Abstract: The present disclosure provides a system of air-conditioning a seat for a vehicle and a method for controlling the same. The system of air-conditioning a seat for a vehicle includes: a blower disposed below the seat of the vehicle and configured to blow air onto a body contact surface; a first temperature sensor configured to detect a temperature of a front end of a suction hole of the blower; a second temperature sensor configured to detect a temperature of the body contact surface; a third temperature sensor configured to detect a room temperature of the vehicle; and an HVAC control unit configured to control an air-conditioning system of the vehicle. The HVAC control unit determines a blow direction mode of the air-conditioning system of the vehicle based on the temperatures detected by the first, the second, and the third temperature sensors when the blower is actuated.

Abstract: Disclosed herein is a method of treating a composite piston pin, including: preparing the piston pin of which at least surface layer includes a composite material including a reinforcing fiber and a resin; improving roughness by processing the surface layer of the piston pin; and forming a coating layer on the surface layer processed to reduce a friction coefficient of the piston pin.

Abstract: Disclosed herein is a method of treating a composite piston pin, including: preparing the piston pin of which at least surface layer includes a composite material including a reinforcing fiber and a resin; improving roughness by processing the surface layer of the piston pin; and forming a coating layer on the surface layer processed to reduce a friction coefficient of the piston pin.

Abstract: Disclosed herein is a method of treating a composite piston pin, including: preparing the piston pin of which at least surface layer includes a composite material including a reinforcing fiber and a resin; improving roughness by processing the surface layer of the piston pin; and forming a coating layer on the surface layer processed to reduce a friction coefficient of the piston pin.

Abstract: A hybrid piston pin and a manufacturing method thereof are provided. The hybrid piston pin includes a cylindrical pin formed of steel, a first reinforcement layer that is formed of a composite that includes reinforced fibers and a resin, having a cylindrical shape with a uniform thickness, and coupled to the interior surface of the cylindrical pin. A second reinforcement layer is formed of a composite that includes reinforced fibers having an elasticity that is less than the reinforced fibers of the first reinforcement layer. Further, a resin having a cylindrical shape with a uniform thickness is coupled to the interior surface of the first reinforcement layer.

Abstract: The present disclosure provides a system of air-conditioning a seat for a vehicle and a method for controlling the same. The system of air-conditioning a seat for a vehicle includes: a blower disposed below the seat of the vehicle and configured to blow air onto a body contact surface; a first temperature sensor configured to detect a temperature of a front end of a suction hole of the blower; a second temperature sensor configured to detect a temperature of the body contact surface; a third temperature sensor configured to detect a room temperature of the vehicle; and an HVAC control unit configured to control an air-conditioning system of the vehicle. The HVAC control unit determines a blow direction mode of the air-conditioning system of the vehicle based on the temperatures detected by the first, the second, and the third temperature sensors when the blower is actuated.

Abstract: An ultra-high-strength spring steel, for use as a valve spring steel in a vehicle engine, includes 0.5 to 0.7% by weight of C, 1.2 to 1.5% by weight of Si, 0.6 to 1.2% by weight of Mn, 0.6 to 1.2% by weight of Cr, 0.1 to 0.5% by weight of Mo, 0.05 to 0.8% by weight of Ni, 0.05 to 0.5% by weight of V, 0.05 to 0.5% by weight of Nb, 0.05 to 0.3% by weight of Ti, 0.3% or less by weight of Cu (but not 0%), 0.0001 to 0.3% by weight of Al, 0.03% or less by weight of N (but not 0%), 0.0001 to 0.003% by weight of O, and a remainder of Fe and other unavoidable impurities, based on 100% by weight of the ultrahigh-strength spring steel.

Abstract: Disclosed is a pneumatic valve for a vehicle that includes a valve housing that has an intake hole in an intake unit at one end, an exhaust hole and a relief hole in an exhaust unit at another end, and a channel through which air flows therein. An intake plunger selectively opens and closes the intake hole by sliding in the channel of the valve housing. A relief plunger selectively opens and closes the relief hole by sliding in the channel of the valve housing. An intake coil is disposed outside the valve housing and slides the intake plunger using an electromagnetic force; and a relief coil is disposed outside the valve housing and slides the relief plunger using an electromagnetic force.

Abstract: A piezo valve actuated by an electric voltage. The piezo valve includes a valve body having at least one port for introducing a fluid therethrough, an internal chamber communicating with the port, at least one valve seat for allowing the fluid to pass therethrough, and a circuit board for supplying an electric voltage; a valve unit opening or closing the valve seat of the valve body; a piezo plate bending-strained to either of opposite sides in response to the electric voltage, thus moving the valve unit; and a fastener fastening an end of the piezo plate to the valve body in a state in which a position of the piezo plate can be adjusted. Because the end of the piezo plate is fastened by the fastener, it is possible to fasten the piezo plate in a state in which the fastened position of the piezo plate can be adjusted.

Abstract: A piezo valve actuated by an electric voltage. The piezo valve includes a valve body having at least one port for introducing a fluid therethrough, an internal chamber communicating with the port, at least one valve seat for allowing the fluid to pass therethrough, and a circuit board for supplying an electric voltage; a valve unit opening or closing the valve seat of the valve body; a piezo plate bending-strained to either of opposite sides in response to the electric voltage supplied from the circuit board, thus moving the valve unit; and a fastener fastening an end of the piezo plate to the valve body in a state in which a position of the piezo plate can be adjusted. Because the end of the piezo plate is fastened by the fastener, it is possible to fasten the piezo plate in a state in which the fastened position of the piezo plate can be adjusted.

Abstract: A sintered alloy having an improved wear resistance and a workability for a valve seat. The alloy contains iron as a main component, carbon, silicon, chromium, molybdenum, cobalt, maganese, lead, vanadium, advantageously boron nitride, and tungsten. The strength, wear resistance, and material properties are improved by a sub-zero treatment. Sintered alloy with wear resistance used for a valve seat comprises Fe as a main component, C of 1.2 to 1.7 wt %, Cr of 3.5 to 5.0 wt %, Mo of 2.0 to 4.0 wt %, V of 3.0 to 5.0 wt %, W of 7.0 to 10.0 wt %, Co of 2.0 to 3.5 wt %, boron nitride of 0.1 to 1.0 wt %, S of 0.2 to 0.4 wt %, Mn of 0.2 to 0.5 wt %, advantageously 0.2 to 0.6% Si, and Pb of 10.0 to 15.0 wt %. Sintered alloy for an valve seat is manufactured by a sub-zero treatment so that the amount of metallic particles separated from a base matrix decreases and a size of the separated metallic particle becomes small.

Abstract: A Fe-base sintered alloy for a valve seat for use in internal combustion engines, which constitutes a chemical composition of 0.4 to 2% of C, 0.5 to 5% of Cr, 5 to 15% of Mo, 0.2 to 2% of Ni, 0.4 to 2% of Co, 8 to 20% of Cu, 0.01 to 0.5% of S, and the balance Fe, wherein percentages are by weight. The Fe-base sintered alloy possesses high strength and high rigidity, and hence exhibits excellent abrasive and corrosion wear resistance properties, as well as excellent lubricity.