Infinitely variable hydrostatic mechanical power shift gear with group shiftings

US5011463A · kind A · utility

Inventors

• Friedrich Jarchow · Essen, DE
• Peter Tenberge · Friedrichshafen, DE

Key dates

• Filing date: Sep 28, 1989
• Grant date: Apr 30, 1991
• Expiry date: Sep 28, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2037/0886
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The gear consists of a four-shaft epicyclic gear, of which one shaft forms the input shaft which is in connection via an infinitely variable hydrostatic gear with the second shaft and of which the two remaining shafts represent connecting shafts which, in an extreme position of the hydrostatic gear, have the same speeds and behave during adjustment of the hydrostatic gear into the other extreme position in such a way that one becomes constantly slower and the other constantly faster, and which alternately act on the output shaft via gears of a gear group with following group shiftings. What is special is that the group shiftings make possible a multiple utilization of the gears of the gear group and that preparatory shifts for changing the group shifting provide the synchronization of idling gear parts, and that each gear change itself takes place at synchronous speeds, free from load and without tractive force interruption. Such gears require only small hydrostatic gears, have a particularly large transmission control range and favorable efficiencies. Its use in motor vehicles results in fuel savings and a superior acceleration behavior.