VCT lock pin having a tortuous path providing a hydraulic delay
US6647936B2 · kind B2 · utility
7Cited by
13References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 14, 2002 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Nov 14, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2250/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable cam timing phaser having a tortuous path from the supply of pressurized oil to the tapered recess into which the locking pin fits, that introduces a delay between when the engine starts and when the locking pin moves to an unlocked position. The tortuous path restricts fluid flow, preventing the locking pin from unlocking during engine start-up with the initial oil pressurization, prior to the variable cam timing phaser having sufficient oil to operate. The delay ensures that the chambers of the variable cam timing phaser have time to fill with operating fluid before the phaser is unlocked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.