Patents Assigned to Doosan Industrial Vehicle Co., Ltd.
  • Patent number: 11845412
    Abstract: Disclosed herein is an electromagnetic brake system. The electromagnetic brake system includes a brake disc configured to be rotated together with a drive shaft of a drive motor configured to operate a vehicle wheel, an armature disc configured to be movable so as to be in close contact with or so as to be separated from one side of the brake disc, an elastic member configured to elastically press the armature disc to the one side of the brake disc to a direction in which the armature disc is in close contact with the brake disc, and an inductor configured to separate the armature disc from the brake disc by an electrical signal. The brake disc includes a tube portion mounted on the drive shaft, and a plate portion provided to extend in an outward direction of the tube portion to be opposite to the armature disc. The tube portion and the plate portion are provided as a single member in which the tube portion and the plate portion are integrally formed with each other.
    Type: Grant
    Filed: September 15, 2021
    Date of Patent: December 19, 2023
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventor: Jin Woo Choi
  • Patent number: 11691537
    Abstract: The present disclosure relates to an electric forklift and a method of driving the same which are capable of increasing a lifespan of a battery, and the electric forklift includes: a traveling motor which operates a wheel; a working machine motor which operates a working machine; a control unit which controls the operations of the traveling motor and the working machine motor based on an output control signal inputted from the outside; a battery which supplies electric power to the traveling motor, the working machine motor, and the control unit; and a temperature detecting unit which detects a temperature of the battery, in which the control unit controls an operation of at least one of the traveling motor and the working machine motor based on a detected temperature from the temperature detecting unit.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: July 4, 2023
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventor: Jin Yong Lee
  • Patent number: 11693419
    Abstract: The present disclosure relates to an ISG control system and an ISG control method for a construction machine capable of controlling ISG even in a working state of a construction machine, the ISG control system including: a surrounding environment determinator configured to determine surrounding environment of the construction machine; and a vehicle controller configured to determine whether the construction machine is in a working state or a traveling state based on a determination result from the surrounding environment determinator, wherein the vehicle controller controls an engine based on a preset work ISG condition when it is determined that the construction machine is in the working state, and wherein the vehicle controller controls the engine based on a preset travel ISG condition when it is determined that the construction machine is in the traveling state.
    Type: Grant
    Filed: March 31, 2021
    Date of Patent: July 4, 2023
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventors: Hyunkyu Kang, Jinsan Song, Semin Park
  • Publication number: 20220396460
    Abstract: According to various example embodiments, a pallet clamp apparatus for clamping a pallet to a pair of forks provided in a forklift includes a housing disposed adjacent to each of the pair of forks, a locking member, at least a portion of the locking member protruding to the outside of the housing to fix the pallet, a spring member configured to elastically press the locking member toward the inner side of the fork in a lateral direction, and a release member configured to release fixing of the locking member by pressing the spring member.
    Type: Application
    Filed: March 25, 2022
    Publication date: December 15, 2022
    Applicant: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventor: Woong KIM
  • Patent number: 11440780
    Abstract: A system of controlling a lowering speed of a work lever of a forklift which includes, a hydraulic motor connected to the work lever through a hydraulic line to transmit a power to the work lever; an electronic solenoid valve for controlling the hydraulic motor connected to the work lever; a weight sensor provided at one side of the work lever, the weight sensor measuring a weight of a load placed on the work lever and transmitting the measured value to a controller; and a controller for controlling an RPM of the hydraulic motor and a current amount of the electronic solenoid valve based on the measured value transmitted from the weight sensor.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: September 13, 2022
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventors: Jaesung Choi, Jinyong Lee, Dongho Han, Beomkyun Yu
  • Patent number: 11434845
    Abstract: An industrial vehicle work guide system is disclosed. An industrial vehicle work guide system according to an embodiment of the present invention includes: a memory configured to store engine used data, a driving time, a fuel consumption amount, and reference fuel efficiency; a display module configured to output a guide message; and an analysis module configured to calculate actual fuel efficiency by using the engine used data, the driving time, and the fuel consumption amount, compare the actual fuel efficiency with the reference fuel efficiency, and control the display module so that the display module outputs a guide message when the actual fuel efficiency is lower than the reference fuel efficiency.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: September 6, 2022
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventor: Byung Kwon Lee
  • Patent number: 11433867
    Abstract: The present disclosure relates to an electric brake system for an electric vehicle, which is more economical by simplifying a configuration of an electric vehicle that includes a main service brake and an electromagnetic brake, the electric brake system including an inductor, in a spherical shape, formed so that a drive axle penetrates through a center portion of the inductor; a plurality of springs inserted into holes defined in the inductor; an armature, in a disk shape, provided to contact the spring; and a friction disk mounted on a side of a motor, where a braking force is generated by operating the friction disk toward the armature.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: September 6, 2022
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventor: Jun Il Yi
  • Publication number: 20130145751
    Abstract: The present disclosure relates to an energy reclaiming system for an electric forklift truck. The energy reclaiming system includes an electronic device operated by a motor when a working machine is raised and operated by a generator when the working machine is lowered, a hydraulic pump/motor connected to the electronic device and configured to perform two functions of a hydraulic pump and a hydraulic motor, a main control valve unit including a lift cylinder operating unit connected to the hydraulic pump/motor and configured to operate a lift cylinder and a secondary consumer operating unit connected to the hydraulic pump/motor and configured to operate a secondary consumer, and a control lever including a control valve configured to control the lift cylinder or the secondary consumer through the lift cylinder operating unit and the secondary consumer operating unit of the main control valve unit, respectively.
    Type: Application
    Filed: May 19, 2011
    Publication date: June 13, 2013
    Applicant: DOOSAN INDUSTRIAL VEHICLE CO., LTD
    Inventors: Dong Ho Han, Dal Sik Jang
  • Publication number: 20130055704
    Abstract: The present disclosure relates to an apparatus for controlling a raise speed of a working machine for heavy equipment that includes first and second pumps, a main control valve unit that includes two lift cylinder operation units connected with the first and second pumps and operating two lift cylinders and one tilt cylinder operation unit operating two tilt cylinders, a priority valve that is provided in a working fluid line between the second pump and the main control valve unit, and a lift lever that includes a remote control valve connected with the two lift cylinder operation units through a pilot oil line, respectively, and controlling the two lift cylinders through the two lift cylinder operation units, in which a valve control unit, which electrically controls the flow of pilot oil in proportion to the RPM of an engine to allow or stop the working fluid flowing from any one of the two lift cylinder operation units to the two lift cylinders, is disposed in any one of two pilot oil lines between the two
    Type: Application
    Filed: May 19, 2011
    Publication date: March 7, 2013
    Applicant: DOOSAN INDUSTRIAL VEHICLE CO., LTD
    Inventors: Chan Heo, Hyun Gie Koh
  • Patent number: D664323
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: July 24, 2012
    Assignee: Doosan Industrial Vehicle Co., Ltd.
    Inventors: Young Jin Lee, Eui Sik Kim
  • Patent number: D940989
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: January 11, 2022
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventors: Woong Kim, Sangyoun Moon
  • Patent number: D969441
    Type: Grant
    Filed: February 26, 2021
    Date of Patent: November 8, 2022
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventor: Hyokyoung Lim
  • Patent number: D969442
    Type: Grant
    Filed: March 16, 2021
    Date of Patent: November 8, 2022
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventor: Juhyoung Lee
  • Patent number: D981077
    Type: Grant
    Filed: March 29, 2021
    Date of Patent: March 14, 2023
    Assignee: DOOSAN INDUSTRIAL VEHICLE CO., LTD.
    Inventor: Kyungjin Lee