Valve assembly for an injection valve and injection valve

摘要

Valve assembly (14) of an injection valve (10), the valve assembly (14) comprising a valve body (20) including a central longitudinal axis (X), the valve body (20) comprising a cavity (24) with a fluid outlet portion (28), a valve needle (22) axially movable in the cavity (24), the valve needle (22) preventing a fluid flow through the fluid outlet portion (28) in a closing position and releasing the fluid flow through the fluid outlet portion (28) in further positions. The valve needle (22) has a guide portion (46) being designed to guide the valve needle (22) in the valve body (20) and having fluid channels (48) being designed to enable a fluid flow to the fluid outlet portion (28), a tip portion (50) being designed to act together with the valve body (20) to prevent the fluid flow through the fluid outlet portion (28), and a lower needle portion (42) being arranged axially between the guide portion (46) and the tip portion (50). The lower needle portion (42) comprises a recess portion (44) with an annular recess (45). The lower needle portion (42) has an axial length (L_LN) of about 7 mm and about 8 mm. The guide portion (46) has an axial length (L_G) of about 2 mm to about 3 mm. The channels (48) in the guide portion (46) have a total cross sectional area (A_CH) of about 2 mm 2 . Injection valve (10) with an actuator unit (16) and the valve assembly (14).