Abstract: The present invention discloses a power transmission apparatus. The power transmission apparatus includes: an input shaft including a male screw portion formed thereon; a pair of input gears formed on the input shaft to be freely rotatable with the male screw portion being interposed therebetween; an output gear formed to be rotatable in a state of being linked with the pair of input gears; and a power interrupting unit screw-coupled to the male screw portion of the input shaft, and configured to rectilinearly reciprocate along the input shaft by a rotation of the input shaft to be selectively engaged with any one of the pair of input gears so as to transmit a power.

Abstract: The present invention discloses a power transmission apparatus. The power transmission apparatus includes: an input shaft including a male screw portion formed thereon; a pair of input gears formed on the input shaft to be freely rotatable with the male screw portion being interposed therebetween; an output gear formed to be rotatable in a state of being linked with the pair of input gears; and a power interrupting unit screw-coupled to the male screw portion of the input shaft, and configured to rectilinearly reciprocate along the input shaft by a rotation of the input shaft to be selectively engaged with any one of the pair of input gears so as to transmit a power.

Abstract: The present invention relates to a multistage automatic transmission comprising: a main body housing; an input shaft which is rotatably arranged in the main body housing and which rotates by an engine torque; a plurality of input side driving gears which have steps along the axial line of the input shaft and which are arranged into a pyramid shape to rotate together with the input shaft; a plurality of output side slave gears which have steps to correspond to the respective input side driving gears in directions opposite from one another; which engage with the respective input side driving gears, which are arranged into a pyramid shape, and the interior of which have a cam space; an output shaft arranged in the plurality of output side slave gears to receive power from the input shaft; and a shift control unit which is arranged in the cam space to selectively interconnect the output haft and the output side slave gear which receives power from any one of the plurality of input side driving gears, and to contr

Abstract: Multiple gear changes can easily be achieved by means of a straightforward and simple mechanical method, power transmission efficiency and the gear-changing sensation can be improved as compared with the prior at, and, in addition, fuel consumption can actually be reduced even as power performance is increased.

Abstract: The present invention relates to a vane pump with variable discharge volume, and comprising a pump housing; a cam ring having an elliptical cross-section for its inner circumference and outer circumference to form a compression chamber wherein a compression medium is compressed, and is accommodated in said pump housing so that it may rote; a rotor hat is accommodated such that a plurality of vanes may appear frequently on the outer circumference to undergo rotations in the compression chamber of said cam ring and compress said compression medium; and a cam ring rotation controller that contacts the outer circumference of said cam ring, and rotates said cam ring if the discharge pressure of said compression medium is equal to or more than its pressure setting and stops the rotation of said cam ring if the discharge pressure of said compression medium is less than its pressure setting to control rotations of said cam ring.

Abstract: A fluid pump of the present invention comprises a rotating chamber, a rotor which rotates about a rotating axis within the rotating chamber and includes a hub and a vane protruding radially outward from the hub; and a pair of blocking walls which cooperate with the vane and linearly move upon rotation of the rotor. A suction port for suction of a fluid and a discharge port for discharge of the fluid are provided at both positions adjacent to the pair of the blocking walls which are interposed between the ports.