Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2005-11-25
2010-11-30
Rivell, John (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C137S625670, C137S625680, C251S368000
Reexamination Certificate
active
07841361
ABSTRACT:
An electromagnetic hydraulic valve (1), in particular proportional valve, for controlling a device for the rotational angle adjustment of a camshaft relative to a crankshaft of an internal combustion engine, composed of an electromagnet (2) with a hollow-cylindrical magnet housing (4), at least one coil winding (5), an axially moveable magnet armature (6), a first and a second pole shoe (7, 8), a valve part (3) with a hollow-cylindrical valve housing (9) having a control piston (12) which can be moved axially by the magnet armature (6) of the electromagnet (2) via a plunger rod (11). The invention consists of a sleeve (17), composed of a base (18) and a hollow-cylindrical side wall (19), which is arranged on that end of the control piston (12) and situated in the direction of the plunger rod (11), where the sleeve (17) has a greater hardness than the control piston (12).
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Lucas & Mercanti LLP
Price Craig
Rivell John
Schaeffler KG
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