Hydraulic camshaft adjuster and method for operating a hydraulic camshaft adjuster

Abstract

The invention relates to a hydraulic camshaft adjuster (1) for adjusting the adjustment time of a gas exchange valve of an internal combustion engine, which has a stator (2) which can rotate synchronously with the crankshaft of the internal combustion engine, and which has a Rotor (3) arranged torsionally, it can rotate synchronously with the camshaft, wherein a plurality of webs (6) are arranged on the stator (2), which connect the ring between the stator (2) and the rotor (3) The space (7) is divided into a plurality of pressure chambers (8), wherein the rotor (3) has a rotor hub (4) and a plurality of blades (5) extending radially outward from the rotor hub (3), which will The pressure chamber (8) is divided into two groups of working chambers (9, 10) with different directions of action capable of loading the pressure medium (19) flowing in or out of the pressure medium circulation, and also has a function for locking the rotor (3) in the center Central locking mechanism (11) in position, wherein the hydraulic camshaft adjuster (1) is partially closed at the end sides (20, 21) by covers (17, 18), wherein one of the covers (17, 18) A reservoir (14) for storing pressure medium (19) is constructed in it, wherein the cover (17, 18) has an overflow opening (23) through which the pressure medium (19) can flow from the hydraulic pressure in the axial direction The camshaft adjuster (1) overflows, and wherein the reservoir (14) is dimensioned relative to the overflow opening (23) in such a way that when the hydraulic camshaft adjuster (1) is stopped, the The reservoir (14) holds a pressure medium tank (25), which ensures the supply of pressure medium to the non-return valve (28) of the central locking mechanism (11) when the hydraulic camshaft adjuster (1) is activated. The invention also relates to a method for operating such a hydraulic camshaft adjuster ( 1 ).

Description

technical field [0001] The invention relates to a hydraulic camshaft adjuster and a method for operating a hydraulic camshaft adjuster. Background technique [0002] Hydraulic camshaft adjusters are used in internal combustion engines to adapt the load state of the internal combustion engine to increase the efficiency of the internal combustion engine. Numerous hydraulic camshaft adjusters which operate according to the vane principle are known from the prior art. These camshaft adjusters usually have, in their basic construction, a stator which can be driven by the crankshaft of the internal combustion engine and a rotor which is connected in a rotationally fixed manner to the camshaft of the internal combustion engine. An annular space is arranged between the stator and the rotor, and this annular space is divided into a plurality of working chambers by radially inwardly protruding protrusions connected to the stator in a rotationally fixed manner, and these working chamb...

AI Technical Summary

Problems solved by technology

[0005] However, the known solutions have the disadvantage that they are either very cumbersome and therefore relatively expensive, or that under certain (unfavorable) operating conditions it is not possible to ensure that the support chamber for adjusting the camshaft adjuster to the central position is adequately supply oil

The disadvantage is that the pressure medium stored in the reservoir during engine shutdown is limited to a certain fill level due to overflow on the adjusting magnet of the hydraulic camshaft adjuster

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