초록 ▼

A feedback potentiometer type servoactuator having a plastic housing shell with small high RPM low voltage motor and non-metallic gear reduction train for driving an output shaft. The shell and cover plate provide structural support for gear journalling and the cover plate has an electrically resist

A feedback potentiometer type servoactuator having a plastic housing shell with small high RPM low voltage motor and non-metallic gear reduction train for driving an output shaft. The shell and cover plate provide structural support for gear journalling and the cover plate has an electrically resistive plastic strip baked onto the inside of the cover. Contacts mounted on the output gear for movement therewith wipe the resistive strip to provide variable resistance for an output shaft position feedback signal. The motor pinion and first stage reduction gears are made of urethane thermoplastic elastomer, the second stage gears of acetal plastic and the final gears are formed of 30% glass fiber filled polyester plastic for providing quiet running and long gear life.

대표청구항 ▼

A servoactuator having an output shaft rotated by a motor in response to an electrical signal, said servoactuator comprising: (a) housing means including a shell member and a cover therefor, with said motor mounted in said shell; (b) speed reducing means disposed in said shell and connecting said mo

A servoactuator having an output shaft rotated by a motor in response to an electrical signal, said servoactuator comprising: (a) housing means including a shell member and a cover therefor, with said motor mounted in said shell; (b) speed reducing means disposed in said shell and connecting said motor with said output shaft, said speed reducing means including, (i) a first stage cluster gear and motor pinion formed of relatively soft low modulus thermoplastic urethane elastomer; (ii) a second stage cluster gear driven by said first stage and formed of non-metallic material having a minimum hardness of 120 as measured on the Rockwell “R”scale; (iii) a third stage cluster gear driven by said second stage and formed of thermoplastic polyester material having about thirty percent (30%) glass fiber fill; (c) variable resistor means including a resistive strip formed integrally on the inner surface of said cover plate and wiper means moveable with said speed reducer means for wiping said resistor means, said resistor means comprising at least one arcuate strip of polymeric material admixed with a material of predetermined electrical resistivity; (d) electrical connector means connected to said resistor means and adapted for external electrical lead connection thereto, said connector means being series connected with said electrical contacts to provide a predetermined variable electrical resistance in said circuit with variable positions of said output shaft; and, (e) means securing said cover plate over said shell.