Control valve for a camshaft adjuster

• US 9,458,942 B2
• Filed: 03/08/2013
• Issued: 10/04/2016
• 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 AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Bayrakdar, Ali
• Primary Examiner(s): Fristoe, Jr., John K
• Assistant Examiner(s): ROHMAN, KELSEY E.
• Application Number:
  US14/402,561
• Publication Number:
  US 20150129069A1
• Time in Patent Office: 1,306 Days
• Field of Search: 137/625.68, 137/625.2, 137/625.69, 137/625.65, 137/625.66, 137/625.67, 123/90.17, 403/93, 403/193
• US Class Current: 1/1
• 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 2001/0475 Hollow camshafts
• CPC Class Codes: F01L 2001/0476 Camshaft bearings
• CPC Class Codes: F01L 2001/34423 Details relating to the hydraulic feeding circuit
• CPC Class Codes: F01L 2001/34426 Oil control valves
• CPC Class Codes: F01L 2001/3443 Solenoid driven oil control valves
• CPC Class Codes: F01L 2001/34433 Location oil control valves
• CPC Class Codes: F01L 2001/34453 Locking means between driving and driven members
• CPC Class Codes: F01L 5/14 characterised by the provision of valves with reciprocating and other movements surrounding working cylinder or piston F01L5/06
• CPC Class Codes: F16K 11/0712 comprising particular spool-valve sealing means
• CPC Class Codes: F16K 11/0716 with fluid passages through the valve member F16K11/0704, F16K11/0708, F16K11/0712 take precedence
• CPC Class Codes: F16K 15/1823 for ball check valves
• CPC Class Codes: F16K 27/048 Electromagnetically actuated valves
• CPC Class Codes: F16K 31/0613 with cylindrical slides
• CPC Class Codes: Y10T 137/86574 Supply and exhaust
• CPC Class Codes: Y10T 137/86622 Motor-operated
• CPC Class Codes: Y10T 137/8663 Fluid motor
• CPC Class Codes: Y10T 137/86694 Piston valve
• CPC Class Codes: Y10T 137/86702 With internal flow passage
• CPC Class Codes: Y10T 137/8671 : With annular passage [e.g., spool]
• CPC Class Codes: Y10T 137/86775 : With internal passage
• CPC Class Codes: Y10T 137/87169 : Supply and exhaust

Abstract

A control valve (4) for controlling pressure medium flows of a camshaft adjuster, which control valve includes a substantially hollow cylindrical control sleeve (6), which is disposed inside a casing (8), and a control piston (12) which is guided axially displaceably inside the control sleeve (6) against the spring force of a spring element (14), the control sleeve (6) having at one axial end a base (22) which serves as an axial contact surface for the spring element (14).

Claims

1. A control valve for controlling flows of pressurized medium of a camshaft adjuster, said control valve comprises an essentially hollow cylindrical control sleeve arranged inside a casing and a guided control piston that is movable in an axial direction inside the control sleeve against a spring force of a spring element, the control sleeve has, on an axial end, a base that is an axial contact surface for the spring element, the base comprises a recess through which a projection of the casing passes in the axial direction in a positive locking connection, and the projection extends through the base of the control sleeve.

2. The control valve according to claim 1, wherein the recess is formed with a multiple-fold, cyclic rotational symmetry.