US 12,474,233 B2
Method for determining a bearing friction
Hannes Rauchenschwandtner, Poendorf (AT)
Assigned to PALFINGER AG, Bergheim bei Salzburg (AT)
Filed by Palfinger AG, Bergheim bei Salzburg (AT)
Filed on Aug. 22, 2023, as Appl. No. 18/236,714.
Application 18/236,714 is a continuation of application No. PCT/AT2022/060042, filed on Feb. 11, 2022.
Claims priority of application No. GM 50029/2021 (AT), filed on Feb. 23, 2021.
Prior Publication US 2023/0393022 A1, Dec. 7, 2023
Int. Cl. G01M 13/00 (2019.01); F16C 41/00 (2006.01); G01M 13/04 (2019.01)
CPC G01M 13/04 (2013.01) [F16C 41/00 (2013.01); F16C 2233/00 (2013.01); F16C 2326/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for determining a bearing friction in an arm system of a crane arm having at least one first crane arm and one second crane arm, wherein the second crane arm is mounted displaceably at least in some portions in the first crane arm by means of at least one bearing point and/or the second crane arm is mounted in a hinged manner on the first crane arm by means of at least one bearing point, and the arm system has at least one drive for the at least first and second crane arm, wherein:
in a first acquisition method step (i), at least one first value is acquired, which is characteristic of a bearing friction of the at least one bearing point during a first activation of the at least one drive of the arm system for moving at least the second crane arm relative to the first crane arm,
in a driving method step (ii), a second activation of the at least one drive of the arm system is effected, in which at least the second crane arm is moved relative to the first crane arm,
in a second acquisition method step (iii), during the second activation of the at least one drive at least one second value is acquired, which is a measured value that is characteristic of a bearing friction of the at least one bearing point, and
in an evaluation method step (iv), the bearing friction of the at least one bearing point is characterized through an evaluation of the at least one first value and the at least one second value, which is acquired during the second activation of the drive.