Title: Acceleration and/or deceleration control system for mechanical power drives

Abstract: A system for controlling the acceleration and/or deceleration of a mechanical power drive having a rotatable power output element and a rotatable reaction element with a hydraulic or pneumatic brake mechanism connected thereto, in which a motor drive pump or other pressure creating device is connected by a fluid pressure line to the brake mechanism, and a bleed line with an electrically controlled valve therein is connected to the fluid pressure line for relieving the pressure delivered by the pump to the brake mechanism. An electrical system responsive to the rotational speed of the output element of the power drive controls the pressure creating means to control the acceleration and/or deceleration rate of the output element. An accumulator and a pressure responsive relief valve are preferably included in the system to assist in regulating the pressure delivered to the brake mechanism, and a dump valve and overload control device are normally included in the system.

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Inventors: Woyton, Joseph T. (South Bend, IN, US)
Meredith, Richard L. (Mishawaka, IN, US)

Application Number: 866286
Filing Date: 1978-01-03
Publication_date: 1979-09-25
Assignee: Reliance Electric Company (Mishawaka, IN)
Primary Class(es): 60/413 60/494, 60/911, 198/502.4, 198/832.2, 475/120
Other Classes:
US Patent Ref:

3724720	Apr, 1973	Bullivant	198/855.
4047452	Sep, 1977	Eddy	74/52C.

Other Refs:
Primary Examiner: Geoghegan, Edgar W.
Assistant Examiner:
Attorney: Hobbs; M. A.