Sealed camshaft phase change device
US4841924A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1988 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Aug 18, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1956
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A device (10) for varying the angular phase relation between a camshaft (12) and a crankshaft (unshown) in response to axial displacement of an advancing plate (20) drivingly connected to a support (16) via straight splines (16f) and a drive (18) via angled splines (18d). The support (16) is fixed to an end (12a) of the camshaft (12) for rotation therewith. The drive (18) is journaled on the support (16) and is driven by and in phase with the crankshaft. The advancing plate (20) is also threadably connected to a drum (36) via threads (20c,36a) and the axial displacement is effected by relative rotation between the plate (20) and the drum (36). A clockspring (24) reacting between the support (16) and drum (36) tends to rotate the drum (36) faster than the plate (20) for positioning the plate (20) in a first limit position. The plate ( 20) is selectively movable from the first position toward a second limit position in response to selective application of a frictional retarding force to the drum by an actuation assembly (30). Intermediate plate positions (and of course intermediate phase relations of the camshaft (12) and crankshaft) are provided by balancing the spring and retarding…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.