Servo-mechanism for use in a hydrostatic transmission

Details Servo-mechanism for use in a hydrostatic transmission Servo-mechanism for use in a hydrostatic transmission

1987-05-26

1988-01-26

Look, Edward K.

Power plants

Pressure fluid source and motor

Full range correspondence of position of external...

60443, 60445, 417218, F16D 3102

Patent

active

047209747

ABSTRACT:
A servo-mechanism includes a piston and cylinder unit controlled by a valve coupled in known manner by a linkage means to a movable control element to provide closed loop servo operation to position the piston and cylinder unit piston rod according to the position of the movable element. The movable element is fast with an annular gear segment of an epicyclic gear mechanism of which the sun gear forms a main control input and the planet pinion carrier forms an override input. The mechanism is of utility in an hydraulic transmission of the variable stroke pump/fixed stroke motor type, the overrride input being actuable by a pump port pressure limit sensor.

REFERENCES:
patent: 3103986 (1963-09-01), Barton et al.
patent: 3127745 (1964-04-01), Young
patent: 3168203 (1965-02-01), Gallistel
patent: 4013380 (1977-03-01), Pensa
patent: 4461147 (1984-07-01), Myers
patent: 4476680 (1984-10-01), Pollman et al.

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