Patent · US Active

Hydraulically actuated camshaft adjusting device

US8733308B2 · kind B2 · utility

6Cited by

1References

10Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Steffen Racklebe · Herzogenaurach, DE
Jochen Auchter · Weisendorf, DE
Jochen Broz · Weisendorf, DE

Key dates

Filing date	May 19, 2011
Grant date	May 27, 2014
Priority date	—
Expiry date	May 19, 2031

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF01L2001/34446
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A camshaft adjusting device (1) including at least two hydraulic chamber (A, B) disposed between a stator (3) and a rotor (4) and separated by a vane (5) and supplied with pressure oil from a pressure oil source (P) by a hydraulic oil controller (6). In order to achieve improved filling and emptying of the hydraulic chambers, the hydraulic oil controller according to the invention provides: first and second supply lines (7, 9) disposed between the pressure oil source (P) and one of the hydraulic chambers (A), wherein check valves (8, 10) are disposed in the supply lines (7), wherein the supply lines (7) are free of further switchable valve elements, and wherein the supply lines (7) are the sole inlet line for hydraulic oil from the pressurized oil source (P) into the hydraulic chambers (A, B), and a 4/3-way valve element (11) that is effectively disposed between the hydraulic chambers (A, B) and a tank (T) has three valve positions (I, II, III).

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