Abstract: A method for detecting a damaged-bearing in an engine using a vibration signal may include: separating, by a controller, a vibration signal of the engine detected by a vibration detecting device installed on one side of the engine of a vehicle into a vibration signal caused by combustion knocking and a vibration signal generated in a bearing, extracting a signal in a predetermined natural frequency band from the vibration signal generated in the bearing using a band-pass filter, and processing the extracted signal to a quantified bearing signal using the controller, and comparing the quantified bearing signal with a preset damaged-bearing criterion using the controller to determine whether the quantified bearing signal is equal to or higher than the preset damaged-bearing criterion to determine a damage to the bearing.

Abstract: A valve timing control apparatus of an internal combustion engine may include a driving rotational body to which torque is transmitted from a crankshaft, a driven rotational body fixed to a camshaft to which torque is transmitted from the driving rotational body, an electric motor disposed between the driving rotational body and the driven rotational body and relatively rotating the driving rotational body and the driven rotational body when electric power is applied thereto, and a deceleration mechanism that decelerates a rotational speed of the electric motor and transmits the decelerated rotational speed to the driven rotational body.

Abstract: A valve timing control apparatus of an internal combustion engine may include a driving rotational body to which torque is transmitted from a crankshaft, a driven rotational body fixed to a camshaft to which torque is transmitted from the driving rotational body, an electric motor disposed between the driving rotational body and the driven rotational body and relatively rotating the driving rotational body and the driven rotational body when electric power is applied thereto, and a deceleration mechanism that decelerates a rotational speed of the electrical motor and transmit the decelerated rotational speed to the driven rotational body.

Abstract: A balance shaft module having a variable capacity hydraulic pump may include a first balance shaft that receives torque from an engine and a first unbalance mass is formed, a second balance shaft that receives torque from the first balance shaft through a connection gear, and a hydraulic pump that suctions and discharges oil by the rotation of the second balance shaft and varies its capacity depending on oil pressure discharged.

Abstract: A variable valve lift apparatus may include a variable valve lift housing, a master piston which is slidably disposed in the variable valve lift housing and contacts a cam, a slave piston which is slidably disposed in the variable valve lift housing, defines an oil chamber with the master piston therebetween, and opens a valve connected to the slave piston according to reciprocative motion of the master piston, and a lift control portion which supplies oil to the oil chamber or exhausts oil in the oil chamber selectively to control a relative distance between the master piston and the slave piston.

Abstract: A cam target wheel for a vehicle may include a camshaft; and a lobe, formed on an outer circumferential surface of the camshaft, for recognizing a ridge and valley of a cam vibration waveform.

Abstract: An electro-hydraulic variable valve lift apparatus may include a housing, a master portion which is slidably disposed to the housing and contacts a cam, a first oil supply portion which supplies hydraulic pressure, a slave piston which is slidably disposed within the housing and defines an oil chamber with the master portion, a latching portion which is supplied the hydraulic pressure from the first oil supply portion and selectively connects the slave piston and the master portion, a second oil supply portion which selectively supplies hydraulic pressure to the oil chamber so as to control relative distances between the master portion and the slave piston when the slave piston is disengaged with the master portion, and a stepped portion formed to the housing between the master portion and the slave piston to elastically support the master portion.

Abstract: A cam target wheel for a vehicle may include a camshaft; and a lobe, formed on an outer circumferential surface of the camshaft, for recognizing a ridge and valley of a cam vibration waveform.

Abstract: An electro-hydraulic variable valve lift apparatus may include a valve unit housing of which a guide protrude portion is formed therein, a main piston which is slidably disposed in the valve unit housing and defines a valve adjusting oil chamber with the valve unit housing, a main spring which is disposed within the valve adjusting oil chamber and elastically supports the main piston on the guide protrude portion, a dependent piston which is slidably disposed within the valve unit housing, is guided along the guide protrude portion, reciprocates according to reciprocation of the main piston, and opens a valve, and a main oil supply portion which selectively supplies hydraulic pressure to the valve adjusting oil chamber.

Abstract: A variable compression ratio apparatus for varying a compression ratio, may include a connecting rod that is connected to a piston to take a combustion force; a pin link, one end of which is eccentrically connected to a crankshaft and the other end of which is pivotally connected to the connecting rod to form a connection portion therebetween; a slot link including a control slot to receive and guide the connection portion along the control slot; and a driving unit coupled to the slot link and configured to move the control slot to control a position of the connection portion.

