Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1986-09-03
1988-07-19
Tolin, G. P.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
200 83N, 2003021, 337320, 92103M, H01H 3534
Patent
active
047586958
ABSTRACT:
An automotive transmission control is shown having pressure switches to sense the state of actuation of solenoid valves to provide logic signals to a microprocessor type of transmission control. The pressure switches, which sense the pressure of hydraulic fluid used to actuate the solenoid valves, use a dished shaped metallic diaphragm characterized in that the pressure-deflection curve of the center of the diaphragm has minimal hysteresis and reflects that the diaphragm is relatively stiff having a positive coefficient of pressure with increasing deflection up to and above a range of set point pressures within which the effective spring rate of the diaphragm changes with the diaphragm being relatively supple but having little or no negative coefficient of pressure.
In a first embodiment a housing is shown in which a conductive lead pattern is molded in the housing with a plurality of switching stations. Each switching station has a circular diaphragm formed with an annular flat berm portion which lies on a portion of the conductive lead pattern and is sealed by an "O" ring biased against the berm by a sleeve which interfaces with the hydraulic fluid. An electrically conductive rivet is placed beneath the diaphragm within a specific distance from a plane on which the berm lies so that a circuit will be closed upon sufficient deflection of the diaphragm. The housing mounts electrical contacts for energizing the solenoid valves and a pin connector coupled to the conductive lead pattern.
Other embodiments are shown using diaphragms having the same pressure-deflection curve.
REFERENCES:
patent: 4211901 (1980-07-01), Matsuda
patent: 4220836 (1980-09-01), Hersey
patent: 4386247 (1983-05-01), Couat
patent: 4521651 (1985-06-01), Matsumoto
patent: 4591677 (1986-05-01), Hirota
Lombardo George J.
Marcoux Leo
Sanford Carlton E.
Strott Douglas B.
Haug John A.
McAndrews James P.
Sharp Melvin
Texas Instruments Incorporated
Tolin G. P.
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