Central valve for a camshaft adjustment device
AssigneeSchaeffler Technologies AG & Co. KG
InventorsJens Hoppe, Markus Kinscher
Life of this patent
Estimating the term…
Abstract
A central valve for a camshaft adjuster, and to an internal combustion engine, which includes a camshaft, a camshaft-adjusting device, and a central valve. The central valve includes a shaped part as a valve housing (3), including a control piston (4) guided coaxially within the valve housing (3) in such a way that the control piston can move axially and including a stop, which limits the mobility of the control piston in an axial direction (piston stop). The piston stop is a piston stop washer (5), wherein the piston stop washer and the valve housing (3) are joined.
Claims12
A central valve for a camshaft adjustment device, the central valve comprising:
- a shaped part valve housing;
- a control piston coaxially and axially movably guided within the valve housing;
- and
- a piston stop that limits a movability of the control piston in an axial direction, the piston stop being a piston stop washer, the piston stop washer and the valve housing being joined,
- the valve housing having at least one notch in a stop area of the piston stop washer, the piston stop washer having at least one radial expansion adapted to the at least one notch, the piston stop washer and the valve housing via of the at least one radial expansion being permanently non-detachably joined in a notch area of the at least one notch, the piston stop washer in a radial expansion area of the at least one radial expansion having a larger radius than the valve housing,
- wherein the at least one radial expansion includes a first radial expansion and a second radial expansion, the first radial expansion extending further radially outward from a center of the piston stop washer than the second radial expansion.
An internal combustion engine comprising:
- a camshaft;
- a camshaft adjustment device;
- and
- a central valve for the camshaft adjustment device, the central valve comprising:
- a shaped part valve housing;
- a control piston coaxially and axially movably guided within the valve housing;
- and
- a piston stop that limits a movability of the control piston in an axial direction, the piston stop being a piston stop washer, the piston stop washer and the valve housing being joined,
- the valve housing having at least one notch in a stop area of the piston stop washer, the piston stop washer having at least one radial expansion adapted to the at least one notch, the piston stop washer and the valve housing with an aid via of the at least one radial expansion being permanently non-detachably joined in a notch area of the at least one notch, the piston stop washer in a radial expansion area of the at least one radial expansion having a larger radius than the valve housing,
- wherein the at least one radial expansion includes a first radial expansion and a second radial expansion, the first radial expansion extending further radially outward from a center of the piston stop washer than the second radial expansion,
- the valve housing being concentrically situated in a borehole of the camshaft, and the valve housing having a radial passage, as a supply connection, axially situated in a passage area of a corresponding radial passage in the camshaft.
A central valve for a camshaft adjustment device, the central valve comprising:
- a shaped part valve housing;
- a control piston coaxially and axially movably guided within the valve housing;
- and
- a piston stop that limits a movability of the control piston in an axial direction, the piston stop being a piston stop washer, the piston stop washer and the valve housing being joined,
- the valve housing having at least one notch in a stop area of the piston stop washer, the piston stop washer having at least one radial expansion adapted to the at least one notch, the piston stop washer and the valve housing via of the at least one radial expansion being permanently non-detachably joined in a notch area of the at least one notch, the piston stop washer in a radial expansion area of the at least one radial expansion having a larger radius than the valve housing,
- wherein the piston stop washer has at least one arcuate outer circumferential surface section past which the at least one radial expansion protrudes radially, the at least one arcuate outer circumferential surface section being circumferentially wider than the at least one radial expansion.
Dependencies are inferred from the claim text.