Overload protection control circuit for marine engines
US4239454A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 24, 1978 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Aug 24, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H3/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An overload protection control circuit for marine engines, in which a propeller pitch control signal, as initiated by the operator and transmitted to a servo-positioner for setting the propeller pitch, is modified by a speed control signal, also initiated by the operator, for setting the speed of the ship through a speed governor device, so that the pitch of the propeller is automatically maintained at a degree compatible with the ship speed. According to the invention, an overload limiting valve device is interposed in the protection control circuit and is preset to respond to a critical engine load condition to effect operation of the servo-positioner to a neutral position in which propeller pitch is reduced to a safe degree.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.