Planetary gear PTO unit with a hydraulic control, work vehicle comprising the same and PTO torque estimation
US11155165B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2018 |
| Grant date | Oct 26, 2021 |
| Priority date | — |
| Expiry date | Jun 28, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2702/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A power-takeoff (PTO) unit for a work vehicle includes a planetary gear driven by an engine of the work vehicle; a PTO spline connected in power transmission to the planetary gear and defining a gear ratio; a hydrostatic transmission driven by the planetary gear to control the gear ratio; a pressure sensor unit for sensing a differential pressure across a loop of the hydrostatic transmission; and a control unit. The control unit is configured to calculate a differential pressure in the loop from a calibration mathematical model representing an unloaded functioning of the PTO spline. The control unit is also configured to calculate a PTO spline torque from a further mathematical model. The model is based on the pressure drop, on pressure signals from the sensor unit, and on kinematic or hydraulic factors of the planetary gear and the hydrostatic transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.