Seoul, South Korea
Seoul, South Korea

Doosan Group is a South Korean conglomerate company. In 2009, the company was placed 471st in the Fortune Global 500. It has been included in the Forbes Global 2000 companies from 2007. It is the parent company of ŠKODA power. Doosan was ranked 4th among the “World’s Best 40 Companies 2009” list, released in the latest issue of BusinessWeek, the U.S. economics magazine in October 2009. Fortune Global 500 Wikipedia.


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Patent
Doosan Infracore | Date: 2016-08-23

A dust preventing seal may include a body and first and second dust lips. The body may be installed at a locking portion between an arm and a bucket of a construction machine. The body may have an annular shape. The first and second dust lips may be protruded from an outer surface of the body to the outside.


Patent
Doosan Infracore | Date: 2017-02-01

An engine may include a cylinder, an intake valve, a piston, an exhaust valve and a crankshaft. The cylinder may include a cylinder bore. The intake valve may be configured to introduce a fuel and an air into the cylinder bore. The piston may be slidably arranged in the cylinder bore. The piston may be configured to convert an explosive power of an exhaust gas, which may be generated by combusting the fuel, into a linear driving force. The exhaust valve may be configured to exhaust the exhaust gas from the cylinder bore. The crankshaft may be connected with the piston to convert the linear driving force into a rotary driving force. The intake valve and the exhaust valve may be simultaneously opened within a rotation angle of about 3 to about 12 of the crankshaft. Thus, the engine may have improved volumetric efficiency of the engine and fuel efficiency of the engine. Further, the engine may satisfy emission regulations with respect to a CH_(4) gas.


Patent
Doosan Infracore | Date: 2017-04-05

An engine control apparatus includes a temperature sensor configured to detect engine-related temperature information, a first calculator configured to calculate a first limit output value of an engine based on the temperature information inputted from the temperature sensor, an oil pressure sensor configured to detect a pressure of engine oil, a second calculator configured to calculate a second limit output value of the engine based on the oil pressure inputted from the oil pressure sensor, and a determiner configured to determine one of the first and second limit output values inputted from the first and second calculators as an optimal limit output value of the engine.


Heat resistant spheroidal graphite cast iron includes carbon (C) in a range of 3.2 - 3.4 wt%, silicon (Si) in a range of 4.3 - 4.8 wt%, manganese (Mn) in a range of 0.2 - 0.3 wt%, molybdenum (Mo) in a range of 0.8 - 1.0 wt%, vanadium (V) in a range of 0.4 - 0.6 wt%, chrome (Cr) in range of 0.2 - 0.4 wt%, niobium (Nb) in a range of 0.2 - 0.4 wt%, inevitable impurities, and a remainder of iron (Fe) based on a total weight of the heat resistant spheroidal graphite cast iron. The heat resistant spheroidal graphite cast iron further includes barium (Ba) in a range of 0.0045 - 0.0075 wt%. A content ratio of chrome (Cr) and barium (Ba) (Cr/Ba) is in a range from about 26 to about 89. The heat resistant spheroidal graphite cast iron may have an improved high temperature tensile strength.


The present disclosure relates to a method for controlling a swing motor in a hydraulic system and a hydraulic system. The method for controlling the swing motor in the hydraulic system and the hydraulic system according to the exemplary embodiment of the present disclosure may ensure the sufficient amount of hydraulic oil in a make-up line in a situation in which the hydraulic oil needs to be supplementarily supplied to the swing motor in the hydraulic system. Therefore, it is possible to prevent the occurrence of cavitation in the swing motor by stably supplying the amount of hydraulic oil at the point in time where the hydraulic oil needs to be supplementarily supplied to the swing motor. In addition, it is possible to prevent the occurrence of abnormal noise which is harsh to the ear when the cavitation occurs.


In a method of displaying a dead zone of a construction machine, actual images with respect to omnidirectional views of a cabin in the construction machine may be obtained. A virtual image with respect to the dead zone generated by a working tool, which may be connected to the cabin, may be obtained from the actual images. The virtual image may be displayed on a monitor in the cabin. Thus, a worker in the cabin may accurately acknowledge whether a man or a fixture may exist or not in a region in front of a rotation direction of a boom by seeing the virtual image. Thus, a negligent accident caused by the rotation of the boom may be prevented.


Patent
Doosan Infracore | Date: 2016-11-08

In a load weighing method for a wheel loader, an inclined angle of a ground surface on a slope where the wheel loader is working is detected. A change in a boom angle and a change in a pressure of a boom cylinder are detected while pivoting the boom and an attachment connected to the boom when a load is placed on the attachment. Weight of the load is calculated using the inclined angle of the ground surface, the change in the boom angle, and the change in the pressure of the boom cylinder as variables of a rotational dynamic equation for the pivot of the boom.


Patent
Doosan Infracore | Date: 2017-05-10

In a load weighing method for a wheel loader, an inclined angle of a ground surface on a slope where the wheel loader is working is detected. A change in a boom angle and a change in a pressure of a boom cylinder are detected while pivoting the boom and an attachment connected to the boom, wherein a load is placed on the attachment. Weight of the load is calculated using the inclined angle of the ground surface, the change in the boom angle and the change in the pressure of the boom cylinder as variables of a rotational dynamic equation for the pivot of the boom.


Patent
Doosan Infracore | Date: 2015-05-26

A wheel driving system includes a generator connected to an engine and configured to generate electrical energy, a front axle configured to drive a front wheel and including a front electric motor configured to produce a driving torque and a front transmission configured to convert the driving torque into a conversion torque and transmit the conversion torque to the front wheel via a front drive shaft, a rear axle configured to drive a rear wheel and including a rear electric motor configured to produce a driving torque and a rear transmission configured to convert the driving torque into a conversion torque and transmit the conversion torque to the rear wheel via a rear drive shaft, and a central connection unit operatively connected to the front drive shaft and the rear drive shaft and configured to transmit the conversion torque between the front axle and the rear axle.


Patent
Doosan Infracore | Date: 2015-05-26

A wheel driving system includes a generator connected to an engine and configured to generate electrical energy, a front axle configured to drive at least one front wheel and including a front electric motor configured to produce a driving torque from the electrical energy supplied from the generator and transmit the driving torque to the front wheel via a front drive shaft, a rear axle configured to drive at least one rear wheel and including a rear electric motor configured to produce a driving torque from the electrical energy supplied from the generator and transmit the driving torque to the rear wheel via a rear drive shaft, and a central connection unit operatively connected to the front drive shaft and the rear drive shaft and configured to transmit the driving torque between the front axle and the rear axle.

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