System for detecting and transmitting test data from a pressure chamber filled with a high-pressure fluid

1. A system for detecting and transmitting test data from a housing ( 10 ) comprising a pressure chamber ( 11 ) that is filled with a high-pressure fluid and is homogeneously pressurized via printed conductors ( 21 ) connected to a sensing element ( 23 ) situated in the pressure chamber ( 11 ) and are guided out of the housing ( 10 ), a circuit board ( 12 ), both faces of which being subjected to the pressure prevailing in the pressure chamber ( 11 ) and at least one portion ( 30 ) of which extending out of the housing ( 10 ), being situated inside the pressure chamber ( 11 ) as a support for the strip conductors ( 21 ) and the housing ( 10 ) that encloses the pressure chamber ( 11 ) being separated in the plane of the circuit board and the faces of the housing halves ( 13 , 14 ) clamping the circuit board ( 12 ) between them in such a way that radial forces exerted within the circuit board are absorbed when pressure is applied.

2. The system as recited in claim 1 , wherein the housing halves ( 13 , 14 ) hold the circuit board ( 12 ) by a frictional connection.

3. The system as recited in claim 1 , wherein the housing halves ( 13 , 14 ) hold the circuit board ( 12 ) by a positive connection.

4. The system as recited in claim 1 , wherein the circuit board ( 12 ) is made from a hard plastic.

5. The system as recited in claim 1 , wherein seals ( 18 ) are situated between faces ( 15 ) of the housing halves ( 13 , 14 ) which clamp the circuit board ( 12 ) and the surfaces of the circuit board ( 12 ).

6. The use of a system designed as recited in claim 1 for detecting the longitudinal movements of a valve piston movable in hydraulic valves.

7. The system as recited in claim 1 , wherein one housing half ( 14 ) encompasses opposite facing other housing half ( 13 ) externally via an axially projecting flange ( 16 ), an external edge area of the circuit board ( 12 ) being in contact with an inside of the flange ( 16 ).

8. The system as recited in claim 7 , wherein the flange ( 16 ) has a cutout ( 17 ) extending across a limited circumferential portion, which is penetrated by a projection ( 30 ) extending outwardly from the circuit board ( 12 ).

9. The system as recited in claim 1 , wherein at least one sensor that detects a change of length of the circuit board ( 12 ) is situated on the circuit board ( 12 ).

10. The system as recited in claim 9 , wherein the sensor is a strain gauge.

11. The system as recited in claim 9 , wherein a sensor recording a change of the material thickness of the circuit board ( 12 ) is situated in the circuit board ( 12 ).

12. The system as recited in claim 1 , wherein the circuit board ( 12 ) has a recess ( 19 ) used to equalize pressure between sub-chambers ( 11 a , 11 b ) of the pressure chamber ( 11 ) located on both sides of the circuit board.

13. The system as recited in claim 12 , wherein the circuit board is designed to accommodate a position measuring system and a position pickup coil ( 23 ) being situated in the recess ( 19 ) and connected to the printed conductors ( 21 ) located on the circuit board ( 12 ), the position pickup coil ( 23 ) lying in the fluid located in the pressure chamber ( 11 ) surrounding a position pickup core ( 25 ) which is axially movable through the recess ( 19 ) of the circuit board ( 12 ) and the position pickup coil ( 25 ).

14. The system as recited in claim 13 , wherein a wire winding ( 32 ) of the position pickup coil ( 23 ) which is located on a coil frame ( 31 ) is spray coated with a suitable material.

15. The system as recited in claim 14 , wherein the spray coating ( 35 ) of the wire winding ( 32 ) includes connections of the wire winding ( 32 ) to printed conductors ( 21 ) extending in the circuit board ( 12 ).

16. The system as recited in claim 14 , wherein the material of the spray coating ( 35 ) matches the material of the circuit board ( 12 ).