Control for a fluid-driven fan
US4487255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1981 |
| Grant date | Dec 11, 1984 |
| Priority date | — |
| Expiry date | Dec 17, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01P7/044
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fan drive system (10) controls the start-up of a fluid driven fan motor (16) in response to an engine being started. Since the fan motor (16) is many times located remote from the engine, it is important to start the fan motor (16) turning simultaneously when the engine is started. A control mechanism (32) changes the displacement of a pump (12) to operate at an operative position for a predetermined time period from initial start-up to ensure that the motor (16) starts to turn the fan (22). The control mechanism (32) automatically reduces the pump displacement to a standby position at the expiration of the predetermined time period to conserve energy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.