Failure diagnosing device, pump unit including same, and failure diagnosing method
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsTadahiko Kuroda, Takayuki Masuda, Takeshi Matsuura, Yuki Kato
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Abstract
A failure diagnosing device configured to diagnose failure of a swash plate pump includes: a history acquiring portion configured to acquire actual history data, the actual history data indicating a time-lapse change of the suction flow rate or suction pressure in a predetermined period of time; and a failure detecting portion configured to detect generation of an abnormality between a piston and a shoe based on the actual history data acquired by the history acquiring portion.
Claims14
A failure diagnosing device for a swash plate pump, the swash plate pump including:
- a cylinder block configured to rotate about a predetermined axis;
- a plurality of pistons inserted in the cylinder block so as to be reciprocable;
- shoes provided at the respective pistons so as to be swingable;
- and a swash plate on which the shoes slidably rotate, wherein:
- when the cylinder block rotates, the plurality of pistons reciprocate in the cylinder block, and thereby, the swash plate pump sucks and discharges an operating liquid,
- the failure diagnosing device comprising:
- a history acquiring portion configured to acquire actual history data indicating a time-lapse change of a suction flow rate or suction pressure in a predetermined period of time;
- and
- a failure detecting portion configured to detect generation of an abnormality between the piston and the shoe based on the actual history data acquired by the history acquiring portion.
A failure diagnosing method for a swash plate pump, the swash plate pump including:
- a cylinder block configured to rotate about a predetermined axis;
- a plurality of pistons inserted in the cylinder block so as to be reciprocable;
- shoes provided at the respective pistons so as to be swingable;
- and a swash plate on which the shoes slidably rotate, wherein:
- when the cylinder block rotates, the plurality of pistons reciprocate in the cylinder block, and thereby, the swash plate pump sucks and discharges an operating liquid,
- the failure diagnosing method comprising:
- a detecting step of detecting a suction flow rate or suction pressure of the operating liquid sucked by the swash plate pump;
- a history acquiring step of acquiring actual history data based on the suction flow rate or suction pressure detected in the detecting step, the actual history data indicating a time-lapse change of the suction flow rate or suction pressure in a predetermined period of time;
- and
- a failure detecting step of detecting generation of an abnormality between the piston and the shoe based on the actual history data acquired in the history acquiring step.
Dependencies are inferred from the claim text.