Hydraulic valve for a cam phaser

A hydraulic valve for a cam phaser, the hydraulic valve comprising:

• a bushing including a piston that is movable in a bore along a longitudinal direction between a first end position and a second end position;
• a supply connection for feeding a hydraulic fluid;
• a first operating connection and a second operating connection;
• and
• a first tank drain connection and a second tank drain connection configured to drain the hydraulic fluid,
• wherein the first operating connection and the second operating connection are in fluid communication with each other by positioning of the piston, and
• wherein the piston includes two outer annular bars that are arranged at axially exterior ends of the piston and configured to completely close the second tank drain connection in the first end position and to completely close the first tank drain connection in the second end position,
• wherein an entirety of a first outer annular bar of the two outer annular bars is arranged in the longitudinal direction between the first operating connection and the first tank drain connection when the first outer annular bar completely closes the first tank drain connection in the second end position,
• wherein an entirety of a second outer annular bar of the two outer annular bars is arranged in the longitudinal direction between the second operating connection and the second tank drain connection when the second outer annular bar completely closes the second tank drain connection in the first end position, and
• wherein groove shaped recesses are arranged in the longitudinal direction respectively between the first operating connection and the associated first tank drain connection and between the second operating connection and the associated second tank drain connection
• wherein an entirety of a first groove shaped recess of the groove shaped recesses is arranged in the longitudinal direction between the first operating connection and the first tank drain connection,
• wherein an entirety of a second groove shaped recess of the groove shaped recesses is arranged in the longitudinal direction between the second operating connection and the second tank drain connection,
• wherein the entirety of the first outer annular bar is arranged in the longitudinal direction between the first groove shaped recess and the first tank drain connection when the first outer annular bar completely closes the first tank drain connection in the second end position,
• wherein the entirety of the second outer annular bar is arranged in the longitudinal direction between the second groove shaped recess and the second tank drain connection when the second outer annular bar completely closes the second tank drain connection in the first end position.

A hydraulic valve for a cam phaser, the hydraulic valve comprising:

• a bushing including a piston that is movable in a bore along a longitudinal direction between a first end position and a second end position;
• a supply connection for feeding a hydraulic fluid;
• a first operating connection and a second operating connection;
• and
• a first tank drain connection and a second tank drain connection configured to drain the hydraulic fluid,
• wherein the first operating connection and the second operating connection are in fluid communication with each other by positioning of the piston, and
• wherein the piston includes two outer annular bars that are arranged at axially exterior ends of the piston and configured to completely close the second tank drain connection in the first end position and to completely close the first tank drain connection in the second end position,
• wherein groove shaped recesses are arranged in the longitudinal direction respectively between the first operating connection and the associated first tank drain connection and between the second operating connection and the associated second tank drain connection,
• wherein the piston includes two inner annular bars between the two outer annular bars,
• wherein the two inner annular bars are respectively associated with the first operating connection and the second operating connection, and
• wherein the piston is movable into a second position where the first tank drain connection and the second tank drain connection are closed by the two outer annular bars and the first operating connection and the second operating connection are respectively closed by the two inner annular bars.