Leak proof position sensor with permanent magnet shaft

Details Leak proof position sensor with permanent magnet shaft Leak proof position sensor with permanent magnet shaft

G - Physics

08

C

26/112, 340/137

G08C 21/00 (2006.01) G01D 11/24 (2006.01) G01D 11/26 (2006.01) F02B 3/06 (2006.01)

Patent

CA 1194180

Leak Proof Position Sensor With Magnetic Shaft Abstract A leak tight position sensor or transducer (10) comprising a housing (12) having a cavity (32) with an opening (14) in one side and an aperture (16, 26) in each end of the housing (12). Located within the cavity (32) is a drive block (34) having bushing (36) with a threaded aperture (37) receiving the threaded end (42) of a shaft (40) made of a permanent magnet material. The threaded end (42) of the magnetic shaft (40) has a flat (44) and the other end (46) of the shaft is journalled in an aperture (16) of the housing (12). A metallic contactor (38) attached to the drive block (34) wipably engages an electrical circuit (54) printed on the interior surface (52) of a ceramic substrate (50) proportioned to seal the housing opening (14). Electrical wires (60) inserted through openings (58) in the substrate (50) are soldered to the circuit (54) and not only complete electrical connection and securement of the wires (60) to the circuit (54), but seal the openings (58) in the ceramic substrate (50). The ceramic substrate (50) is joined to the housing by an adhesive (70) which provides a leak tight sealing of the perimeter of the ceramic substrate (50) to the housing opening (14). The trans- ducer (10) can be attached to a rotary diesel injection pump whereby fuel may enter into the interior of the housing (12) without leakage therefrom, and can be internally calibrated while attached to the pump.

423627

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