Title:
建設機械
Document Type and Number:
Japanese Patent JP6907779
Kind Code:
B2
Abstract:
To perform a revolving operation of an upper structure so that moving of the upper structure to a valley side against the revolving operation according to release of a parking brake can be prevented, when the revolving operation of the upper structure is performed in a state where the upper structure of a work machine positioned on a slope is braked by the parking brake.SOLUTION: A construction machine 1 comprises a lower structure 2, an upper structure 3, a revolving motor 21, a parking brake 22, a hydraulic pump 23, a direction switching valve 24, and an operation device 25 for driving the direction switching valve. A control device 50 operates the parking brake 22 so as to release the parking brake 22 when a detection value of a holding pressure of the revolving motor 21 becomes the same as a holding pressure of the revolving motor 21 stored in a storage portion 51, in revolving the upper structure 3 braked by the parking brake 22 with an operation of the operation device 25.SELECTED DRAWING: Figure 2
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| JPS6095207 | [Title of the device] Two pump type hydraulic circuit |
Inventors:
Tajima Ichiharu
Application Number:
JP2017143066A
Publication Date:
July 21, 2021
Filing Date:
July 24, 2017
Export Citation:
Assignee:
Kobelco Construction Machinery Co., Ltd.
International Classes:
E02F9/22; F15B20/00
Domestic Patent References:
| JP6010907A | ||||
| JP2006193905A | ||||
| JP62013620A | ||||
| JP2003105795A | ||||
| JP8020974A | ||||
| JP2016076801A | ||||
| JP62013619A | ||||
| JP60013128A | ||||
| JP2013213315A |
Foreign References:
| US20150152624 |
Attorney, Agent or Firm:
Creation International Patent Office