A tumble system for the intake manifold of an internal combustion engine with an actuator made with shape memory material

摘要

A tumble system (13) for the intake manifold (3) of an internal-combustion engine (1) is provided with a number of cylinders (2). The tumble system (13) is provided with at least one throttle valve (14) for varying the section of passage of air through an intake pipe (9), which connects a cylinder (2) with the intake manifold (3). The throttle valve (14) has a throttle butterfly (15) mounted so as to rotate under the thrust of an actuator device (17) equipped with at least one actuator element (23), which is made of a shape-memory material that generates a torque by modifying its own geometry following upon application of an external stress of a physical nature.