Abstract: A water pump pulley for a cooling system for a vehicle is provided. The water pump pulley for a cooling system of a vehicle includes an outer rotational member formed of thermoplastic resin, the outer rotational member being provided at an outer circumference with one or more V-shaped circumferential grooves and at a central portion with a space and an inner rotational member integrally coupled to the space of the outer rotational member through an insert injection molding process and provided with bolt holes for connecting to a rotational shaft of a water pump side. The outer rotational member is provided at one or both of opposite surfaces with a plurality of reinforcing ribs. The inner rotational member is provided with a slip preventing member for enhancing integration with the outer rotational member and dispersing force.

Abstract: A torque converter for a vehicle includes a front cover integrally formed with a boss to which a crank shaft of an engine side is connected, an impeller connected to the front cover to rotate together with the front cover, a turbine disposed facing the impeller, a stator disposed between the impeller and the turbine to convert flow of oil directed from the turbine, a lockup clutch mechanism for directly connecting the engine to the turbine. A blade of the impeller and/or the turbine is provided with inner and outer projections coupled to shell and core of the impeller and/or the turbine. Each of the inner and outer and inner projections includes a base located on a slit formed on the shell/core and an extending section extending from the base, the extending section being bent after penetrating the slit.