Marine drive trim cylinder with two stage damping system
US6830492B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2003 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Aug 29, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H20/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A two stage damping system is provided for a trim cylinder mount of a marine drive unit. The mounting bushings comprise inner and outer tubes with an elastomeric material disposed between the inner and outer tubes. The elastomeric material is structured to provide a soft rate of stiffness in response to relatively light loads, such as shifting loads, and a harder rate of stiffness in response to higher loads, such as during high thrust loads or wide open throttle operation of a marine vessel. The two rates of stiffness are provided by the appropriate placement of cavities either within the elastomeric material or between the elastomeric material and the inner or outer tubes. Alternatively, two different types of elastomeric material can be used to provide the two rates of stiffness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.