Patent application number | Description | Published |
20090193801 | HYDRAULIC DRIVE SYSTEM - A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store supplies energy. The drive system may be combined with other services including a transmission for incorporation in a vehicle. The transmission uses a pressure compensated supply and torque control of the wheels. | 08-06-2009 |
20100300279 | Point Of Use Actuator - A hydraulic actuator system designed to inwardly contain major portions of its control system. The system includes a unique non-vented and air tight sealed reservoir with expandable bladder. This inward control system and non-vented reservoir optimize space saving advantages and eliminate the need for external elements typically used in a hydraulic system, while extending fluid life, reducing cavitation and fluid oxidation, and increasing performance in the hydraulic system. The system configurations can work for both a single or dual acting linear actuator and further can involve a motor, hydraulic pump, and electro-hydraulic valve circuit used to control fluid throughout the system. | 12-02-2010 |
20110061375 | Hydraulic Drive System - A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store supplies energy. The drive system may be combined with other services including a transmission for incorporation in a vehicle. The transmission uses a pressure compensated supply and torque control of the wheels. | 03-17-2011 |
20110271829 | Rotary Hydraulic Machine and Controls - A variable capacity hydraulic machine has a rotating group located within a casing and a control housing secured to the casing to extend across and seal an opening in the casing. The control housing accommodates a control circuit and a pair of sensors to sense change in parameters associated with the rotating group. One of the sensors is positioned adjacent the barrel on the rotating group to sense rotational speed and the other senses displacement of the swashplate. The control housing accommodates a control valve and accumulator to supply fluid to the control valve. | 11-10-2011 |
20120198827 | Hydraulic Drive System - A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store supplies energy. The drive system may be combined with other services including a transmission for incorporation in a vehicle. The transmission uses a pressure compensated supply and torque control of the wheels. | 08-09-2012 |
20120260643 | VELOCITY CONTROL FOR HYDRAULIC CONTROL SYSTEM - A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator. The capacity of one of the machines is limited in a motoring mode to determine a maximum rate of efflux from one of the chambers. The pressure of fluid supplied to the other of said chambers is maintained at a predetermined level to provide motive force. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store surplus energy. | 10-18-2012 |
20120260644 | ENGINE AUGMENTATION OF HYDRAULIC CONTROL SYSTEM - A power distribution system includes a prime mover and a hydraulic drive system. The hydraulic drive system includes an accumulator to store energy and supplement that available from the prime mover. A control monitors torque imposed on the prime mover and utilises energy stored in the accumulator to offload the prime mover when its operating conditions are to be changed. Effecting a change under reduced load conditions mitigates inefficient operation of the prime mover. | 10-18-2012 |
20150330414 | VELOCITY CONTROL FOR HYDRAULIC CONTROL SYSTEM - A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator. The capacity of one of the machines is limited in a motoring mode to determine a maximum rate of efflux from one of the chambers. The pressure of fluid supplied to the other of said chambers is maintained at a predetermined level to provide motive force. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store surplus energy. | 11-19-2015 |