| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 060403000 | Apparatus having means responsive to or ameliorating the effects of breakage, plugging, mechanical failure or power failure | 9 |
| 20100077744 | BREATHER APPARATUS ON ELECTROMECHANICAL ACTUATORS FOR AIRCRAFT LANDING GEAR SYSTEMS - An actuator system and a method for assembling the same are provided. An actuator system includes a housing and a cap. The housing includes a cavity defined by the housing and an opening defined in a wall of the housing. The housing encases an actuator within the cavity. The cap is coupled to the housing to facilitate shielding the opening from a surrounding environment. | 04-01-2010 |
| 20100115937 | Method and Apparatus for Automatic Pump Shutoff - A method of detecting a fluid leak in a hydraulic fluid circuit includes preventing fluid from entering the circuit when an actual outlet flow rate from a pump is positive while a requested outlet flow rate to a hydraulic machine is zero. An outlet port of a variable displacement port can be selectively blocked, while in a fixed displacement pump (FDP) fluid can be diverted from the outlet port to a secondary fluid circuit. The actual outlet flow rate can be measured using a flow sensor or a swash plate angle depending on the pump design. A hydraulic fluid circuit includes a hydraulic machine, a pump, a valve at an outlet port of the pump, and a controller. The controller determines the requested flow rate, and actuates the valve to prevent fluid from entering the circuit whenever the actual outlet flow rate is positive during zero requested flow rate. | 05-13-2010 |
| 20100251705 | CONTROL OF A FLUID CIRCUIT USING AN ESTIMATED SENSOR VALUE - A fluid circuit includes a tank for holding fluid, a hydraulic device having a predetermined load configuration, and a pump for delivering the fluid under pressure to the hydraulic device. Sensors measure at least one of a supply pressure, a tank pressure, and a position of a portion of the hydraulic device. A controller estimates or reconstructs an output value of any one sensor using the predetermined load configuration in the event of a predetermined failure of that sensor, ensuring continued operation of the hydraulic device. A method for estimating the output value includes sensing output values using the sensors, processing the output values using the controller to determine the presence of a failed sensor, and calculating an estimated output value of the failed sensor using the predetermined load configuration. Operation of the hydraulic device is maintained using the estimated output value until the failed sensor can be repaired. | 10-07-2010 |
| 20110088383 | HYDRAULIC SYSTEM FOR AIRCRAFT - A hydraulic system for aircraft wherein at least one circuit includes two hydraulic pumps, at least one of which is driven by an engine that may suffer uncontained failure that can damage hydraulic lines close to the pump, is equipped with pressure sensors for the hydraulic fluid in the lines close to the pump and a sensor for the hydraulic fluid level in a hydraulic tank of the circuit supplied by the pump. A control system for a cut-out valve installed on a suction line wherein the fluid arrives at the pump includes logic that determines the occurrence of an uncontained engine failure requiring the isolation of the pumps from line elements that may have been damaged from measurements of the fluid pressures in the lines, from measurement of the level of fluid in the tank and from information supplied late by a uncontained engine failure detection system to command the closure of the cut-out valve. The disclosed embodiments allow achieving a simplified hydraulic architecture wherein two independent circuits are supplied by two pumps each mounted on propulsion engines. | 04-21-2011 |
| 20110146256 | CONTROL ARRANGEMENT FOR A VALVE-CONTROLLED HYDROSTATIC DISPLACEMENT UNIT - A control arrangement for a valve-controlled hydrostatic displacement contains a control unit for controlling the valve-controlled hydrostatic displacement machine, a sensor electronics portion for detecting sensor data of a power electronics portion and of the valve-controlled hydrostatic displacement machine, and the power electronics portion for furnishing a current necessary for operating the valve-controlled hydrostatic displacement machine. The control unit, the sensor electronics portion, and the power electronics portion are connected, as are the sensor electronics portion, the power electronics portion, and the valve-controlled hydrostatic displacement machine, which in turn are each connected to one another via bidirectional communications lines. The functionalities of the control unit, the sensor electronics portion, the power electronics portion, and the valve-controlled hydrostatic displacement machine are assigned, separately from one another, to these units and portions, and data and information are capable of being exchanged between these units and portions. The control unit is arranged for detecting information from the sensor electronics portion, the power electronics portion, and/or the valve-controlled hydrostatic displacement machine, centrally in only the control unit, and reacting to information which represents a changed situation and, in an interacting fashion, adapting the sequence control for the valve-controlled hydrostatic displacement machine. | 06-23-2011 |
| 20150377264 | HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY - A hydraulic system for construction machinery is capable of suppressing irregularity in the operation of the front structure not intended by the operator, and includes a regeneration motor adapted to be driven by return fluid from a bottom port of a boom cylinder; a regeneration electric motor converting rotary power into electric energy; return fluid control valves controlling the flow of the return fluid according to a pilot pressure related to an operation of a boom control lever; and a malfunction prevention device adapted to be activated by pressure fluctuation caused by malfunction of a solenoid valve for the return fluid control valve that interrupts the delivery of a pilot secondary pressure from the solenoid valve to the corresponding return fluid control valve. | 12-31-2015 |
| 060405000 | Second motive fluid supply means takes load responsive to failure of first | 1 |
| 20120131912 | AIRCRAFT ACTUATOR HYDRAULIC SYSTEM - A first actuator drives a control surface by being operated by supply of pressure oil from a first aircraft central hydraulic power source including a first aircraft central hydraulic pump. A second actuator drives the control surface by being operated by supply of pressure oil from a second aircraft central hydraulic power source including a second aircraft central hydraulic pump. A backup hydraulic pump is installed inside a wing of the aircraft and is provided so as to be able to supply pressure oil to the first actuator when a loss or degradation in a function of at least one of the first aircraft central hydraulic power source and the second aircraft central hydraulic power source occurs. A maximum discharge pressure of the backup hydraulic pump is set to be greater than maximum discharge pressures of the first aircraft central hydraulic pump and the second aircraft central hydraulic pump. | 05-31-2012 |
| 060406000 | Output means locked, positioned or released on failure of motive fluid supply means | 2 |
| 20080229738 | Hydraulic circuit to prevent bucket separation from bucket rest during traveling of heavy equipment - A hydraulic circuit is provided, which can prevent the bucket from being separated from the bucket rest by preventing a change of stroke of a boom cylinder or an arm cylinder during long traveling of wheel type heavy equipment, and can secure safety since it is not required for an operator to adjust the position of a working device like boom and arm. The hydraulic circuit includes first and second hydraulic pumps, a boom cylinder, an arm cylinder, a boom confluence logic valve, a first port formed to connect with a large chamber of the boom cylinder in a housing in which a spool for the boom cylinder is shiftably installed, a second port formed to connect with a hydraulic tank in the housing, and a first orifice formed between the housing and a land part of the spool for the boom cylinder located between the first port and the second port. During long traveling of the heavy equipment, a very small amount of hydraulic fluid fed from the second hydraulic pump to the large chamber of the boom cylinder drains to the hydraulic tank through the first orifice to prevent a change of stroke of the boom cylinder. | 09-25-2008 |
| 20100300084 | Hydrostatic Pump - A hydrostatic pump ( | 12-02-2010 |
