A throttle valve comprising: a valve body; an intake duct, which is obtained in the valve body; a throttle plate, which is arranged in the intake duct; a shaft, which is mounted so as to rotate in the valve body and supports the throttle plate; an electric motor; a gear transmission, which couples the electric motor to the shaft and comprises an end gear, which is integral with the shaft; a return spring, which is designed to rotate the throttle plate towards a closing position; a striking element, which is obtained in the valve body and establishes an intermediate position of partial opening; and a countering spring, which is fitted on the end gear, is designed to rotate the throttle plate towards an opening position and up to the intermediate position, and has a first end, which is designed to rest against the striking element during the rotation of the end gear; wherein the end gear comprises at least one coupling element (24, 25), which is designed to rest against the first end of the countering spring; the throttle valve is characterised in that: the end gear comprises a main component, which supports the countering spring and an additional component, which is coupled to the main component and supports the coupling element (24, 25); the additional component is heat-welded to the main component so as to prevent the rotation between the two components (22, 23); and the main component is shaped so as to enable a rotation between the two components (22, 23) before the two components (22, 23) are heat-welded. a valve body; an intake duct, which is obtained in the valve body; a throttle plate, which is arranged in the intake duct; a shaft, which is mounted so as to rotate in the valve body and supports the throttle plate; an electric motor; a gear transmission, which couples the electric motor to the shaft and comprises an end gear, which is integral with the shaft; a return spring, which is designed to rotate the throttle plate towards a closing position; a striking element, which is obtained in the valve body and establishes an intermediate position of partial opening; and a countering spring, which is fitted on the end gear, is designed to rotate the throttle plate towards an opening position and up to the intermediate position, and has a first end, which is designed to rest against the striking element during the rotation of the end gear; wherein the end gear comprises at least one coupling element (24, 25), which is designed to rest against the first end of the countering spring; the throttle valve is characterised in that: the end gear comprises a main component, which supports the countering spring and an additional component, which is coupled to the main component and supports the coupling element (24, 25); the additional component is heat-welded to the main component so as to prevent the rotation between the two components (22, 23); and the main component is shaped so as to enable a rotation between the two components (22, 23) before the two components (22, 23) are heat-welded. the end gear comprises a main component, which supports the countering spring and an additional component, which is coupled to the main component and supports the coupling element (24, 25); the additional component is heat-welded to the main component so as to prevent the rotation between the two components (22, 23); and the main component is shaped so as to enable a rotation between the two components (22, 23) before the two components (22, 23) are heat-welded.