Motors: expansible chamber type – Constantly applied motive fluid with controlled venting – Fluid vented through working member
Patent
1978-03-20
1980-08-12
Maslousky, Paul E.
Motors: expansible chamber type
Constantly applied motive fluid with controlled venting
Fluid vented through working member
91 51, 91375R, 91376A, 91431, F15B 910
Patent
active
042167019
ABSTRACT:
A hydraulic servo-actuator has a casing embracing therein a hydraulic fluid chamber which is divided into two hydraulic drive chambers by a vane projecting from a first shaft. To each of the divided chambers are connected an oil feeding passage provided with a variable restrictor and intended for the feeding of pressurized oil and an oil discharge passage intended for the discharging of the pressurized oil. A second shaft is coaxially disposed relative to the first shaft, and the first and second shafts are correlated with each other in such a way that the relative rotary displacement occurring between the two shafts controls the aperture of the oil discharge passages communicating with the divided chambers. The difference between the static pressures which are consequently produced within the divided chambers because of the aperture of the oil discharge passages causes the vane to swing, making it possible to control the torque even when the vane is in the neighborhood of its neutral position. In addition, the variable restrictors provided in the oil feeding passages serve the purpose of regulating the amount of the pressurized oil to be fed. Hence, the hydraulic servo-actuator is capable of stably controlling the torque.
REFERENCES:
patent: 1876104 (1932-09-01), Tucker
patent: 2628684 (1953-02-01), Slatter et al.
patent: 3066653 (1962-12-01), Stiglic et al.
patent: 3354785 (1967-11-01), Sagawa
patent: 3499752 (1970-03-01), Vermigs
Agency of Industrial Science & Technology
Kelman Kurt
Maslousky Paul E.
Ministry of International Trade & Technology
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