Patent · US Expired

Arrangement for changing the valve timing of an internal-combustion engine

US5138985A · kind A · utility

24Cited by

1References

16Claims

0Family size

Assignee

Dr. Ing. h.c. F. Porsche AG · DE

Inventors

Imre Szodfridt · Stuttgart, DE
Willi Schultz · Pforzheim, DE
Herbert Ampferer · Sachsenheim, DE

Key dates

Filing date	Jul 25, 1991
Grant date	Aug 18, 1992
Priority date	—
Expiry date	Jul 25, 2011

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B2275/18
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

An arrangement for changing the valve timing of an internal-combustion engine has a camshaft, which can be rotated relative to a shaft driving it. The camshaft has a phase converter with a piston which is hydraulically acted upon on both sides. In the camshaft, an axial recess is arranged in which an inserted pipe separates two spaces from one another. An on/off valve fed from the oil circulating system, in one position, via one of the spaces, supplies the piston with pressure oil so that this piston is axially shifted into a first end position and in the process rotates the camshaft. In a second position, the piston, by way of the second space is axially pushed back by pressure oil.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.