US 12,234,754 B2 · Camshaft adjuster with reset function

Abstract

The invention relates to a hydraulic camshaft adjuster (1) having a stator (2), a rotor (3) rotatable relative to the stator (2) within a limited angular range, and a hydraulic supply (4) having two working channels (5, 6) and a shifting valve (7), wherein the two working channels (5, 6) for adjusting the rotor (3) relative to the stator (2) in two opposite directions of action can be connected to a pump (10) for pressurisation or to a reservoir (11) for pressure relief, depending on the shifting position (8, 9) of the shifting valve (7), wherein the hydraulic supply (4) has a return pump (12) that can be actuated by displacing the shifting valve (7) between its shifting positions (8, 9) and by the actuation of which one of the two work-ing channels (6) can be pressurised for returning the rotor (3) into a predetermined position.

Claims20

Dependent claims

A hydraulic camshaft adjuster for adjusting a phase position of a camshaft relative to a crankshaft in a motor vehicle drive train, the hydraulic camshaft adjuster comprising:

a stator,
a rotor configured to rotate relative to the stator within a predetermined angular range, and
a hydraulic supply system configured to control the relative rotation of the rotor, the hydraulic supply system including:
a first working channel,
a second working channel,
a first switching valve configured to switch between (i) a first switching position in which the first working channel and the second working channel are respectively connected to a pressurizing pump and a pressure relieving reservoir, and (ii) a second switching position in which the second working channel and the first working channel are respectively connected to the pressurizing pump and the reservoir, and
a return pump actuated via a switching movement of the first switching valve, the return pump configured to pressurize one working channel of the first and second working channels so as to return the rotor to a predetermined rotational position relative to the stator.

4 more elements

A method of adjusting a phase position of a camshaft relative to a crankshaft in a motor vehicle drive train, the method comprising:

providing a hydraulic camshaft adjuster including:
a stator,
a rotor configured to rotate relative to the stator within a predetermined angular range, and
a hydraulic supply system configured to control the relative rotation of the rotor, the hydraulic supply system including:
a first working channel,
a second working channel,
a first switching valve configured to switch between (i) a first switching position in which the first working channel and the second working channel are respectively connected to a pressurizing pump and a pressure relieving reservoir, and (ii) a second switching position in which the second working channel and the first working channel are respectively connected to the pressurizing pump and the reservoir, and
a return pump actuated via a switching movement of the first switching valve, the return pump configured to pressurize one working channel of the first and second working channels so as to return the rotor to a predetermined rotational position relative to the stator;
and
selectively switching the first switching valve between the first and second switching positions.

7 more elements

Dependencies are inferred from the claim text.

Camshaft adjuster with reset function

Life of this patent

Camshaft adjuster with reset function

Life of this patent

Abstract

Claims20