Camshaft adjuster
AssigneeSchaeffler Technologies AG & Co. KG
InventorBranimir Karic
Life of this patent
Estimating the term…
Abstract
The disclosure relates to a vane type camshaft adjuster for a motor vehicle drive train. The camshaft adjuster having a stator, a rotor arranged such that it can rotate relative to the stator, working chambers formed between the stator and the rotor, each working chamber being divided into two sub-chambers by a radially projecting blade of the rotor, and a reservoir connected to the sub-chambers for storing hydraulic medium. The sub-chambers can be connected to a pump or a tank according to a switch position of a control valve of the camshaft adjuster. The control valve has a switch position in which a first sub-chamber of the two sub-chambers is connected to the tank and a second sub-chamber of the two sub-chambers is blocked from the pump.
Claims20
A vane type camshaft adjuster configured for a motor vehicle drive train, the vane type camshaft adjuster comprising:
- a stator,
- a rotor arranged to rotate relative to the stator,
- working chambers formed between the stator and the rotor, each working chamber divided into two sub-chambers by a radially projecting blade of the rotor, and
- a reservoir connected to the two sub-chambers, the reservoir configured for storing hydraulic medium so that hydraulic medium can be supplied from the reservoir to any one of the two sub-chambers when a negative pressure is present in the any one of the two sub-chambers to adjust the rotor relative to the stator, and
- the two sub-chambers are configured to be connected to either a pump or a tank according to a switch position of a control valve of the camshaft adjuster, and
- in a first additional switch position of the control valve, a first sub-chamber of the two sub-chambers is configured to drain to the tank and a second sub-chamber of the two sub-chambers is disconnected from the pump.
A vane type camshaft adjuster configured for a motor vehicle drive train, the vane type camshaft adjuster comprising:
- a stator,
- a rotor arranged to rotate relative to the stator,
- working chambers formed between the stator and the rotor, each working chamber divided into a first sub-chamber and a second sub-chamber by a radially projecting blade of the rotor,
- a reservoir connected to the first and second sub-chambers, the reservoir configured to store hydraulic medium so that hydraulic medium can be supplied from the reservoir to one of the first or second sub-chambers when a negative pressure is present in the one of the first or second sub-chambers to adjust the rotor relative to the stator, and
- a control valve having a piston configured to be displaceable to five switch positions, and
- in a first switch position of the control valve:
- the first sub-chamber is configured to be connected to a tank, and
- the second sub-chamber is configured to be connected to a pump, and
- in a second switch position of the control valve:
- the first sub-chamber is configured to be connected to the tank, and
- the second sub-chamber is configured to be blocked from the pump, and
- in a third switch position of the control valve,
- the first sub-chamber is configured to be connected to the pump, and
- the second sub-chamber is configured to be connected to the pump, and
- in a fourth switch position of the control valve,
- the first sub-chamber is configured to be blocked from the pump, and
- the second sub-chamber is configured to be connected to the tank, and
- in a fifth switch position of the control valve,
- the first sub-chamber is configured to be connected to the pump, and
- the second sub-chamber is configured to be connected to the tank.
A vane type camshaft adjuster configured for a motor vehicle drive train, the vane type camshaft adjuster comprising:
- a stator,
- a rotor arranged to rotate relative to the stator,
- working chambers formed between the stator and the rotor, each working chamber divided into a first sub-chamber and a second sub-chamber by a radially projecting blade of the rotor,
- a reservoir connected to the first and second sub-chambers, the reservoir configured to store hydraulic medium so that hydraulic medium can be supplied from the reservoir to one of the first or second sub-chambers when a negative pressure is present in the one of the first or second sub-chambers to adjust the rotor relative to the stator, and
- a control valve having a piston configured to be displaceable to five switch positions, and
- in three switch positions, at least one of the first or second sub-chambers is configured to be connected to a pump, and
- in two switch positions, at least one of the first or second sub-chambers is configured to be disconnected from the pump and a remaining one of the first or second sub-chambers is configured to be connected to a tank.
Dependencies are inferred from the claim text.