Filling of a volume accumulator in a camshaft adjuster

摘要

A directional valve (30) for controlling a hydraulic oil flow from a pressure port (34) via working chambers of a camshaft adjuster (4) to a tank port (58). The directional valve (30) includes an accumulator port (36) for conducting at least a part of the hydraulic oil flowing out of a working chamber into a volume accumulator (54) before said hydraulic oil flows out into the tank port (58), and the accumulator port (36) is connected via a passage (60) to the pressure port (34).

主权项

1. A camshaft adjuster including a directional control valve for controlling a hydraulic oil flow from a pressure port via working chambers of the camshaft adjuster to a tank port, comprising an accumulator port for conducting at least a part of the hydraulic oil flow out of one of the working chambers into a volume accumulator before said hydraulic oil flows out into the tank port, and the accumulator port and the pressure port are in direct, uninterrupted connection with each other via a passage, wherein the passage between the pressure port and the accumulator port is formed by an axial groove, wherein the axial groove is covered at least partially by a sleeve.