Abstract: A variable compression ratio apparatus is disclosed. An upper connecting rod has one end rotatably connected to a piston so as to reciprocate motion of the piston. A lower connecting rod has one end rotatably connected to the other end of the upper connecting rod. A crankshaft is rotatably mounted at an eccentric position of the lower connecting rod. A control rod has one end rotatably connected to the other end of the lower connecting rod, to control the position of that end of the lower connecting rod. A control shaft is connected to the other end of the control rod, to control the position of that end of the control rod.

Abstract: A balance shaft function may be realized without employing a balance shaft, when an oil pump includes an inner rotor fixed to the rotation shaft and an outer rotor that rotates with the inner rotor if at least one rotor of the inner and outer rotors has a mass center formed apart from a rotation center.

Abstract: An electro-hydraulic variable valve lift apparatus may include a valve unit housing of which a guide protrude portion is formed therein, a main piston which is slidably disposed in the valve unit housing and defines a valve adjusting oil chamber with the valve unit housing, a main spring which is disposed within the valve adjusting oil chamber and elastically supports the main piston on the guide protrude portion, a dependent piston which is slidably disposed within the valve unit housing, is guided along the guide protrude portion, reciprocates according to reciprocation of the main piston, and opens a valve, and a main oil supply portion which selectively supplies hydraulic pressure to the valve adjusting oil chamber.

Abstract: An electro-hydraulic variable valve lift apparatus may include a housing, a master portion which is slidably disposed to the housing and contacts a cam, a first oil supply portion which supplies hydraulic pressure, a slave piston which is slidably disposed within the housing and defines an oil chamber with the master portion, a latching portion which is supplied the hydraulic pressure from the first oil supply portion and selectively connects the slave piston and the master portion, a second oil supply portion which selectively supplies hydraulic pressure to the oil chamber so as to control relative distances between the master portion and the slave piston when the slave piston is disengaged with the master portion, and a stepped portion formed to the housing between the master portion and the slave piston to elastically support the master portion.

Abstract: A variable valve lift apparatus may include a variable valve lift housing, a master piston which is slidably disposed in the variable valve lift housing and contacts a cam, a slave piston which is slidably disposed in the variable valve lift housing, defines an oil chamber with the master piston therebetween, and opens a valve connected to the slave piston according to reciprocative motion of the master piston, and a lift control portion which supplies oil to the oil chamber or exhausts oil in the oil chamber selectively to control a relative distance between the master piston and the slave piston.

Abstract: A balance shaft module according to the present invention includes a first balance shaft equipped with a first eccentric balance weight, a second balance shaft equipped with a second eccentric balance weight, and a hydraulic pump that is operated by the first balance shaft and the second balance shaft, wherein the hydraulic pump includes a first gear equipped on the first balance shaft and a second gear equipped on the second balance shaft and externally meshed with the first gear.

Abstract: A variable compression ratio apparatus for varying a compression ratio, may include a connecting rod that is connected to a piston to take a combustion force; a pin link, one end of which is eccentrically connected to a crankshaft and the other end of which is pivotally connected to the connecting rod to form a connection portion therebetween; a slot link including a control slot to receive and guide the connection portion along the control slot; and a driving unit coupled to the slot link and configured to move the control slot to control a position of the connection portion.

Abstract: A variable compression ratio apparatus is disclosed. An upper connecting rod has one end rotatably connected to a piston so as to reciprocate motion of the piston. A lower connecting rod has one end rotatably connected to the other end of the upper connecting rod. A crankshaft is rotatably mounted at an eccentric position of the lower connecting rod. A control rod has one end rotatably connected to the other end of the lower connecting rod, to control the position of that end of the lower connecting rod. A control shaft is connected to the other end of the control rod, to control the position of that end of the control rod.

Abstract: A balance shaft function may be realized without employing a balance shaft, when an oil pump includes an inner rotor fixed to the rotation shaft and an outer rotor that rotates with the inner rotor if at least one rotor of the inner and outer rotors has a mass center formed apart from a rotation center.

Abstract: A balance shaft module according to the present invention includes a first balance shaft equipped with a first eccentric balance weight, a second balance shaft equipped with a second eccentric balance weight, and a hydraulic pump that is operated by the first balance shaft and the second balance shaft, wherein the hydraulic pump includes a first gear equipped on the first balance shaft and a second gear equipped on the second balance shaft and externally meshed with the first gear.