Ventilation – Vehicle – Condensation preventer
Patent
1999-10-26
2000-12-19
Ferensic, Denise L.
Ventilation
Vehicle
Condensation preventer
454 69, 251251, 251263, 251305, 251294, 251279, B60S 154
Patent
active
061621196
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND TO THE INVENTION AND STATE OF THE ART
The invention relates to an arrangement for controlling the supply of inlet air to a vehicle. The arrangement incorporates a control unit arranged to indicate and initiate supply of intake air to at least three intake air regions in the vehicle, and a control arrangement which is designed depending on the setting of the control unit, to control dampers situated in ducts which lead to said intake air regions. This control arrangement incorporates a cam arrangement which is designed to control an arm, arranged for each intake air region, for variable setting of at least one of said dampers between an open and a closed position.
Ventilation arrangements in vehicles which supply intake air to three intake air regions, which in a vehicle are usually a defroster region, a panel region and a floor region, are commonly subject to the limitation that the intake air cannot be distributed simultaneously, and in desired quantities, to said intake air regions.
A known ventilation arrangement according to GB 2 212 587 B incorporates a rotatable control unit arranged to initiate and supply intake air to three intake air regions. That control unit can only distribute intake air to at most two regions simultaneously. The rotary motion of the control unit is transmitted via a cable to a control arrangement which incorporates a cam arrangement for controlling arms which incorporate dampers for said intake air regions. This cam arrangement incorporates a cam device with three recesses for controlling the respective arms. This form of cam arrangement does not make it possible to eliminate the aforesaid limitation.
Another known ventilation arrangement supplying intake air to said three intake air regions in a vehicle uses three separate control devices, one for each intake air region. Each of these three control devices is moved individually along its separate path and separately controls its control arrangement in order to distribute intake air to the respective region. This control unit makes it possible for intake air to be supplied entirely variably to said intake air regions. It has disadvantages in that it occupies a large amount of space on the instrument panel and involves three separate control arrangements.
In heavy-duty vehicles it is often desirable to keep down the number of electronically controlled components, so the present invention relates to a mechanical arrangement for controlling the intake air supply in the vehicle.
SUMMARY OF THE INVENTION
The object of the present invention is to provide, for supplying intake air to a vehicle, an arrangement of the kind mentioned in the introduction which makes it possible for intake air to be supplied simultaneously with a desired distribution to said three intake air regions.
This object is achieved by the arrangement in the vechile housing indicated in the introduction which is characterised in that the cam arrangement incorporates at least two movable cam devices each incorporating an external cam surface with a cam height which varies along the cam surface, while each of said arms is designed, via a contact device, to bear upon and be acted upon by whichever of the cam surfaces of the two cam devices exhibits the greater cam height in the region of the contact device. The fact that two movable cam devices are used thus makes it possible to supply and distribute intake air to three different intake air regions in any desired manner.
According to an advantageous embodiment of the invention, said cam devices are substantially identical in form and movable independently of one another. At the same time, it may for reasons of space be practical for said cam devices to be arranged to be rotatable about a common spindle. The cam devices may also consist of two cam discs arranged in parallel.
According to a further advantageous embodiment of the invention, each of the arms is arranged so that, via the contact device, it bears flexibly on said cam surface. This enables the contact device to be raised from whichever of the
REFERENCES:
patent: 4936159 (1990-06-01), Kallio
patent: 5797585 (1998-08-01), Auvity
Davidsson Staffan
Kascha Adolf
Ferensic Denise L.
Lu Jiping
Scania CV Aktiebolag
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