Slewing-type working machine
US9624647B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 11, 2012 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Dec 6, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86027
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A slewing-type working machine includes: a slewing motor which is a hydraulic motor for slewing; a variable-displacement hydraulic pump; a slewing operation device including an operation member; a control valve controlling the slewing motor based on an operation signal thereof; a pump regulator; a relief valve letting excess fluid to a tank; operation detectors detecting an operation direction and amount of the operation member; a motor rotational speed detector; and a controller controlling a discharge flow rate of the hydraulic pump. The controller obtains a deviation between a target rotational speed of the slewing motor obtained from a slewing operation amount and an actual rotational speed detected by the motor rotational speed detector, and controls the discharge flow rate to make the deviation closer to 0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.