12-speed gear box with a 2.times.3.times.2 construction

US6318211A · kind A · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Rudiger Nitzschke · Tettnang, DE
• Bernd Schepperle · Konstanz, DE

Key dates

• Filing date: May 15, 2000
• Grant date: Nov 20, 2001
• Expiry date: May 15, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19251
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

To obtain in a 12-speed transmission for utility vehicles in 2.times.3.times.2 construction moving a logical shift diagram by alternating shifting movements back and forth with a continuously increasing or decreasing gear sequence, the two gear steps of the front-mounted section (GV) are manually shifted alternate for each gear step of a pneumatically shifted main section (GR). The rear steps of the main section (GH) are activated pneumatically by activating devices (S1, S2, S3) when changing from one to the next gear step. The transition from the slow to fast step (L, S) of each gear step is automatically carried out pneumatically by the rear-mounted section (GP).