Gm Global Technolgoy Operations, Inc.

Electro-motive Diesel, Inc.

Werner C Duerr

John R Zagone

Randal K Albright

Thomas J Kane

Edward John Cryer

Vijaya Kumar

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

An engine cylinder liner includes inner and outer walls formed integral with a head seat rim and defining a coolant jacket for cooling the inner cylinder wall. Stiffening ribs are provided for strengthening the upper liner structure to withstand combustion forces between the liner and a cylinder head attached to the head seat rim. The stiffening ribs are generally triangular and extend from a low point on the outer wall upward and inward to connection with the inner wall adjacent stud bosses in the head seat rim. Thus, connection of the ribs with the inner wall is minimized and the free flow of coolant along the inner wall is maximized, thereby improving cooling of the cylinder wall and reducing wear and scuffing of the liner in service.

Coolant jacketed cylinder liner with stiffening ribs

The present invention relates to a supplementary lubrication system for an internal combustion engine operable to lubricate the engine and an accessory prior to engine start-up and to lubricate the accessory after engine shut-down. The supplementary lubrication system includes an oil source in fluid communication with a supplemental oil supply conduit, which branches to define two parallel conduits, a prelube branch and a postlube branch. Disposed within the prelube branch is a prelube one-way check valve and disposed within the postlube branch is a postlube one-way check valve. The prelube branch is in fluid communication with a first end of a two-directional pump and the postlube branch is in fluid communication with a second end of the two-directional pump. During prelubrication the two-directional pump operates in a first direction to draw oil through the prelube branch and to pump oil through a prelube conduit extending from the second end of the two-directional pump, to deliver oil to the engine and the accessory. During postlubrication the two-directional pump operates in a second direction to draw oil through the postlube branch and to pump oil through a postlube conduit extending from the first end of the two-directional pump to deliver oil to the accessory.

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Westchester, IL, United States of America

Werner C Duerr