Patent ID: 6446435
Filing Date: 2002-09-10
Classification: B60T,F04B

Abstract:
A vehicle hydraulic brake system with a master cylinder, a wheel brake cylinder, and a multi-piston pump that has an even number of stepped pistons, an inlet check valve (78) disposed in each of the stepped pistons, an intake side of each inlet check valve is connected to the master cylinder through an annular chamber (76) and each of the stepped pistons include a displacement chamber (74) with an outlet check valve (80) connected on a pressure side of each of the outlet check valves which are connected to the wheel brake cylinder, an end of each of the stepped pistons oriented towards the displacement chamber (74) having a larger diameter than an end oriented towards the annular chamber (76) and a drive of the stepped pistons (68) of the multi-purpose pump (42) takes place in a phase-shifted manner.