Title:
WORK MACHINE
Document Type and Number:
Japanese Patent JP2019014591
Kind Code:
A
Abstract:
To immediately prevent fall of a suspended load if an abnormal state arises in a command signal that controls the capacity of a motor in a work machine including a winch drum driven by a secondary control system.SOLUTION: A crane comprises: a main winding winch; a hydraulic pump 51 of variable capacity type; a hydraulic motor 52 of variable capacity type for both inclinations, which rotates the main winding winch; a first main oil passage 50A; a second main oil passage 50B; a motor capacity control unit 50T; and a communication switching unit 50S. In conjunction with a situation in which a command signal for motor capacity control falls in a specific abnormal state, the motor capacity control unit 50T sets a capacity for the hydraulic motor 52 to an emergency capacity that is greater than zero and at which torque can be generated for the main winding winch in a rotating direction in which a suspended load can be lifted. In a case where the command signal falls in an abnormal state, a communication switching unit 50S blocks circulation of hydraulic oil in each of the first main oil passage 50A and the second main oil passage 50B.SELECTED DRAWING: Figure 2
Inventors:
IGAUE TAKAYUKI
HORI NAOTO
HORI NAOTO
Application Number:
JP2017134440A
Publication Date:
January 31, 2019
Filing Date:
July 10, 2017
Export Citation:
Assignee:
KOBE STEEL LTD
KOBELCO CONTSTRUCTION MACHINERY LTD
KOBELCO CONTSTRUCTION MACHINERY LTD
International Classes:
B66D1/54; B66D1/44; F15B11/02; F15B20/00
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Takashi Yukitake
Masataka Otani
Takashi Yukitake