Hydraulically actuated marine transmission
US7997398B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2008 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Feb 28, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D25/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A marine transmission provides a cylindrical spool valve that is disposed within the gear case of the transmission and has a movable portion that is axially movable in a vertical direction to select forward, neutral, and reverse gear positions of the transmission. A piston assembly provides a primary piston and two auxiliary pistons which cooperate with each other to provide appropriate hydraulic forces which move a dog clutch into engagement with forward or reverse gears or toward a location in non-engagement with neither the forward nor reverse gears. The spool valve is generally cylindrical and disposed within a narrow column portion of the gear case of a marine propulsion system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.