Cam phaser with electromagnetically actuated hydraulic valve

US9631525B2 · kind B2 · utility

Assignee

• Hilite Germany GmbH · DE

Inventors

• Michael Oppel · Brück, DE
• Matthias Lang · Berching, DE
• Marc Hohmann · Marktheidenfeld, DE

Key dates

• Filing date: Apr 26, 2015
• Grant date: Apr 25, 2017
• Expiry date: May 1, 2035

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2001/34483
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A cam phaser including an electromagnetically actuated hydraulic valve; and a hollow piston inserted in a borehole and longitudinally movable by an electromagnet so that a hydraulic fluid is distributed to operating connections associated with pressure cavities of the cam phaser, wherein a first operating connection branches off from a borehole directly adjacent to the electromagnet, wherein the hollow piston includes a circumferential bar with a control edge oriented towards the electromagnet so that a cavity within the borehole is defined on one side by the circumferential bar and on another side by the electromagnet, wherein a drain opening extends from the cavity, wherein the drain opening hydraulically connects the cavity with a drain channel leading towards a tank drain, wherein the bar is movable into a direction expanding the first operating connection in the flow cross section by a force of the electromagnet that is loaded with electrical current.