Fluid handling – Systems – With flow control means for branched passages
Reexamination Certificate
1999-09-13
2001-04-24
Fox, John (Department: 3753)
Fluid handling
Systems
With flow control means for branched passages
C251S129150
Reexamination Certificate
active
06220300
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a module, especially a module for an electrohydraulic hydraulic transmission controlling device.
2. Prior Art
This type of module has a multipart housing in which component groups, especially resistors and magnetic valves, are arranged. The module acts as an interface between the electronic control circuitry and the mechanism. It contains all required component groups and simplifies assembly at the transmission manufacturers, since only one part is to be assembled instead of the individual component groups.
The housing of the module comprises a cover and a control block. A plug is arranged on the cover, at which a controller can be connected. The connection to the component groups, i.e. the magnetic valves and resistors, occurs by a punched grid. The punched grid is either coated by injection molding and/or covered with the cover. The electrical contacting with the other parts takes place in a solder bath, which is an expensive process step. A principal disadvantage of the punched grid is that essentially is formed in only two-dimensions. The structural embodiments are limited in their geometrical form.
The control block is usually made in a conventional die casting process. The valve seat must subsequently be made subsequently in an additional turning or milling operation. The connections for the conductors leading to the magnetic valves are formed through passages, which extend transversely to the axes of the valve seats. Filter elements are built into these transverse passages. Several assembly axes result because of these structural features, which makes the assembly more difficult, since the various parts must be assembled from different directions in the control block. The valve component groups are usually expensive parts that must be manufactured by drilling, turning and milling. The attachment of the magnetic valves in the control block occurs by means of an additional clip, which is secured with screws in the control block.
In total, a commercial module requires many parts and many processing steps for manufacture and assembly.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a module, especially a module for an electrohydraulic hydraulic transmission controlling device of the above-described type which does not have the above-described disadvantages.
According to one feature of the invention a first housing part is made in a MID molding method (molded interconnect device), whereby it is possible to provide conductor strips, electrical connections and mechanical attachment devices for component parts and a plug for connection of a controller.
The module according to the invention has the advantage that it requires fewer parts and fewer working steps for manufacture and assembly of the parts.
According to another feature of the invention a second housing part is made in a thixotropic casting process, whereby the milling of the seat surfaces in the receptacles can be eliminated.
The assembly of the module is then essentially simplified and thus made more economical when the receptacles are formed in the housing parts so that the component groups can be assembled from only one or from two opposite sides of the housing part. Thus a uniaxial assembly results which is more economical in contrast to an assembly that occurs from several sides, when a locking strap is formed on a first housing part which engages in receptacles formed in the second housing part. In this way additional attaching devices such as screws can be eliminated.
An especially simple connected between the first housing part and the second housing part results when a locking clip is formed on the first housing part which engages in a receptacle or recess provided in the second housing part. In this way additional attaching elements such as screws can be eliminated.
It is particularly advantageous when the first housing part is formed as a cover and the second housing part as a control block.
If resistors are arranged in passages formed in the control block and have a resilient connector which has a conical outer surface in which a conical projection of the cover engages, the resistors are held fixed only by the assembled housing parts. Furthermore this provides some additional tolerance compensation.
Various embodiments for the assembly result when the magnetic valves comprises coil-art groups and valve-part groups. The coil-part groups are attached to the cover and the valve-part groups to the control block. It is particularly advantageous when the coil-part groups are attached to the cover by cut terminal connections. When the valve-part groups are fixed by a form-locking connection in a valve seat that is provided as a stepped passage in the control block, the edges of the passages are wedged about the pole pieces of the valve-part groups in a ring-like manner, which simplifies the assembly.
Additional parts may be dispensed with and the assembly simplified when a cylindrical depression is formed in the pole piece of the magnetic valve, in which a punched valve seat and punched and deep drawn valve cap are arranged. An especially strong hold and a good seal result when the valve seat and the valve cap are fixed by wedging or forcing in the pole piece.
Additional advantages and advantageous features of the module according to the invention are described further in the detailed description hereinbelow and the description.
REFERENCES:
patent: 5466055 (1995-11-01), Schmitt et al.
patent: 5474108 (1995-12-01), Inden et al.
patent: 5692813 (1997-12-01), Vellmer
patent: 196 01 202 A1 (1997-03-01), None
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patent: 197 08 210 A1 (1998-09-01), None
patent: 694 10 202 T2 (1998-09-01), None
patent: 692 26 397 T2 (1998-12-01), None
patent: 695 06 740 T2 (1999-05-01), None
Beakley Jim
Brownlee Jeff
Casari John
Schudt Klaus
Fox John
Robert & Bosch GmbH
Striker Michael J.
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