Vane-type cam phaser having increased rotational authority, intermediate position locking, and dedicated oil supply
US7421989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2005 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Nov 22, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2001/34469
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vane-type camshaft phaser having a rotational authority between 40 crank degrees before TDC and 30 crank degrees after TDC. The phaser includes a stator seat formed at a rotation position intermediate between full advance and full retard. A locking pin in a vane of the rotor engages the seat, locking the rotor at the intermediate position. The pin is disengaged by pressurized engine oil independent of oil flows for advance and retard of the rotor. The oil is controlled by a dedicated valve. Preferably, the seat and the ends of the locking pin are vented by passages in the rotor and stator which are aligned when the rotor is at the selected locking angle to remove oil resistance to entry of the pin into the seat. To position the locking pin over the seat, phasing rate is reduced to allow time for the locking pin to engage the seat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.