Control valve for a device for variably adjusting the control times of gas-exchange valves of an internal combustion engine

• US 8,677,956 B2
• Filed: 11/19/2009
• Issued: 03/25/2014
• Est. Priority Date: 12/10/2008
• Status: Active Grant

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Chang, Chuck, Chen, Xuewei, Meyer, Roger
• Primary Examiner(s): Chang, Ching
• Application Number:
  US13/133,983
• Publication Number:
  US 20120060787A1
• Time in Patent Office: 1,587 Days
• Field of Search: 123/90.12, 123/90.15, 123/90.17, 137/522, 210/428
• US Class Current: 123/90.12
• CPC Class Codes: F01L 1/34 characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
• CPC Class Codes: F01L 1/344 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
• CPC Class Codes: F01L 1/3442 using hydraulic chambers with variable volume to transmit the rotating force
• CPC Class Codes: F01L 2001/34426 Oil control valves
• CPC Class Codes: F01L 2001/3444 Oil filters
• CPC Class Codes: Y10T 137/7876 With external means for opposing bias

Abstract

A control valve for a device for variably adjusting the control times of gas-exchange valves of an internal combustion engine. The control valve has a substantially hollow cylindrical valve housing, a non-return valve and an annular filter. The annular filter is arranged within the valve housing and the non-return valve has a closing body and a spring element.

Claims

1. A control valve for a device for variably adjusting control times of gas-exchange valves of an internal combustion engine, comprising:

a substantially hollow cylindrical valve housing;

a non-return valve arranged within the substantially hollow cylindrical valve housing having a closing body and a spring element; and

an annular filter arranged within the substantially hollow cylindrical valve housing,

wherein the closing body is arranged radially within the annular filter so as to be movable in an axial direction of the annular filter, and the annular filter has guide surfaces which serve to guide movement of the closing body in the axial direction.

2. The control valve as claimed in claim 1, wherein the annular filter has a valve seat for the closing body is formed on the annular filter.

3. The control valve as claimed in claim 1, wherein the annular filter has a frame with two annular sections and struts with the guide surfaces being formed on the struts and the struts connecting the annular sections to one another.

4. The control valve as claimed in claim 1, wherein the closing body is a ball, a cylinder or a conical section.

5. The control valve as claimed in claim 1, wherein the substantially hollow cylindrical valve housing has a cavity which is stepped such that a step of the cavity serves as an axial stop for the annular filter.

6. The control valve as claimed in claim 1, wherein the substantially hollow cylindrical valve housing has a cavity which is stepped such that a step of the cavity serves as valve seat for the closing body.

7. The control valve as claimed in claim 1, wherein the substantially hollow cylindrical valve housing has a cavity which is stepped such that a step of the cavity serves as an axial stop for the annular filter and as a valve seat for the closing body.