Compression ratio changing device using an eccentric bearing for an internal combustion engine
US4721073A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1986 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Jul 30, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C23/10
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A compression ratio changing device for an internal combustion engine using an eccentric bearing interposed between a piston-pin and a connecting rod. A lock hole is formed in the eccentric bearing and a lock-pin hole is formed in the connecting rod. A lock-pin is slidably inserted in the lock-pin hole and can move into or out of the lock hole. When the lock-pin engages lock hole, the rotation of the eccentric bearing is locked. When the lock-pin moves apart from the lock hole, the rotation of the eccentric bearing becomes free. To obtain a smooth entry of the lock-pin into the lock hole, a guide groove is formed in the outer portion of the eccentric bearing. A portion of the surface of the lock hole forms a colliding surface for colliding with the lock-pin. A deformation absorbing groove is formed at the outer portion of the colliding surface. The deformation absorbing groove absorbs a deformation of the eccentric bearing which may occur when the lock-pin is insufficiently driven toward the lock hole and the load of collision is large. Such a deformation absorbing groove increases the reliability of the operation of the compression ratio changing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.