Schaeffler Technologies Ag & Co .kg

Jurgen Plate

Jens Schafer

Martin Steigerwald

Michael Busse

Olaf Boese

Steffen Racklebe

Andreas Wedel

Jochen Auchter

Robert Heinemann

Lutz Witthöft

A camshaft adjuster () with a stator () that has an outer part () for concentrically holding a rotor () with vanes () arranged around the rotor () and a segment () projecting from the outer part () for engaging between two vanes () of the rotor (), in order to form, together with the two vanes (), pressure chambers () of the camshaft adjuster (). A cover () is located on an axial side of the ring-shaped outer part, and the cover includes a cavity for holding hydraulic fluid from the pressure chambers (). The segment () may also have a cavity () for holding a hydraulic fluid from the pressure chambers ().

Arrangement of a volume accumulator in a camshaft adjuster

A stator () for a camshaft adjuster (). The stator () has an outer part () for concentrically holding a rotor () with vanes () arranged around the rotor () and a segment () projecting from the outer part () for engaging between two vanes () of the rotor (), in order to form, together with the two vanes (), pressure chambers () of the camshaft adjuster (). Here, the segment () has a cavity () for holding a hydraulic fluid from the pressure chambers ().

Arrangement of a volume accumulator

A directional valve () for controlling a hydraulic oil flow from a pressure port () via working chambers of a camshaft adjuster () to a tank port (). The directional valve () includes an accumulator port () for conducting at least a part of the hydraulic oil flowing out of a working chamber into a volume accumulator () before said hydraulic oil flows out into the tank port (), and the accumulator port () is connected via a passage () to the pressure port ().

Filling of a volume accumulator in a camshaft adjuster

A directional control valve () for controlling a flow of hydraulic oil from a pressure connection () via work chambers of a camshaft adjuster () to a tank connection (). The disclosed directional control valve () includes an accumulator connection () for guiding at least a part of the hydraulic oil flowing out from a work chamber into a volume accumulator () before the discharge into the tank connection ().

Construction of a hydraulic oil channel between a central valve and a volume accumulator of a camshaft adjuster

A camshaft adjuster () including a stator () and a rotor () which is received in the stator () and which can be rotated relative to the stator () by a pressure chamber (), a pressure interface () for supplying hydraulic liquid to the pressure chamber (), and an outflow interface () for the discharge of the hydraulic liquid from the pressure chamber (). The camshaft adjuster () also has a third interface () for filling the pressure chamber () with hydraulic liquid from a volume accumulator ().

External volume accumulator configuration in a camshaft adjuster

A camshaft adjustor (), for an internal combustion engine (), the camshaft adjustor having a stator (), a rotor () which is rotatably accommodated in the stator (), a pressure chamber () for adjusting the rotor () in relation to the stator () and a volume reservoir () for equalizing a negative pressure in the pressure chamber () via a channel () between the pressure chamber () and the volume reservoir (). A non-return valve () having a closure part () for blocking a channel () which opens a volume reservoir () into a pressure chamber () in a camshaft adjustor (), wherein the non-return valve () is formed of a metal sheet and the closure part () is realized so as to be movable in a recess () of the metal sheet () with two oppositely situated ends () which are bent toward each other.

Camshaft adjuster having a non-return valve

A camshaft adjuster () for a camshaft () of an internal combustion engine (). The camshaft adjuster () includes a stator (), a rotor () housed concentrically in the stator () and mounted rotatably about a rotational axis () relative to the stator (), and a volume accumulator () for receiving a hydraulic fluid from a pressure chamber () formed between the rotor () and the stator (). The volume accumulator () has an outlet () in a direction of the rotational axis ().

Configuration of a tank connection in a camshaft adjuster with volume accumulator

A camshaft adjuster with a drive element, a driven element, and a pressure chamber formed between the drive element and the driven element for generating a relative rotation between the driven element and the drive element, and a volume accumulator that is arranged in the camshaft adjuster and supplies hydraulic medium via a channel from the volume accumulator to the pressure chamber if there is an under-pressure in the pressure chamber. The camshaft adjuster has a non-return valve with a closing part for closing an opening of the channel, the non-return valve allows a flow of hydraulic medium through the channel from the volume accumulator to the pressure chamber, and there is an elastically expandable component that projects into the channel and can be guided by the channel and is connected to the closing part and is provided for applying tension for pulling the closing part into the channel.

Non-return valve of a camshaft adjuster

A stator () for a camshaft adjuster (). The stator () has a ring-shaped outer part () for the concentric holding of a rotor () with vanes () that project in the axial direction and are arranged on the periphery around the rotor () and a segment () that projects inward in the radial direction from the ring-shaped outer part () for engaging between two vanes () of the rotor (), in order to form, together with the two vanes (), pressure chambers () of the camshaft adjuster (). Here, the segment () has a cavity () for holding a hydraulic fluid from the pressure chambers ().

A device () for variably adjusting the control times of gas exchange vales () of an internal combustion engine () having a hydraulic phase adjustment device () and at least one volume accumulator (), wherein the phase adjustment device () can be brought into driving connection with a crankshaft () and a camshaft () and at least one early adjustment chamber () and at least one late adjustment chamber () which can be supplied with pressure medium via pressure medium lines (), or from which pressure medium can be drained. A phase position of the camshaft () can be adjusted relative to the crankshaft () in the direction of early control times by supplying pressure medium to the early adjustment chamber () while simultaneously draining pressure medium from the late adjustment chamber (), wherein a phase position of the camshaft () can be adjusted relative to the crankshaft () in the direction of late control times by supplying pressure medium to the late adjustment chamber () while simultaneously draining pressure medium from the early adjustment chamber (), wherein pressure medium can be supplied to the volume accumulator(s) () during operation of the internal combustion engine ().

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Gerhardshofen, Germany

Jurgen Plate