Title:
液圧ポンプの故障診断装置
Document Type and Number:
Japanese Patent JP6422707
Kind Code:
B2
Abstract:
A malfunction diagnosing device X1 that includes pistons M1 to M9 arranged in a circumferential direction and discharges oil with rotation in the circumferential direction comprises: a pressure sensor 30 for detecting a pressure value of oil discharged from a hydraulic pump in rotation; a speed sensor 40 for detecting a rotation phase of the hydraulic pump 2 at the time when a pressure value of oil is detected by the pressure sensor 30; a phase calculation part 50; and a rendering part 60 for rendering a model of a relationship between pressure values of oil detected by the pressure sensor 30 and rotation phases of the hydraulic pump 2 detected by the speed sensor 40 and the phase calculation part 50 to thereby obtain pulsating waveform data. This makes it possible to diagnose a malfunction of the hydraulic pump 2 without influence of a change in the rotation speed of the hydraulic pump 2.
Inventors:
Nobuyuki Tomochika
Hideyoshi Yoshihara
Hideyoshi Yoshihara
Application Number:
JP2014178393A
Publication Date:
November 14, 2018
Filing Date:
September 02, 2014
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
Kobelco Construction Machinery Co., Ltd.
Kobelco Construction Machinery Co., Ltd.
International Classes:
F04B51/00
Domestic Patent References:
| JP2012524196A | ||||
| JP2011190780A | ||||
| JP56141079A | ||||
| JP10150793A |
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Muramatsu Toshiro
Masataka Otani
Muramatsu Toshiro