Title:
CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2020122315
Kind Code:
A
Abstract:
To switch a hydraulic motor driving a cooling fan from a normal rotation direction to a reverse rotation direction smoothly.SOLUTION: A fan driving device 16 driving a cooling fan 13 comprises: a hydraulic power source including a hydraulic pump 11; a hydraulic motor 14 connected to the hydraulic power source via a pair of main pipelines 18, 19 and rotating the cooling fan 13 in a normal rotation direction or in a reverse rotation direction by a pressure oil from the hydraulic pump 11; and a direction control valve 20 provided on the midway of the main pipelines 18, 19 and switching a direction of the pressure oil supplied to the hydraulic motor 14 between a normal rotation direction and a reverse rotation direction. On the midway of a motor side main pipeline 19B of the main pipeline 19, there are provided: a relief valve 26 setting pressure in the motor side main pipeline 19B; and an accumulator 27 accumulating pressure inside the motor side main pipeline 19B when rotation of the hydraulic motor 14 is switched from a normal rotation direction to a reverse rotation direction and a pressure inside the motor side main pipeline 19B becomes larger than a set pressure of the relief valve 26.SELECTED DRAWING: Figure 3
Inventors:
HIDAKA TAKAO
Application Number:
JP2019014203A
Publication Date:
August 13, 2020
Filing Date:
January 30, 2019
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E02F9/22; B60K11/04; E02F9/00; F01P5/04; F01P5/06
Attorney, Agent or Firm:
Hirowa Patent Office