Piston for a hydraulic unit of a cam phaser and cam phaser

Patent metadata

Field	Value
Publication number	US-11028738-B2
Application number	US-201816202386-A
Country	US
Kind code	B2
Filing date	Nov 28, 2018
Priority date	Jul 27, 2016
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A piston for a hydraulic unit of a cam phaser, wherein the piston is configured cylindrical and wherein the piston is received axially movable in a cam phaser opening of the cam phaser, wherein according to a positioning of the piston a plurality of connections, in particular operating connections of the cam phaser are opened and closed, wherein the piston includes an outer contour that is configured for opening or closing the connections wherein the outer contour is configured complementary to an inner contour of the cam phaser opening in order to provide opening and/or closing of the connections. The invention also relates to a cam phaser.

First claim

What is claimed is:

1. A piston for a hydraulic unit of a cam phaser,
wherein the piston is configured cylindrical and wherein the piston is configured to move axially within a cam phaser opening of the cam phaser,
wherein a plurality of operating connections of the cam phaser are opened and closed according to a positioning of the piston,
wherein the piston includes an outer contour that is configured for opening or closing the plurality of operating connections wherein the outer contour is configured complementary to an inner contour of the cam phaser opening in order to provide opening or closing of the plurality of operating connections,
wherein the cam phaser opening is formed by an inner surface of a rotor of the cam phaser and the rotor including rotor blades is integrally formed from one piece of material, and
wherein the piston slides directly on the inner surface of the rotor.

2. The piston according to claim 1 ,
wherein the piston includes control edges which cause opening or closing of the plurality of operating connections for a corresponding positioning relative to flow control edges of the cam phaser opening.

3. The piston according to claim 1 , wherein the piston is secured by a terminal cover which partially envelops the piston.

4. The piston according to claim 3 , wherein the terminal cover is provided for providing a supply connection.

5. The piston according to claim 1 , wherein the piston includes a central channel.

6. The piston according to claim 1 , wherein flow through openings of the piston are supplied with hydraulic fluid through a central channel of the piston to supply the plurality of connections.

7. A cam phaser, comprising:
a rotor;
a stator; and
a piston that is received axially movable in a cam phaser opening of the cam phaser,
wherein different operating connections of a plurality of operating connections of the cam phaser are opened and closed corresponding to a positioning of the piston, and
wherein the piston and the rotor are configured according to claim 1 .

8. The cam phaser according to claim 7 , wherein a terminal cover of the piston is received in a hub of the cam phaser with a press fit.

9. The cam phaser according to claim 8 , wherein the hub is rotor hub of the rotor.

10. The cam phaser according to claim 7 ,
wherein the terminal cover is received in a receiving opening of the cam phaser, and
wherein a stop is formed by the receiving opening.

11. The cam phaser according to claim 7 , wherein an arrester element is configured to receive the piston in a secured and movable manner.

12. The cam phaser according to claim 11 , wherein the arrester element is fixed at the cam phaser by fastener elements.

13. The cam phaser according to claim 11 , wherein the arrester element includes an opening for receiving a piston pinion of the piston or the piston or an actuator plunger.

Assignees

• ECO Holding 1 GmbH

Inventors

• Sing Daniel
• Snyder John
• Stanhope Daniel

Classifications

• F01L2001/34433

  Location oil control valves · CPC title

• F16J1/09

  with means for guiding fluids (F16J1/08 takes precedence) · CPC title

• F01L1/3442 Primary

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title

• F01L2001/34426

  Oil control valves · CPC title