CONTROL VALVE FOR A CAMSHAFT ADJUSTER

• US 20150129066A1
• Filed: 03/08/2013
• Published: 05/14/2015
• Est. Priority Date: 05/25/2012
• Status: Active Grant

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Schaeffler Technologies GmbH & Co. KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Bayrakdar, Ali
• Granted Patent: US 9,879,793 B2
• Time in Patent Office: Days
• US Class Current: 137/614.2
• 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: F16K 15/1823 for ball check valves
• CPC Class Codes: Y10T 137/88054 Direct response normally closed valve limits direction of flow

Abstract

A control valve (4) for controlling pressure medium flows of a camshaft adjuster which includes a substantially hollow cylindrical valve housing (6), a control piston (12), which is guided axially displaceably inside the valve housing (6), and a non-return valve (22) which can be hydraulically released. In a region of a pressure medium inlet, the valve housing (6) includes a housing shaft (28) with an axial inflow bore (30) which widens in funnel-like manner towards the inlet side.

Claims

1. A control valve for controlling flows of pressurized medium of a camshaft adjuster, said control valve comprises an essentially hollow cylindrical valve housing, a guided control piston movable in an axial direction inside the valve housing, and a non-return valve that is releasable hydraulically, the valve housing has, in an area of a pressurized medium supply, a housing shaft with an axial supply hole that is widened in a funnel shape toward an inlet side.

2. The control valve according to claim 1, wherein the supply hole is widened in a funnel shape essentially in a region from the non-return valve up to the inlet side.

3. The control valve according to claim 1, wherein the housing shaft has a thread on an axial end thereof, a wall thickness of the housing shaft is decreased in an axial region between the non-return valve and the thread by a reduction of an outer diameter.

4. Control The control valve according to claim 1, wherein a filter element is arranged in the supply hole.