Device for locking a piston rod of a piston of an actuator which is pressurizable in order to disengage a parking lock and is spring-loaded in order to engage the parking lock

A device (2;

• 202) for locking a piston rod (7) of a piston (4) of an actuator, which is pressurizable in order to disengage a parking lock (3) and is spring-loaded in order to engage the parking lock (3), the device (2;
• 202) comprising:
• an electrically actuatable electromagnet (19) with an armature rod (20) that is axially movable against a spring force of a preloading spring (21), the armature rod (20) comprising two actuating contours (22, 23) that are axially spaced apart and face each other;
• wherein the actuating contour (22) positioned proximate the electromagnet (19) is associated with a first latching mechanism (24) operable to mechanically fix the piston (4) in an engaged condition of the parking lock (3),
• wherein the actuating contour (23) positioned remote from the electromagnet (19) is associated with a second latching mechanism (25) operable to mechanically fix the piston (4) in a disengaged condition of the parking lock (3),
• wherein interlocking elements (28) of the first latching mechanism (24) are separate and axially spaced from interlocking elements (29) of the second latching mechanism (25), and an axial distance (X) between a base point (26) of the actuating contour (22) positioned proximate the electromagnet (19) and a base point (27) of the actuating contour (23) positioned remote from the electromagnet (19) is sized such that the piston (4) is mechanically fixable by only the first latching mechanism (24) in the engaged condition of the parking lock (3) and by only the second latching mechanism (25) in the disengaged condition of the parking lock (3),
• wherein both of the first and second latching mechanisms (24, 25) are centrally arranged within the piston (4), the interlocking elements (28, 29) of both of the first and second latching mechanisms (22, 23) are disposed within a housing-affixed component (30) in an axially fixed manner, and the interlocking elements (28, 29) of the first and second latching mechanisms (22, 23) are radially displaceable relative to the housing-affixed component (30) and are selectively engageable with the piston (4) by a respective actuating contour (22, 23),
• wherein the actuating contour (23) positioned remote from the electromagnet (19) blocks movement of the interlocking elements (29) of the second latching mechanism (25) counter to the spring force of the preloading spring (21) when the parking lock (3) is in the disengaged condition of the parking lock (3) and the electromagnet (19) is in an energized condition of the electromagnet (19), and the actuating contour (23) positioned remote from the electromagnet (19) releases the interlocking elements (29) of the second latching mechanism (25) for movement with the preloading spring (21) when the electromagnet (19) is in a non-energized condition of the electromagnet (19), and
• wherein the actuating contour (22) positioned proximate the electromagnet (19) blocks movement of the interlocking elements (28) of the first latching mechanism (24) with the preloading spring (21) when the parking lock (3) is in the engaged condition of the parking lock (3) and the electromagnet (19) is in the non-energized condition of the electromagnet (19), and the actuating contour (22) positioned proximate the electromagnet (19) releases the interlocking elements (28) of the first latching mechanism (24) for movement against the spring force of the preloading spring (21) when the electromagnet (19) is in the energized condition of the electromagnet (19).