US 12,344,511 B2
Lifting apparatus of crane and method of operation thereof
Simo Säkkinen, Hyvinkää (FI); Juhani Lukkari, Hyvinkää (FI); Lukas Pieper, Bochum (DE); and Kai Hartmann, Gevelsberg (DE)
Assigned to KONECRANES GLOBAL CORPORATION, Hyvinkää (FI)
Appl. No. 17/996,965
Filed by KONECRANES GLOBAL CORPORATION, Hyvinkää (FI)
PCT Filed Apr. 29, 2021, PCT No. PCT/FI2021/050321
§ 371(c)(1), (2) Date Oct. 24, 2022,
PCT Pub. No. WO2021/219942, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 20205438 (FI), filed on Apr. 29, 2020.
Prior Publication US 2023/0072458 A1, Mar. 9, 2023
Int. Cl. B66D 1/12 (2006.01); B66C 13/22 (2006.01); B66D 1/22 (2006.01); B66D 1/48 (2006.01)
CPC B66D 1/12 (2013.01) [B66C 13/22 (2013.01); B66D 1/22 (2013.01); B66D 1/485 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A hoisting mechanism of a crane comprising:
at least one rope drum for a hoist rope;
at least one hoist motor for driving the rope drum, the at least one hoist motor including a first hoist motor and a second hoist motor;
a gearing coupled between the at least one rope drum and the at least one hoist motor, the gearing comprising input gears on a hoist motor side, including a first input gear and a second input gear, and an output gear on a rope drum side,
wherein the gearing has a differential to which the first input gear and the second input gear are arranged,
wherein the first input gear and the second input gear are coupled to each other and further coupled to the output gear, the first hoist motor is connected to the first input gear, and the second hoist motor is connected to the second input gear,
wherein the differential includes a first input shaft and a second input shaft, and the first hoist motor and the second hoist motor are respectively coupled to the first input shaft and the second input shaft, and
wherein the first input gear and the second input gear have unequal total gear ratios relative to an output shaft, and the hoisting mechanism has means to determine hoisted load information, and the hoisting mechanism is arranged to determine, by using the load information, that at higher values of a load limit value, only the hoist motor coupled to the input shaft having a higher input gear is used, and at lower values of the load limit value, hoist motors coupled to the first input shaft and the second in-put shaft are simultaneously used.