Internal combustion engine with variable compression ratio and compression ratio control method
US7036468B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 2004 |
| Grant date | May 2, 2006 |
| Priority date | — |
| Expiry date | Apr 5, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D15/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable compression ratio engine has a compression ratio varying mechanism, which moves a cylinder block relative to a lower case. The rotational driving force of a servo motor is transmitted to vertical sliding movements of the cylinder block by means of cam shafts with eccentric cams. First and second rows of spring members and are arranged on both sides of the cylinder block. The resultant spring force of the first and second spring members is applied to the cylinder block and the lower case. The resultant spring force works to reduce the transmission torque of the rotational driving force of the servo motor and assist the compression ratio varying mechanism to vary a compression ratio of the engine. The technique simplifies the control procedure of varying the compression ratio of the engine and reduces the size of the mechanism required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.