the air guiding housing 14 at a position directly adjoining a finnless sector 19 of the ring cooler 11. An air impeller mounted on a drive shaft 16 is driven by a suitable drive mechanism (not shown) whereby air from the surroundings is drawn through an air inlet 17 by the rotating impeller 15. As indicated by the air flow arrows in FIGS. 1 and 2, a compressed cooling air from the air inlet 17 flows radially through the fins of a ring cooler 11 with a portion of the drawn-in volume of cooling air being discharged to the atmosphere through a discharge opening 18 formed in the air guiding housing 14.

#The remaining portion of the drawn-in cooling air is directed through sector 19 and opening 20 to the engine compartment 13. In order to throttle the compressed cooling air arriving at the opening 20 profitably to a lower pressure required for the engine compartment ventilation, a charging air cooler 21 is arranged directly adjacent the opening and, preferably, outside the air guiding housing 14 which is passed through by the volume of cooling air for the engine compartment 13.