An actuator for axial displacement of an object, includes an actuator piston and an actuator piston rod, wherein the piston is displaceable in the axial direction, and a hydraulic circuit including a liquid filled chamber, a first end of the actuator piston rod being displaceable in the axial direct
An actuator for axial displacement of an object, includes an actuator piston and an actuator piston rod, wherein the piston is displaceable in the axial direction, and a hydraulic circuit including a liquid filled chamber, a first end of the actuator piston rod being displaceable in the axial direction within the liquid filled chamber, wherein an axially extending recess mouth in the liquid filled chamber is arranged to receive the first end. The actuator piston rod in the area of the first end presents a cylindrical envelope surface, and the recess presents a cylindrical inner surface having a matching shape, wherein the actuator includes a passage extending between the recess and liquid filled chamber when the cylindrical envelope surface and the cylindrical inner surface are located in overlapping configuration, wherein the passage presents at a braking overlap section a cross section area that decreases as a function of increasing overlap.
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1. An actuator for axial displacement of an object, the actuator (1) comprises: an actuator piston (4) comprising an actuator piston rod (7) having a first end (8) and a second end (9), wherein the actuator piston (4) is displaceable in the axial direction in a reciprocating manner between a first p
1. An actuator for axial displacement of an object, the actuator (1) comprises: an actuator piston (4) comprising an actuator piston rod (7) having a first end (8) and a second end (9), wherein the actuator piston (4) is displaceable in the axial direction in a reciprocating manner between a first position and a second position, anda hydraulic circuit (20) comprising a liquid filled chamber (21), the first end (8) of the actuator piston rod (7) being arranged to be displaced in the axial direction within said liquid filled chamber (21) in conjunction with axial displacement of the actuator piston (4),wherein an axially extending recess (22) mouth in said liquid filled chamber (21) and is arranged to receive the first end (8) of the actuator piston rod (7) when the actuator piston (4) is in said first position,characterized in that the actuator piston rod (7) in the area of the first end (8) presents a cylindrical envelope surface (24), and in that the recess (22) presents a cylindrical inner surface (25), the cylindrical envelope surface (24) and the cylindrical inner surface (25) presenting matching shapes,wherein the actuator comprises a passage extending between the recess (22) and the liquid filled chamber (21) when the cylindrical envelope surface (24) and the cylindrical inner surface (25) are located in overlapping configuration, wherein a section of a predetermined maximum overlap is constituted by a braking overlap (35), the passage presenting at said braking overlap section (35) a cross section area (A1) that decrease as a function of increasing overlap between the cylindrical envelope surface (24) and the cylindrical inner surface (25), wherein said cross section area (A1) of the passage at a beginning of said braking overlap section (35) decrease with decreasing derivative and at an end of said braking overlap section (35) decrease with increasing derivative, as a function of increasing overlap. 2. The actuator according to claim 1, wherein said beginning of the braking overlap section (35) represent at least 30% of the maximum overlap. 3. The actuator according to claim 2, wherein said end of the braking overlap section (35) represent at least 10% of the maximum overlap. 4. The actuator according to claim 1, wherein said end of the braking overlap section (35) represent at least 10% of the maximum overlap. 5. The actuator according to claim 1, wherein the predetermined maximum overlap, in addition to said braking overlap section (35) and adjacent an end of the braking overlap section (35), comprises a seating overlap section (36), the passage presenting at said seating overlap section (36) a cross section area (A1) that is constant as a function of increasing overlap between the cylindrical envelope surface (24) and the cylindrical inner surface (25). 6. The actuator according to claim 5, wherein said seating overlap section (36) represent less than 20% of the maximum overlap. 7. The actuator according to claim 1, wherein the axial length of the maximum overlap is greater than 1 mm and less than 5 mm. 8. The actuator according to claim 7, wherein the axial length of the maximum overlap is about 2.5 mm. 9. The actuator according to claim 1, wherein the actuator piston rod (7) in the area of the first end (8) presents an end edge (26) having an indentation forming said passage. 10. The actuator according to claim 9, wherein said indentation is constituted by a groove (27) extending from an end surface (28) of the first end (8) of the actuator piston rod (7) to the cylindrical envelope surface (24). 11. The actuator according to claim 10, wherein the axial length of said groove (27) in said cylindrical envelope surface (24) is greater than the maximum overlap between the cylindrical envelope surface (24) and the cylindrical inner surface (25). 12. The actuator according to claim 11, wherein said groove comprises parallel side surfaces (33). 13. The actuator according to claim 10, wherein said groove comprises parallel side surfaces (33). 14. The actuator according to claim 1, wherein the hydraulic circuit (20) has an inlet conduit (29) leading into the liquid filled chamber (21) and an outlet conduit (30) leading from said liquid filled chamber (21), said outlet conduit (30) presenting a cross section area (A2) having a minimum area that is less than a factor 2 times the maximum area of the cross section area (A1) of said passage. 15. The actuator according to claim 14, wherein the minimum area of the cross section area (A2) of the outlet conduit (30) is equal to or bigger than the maximum area of the cross section area (A1) of said passage. 16. The actuator according to claim 14, wherein the minimum area is less than a factor 1.5 times the maximum area of the cross section area (A1) of said passage. 17. The actuator according to claim 1, wherein the actuator comprises: a cylinder (5), wherein the actuator piston (4) comprises an actuator piston disc (6) displaceable in the axial direction within said cylinder (5) in conjunction with axial displacement of the actuator piston (4), anda pressure fluid circuit (13) arranged for controllable fluid communication with the cylinder (5).
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