| DOOSAN INFRACORE CO., LTD. Patent applications |
| Patent application number | Title | Published |
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| 20120090309 | Swing Control Apparatus and Swing Control Method for Construction Machinery - Disclosed is a swing control apparatus of construction machinery, including: a hydraulic pump discharging working oil for driving a swing motor and controlling a discharge flux according to an input pump command value Vpump; a pressure sensor sensing pressure of the working oil discharged from the hydraulic pump; and a control unit calculating the pump command value Vpump based on a swing operation quantity Vsw input from the swing operation unit to output the calculated pump command value to the hydraulic pump, wherein when the input swing operation quantity Vsw is larger than a preset reference swing operation quantity Vswo and the discharge pressure Ppump of the hydraulic pump detected by the pressure sensor is lower than a first reference pressure Pswr | 04-19-2012 |
| 20120057989 | COOLING DEVICE FOR CONSTRUCTION MACHINERY - A cooling device of a construction machine according to the present invention includes: two or more hydraulic motors that rotate positively and reversibly to correspond to a supplying direction of pressure oil and drives rotatably cooling fans connected thereto, respectively; a switching valve switching rotation directions of the two or more hydraulic motors by switching the supplying direction of the pressure oil supplied to the two or more hydraulic motors from the hydraulic motor; and flow rate makeup valves controlling an additional flow supplied upstream of the two or more hydraulic motors when a pressure drop is generated upstream of the two or more hydraulic motors on the basis of the supplying direction of the pressure oil. | 03-08-2012 |
| 20110320015 | Construction Equipment Remote Control System and Method for Controlling Data Transmission/Reception While the Construction Equipment is in Engine-Off State - The present disclosure relates to a system and a method of remote management of a construction equipment for controlling transmission and reception of data of the construction equipment in a a key-off state. To this end, a system of remote management of a construction equipment according to the present disclosure includes a server communicatable with a communication terminal through a communication network; and a construction equipment where the communication terminal, a equipment control unit, and a plurality of electronic control devices are installed, wherein the communication terminal, the equipment control unit, and the electronic control devices are supplied standby power from a battery provided in the construction equipment, when the equipment control unit receives a key-off signal, the equipment control unit transfers a sleep mode switching command to the communication terminal and the electronic control devices of which operation modes are switched to a sleep mode, when the communication terminal wakes up from the sleep mode state at the time of receiving an operation request from the server and thereafter, wakes up the equipment control unit and transfers the requested operation of the server, and the equipment control unit performs the operation singly when performing the operation singly and thereafter, switches over to the sleep mode when completing the operation, and when the operation is associated with at least one of the electronic control devices, the equipment control unit performs the operation by waking up the corresponding electronic control device and switches the waked up electronic control device to the sleep mode when completing the operation. | 12-29-2011 |
| 20110264338 | EMERGENCY ENGINE RPM CONTROL APPARATUS FOR HEAVY CONSTRUCTION EQUIPMENT - The present disclosure relates to an apparatus for contingency controlling an engine rotational speed of a heavy construction equipment, which is capable of contingency controlling the speed of an engine when a controller of the heavy construction equipment such as an excavator does not operate normally. The apparatus for contingency controlling an engine rotational speed including a machine control unit generating a driving signal to control an operation of the engine by transferring a control value received from a control dial to an engine control unit may include: an instrument panel electrically connected with the engine control unit and allowing an operator to select and control a desired engine rotational speed because a control algorithm for the engine rotational speed is made into a database; and a connection switch electrically connecting the instrument panel and the engine control unit when the control dial or the machine control unit does not operate normally. | 10-27-2011 |
