Hydraulic control system and method for a bucket shake operation in a work machine with a hydraulic pump and unloader valve
US11512449B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2021 |
| Grant date | Nov 29, 2022 |
| Priority date | — |
| Expiry date | Dec 14, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/405
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An excavator or other work machine includes a tilting bucket operated by a hydraulic actuator controlled by a bucket control valve responsive to control signals including a bucket shake control signal, which causes the bucket to move repeatedly in the rack and dump directions to shake debris from the bucket in a bucket shake operation. The actuator is powered by pressure from a hydraulic pump, and a control system includes an unloader valve to relieve pressure from the supply line to unload the pump when there is no demand for power. The control system is arranged to maintain a constant pressure signal in a load sensing line, to maintain the unloader valve constantly in a closed condition, for the duration of the bucket shake operation. This may be achieved by pressurising an actuator of a quick coupler to lock the bucket to the machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.