Patent ID: 8500187

Claim:
In a hydraulic system for a vehicle, comprising: a hydraulic actuation device for moving one or more moveable components of the vehicle, the actuation device comprising a hydraulic pump with an associated drive means, a reservoir for hydraulic fluid as well as one or more hydraulic actuators connected to the pump through hydraulic hoses, the hydraulic actuators acting on the one or more moveable components and the pump being designed to supply pressurized hydraulic fluid to the one or more hydraulic actuators, and a pressure ripple reduction device for reducing pressure ripples in the hydraulic fluid originating from the hydraulic pump, the improvement wherein: said pressure ripple reduction device is provided in a pressure line between the pump and the one or more actuators, and comprises an expansion chamber having an inlet and an outlet, wherein the inlet and outlet are distanced from each other so as to define a flow path through the expansion chamber for the hydraulic fluid, and wherein the expansion chamber has a cross-sectional area and the outlet has a cross-sectional area, wherein a ratio between said cross-sectional areas is between 5 and 40000, and wherein the expansion chamber is integrally attached to a pump body of the pump.