Ventilation – Vehicle – Having outlet airway
Patent
1999-01-15
2000-10-17
Joyce, Harold
Ventilation
Vehicle
Having outlet airway
B60H 124
Patent
active
06132308&
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a forced ventilation system for equalizing the pressure between the passenger compartment and surroundings of a motor vehicle, the system including a frame made of hard plastics and delimiting an aperture, and a flat ventilation flap made of an elastomer material and secured to the frame, a resilient restoring force counteracting opening movement of the ventilation flap from a closed position in which the ventilation flap rests on the frame and closes the aperture in the frame. In the motor vehicle the frame is arranged in an opening of the body of the vehicle, a loop-shaped sealing lip generally caring for a sealed connection of the frame to the body of the vehicle.
The function of such a forced ventilation system is to avoid the build up of pressure in the passengers compartment of the motor vehicle. Such a pressure build up can be caused by the ventilation of the moving motor vehicle, a running ventilator in a standing motor vehicle, the doors of the motor vehicle being slammed shut, and also by the air bag of the motor vehicle being blown up. In any of these cases, a forced ventilation system cares for an equalization of pressure between the passengers compartment and the surroundings of the motor vehicle, so that by the ventilation or the running ventilator, respectively, fresh air can at all be brought into the motor vehicle, a closing of the door is not hindered by the counter pressure in the motor vehicle, and no health injuring pressure peaks occur with the airbag being blown up explosively.
A known forced ventilation system of the kind stated at the beginning has three parts which are at first produced separately and than put together before their common installation at the motor vehicle takes place. Here, there are the frame made of hard plastics, the ventilation flap made of elastomer material and a sealing made of a foam material. Securing the ventilation flap and the sealing to the frame is laboriously and error-drawn as precisely defined conditions have to be kept to the end that the ventilation flap is biased into its closed position closing the aperture in the frame by a small but defined restoring force. This restoring force is important for that no exhaust gases or undesired cold air gets through the forced ventilation system into the passengers compartment of the motor vehicle. This is particularly important when the motor vehicle is standing when no ventilation of the passengers compartment occurs by the driving motion. At the same time the restoring force must not be too strong to not hinder the desired equalization of pressure between the passengers compartment and the surroundings of the motor vehicle.
In another known forced ventilation system according to the type described at the beginning, a loop-shaped sealing lip made of an elastomer material is injection-moulded to the frame at its side opposite to the ventilation flap. This avoids the mounting labour for the sealing. However, the more difficult mounting of the ventilation flap must still be carried out in a separate step after its production.
The invention is based on the task to disclose a forced ventilation system according to the type described at the beginning, which can with particularly low efforts be produced ready for being built in the motor vehicle.
According to the invention this task is solved, in that the ventilation flap is injection-moulded to the frame. That the thus resulting simple and production-advantageous formation of the forced ventilation system is possible at all, is surprising to those skilled in the art, as the ventilation flap in its closed position rests on the frame and therefore can not be injection moulded to the frame in the closed position. On the other hand, injection-moulding of the ventilation flap to the frame in an opened position leads to difficulties with regard to the desired resilient restoring force, which is provided for biasing the ventilation flap into its closed position, as normally an elastic restoring force would have to be overcome to bring the ventil
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Dietz Michael
Heidel Joachim
Hildebrand Thorsten
Boles Derek S.
Joyce Harold
Wegu-und Kunststoffwerke GmbH & Co. KG
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