Displacement of an object with hydraulic actuators
US11137330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2019 |
| Grant date | Oct 5, 2021 |
| Priority date | — |
| Expiry date | Sep 1, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0048
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An object is displaced alternately in opposite directions, using a hydraulic power unit having a rotatable body which includes the shaft of a hydraulic machine having electronically commutated valves. A motor drives the rotatable body. The hydraulic machine drives an actuator to displace the object in use. Energy is transformed from rotational kinetic energy of the rotatable body to elastic strain energy or elastic strain and gravitational potential energy of the object during a pumping phase and rotation of the rotatable body slows, but does not change direction. The potential energy then drives the hydraulic machine to motor and the rotatable shaft speeds up again, storing rotational kinetic energy. The displacement of the hydraulic machine is controlled throughout to match a time varying demand taking into account the varying speed of rotation of the rotatable shaft. The motor provides energy to compensate for losses and the process can repeat cyclically.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.