US 12,280,990 B2
Winch drive device in crane
Masaki Okubo, Hyogo (JP); Hitoshi Sakurai, Hyogo (JP); Yoshiki Kamon, Hyogo (JP); and Taisuke Tsunoo, Hyogo (JP)
Assigned to KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima (JP)
Appl. No. 18/041,886
Filed by KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima (JP)
PCT Filed Jul. 30, 2021, PCT No. PCT/JP2021/028367
§ 371(c)(1), (2) Date Feb. 16, 2023,
PCT Pub. No. WO2022/044699, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 2020-141397 (JP), filed on Aug. 25, 2020.
Prior Publication US 2023/0322532 A1, Oct. 12, 2023
Int. Cl. B66D 1/00 (2006.01); B66D 1/44 (2006.01); B66D 1/54 (2006.01)
CPC B66D 1/44 (2013.01) [B66D 1/54 (2013.01); B66D 2700/0158 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A winch drive device in a crane, comprising:
a hydraulic motor that rotates a winch drum disposed on the crane;
a tank;
a drain pipeline for feeding drain oil in the hydraulic motor back to the tank;
a hydraulic pump driven by an engine, the hydraulic pump being configured to discharge hydraulic oil;
a pressure supply pipeline connected to the hydraulic pump;
a pressure detection unit;
a connection state determining unit;
a pressure increase suppression unit; and
a multi-coupler having a first joint, a second joint, a support member supporting the first and second joints, a first mating joint, a second mating joint, the first and second mating joints being attachable/detachable respectively to/from the first and second joints, and a mating support member supporting the first and second mating joints, the mating support member being attachable/detachable to/from the support member,
wherein the drain pipeline includes:
a tank-side pipeline part having one end connected to the tank and the other end connected to the first joint; and
a motor-side pipeline part having one end connected to the first mating joint and the other end connected to the hydraulic motor,
the pressure supply pipeline includes:
a pump-side pipeline part having one end connected to the hydraulic pump and the other end connected to the second joint; and
a detection target pipeline part having one end connected to the second mating joint,
when the support member is attached to the mating support member, the first joint and the first mating joint are connected to each other to couple the tank-side pipeline part and the motor-side pipeline part of the drain pipeline to each other, and the second joint and the second mating joint are connected to each other to couple the pump-side pipeline part and the detection target pipeline part of the pressure supply pipeline to each other,
when the engine is started in a state where the support member is attached to the mating support member, to drive the hydraulic pump, a pressure of the hydraulic oil increases in the detection target pipeline part of the pressure supply pipeline,
the pressure detection unit is configured to detect a pressure of the hydraulic oil in the detection target pipeline part,
the connection state determining unit determines whether the tank-side pipeline part and the motor-side pipeline part of the drain pipeline are connected to each other, based on a pressure detected by the pressure detection unit, and
the pressure increase suppression unit is configured such that, when the connection state determining unit determines that the tank-side pipeline part and the motor-side pipeline part are not connected to each other in a state where the engine is started, the pressure increase suppression unit carries out an operation for suppressing an increase in a pressure of the hydraulic motor.