Patent · US Expired

Vehicle transmission with progressive stepping

US6709356B2 · kind B2 · utility

9Cited by

5References

10Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Gerhard Führer · Friedrichshafen, DE
Hermann Lanz · Frickingen, DE
Roland Stauber · Friedrichshafen, DE
Marcus Raeder · Bermatingen, DE

Key dates

Filing date	Jul 11, 2002
Grant date	Mar 23, 2004
Priority date	—
Expiry date	Jul 11, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/19242
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

In a transmission (2) for a motor vehicle with a main transmission part (22) which possesses a plurality of gear steps and wherein, between each step a step-jump in the gear ratio is provided, and with a split transmission part (40) for the separation of the step-jumps of the gear steps of the main transmission part (22) and with an area group transmission part (10) for the extension of the over-all gear ratio of the gear steps of the main transmission part 22 with a slow and a rapid gear ratio area, the average gear step-jump of the upper gear steps is approximately at least 0.7% less than the geometric step-jump calculated theoretically from the total gear ratio.

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