Variable camshaft timing system with pin-style lock between relatively oscillatable components
US6481402B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2001 |
| Grant date | Nov 19, 2002 |
| Priority date | — |
| Expiry date | Jul 11, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2102
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable camshaft timing phaser (10; 110; 210) in which a rotor (12; 112;212) that is secured to a rotatable camshaft is selectively advanced or retarded in position relative to a surrounding rotatable housing (14; 114, 214), the rotor having at least one outwardly extending vane (20; 120; 220) that is received in an inwardly facing recess (18; 118; 218). Pressurized oil is selectively delivered to one of an advance portion or a retard portion of the recess, and simultaneously withdrawn from the other of the advance portion and the retard portion, by adjusting the axial position of an axially shiftable spool valve (22; 122; 222). The spool valve has a null position, and the relative positions of the rotor and the housing are positively locked in position when the spool valve is in its null position by a locking pin (48; 148; 248). The locking pin is resiliently biased towards a locking position by a spring (52; 152; 252), and is urged away from its locking position by pressurized oil from a source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.