Throttle valve for an internal combustion engine provided with a metal valve seat overmoulded inside a valve body made of a plastic material

摘要

Throttle valve (1) for an internal combustion engine; the throttle valve (1) has: a valve body (2); a tubular feeding duct (4); a throttle plate (5) arranged inside the feeding duct (4) and splined on a shaft (6) mounted in a rotatory manner; an annular inner body (17) which is made of a first material, defines a central portion of the feeding duct (4), and is arranged in the area of the shaft (6) so that in a closing position the outer edge (26) of the throttle plate (5) is close to an inner surface (18) of said inner body (17); and an outer body (19) which is made of a second material different from the first material, encompasses the inner body (17) leaving visible the inner surface (18) of the inner body (17), and makes up the remaining part of the feeding duct (4) at the opposite sides of the inner body (17).