Control valve for cam phaser and method for mounting the control valve

A control valve for a cam phaser of an internal combustion engine, the control valve comprising:

• a cylindrical housing, including a first operating connection, a second operating connection, a supply connection, and a tank drain connection configured to drain a hydraulic fluid;
• a control piston device including a control piston, a piston shaft, a first check valve, and a second check valve, wherein the control piston device is arranged in the housing and movable by an actuator in an axial direction of the housing,
• wherein the first check valve is configured with a first piston disc and the second check valve is configured with a second piston disc and the first piston disc and the second piston disc are arranged offset from each other by a compression spring so that a control chamber is formed between the first piston disc and the second piston disc,
• wherein the first piston disc and the second piston disc are respectively configured with at least two support elements,
• wherein the at least two support elements extend in the axial direction from a side of the first piston disc and the second piston disc that is respectively oriented away from the control chamber, and
• wherein the at least two support elements support a linear movement of the first piston disc and the second piston disc in the control piston,
• wherein the control piston device is configured movable into a first position, a second position, and a third position,
• wherein the first operating connection is closed by the first piston disc for a fluid from the control chamber in the first position, wherein a flow of the fluid from the first operating connection into the control chamber and to the second operating connection is enabled by a check function of the first check valve,
• wherein the first operating connection and the second operating connection are closed in the second position, and
• wherein the second operating connection is closed by the second piston disc for a hydraulic fluid from the control chamber in the third position, wherein a flow of the hydraulic fluid from the second operating connection into the control chamber and to the first operating connection is enabled by a check function of the second check valve, wherein the piston shaft includes at least one inlet opening to the control chamber, and wherein the at least one inlet opening is arranged so that the hydraulic fluid is feedable to the control chamber centrally and symmetrically between the first check valve and the second check valve.

A control valve for a cam phaser of an internal combustion engine, the control valve comprising:

• a cylindrical housing, including a first operating connection, a second operating connection, a supply connection, and a tank drain connection configured to drain a hydraulic fluid;
• a control piston device, including a control piston, a piston shaft, a first check valve, and a second check valve, wherein the control piston device is arranged in the housing and movable by an actuator in an axial direction of the housing,
• wherein the first check valve is configured with a first piston disc and the second check valve is configured with a second piston disc and the first piston disc and the second piston disc are arranged offset from each other by a compression spring so that a control chamber is formed between the first piston disc and the second piston disc,
• wherein the first piston disc and the second piston disc are respectively configured with at least two support elements,
• wherein the at least two support elements extend in the axial direction from a side of the first piston disc and the second piston disc that is respectively oriented away from the control chamber,
• wherein the at least two support elements support a linear movement of the first piston disc and the second piston disc in the control piston, and
• wherein the first check valve and the second check valve are axially arranged in the control piston and have opposite opening directions, wherein the piston shaft includes at least one inlet opening to the control chamber, and wherein the at least one inlet opening is arranged so that the hydraulic fluid is feedable to the control chamber centrally and symmetrically between the first check valve and the second check valve.