Hydraulic phasers and valve means therefor
US5119691A · kind A · utility
18Cited by
21References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1990 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Jul 27, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2102
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable camshaft phaser (VCP) has various embodiments and features including inner and outer helical splines for phase changing and return springs mounted in pockets to shorten overall length and relieve lash take-up friction on the piston return strokes. A three-way feed-discharge valve limits hydraulic actuating oil flow to that required to operate the drive pistons for phase changing operation. The three-way valve may be carried in a srew or fastener that secures the phaser to a camshaft or other rotary member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.