Crawler crane and method for fine-tuning a basic operating position of such a crawler crane

A crawler crane (1) comprising:

• two crawler supports (9) having rotating crawlers (8),
• at least one transversal bridge (10) connecting the two crawler supports (9), wherein the at least one transversal bridge (10) comprises a transversal-bridge plane (38)
• a crane structure (3) having at least one crane boom (4, 5) connected to the transversal bridge (10) so as to be able to pivot about a vertical axis (7),
• a pivot articulation (6) that pivotally connects the transversal bridge (10) to the crane structure (3),
• wherein at least one of the crawler supports (9) is connected to the transversal bridge (10) via a double link (11) comprising:
• a lower link (12) that is articulated on the crawler support (9) via a crawler support lower pivot shaft (13) and on the transversal bridge (10) via a transversal bridge lower pivot shaft (14),
• an upper link (15) that is articulated on the crawler support (9) via a crawler support upper pivot shaft (16) and on the transversal bridge (10) via a transversal bridge upper pivot shaft (17), and
• an adjustment drive (20) for pivotally displacing at least one of the two links (12, 15) about at least one of the pivot shafts with which said link is articulated to the crawler support (9) and the transversal bridge (10),
• wherein said double link (11) enables compensation of a roll inclination about an axis longitudinal to a driving direction defined by the two crawler supports (9), such that the roll inclination is provided between a foot print plane (18) of the crawler support (9) and the transversal-bridge plane (38), wherein the crane structure (3) has no roll inclination relative to the transversal-bridge plane (38),
• wherein the adjustment drive (20) has a reduction gear,
• wherein the adjustment drive (20) has a threaded rod (22) connected to the crawler support (9) and a nut (24) connected to the driven lower link (12), the nut being complementary to the thread of the threaded rod (22),
• wherein the threaded rod (22) has a trapezoidal external thread and the nut (24) has a trapezoidal internal thread complementary thereto,
• wherein the nut (24) is connected to a lever end (26) of the lower link (12), the lever end being located opposite the transversal-bridge lower pivot shaft (14).

A crawler crane (1) comprising:

• two crawler supports (9) having rotating crawlers (8),
• at least one transversal bridge (10) connecting the two crawler supports (9),
• a crane structure (3) having at least one crane boom (4, 5) connected to the transversal bridge (10) so as to be able to pivot about a vertical axis (7),
• a pivot articulation (6) that pivotally connects the transversal bridge (10) to the crane structure (3),
• wherein at least one of the crawler supports (9) is connected to the transversal bridge (10) via a double link (11) comprising:
• a lower link (12) that is articulated on the crawler support (9) via a crawler support lower pivot shaft (13) and on the transversal bridge (10) via a transversal bridge lower pivot shaft (14),
• an upper link (15) that is articulated on the crawler support (9) via a crawler support upper pivot shaft (16) and on the transversal bridge (10) via a transversal bridge upper pivot shaft (17), and
• an adjustment drive (20) for pivotally displacing at least one of the two links (12, 15) about at least one of the pivot shafts with which said link is articulated to the crawler support (9) and the transversal bridge (10),
• wherein said double link (11) enables compensation of a roll inclination about an axis longitudinal to a driving direction defined by the two crawler supports (9),
• wherein the adjustment drive (20) has a threaded rod (22) connected to the crawler support (9) and a nut (24) connected to the driven lower link (12), the nut being complementary to the thread of the threaded rod (22), and
• wherein the nut (24) is connected via a linear guiding mechanism (57) to the driven link (12).