Stepless hydromechanical mechanism with multiple power-transmission paths, more particularly for motor vehicles

US5328418A · kind A · utility

Inventor

• Michael Meyerle · Meckenbeuren, DE

Key dates

• Filing date: Oct 14, 1993
• Grant date: Jul 12, 1994
• Expiry date: Oct 14, 2013

Classification

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

Abstract

Stepless hydromechanical mechanism with multiple power-transmission paths, more particularly for motor vehicles, having at least two switching ranges in which the stepless control of the mechanism is effected by a hydrostatic transmission, in which the specific requirements on the hydrostatic unit are reduced to a minimum. The hydrostatic power content is reduced. The parameters determining noise, efficiency and service life, i.e., hydrostatic pressure, hydrostatic speed, as well as the values of these components and their arrangement are brought into acceptable and technically feasible bounds. To this end, two summation planetary gearing mechanisms are provided in which the input shaft of the transmission is drivingly connected to a first hydrostatic unit and to a first inlet shaft of the first summation planetary gearing mechanisms, and a second hydrostatic unit is connected to a second inlet shaft of the first summation planetary gearing mechanism and to a first inlet shaft of the second summation planetary gearing mechanism.