Measuring and testing – Fluid pressure gauge – Piston
Patent
1986-02-19
1987-06-23
Yasich, Daniel M.
Measuring and testing
Fluid pressure gauge
Piston
73707, G01L 716
Patent
active
046743359
ABSTRACT:
A low oil pressure sensor (32) is provided for direct mounting to a lubrication pump (4) for direct sensing of differential pump pressure. An internal sensor body portion (40) is exposed to the internal pump environment and has a magnetically permeable piston (48) axially slideable therein. High and low pressure aperture ports (56 and 50) through the internal sensor body sidewalls communicate respective high and low pressure sides of the pump to respective axial ends (58 and 54) of the piston. A radial gap (60) between the piston (48) and the interior sidewall (62) of the internal body portion provides a long narrow axial damping passage for damping high pressure pulses and transients from the high pressure side of the pump, to prevent false triggering. A magnetic coil (66) in the body detects piston movement according to changed flux linkage.
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Yasich Daniel M.
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