Punch Powertrain Psa E-transmissions N. V.

Punch Powertrain N.v.

Peter Mark Smid

Roell Marie Van Druten

Mohammad Galab

Bert Johannes Cornelis Van Bakel

Stefan Hubertus Godelieve Van Raemdonck

A hydraulic system for a vehicle transmission with at least two friction elements, the system comprising a first hydraulic circuit comprising a pump for supplying hydraulic fluid to the first hydraulic circuit. A flow restriction may be provided in the first hydraulic circuit between an output of the pump and a sump for providing leakage of hydraulic fluid into the sump. Further, a second hydraulic circuit comprising a second pump may be arranged, wherein the hydraulic pressure in the first circuit is higher compared to the second circuit. A flow control element operated using hydraulic pressure from the first circuit may be arranged for controlling flow/pressure in the second circuit. Further, the hydraulic system may be arranged for generating a line pressure, wherein an actuator for engaging a park lock system may be connected to the first hydraulic circuit for enabling direct actuation by means of the line pressure.

Hydraulic system for a vehicle, a vehicle transmission, and method for operating a vehicle transmission

A hydraulic system for a multiple friction transmission, comprising: a first pressure relief valveregulable by means of a first pilot pressure; a normally-open drain valve, which is a directional valve switchable between an open state and a closed state by means of a second pilot pressure; at least one first pressure regulatorfor operating the drain valve by means of a first pilot pressure and a second pilot pressure, respectively; wherein in the event of detrimental hydraulic pressure build up, the second pilot pressure is dropped to open the drain valve, so as to relieve pressure through the drain line.

Growing community of inventors

Sint-Truiden, Belgium

Peter Mark Smid