Exhaust energy recovery and generator for use with an engine

US4694654A · kind A · utility

Assignee

• ISUZU MOTORS LIMITED · JP

Inventor

• Hideo Kawamura

Key dates

• Filing date: Oct 29, 1984
• Grant date: Sep 22, 1987
• Expiry date: Oct 29, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An engine is composed of an exhaust turbine rotatable by the exhaust energy of an exhaust gas discharged from the engine, a generator coupled to the exhaust turbine, and a motor drivable by the generator. The energy recovered from the exhaust gas by the exhaust turbine is fed back to an output shaft of the engine through the generator and the motor. The engine may have a second exhaust turbine located downstream of the first-mentioned exhaust turbine in an exhaust passage for driving an intake air compressor. The exhaust gas may be introduced directly into the second exhaust turbine by a bypass passage. In a generator device used with the engine, the generator includes a rotor shaft coupled coaxially with a turbine wheel shaft of the exhaust turbine. The turbine wheel, the wheel shaft, and the rotor shaft are constructed of ceramics preferably as an integral structure. The rotor shaft is rotatably supported by oil floating bearings. On the rotor shaft, there is mounted a magnet rotor of a rare earth metal kept in position by holder plates held against opposite axial ends of the magnet rotor. A carbon wire is coiled around the magnet rotor. Alternatively, a magnet housing is mounted…