Abstract: The present invention relates to a multi-component host material and an organic electroluminescent device comprising the same. By comprising a specific combination of the multi-component host compounds, the organic electroluminescent device according to the present invention can provide high luminous efficiency and excellent lifespan characteristics.

Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.

Abstract: The present disclosure relates to an organic electroluminescent compound represented by formula 1 and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound of the present disclosure, it is possible to provide an organic electroluminescent device having lower operating voltage, higher luminous efficiency and/or longer lifespan properties as compared with a conventional organic electroluminescent device.

Abstract: A nut screw conveying device includes a nut and a screw to convert rotational movement into translational movement. In the nut screw conveying device, a plurality of different threads is spirally formed on an inner circumferential surface of the nut, and the screw is provided with a plurality of rotating media to be respectively engaged with the different threads.

Abstract: The present invention relates to a pump structure of an electric integrated hydraulic brake device, and more particularly, to a pump structure of an electric integrated hydraulic brake device, which is applied to an inside of a motor having a hollow. The pump structure of an electric integrated hydraulic brake device includes a motor (100) provided with a hollow, a ball screw (120) provided inside the hollow and connected and rotated with a rotor of the motor (100), a ball nut (130) provided inside the hollow, connected with the ball screw (120), and moved in a reciprocal direction according to a rotational direction of the ball screw (120), a guide (140) provided inside the hollow, provided at one end portion of the ball nut (130) and configured to press an adjacent piston (180), and a supporter (150) formed in one end portion of the ball screw (120) to rotate together with the ball screw (120), and provided opposite the other end portion of the ball nut (130).

Abstract: An electric integrated brake device according to an embodiment of the present invention includes a master cylinder that generates a hydraulic pressure based on the operation of a pedal, a pedal simulator that provides a pedal stepping force to the pedal based on the hydraulic pressure, a motor that is driven based on the displacement of the pedal, a pump that applies a braking pressure to a wheel cylinder arranged at a wheel side of the vehicle based on the operation of the motor, a valve block that includes a plurality of solenoid valves for opening and closing the flow of oil moving among the master cylinder, the pedal simulator, the pump, and the wheel cylinder, and an ECU (electronic control unit) that controls the motor and the valve block, wherein the master cylinder, the pedal simulator, the motor, the pump, the valve block, and the ECU are integrated into a single structure.

Abstract: Disclosed is a variable pedal feeling adjustment device. A pedal simulator includes a simulator block formed with an oil hole connected to a master cylinder through a passage and a bore communicating with the oil hole, a damping housing slidably installed in the bore while being restricted in rotation, a first reaction unit provided in the bore and configured to provide reaction force by being pressurized by oil from the master cylinder, and a second reaction unit supported by the damping housing and configured to provide reaction force by being pressurized by the first reaction unit. An auxiliary simulator includes an auxiliary chamber connected to the passage through a connection passage, an auxiliary piston slidably provided in the auxiliary chamber, and an auxiliary spring to elastically support the auxiliary piston. A control valve is installed to the connection passage to control transfer of hydraulic pressure to the auxiliary chamber.

Abstract: Disclosed herein is a nut screw conveying device including a nut and a screw to convert rotational movement into translational movement. In the nut screw conveying device, a plurality of different threads is spirally formed on an inner circumferential surface of the nut, and the screw is provided with a plurality of rotating media to be respectively engaged with the different threads.