Transmission device with power splitting

US8535190B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Roland Fischer · Trostberg, DE
• Michael Siber · Nusplingen, DE
• Robert Morrison · Tettnang, DE

Key dates

• Filing date: Feb 9, 2010
• Grant date: Sep 17, 2013
• Expiry date: Apr 1, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2200/0091
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A transmission with power branching, and the transmission, in a first drive range, transmits torque from the ring gear to a fixed wheel. In one branch, power is transmitted from a first to a second hydraulic unit which respectively operate as a pump and a motor. At one of the hydrostatic shafts, the mechanical and hydrostatic power are summed and transmitted to the drive output. In a second drive range, power coming from the planetary carrier is partially branched off to the ring gear and transmitted, via the gear wheels of the hydrostatic shaft, to the second hydraulic unit. From the second hydraulic unit, hydraulic power passes to the first hydraulic unit. In the process, the first hydraulic unit operates as a motor and the second hydraulic unit as a pump. From the second sun gear, power is transmitted to the double planetary gear and summed.