| 20110262287 | HYDRAULIC PUMP CONTROLLER FOR CONSTRUCTION MACHINE - A hydraulic pump controlling apparatus of a construction machine according to the present disclosure includes: a hydraulic pump in which a swash plate angle is controlled to control a discharge flow; an auxiliary pump; a control valve controlling a flowing direction of a fluid discharged from the hydraulic pump and selectively supplying the fluid to an actuator; an orifice and a relief valve connected between a center bypass line of the control valve and a tank T to be parallel to each other; signal pressure selecting units receiving a fluid passing through the center bypass line of the control valve and a fluid discharged from the auxiliary pump, and selecting the pressure of any one of the fluids as a signal pressure; and a regulator receiving the signal pressure selected from the signal pressure selecting units to control the swash plate angle of the hydraulic pump, and the signal pressure selecting unit selects the pressure of the fluid discharged from the auxiliary pump as the signal pressure and transfers the selected pressure to the regulator when the construction machine is in an idle state. | 10-27-2011 |
| 20110258293 | Method of Setting a Transmission Cycle for Information on Construction Equipment - The present disclosure relates to a method for setting a remote transmission cycle of information of a construction machinery for enabling a user or a provider to directly set the transmission cycle of the information of the construction machinery. To this end, the present disclosure enables the user or provider to set the transmission cycle for each information data packet. Further, the present disclosure previously determines various modes (e.g., a minimum charge mode, a medium charge mode, and a maximum charge mode) in which cycles of information data packets are set for each charge and enables the user or provider to set the transmission cycle by selecting the mode. Therefore, the user or provider can directly set the cycle for each packet or select the charge mode in accordance with a content of desired information and a desired communication cost condition. | 10-20-2011 |
| 20110257831 | Construction Equipment Information-Management System and Method Using a Communications - The present disclosure relates to a system and a method for information management of a construction machinery using a communication terminal mounted on the construction machinery. To this end, the information management system of the construction machinery of the present disclosure includes: a control server managing information of the construction machinery; a memory unit storing driving information of the construction machinery when the construction machinery is in a starting off state; and a communication terminal reading the corresponding information from the memory unit and transmitting the information to the control server when receiving a request for predetermined information from the control server. | 10-20-2011 |
| 20110257816 | REMOTE CONTROL SYSTEM AND METHOD FOR CONSTRUCTION EQUIPMENT - The present disclosure relates to a remote control system and a remote control method of a construction machine for reducing a fatigue degree of an operator at the time when the operator controls driving of the construction machine depending on his/her body motion in the remote control system of the construction machine. For this, according to the present disclosure, a value acquired by compensating for a predetermined value ε | 10-20-2011 |
| 20110253873 | Seat Base Sliding Apparatus - The present disclosure discloses a seat base sliding device applied to a seat of a heavy machinery such as a loader, an excavator, or the like. The seat base sliding device includes: a seat base with a lower part is fixed to a floor of a vehicle body and an upper part at which a seat is installed; a sliding plate slidable inwards and outwards in a lateral direction of the seat base at both left and right sides of the seat base and in which a control stand is fixed to one side thereof; and at least one adjustment unit selectively fixing the sliding plate of which the position is determined by sliding movement to the seat base. The present disclosure is capable of preventing a cabin from knocking against both control stands of a seat device at the time of assembling the cabin around the seat device and in addition, preventing the corresponding control stands from interfering in a thigh of a driver at the time of operating a control lever of each control stand laterally after assembling the cabin. | 10-20-2011 |
| 20110249923 | SINTERED BUSH - Provided is a sintered bush including a porous metallic sintered body including: a iron (Fe) based matrix containing a martensite structure; and one or more kind of metal matrix selected from copper (Cu), tin (Sn), and nickel (Ni), in which a lubricant which has oil separation of 5 to 10% at an operational temperature of 60 to 80° C. and is semisolid or solid at room temperature is impregnated in pores of the porous sintered body. | 10-13-2011 |
| 20110247441 | SPINDLE DRIVE - The present invention relates to a spindle drive. | 10-13-2011 |
