Electro-Motive Diesel, Inc.

Gm Global Technolgoy Operations, Inc.

Randal K Albright

John R Zagone

Budhadeb Mahakul

Werner C Duerr

Frank M Graczyk

Kenneth M Sinko

Thomas J Kane

Chih L Liu

Brent Valesano

Rafiqul Islam

An optimized two-stroke internal combustion diesel engine, suitable for locomotive applications, has been developed to meet the EPA locomotive Tier 2 emission standards. To achieve a low emission target below the EPA Tier 2 standards for NO(5.5 g/bhp-hr) and particulates (0.2 g/bhp-hr), several innovative changes have been made to the engine. These changes include: a new piston bowl geometry; low oil consumption piston rings; optimized surface finish cylinder liner; optimized fuel injection camlobe; modified fuel injector nozzle; new efficient aftercooler; optimized oil separator; and optimized turbocharger.

Optimized low emission two-stroke internal combustion diesel engine

A diesel locomotive engine having a piston with a unique bowl geometry. The bowl is defined in part by a center portion having a partial spherical shape. A cone portion () is located adjacent the central portion. An annular toroidal surface () is connected to the cone portion () and is defined by a toroidal major diameter (Dtm) and a toroidal minor radius (Rtm). A crown rim () is connected to the annular toroidal surface () and to an upper flat rim face of a sidewall.

Low emission fuel efficient diesel locomotive engine including a piston having a toroidal surface

An improved diesel engine water pump includes three main features that aid in extending the maintenance-free life of the pump. The impeller shaft is carried by tapered roller shaft support bearings of which the impeller bearing has a floating outer race that is urged axially by a preload spring to provide a prescribed axial preload that maintains concentricity of the shaft with the axis and prolongs bearing life. An improved oil seal combines an oil slinger, a stationary deflector and a lip oil seal with a return passage to the engine to more effectively limit oil leakage from the pump. An improved water seal includes pressurized water jets fed from the pump volute that flush wear particles from the water seal surface and increase water seal life. Further details of these features are also disclosed.

Diesel engine water pump with improved oil control

An improved diesel engine water pump includes three main features that aid in extending the maintenance free life of the pump. The impeller shaft is carried by tapered roller shaft support bearings of which the impeller bearing has a floating outer race that is urged axially by a preload spring to provide a prescribed axial preload that maintains concentricity of the shaft with the axis and prolongs bearing life. An improved oil seal combines an oil slinger, a stationary deflector and a lip oil seal with a return passage to the engine to more effectively limit oil leakage from the pump. An improved water seal includes pressurized water jets fed from the pump volute that flush wear particles from the water seal surface and increase water seal life. Further details of these features are also disclosed.

Diesel engine water pump with thrust bearing preload

Diesel engine water pump with improved water seal

Growing community of inventors

Montgomery, IL, United States of America

Randal K Albright