Plastic housing

Automatic temperature and humidity regulation – Cooling radiator – Bypass

Patent

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Details

156 735, 251366, F01P 714

Patent

active

058993789

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a housing of plastic comprising an upper part, a bottom part and an adjusting element arranged between the two parts, wherein the position of the adjusting element is fixed during assembly.
A plastic housing of this kind can be used in particular for correctly positioning a wax thermostat in the correct axial position in an adjusting valve housing for controlling the temperature of the intake air of mixture--compressing internal combustion engines.
A device for controlling the temperature of intake air is disclosed in DE-PS 28 16 727. In this device there is a wax thermostat in a two part housing, the two parts being screwed together. In order to position the wax thermostat, the one housing part is rotated relative to the other until the correct position is reached. Then this position is fixed and sealed with an appropriate substance, such as an adhesive, for example. It is apparent that this adjustment is very expensive, both as regards the material (additional brass screw) and as regards the effort required for assembly, and there is no absolute assurance of the required tightness of sealing or against subsequent undesired rotation or change in position.


SUMMARY OF THE INVENTION

It is therefore the object of the invention to provide a housing made of plastic with which the setting of an adjusting element can be performed in a simple manner, and after which the setting will no longer be able to change as a result of environmental or other influences.
This object is achieved by providing a plastic housing comprising an upper part, a bottom part and an adjusting element arranged between the two parts, in which the position of the adjusting element is fixed during assembly, and the positioning of the adjusting element is carried out by welding the upper part and lower part of the plastic housing in correct axial position. In particular, the adjusting element may comprise a wax thermostat for controlling the temperature of the intake air of a mixture-compressing internal combustion engine.
The core idea of the invention lies in the creation of a plastic housing comprising an upper part and a lower part, which is configured such that it is possible to weld the two parts together. It must be thereby be taken into account that the locations at which welding is carried out are able to accommodate sufficiently large axial position tolerances, that is, the connection points are provided with a tolerance range which permits welding within a certain allowable range of positions.
A further advantage of the invention is that the assembly of the plastic housing and the setting of the adjusting element are performed in a single operation, and result in an air-tight connection between the two parts.
In accordance with one advantageous embodiment of the invention, the welding of the two parts is performed by a spin-welding procedure. Of course, other welding methods are possible.
To facilitate simple preliminary assembly of the components, that is to say, of the adjusting element or wax thermostat with the upper part and lower part of the plastic housing, as well as possible other parts which may be disposed in the housing, the upper part and lower part have snap fasteners. Because of this snap fastening, it is possible to arrange the individual components in the housing and snap the housing together, and in this preassembled state to carry out a temperature adjustment of the wax thermostat. Then the adjustment welding, that is to say the welding, sealing and setting, is carried out in a single operation.
To accommodate the varying amounts of welding efflux at the location of the weld, in accordance with another embodiment of the invention, chambers are provided, one in front and the other behind the location of the weld. The weld efflux collects in these chambers, so that the formation of elements, such as a flashing or the like, which might interfere with functional operation is effectively prevented.
These and other features of preferred embodiments of the inventi

REFERENCES:
patent: 4142677 (1979-03-01), Ludwig
patent: 4175590 (1979-11-01), Grandclement
patent: 4175696 (1979-11-01), Braukmann
patent: 4628959 (1986-12-01), Parker et al.
patent: 4663206 (1987-05-01), Bouycoucos et al.
patent: 4919987 (1990-04-01), Manner
patent: 5286001 (1994-02-01), Rafeld
patent: 5551482 (1996-09-01), Dixon et al.

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