Abstract: A vehicle power supply system is provided. The vehicle power supply system includes a first power line connected by a first battery, a second power line to which a second battery is connected, a voltage converter, a charging and discharging control device that controls charging and discharging of the batteries by operating inverters and the voltage converter, and a permission unit that permits or prohibits execution of the electrical pass control for charging the second battery with power discharged from the first battery. The charging and discharging control device executes the electrical pass control when a second SOC is equal to or less than a predetermined value and the electrical pass control is permitted by the permission unit. The permission unit permits the execution of the electrical pass control with the power discharged from the first battery being supplied to a second drive motor through the voltage converter as a condition.

Abstract: A vehicle power supply system is provided. The system includes a first power line connected by a first inverter and a first battery, a second power line connected by a second inverter and a second battery, a voltage converter, and a charging and discharging control device operating the inverters and the voltage converter. The control device charges the second battery with second regenerative electric power that is power supplied from the second inverter to the second power line in a case where a second SOC is equal to or less than the second regeneration permission upper limit during regenerative deceleration, and prohibits the second battery from being charged and supplies at least a portion of the second regenerative electric power to the first battery through the voltage converter and the first power line when the second SOC is larger than the second regeneration permission upper limit.

Abstract: The electric vehicle includes a first battery, a second battery having an output weight density higher than that of the first battery and an energy weight density lower than that of the first battery, a motor generator, an electric power conversion circuit, and a control device for controlling the electric power conversion circuit. The control device controls the electric power conversion circuit so that, during a powering operation of the motor generator, at least a part of electric power necessary for changing a vehicle speed among requested electric power is discharged from the second battery, and remaining electric power obtained by subtracting the electric power discharged from the second battery from the requested electric power is discharged from the first battery; and it controls the electric power conversion circuit so that, during a regenerative operation of the motor generator, electric power generated is charged to the second battery.

Abstract: A half bearing for a crankshaft of an internal combustion engine, which includes crush relieves at both circumferential end portions of an inner circumferential surface of the half bearing, is provided. The half bearing further includes an axial groove at least at a position adjacent to a crush relief on a rear side of a relative rotation direction of the crankshaft, and adjacent to the inner circumferential surface of the half bearing. The axial groove extends along an entire width of the inner circumferential surface of the half bearing.

Abstract: A cylindrical sliding bearing having a cylindrical steel back metal, and a bearing alloy layer, serving as a sliding surface, on the inside of the steel back metal is provided. The cylindrical sliding bearing further have a coat layer of Bi or a Bi-based alloy formed on the outer back surface of the steel back metal. Preferably, the coat layer is made from the Bi-based alloy of 1 to 30 mass % of one or more kinds of Sn, Pb, In, Ag and Cu; and the balance being Bi and inevitable impurities.

Abstract: A half bearing for a crankshaft of an internal combustion engine, which includes crush relieves at both circumferential end portions of an inner circumferential surface of the half bearing, is provided. The half bearing further includes an axial groove at least at a position adjacent to a crush relief on a rear side of a relative rotation direction of the crankshaft, and adjacent to the inner circumferential surface of the half bearing. The axial groove extends along an entire width of the inner circumferential surface of the half bearing.

Abstract: A cylindrical sliding bearing having a cylindrical steel back metal, and a bearing alloy layer, serving as a sliding surface, on the inside of the steel back metal is provided. The cylindrical sliding bearing further have a coat layer of Bi or a Bi-based alloy formed on the outer back surface of the steel back metal. Preferably, the coat layer is made from the Bi-based alloy of 1 to 30 mass % of one or more kinds of Sn, Pb, In, Ag and Cu; and the balance being Bi and inevitable impurities.