Patent · US Active

Device reducing drag loss in an automatic transmission

US10113635B2 · kind B2 · utility

0Cited by

0References

7Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Markus Herrmann · Scheidegg, DE
Thilo Schmidt · Meckenbeuren, DE
Gerhard Martin · Tettnang, DE
Ahmed Mouhcine · Friedrichshafen, DE
Rainer Grundler · Espasingen, DE
Dirk Winkler · Bad Waldsee, DE
Valentine Vincent · Friedrichshafen, DE

Key dates

Filing date	Jun 30, 2016
Grant date	Oct 30, 2018
Priority date	—
Expiry date	Feb 21, 2037

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H61/48
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A drag torque reduction device for an automatic transmission includes a hydraulic controller with a radiator. In one embodiment, the drag torque reduction device also includes a parallel connection of a pressure relief valve, a constant aperture and a temperature-dependent, switchable aperture positioned upstream of the radiator. In another embodiment, the drag torque reduction device includes an overflow cooling oil diversion with a temperature-dependent, switchable aperture and a pressure relief valve that is positioned upstream of the radiator.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.