Variator

US6840876B2 · kind B2 · utility

Assignee

• ZF Transmission Technologies, L.L.C. · US

Inventors

• Dietmar Illerhaus · Cincinnati, US
• Rudolf Kauffeldt · Bad Schussenried, DE
• Manfred Fischer · Leichlingen, DE
• Thomas Lindner · Pfullendorf, DE
• Dieter Blaser · Eriskirch, DE
• Andreas Salm · Bodolz, DE

Key dates

• Filing date: Jun 21, 2002
• Grant date: Jan 11, 2005
• Expiry date: Dec 21, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/0046
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A variator for ratio adjustment of a continuously variable chain drive transmission having one variator shaft (1) and one variator pulley (2) supported upon the variator shaft (1) and axially movable by pressurizing a variator pressure chamber (31). The variator shaft (1) has on one end an axial hole (10) through which the variator pressure chamber (31) and a second pressure chamber (8) can be loaded with pressure independent of each other. The pressure is supplied to the variator pressure chamber (31) via a first section (13) of the axial hole (10) and the pressure is supplied to the second pressure chamber (8) via a non-rotating pipe (7) and a second section (15) of the axial hole (10), the pipe (7) is situated within the first hole section (13). It is proposed that the pipe (7) has two axially adjacently disposed sealing rings (73) for reciprocal dynamic sealing of the pressure supplies to the variator pressure chamber (31) and to the second pressure chamber (8) and that the variator shaft (1) has a vent hole (9) discharging, on one side between the two sealing rings (73) and on the other side in a transmission inner space (94).