| 20110243484 | Sliding Bearing With Improved Wear Resistance and Method of Manufacturing Same - The present invention relates to a sliding bearing with improved wear resistance which is manufactured in a sintered body type, and more particularly, to a bush type of sliding bearing that has excellent friction and wear characteristics with a shaft usually made of an iron-based material even under very poor sliding conditions of high-surface pressure, low speed, and irregularity, such that the lubrication cycle of may be extended, and also has excellent hardness such that load feed capability, plastic deformation suppression, and fatigue strength can be improved. | 10-06-2011 |
| 20110241904 | Communication Method for Monitoring Location of Construction Equipment - The present disclosure relates to a communication method for monitoring the position of a construction machine. The communication method according to the present disclosure includes: generating positional information of the construction machine and at least one piece of state information and at least one piece of operation information associated with the construction machine in the construction machine; and transmitting the generated information to a remote management unit which is positioned in a remote area from the construction machine by using a communication means, wherein the remote management unit partitions an area where the construction machine is movable and previously determines the amount and transmission cycle of information to be transmitted from the construction machine in accordance with the partitioned area, and the amount of information to be transmitted other than the positional information from the construction machine is reduced as the construction machine is distant out of a boundary line of the movable area, on the basis of the positional information received from the construction machine. According to the present disclosure, by controlling the amount and communication cycle of information to be transmitted according to a distance between the boundary line of the movable area and the construction machine, the more accurate positional information can be provided in a theft danger state or a theft state while keeping power consumption. | 10-06-2011 |
| 20110240147 | Fluid Flow Control Apparatus for Hydraulic Pump of Construction Machine - An apparatus for controlling the flow of a hydraulic pump of a construction machine according to the present disclosure includes: a pressure sensor detecting pressure signals corresponding to various control signal input values of the construction machine; a shuttle block including a plurality of shuttle valves dividing hydraulic lines connected with the pressure sensor into groups and extracting pressure oil of a hydraulic line under the highest pressure among hydraulic lines included in the corresponding group; auxiliary pressure sensors detecting the pressure of the pressure oil discharged from the shuttle block; electro proportional control valves in which opening rates are adjusted according to an applied signal and flows applied to signal lines are controlled to adjust discharge flows of main pumps; and a controller controlling the electro proportional control valves so that the opening rates of the electro proportional control valves are adjusted according to the magnitude of the pressure signal at the time of applying the pressure signal from the pressure sensor, wherein when the pressure sensor is judged as abnormal, the controller controls the operate rates of the electro proportional control valves to an opening rate corresponding to the magnitude of a signal outputted from the auxiliary pressure sensors. | 10-06-2011 |
| 20110235955 | SLIDING BEARING AND SLIDING BEARING ASSEMBLY - The present invention relates to a sliding bearing including a lubricating oil storing unit storing lubricating oil on the surface thereof and the sliding bearing of the present invention is provided so that the volume of the lubricating oil storing unit occupies 5 to 30 volume % of the entire volume of the sliding bearing. | 09-29-2011 |
| 20110220231 | BOOM CYLINDER CONTROL CIRCUIT FOR CONSTRUCTION MACHINE - The present disclosure includes a boom cylinder control circuit for a construction machine that includes a boom cylinder having an ascending-side chamber and a descending-side chamber. The boom cylinder control circuit for a construction machine includes: a first floating chamber that has first and second input ports connected to the descending-side chamber and the ascending-side chamber of the boom cylinder, respectively, at one side, and a first output port and a second output port connected with the drain tank, at the other side, and is switched to selectively connect the first and second input ports to the first and second output ports in accordance with an operational signal of the floating selection operation part; and a second floating valve of which one side is connected to the first output port of the first floating valve and the other side is connected to the drain tank to selectively connect the first output port with the drain tank in accordance with the operational signal of the floating selection operation part. | 09-15-2011 |
