E139 — Adaptive High-Precision DAP Pump

Patent family E139 describes an electrically driven pressure control and volume delivery unit based on a double-acting piston (DAP) with two differently sized effective areas and parallel high-flow switching valves — enabling high-precision, variably controllable pressure supply for a wide range of hydraulic consumers.

The E139 patent family describes an electrically driven pressure control and volume delivery unit based on the principle of a double-acting piston (DAP) with two differently sized effective areas. By combining parallel high-flow switching valves with adaptive area switching, the unit achieves high-precision, variably controllable pressure supply. The large effective area enables rapid pre-filling at low pressures, while the small effective area enables high-precision pressure metering at high pressures with reduced motor torque.

The E139 patent family comprises 6 granted patents in the jurisdictions EP (validated in DE, GB, and FR), JP, IN, KR, US, and CN. With its broad, application-independent protection formulation, E139 forms the universal pump basis of IP portfolio B1 and extends protection beyond vehicle brakes to electrohydraulic clutches, steering systems, active chassis systems, and industrial actuators.