Automatic transmission with a positive-displacement pump

US5852931A · kind A · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Michael Reichenmiller · Schwäbisch Gmünd, DE
• Gerald Rowe · Gettorf, DE
• Franz Lacher · Tegernheim, DE
• Wolf Schmid · Arnhem, NL

Key dates

• Filing date: Apr 7, 1997
• Grant date: Dec 29, 1998
• Expiry date: Apr 7, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H41/30
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An automatic transmission, in particular an infinitely variable automatic transmission for motor vehicles, contains a radial piston pump (1) for supplying a hydrodynamic converter (3), a lubricating device and control and actuating devices of the automatic transmission via a number of control conduits. Radially outside of its outlet valves, the radial piston pump (1) contains an annular chamber (22), which extends around the radial piston pump (1). The annular chamber (22) is embodied as a damping chamber and is mainly arranged in a recess (23) of the converter housing (2), and therefore almost completely outside of the pump housing (17). The annular chamber (22) is bordered by the recess (23) of the converter housing (2), the pump housing (17) and/or a separate pump cover (24). The annular chamber (22) is not symmetric and with its volume extends into the adjoining free spaces of the automatic transmission.