Device for varying valve timing of gas exchange valves of an internal combustion engine, in particular a hydraulic camshaft adjusting device of a rotary piston type
US6418893B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2000 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Oct 25, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2001/34479
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a hydraulic camshaft adjusting device (1) of a rotary piston type that is disposed on a camshaft (3) mounted in the cylinder head (2) of an internal combustion engine and comprises a drive pinion (4) that is in driving relation with a crankshaft through a gearing (6), and a winged wheel (5) that is fixedly mounted on the camshaft (3). The drive pinion (4) is made up of a circumferential wall (7), a camshaft-distal side wall (8) and a camshaft-proximate side wall (9), which walls (7, 8, 9) together define a hollow space (10) in which at least one hydraulic working chamber is formed by at least two limiting walls (11). The winged wheel (5) comprises at least one wing (14), and each wing (14) divides a hydraulic working chamber into two hydraulic pressure chambers. In accordance with the invention, the camshaft-proximate side wall (9) of the drive pinion (4) is configured as a weight- and design space-saving thin-walled component which is shaped out of a circular blank and comprises a bent edge region (17) that is bent at a right angle and partially surrounds the circumferential wall (7) of the drive pinion (4), said camshaft-proximate side wall (9) being unde…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.