| 20110218087 | TOOL GRIPPER CHAIN BENDABLE IN TWO DIRECTIONS - The present disclosure relates to a tool gripper chain bendable in two directions that has a chain assembly that includes: gripper blocks that each have a first tooth at the center of a curved groove; first and second gripper assemblies that have first and second gripper members rotatably mounted on the rear of gripper blocks and grip a tool; first and second outer links that are formed in an arc shape; first and second inner links that are formed in an arc shape and disposed zigzag with respect to first and second outer links between first outer link and second outer link; and first and second collars that are disposed between first inner link and second inner link, in which first gripper assembly is disposed in front of second outer link, second gripper assembly is disposed ahead of second inner ink, and a first shaft hole of first gripper assembly and second shaft hole of second gripper assembly are coaxially arranged, such that first and second gripper assemblies are coupled by a first shaft or a second shaft. | 09-08-2011 |
| 20110197699 | STEERING SYSTEM FOR FORKLIFT - The present disclosure relates to a traveling control system for a forklift, and more particularly, to a traveling control system for a forklift that is additionally equipped with a forward/backward lever in a forklift equipped with a mono-pedal and improves operational convenience and work efficiency by selecting the mono-pedal and the forward/backward lever in accordance with the operational environment, and makes it possible to rapidly and conveniently perform inching of the forklift, by improving the structure of the mono-pedal to be rapidly operated without unnecessary operations. | 08-18-2011 |
| 20110192359 | PISTON COOLING APPARATUS - The present invention relates to a piston cooling device for cooling a piston. The piston cooling device according to an exemplary embodiment of the present invention includes: a cooling channel that is formed in a piston such that cooling fluid flows, and communicates with an intake port through which cooling fluid flows inside from the outside at a point and with an exhaust port through which the cooling fluid is discharged outside at another point; and a flow guide part that is formed in the cooling channel and guides the cooling fluid, which flows in the cooling channel through the intake port when the piston moves up or down, to flow to the exhaust port through the cooling channel. | 08-11-2011 |
| 20100276959 | CABIN MOUNTING STRUCTURE FOR CONSTRUCTION MACHINERY - A cabin mounting structure is applied to construction machinery in which a cabin for riding a driver is mounted on a vehicle body, the cabin mounting structure including: an up and down directional vibration damping unit for damping up and down directional vibration of the cabin, the up and down directional vibration damping unit being mounted between the cabin and the vehicle body; and a front and rear directional vibration damping unit for damping front and rear directional vibration of the cabin, the front and rear directional vibration damping unit 3 being mounted between the cabin and the vehicle body, wherein the cabin is connected to the vehicle body to be relatively movable in a front and rear direction. | 11-04-2010 |
| 20100274428 | MOTOR CONTROL METHOD AND CONTROL DEVICE FOR ELECTRICAL FORKLIFT TRUCK - A method for controlling a motor of an electrical forklift truck which includes at least one motor for traveling of the forklift truck or providing power to a pump that supplies power for operating a vehicle or oil to operational devices, a power module for controlling the power supply to the motors, and a control unit for controlling the power module and the motor, the method including the steps of: controlling to decelerate operating speed of the motor to be predetermined first decelerated speed by the control unit if a temperature of the motor and/or the power module increases and reaches a predetermined first level temperature value corresponding to the operating speed of the motor; and controlling to decelerate the operating speed of the motor to be predetermined second decelerated speed that is lower than the first decelerated speed by the control unit if the temperature of the motor and/or the power module increases in a state of the speed of the motor having been decelerated and reaches predetermined second-level temperature value that is higher than the first level temperature value and corresponds to the first decelerated speed. In this respect, the shutdown of the motor is postponed as long as possible so as to expend the operating time of the electrical forklift truck. Further, the shutdown of the motor can be postponed even without mounting the separate cooling apparatus, such as the cooling fan, so as to reduce the manufacturing cost. | 10-28-2010 |
| 20090274403 | Bearing Having Improved Consume Resistivity and Manufacturing Method Thereof - Disclosed is a composition for a bush-type bearing, a bush-type bearing manufactured using the composition, and a method of manufacturing the bush-type bearing. The bearing has excellent friction characteristics with a shaft made of iron (Fe) based material, and thus is able to increase the lubrication cycle of a lubricant. Further, the bearing has excellent hardness, and thus is able to prevent plastic deformation under high contact pressure. | 11-05-2009 |
