Cam shaft adjuster and method for adjusting the angle-of-rotation position of a cam shaft relative to a crankshaft
AssigneeSchaeffler Technologies AG & Co. KG
InventorsDirk Heintzen, Matthias Friedrichs
Life of this patent
Estimating the term…
Abstract
a cam adjuster for adjusting the angle-of-rotation positions of a cam shaft relative to a crankshaft. The cam shaft adjuster has at least two operating chambers to which pressure oil can be supplied to change the angle-of-rotation position. At least one of the operating chambers can be deactivated depending on an operating parameter by blocking the pressure oil supply.
Claims10
A camshaft adjuster for adjusting an angle-of-rotation position of a camshaft relative to a crankshaft, comprising:
- at least two working chambers to which pressure oil can be supplied to change the angle-of-rotation position the at least two working chambers including a first working chamber and a second working chamber, and
- at least one cut-off mechanism configured to cut-off the first working chamber when a pressure of the pressure oil exceeds a first predetermined value by the supply of pressure oil being blocked and configured to cut-off the second working chamber when a pressure of the pressure oil exceed a second predetermined value greater than the first predetermined by the supply of pressure oil being blocked.
A camshaft adjuster for adjusting an angle-of-rotation position of a camshaft relative to a crankshaft, comprising:
- at lest two working chambers to which pressure oil can be supplied to change the angle-of-rotation position,
- wherein at least one of the working chambers can be cut-off depending on an operating parameter by the supply of pressure oil being blocked,
- a locking mechanism, which can block the angel-of-rotation position, and the supply of pressure oil, and
- a first spring and a second spring, wherein, at a first oil pressure, the locking mechanism release the supply of pressure oil counter to a force of the first spring and, at a second, hight oil pressure, the locking mechanism blocks the supply of pressure oil counter to the force of the second spring.
A method for adjusting an angle-of-rotation position of a camshaft relative to a crankshaft, the method comprising the step of:
- supplying at least two working chambers of a camshaft adjuster with pressure oil to change the angle-of-rotation position, the at least two working chambers including a first working chamber and a second working chamber;
- blocking the supply of pressure oil to the first working chamber when a first predetermined pressure of the pressure oil is exceeded, while the supply of pressure oil to at least one of the remaining working chambers remains open;
- and
- blocking the supply of pressure oil to the second working chamber when a second predetermined pressure of the pressure oil greater than the first predetermined pressure is exceeded.
Dependencies are inferred from the claim text.