Hydraulic control valve system for a planet gear transmission pa

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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Details

74869, 74865, 74752C, 74868, B60K 4104, F16H 374

Patent

active

043477640

ABSTRACT:
A control valve system for a planetary transmission having planetary gear elements and clutch and brake means for controlling the relative motion of the gear elements, said clutch and brake means including a second speed ratio brake servo having a double acting piston with a brake apply side and brake release side, a fluid pump driven by the input elements of said transmission, a throttle pressure valve for developing a torque input signal, a source of a driven speed signal, control valves responsive to said signals for controlling distribution of pressure from said pump to said servos, and a servo regulator valve means for modulating the regulated pressure in said circuit in response to changes in said torque signal to develop a controlled pressure on the release side of said second speed ratio servo, whereby the rate of application of said second speed ratio servo is controlled upon application of pressure to the apply side thereof.

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