Pressurized oil reservoir for camshaft phaser
AssigneeSchaeffler Technologies AG & Co. KG
InventorAndrew Mlinaric
Life of this patent
Estimating the term…
Abstract
A camshaft phaser routes pressurized fluid from a set of chambers that are decreasing in volume to a reservoir. Oscillations of the rotor with respect to the stator create intervals in which the pressure in the reservoir exceeds the pressure in the set of chambers which are increasing in volume. During these intervals, fluid flows from the reservoir, through one-way valves, into the chambers which are increasing in volume. Pressurization of the reservoir increases the volume of flow through the one-way valves, decreasing the pump flow requirement for the camshaft phaser.
Claims13
A camshaft phaser comprising:
- a stator;
- a rotor fixed to a camshaft;
- first and second covers fixed to the stator;
- the stator, rotor, and first and second covers defining A-chambers and B-chambers wherein a volume ratio between the A-chambers and the B-chambers varies as a function of a rotational position of the rotor relative to the stator;
- a reservoir cover forming a fluid reservoir with the first cover, the reservoir cover fixed for rotation with the rotor and permitted to rotate relative to the stator, the fluid reservoir connected to the A-chambers and the B-chambers by one-way valves configured to permit flow from the fluid reservoir but not to the fluid reservoir;
- and
- a valve assembly configured to
- in a first position, direct pressurized fluid from a fluid source to both the A-chambers and the B-chambers,
- in a second position, direct pressurized fluid from the fluid source to the A-chambers and direct fluid from the B-chambers to the fluid reservoir at greater than atmospheric pressure, and
- in a third position, direct pressurized fluid from the fluid source to the B-chambers and direct fluid from the A-chambers to the fluid reservoir at greater than atmospheric pressure.
(canceled)
(canceled)
A camshaft phaser comprising:
- a stator;
- a rotor fixed to a camshaft;
- first and second covers fixed to the stator;
- the stator, rotor, and first and second covers defining A-chambers and B-chambers wherein a volume ratio between the A-chambers and the B-chambers varies as a function of a rotational position of the rotor relative to the stator;
- and
- a reservoir cover rotationally fixed to the rotor and forming a fluid reservoir with the first cover, the fluid reservoir connected to the A-chambers and the B-chambers by one-way valves configured to permit flow from the fluid reservoir but not to the fluid reservoir.
13-16. (canceled)
Dependencies are inferred from the claim text.