Power delivery system having a pressure modulated hydrodynamic retarder for controlling a load
US4324387A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1980 |
| Grant date | Apr 13, 1982 |
| Priority date | — |
| Expiry date | Jan 30, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66D5/026
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A pressure modulated hydrodynamic retarder is provided for a power delivery system and speed sensing means is provided for sensing the rotational speed of the output of the retarder for producing a corresponding pressure fluid flow which acts to vary the fluid relief pressure of a pressure control valve for the retarder and consequently varies the torque of the retarder in accordance with its rotor speed. In this manner the retarder is modulated as determined by its output speed and when the invention is used in a hoisting operation, as the lowering speed increases due to the falling load the retarding action of the retarder also increases. A particularly desirable form of sensing means includes a variable flow fluid pump which is driven at a speed proportional to the lowering speed of the load to proportionately vary the retarding ability of the retarder. The retarder system may include a one-way clutch between the retarder rotor and the power output shaft to provide for free-wheeling of the retarder when the shaft is rotated to raise the load, and which one-way clutch connects the rotor to the shaft when the shaft is rotating in the opposite direction to lower the load and this a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.